涂层和贵金属分布对三效催化剂活性的影响  

The Effects of Coating and Noble Metal Distribution on the Activityof Three-effect Catalysts

作　　者：王玲 钱正枝 WANG Ling;QIAN Zhengzhi(Anhui Health College,Chizhou Anhui 247099,China;Anhui Act Blue Environmental Protection Co.,Ltd.,Chizhou Anhui 247100,)

机构地区：[1]安徽卫生健康职业学院,安徽池州247099 [2]安徽艾可蓝环保股份有限公司,安徽池州247100

出　　处：《佳木斯大学学报（自然科学版）》2024年第9期89-92,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：工信部节能低碳材料生产应用示范平台资助(TC220H06N)。

摘　　要：研究涂层和贵金属分布对三效催化剂活性的影响。将涂层和贵金属分布综合考虑,分别制备了涂层和贵金属总量相同但分布不同的三种催化剂,并考察了三种催化剂在新鲜态和老化态时对尾气污染物CO,HC,NO_(X)的转化率。保持涂层和贵金属总量相同,改变涂层和贵金属的分布会影响催化剂对三种污染物的催化活性。对于CO和HC尾气污染物,贵金属Pd在涂层分布中有更高的浓度且分布于中间涂层有利于催化剂的催化活性;对于NO_(X)尾气污染物,少量的贵金属Pd和Rh融合在一起可以发生协同作用,提高Rh的利用率,增强了对NO_(X)的转化。从整体的三效催化剂看,多次分层涂覆且第一层为空涂层可以增加催化剂的稳定性和老化性能。Objective Studying the effects of coating and noble metal distribution on the activity of three-effect catalysts.Method We prepared three catalysts with the same amount of coating and noble metal but different distribution,then tested the conversions of the three catalysts to the exhaust pol-lutants CO,HO and NO_(X) in the fresh and aged state.Results Keeping the same total amount of coating and noble metal,changing the distribution of coating and noble metal would affect the activity of the cat-alyst to the three exhaust pollutants?Conclusion For CO and HC exhaust pollutants,the catalyst which has a higher concentration of noble metal Pd in the coating distribution and that the noble metal Pd dis-tributes in the intermediate coating is conducive to the activity.For NO_(X) exhaust pollutants,a small a-mount of noble metal Pd and Rh fused together have a synergistic effect,the noble metal Pd can improve the utilization of Rh and then enhance the conversion of NO_(X).From the perspective of the overall three-way catalyst,the stability and aging performance of the catalyst can be increased by multiple layered coating with the first layer being empty.

关 键 词：三效催化剂 涂层厚度 贵金属分布 活性 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]