Influence of crystal size on the catalytic performance of H-ZSM-5 and Zn/H-ZSM-5 in the conversion of methanol to aromatics

被引：163

作者：

Niu, Xianjun ^{[1
,2
,3
]}

Gao, Jie ^{[1
,3
]}

Wang, Kai ^{[1
,3
]}

Miao, Qing ^{[1
,3
]}

Dong, Mei ^{[1
]}

Wang, Guofu ^{[1
]}

Fan, Weibin ^{[1
]}

Qin, Zhangfeng ^{[1
]}

Wang, Jianguo ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, POB 165, Taiyuan 030001, Shanxi, Peoples R China

[2] Jinzhong Univ, Coll Chem & Chem Engn, Jinzhong 030619, Shanxi, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

FUEL PROCESSING TECHNOLOGY | 2017年 / 157卷

基金：

中国国家自然科学基金;

关键词：

Methanol to aromatics; H-ZSM-5; Zn/H-ZSM-5; Crystal size; Zinc species; EXCHANGED ZSM-5 ZEOLITES; CONFINED SPACE SYNTHESIS; TO-OLEFIN REACTIONS; ACID SITES; SELECTIVE CONVERSION; PROPANE AROMATIZATION; HZSM-5; ZEOLITES; LOWER ALKANES; HYDROCARBONS; ZN;

D O I：

10.1016/j.fuproc.2016.12.006

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

H-ZSM-5 zeolites with a uniform crystal size from 0.25 to 2 pm were obtained by adding colloidal silicalite-1 seed in the synthesis gel; with H-ZSM-5 as the support, Zn/H-ZSM-5 was prepared by incipient wet impregnation. The influence of crystal size on the state of Zn species and its relation to the catalytic performance of Zn/H-ZSM-5 in the conversion of methanol to aromatics (MTA) was then investigated. The results illustrated that the state of Zn species and catalytic performance of Zn/H-ZSM-5 are closely related to the crystal size, though the crystal size has little influence on the overall acidity. There exist mainly two types of zinc species, viz., ZnO and ZnOH+; Zn/H-ZSM-5 with smaller crystal size is provided with more ZnOH+ species. The selectivity to aromatics and catalyst stability can be improved greatly by using small crystal Zn/H-ZSM-5. A good linear correlation is observed between the amount of ZnOH+ species and the selectivity to aromatics, suggesting that ZnOH+ species plays an important role in enhancing the dehydrogenation of alkanes and aromatization bf alkenes to aromatics. As a result, small crystal Zn/H-ZSM-5 with large portion of ZnOH+ species exhibits high selectivity to aromatics and long lifetime in MTA. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：99 / 107

页数：9

共 61 条

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