Abstract: A series of catalysts based on mixed Mn-Zr oxides have been prepared by coprecipitation of nitrates. At low Mn/Zr ratios, the catalysts are single-phase solid solutions (MnyZr1-yO2) based on a ZrO2 structure. An increase in the Mn content leads to an increase in the number of Mn cations in the structure of the solid solutions, but a part of manganese form Mn2O3 and Mn3O4 in crystalline and amorphous states. Reduction of these catalysts with hydrogen was studied by a TPR, in situ XRD, and XPS. The reduction of the solid solutions proceeds via two stages. During the first stage, between 100 and 500oC, Mn cations incorporated into MnyZr1-yO2-δ undergo partial reduction. During the second stage, at temperatures between 500 and 700oC, Mn cations segregate on the surface of the solid solution. In the catalysts with high Mn/Zr ratios, the reduction of manganese oxide was observed: Mn2O3 → Mn3O4 → MnO

Cite: Bulavchenko O.A. , Vinokurov Z.S. , Afonasenko T.N. , Tsyrulʹnikov P.G. , Tsybulya S.V. , Saraev A.A. , Kaichev V.V.
Reduction of Catalysts Based on Mn-Zr Oxides: In situ XPS and XRD Study
In compilation EuropaCat XII. Catalysis: Balancing the use of fossil and renewable resources. XII European Congress on Catalysis, Kazan (Russia), 30 August - 4 September, 2015 : Book of Abstracts. – BIC SB RAS., 2015. – C.767-768. – ISBN 978-5-906376-10-7.

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