Effect of Steam Treatment on the Catalytic Performance of ZSM-5 in the Co-conversion of Methanol and n-Hexane to Aromatics

作     者：Wei Shumei Xu Yarong Yang Fan Zhu Kake Zhu Xuedong 

作者机构：State Key Laboratory of Chemical EngineeringSchool of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Research Institute of Urumqi Petrochemical CompanyPetrochinaUrumqi 830019China 

出 版 物：《China Petroleum Processing & Petrochemical Technology》 (中国炼油与石油化工（英文版）)

年 卷 期：2024年第26卷第3期

页      面：73-81页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：We gratefully acknowledge financial support from the National Nature Science Foundation of China(2177606) PetroChina(Development of methanol coupled light hydrocarbon aromatization catalyst and process technology,2016A-24308) 

主　　题：steam ZSM-5 zeolites co-conversion aromatization methanol n-hexane 

摘      要：Steam pretreatment is a widely used method for modifying the acidity and structure of zeolites,thereby enhancing their catalytic *** study systematically investigated the effects of steam treatment on ZSM-5 zeolites at varying treatment temperatures and *** structural evolution of the catalysts was monitored using N2 adsorptiondesorption,X-ray diffraction,inductively coupled plasma optical emission spectroscopy,scanning electron microscopy,NH3 temperature-programmed desorption,in situ pyridine infrared spectroscopy,and thermogravimetric *** characterization results revealed that mesopores were introduced into the ZSM-5 zeolite catalysts through dealumination induced using steam treatment at moderate temperatures(400 and 500℃).Moreover,compared with the parent catalyst,the steam-treated catalysts exhibited a lower amount of acid sites and relative crystallinity,while the n(Si)/n(Al)ratio *** the co-conversion of methanol and n-hexane in a fixed bed reactor at 400℃and 0.5 MPa(N2 atmosphere),with a weight hourly space velocity of 1 h−1 and a stoichiometric ratio of 1:1(CH3OH to n-hexane),the steam-treated catalysts displayed a prolonged catalyst ***,the parent zeolite had a lifetime of 96 h,while the catalyst treated at 500℃for 12 h had a lifetime of up to 240 ***,the steam-treated catalysts maintained stable n-hexane conversion and improved aromatic ***,these treated catalysts exhibited a lower deactivation rate than the parent catalyst,and would be conducive to industrial scale-up production.