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Use of Selected Scavengers for the Determination of NF-TiO2 Reactive Oxygen Species during the Degradation of Microcystin-LR under Visible Light Irradiation. J. Mol. Catal. A Chem. Pub Date : 2016-12-15 Miguel Pelaez,Polycarpos Falaras,Vlassis Likodimos,Kevin O'Shea,Armah A de la Cruz,Patrick S M Dunlop,J Anthony Byrne,Dionysios D Dionysiou
Although UV-induced TiO2 photocatalysis involves the generation of several reactive oxygen species (ROS), the formation of hydroxyl radicals are generally associated with the degradation of persistent organic contaminants in water. In this study, a variety of radical scavengers were employed to discriminate the roles of different ROS during visible light activated (VLA) photocatalysis using nitrogen
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Interface structural effect of ruthenium-cerium oxide nanocomposite on its catalytic activity for selective oxidation of bioterpenes-derived p-cymene J. Mol. Catal. A Chem. Pub Date : 2016 Peter Ramashadi Makgwane, Suprakas Sinha Ray
An efficient catalyzed liquid-phase selective oxidation of p-cymene to tertiary cymene hydroperoxide (TCHP) and its derivative p-methylacetophenone (PMAP) was achieved over a nanostructured ruthenium-cerium oxide (Ru/CeO2) composite catalyst with remarkable activity using a green molecular oxygen oxidant. Both of the composite catalysts were prepared from CeO2 oxide with different particles sizes [i
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Gold nanoparticles on mesoporous Cerium-Tin mixed oxide for aerobic oxidation of benzyl alcohol J. Mol. Catal. A Chem. Pub Date : 2016 Chiranjit Santra, Malay Pramanik, Kyoko K. Bando, Sudip Maity, Biswajit Chowdhury
In the era of sustainable chemistry the development of nanocatalysis has drawn special attention. Here we report the preparation of nanocrystalline, mesoporous cerium-tin oxide solid solutions and tested for selective oxidation of benzyl alcohol, cinnamyl alcohol, 4-methylbenzyl alcohol, 2-octanol, and geraniol using molecular oxygen as an oxidant. Among different mesoporous supports with Ce/Sn compositions
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Applications of a novel nano magnetic catalyst in the synthesis of 1,8-dioxo-octahydroxanthene and dihydropyrano[2,3-c]pyrazole derivatives J. Mol. Catal. A Chem. Pub Date : 2016 Mohammad Ali Zolfigol, Roya Ayazi-Nasrabadi, Saeed Baghery, Vahid Khakyzadeh, Saeid Azizian
Imidazole-based ionic liquid-stabilized on silica coated Fe3O4 magnetic nano particles [nano-Fe3O4@SiO2@(CH2)3-Imidazole-SO3H]Cl as a novel heterogeneous acidic catalyst was designed, synthesized and fully characterized by FT-IR, thermo gravimetric analysis (TGA), differential thermal analysis (DTA), energy-dispersive x-ray spectroscopy (EDX), X-ray diffraction patterns (XRD), scanning electron microscopy
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Bis(pyrazolylmethyl)pyridine Zn(II) and Cu(II) complexes: Molecular structures and kinetic studies of ring-opening polymerization of ε-caprolactone J. Mol. Catal. A Chem. Pub Date : 2016 Mnqobi Zikode, Stephen O. Ojwach, Matthew P. Akerman
We report the synthesis, molecular structures and applications of bis(pyrazolylmethyl)pyridine Zn(II) and Cu(II) complexes in the ring-opening polymerization (ROP) of ε-carprolactone (ε-CL). Reactions of bis(3,5-dimethyl-pyrazol-1-ylmethyl)pyridine (L1) with the appropriate Zn(II) and Cu(II) carboxylates afforded the corresponding complexes; [Zn(L1)(C6H5COO)2] (1), [Zn(L1)(2-Br-C6H4COO)2] (2), [Cu(L1)(C6H5COO)2]
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Selective oxidation of olefins with aqueous hydrogen peroxide over phosphomolybdic acid functionalized knitting aryl network polymer J. Mol. Catal. A Chem. Pub Date : 2016 Xiaojing Song, Wanchun Zhu, Yan Yan, Hongcheng Gao, Wenxiu Gao, Wenxiang Zhang, Mingjun Jia
A phosphomolybdic acid (PMA)-based heterogeneous catalyst, denoted as PMA/KAP, was prepared by immobilizing PMA onto a knitting aryl network polymer (KAP) based on triphenylphosphine (PPh3). The catalytic property of PMA/KAP was investigated for the selective oxidation of olefins with aqueous hydrogen peroxide (H2O2) as oxidant. When using ethyl acetate (EAC) as reaction medium, PMA/KAP performs higher
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Mn-Schiff base modified MCM-41, SBA-15 and CMK-3 NMs as single-site heterogeneous catalysts: Alkene epoxidation with H2O2 incorporation J. Mol. Catal. A Chem. Pub Date : 2016 A. Mavrogiorgou, M. Baikousi, V. Costas, E. Mouzourakis, Y. Deligiannakis, M.A. Karakassides, M. Louloudi
The development of new functional catalytic materials prepared via appropriate chemical modification of mesoporous silica SBA-15, MCM-41 or carbon nanomaterials CMK-3, are presented. Their synthesis has been carried out via two synthetic approaches: (a) a two steps procedure which includes grafting of the Schiff base ligand 1,3-bis[3-aza-3-(1-methyl-3-oxobut-1-enyl)-prop-3-en-1-yl]-2-(4-hydroxy-phenyl)-1
