Study on the reactivity of In2O3 in mixtures with ammonium-zeolites |
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| Authors: | R. M. Mihályi G. Pál-Borbély H. K. Beyer Ch. Minchev Y. Neinska H. G. Karge |
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| Affiliation: | (1) Central Research Institute of Chemistry, Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025 Budapest, Hungary;(2) Institute of Organic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria;(3) Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany |
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| Abstract: | In ground mixtures of In2O3 and NH4Y, incorporation of In+ cations into the zeolitic phase occurs upon thermal treatment by partial reductive solid-state ion exchange associated with oxidation of ammonium ions or released ammonia to N2 and NH2OH. Cationic InO+ species, created in zeolites by reductive solid-state ion exchange of In2O3/NH4-zeolite mixtures in hydrogen atmosphere and subsequent oxidation of the In+ lattice cations by oxygen, do not undergo autoreduction up to 970 K. Reductive solid-state ion exchange easily proceeds in carbon monoxide atmosphere at temperatures between 620 and 770 K. The significance of these observations for the use of indium-containing zeolites as catalysts is discussed. |
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| Keywords: | In(I)-Y zeolite reductive solid-state ion exchange extra-framework oxygen redox behavior of In-Y zeolites |
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