Abstract
In the present study, mono and bi-metallic catalysts containing Cr and Co were prepared by impregnating the hydrothermally prepared mesoporous KIT-6 support with 5–10 wt% total metal content. The well-ordered three-dimensional mesoporous structure of the KIT-6 support was confirmed by small angle X-ray diffraction (XRD) patterns. N2 adsorption-desorption analysis results showed that the mesoporous structure of KIT-6 was preserved after metal loading. Structural bonds of KIT-6 support and prepared catalysts were determined by Fourier-transform infrared (FT-IR) spectroscopy. The pyridine adsorbed diffuse reflectance FT-IR (DRIFT) spectroscopy results revealed the presence of Lewis acid sites on the surface of the catalysts. Activity experiments were carried out in a microwave-heated continuous-flow fixed bed reactor system at temperature range of 350–650 °C and feed ratios of Ethane/Argon: 1/2, 1/1, 2/1 with a gas hourly space velocity (GHSV) of 18,000 ml/h.gcat. The 5Cr@KIT-6 catalyst exhibited high ethane conversion (63.5%) while the highest ethylene/hydrogen ratio (0.98) was obtained with the 2.5Cr2.5Co@KIT-6 catalyst at 450 °C. It was concluded that high temperatures (above 450 °C) facilitate the formation of side reactions and the production of aromatic compounds. The high catalytic activities of mesoporous catalysts were thought to be due to hot spots in the microwave reactor system.
Funding source: Gazi Üniversitesi
Award Identifier / Grant number: 06/2019-02
Acknowledgments
The author thanks to the Central Laboratory of METU for the characterization results of the synthesized materials.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was financially supported by Gazi University Research Fund (Grant No. 06/2019-02).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
References
Ahn, S. J., G. N. Yun, A. Takagaki, R. Kikuchi, and S. T. Oyama. 2018. “Effects of Pressure, Contact Time, Permeance, and Selectivity in Membrane Reactors: The Case of the Dehydrogenation of Ethane.” Separation and Purification Technology 194: 197–206, https://doi.org/10.1016/j.seppur.2017.11.037.Search in Google Scholar
Alalwan, H. A., D. M. Cwiertny, and V. H. Grassian. 2017. “Co3O4 Nanoparticles as Oxygen Carriers for Chemical Looping Combustion: A Materials Characterization Approach to Understanding Oxygen Carrier Performance.” Chemical Engineering Journal 319: 279–87, https://doi.org/10.1016/j.cej.2017.02.134.Search in Google Scholar
Anandhi, J. T., S. L. Rayer, and T. Chithambarathanu. 2017. “Synthesis, FTIR Studies and Optical Properties of Aluminium Doped Chromium Oxide Nanoparticles by Microwave Irradiation at Different Concentrations.” Chemical and Materials Engineering 5 (2): 43, https://doi.org/10.13189/cme.2017.050204.Search in Google Scholar
Arbag, H. 2018. “Effect of Impregnation Sequence of Mg on Performance of Mesoporous Alumina Supported Ni Catalyst in Dry Reforming of Methane.” International Journal of Hydrogen Energy 43 (13): 6561–74, https://doi.org/10.1016/j.ijhydene.2018.02.063.Search in Google Scholar
Ausavasukhi, A., and T. Sooknoi. 2014. “Tunable Activity of [Ga]HZSM-5 with H2 Treatment: Ethane Dehydrogenation.” Catalysis Communications 45: 63–8, https://doi.org/10.1016/j.catcom.2013.10.026.Search in Google Scholar
Ayad, M. M., N. A. Salahuddin, A. A. El-nasr, and N. L. Torad. 2016. “Microporous and Mesoporous Materials Amine-functionalized Mesoporous Silica KIT-6 as a Controlled Release Drug Delivery Carrier.” Microporous and Mesoporous Materials 229: 166–77, https://doi.org/10.1016/j.micromeso.2016.04.029.Search in Google Scholar
