Reaction pathways of n-butane cracking over the MFI, FER and TON zeolites: Influence of regional differences in Bronsted acid sites

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NSTL
Elsevier

外文摘要：Three zeolites ZSM-5, ZSM-35 and ZSM-22 are applied in n-butane cracking to reveal the influence of regional differences in Bronsted acid sites on reaction pathways. The Bronsted acid sites located in the channels of ZSM-5 exhibit a higher catalytic activity and yields to light olefins (especially the ethylene), which can be attributed to more relative contribution of bimolecular pathway. In comparison, more Bronsted acid sites are situated on the external surface or micropore mouths of ZSM-35 and ZSM-22, which are beneficial to propylene production. Note-worthily, almost no propane production on the two zeolites implies the predomination of monomolecular pathway. In situ FTIR technique further discloses that the difference in the reaction pathways is tailored by adsorption configurations of n-butane at two types of Bronsted acid sites. Under comparable conditions, the ZSM-5 performs a relatively good catalytic stability through bimolecular pathway. Furthermore, the correlation between deactivation rate and light olefins reveals that the enhancement of propylene selectivity accelerates the deactivation of ZSM-35 and ZSM-22. While, promotion on the ethylene selectivity is a significant inducement for the deactivation of ZSM-5.

外文关键词：

Zeolitesn-Butane catalytic crackingBronsted acid sitesReaction pathwaysDeactivation mechanismLIGHT OLEFINS PRODUCTIONCATALYTIC CRACKINGMONOMOLECULAR CRACKINGTHERMAL/CATALYTIC CRACKINGSURFACE MODIFICATIONPENTANE CRACKINGEXTERNAL ACIDITYSI/AL RATIOALKANESZSM-5

作者：

Guan, Linjie、Huang, Chengming、Han, Dingmei、Zhu, Linhua、Mei, Yi、He, Dedong、Zu, Yun

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作者单位：

Kunming Univ Sci & Technol

出版年：

2022

DOI：

10.1016/j.micromeso.2021.111605

Microporous and mesoporous materials

EISCI

ISSN：1387-1811

年,卷(期)：2022.330

被引量5
参考文献量55