Flexible regulation of C3^=/C2^= ratio in methanol-to-hydrocarbons by delicate control of acidity of ZSM-5 catalyst  

作　　者：shu-fang zhao xu-ting yao bing-hui yan li li yue-ming liu ming-yuan he 

机构地区：[1]shanghai key laboratory of green chemistry and chemical processes,school of chemistry and molecular engineering,east china normal university,shanghai 200062,China

出　　处：《Chinese Chemical Letters》2017年第6期1318-1323,共6页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.U1462106 and 21673076);the National Key Research and Development Program of China(No.2016YFB0701100)

摘　　要：Avery wide range of the C3^=/C2^= ratio from 0.72 to 7.56 with high C2^= ＋ C3^= selectivity of around 66%in the methanol-to-hydrocarbons process can be realized over ZSM-5 catalyst in a fixed-bed reactor.We firstly conduct a single factor experiment of acidity,demonstrating that the acidity control of MTH catalyst is crucial to adjusting light olefins selectivity.Weak Bronsted acid sites favor to high C3^= selectivity（59.0%）due to the suppression of the conversion reactions from the alkene-based to arene-based cycle,while Lewis acid sites conduce to high C2^= selectivity（39.6%） due to the promotion of the conversion reactions for the aromatics formation and steric constraints of Lewis acid sites making the aromatics crack more efficiently to C2^=.Avery wide range of the C3^=/C2^= ratio from 0.72 to 7.56 with high C2^= ＋ C3^= selectivity of around 66%in the methanol-to-hydrocarbons process can be realized over ZSM-5 catalyst in a fixed-bed reactor.We firstly conduct a single factor experiment of acidity,demonstrating that the acidity control of MTH catalyst is crucial to adjusting light olefins selectivity.Weak Bronsted acid sites favor to high C3^= selectivity（59.0%）due to the suppression of the conversion reactions from the alkene-based to arene-based cycle,while Lewis acid sites conduce to high C2^= selectivity（39.6%） due to the promotion of the conversion reactions for the aromatics formation and steric constraints of Lewis acid sites making the aromatics crack more efficiently to C2^=.

关 键 词：Acidity Methanol-to-hydrocarbons Lewis acidity Olefins Zeolites 

分 类 号：O643.36[理学—物理化学]