Methanation of CO 2 on bulk Co-Fe catalysts

• Published in: International journal of hydrogen energy 2021, Vol.46 (76), p.37860
• Main Authors: Ischenko, Olena V., Dyachenko, Alla G., Saldan, Ivan, Lisnyak, Vladyslav V., Diyuk, Vitaliy E., Vakaliuk, Anna V., Yatsymyrskyi, Andrii V., Gaidai, Snizhana V., Zakharova, Tetiana M., Makota, Oksana, Ericsson, Tore, Häggström, Lennart
• Format: Article
• Language: English
• Subjects: Catalyst efficiency; Co-Fe catalysts; Sabatier reaction; Surface reaction model
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2021.09.034

The efficiency of CO 2 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 Mössbauer 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 CO 2 methanation on Co–Fe catalysts was proposed to specify active ensemble of metallic atoms at the catalyst surface, orientation of adsorbed CO 2 molecule on the ensemble and detailed reaction mechanism of CO 2 →CH 4 conversion. The reaction step when OH group in the FeOOH complex recombined with the H atom adsorbed at the active ensemble to form H 2 O molecule was considered as the rate-limiting step.