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State and properties of ion-exchanged cations in zeolites: 2. IR spectra and chemical activation of adsorbed methane

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Abstract

Methane adsorption by hydrogen and cationic forms of various zeolites has been investigated by diffuse reflectance IR spectroscopy. In methane adsorption on faujasites, protons, univalent alkali metal cations, and divalent alkaline-earth cations exert similar perturbation and polarization effects on the methane molecule. Adsorbed methane in high-silica zeolites is perturbed by alkaline-earth cations somewhat more strongly than in faujasites and still more strongly by divalent transition metal cations. In the latter case, as in hydrogen adsorption, which was considered in the previous report, the interaction between methane and the zinc form of zeolite ZSM-5 at elevated temperatures causes the heterolytic dissociative adsorption of methane with the formation of methyl fragments and acidic hydroxyl groups bound to zinc ions.

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Authors and Affiliations

  1. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia

    V. B. Kazansky

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  1. V. B. Kazansky
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Correspondence to V. B. Kazansky.

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Original Russian Text © V.B. Kazansky, 2014, published in Kinetika i Kataliz, 2014, Vol. 55, No. 6, pp. 756–766.

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Kazansky, V.B. State and properties of ion-exchanged cations in zeolites: 2. IR spectra and chemical activation of adsorbed methane. Kinet Catal 55, 737–747 (2014). https://doi.org/10.1134/S0023158414060081

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  • DOI: https://doi.org/10.1134/S0023158414060081

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