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

摘要： 采用共沉淀法制备了Cu/Zn/ZrO2催化剂，并以稀土元素镨（Pr）为助剂添加不同含量对其进行改性。通过XRD、H2-TPR、CO2-TPD等表征手段考察了稀土助剂Pr2O3的含量对Cu/Zn/ZrO2催化剂结构的影响。在固定床连续流动反应装置上考察了5种助剂含量改性的Cu/Zn/ZrO2催化剂对CO2加氢合成甲醇反应的催化性能。结果表明：加入稀土助剂后，催化剂的表面碱性明显增强，有效地促进了活性组分的分散，稳定了催化剂的活性中心。当Pr2O3的含量为3%时，Cu/ Zn/ZrO2催化剂催化活性最佳。

关键词: 稀土助剂, CO2加氢, 氧化镨, 合成甲醇