Bai, X., S. Tiwari, B. Robinson, C. Killmer, L. Li, and J. Hu. 2018. “Microwave Catalytic Synthesis of Ammonia from Methane and Nitrogen.” Catalysis Science and Technology 8 (24): 6302–5, https://doi.org/10.1039/c8cy01355a.Search in Google Scholar
Bugrova, T. A., V. V. Dutov, V. A. Svetlichnyi, V. Cortés Corberán, and G. V. Mamontov. 2019. “Oxidative Dehydrogenation of Ethane with CO2 over CrOx Catalysts Supported on Al2O3, ZrO2, CeO2 and CexZr1-xO2.” Catalysis Today 333: 71–80, https://doi.org/10.1016/j.cattod.2018.04.047.Search in Google Scholar
Chen, S., X. Pan, C. Miao, H. Xie, G. Zhou, Z. Jiao, and X. Zhang. 2018. “Study of Catalytic Hydrodeoxygenation Performance for the Ni/KIT-6 Catalysts.” Journal of Saudi Chemical Society 22 (5): 614–27, https://doi.org/10.1016/j.jscs.2017.11.002.Search in Google Scholar
Chirra, S., S. Siliveri, A. Kumar, A. Srinath, G. Sripal, and R. Gujjula. 2019. “Pd – KIT – 6: Synthesis of a Novel Three – Dimensional Mesoporous Catalyst and Studies on its Enhanced Catalytic Applications.” Journal of Porous Materials 26: 1667–77.10.1007/s10934-019-00763-5Search in Google Scholar
Cychosz, K. A., and M. Thommes. 2018. “Progress in the Physisorption Characterization of Nanoporous Gas Storage Materials.” Engineering 4 (4): 559–66, https://doi.org/10.1016/j.eng.2018.06.001.Search in Google Scholar
Dangwal, S., R. Liu, and S. J. Kim. 2017. “High-temperature Ethane Dehydrogenation in Microporous Zeolite Membrane Reactor: Effect of Operating Conditions.” Chemical Engineering Journal 328: 862–72, https://doi.org/10.1016/j.cej.2017.07.108.Search in Google Scholar
Dragoi, B., A. Ungureanu, A. Chirieac, V. Hulea, S. Royer, and E. Dumitriu. 2013. “Enhancing the Performance of SBA-15-Supported Copper Catalysts by Chromium Addition for the Chemoselective Hydrogenation of Trans-cinnamaldehyde.” Catalysis Science and Technology 3 (9): 2319–29, https://doi.org/10.1039/c3cy00198a.Search in Google Scholar
Eslek Koyuncu, D. D. 2020. “Microwave-assisted Non-oxidative Ethane Dehydrogenation over Different Carbon Materials.” Diamond and Related Materials. in press.10.1016/j.diamond.2020.108130Search in Google Scholar
Fernandes, F. R. D., F. G. H. S. Pinto, E. L. F. Lima, L. D. Souza, V. P. S. Caldeira, and A. G. D. Santos. 2018. “Influence of Synthesis Parameters in Obtaining KIT-6 Mesoporous Material.” Applied Sciences 8 (5), https://doi.org/10.3390/app8050725.Search in Google Scholar
Gopinatha, S., and N. Nagarajanb. 2015. “Energy Based Reliable Multicast Routing Protocol for Packet Forwarding in MANET.” Journal of Applied Research and Technology 13: 374–81.10.1016/j.jart.2015.07.003Search in Google Scholar
Heracleous, E., and A. A. Lemonidou. 2006. “Reaction Pathways of Ethane Oxidative and Non-oxidative Dehydrogenation on γ-Al2O3 Studied by Temperature-programmed Reaction (TP-reaction).” Catalysis Today 112 (1–4): 23–7, https://doi.org/10.1016/j.cattod.2005.11.040.Search in Google Scholar
Huang, Y., X. Dong, Y. Yu, and M. Zhang. 2017. “Kinetic Monte Carlo Study of Vinyl Acetate Synthesis from Ethylene Acetoxylation on Pd(100) and Pd/Au(100).” Applied Surface Science 423: 793–9, https://doi.org/10.1016/j.apsusc.2017.06.228.Search in Google Scholar
Jan, O., and F. L. P. Resende. 2018. “Liquid Hydrocarbon Production via Ethylene Oligomerization over Ni-Hî’.” Fuel Processing Technology 179: 269–76, https://doi.org/10.1016/j.fuproc.2018.07.004.Search in Google Scholar
