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Topics in Catalysis
Erschienen in: Topics in Catalysis 15-18/2020

30.06.2020 | Original Paper

Mechanism and Kinetics of Ethane Aromatization According to the Chemical Transient Analysis

verfasst von: Siavash Fadaeerayeni, Genwei Chen, Hossein Toghiani, Yizhi Xiang

Erschienen in: Topics in Catalysis | Ausgabe 15-18/2020

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Abstract

The need for on-purpose techniques for the conversion of cheaper and abundant light alkanes to petrochemical products has revitalized research interests on light alkanes aromatization. Here ethane/propane aromatization and ethylene oligomerization over the representative Zn-HZSM-5 and Pt/HZSM-5 catalysts have been studied by the step-perturbation transients to provide insight into the kinetics and mechanisms leading to higher olefins and aromatics formation from ethane aromatization. The time-dependent catalytic behavior during the build-up and back-transient between ethane and inert, ethane and propane, as well as ethylene and inert, has been extensively discussed. We suggested that the hydrocarbon-pool mechanism be involved once ethylene was produced from the dehydrogenation of ethane. The oligomerization/cracking, cyclization, and dehydrogenation/hydride transfer reactions involved with the hydrocarbon-pool species reach the thermodynamic equilibrium quickly. The initial ethane dehydrogenation and the final formation of aromatics from their corresponding intermediates are slow surface-reactions. The rate constants k for benzene, toluene, and xylene formation from the “lumped hydrocarbon-pool” have been evaluated based on the first-order kinetic model of the back-transient. The rate constants k for aromatics over the Pt0 clusters/particles in the Pt/HZSM-5 are ⁓ 20–30% higher than that over the Zn (II) cations in the Zn-HZSM-5 catalyst.
Vorheriger Artikel Nickel-Catalysed Vapour-Phase Hydrogenation of Furfural, Insights into Reactivity and Deactivation
Nächster Artikel Thermal Aging of Perovskite Based Natural Gas Vehicle Catalysts: Dependency of the Mode of Pd Incorporation

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Metadaten
Titel
Mechanism and Kinetics of Ethane Aromatization According to the Chemical Transient Analysis
verfasst von
Siavash Fadaeerayeni
Genwei Chen
Hossein Toghiani
Yizhi Xiang
Publikationsdatum
30.06.2020
Verlag
Springer US
Erschienen in
Topics in Catalysis / Ausgabe 15-18/2020
Print ISSN: 1022-5528
Elektronische ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-020-01303-1

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