A first-principles microkinetic study on the hydrogenation of carbon dioxide over Cu(211) in the presence of water  

作　　者：Xitong Sun Peng Wang Zhengjiang Shao Xiaoming Cao P.Hu 

机构地区：[1]Key Laboratories for Advanced Materials,Centre for Computational Chemistry and Research Institute of Industrial Catalysis,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China [2]School of Chemistry and Chemical Engineering,Queen's University of Belfast,Belfast BT95AG,UK

出　　处：《Science China Chemistry》2019年第12期1686-1697,共12页中国科学（化学英文版）

基　　金：supported by the National Key Research and Development Program of China(2018YFA0208600);the National Natural Science Foundation of China(21673072,21333003,91845111);Program of Shanghai Subject Chief Scientist(17XD1401400)

摘　　要：The hydrogenation of carbon dioxide(CO2)is one of important processes to effectively convert and utilize CO2,which is also regarded as the key step at the industrial methanol synthesis.Water is likely to play an important role in this process,but it still remains elusive.To systematically understand its influence,here we computationally compare the reaction mechanisms of CO2 hydrogenation over the stepped Cu(211)surface between in the absence and presence of water based on microkinetic simulations upon density functional theory(DFT)calculations.The effects of water on each hydrogenation step and the whole activity and selectivity are checked and its physical origin is discussed.It is found that the water could kinetically accelerate the hydrogenation on CO2 to COOH,promoting the reverse water gas shift reaction to produce carbon monoxide(CO).It hardly influences the CO2 hydrogenation to methanol kinetically.In addition,the too high initial partial pressure of water will thermodynamically inhibit the CO2 conversion.The hydrogenation of carbon dioxide（CO2） is one of important processes to effectively convert and utilize CO2, which is also regarded as the key step at the industrial methanol synthesis. Water is likely to play an important role in this process, but it still remains elusive. To systematically understand its influence, here we computationally compare the reaction mechanisms of CO2 hydrogenation over the stepped Cu（211） surface between in the absence and presence of water based on microkinetic simulations upon density functional theory（DFT） calculations. The effects of water on each hydrogenation step and the whole activity and selectivity are checked and its physical origin is discussed. It is found that the water could kinetically accelerate the hydrogenation on CO2 to COOH, promoting the reverse water gas shift reaction to produce carbon monoxide（CO）. It hardly influences the CO2 hydrogenation to methanol kinetically. In addition, the too high initial partial pressure of water will thermodynamically inhibit the CO2 conversion.

关 键 词：CO2 activation microkinetic modeling DFT CH3OH selectivity 

分 类 号：O64[理学—物理化学]