Ji, Z., H. Lv, X. Pan, and X. Bao. 2018. “Enhanced Ethylene Selectivity and Stability of Mo/ZSM5 upon Modification with Phosphorus in Ethane Dehydrogenation.” Journal of Catalysis 361: 94–104, https://doi.org/10.1016/j.jcat.2017.12.023.Search in Google Scholar
Jira, R. 2009. “Acetaldehyde from Ethylene – A Retrospective on the Discovery of the Wacker Process.” Angewandte Chemie – International Edition 48 (48): 9034–7, https://doi.org/10.1002/anie.200903992.Search in Google Scholar
Karthikeyan, G. G., G. Boopathi, A. Pandurangan, G. Boopathi, and A. Pandurangan. 2018. “Facile Synthesis of Mesoporous Carbon Spheres Using 3D Cubic Fe-KIT-6 by CVD Technique for the Application of Active Electrode Materials in Supercapacitors.” ACS Omega 3: 16658–71, https://doi.org/10.1021/acsomega.8b02160.Search in Google Scholar
Ke, C., Y. Zhang, Y. Gao, Y. Pan, B. Li, Y. Wang, and R. Ruan. 2019. “Syngas Production from Microwave-assisted Air Gasification of Biomass: Part 1 Model Development.” Renewable Energy 140: 772–8, https://doi.org/10.1016/j.renene.2019.03.025.Search in Google Scholar
Kim, D. K., C. Y. Cha, W. T. Lee, and J. H. Kim. 2001. “Microwave Dehydrogenation of Ethane to Ethylene.” Journal of Industrial and Engineering Chemistry 7 (6): 363–74.Search in Google Scholar
Kishor, R., and A. K. Ghoshal. 2017. “Understanding the Hydrothermal, Thermal, Mechanical and Hydrolytic Stability of Mesoporous KIT-6: A Comprehensive Study.” Microporous and Mesoporous Materials 242: 127–35, https://doi.org/10.1016/j.micromeso.2017.01.020.Search in Google Scholar
Kleitz, F., S. H. Choi, and R. Ryoo. 2003. “Cubic Ia3d Large Mesoporous Silica: Synthesis and Replication to Platinum Nanowires, Carbon Nanorods and Carbon Nanotubes.” Chemical Communications 9 (17): 2136–7, https://doi.org/10.1039/b306504a.Search in Google Scholar
Leth, K. T., A. K. Rovik, M. S. Holm, M. Brorson, H. J. Jakobsen, J. Skibsted, and C. H. Christensen. 2008. “Synthesis and Characterization of Conventional and Mesoporous Ga-MFI for Ethane Dehydrogenation.” Applied Catalysis A: General 348 (2): 257–65, https://doi.org/10.1016/j.apcata.2008.07.003.Search in Google Scholar
Li, B., X. Luo, J. Huang, X. Wang, and Z. Liang. 2017. “One – Pot Synthesis of Ordered Mesoporous Cu – KIT – 6 and its Improved Catalytic Behavior for the Epoxidation of Styrene : Effects of the pH Value of the Initial Gel.” Chinese Journal of Catalysis 38 (3): 518–28, https://doi.org/10.1016/S1872-2067(17)62767-0.Search in Google Scholar
Liu, H., S. Xu, G. Zhou, G. Huang, S. Huang, and K. Xiong. 2018a. CO2 Hydrogenation to Methane over Co/KIT-6 Catalyst : Effect of Reduction Temperature, https://doi.org/10.1016/j.cej.2018.06.087.351 65-73.Search in Google Scholar
Liu, J., P. He, L. Wang, H. Liu, Y. Cao, and H. Li. 2018b. “An Efficient and Stable Cu/SiO2 Catalyst for the Syntheses of Ethylene Glycol and Methanol via Chemoselective Hydrogenation of Ethylene Carbonate.” Chinese Journal of Catalysis 39 (8): 1283–93, https://doi.org/10.1016/S1872-2067(18)63032-3.Search in Google Scholar
Lu, X., H. Xu, J. Yan, W. J. Zhou, A. Liebens, and P. Wu. 2018. “One-pot Synthesis of Ethylene Glycol by Oxidative Hydration of Ethylene with Hydrogen Peroxide over Titanosilicate Catalysts.” Journal of Catalysis 358: 89–99, https://doi.org/10.1016/j.jcat.2017.12.002.Search in Google Scholar
