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Effect of the Conditions of Solution Combustion Synthesis on the Properties of Monolithic Pt–MnOx Catalysts for Deep Oxidation of Hydrocarbons

Authors
  • Shikina, N. V.1
  • Yashnik, S. A.1
  • Gavrilova, A. A.1
  • Nikolaeva, O. A.1
  • Dovlitova, L. S.1
  • Ishchenko, A. V.1
  • Ismagilov, Z. R.1, 2
  • 1 Federal Research Center Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia , Novosibirsk (Russia)
  • 2 Federal Research Center for Coal and Coal Chemistry, Institute of Coal Chemistry and Chemical Materials Science, Siberian Branch, Russian Academy of Sciences, Kemerovo, 650000, Russia , Kemerovo (Russia)
Type
Published Article
Journal
Kinetics and Catalysis
Publisher
Pleiades Publishing
Publication Date
Sep 01, 2020
Volume
61
Issue
5
Pages
809–823
Identifiers
DOI: 10.1134/S0023158420050110
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractCatalysts based on manganese oxides, doped with Pt, and supported on ceramic monoliths with a honeycomb structure were produced by impregnation and solution combustion synthesis (SCS). In SCS, glycine was used as a fuel additive, ensuring different conditions of the combustion of depleted (φ < 1) and enriched (φ > 1) fuel mixtures. The catalysts were studied by TGA, XRD, HRTEM, TPR-H2, BET, and differential dissolution. The catalytic properties of the samples were investigated in the deep oxidation of butane and methane. It was shown that, under SCS conditions, the active components form as a finely dispersed particles of metallic platinum and manganese oxides Mn3O4 in the near-surface layers of the support. Unlike this, after the thermal treatment of the impregnated catalyst, the formed manganese oxides are enriched with Mn(IV) cations and primarily localized in the bulk of the support, forming with it an interaction phase. The high activity of the SCS catalysts in the oxidation of butane and methane is manly determined by the presence of reduced forms of manganese oxide and the accessibility of the active components for the reactants in the near-surface layers of the support.

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