Structural properties and catalytic performance of the La-Cu-Zn mixed oxides for CO2 hydrogenation to methanol  

作　　者：Haijuan Zhan Zhiqiang Wu Ning Zhao Wanyi Liu Wei Wei 

机构地区：[1]School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China [2]State Key Laboratory of High-efficiency Coal Utilization and Green Chemistry Engineering,Ningnia University,Yinchuan 750021,China [3]State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sdences,Taiyuan 030001,China [4]Center for Greenhouse Gas and Environmental Engineering Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201203,China

出　　处：《Journal of Rare Earths》2018年第3期273-280,共8页稀土学报（英文版）

基　　金：Project supported by the Natural Science Foundation of Ningxia Province(NZ16003)

摘　　要：A series of La-Cu-Zn-O mixed oxide catalysts were synthesized by a co-precipitation method and calcined under different temperatures. The XRD, BET, TPR, N2 O-adsorption, XPS, SEM and TPD techniques were carried out to measure the aimed catalysts. The results indicated that the chemical environment of lanthanum element changes with the increase of calcination temperature. The La2 CuO4 perovskite structure is obtained at the temperature higher than 823 K and the special copper species appear in the perovskites due to the special structure property. The catalysts with La2 CuO4 perovskite structure show higher methanol selectivity compared with the mixed copper catalyst. For the perovskite catalysts, the conversion of CO2 changes with the same tendency of the copper species ratio（（Cu^（α＋）＋Cu^0）/（Cu（Total））%）, which implied both Cu^（α＋） and Cu^0 are important active sites in the perovskite catalyst for the reaction.A series of La-Cu-Zn-O mixed oxide catalysts were synthesized by a co-precipitation method and calcined under different temperatures. The XRD, BET, TPR, N2 O-adsorption, XPS, SEM and TPD techniques were carried out to measure the aimed catalysts. The results indicated that the chemical environment of lanthanum element changes with the increase of calcination temperature. The La2 CuO4 perovskite structure is obtained at the temperature higher than 823 K and the special copper species appear in the perovskites due to the special structure property. The catalysts with La2 CuO4 perovskite structure show higher methanol selectivity compared with the mixed copper catalyst. For the perovskite catalysts, the conversion of CO2 changes with the same tendency of the copper species ratio（（Cu^（α＋）＋Cu^0）/（Cu（Total））%）, which implied both Cu^（α＋） and Cu^0 are important active sites in the perovskite catalyst for the reaction.

关 键 词：La2CuO4 perovskite CO2 hydrogenation Rare earths 

分 类 号：O643.36[理学—物理化学] TU261[理学—化学]