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Methanation of CO2 on bulk Co–Fe catalysts

Methanation of CO2 on bulk Co–Fe catalysts

Authors :
Anna V. Vakaliuk
Ivan Saldan
Vitaliy E. Diyuk
Olena V. Ischenko
Tore Ericsson
Vladyslav V. Lisnyak
Oksana Makota
Lennart Häggström
A. G. Dyachenko
A. V. Yatsymyrskyi
Snizhana V. Gaidai
Tetiana M. Zakharova
Source :
International Journal of Hydrogen Energy. 46:37860-37871
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

The efficiency of CO2 methanation was estimated through gas chromatography in the presence of Co–Fe catalysts. Scanning electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, and Mossbauer spectroscopy were applied for ex-situ analysis of the catalysts after their test in the methanation reaction. Thermal programmed desorption mass spectroscopy experiments were performed to identify gaseous species adsorbed at the catalyst surface. Based on the experimental results, surface reaction model of CO2 methanation on Co–Fe catalysts was proposed to specify active ensemble of metallic atoms at the catalyst surface, orientation of adsorbed CO2 molecule on the ensemble and detailed reaction mechanism of CO2→CH4 conversion. The reaction step when OH group in the FeOOH complex recombined with the H atom adsorbed at the active ensemble to form H2O molecule was considered as the rate-limiting step.

Details

ISSN :
03603199
Volume :
46
Database :
OpenAIRE
Journal :
International Journal of Hydrogen Energy
Accession number :
edsair.doi...........715f30e16d88ec9eacbca62c9d59f2c1
Full Text :
https://doi.org/10.1016/j.ijhydene.2021.09.034