稀土助剂Pr改性Cu/Zn/ZrO_2合成甲醇催化剂的催化性能  

Research on rare-earth promoter Pr-modified Cu/Zn/ZrO_2 catalyst for methanol synthesis

作　　者：覃志强[1] 高文桂[1] 王华[1] 韩冲[1] 郭伟[1] 

机构地区：[1]昆明理工大学冶金节能减排教育部工程研究中心,云南省复杂有色金属资源清洁利用国家重点实验室(培育基地),云南昆明650093

出　　处：《化工进展》2013年第4期820-823,共4页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(90610035);国家科技支撑计划(2011BAC01B03);昆明理工大学分析测试基金(2011405)项目

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。A series of Cu/Zn/ZrO2catalysts 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/ZrO2catalyst was investigated by using XRD,H2-TPR and CO2-TPD.The catalytic performances of CO2hydrogenation 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/ZrO2catalyst with a Pr2O3content of 3%.

关 键 词：稀土助剂 CO2加氢 氧化镨 合成甲醇 

分 类 号：O643[理学—物理化学]