Deciphering the role of dopants (Mn, Co, and Cu) in Ni-based CO2 methanation catalysts
(2026) Applied Catalysis A: General — Vol. 718, p. 120907 (2026)
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- Abstract
- CO2 methanation is effectively catalyzed by Ni-based catalysts and doping is widely applied to further enhance performance. Deciphering the role of the promoter and the mechanism of promotion is of great meaning for the development of highly active catalysts. Herein, a series of model catalysts was prepared to address this challenge. Compared to Ni/SiO2, the Mn-doped and Co-doped catalysts showed higher methanation activity. On the contrary, the Cu-modified catalyst showed lower performance. A comprehensive characterization study suggests that the effect of promoters is to orient the reaction mechanism and favor the conversion of key intermediates. Mn addition promotes the hydrogenation of the formaldehyde intermediate to the methoxy intermediate, which is the rate determining step of the RWGS+CO hydrogenation pathway (being dominant at low temperature, below 250 °C). Co addition facilitates the formation of formate species, which is the rate determining step of the formate pathway (proceeding in parallel with RWGS+CO hydrogenation pathway). Cu addition has a negative effect on the rate determining step of those two pathways.
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Citations
Zhao, Y., Casale, S., Sassoye, C., & Debecker, D. (2026). Deciphering the role of dopants (Mn, Co, and Cu) in Ni-based CO2 methanation catalysts. Applied Catalysis A: General, 718, 120907. https://doi.org/10.1016/j.apcata.2026.120907 (Original work published 2026)