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Comparison of supported TiO2 catalysts in the photocatalytic degradation of NOx J. Mol. Catal. A Chem. Pub Date : 2016 M.J. Hernández Rodríguez, E. Pulido Melián, O. González Díaz, J. Araña, M. Macías, A. González Orive, J.M. Doña Rodríguez
A comparison is made in this study of the effectiveness of various commercial catalysts in the oxidation of NOx by heterogeneous photocatalysis. The following catalysts were considered: Aeroxide TiO2 P25, Aeroxide TiO2 P90, Hombikat UV-100, Kronos vlp7000, CristalACTIV PC105, CristalACTIV PC500, Kemira 650 and Anatasa Aldrich. All catalysts were deposited by a dip-coating technique onto borosilicate
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Monodisperse and polydisperse platinum nanoclusters supported over TiO2 anatase as catalysts for catalytic oxidation of styrene J. Mol. Catal. A Chem. Pub Date : 2016 Mostafa Farrag
Very small platinum nanoclusters have been synthesized by reduction of H2PtCl6·6H2O salt with NaBH4 in the presence and absence of water-soluble l-cysteine ligand. The synthesized platinum clusters were supported over anatase titanium dioxide (TiO2) by 1% wt/wt. The spectroscopic properties of Ptn(l-Cys)m clusters were studied by UV–vis spectroscopy and Fourier transform infrared spectroscopy (FTIR)
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cis-Dihydroxylation of electron deficient olefins catalysed by an oxo-bridged diiron(III) complex with H2O2 J. Mol. Catal. A Chem. Pub Date : 2016 Ambica Kejriwal, Sachidulal Biswas, Achintesh N. Biswas, Pinaki Bandyopadhyay
Room temperature oxidation of olefins catalysed by a symmetrical (μ-oxo)(μ-hydroxo)diiron(III) complex (1) based on the amino pyridyl ligand bpmen (bpmen = N,N′-dimethyl-N,N′-bis(2-pyridyl methyl)ethane-1,2-diamine) with hydrogen peroxide under the conditions of limiting substrate is described. Excellent substrate conversions have been achieved under ambient reaction conditions. The olefin oxidation
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Selective hydrogenation of benzene to cyclohexene over Ru–Zn/ZrO2 catalysts prepared by a two-step impregnation method J. Mol. Catal. A Chem. Pub Date : 2016 Xuhua Yan, Qi Zhang, Mingqiao Zhu, Zhengbao Wang
Supported Ru–Zn/ZrO2 catalysts are successfully prepared by a two-step impregnation method (Zn deposition–calcination–Ru deposition), and their catalytic performances for selective liquid-phase hydrogenation of benzene are investigated. Physical properties of the catalysts are characterized by N2 adsorption, atomic absorption spectroscopy, X-ray diffraction, temperature-programmed reduction, transmission
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Unexpected cleavage of ether bonds of 1,3-dimethoxypropane in Grignard–Wurtz synthesis of a MgCl2–donor adduct J. Mol. Catal. A Chem. Pub Date : 2016 Ville Nissinen, Sami Pirinen, Tuula T. Pakkanen
Diethers are an important group of electron donors in Ziegler–Natta catalysts. A simple diether, 1,3-dimethoxypropane was studied as an electron donor in Grignard–Wurtz synthesis of a MgCl2–donor adduct. 1,3-Dimethoxypropane was unexpectedly found to undergo a cleavage reaction during the synthesis producing methoxy groups (OCH3). Each mole of 1,3-dimethoxypropane produced approximately 2 moles of
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Catalytic oxidation of 2,4,6-tribromophenol using iron(III) complexes with imidazole, pyrazole, triazine and pyridine ligands J. Mol. Catal. A Chem. Pub Date : 2016 Mami Igarashi, Qianqian Zhu, Masahide Sasaki, Ritsu Kodama, Kohki Oda, Masami Fukushima
Five types of non-heme iron complexes, coordinated with imidazole, pyrazole, triazine and pyridine ligands, which had been previously synthesized, were used in the following studies. Among these complexes, the mer-[FeCl3(terpy)] complex showed the highest catalytic activity for the oxidative degradation of 2,4,6-tribromophenol (TrBP) using KHSO5 as an oxygen donor. The turnover numbers for the degradation
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Preparation of un-promoted molybdenum HDS catalysts supported on titania by equilibrium deposition filtration: Optimization of the preparative parameters and investigation of the promoting action of titania J. Mol. Catal. A Chem. Pub Date : 2016 Panagiotis Platanitis, George D. Panagiotou, Kyriakos Bourikas, Christos Kordulis, Jose L.G. Fierro, Alexis Lycourghiotis
The present work deals with un-promoted molybdenum hydrodesulphurization (HDS) catalysts supported on titania (anatase) which have been prepared by “Equilibrium Deposition Filtration” (EDF). The catalysts were characterized using various techniques (XRD, N2 adsoption–desorption isotherms, TPR, DRS and XPS) and evaluated at various temperatures and atmospheric pressure in a fixed bed differential reactor
