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Catalytic Properties and Chemical Stability of Potassium Polyferrites with Additives of Quadruply Charged Cations

  • CATALYSIS IN CHEMICAL AND PETROCHEMICAL INDUSTRY
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Abstract

A study is performed of the effect of additives of quadruply charged ions on the composition, chemical stability, and catalytic properties of samples of potassium polyferrites with a β″-alumina type structure of \({{{\text{K}}}_{{\text{2}}}}{\text{Fe}}_{{{\text{1 + }}q}}^{{{\text{II}}}}{\text{Fe}}_{{{\text{10}} - {\text{2}}q}}^{{{\text{III}}}}{\text{Me}}_{q}^{{{\text{IV}}}}{{{\text{O}}}_{{{\text{17}}}}}\), where Me is Ce, Ti, or Zr, and q = 0–1.0. The mechanism is determined for the effect produced by the additives of quadruply charged cations on the activity, selectivity, and corrosion resistance of β″-potassium polyferrite is determined. Polyferrites doped with quadruply charged cations are characterized by a drop in the specific rate of styrene formation and an increase in ethyl benzene dehydrogenation selectivity. The destabilizing effect of titanium additives is revealed. It is expressed in facilitating the emission of an alkali metal from the crystal lattice of polyferrite. Cerium additives result in the destruction of the polyferrite structure due to the reduction of Ce4+→ Be3+ for values of parameter q greater than 0.6. Zirconium additives do not reduce the corrosion resistance of ferrite systems under the conditions of dehydrogenation.

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  1. Yaroslavl State Technical University, 150023, Yaroslavl, Russia

    L.G. Anikanova & N.V. Dvoretskii

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  1. L.G. Anikanova
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  2. N.V. Dvoretskii
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Correspondence to L.G. Anikanova or N.V. Dvoretskii.

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Anikanova, L., Dvoretskii, N. Catalytic Properties and Chemical Stability of Potassium Polyferrites with Additives of Quadruply Charged Cations. Catal. Ind. 13, 373–377 (2021). https://doi.org/10.1134/S2070050421040024

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  • DOI: https://doi.org/10.1134/S2070050421040024

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