Megia, P. J., A. Carrero, J. A. Calles, and A. J. Vizcaino. 2019. “Hydrogen Production from Steam Reforming of Acetic Acid as a Model Compound of the Aqueous Fraction of Microalgae HTL Using Co-M/SBA-15 (M: Cu, Ag, Ce, Cr) Catalysts.” Catalysts 9: 1013–31.10.3390/catal9121013Search in Google Scholar
Merkache, R., I. Fechete, M. Maamache, M. Bernard, P. Turek, K. Al-Dalama, and F. Garin. 2015. “3D Ordered Mesoporous Fe-KIT-6 Catalysts for Methylcyclopentane (MCP) Conversion and Carbon Dioxide (CO2) Hydrogenation for Energy and Environmental Applications.” Applied Catalysis A: General 504: 672–81, https://doi.org/10.1016/j.apcata.2015.03.032.Search in Google Scholar
Moslemi, A., A. Najafi Chermahini, J. Najafi Sarpiri, S. Rezaei, and M. Barati. 2019. “VOHPO4.5H2O/KIT-6 Composites: Preparation and Their Application in Extractive and Catalytic Oxidation Desulfurization of Benzothiophene and Dibenzothiphene.” Journal of the Taiwan Institute of Chemical Engineers 97: 237–46, https://doi.org/10.1016/j.jtice.2019.01.030.Search in Google Scholar
Ng, S., C. Fairbridge, S. Mutyala, Y. Liu, M. R. Bélanger, and J. R. J. Paré. 2013. “Microwave-assisted Conversion of Ethane to Ethylene.” Applied Petrochemical Research 3 (1–2): 55–61, https://doi.org/10.1007/s13203-013-0024-z.Search in Google Scholar
Qiu, C., Q. Meng, M. Panchal, C. Li, and B. Wu. 2020. “Enhanced Fischer-Tropsch Activity in Ammonium Nitrate Pretreated Cobalt- Silica Catalyst.” Catalysis Communications 147: 106149, https://doi.org/10.1016/j.catcom.2020.106149.Search in Google Scholar
Quijada, R., R. Rojas, G. Bazan, Z. J. A. Komon, R. S. Mauler, and G. B. Galland. 2001. “Synthesis of Branched Polyethylene from Ethylene by Tandem Action of Iron and Zirconium Single Site Catalysts.” Macromolecules 34 (8): 2411–17, https://doi.org/10.1021/ma0012088.Search in Google Scholar
Rahmani, F., M. Haghighi, and M. Amini. 2015. “The Beneficial Utilization of Natural Zeolite in Preparation of Cr/clinoptilolite Nanocatalyst Used in CO2-oxidative Dehydrogenation of Ethane to Ethylene.” Journal of Industrial and Engineering Chemistry 31: 142–55, https://doi.org/10.1016/j.jiec.2015.06.018.Search in Google Scholar
Rahmanzadeh, L., and M. Taghizadeh. 2019. “Hydrogen Production from Ethanol Steam Reforming Using Ce- and La-modified Mesoporous MCM-41 Supported Nickel-based Catalysts.” International Journal of Chemical Reactor Engineering 17 (8): 1–17, https://doi.org/10.1515/ijcre-2018-0212.Search in Google Scholar
Robinson, B., A. Caiola, X. Bai, V. Abdelsayed, D. Shekhawat, and J. Hu. 2020. “Catalytic Direct Conversion of Ethane to Value-Added Chemicals under Microwave Irradiation.” Catalysis Today: 0–1, https://doi.org/10.1016/j.cattod.2020.03.001.Search in Google Scholar
Ruelas-Leyva, J. P., A. Mata-Martinez, A. Talavera-López, S. A. Gómez, S. A. Jimenez-Lam, and G. A. Fuentes. 2018. “Dehydrogenation of Propane to Propylene with Highly Stable Catalysts of Pt-Sn Supported over Mesoporous Silica KIT-6.” International Journal of Chemical Reactor Engineering 16 (10): 1–10, https://doi.org/10.1515/ijcre-2017-0247.Search in Google Scholar
Saito, H., and Y. Sekine. 2020. “Catalytic Conversion of Ethane to Valuable Products through Non-oxidative Dehydrogenation and Dehydroaromatization.” RSC Advances 10 (36): 21427–53, https://doi.org/10.1039/d0ra03365k.Search in Google Scholar
Shen, W., Y. Wang, X. Shi, N. Shah, F. Huggins, S. Bollineni, M. Seehra, and G. Huffman. 2007. “Catalytic Nonoxidative Dehydrogenation of Ethane over Fe-Ni and Ni Catalysts Supported on Mg(Al)O to Produce Hydrogen and Easily Purified Carbon Nanotubes.” Energy and Fuels 21 (6): 3520–9, https://doi.org/10.1021/ef7004018.Search in Google Scholar
