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Active sites in CO 2 hydrogenation over confined VO x -Rh catalysts
Science China Chemistry ( IF 9.6 ) Pub Date : 2019-10-10 , DOI: 10.1007/s11426-019-9590-6
Guishuo Wang , Ran Luo , Chengsheng Yang , Jimin Song , Chuanye Xiong , Hao Tian , Zhi-Jian Zhao , Rentao Mu , Jinlong Gong

Metal oxide-promoted Rh-based catalysts have been widely used for CO2 hydrogenation, especially for the ethanol synthesis. However, this reaction usually suffers low CO2 conversion and alcohols selectivity due to the formation of byproducts methane and CO. This paper describes an efficient vanadium oxide promoted Rh-based catalysts confined in mesopore MCM-41. The Rh-0.3VOx/MCM-41 catalyst shows superior conversion (~12%) and ethanol selectivity (~24%) for CO2 hydrogenation. The promoting effect can be attributed to the synergism of high Rh dispersion by the confinement effect of MCM-41 and the formation of VOx-Rh interface sites. Experimental and theoretical results indicate the formation of til-CO at VOx-Rh interface sites is easily dissociated into *CHx, and then *CHx can be inserted by CO to form CH3CO*, followed by CH3CO* hydrogenation to ethanol.

中文翻译:

受限VO x -Rh催化剂在CO 2加氢中的活性位

金属氧化物促进的Rh基催化剂已被广泛用于CO 2加氢,特别是用于乙醇合成。但是,由于副产物甲烷和一氧化碳的形成,该反应通常遭受低的CO 2转化率和醇选择性。本文描述了一种有效的氧化钒促进的Rh基催化剂,该催化剂被限制在中孔MCM-41中。Rh-0.3VO x / MCM-41催化剂对CO 2加氢显示出优异的转化率(〜12 %)和乙醇选择性(〜24 %)。通过MCM-41的限制作用和VO x -Rh界面位的形成,促进作用归因于高Rh分散的协同作用。实验和理论结果表明在VO形成til-COx -Rh界面位点很容易分解成* CH x,然后* CH x可以被CO插入形成CH 3 CO *,然后将CH 3 CO *加氢成乙醇。
更新日期:2019-10-14
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