酸中心在FCC催化剂上的形成机制  

Study on formation mechanism of Acid Sites in FCC catalyst

作　　者：于善青[1] 贺振富[1] 田辉平[1] 龙军[1] 

机构地区：[1]中国石油化工股份有限公司石油化工科学研究院,北京100083

出　　处：《炼油与化工》2009年第4期8-12,共5页Refining And Chemical Industry

基　　金：国家973项目(2006CB202501)

摘　　要：分析了催化裂化催化剂酸中心的形成机制,重点论述了HY沸石及REY沸石中B酸中心的形成机理,以及催化剂基质和沸石中L酸中心的产生途径。在此基础上,探讨了催化裂化催化剂酸中心的作用及其活性恢复,认为烯烃环化生成的环正碳离子能提供H+给B酸中心对应的共轭碱中心,使B酸中心的活性恢复;烯烃经环化、异构化后生成的异构环正碳离子能从L酸中心对应的共轭碱中心(LH-)上吸取H-,使L酸中心的活性恢复。The formation mechanism of acid sites,mainly the formation mechanism of Bronsted acid sites in HY and REY zeolite as well as Lewis acid sites in matrices and zeolite of FCC catalysts are analyzed.Based on this,the effect and activity recovery of these acid sites are discussed.Cyclocarbonium generated by olefin cyclization can provide hydrogen proton for conjugate base sites of Bronsted acid sites and thus make their activity recovered.Iso-cyclocarbonium generated by olefin cyclization and isomerization can obtain hydrogen negative ion and thus the activity of Brponsted acid sites and Lewis acid sites in FCC catalysts are recovered.

关 键 词：催化裂化催化剂 沸石 酸中心 活性 

分 类 号：O643[理学—物理化学]