Effect of magnesium modification over H-ZSM-5 in methanol to propylene reaction

被引：41

作者：

Chen, Chen ^{[1
]}

Zhang, Qiang ^{[1
]}

Meng, Zhe ^{[1
]}

Li, Chunyi ^{[1
]}

Shan, Honghong ^{[1
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China

来源：

APPLIED PETROCHEMICAL RESEARCH | 2015年 / 5卷 / 04期

基金：

中国国家自然科学基金;

关键词：

ZSM-5; Mg; Modification; Acidity; Deactivation;

D O I：

10.1007/s13203-015-0129-7

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

H-ZSM-5-based catalyst is a recognized catalyst which is particularly selective towards the formations of light olefins in the methanol reaction. A series of H-ZSM-5 (SiO2/Al2O3 = 38) modified with different amounts of magnesium have been investigated. All the samples were characterized by X-ray diffraction instrument (XRD), temperature-programmed desorption of NH3 (NH3-TPD) and Fourier Transform Infrared Spectoscopy (FTIR). The results indicated that the impregnation of H-ZSM-5 (SiO2/Al2O3 = 38) zeolite with various magnesium loading amount significantly affected the strength of acid sites and decreased the concentration of both weak and strong acid sites. As a result of modification, magnesium mainly interacted with strong Bronsted acid sites, thus generated new medium strong acid sites and enhanced the yield of propylene. The optimum acid property for methanol to propylene (MTP) reaction was gotten over 4.0 Mg-ZSM-5 (4.0 wt% Mg) zeolite catalyst. The maximum yield of propylene was 10.62 wt% over 4.0 MgZSM-5 zeolite catalyst by the 30 min on stream. Coke which was mostly formed on strong Bronsted acid sites, would cause the catalysts deactivation, so the reduction of strong Bronsted acid sites could enhance the catalytic stability.

引用

页码：277 / 284

页数：8

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