Copper-based catalysts were widely used in the heterogeneous selective hydrogenation of ethylene car-bonate (EC),a key step in the indirect conversion of CO2 to methanol.However,a high H2/EC molar ratio in feed is required to achieve favorable activity and the methanol selectivity still needs to be improved.Herein,we fabricated a series of Pt-modulated Cu/SiO2 catalysts and investigated their catalytic perfor-mance for hydrogenation of EC in a fixed bed reactor.By modulating the Pt amount,the optimal 0.2Pt-Cu/SiO2 catalyst exhibited the highest catalytic performance with ～99％ EC conversion,over 98％ selectiv-ity to ethylene glycol and 95.8％ selectivity to methanol at the H2/EC ratio as low as 60 in feed.In addition,0.2Pt-Cu/SiO2 catalyst showed excellent stability for 150 h on stream over different H2/EC ratios of 180-40.It is demonstrated a proper amount of Pt could significantly lower the H2/EC molar ratio,promote the reducibility and dispersion of copper,and also enhance surface density of Cu+ species.This could be due to the strong interaction of Cu and Pt induced by formation of alloyed Pt single atoms on the Cu lattice.Meanwhile,a relatively higher amount of Pt would deteriorate the catalytic activity,which could be due to the surface coverage and aggregation of active species.These findings may enlighten some fundamen-tal insights for further design of Cu-based catalysts for the hydrogenation of carbon-oxygen bonds.

Busha Assaba Fayisa;Yushan Xi;Youwei Yang;Yueqi Gao;Antai Li;Mei-Yan Wang;Jing Lv;Shouying Huang;Yue Wang;Xinbin Ma

Key Laboratory for Green Chemical Technology of Ministry of Education,Collaborative Innovation Center of Chemical Science and Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;Zhejiang Institute of Tianjin University,Ningbo 315201,China;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China

中国化学工程学报（英文版）

[1]Busha Assaba Fayisa;Yushan Xi;Youwei Yang;Yueqi Gao;Antai Li;Mei-Yan Wang;Jing Lv;Shouying Huang;Yue Wang;Xinbin Ma-.Pt-modulated Cu/SiO2 catalysts for efficient hydrogenation of CO2-derived ethylene carbonate to methanol and ethylene glycol)[J].中国化学工程学报（英文版）,2022(01):366-373

2Pt

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