{"title":"Deactivation mechanism and regeneration study of Zn/HZSM-5 catalyst in ethylene transformation","authors":"Aurélien Bonnin , Yannick Pouilloux , Vincent Coupard , Denis Uzio , Ludovic Pinard","doi":"10.1016/j.apcata.2020.117976","DOIUrl":null,"url":null,"abstract":"<div><p>The purpose of this study is to identify the deactivation mechanism(s) that occurs during the aromatization of dilute ethylene at 500 °C on Zn/H-MFI catalyst. More than 15 catalysts, with a Zn/H<sup>+</sup> 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 Brønsted (H<sup>+</sup>) 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 Brønsted acid sites. The best suited descriptor for describing deactivation is the reduction of the micropore volume.</p></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"611 ","pages":"Article 117976"},"PeriodicalIF":4.8000,"publicationDate":"2021-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.apcata.2020.117976","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Catalysis A: General","FirstCategoryId":"1","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0926860X2030569X","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2021/1/5 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 13
Abstract
The purpose of this study is to identify the deactivation mechanism(s) that occurs during the aromatization of dilute ethylene at 500 °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 Brønsted (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 Brønsted acid sites. The best suited descriptor for describing deactivation is the reduction of the micropore volume.
期刊介绍：
Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications.
Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.
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