The role of CO_(2)dissociation in CO_(2)hydrogenation to ethanol on CoCu/silica catalysts  

作　　者：Zhongyan Wang Chengsheng Yang Xianghong Li Xiwen Song Chunlei Pei Zhi-Jian Zhao Jinlong Gong 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Collaborative Innovation Center of Chemical Science and Engineering,Tianjin University,Tianjin 300072,China [2]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China [3]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China

出　　处：《Nano Research》2023年第5期6128-6133,共6页纳米研究（英文版）

基　　金：the National Key R&D Program of China(No.2021YFA1500704);the National Natural Science Foundation of China(No.22121004);the Haihe Laboratory of Sustainable Chemical Transformations(No.CYZC202107);the Program of Introducing Talents of Discipline to Universities(No.BP0618007);the XPLORER PRIZE for financial support.

摘　　要：CoCu-based catalysts are widely used in CO_(x) hydrogenation reactions to produce higher alcohols due to the C–C coupling ability of Co and the ability of Cu to produce alcohols.This work describes the role of easily happened CO_(2)dissociation on the CoCu surface during the reaction,using different silica support to tune the metal–support interaction,reaches different selectivity to ethanol.CoCu supported on mesoporous silica MCM-41 shows ethanol selectivity as high as 85.3%,the ethanol space-time yield(STY)is 0.229 mmol/(gmetal∙h),however,poor selectivity to ethanol as low as 28.8%is observed on CoCu supported on amorphous silica.The different selectivity is due to the different intensities of CO_(2)dissociation on the catalysts.The adsorbed O*produced via CO_(2)dissociation can occupy the cobalt hollow sites on CoCu surfaces,which are also the adsorption sites of C1 intermediates for further C–C coupling.

关 键 词：CO_(2)hydrogenation bimetallic catalysts cobalt catalysts CO_(2)dissociation ethanol synthesis 

分 类 号：O64[理学—物理化学]