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Nickel nanoparticles supported on graphene as catalysts for aldehyde hydrosilylation J. Mol. Catal. A Chem. Pub Date : 2016 Juan F. Blandez, Iván Esteve-Adell, Ana Primo, Mercedes Alvaro, Hermenegildo García
Nickel nanoparticles (NPs) supported on different undoped or doped with N or B graphenes (Gs) have been tested as catalyst for the hydrosilylation of aldehydes to obtain the corresponding siloxanes with high conversion and good selectivity in short reaction time. The different Gs employed were obtained by pyrolysis under inert atmosphere of alginate or chitosan, modified or not with boric acid. Then
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Facile synthesis of [urea-Zn]I2 eutectic-based ionic liquid for efficient conversion of carbon dioxide to cyclic carbonates J. Mol. Catal. A Chem. Pub Date : 2016 Mengshuai Liu, Xin Li, Xiaoli Lin, Lin Liang, Xiangxiang Gao, Jianmin Sun
Several environmentally benign eutectic-based ionic liquids (ILs) were developed as novel homogeneous catalysts for efficient conversion of carbon dioxide to cyclic carbonates. Propylene oxide (PO) was selected as a benchmark substrate to optimize the catalytic activity, and on account of the catalytic cooperativity between the cation and anion in the [urea-Zn]I2 catalyst, excellent yield (95%) and
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Functionalized montmorillonite supported rhodium complexes: Efficient catalysts for carbonylation of methanol J. Mol. Catal. A Chem. Pub Date : 2016 Pallab Kumar Saikia, Podma Pollov Sarmah, Bibek Jyoti Borah, Lakshi Saikia, Dipak Kumar Dutta
The catalyst precursors, [Rh(CO)2Cl-ligand(L)-APTMS-montmorillonite] (1a and 1b, where, a and b correspond to ligand (L)-APTMS-montmorillonite for ligands L = Quinoline-2-carboxylic acid (L1) and Quinoline-8-carboxylic acid (L2) respectively; APTMS = (3-aminopropyl)-trimethoxysilane), have been synthesised. The montmorillonite was activated by treating with formic acid under controlled condition to
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Isotopic transient kinetic study of N2O decomposition on LaMnO3 + δ J. Mol. Catal. A Chem. Pub Date : 2016 D.V. Ivanov, L.G. Pinaeva, E.M. Sadovskaya, L.A. Isupova
Analysis of label oxygen transfer during the reaction of N2O decomposition (18O2/N216O) on LaMnO3 + δ indicated that 16O transfer from N216O to 16O2 preceded faster compared to oxygen exchange 18O2/16O2 and involved the interaction with two lattice oxygen of perovskite. It suggests that surface oxygen vacancies play an important role in reactivity of LaMnO3 and explains why at times correlation can
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Quantitative structure–property relationships in propene polymerization by zirconocenes with a rac-SiMe2[Ind]2 based ligand framework J. Mol. Catal. A Chem. Pub Date : 2016 Mikhail S. Kuklin, Ville Virkkunen, Pascal M. Castro, Vyatcheslav V. Izmer, Dmitry S. Kononovich, Alexander Z. Voskoboynikov, Mikko Linnolahti
Quantitative structure–property relationships in group 4 metallocene olefin polymerization catalysts were constructed for a dataset of 8 zirconocenes in a combined experimental and quantum chemical study. A total of 45 descriptors measuring the steric and electronic influence of the rac-SiMe2[Ind]2 based ligand framework were correlated with the observed polymerization activities, together with the
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Promising nanostructured gold/metal oxide catalysts for oxidative coupling of benzylamines under eco-friendly conditions J. Mol. Catal. A Chem. Pub Date : 2016 Putla Sudarsanam, Baithy Mallesham, Agolu Rangaswamy, Bolla Govinda Rao, Suresh K. Bhargava, Benjaram M. Reddy
Designing Au nanocatalysts supported on nanosized metal oxides has drawn much attention due to remarkable nanoscale influenced metal-support interactions and their favorable role in heterogeneous catalysis. This work reports development of Au nanocatalysts dispersed on nanosized CeO2 and CeO2-ZrO2 supports for solvent- and base-free oxidative coupling of benzylamines into N-benzylbenzaldimines using
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Valence tautomerism induced nucleophilic ipso substitution in a coordinated tetrabromocatecholate ligand and diverse catalytic activity mimicking the function of phenoxazinone synthase J. Mol. Catal. A Chem. Pub Date : 2016 Anangamohan Panja, Narayan Ch. Jana, Moumita Patra, Paula Brandão, Curtis E. Moore, David M. Eichhorn, Antonio Frontera
Two new manganese(III) complexes, [pyH][Mn(Br4Cat)2(py)] (1) and [Mn(Br4Cat)(Br3pyCat)(py)2] (2), where py is pyridine, Br4CatH2 is tetrabromocatechol and Br3pyCatH2 is 3,5,6-tribromo-4-pyridiniumcatechol, derived from redox ‘noninnocent’ bromo-substituted catecholate ligands are reported. Both complexes were characterized by various spectroscopic techniques in addition to the single crystal X-ray
