Enhanced ethene to propene ratio over Zn-modified SAPO-34 zeolites in methanol-to-olefin reaction

被引：36

作者：

Huang, Huiwen ^{[1
]}

Wang, Haoren ^{[1
]}

Zhu, Hui ^{[1
]}

Zhang, Shanhe ^{[1
]}

Zhang, Qiang ^{[1
]}

Li, Chunyi ^{[1
]}

机构：

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

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2019年 / 9卷 / 09期

关键词：

SILICOALUMINOPHOSPHATE MOLECULAR-SIEVES; CATALYTIC PERFORMANCE; MTO REACTION; NANOSIZED SAPO-34; LIGHT OLEFINS; ACID SITES; CONVERSION; SELECTIVITY; AROMATICS; ETHYLENE;

D O I：

10.1039/c9cy00335e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of Zn-modified SAPO-34 zeolites were prepared by the impregnation method and the effect of Zn modification on the catalytic performance of SAPO-34 zeolite in the methanol-to-olefin (MTO) reaction was comprehensively investigated. The physicochemical properties of the parent and Zn-modified SAPO-34 zeolites were characterized by XRD, SEM, N-2 adsorption-desorption, NH3-TPD, H-2-TPR, FTIR, UV-vis DRS and TGA. The reaction results show that the ethene selectivity and ethene to propene ratio are significantly improved over Zn-modified SAPO-34 zeolites in the initial period of the MTO reaction, and the optimum catalytic performance is obtained over 2.0Zn/SAPO-34 zeolite with a methanol conversion of 99.1 wt%, an ethene selectivity of 54.6 C-%, a light olefin selectivity of 88.9 C-% and an ethene to propene ratio of 1.9. Based on the characterization and reaction results, the enhanced ethene selectivity and ethene to propene ratio over Zn-modified SAPO-34 zeolites are attributed to the increased diffusion hindrance originating from the incorporated Zn-related species enrichment and the facilitated formation of aromatics.

引用

页码：2203 / 2210

页数：8

共 73 条

[71] Catalytic conversion of methanol to olefins on SAPO-n (n=11, 34, and 35), CrAPSO-n, and Cr-SAPO-n molecular sieves [J].