Prevention of zeolite deactivation by coking

被引：437

作者：

Guisnet, Michel ^{[1
,2
]}

Costa, Luis ^{[1
]}

Ribeiro, Fernando Ramoa ^{[1
]}

机构：

[1] Inst Super Tecn, Ctr Biol & Chem Engn, Inst Biotechnol & Bioengn, P-1049001 Lisbon, Portugal

[2] Univ Poitiers, Catalyse Chim Organ Lab, UMR 6503, CNRS, F-86000 Poitiers, France

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2009年 / 305卷 / 1-2期

关键词：

Zeolite; Deactivation; Modes of coking; Coke composition; Acidity; N-HEPTANE CRACKING; M-XYLENE TRANSFORMATION; CARBONACEOUS DEPOSITS; USHY ZEOLITE; CATALYST DEACTIVATION; HYDROGEN OFFRETITE; COKE FORMATION; PORE STRUCTURE; REGENERATION; LOCATION;

D O I：

10.1016/j.molcata.2008.11.012

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：

The deactivation of acid zeolite catalysts is essentially due to the formation and trapping of heavy secondary products (coke) within the pores (channels and cages). As in these nanosized pores the growth of these products is sterically limited, the coke composition, i.e., the quantitative distribution in nature and size of the components, can be determined and the scheme and mechanisms of coke formation established. Moreover, coupling activity, acidity and adsorption data with coke composition leads to information on the location and deactivating effect of coke molecules. Based on the influence on coking and deactivation rates of the features of reactions and zeolite catalysts, general rules are proposed for limiting the rate of formation of coke molecules and minimising their deactivating effect. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：69 / 83

页数：15

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