Sciact
  • EN
  • RU

Operando X-ray Diffraction Study of Mn–Ce Catalysts for CO Oxidation Full article

Journal Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques
ISSN: 1027-4510 , E-ISSN: 1819-7094
Output data Year: 2023, Volume: 17, Number: 3, Pages: 694–700 Pages count : 7 DOI: 10.1134/s1027451023030345
Tags cerium oxide, manganese oxide, (Mn,Ce)O2, operando X-ray powder diffraction, CO oxidation
Authors Vinokurov Z.S. 1,2 , Afonasenko T.N. 3 , Mishchenko D.D. 1,2 , Saraev A.A. 1,2 , Aydakov E.E. 1 , Rogov V.A. 1 , Bulavchenko O.A. 1
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2 Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Kol’tsovo, 630559 Russia
3 Center of New Chemical Technologies, Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Omsk, 644040 Russia

Funding (1)

1 Russian Science Foundation 21-73-10218

Abstract: We prepare a series of MnOx–CeO2 catalysts with a molar ratio of Mn : Ce = 3 : 7 by coprecipitation and varying the calcination temperature from 300 to 800°C. The catalysts are characterized by powder X-ray diffraction, low-temperature nitrogen adsorption, and X-ray photoelectron spectroscopy, and the catalytic activity of all samples is tested in the CO oxidation reaction. A (Mn,Ce)O2 solid solution with the fluorite structure forms in all catalysts. Based on the studies performed, a catalyst calcined at 600°C is selected for further studies of the effect of topochemical reduction on the catalytic activity in the CO oxidation reaction by X-ray diffraction in the operando mode. The experiment is carried out sequentially in a stepwise mode: stepwise heating/cooling in a reaction mixture of 1% CO + 2% O2 in the mode 150–175–200–175–150°C (stages 1, 3, and 5); reduction of the sample in a mixture of 10% CO + He at 400°C (stage 2); reduction of the sample in a mixture of 10% H2 + He at 400°С (stage 4). The reductive treatment leads to segregation of the initial (Mn,Ce)O2 solid solution and the appearance of dispersed manganese oxides on the surface, while enrichment of the surface with manganese oxide increases its activity in the CO oxidation reaction.
Cite: Vinokurov Z.S. , Afonasenko T.N. , Mishchenko D.D. , Saraev A.A. , Aydakov E.E. , Rogov V.A. , Bulavchenko O.A.
Operando X-ray Diffraction Study of Mn–Ce Catalysts for CO Oxidation
Journal of Surface Investigation: X-Ray, Synchrotron and Neutron Techniques. 2023. V.17. N3. P.694–700. DOI: 10.1134/s1027451023030345 WOS Scopus РИНЦ ANCAN OpenAlex
Original: Винокуров З.С. , Афонасенко Т.Н. , Мищенко Д.Д. , Сараев А.А. , Айдаков Е.Е. , Рогов В.А. , Булавченко О.А.
Operando дифракционное исследование Mn–Ce катализаторов окисления СО
Поверхность. Рентгеновские, синхротронные и нейтронные исследования. 2023. №6. С.74-80. DOI: 10.31857/S1028096023060171 РИНЦ OpenAlex
Dates:
Submitted: Oct 15, 2022
Accepted: Dec 14, 2022
Published print: Jun 16, 2023
Published online: Jun 16, 2023
Identifiers:
Web of science: WOS:001009238900025
Scopus: 2-s2.0-85161996128
Elibrary: 54088660
Chemical Abstracts: 2023:1257164
Chemical Abstracts (print): 183:219964
OpenAlex: W4380884485
Citing: Пока нет цитирований
Altmetrics: