当前位置: X-MOL 学术Catal. Today › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
SCILLs as selective catalysts for the oxidation of aromatic alcohols
Catalysis Today ( IF 5.3 ) Pub Date : 2018-07-05 , DOI: 10.1016/j.cattod.2018.07.014
Iunia Podolean , Octavian D. Pavel , Haresh G. Manyar , S.F. Rebecca Taylor , Kathryn Ralphs , Peter Goodrich , Vasile I. Pârvulescu , Christopher Hardacre

The cryptomelane form of manganese oxide, OMS-2, has been used a pure material as well as a 5 wt % Pt/OMS-2 catalyst for the oxidation of benzyl alcohol. In addition, these catalysts have been modified with ionic liquids via a thin layer of [Bmim][NTf2] or [Bmpyr][NTf2]. These catalysts were characterized using a series of techniques: NMR, XRD, DRIFT, Raman, BET, Dynamic Light Scattering, XPS, TEM, SEM. The Weisz–Prater criterion has also been considered to inform whether the reactions were under diffusional control. The presence of platinum on the OMS-2 surface results in the support transforming to form Mn3O4 during reaction. In contrast, in the presence of the ionic liquid, the catalysts exhibited an increased phase stability. Efficient oxidation of benzyl alcohol was observed with a conversion of 80% and 82% selectivity to aldehyde for 5 wt% Pt/OMS-2/[Bmim][NTf2] in air. As expected an increase of the oxygen pressure led to an increase in the conversion to the detriment of aldehyde selectivity. The catalytic tests also showed an important effect on the conversion and selectivity of benzyl alcohol as a function of the diluent gas comparing inert (N2, He, Ar) or (CO2) reactive gases. This effect was influenced by the nature of the ionic liquid present.



中文翻译:

SCILLs作为芳族醇氧化的选择性催化剂

氧化锰的隐甲烷形式OMS-2已被用作纯物质以及5 wt%的Pt / OMS-2催化剂用于苯甲醇的氧化。另外,这些催化剂已经通过[Bmim] [NTf 2 ]或[Bmpyr] [NTf 2 ]的薄层用离子液体改性。使用一系列技术对这些催化剂进行表征:NMR,XRD,DRIFT,拉曼,BET,动态光散射,XPS,TEM,SEM。还考虑使用Weisz–Prater准则来告知反应是否处于扩散控制之下。OMS-2表面上铂的存在导致载体转变为Mn 3 O 4。在反应过程中。相反,在离子液体的存在下,催化剂表现出增加的相稳定性。对于空气中5wt%的Pt / OMS-2 / [Bmim] [NTf 2 ],观察到苄醇的有效氧化,对醛的选择性转化率为80%和82%。如所预期的,氧气压力的增加导致转化率的增加,不利于醛的选择性。与惰性(N 2,He,Ar)或(CO 2)反应性气体相比,催化试验还显示出作为稀释气体函数的苯甲醇转化率和选择性的重要影响。该影响受存在的离子液体的性质影响。

更新日期:2018-07-05
down
wechat
bug