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The Effect of Calcination Gas Atmosphere on the Structural Organization of Ru/Ce0.75Zr0.25O2 Catalysts for CO2 Methanation Full article

Journal Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757
Output data Year: 2024, Volume: 702, Number: 1, Article number : 134962, Pages count : 11 DOI: 10.1016/j.colsurfa.2024.134962
Tags Ruthenium; CO2 methanation; Metal dispersion; Structure; MSI; Interface
Authors Pakharukova Vera P. 1,2 , Kharchenko Nadezhda A. 1,2 , Stonkus Olga A. 1 , Saraev Andrey A. 1 , Gorlova Anna M. 1 , Rogozhnikov Vladimir N. 1 , Potemkin Dmitry I. 1,2
Affiliations
1 Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva 5, Novosibirsk 630090, Russia
2 Novosibirsk State University, Pirogova Street 2, Novosibirsk 630090, Russia

Funding (1)

1 Russian Science Foundation 21-73-20075

Abstract: In this study, supported 5 wt% Ru/Ce0.75Zr0.25O2 catalysts were prepared by sorption-hydrolytic deposition technique, followed by calcination under different conditions, namely in reductive H2/N2 (Ru/CeZr_red) and oxidative air (Ru/CeZr_ox) atmospheres. A thorough characterization of the catalysts was carried out by XRD, CO chemisorption, HRTEM, Raman spectroscopy, XPS, and in situ DRIFTS. The findings showed that the choice of the calcination atmosphere has a great impact on the structural organization of the catalyst. Calcination in air results in the formation of the larger crystalline RuO2 particles, which tend to enlarge upon reduction under CO2 methanation conditions. The reductive treatment results in a much higher dispersion of supported Ru species and a more pronounced metal-support interaction (MSI). In the Ru/CeZr_red catalyst, a large amount of atomic scale Ru species was detected along with metallic Ru nanoparticles and clusters. However, it was found that the superiority of the Ru/CeZr_red catalyst in the Ru dispersion did not result in the significant advantage in the CO2 methanation activity. In situ DRIFTS results suggested that the MSI affects the ability of Ru species to adsorb and activate reagent molecules, in particular, enhances the adsorption strength of the intermediate CO species.
Cite: Pakharukova V.P. , Kharchenko N.A. , Stonkus O.A. , Saraev A.A. , Gorlova A.M. , Rogozhnikov V.N. , Potemkin D.I.
The Effect of Calcination Gas Atmosphere on the Structural Organization of Ru/Ce0.75Zr0.25O2 Catalysts for CO2 Methanation
Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2024. V.702. N1. 134962 :1-11. DOI: 10.1016/j.colsurfa.2024.134962 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: Jun 7, 2024
Accepted: Jul 29, 2024
Published online: Jul 31, 2024
Published print: Dec 1, 2024
Identifiers:
Web of science: WOS:001290417200001
Scopus: 2-s2.0-85200443338
Elibrary: 74406840
Chemical Abstracts: 2024:1724394
OpenAlex: W4401198890
Citing: Пока нет цитирований
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