【摘要】 采用并流共沉淀方法制备了CuO-ZnO-ZrO2催化剂,并以金属氧化物为助剂对其进行了改性,在固定窗连续流动反应装置上考察了Ag2O和La2O32种助剂对CuO-ZnO-ZrO2催化剂催化CO2加氢合成甲醇反应性能的影响,及不同La2O3含量的CuO-ZnO-ZrO2的催化性能,采用X射线衍射(XRD)、H2-程序升温还原(H2-TPR)等方法对催化剂进行了表征。实验结果表明Ag2O和La2O3都可以提高CuO-ZnO-ZrO2催化剂的活性,而且添加6%La2O3(文中均指质量分数)的催化剂催化效果最好。添加Ag2O的催化剂中Ag作为活性中心参与CO2加氢合成甲醇的反应;对于La2O3改性的CuO-ZnO-ZrO2催化剂,适量La2O3有利于提高催化剂中CuO和ZnO的分散度。更多还原

【Abstract】 CuO-ZnO-ZrO2 catalysts are prepared by co-precipitation and modified with metal oxides as promoters.The effects of the addition of Ag2O or La2O3 promoter on the catalytic performance of CuO-ZnO-ZrO2 catalyst are investigated in a fixed-bed plug flow reactor for CO2 hydrogenation to methanol.The catalysts are characterized by XRD and H2-TPR.The results show that,both the promoters can improve the activity of CuO-ZnO-ZrO2 and the catalyst with 6% La2O3 shows the best catalytic activity.The investigation of catalysts indicates that Ag served as active sites in the CuO-ZnO-ZrO2 catalyst and the appropriate amount of La2O3 helps to improve the dispersion of CuO and ZnO.更多还原