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Photo-catalytic selectivity of anthranilic acid over iron oxide incorporated titania nanoparticles: Influence of the Fe2+/Fe3+ ratio of iron oxide J. Mol. Catal. A Chem. Pub Date : 2016 Ya-Hui Chang, Chun-Chang Ou, Hui-Wen Yeh, Chung-Sung Yang
Iron oxide incorporated titania nanoparticles (FIT) with various atomic ratios of Fe/Ti, i.e. 3.53% (FIT-1), 8.3% (FIT-2), and 20.79% (FIT-3), are prepared to monitor the selectivity of photo-degradation for anthranilic acid (AA) in molecular level. In the FIT-1 route, the products obtained from the photo-degradation of AA are aniline, 4-aminophenol, and benzene. Since the surface of iron oxide domain
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An insight toward the photocatalytic activity of S doped 1-D TiO2 nanorods prepared via novel route: As promising platform for environmental leap J. Mol. Catal. A Chem. Pub Date : 2016 Shahzad Abu Bakar, Caue Ribeiro
The photocatalytic applications of the S-doped titanium dioxide (TiO2) are of great importance due to photon-to-carrier conversion ability of S-doping in the energy region below the band gap of pure TiO2. Therefore, 1D (one dimensional) S-doped TiO2 anatase nanorods were synthesized first time by facile, low temperature and template free oxidant peroxide method (OPM). The addition of thiourea as sulfur
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Main-chain NHC-palladium polymers based on adamantane: Synthesis and application in Suzuki–Miyaura reactions J. Mol. Catal. A Chem. Pub Date : 2016 Wu Xia, Longsheng Huang, Xue Huang, Yiming Wang, Cuifen Lu, Guichun Yang, Zuxing Chen, Junqi Nie
An adamantane-based bis-NHC-palladium polymer was synthesized and characterized by FT-IR, solid state 13C NMR, element analysis, TGA, XRD, SEM, TEM and N2 sorption. And then it was employed as heterogeneous palladium catalyst in the Suzuki–Miyaura coupling reactions of aryl halides and benzoboric acids, giving the products in moderate to excellent yields. Compared with the homogeneous catalyst such
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Influence of the preparation route on the basicity of La-containing mixed oxides obtained from LDH precursors J. Mol. Catal. A Chem. Pub Date : 2016 Iuliana Cota, Eliana Ramírez, Francisco Medina, Géraldine Layrac, Didier Tichit, Corine Gérardin
A series of La-containing Mg(Al)O mixed oxide catalysts were obtained from layered double hydroxide (LDH) precursors following different La3+ incorporation methods, i.e., coprecipitation, impregnation and intercalation. Structural and textural properties investigated by XRD and N2 physisorption revealed a large range of specific surface areas of the materials and different ordering of the structures
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Pinacol coupling of benzaldehydes mediated by titanium complexes displaying amine bis(phenolate) ligands J. Mol. Catal. A Chem. Pub Date : 2016 Sónia Barroso, Pedro Adão, Ana M. Coelho, João Costa Pessoa, Ana M. Martins
Titanium amine bis(phenolate) complexes of general formulas [Ti(L)Cl(THF)], [Ti(L)X2] and [{Ti(L)Cl}2-μ-O] (X = Cl, OiPr) were assessed as catalysts of PhCHO pinacol coupling. In optimal conditions (7.5 mol% catalyst load, 55 °C and 16 h of reaction time in THF) and TMSCl as additive, [Ti(L3)Cl2] (11) is the most efficient catalyst giving 100% conversion and 95% yield in diol with a ratio DL:meso = 57:43
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The isopropylation of biphenyl over transition metal substituted aluminophosphates: MAPO-5 (M: Co and Ni) J. Mol. Catal. A Chem. Pub Date : 2016 Hui Xing Zhang, Anand Chokkalingam, Priya V. Subramaniam, Stalin Joseph, Seiji Takeuchi, Ming Deng Wei, Abdullah M. Al-Enizi, Hoi-Gu Jang, Jong-Ho Kim, Gon Seo, Kenichi Komura, Yoshihiro Sugi, Ajayan Vinu
The isopropylation of biphenyl (BP) was examined over transition metal substituted aluminophosphates (MAPO-5; M: Co and Ni) with 12-membered (12-MR) oxygen ring pore-entrances of AFI topology. The MAPO-5 samples were synthesized by dry gel conversion method using trimethylamine as a structure directing agent, and their properties were characterized by XRD, XPS, SEM, N2 adsorption, NH3-TPD, pyridine
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Evaluation of catalytic activity of [RuClCp(dmoPTA)(PPh3)](OSO2CF3) in the isomerization of allylic alcohols in water (dmoPTA = 3,7-dimethyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane) J. Mol. Catal. A Chem. Pub Date : 2016 Adrian Mena-Cruz, Manuel Serrano-Ruiz, Pablo Lorenzo-Luis, Antonio Romerosa, Ágnes Kathó, Ferenc Joó, Luis Manuel Aguilera-Sáez
The catalytic activity of [RuClCp(HdmoPTA)(PPh3)](OSO2CF3) (1) and the dimeric complexes [RuClCp(PPh3)-μ-dmoPTA-1κP:2κ2N,N'-MCl2] (M = Ni (2), Co (3), Zn (4)) for the isomerization in water under Ar and ambient atmosphere of 1-octen-3-ol, 1-hepten-3-ol and 1-hexen-3-ol was investigated. A detailed study was devoted to the catalytic activity under Ar of 1 for the isomerization of 1-octen-3-ol.
