Abstract: A novel highly efficient and stable for many cycles catalyst (1% Со-ZSM-5(17)) for water oxidation was developed using the method of polycondensation for stabilization of oxo/hydroxo complexes of cobalt (II, III) and nanosize Co3O4 in zeolite channels. In a weak-alkaline medium (pH 8.0, 9.2, 10.0) in the presence of a one-electron oxidant (Ru(bpy)33+), the catalyst provided the yield of oxygen as high as 56, 73 и 78% of the stoichiometric quantity, respectively. Catalysts based on ZSM-5 zeolite exhibited higher catalytic activity as compared to the catalysts based on the MOR, BEA, Y. Inspection of the electron states of cobalt in the Co-containing zeolite-based catalysts using TPR-H2 and UV–Vis DR techniques revealed that α-Co(OH)2-like polynuclear clusters and hydrocomplexes stabilized in the zeolite channels were most active to catalytic oxidation of water, while their transformation to Co3O4-like clusters/nanoparticles and Co2+ oxocomplexes, respectively, during thermal treatment led to some decrease in the catalyst efficiency. Coarsening of Co3O4-like clusters/nanoparticles caused the further decrease in the system efficiency. The minimal activity was observed with the catalysts containing predominantly isolated Co2 +Oh ions. The result obtained indicates a kind of at least polynuclear structure of the catalytically active center ConOx, where n > 2.

Cite: Yashnik S.A. , Chikunov A.S. , Taran O.P. , Salnikov A.V. , Parmon V.N.
Co(II, III) Hydroxides Supported on Zeolite Acting as an Efficient and Robust Catalyst for Catalytic Water Oxidation with Ru(bpy)33+
Topics in Catalysis. 2019. V.62. N5-6. P.439-455. DOI: 10.1007/s11244-019-01158-1 WOS Scopus РИНЦ AN OpenAlex

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Dates:

Published online:	Mar 16, 2019
Published print:	Jun 1, 2019

Identifiers:

Web of science:	WOS:000473213000003
Scopus:	2-s2.0-85063079724
Elibrary:	41874473
Chemical Abstracts:	2019:672367
OpenAlex:	W2921871997

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Scopus	2
Web of science	2
Elibrary	1
OpenAlex	2

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