EFFECT OF THE ORDER OF APPLICATION OF COPPER AND ZINC COMPOUNDS ON CATALYTIC ACTIVITY IN COOXIDATION REACTION

J.V. Aleksandrova, A.Y. Postnov, V.N. Naraev
DOI: 10.25699/SSSB.2021.40.6.017 Download PDF
Abstract: A series of copper-zinc-containing catalysts was synthesized on the aluminum - chromium oxides base by the extraction -pyrolytic method (EPM), the effect of the order application active components (copper and zinc) on the qualitative and quantitative composition of the formed phases, as well as the depth of placement in the granules of the baser, structural strength and catalytic properties of samples during oxidation with air oxygen was analyzed. The calculated values of the activation energy and the pre-exponential multiplier showed that the order of application active components has an effect on the kinetic parameters: the best results are observed in samples obtained by joint impregnation of an alumochrome carrier. The rate constants oxidation CO (k) calculated over the entire temperature range are more than 2 times higher when the components added together. Using electron probe microanalysis, the surface texture of the EPM catalysts was studied, it was found that, despite the order of application, the EPM technology allows to obtain a homogeneous texture - the surface of the catalysts is characterized by layering with particles of a scaly structure with a minimum particle size of 0.4 microns in all cases, and maximum 3-4 microns. The joint application of Zn and Cu ensures an even distribution of the components over the cross section of the catalyst granules. The results of the work can be applied to build a technology of effective copper-zinc catalysts for oxidation processes. The scope of application of catalysts is complex purification of multicomponent gas mixtures.
Index terms: aluminum - chromium base, impregnation method, pyrolysis, extraction, oxidation of CO.

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