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Catalytic asymmetric cycloaddition of CO2 to epoxides via chiral bifunctional ionic liquids J. Mol. Catal. A Chem. Pub Date : 2016 Shuhui Duan, Xinyao Jing, Dandan Li, Huanwang Jing
A series of new chiral ionic liquid catalysts composed of the N,N'-bis(salicyclidene) cyclohexene diaminatocobalt and an imidazolium salt were designed, prepared and applied for the chiral cyclic carbonate synthesis from racemic epoxides and carbon dioxide. All reactions exhibit good enantioselectivity for the chiral cyclic carbonate without polycarbonate and other by-products. The order of The order
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Heterostructured RGO/Bi3.64Mo0.36O6.55 nanospheres: Synthesis and enhanced visible-light-driven photocatalytic activity J. Mol. Catal. A Chem. Pub Date : 2016 Xue Lin, Siyu Yu, Zhuoyang Gao, Xiaoxu Zhang, Guangbo Che
Heterostructured RGO/Bi3.64Mo0.36O6.55 nanospheres with different weight fractions of RGO were synthesized via a simple and practical low-temperature solution-phase route by using Bi3.64Mo0.36O6.55 nanospheres as substrate materials. The as-prepared RGO/Bi3.64Mo0.36O6.55 nanoheterostructure included RGO nanoparticles assembling on the surface of Bi3.64Mo0.36O6.55 nanospheres. Comparing with pure Bi3
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Catalytic oxidation of methylene blue by dendrimer encapsulated silver and gold nanoparticles J. Mol. Catal. A Chem. Pub Date : 2016 Ali K. Ilunga, Reinout Meijboom
The catalytic oxidation of methylene blue was investigated in the presence of dendrimer generation five terminated NH2 encapsulated silver (AgDENs), and gold (AuDENs) nanoparticles as catalyst. The synthesis process of encapsulated metal nanoparticles were monitored by UV/vis spectrophotometry and their average diameters determined by transmission electron microscopy analysis, respectively. The kinetics
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Silver supported on hierarchically porous SiO2 and Co3O4 monoliths: Efficient heterogeneous catalyst for oxidation of cyclohexene J. Mol. Catal. A Chem. Pub Date : 2016 Yasemin Hakat, Trupti V. Kotbagi, Martin G. Bakker
This study describes silver (Ag) nanoparticles supported on hierarchically porous SiO2 and Co3O4 monoliths and the use of these materials as heterogeneous catalysts for the oxidation of cyclohexene. Structural characterization of these materials was carried out by various techniques including scanning electron microscopy (SEM), N2 adsorption, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy
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Simple green dehydration in biphasic medium: Application to the synthesis of phenylacetaldehyde J. Mol. Catal. A Chem. Pub Date : 2016 Sarah Le Guenic, Claire Ceballos, Christophe Len
A highly efficient, simple and versatile acid catalyst is proposed for the selective acid dehydration of 1-phenylethan-1,2-diol to phenylacetaldehyde in water-CPME biphasic media under microwave irradiation. A high stability and recyclability of the catalyst is also observed under the investigated conditions.
