甲醇制丙烯过程中ZSM-5催化剂的失活行为  

DEACTIVATION OF ZSM-5 CATALYSTS DURING METHANOL-TO-PROPYLENE PROCESS

作　　者：温鹏宇[1] 梅长松[2] 刘红星[2] 杨为民[2] 陈庆龄[1] 

机构地区：[1]华东理工大学化学与制药学院,上海200237 [2]中国石化上海石油化工研究院,上海201208

出　　处：《石油学报（石油加工）》2008年第4期446-450,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究规划"973"项目(2003CB615801)资助

摘　　要：采用IR、TG、低温N2-吸附等手段对用于甲醇制丙烯(MTP)反应的高硅小晶粒ZSM-5催化剂的结焦和失活过程进行研究。结果表明,ZSM-5催化剂具有良好的水热稳定性;分子筛孔道中的可溶性结焦物主要以三甲基苯为主,含量存在一个积累过程,并在48 h达到最大值,随后保持相对稳定;分子筛表面积炭堵塞孔道是导致催化剂失活的主要原因,即积炭量随反应时间延长而持续增加,当其外表面容纳不了更多的积炭时,形成的积炭物质将堵塞沸石孔口,从而使得催化剂在770 h后突然失活。The coke formation and deactivation process of high silica ZSM-5 catalyst with small particle size used in the reaction of methanol to produce propylene were studied by IR, TG and N2-adsorption techniques. The results showed that the ZSM-5 catalyst was of good hydrothermal stability. The soluble coke in ZSM-5 channels was mainly consisted of three substituted benzenes, which accumulated sharply in the reaction initial period and reached its maximum at reaction time of 48 h and then remained nearly unchanged for the most reaction period. It was the carbon deposition that caused the deactivation of the ZSM-5 catalyst. As the ZSM-5 exterior surface could not accommodate any more carbon coke, the newly formed coke would block the pore of ZSM-5 and subsequently resulted in a sharp deactivation of the catalyst after a long run time of 770 h.

关 键 词：甲醇 丙烯 ZSM-5 结焦 失活 

分 类 号：O643[理学—物理化学]