Investigation on the mechanism of diffusion in mesopore structured ZSM-5 and improved heavy oil conversion

被引：149

作者：

Zhao, Liang

Shen, Baojian ^{[1
]}

Gao, Finsen

Xu, Chunming

机构：

[1] China Univ Petr, Key Lab Catalysis CNPC, State Key Lab Heavy Oil Proc, Beijing Changping 102249, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2008年 / 258卷 / 01期

基金：

中国国家自然科学基金;

关键词：

mesopore ZSM-5; diffusion; phase transition; re-arrangement; adsorption heat; activation energy; heavy oil cracking;

D O I：

10.1016/j.jcat.2008.06.015

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 large probe molecule, cumene, was chosen to study diffusion and adsorption on mesopore structured ZSM-5, using a high precision intelligent gravimetric analyzer. Compared with ZSM-5, a 2-3 order of magnitude increase in the diffusion coefficient of cumene was observed on the mesopore structured ZSM-5. The increased adsorption rate and the increased adsorption heat with increased cumene coverage, supported a mechanism of diffusion, phase transition, and re-arrangement of cumene molecules during the adsorption process on the mesopore structured ZSM-5. The introduced mesopores also decreased the diffusion-adsorption activation energy by a factor of 4.6. Consequently, although the amount of strong Bronsted acid sites decreased, the conversion of cumene on the mesopore structured ZSM-5 catalyst doubled compared to ZSM-5 catalyst, and the total light olefins yield increased by 2.47 wt% with Daqing heavy oil as a feedstock. (c) 2008 Elsevier Inc. All rights reserved.

引用

页码：228 / 234

页数：7

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