Smith, D. K., and L. G. Berry. 1974. Selected Powder Diffraction Data for Minerals, 1st ed. Pennsylvania: Joint Committee on Powder Diffraction Standards.Search in Google Scholar
Son, W. J., J. S. Choi, and W. S. Ahn. 2008. “Adsorptive Removal of Carbon Dioxide Using Polyethyleneimine-loaded Mesoporous Silica Materials.” Microporous and Mesoporous Materials 113 (1–3): 31–40, https://doi.org/10.1016/j.micromeso.2007.10.049.Search in Google Scholar
Sun, J., W. Wang, and Q. Yue. 2016. “Review on Microwave-Matter Interaction Fundamentals and Efficient Microwave-associated Heating Strategies.” Materials 9 (4), https://doi.org/10.3390/ma9040231.Search in Google Scholar
Sun, P., G. Siddiqi, W. C. Vining, M. Chi, and A. T. Bell. 2011. “Novel Pt/Mg(In)(Al)O Catalysts for Ethane and Propane Dehydrogenation.” Journal of Catalysis 282 (1): 165–74, https://doi.org/10.1016/j.jcat.2011.06.008.Search in Google Scholar
Taghizadeh, M., H. Akhoundzadeh, and A. Rezayan. 2018. “ScienceDirect Excellent Catalytic Performance of 3D-Mesoporous KIT-6 Supported Cu and Ce Nanoparticles in Methanol Steam Reforming.” International Journal of Hydrogen Energy 43 (24): 10926–37, https://doi.org/10.1016/j.ijhydene.2018.05.034.Search in Google Scholar
Taifan, W. E., G. X. Yan, and J. Baltrusaitis. 2017. “Surface Chemistry of MgO/SiO2 Catalyst during the Ethanol Catalytic Conversion to 1,3-butadiene: In-Situ DRIFTS and DFT Study.” Catalysis Science and Technology 7 (20): 4648–68, https://doi.org/10.1039/c7cy01556a.Search in Google Scholar
Tan, Y., S. Wang, L. Li, B. Meng, J. Chen, Z. Yang, K. Yan, and X. Qin. 2019. “Application of Microwave Heating for Methane Dry Reforming Catalyzed by Activated Carbon.” Chemical Engineering and Processing – Process Intensification 145: 107662, https://doi.org/10.1016/j.cep.2019.107662.Search in Google Scholar
Thommes, M., K. Kaneko, A. V. Neimark, J. P. Olivier, F. Rodriguez-Reinoso, J. Rouquerol, and K. S. W. Sing. 2015. “Physisorption of Gases, with Special Reference to the Evaluation of Surface Area and Pore Size Distribution (IUPAC Technical Report).” Pure and Applied Chemistry 87 (9–10): 1051–69, https://doi.org/10.1515/pac-2014-1117.Search in Google Scholar
Tsyganok, A., R. G. Green, J. B. Giorgi, and A. Sayari. 2007. “Non-oxidative Dehydrogenation of Ethane to Ethylene over Chromium Catalysts Prepared from Layered Double Hydroxide Precursors.” Catalysis Communications 8 (12): 2186–93, https://doi.org/10.1016/j.catcom.2007.04.031.Search in Google Scholar
Varisli, D., C. Korkusuz, and T. Dogu. 2017. “Microwave-assisted Ammonia Decomposition Reaction over Iron Incorporated Mesoporous Carbon Catalysts.” Applied Catalysis B: Environmental 201: 370–80, https://doi.org/10.1016/j.apcatb.2016.08.032.Search in Google Scholar
Vincent, I., and D. Bessarabov. 2018. “Low Cost Hydrogen Production by Anion Exchange Membrane Electrolysis: A Review.” Renewable and Sustainable Energy Reviews 81: 1690–704, https://doi.org/10.1016/j.rser.2017.05.258.Search in Google Scholar
Wang, L. C., Y. Zhang, J. Xu, W. Diao, S. Karakalos, B. Liu, X. Song, W. Wu, T. He, and D. Ding. 2019. “Non-oxidative Dehydrogenation of Ethane to Ethylene over ZSM-5 Zeolite Supported Iron Catalysts.” Applied Catalysis B: Environmental 256: 117816, https://doi.org/10.1016/j.apcatb.2019.117816.Search in Google Scholar
