摘要
介绍了汽油硫化物在FCC过程中的生成和转化机理,重点对噻吩类硫化物的几种转化途径进行了分析,指出在催化剂酸性中心上噻吩类硫化物主要发生的反应;介绍了FCC汽油硫化物转化和生成反应网络,指出烷基化、环化脱氢反应可以使噻吩、烷基噻吩变成更大分子的硫化物,氢转移反应可以促进硫化物向H_2S的转化,同时H_2S和烯烃反应生成硫化物;在此基础上,提出了降低汽油硫含量要考虑的几个方面,为新型降硫催化剂的开发提供理论基础。
The formation and conversion mechanisms of sulfur compounds of naphtha in FCC units are reviewed. Several conversion approaches of thiophenic compounds are focused and the main reactions on the acid sites of catalysts are mentioned. Finally, the reaction network concerning the conversion and formation of sulfur compounds in FCC naphtha is presented. It can be seen that thiophene and alky-thiophene are converted to large sulfur-containing molecules by alkylation and cyclization/ dehydrogenation reactions,hydrogen transfer reactions result in the conversion of sulfur compounds to form H2S,and simultaneously H2S and olefins will react to form thiophenic compounds. Based on the above investigation, some effective suggestions to reduce the sulfur content in FCC naphtha are proposed,which will he helpful for developing new desulfurization catalysts.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2009年第7期23-27,共5页
Petroleum Processing and Petrochemicals
基金
国家973项目(2006CB202501)
关键词
转化机理
汽油
脱硫
硫化物
催化剂
述评
conversion mechanism
gasoline
desulfurization
sulfur compound
catalyst
review
