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Synthesis and Physicochemical Properties of Complex Oxides K2MexTi8–xO16 (Me = Mg, Ni, Al) of Hollandite Structure

  • Inorganic Synthesis and Industrial Inorganic Chemistry
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Abstract

Materials of the hollandite structure in the K2O–MeO(Mе2O3)–TiO2 (Ме = Al, Ni, Mg) system, synthesized by two methods (solid-phase synthesis and pyrolysis of citrate–nitrate compositions), were studied. The pyrolysis, compared to the traditional solid-phase synthesis, yielded the materials with the more developed specific surface and, as a consequence, enhanced performance in sorption of a model dye, Methylene Blue (for K2MgTi7O16, q = 18.75 mg g–1). The K2Al2Ti6O16 sample, also prepared by pyrolysis, showed the highest catalytic performance in oxidation of СО and Н2. The hydrogen oxidation on this catalyst occurred to 95% at 355°С with the performance of ~0.21 × 10–5 mol g–1 s–1, which is two times higher compared to the sample of the same composition prepared by the solid-phase method. The hollandites show promise as sorbents and catalysts for gas treatment.

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ACKNOWLEDGMENTS

The authors are grateful to Researcher N.Yu. Ul’yanova and Junior Researcher E.Yu. Brazovskaya for the assistance in studying the textural and optical characteristics of the samples (Institute of Silicate Chemistry, Russian Academy of Sciences), and also to T.A. Vishnevskaya and G.A. Galkina, who performed trials of the samples in oxidation of СО and Н2 [engineers of the St. Petersburg State Institute of Technology (Technical University), Chair of General Chemical Technology and Catalysis].

Funding

The study was performed within the framework of the government assignment for the Institute of Silicate Chemistry, Russian Academy of Sciences in accordance with the Basic Research Program of State Academies of Sciences for 2019–2021 (theme no. 0097-2019-0012).

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Authors and Affiliations

  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    N. V. Besprozvannykh, O. Yu. Sinel’shchikova, N. A. Morozov & S. K. Kuchaeva

  2. St. Petersburg State Institute of Technology (Technical University), 190015, St. Petersburg, Russia

    A. Yu. Postnov

Authors
  1. N. V. Besprozvannykh
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  2. O. Yu. Sinel’shchikova
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  3. N. A. Morozov
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  4. S. K. Kuchaeva
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  5. A. Yu. Postnov
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Correspondence to N. V. Besprozvannykh or O. Yu. Sinel’shchikova.

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Besprozvannykh, N.V., Sinel’shchikova, O.Y., Morozov, N.A. et al. Synthesis and Physicochemical Properties of Complex Oxides K2MexTi8–xO16 (Me = Mg, Ni, Al) of Hollandite Structure. Russ J Appl Chem 93, 1132–1138 (2020). https://doi.org/10.1134/S1070427220080042

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