Deactivation mechanism and regeneration study of Zn/HZSM-5 catalyst in ethylene transformation

被引：22

作者：

Bonnin, Aurelien ^{[1
]}

Pouilloux, Yannick ^{[1
]}

Coupard, Vincent ^{[2
]}

Uzio, Denis ^{[2
]}

Pinard, Ludovic ^{[1
]}

机构：

[1] CNRS, Inst Chim Milieux & Mat Poitiers IC2MP, UMR 7285, 4 Rue Michel Brunet,Batiment B27,TSA 51106, F-86073 Poitiers 9, France

[2] IFP Energies Nouvelles, Etab Lyon, Rond Point Echangeur Solaize BP 3, F-69360 Solaize, France

来源：

APPLIED CATALYSIS A-GENERAL | 2021年 / 611卷

关键词：

Zn/H-ZSM-5; Ethylene; Deactivation; Coke; Lewis and Bronsted acid sites;

D O I：

10.1016/j.apcata.2020.117976

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 purpose of this study is to identify the deactivation mechanism(s) that occurs during the aromatization of dilute ethylene at 500 degrees C on Zn/H-MFI catalyst. More than 15 catalysts, with a Zn/H+ molar ratio ranging from 0 (H-ZSM5) to 1.8 (Zn/H-ZSM5), were prepared by wet impregnation. Deactivation does not result from Zn sublimation, but from coking. The deactivation function and coke deposition can be modelled by simple exponential laws. Moreover, the balance between Lewis (Zn) and Bronsted (H+) acid sites is a good descriptor for predicting the catalyst stability. The coke poisoning has a similar impact on the diminution of micropore volume as well as on the reduction of the number of Lewis and Bronsted acid sites. The best suited descriptor for describing deactivation is the reduction of the micropore volume.

引用

页数：13

共 38 条

[1] INFLUENCES OF COPPER ON PHYSICOCHEMICAL AND CATALYTIC PROPERTIES OF ZSM-5 ZEOLITES IN THE REACTION OF ETHENE AROMATIZATION [J].