Loading CuO on the surface of MgO with low-coordination basic O^(2-)sites for effective enhanced CO_(2) capture and photothermal synergistic catalytic reduction of CO_(2) to ethanol  

作　　者：Ting Li Hongxia Guo Xiao Wang Huan Wang Li Liu Wenquan Cui Xiaoran Sun Yinghua Liang 

机构地区：[1]College of Chemical Engineering,Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials,North China University of Science and Technology,Tangshan 063210,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第9期58-67,共10页中国化学工程学报（英文版）

基　　金：Financial supports by National Natural Science Foundation of China(21908052);the Key Program of Natural Science Foundation of Hebei Province(B2020209017);the Project of Science and Technology Innovation Team,Tang shan(20130203D);Youth Program of Natural Science of Hebei Province(B2020209065)。

摘　　要：The higher capacity of CO_(2)adsorption on the surface of magnesium oxide(MgO)with low-coordination O^(2-)sites would effectively enhance the catalytic reduction of CO_(2).Herein,a series of copper oxide(CuO)and MgO composites with different mass ratios have been prepared by hydrothermal method and used for photothermal synergistic catalytic reduction of CO_(2)to ethanol.The catalyst with CuO mass ratio of 1.6% shows the best yield(15.17μmol·g^(-1)·h^(-1))under 3 h Xenon lamp illumination.The improved performance is attributable to the loose nano-sheet structure,uniform dispersion of active sites,the increased specific surface area,medium-strength basicity,the high separation efficiency of electrons and holes,and the formation of Mg-O-Cu species.The synthesized CuO and MgO composites with loose nano-sheet structure facilitate the diffusion of reactants CO_(2),so an excellent CO_(2)adsorption performance can be obtained.Meanwhile,the introduction of CuO in the form of bivalence provides higher specific surface area and porosity,thus obtaining more active sites.More importantly,the Mg-O-Cu species make the donation of electrons from MgO to CO_(2)easier,resulting in the breaking of the old Mg-O bond and the formation of C-O bond,thus promoting the adsorption and conversion of CO_(2)to ethanol.

关 键 词：CO_(2)reduction Photothermal catalysis ETHANOL MGO CUO 

分 类 号：O64[理学—物理化学]