Effect of the metal promoter on the performances of H-ZSM5 in ethylene aromatization

Abstract : The effect of the metal and the zeolite on the physicochemical properties and catalytic performancesin ethylene aromatization was investigated on M/H-ZSM5 (M = Ni, Mo, Zn and Ga). The addition of themetal to the zeolite increases the amount of Lewis acid sites and in parallel decreased the amount ofBrønsted ones. The extent of the change depended mainly on the location and dispersion of the metalcation, which varied not only with the nature of the metal but also with the one of the metal precursor.The higher Lewis acidity associated with the lowest Brønsted acidity was obtained with the Zn/H-ZSM5catalyst. Ethylene aromatization was studied at 500◦C and atmospheric pressure. For the catalyst series,it was demonstrated that the ethylene conversion and yield in aromatic products were proportionalto the number of Lewis acid sites, except for Ni/H-ZSM5 that presented a singular behavior with a highinitial conversion but rapid deactivation, due to carbon formation. Among the other catalysts, Zn/H-ZSM5led to the highest ethylene conversion and yield in aromatics. An increase in Zn content increased theamount of Lewis acid sites, decreased the amount of Brønsted acid sites, which favored the initial catalyticperformances but also decreased the stability of the Zn/H-ZSM5 catalyst.
Type de document :
Article dans une revue
Catalysis Today, 2017, 289, pp.62 - 69. 〈10.1016/j.cattod.2016.08.006〉
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https://hal-ifp.archives-ouvertes.fr/hal-01581806
Contributeur : Françoise Bertrand <>
Soumis le : mardi 5 septembre 2017 - 10:36:51
Dernière modification le : mardi 15 mai 2018 - 14:50:03

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Hadrien Coqueblin, Anthony Richard, Denis Uzio, Ludovic Pinard, Yannick Pouilloux, et al.. Effect of the metal promoter on the performances of H-ZSM5 in ethylene aromatization. Catalysis Today, 2017, 289, pp.62 - 69. 〈10.1016/j.cattod.2016.08.006〉. 〈hal-01581806〉

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