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Kinetic investigation on liquid–liquid–solid phase transfer catalyzed synthesis of dibenzyl disulfide with H2S-laden monoethanolamine J. Mol. Catal. A Chem. Pub Date : 2016 Gaurav Singh, Priya G. Nakade, Pratik Mishra, Preeti Jha, Sujit Sen, Ujjal Mondal
An investigation has been done on the utilization of H2S for the synthesis of dibenzyl disulfide (DBDS) using Amberlite IR-400 as a phase transfer catalyst. This involves absorption of H2S in aqueous monoethanolamine (MEA) followed by reaction of this H2S-laden MEA with organic reactant benzyl chloride (BC) to yield DBDS under liquid–liquid–solid (L–L–S) phase transfer catalysis condition. The effect
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Highly efficient Au hollow nanosphere catalyzed chemo-selective oxidation of alcohols J. Mol. Catal. A Chem. Pub Date : 2016 Manickam Sasidharan, Sundaramurthy Anandhakumar, Piyali Bhanja, Asim Bhaumik
Micelles of poly(styrene-b-2-vinyl pyridine-b-ethylene oxide) (PS-PVP-PEO) with core–shell–corona structures have been used as a scaffold for the fabrication of gold (Au) hollow nanospheres of particle size 26 ± 2 nm using HAuCl4 and NaBH4 as metal precursor and reducing agent, respectively. The PS core acts as a template for hollow void, the PVP shell serves as reaction sites for inorganic precursors
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Effective conversion of heteroatomic model compounds in microalgae-based bio-oils to hydrocarbons over β-Mo2C/CNTs catalyst J. Mol. Catal. A Chem. Pub Date : 2016 Junmei Liang, Ranran Ding, Yulong Wu, Yu Chen, Kejing Wu, Yongqiang Meng, Mingde Yang, Yaowu Wang
Hydrotreatment of heteroatomic model compounds in microalgae-based bio-oils into diesel-like hydrocarbons was carried out over carbon nanotubes (CNTs)-supported β-Mo2C catalyst with superior activity and selectivity under a mild condition (≤200 °C). The results show that stearic acid and hexadecanamide can be completely converted into n-C15–C18 alkanes over β-Mo2C/CNTs catalyst. The β-Mo2C/CNTs favors
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Weakly distorted 8-quinolinolato iron(III) complexes as effective catalysts for oxygenation of organic compounds by hydrogen peroxide J. Mol. Catal. A Chem. Pub Date : 2016 Yongjun Wang, Xu Wen, Chunying Rong, Senpei Tang, Wenfeng Wu, Chao Zhang, Yachun Liu, Zaihui Fu
This paper first discloses that two heteroleptic 8-quinolinolato iron(III) complexes (Qa1Qb2FeIII, Qa2Qb1FeIII) could be synthesized conveniently via the coordination of FeCl2·6H2O with 2 equivalents of 5,7-dichloro-8-hydroxyquinoline (Qb) or 5-chloro-8-hydroxyquinoline (Qa) under N2 and then 1 equivalent of Qa or Qb under air. In comparison with the two homoleptic counterparts (Qa3FeIII and Qb3FeIII)
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Sulfonated porous organic polymer as a highly efficient catalyst for the synthesis of biodiesel at room temperature J. Mol. Catal. A Chem. Pub Date : 2016 Ruth Gomes, Piyali Bhanja, Asim Bhaumik
A new functionalized porous organic polymer bearing sulfonic acid groups (PDVTA-SO3H) at the pore surface with high surface area (SBET = 406 m2 g−1) and Brønsted acidity is reported. The material has been synthesized via post-synthetic sulfonation of the porous co-polymer poly-divinylbenzene-co-triallylamine (PDVTA-1) using chlorosulfonic acid as sulfonating agent. A detailed characterization of the
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Low-temperature oxidation of methane on Pd-Sn/ZrO2 catalysts J. Mol. Catal. A Chem. Pub Date : 2016 Juan J. Lovón-Quintana, João B.O. Santos, Adriana S.P. Lovón, Nathália La-Salvia, Gustavo P. Valença
Pd/ZrO2, Pd-Sn/ZrO2 and Sn/ZrO2 were prepared by incipient wetness using Pd(NO3)2·XH2O and SnC4H4O6·XH2O as precursors, dried and calcined in static air at 500 °C, 800 °C or 1100 °C. The influence of Sn species in the oxygen storage capacity of the catalysts, distribution of Pd particle sizes and CH4 oxidation reaction were investigated. Pd particle size was larger on Sn-containing catalysts and showed
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Efficient one-pot microwave-assisted hydrothermal synthesis of M (M = Cr, Ni, Cu, Nb) and nitrogen co-doped TiO2 for hydrogen production by photocatalytic water splitting J. Mol. Catal. A Chem. Pub Date : 2016 Hsin-yu Lin, Cheng-yao Shih
A series of metal ion (M = Cr, Ni, Cu, Nb) and nitrogen co-doped TiO2 with high hydrogen production by photocatalytic water splitting were prepared by microwave-assisted hydrothermal method using titanium sulfate as precursor in the presence of urea. The catalysts were characterized by powder X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), X-ray photoelectron spectroscopy analysis
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Surface and catalytic properties of triflic acid supported zirconia: Effect of zirconia tetragonal phase J. Mol. Catal. A Chem. Pub Date : 2016 Hatem M. Altass, Abd El Rahman S. Khder
In this paper, trifluoromethanesulfonic acid was successfully loaded over calcined crystalline zirconia. Zirconia was calcined at 200, 350, 500, 700 and 900 °C before trifluoromethanesulfonic acid was loaded. The catalysts were characterized by various sophisticated techniques such as FTIR, SEM, TEM, XRD and N2 adsorption–desorption measurements. The acidic behavior of the catalysts has been studied
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Nd3+-doped TiO2 nanoparticles incorporated with heteropoly phosphotungstic acid: A novel solar photocatalyst for degradation of 4-chlorophenol in water J. Mol. Catal. A Chem. Pub Date : 2016 Jesty Thomas, S. Radhika, Minjoong Yoon
Different Nd3+-doped TiO2 nanoparticles incorporated with heteropoly phosphotungstic acid (HPA) (Nd3+-TiO2-HPA nanocomposites) were synthesized, and their structure and optical properties were characterized. UV–vis diffuse reflectance spectra of Nd3+-TiO2-HPA nanocomposites supported that the nanocomposites absorb visible light as well as ultra violet light. Consequently they exhibit efficient photocatalytic
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Carbon covered Mg–Al hydrotalcite supported nanosized Ru catalysts for ammonia synthesis J. Mol. Catal. A Chem. Pub Date : 2016 Katabathini Narasimharao, Podila Seetharamulu, K.S. Rama Rao, Sulaiman N. Basahel
Carbon covered hydrotalcite (CCHT) supported Ru catalysts with single (Cs or Ba) and double (Cs and Ba) promoters were prepared by two different methods viz., impregnation (IMP) and polyol reduction (PR) methods using ethylene glycol as solvent. The performance of the catalysts for ammonia synthesis was carried out in the temperature range of 523–698 K at atmospheric pressure. The following sequence
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Preparation, characterization and enhanced photocatalytic activities of zinc oxide nano rods/silicon carbide composite under UV and visible light irradiations J. Mol. Catal. A Chem. Pub Date : 2016 Meenakshi G., Sivasamy A., Suganya Josephine G.A., Kavithaa S.
