Effect of Modified Zeolite on One-Step Process of DME Synthesis

被引：5

作者：

Xu, Q. -L. ^{[1
]}

Lan, P. ^{[2
]}

Zhang, S. -P. ^{[1
]}

Li, T. -C. ^{[1
]}

Yan, Y. -J. ^{[1
]}

机构：

[1] E China Univ Sci & Technol, Res Ctr Biomass Energy, Shanghai 200237, Peoples R China

[2] Guangxi Univ Nationalities, Sch Chem & Ecoengn, Guangxi, Peoples R China

来源：

PETROLEUM SCIENCE AND TECHNOLOGY | 2011年 / 29卷 / 05期

关键词：

bifunctional catalyst; CaO; DME; MgO; zeolite HZSM-5; ZnO; DIMETHYL ETHER; HYBRID CATALYSTS; GAMMA-ALUMINA; DEHYDRATION; SYNGAS; CONVERSION; METHANOL; GA;

D O I：

10.1080/10916460903117552

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

HZSM-5 zeolites modified by MgO, CaO, and ZnO were prepared by impregnation and bifunctional catalysts were prepared by modified HZSM-5 zeolites and JC207 catalyst (a catalyst for methanol synthesis, which has been industrialized in China). Evaluation of catalytic activity was conducted in a fixed-bed reactor. Results show, with proper basic oxide-modified zeolite, a Bronsted acid site (strong acid sites) shift to Lewis acid site (weak acid sites). Weak and less strong acid sites on HZSM-5 zeolite are activity centers for the formation of dimethyl ether (DME), whereas strong acid sites for by products such as hydrocarbons. Consequently, the selectivity of CO2 and hydrocarbons decrease, especially with zeolite modified by CaO.

引用

页码：439 / 448

页数：10

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