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.
作者
唐铨
郭杨龙
詹望成
郭耘
王丽
王筠松
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)
出处
《化工学报》
EI
CAS
CSCD
北大核心
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)
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
propane
catalytic combustion
vacuum extraction and one coating method
monolithic catalyst
molecular sieves slurry
noble metals
