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RAS Chemistry & Material ScienceКинетика и катализ Kinetics and Catalysis

  • ISSN (Print) 0453-8811
  • ISSN (Online) 3034-5413

MNOX/ZRO2–CEO2 catalysts for CO and propane oxidation: the effect of manganese content

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PII
S30345413S0453881125010015-1
DOI
10.7868/S3034541325010015
Publication type
Article
Status
Published
Authors
T. N. Afonasenko
  • Affiliation: Institute of Catalysis SB RAS
O. A. Bulavchenko
  • Affiliation: Institute of Catalysis SB RAS
Volume/ Edition
Volume 66 / Issue number 1
Pages
3-18
Abstract
The effect of the content of supported manganese on the structural properties and activity in the oxidation reactions of CO and propane for the MnОx/Zr0.4Ce0.6 catalysts prepared by the impregnation method has been studied. It was found that an increase in manganese content to 3.6% wt. (molar ratio Mn/(Zr + Ce) ≤ 0.1) leads to an increase in the catalytic activity of MnОx/Zr0.4Ce0.6 in oxidation reactions. In the case of a higher manganese concentration, the activity changes slightly. According to the XRD, TPR-H2, XPS and EPR, an increase in the amount of supported manganese for samples with Mn/(Zr + Ce) ≤ 0.1 is accompanied by a change in the lattice constant of the support, an increase in the amount of weakly bound oxygen, as well as the quantity of oxygen vacancies in the structure of cerium oxide. These changes are due to the incorporation of manganese into the structure of the support and the possible formation of highly dispersed particles of MnОx on its surface which ensures an increase in catalytic activity. Stabilization of catalytic activity with a further increase in the amount of supported manganese correlates with a slight change in the amount of weakly bound oxygen and oxygen vacancies of the support due to the appearance and subsequent increase in the content of the less active Mn2O3 phase.
Keywords
катализаторы MnO<sub>x</sub>/ZrO<sub>2</sub>–CeO<sub>2</sub> окисление СО окисление пропана<sub></sub>
Date of publication
21.11.2025
Year of publication
2025
Number of purchasers
0
Views
18

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