关键词: 稀土助剂, CO2加氢, 氧化镨, 合成甲醇

Abstract: A series of Cu/Zn/ZrO2 catalysts were prepared by the co-precipitation method and modified via the addition of different amounts of Pr as rare-earth promoter. The influence of Pr2O3 amount on the structure of Cu/Zn/ZrO2 catalyst was investigated by using XRD，H2-TPR and CO2-TPD. The catalytic performances of CO2 hydrogenation to methanol over Cu/Zn/ZrO2 catalysts modified by five different amounts of Pr promoters were tested in a fixed-bed plug flow reactor. The results showed that the addition of rare-earth promoter of Pr could obviously enhance the surface alkalinity of catalyst，promote dispersion of the active component efficiently and stabilize the active center of the catalyst. Optimum catalytic activity was obtained over Cu/Zn/ZrO2 catalyst with a Pr2O3 content of 3%.

Key words: rare earth promoters, CO2 hydrogenation, Pr2O3, methanol synthesis