ZnO/SiC nanocomposites were fabricated by a simple sol-gel process for exhibiting an enhanced photocatalytic activity under UV and visible light irradiation. The prepared photocatalysts were characterized by XRD, UV-DRS, FT-IR, AFM, FE-SEM, EDAX, HR-TEM, SAED, XPS and EPR analysis. XRD and FE-SEM showed that the prepared photocatalysts were nanocrystalline. Band gap energies of synthesized ZnO/SiC
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Highly efficient photocatalytic activities, band alignment of BiVO4/BiOCl {001} prepared by in situ chemical transformation J. Mol. Catal. A Chem. Pub Date : 2016 Lianwei Shan, Yuteng Liu, Jagadeesh Suriyaprakash, Chengguo Ma, Ze Wu, Limin Dong, Lizhu Liu
The proper band alignment of coupled semiconductor plays a key role on enhancing photocatalytic activity due to the valence and conduction difference in the interface to drive the photogenerated charge carrier separation. However, little is known about the exact band alignment of coupled semiconductors due to that most band alignments were schematic by valence of monocomponent, but not consider the
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The effect of Al2O3 and ionic liquids in palladium catalyzed arylation of cyclohexene. Interaction of Hg(0) with immobilized palladium J. Mol. Catal. A Chem. Pub Date : 2016 A. Wirwis, W. Gil, J. Pernak, A.M. Trzeciak
Three-component systems containing Pd(OAc)2, Al2O3, and an IL (IL = ionic liquid) were applied in the Heck arylation of cyclohexene. The highest productivity and selectivity to 4-phenylcyclohexene was noted in reaction catalyzed by Pd/Al2O3 in the presence of a small amount of an IL, dimethyldidodecylammonium lactate (C). The addition of Al2O3 alone to the reaction catalyzed by soluble precursors,
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Novel access to N,N′-diaryl-trans-1,2-diaminocyclohexane ligands. A cheap and easy way to prepare ligand for asymmetric transfer hydrogenation J. Mol. Catal. A Chem. Pub Date : 2016 Bilal El-Asaad, Boris Guicheret, Estelle Métay, Iyad Karamé, Marc Lemaire
N,N′-diaryl-trans-1,2-diaminocyclohexane ligands were prepared from 1,2-diaminocyclohexane and cyclohexanone derivatives via a heterogeneous palladium catalysis. In one step an alkylation followed by an aromatisation is performed under air or in the presence of an hydrogen trap. The interest of the synthesized ligands were evaluated in the reduction of aromatic ketones. The alcohols were efficiently
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Hydrothermal synthesis of SnO2/ZnS nanocomposite as a photocatalyst for degradation of Rhodamine B under simulated and natural sunlight J. Mol. Catal. A Chem. Pub Date : 2016 Longxing Hu, Feiyan Chen, Pengfei Hu, Lianpei Zou, Xing Hu
A novel nanocomposite, SnO2/ZnS, was successfully synthesized via a one-step hydrothermal method. The composite was characterized by several techniques such as XRD, SEM, TEM, XPS and UV–vis spectrum, and utilized for photocatalytic degradation of refractory dye Rhodamine B (RhB) under simulated and natural sunlight. It was found that the composite prepared at the molar ratio of n(SnCl4·5H2O)/n(Zn(NO3)2·6H2O) = 1
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Fabrication of hybrid mesoporous TiO2–SiO2(Et) supported Ni nanoparticles: An efficient and air/water stable catalyst J. Mol. Catal. A Chem. Pub Date : 2016 Wei Li, Haiyang Cheng, Weiwei Lin, Guanfeng Liang, Chao Zhang, Fengyu Zhao
We prepared a series of mesostructured Ni/TiO2–SiO2(Et) hybrid catalysts with highly dispersed Ni nanoparticles and incorporated ethane-bridged organosilica moieties. Ni/TiO2–SiO2(Et) showed high activity in the hydrogenation of nitrobenzene in water, and it could be recycled for several times with a constant activity and selectivity. It was confirmed that Ni/TiO2–SiO2(Et) catalyst is of hydrophobicity
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Enhanced photocatalytic activity of supported CuO–ZnO semiconductors towards the photodegradation of mefenamic acid aqueous solution as a semi real sample J. Mol. Catal. A Chem. Pub Date : 2016 Arezoo Shirzadi, Alireza Nezamzadeh-Ejhieh
The elimination mefenamic acid (MA) as a pollutant from the aquatic environment using Hg lamp during a catalytic photodegradation process using supported ZnO–CuO onto clinoptilolite nanoparticles (NCP) was the aim of the study. Raw and supported clinoptilolite were characterized by FT-IR, XRD, DRS, TEM and SEM techniques. The changes of MA concentration determined by UV–vis double beam spectrophotometer
