铂和HF掺杂的H-ZSM-5分子筛催化甲苯与甲醇烷基化反应(英文)

作     者：Ahmed K. ABOUL-GHEIT Ateyya A. ABOUL-ENEIN Ahmed E. AWADALLAH Salwa A. GHONEIM Eman A. EMAM 

作者机构：Process Development DivisionEgyptian Petroleum Research Institute Department of Petroleum Refining and Chemical EngineeringCollege of Petroleum and Mining Engineering Suez Canal University 

出 版 物：《催化学报》 (催化学报)

年 卷 期：2010年第31卷第10期

页      面：1209-1216页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

主　　题：methanol toluene alkylation platinum hydrofluorination shape-selectivity ZSM-5 

摘      要：Toluene was alkylated with methanol in a flow type reactor at temperatures between 300 and 500 °C using H-ZSM-5 zeolite, 0.2%Pt/H-ZSM-5 and hydrofluorinated 0.2%Pt/H-ZSM-5 with HF concentrations of 1.0%, 2.0%, 3.0%, or 4.0%. Pt primarily enhances toluene conversion, total xylenes production, and p-xylene relative to its thermodynamic equilibrium. As the concentration of HF increases from 1.0% to 3.0%, the catalyst activity increases because of the increase in the number of acid sites and their strength. Additionally, the surface area and Pt dispersion also increases. An advantage of increased HF doping is that the formation of voluminous trimethylbenzene (TMB) byproducts is inhibited. However, at a HF concentration of 4.0%, Al and Si are partially leached and then deposited mostly in the wider catalytic pores. This was determined by evaluating the pore volume distribution and we determined that reactivity inhibition was ob-viously present and was due to diffusion restriction.