燃料化学学报（中英文）2024，Vol.52Issue(9)：1214-1223,10.DOI:10.1016/S1872-5813(24)60450-0
Rh/CeO2催化剂中Rh的负载量对其CO2加氢生成甲醇和乙醇产物选择性的影响
Effect of Rh loading on the selectivity to methanol and ethanol in the hydrogenation of CO2 over the Rh/CeO2 catalyst
摘要
Abstract
The capture and hydrogenation of CO2 into high-value chemicals such as alcohols is one of the important ways to reduce CO2 emission and achieve carbon resource recycling.In this work,the catalytic performance of Rh/CeO2 catalyst in the CO2 hydrogenation was investigated;with the help of various characterization methods including XRD,Raman,H2-TPR,CO2-TPD,CO-DRIFTS and XPS,the influence of Rh loading(0.1％-2.0％)on the catalytic activity of Rh/CeO2 and product selectivity in the CO2 hydrogenation was revealed.The results indicate that for the hydrogenation of CO2 at 250 ℃ and 3.0 MPa over the Rh/CeO2 catalysts,ethanol is the major product at a low Rh loading of 0.1％.With the increase of Rh loading,the conversion of CO2 increases,but accompanied by a decrease in the selectivity to ethanol;when the Rh loading reaches 2.0％,the main product turns to be methanol.It seems that the difference of various Rh/CeO2 catalysts with different Rh loadings in the product selectivity for the CO2 hydrogenation is ascribed to their difference in the structural and electronic properties of Rh;atomically dispersed Rh species favor the stabilization of CO*and its subsequent C-C coupling with CH3*to form ethanol,whereas metallic Rh clusters facilitate the hydrogenation of CO*to produce methanol.关键词
CO2加氢/甲醇/乙醇/氧空位/Rh单原子/Rh团簇Key words
CO2 hydrogenation/methanol/ethanol/oxygen vacancies/single Rh atom/Rh cluster分类
化学化工引用本文复制引用
郑珂,刘冰,胥月兵,刘小浩..Rh/CeO2催化剂中Rh的负载量对其CO2加氢生成甲醇和乙醇产物选择性的影响[J].燃料化学学报（中英文）,2024,52(9):1214-1223,10.基金项目
The project was supported by the National Key Research and Development program of China(2023YFB4103201)and the National Natural Science Foundation of China(22379053).国家重点研发计划(2023YFB4103201)和国家自然科学基金(22379053)资助 （2023YFB4103201）
