Different mechanisms of ethane aromatization over Mo/ZSM-5 and Ga/ZSM-5 catalysts
Different mechanisms of ethane aromatization over Mo/ZSM-5 and Ga/ZSM-5 catalysts
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DOI：
10.1016/j.cattod.2020.04.021
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发表时间：
2020-04
期刊：
影响因子：
5.3
通讯作者：
E. Uslamin;H. Saito;Yasushi Sekine;E. Hensen;N. Kosinov
中科院分区：
文献类型：
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作者：
E. Uslamin;H. Saito;Yasushi Sekine;E. Hensen;N. Kosinov
轻质烃的芳构化可以有助于为化学工业提供安全的芳烃供应。在这项工作中，我们研究了改性的ZSM-5分子筛与Ga和Mo的乙烷的活化和芳构化的反应机理的影响。明确的Mo/ZSM-5和Ga/ZSM-5分子筛有效地促进乙烷芳构化为苯-甲苯-二甲苯混合物。这两种催化剂都存在焦炭形成的问题，这导致快速失活。通过催化实验、程序升温表面反应和脉冲反应实验，我们推断乙烷在Ga/ZSM-5上的转化遵循传统的顺序歧化-齐聚-芳构化机理，而在Mo/ZSM-5上的反应涉及活性表面碳（烃池）物种。
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.