金属掺杂对PdM/ZnO催化CO_(2)加氢制甲醇性能的影响  

Effect of metal doping on the performance of PdM/ZnO catalysts for CO_(2)hydrogenation to methanol

作　　者：生学良 李娘修 金建飞 何建云 李世民 张潇 刘锋 蒋云波 SHENG Xueliang;LI Niangxiu;JIN Jianfei;HE Jianyun;LI Shimin;ZHANG Xiao;LIU Feng;JIANG Yunbo(Yunnan precious metals laboratory Co.Ltd.,Kunming 650106,China;Kunming Institute of Precious Metals,Kunming 650106,China)

机构地区：[1]云南贵金属实验室有限公司,昆明650106 [2]昆明贵金属研究所,昆明650106

出　　处：《贵金属》2025年第1期10-18,25,共10页Precious Metals

基　　金：云南贵金属实验室科技计划项目(YPML-2022050211,YPML-2022050213);国家重点研发计划项目(2022YFE0105100)。

摘　　要：Pd催化剂可用于CO_(2)加氢制甲醇。采用浸渍沉淀法制备了不同负载量的x%Pd/ZnO(x=1,3,5),并制备了系列掺杂催化剂PdM/ZnO(M=In,Zn,Bi),研究其催化性能并对使用前后催化剂的形貌结构和化学形态进行分析表征。TEM表征结果显示,Pd以3.5 nm的PdO形态负载于纳米ZnO表面,反应后催化剂表面的Pd由PdO转化为Pd^(0)和PdZn。催化性能评价对比结果显示,较低的温度条件(250℃)更有利于甲醇的生成,负载量较低的1%Pd/ZnO催化剂性能较佳;加入In、Zn、Bi金属掺杂有助于钯颗粒的均匀分散,抑制副反应发生,其中掺杂Bi后转化率和选择性较佳。Pd-based catalysts are effective for CO_(2)hydrogenation to methanol.In this study,a series of x%Pd/ZnO(x=1,3,5)catalysts were prepared using a precipitation-impregnation method,along with PdM/ZnO(M=In,Zn,Bi)catalysts with different metal dopants.The catalytic performance was evaluated,and the morphology,structure,and chemical states of the catalysts before and after the reaction were characterized.TEM characterization results revealed that Pd was loaded onto the surface of nano-ZnO in the form of PdO particles with an average size of approximately 3.5 nm.After the reaction,the Pd species on the catalyst surface were transformed from Pd^(0) into metallic Pd0 and PdZn alloy phases.Catalytic performance evaluation showed that lower reaction temperatures(e.g.,250℃)were more favorable for methanol production,with the 1%Pd/ZnO catalyst exhibiting the best performance among the tested samples.The introduction of secondary metal dopants such as In,Zn,and Bi contributed to a more uniform dispersion of Pd particles and effectively suppressed side reactions.Among these,Bi doping led to the highest CO_(2)conversion and methanol selectivity.

关 键 词：CO_(2)加氢制甲醇 催化剂 PdM/ZnO Pd负载量 金属掺杂 化学形态 

分 类 号：O643.38[理学—物理化学]