Wang, W., R. Qi, W. Shan, X. Wang, Q. Jia, J. Zhao, C. Zhang, and H. Ru. 2014. “Microporous and Mesoporous Materials Synthesis of KIT-6 Type Mesoporous Silicas with Tunable Pore Sizes , Wall Thickness and Particle Sizes via the Partitioned Cooperative Self-Assembly Process.” Microporous and Mesoporous Materials 194: 167–73, https://doi.org/10.1016/j.micromeso.2013.10.028.Search in Google Scholar
Wegener, E. C., Z. Wu, H. T. Tseng, J. R. Gallagher, Y. Ren, R. E. Diaz, F. H. Ribeiro, and J. T. Miller. 2018. “Structure and Reactivity of Pt–In Intermetallic Alloy Nanoparticles: Highly Selective Catalysts for Ethane Dehydrogenation.” Catalysis Today 299: 146–53, https://doi.org/10.1016/j.cattod.2017.03.054.Search in Google Scholar
Wildfire, C., V. Abdelsayed, D. Shekhawat, and M. J. Spencer. 2018. “Ambient Pressure Synthesis of Ammonia Using a Microwave Reactor.” Catalysis Communications 115: 64–7, https://doi.org/10.1016/j.catcom.2018.07.010.Search in Google Scholar
Wu, J., Z. Peng, and A. T. Bell. 2014. ““Effects of Composition and Metal Particle Size on Ethane Dehydrogenation over PtxSn100-x/Mg(Al)O (70–100).” Journal of Catalysis 311: 161–8, https://doi.org/10.1016/j.jcat.2013.11.017.Search in Google Scholar
Xia, D., Y. Chen, C. Li, C. Liu, and G. Zhou. 2018. “Carbon Dioxide Reforming of Methane to Syngas over Ordered Mesoporous Ni/KIT-6 Catalysts.” International Journal of Hydrogen Energy 43 (45): 20488–99, https://doi.org/10.1016/j.ijhydene.2018.09.059.Search in Google Scholar
Xiang, Y., H. Wang, J. Cheng, and J. Matsubu. 2018. “Progress and Prospects in Catalytic Ethane Aromatization.” Catalysis Science and Technology 8 (6): 1500–16, https://doi.org/10.1039/c7cy01878a.Search in Google Scholar
Xu, J., Y. Hong, M. J. Cheng, B. Xue, and Y. X. Li. 2019. “Vanadyl Acetylacetonate Grafted on Ordered Mesoporous Silica KIT-6 and its Enhanced Catalytic Performance for Direct Hydroxylation of Benzene to Phenol.” Microporous and Mesoporous Materials 285: 223–30, https://doi.org/10.1016/j.micromeso.2019.05.024.Search in Google Scholar
Xu, L., C. Wang, and J. Guan. 2014. “Preparation of Acid-Base Bifunctional Mesoporous KIT-6 (KIT: Korea Advanced Institute of Science and Technology) and its Catalytic Performance in Knoevenagel Reaction.” Journal of Solid State Chemistry 213: 250–5, https://doi.org/10.1016/j.jssc.2014.03.010.Search in Google Scholar
Xu, W., J. Zhou, Z. Su, Y. Ou, and Z. You. 2016. “Microwave Catalytic Effect: A New Exact Reason for Microwave-Driven Heterogeneous Gas-phase Catalytic Reactions.” Catalysis Science and Technology 6 (3): 698–702, https://doi.org/10.1039/c5cy01802a.Search in Google Scholar
Zhang, X., D. O. Hayward, and D. M. P. Mingos. 2003. “Effects of Microwave Dielectric Heating on Heterogeneous Catalysis.” Catalysis Letters 88: 33–8.10.1023/A:1023530715368Search in Google Scholar
Zhang, C., H. Yue, Z. Huang, S. Li, G. Wu, X. Ma, and J. Gong. 2013. “Hydrogen Production via Steam Reforming of Ethanol on Phyllosilicate- Derived Ni/SiO2: Enhanced Metal-Support Interaction and Catalytic Stability.” ACS Sustainable Chemistry and Engineering 1 (1): 161–73, https://doi.org/10.1021/sc300081q.Search in Google Scholar
Zhao, X. Q., S. Veintemillas-Verdaguer, O. Bomati-Miguel, M. P. Morales, and H. B. Xu. 2005. “Thermal History Dependence of the Crystal Structure of Co Fine Particles.” Physical Review B – Condensed Matter and Materials Physics 71 (2), https://doi.org/10.1103/PhysRevB.71.024106.Search in Google Scholar
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