4.7 Article

Different mechanisms of ethane aromatization over Mo/ZSM-5 and Ga/ZSM-5 catalysts

期刊

CATALYSIS TODAY
卷 369, 期 -, 页码 184-192

出版社

ELSEVIER
DOI: 10.1016/j.cattod.2020.04.021

关键词

Ethane; Aromatics; Mo; ZSM-5; Ga; ZSM-5; Mechanism

资金

  1. Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), an NWO Gravitation programme - Ministry of Education, Culture and Science of the government of the Netherlands

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The modification of ZSM-5 zeolite with Ga and Mo enhances the aromatization of ethane, resulting in the formation of benzene-toluene-xylene mixtures. However, both catalysts suffer from coke formation, leading to rapid deactivation.
Aromatization of light hydrocarbons can contribute to a secure supply of aromatics for the chemical industry. In this work, we investigate the influence of modification of zeolite ZSM-5 with Ga and Mo on the reaction mechanism underlying the activation and aromatization of ethane. Well-defined Mo/ZSM-5 and Ga/ZSM-5 zeolites efficiently promote ethane aromatization to benzene-toluene-xylene mixtures. Both catalysts suffer from coke formation, which leads to rapid deactivation. From catalytic tests, temperature-programmed surface reaction and pulsed reaction experiments, we infer that ethane conversion on Ga/ZSM-5 follows a conventional sequential dehydrogenation-oligomerization-aromatization mechanism, while the reaction over Mo/ZSM-5 involves reactive surface carbon (hydrocarbon pool) species.

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