Enhanced stability of Fe-modified CuO-ZnO-ZrO_(2)-Al_(2)O_(3)/HZSM-5 bifunctional catalysts for dimethyl ether synthesis from CO_(2)hydrogenation  

作　　者：Xiao Fan Shoujie Ren Baitang Jin Shiguang Li Miao Yu Xinhua Liang 

机构地区：[1]Department of Chemical and Biochemical Engineering,Missouri University of Science and Technology,Rolla,MO 65409,United States [2]Gas Technology Institute,1700 South Mount Prospect Road,Des Plaines,IL 60018,United States [3]Department of Chemical and Biological Engineering,Rensselaer Polytechnic Institute,Troy,NY 12180,United States

出　　处：《Chinese Journal of Chemical Engineering》2021年第10期106-113,共8页中国化学工程学报（英文版）

基　　金：supported by the U.S.Department of Energy through contract DE-AR0000806。

摘　　要：A series of iron(Fe)modified CuO-ZnO-ZrO_(2)-Al_(2)O_(3)(CZZA)catalysts,with various Fe loadings,were prepared using a co-precipitation method.A bifunctional catalyst,consisting of Fe-modified CZZA and HZSM-5,was studied for dimethyl ether(DME)synthesis via CO_(2)hydrogenation.The effects of Fe loading,reaction temperature,reaction pressure,space velocity,and concentrations of precursor for the synthesis of the Fe-modified CZZA catalyst on the catalytic activity of DME synthesis were investigated.Long-term stability tests showed that Fe modification of the CZZA catalyst improved the catalyst stability for DME synthesis via CO_(2)hydrogenation.The activity loss,in terms of DME yield,was significantly reduced from 4.2%to 1.4%in a 100 h run of reaction,when the Fe loading amount was 0.5(molar ratio of Fe to Cu).An analysis of hydrogen temperature programmed reduction revealed that the introduction of Fe improved the reducibility of the catalysts,due to assisted adsorption of H2 on iron oxide.The good stability of Femodified CZZA catalysts in the DME formation was most likely attributed to oxygen spillover that was introduced by the addition of iron oxide.This could have inhibited the oxidation of the Cu surface and enhanced the thermal stability of copper during long-term reactions.

关 键 词：CO_(2)hydrogenation Cu-ZnO based catalyst Iron(Fe) Dimethyl ether(DME) STABILITY 

分 类 号：TQ223.24[化学工程—有机化工] TQ426