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DABCO- and DBU-intercalated α-zirconium phosphate as latent thermal catalysts in the copolymerization of glycidyl phenyl ether (GPE) and hexahydro-4-methylphthalic anhydride (MHHPA) J. Mol. Catal. A Chem. Pub Date : 2016 Osamu Shimomura, Takatoshi Nishisako, Shunro Yamaguchi, Junko Ichihara, Manabu Kirino, Atsushi Ohtaka, Ryôki Nomura
The latent catalytic abilities of tertiary amines-intercalated α-zirconium phosphate [(α-ZrP·amine): 1,4-diazabicyclo[2,2,2]octane (α-ZrP·DABCO) and 1,8-diazabicyclo[5,4,0]undec-7-ene (α-ZrP·DBU)] were examined by copolymerization of glycidyl phenyl ether (GPE) and hexahydro-4-methylphthalic anhydride (MHHPA) at varying temperatures for 1 h periods. Polymerization was not observed until the reactants
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The application of a supported palladium catalyst for the hydrogenation of aromatic nitriles J. Mol. Catal. A Chem. Pub Date : 2016 Liam McMillan, Lauren F. Gilpin, Justin Baker, Colin Brennan, Alan Hall, David T. Lundie, David Lennon
The use of a Pd/C catalyst in the liquid phase hydrogenation of various aromatic nitriles (benzonitrile, benzyl cyanide, 3-phenyl propionitrile and cinnamonitrile) has been studied in order to assess the effectiveness of this type of catalyst for this class of reaction. On modifying the nitrile substituent and upon introducing conjugation, varying degrees of conversion are observed. For benzyl cyanide
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Preparation by sonophotodeposition method of bimetallic photocatalysts Pd–Cu/TiO2 for sustainable gaseous selective oxidation of methanol to methyl formate J. Mol. Catal. A Chem. Pub Date : 2016 Paweł Lisowski, Juan C. Colmenares, Dariusz Łomot, Olga Chernyayeva, Dmytro Lisovytskiy
It has been demonstrated that sonophotodeposition can be one choice as a green method to synthesize bimetallic supported photocatalysts with enhanced performance for selective oxidations. A series of Pd–Cu supported on Titania-P90 photocatalysts were successfully prepared using this innovative method of effective synergistic combination of sonication and light. In addition, our method does not require
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Novel iron and gallium salts of Aquivion® PFSA: Synthesis, characterization and some catalytic applications J. Mol. Catal. A Chem. Pub Date : 2016 Riccardo Tassini, Vikas D. Rathod, Stefano Paganelli, Eleonora Balliana, Oreste Piccolo
The objective of this study was to prepare, characterize and test the catalytic properties of iron and gallium salts of Aquivion® PFSA (hereinafter Aquivion-H). The samples were characterized by the determination of metal loading in fresh and used materials, ATR-FTIR, and thermogravimetric analysis (TG-DSC). The salts were screened in Friedel–Crafts acylation of some heterocyclic compounds and compared
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Efficient oxidation of phenol by persulfate using manganite as a catalyst J. Mol. Catal. A Chem. Pub Date : 2016 Yang Li, Lin-Dong Liu, Lu Liu, Ying Liu, Hong-Wei Zhang, Xu Han
In this study, three trivalent Mn (oxyhydr)oxides, bixbyite (α-Mn2O3), hausmannite (Mn3O4) and manganite (γ-MnOOH) were synthesized and used as persulfate (PS) activators in phenol oxidation. Of these three Mn (oxyhydr)oxides, only γ-MnOOH shows a good catalytic activity in PS activation with more than 80% phenol oxidized within 360 min in the full pH range. With increasing concentrations of PS and
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Effect of ligand derivatization at different positions on photochemical properties of hybrid Re(I) photocatalysts J. Mol. Catal. A Chem. Pub Date : 2016 Thomas G. Fenton, Michael E. Louis, Gonghu Li
Hybrid CO2-reduction photocatalysts based on Re(bpy)(CO)3Cl, where bpy is 2,2′-bipyridine, were synthesized in order to investigate the effect of different ligand derivatization strategies on photochemical properties of the hybrid Re(I) systems. Derivatization of the bpy ligand was carried out at the 4,4′- and 5,5′-positions with electron-withdrawing amide groups. The derivatized ligands were grafted