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Photochemical Engineering and Thermal Transformations of Molybdenum Polyoxometallate Complexes in Aluminosilicate Matrices

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This paper presents results of a study of photochemical and thermal transformations of ammonium heptamolybdate-modified aluminosilicates. The optical density of UV irradiation-induced molybdenum polyoxometallate species increases with increasing porosity and interlayer spacing in the aluminosilicates in going from the zeolite to bentonite, and their chemical structure and properties are determined by the chemical composition of the ammonium heptamolybdate-containing mixtures and the surface chemistry of the solid matrices. The molybdenum polyoxometallates photoinduced in the structure of the aluminosilicates differ in spectral characteristics from irradiated ammonium heptamolybdate solutions containing the additives used, but offer considerably higher stability. In addition, preliminary UV irradiation of the zeolite containing ammonium heptamolybdate complexes occluded in its pores initiates a thermal transformation of polyoxometallate structures, resulting in the formation of Mo2O3 nanoclusters at 300°C and MoO3 nanoclusters at 700°C. UV irradiation of intercalated bentonite first leads to some expansion of interlayer spaces as a result of the formation of molybdenum polyoxometallate clusters, but subsequent heat treatment markedly densifies the structure, which is accompanied by the formation of molybdenum oxide particles in the temperature range 300–700°C and slight amorphization of the mineral.

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Funding

This work was supported by the Belarusian Republican Foundation for Fundamental Research, agreement no. X 19-004.

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Authors and Affiliations

  1. Institute of General and Inorganic Chemistry, Belarusian Academy of Sciences, 220072, Minsk, Belarus

    V. D. Koshevar, V. G. Shkadretsova & I. P. Kazhuro

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  1. V. D. Koshevar
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  2. V. G. Shkadretsova
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  3. I. P. Kazhuro
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Correspondence to V. D. Koshevar.

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Translated by O. Tsarev

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Koshevar, V.D., Shkadretsova, V.G. & Kazhuro, I.P. Photochemical Engineering and Thermal Transformations of Molybdenum Polyoxometallate Complexes in Aluminosilicate Matrices. Inorg Mater 57, 1250–1257 (2021). https://doi.org/10.1134/S0020168521120098

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  • DOI: https://doi.org/10.1134/S0020168521120098

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