用于丙烷催化燃烧的Pd_xPt_y-ZSM-5/Cordierite整体式催化剂  

Catalytic combustion of propane over Pd_xPt_y-ZSM-5/Cordierite monolithic catalyst

作　　者：唐铨 郭杨龙[1] 詹望成[1] 郭耘[1] 王丽[1] 王筠松[1] TANG Quan;GUO Yanglong;ZHAN Wangcheng;GUO Yun;WANG Li;WANG Yunsong(Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China)

机构地区：[1]华东理工大学工业催化研究所,上海200237

出　　处：《化工学报》2019年第3期944-950,共7页CIESC Journal

基　　金：国家重点研发计划项目(2016YFC0204300)

摘　　要：以ZSM-5分子筛、铝溶胶、硝酸钯、硝酸铂和水为原料制备分子筛浆料,采用真空抽提-一次涂覆法在堇青石蜂窝陶瓷载体表面制备出Pd_xPt_y-ZSM-5/Cordierite整体式催化剂,考察了Pd负载量、ZSM-5分子筛的硅铝比和Pd/Pt质量比对整体式催化剂的丙烷催化燃烧性能的影响,并用超声波振荡、SEM、XRD、H_2-TPR和C_3H_8-TPD等手段对整体式催化剂进行了表征。当球磨时间为60 min,分子筛浆料固含量为38%时,整体式催化剂的涂层上载量可达到178 g·L^(-1),涂层脱落率低于0.5%。Pd_2Pt_3-ZSM-5/Cordierite整体式催化剂(贵金属总负载量为1.2g·L^(-1))对于丙烷的催化燃烧具有较好的催化活性(T_(50)=259℃,T_(90)=323℃)和稳定性,具有良好的工业应用前景,其中较低的ZSM-5分子筛硅铝比以及Pd和Pt之间的相互作用增加了对丙烷的吸附能力和表面活性氧物种的数量,从而提高了整体式催化剂的催化活性。Pd x Pt y-ZSM-5/Cordierite monolithic catalysts were prepared on the surface of the cordierite honeycomb supports, via vacuum extraction and one coating method, in which ZSM-5 molecular sieve, alumina sol, platinum or palladium nitrates and water were used as raw materials to prepare molecular sieve slurry. Effects of Pd loading, Si/ Al ratio of ZSM-5, the mass ratio of Pd/Pt on the catalytic performance of the monolithic catalysts for the catalytic combustion of propane were investigated. The monolithic catalysts were characterized by ultrasonic oscillation, SEM, XRD, H 2-TPR and C 3 H 8-TPD. When the ball milling time is 60 min and the molecular sieve slurry solid content is 38%, the coating amount of the monolith catalyst can reach 178 g?L-1 , and the coating detachment rate is less than 0.5%. Pd 2 Pt 3-ZSM-5 / Cordierite catalyst (total loading of noble metals of 1.2 g ? L-1 ) exhibits better catalytic activity and stability ( T 50 =259℃, T 90 =323℃) for the catalytic combustion of propane, which has better industrial application prospect. Lower Si / Al ratio of ZSM-5 and the interaction between Pd and Pt increase the amounts of adsorbed propane and surface active oxygen species, thus increases the catalytic performance of the monolithic catalyst.

关 键 词：丙烷 催化燃烧 真空抽提-一次涂覆法 整体式催化剂 分子筛浆料 贵金属 

分 类 号：TE991.1[石油与天然气工程—石油机械设备]