Fe-based catalysts on cellulose-derived carbon towards low-temperature RWGS

Azancot, L. (Universidad de Zaragoza) ; Tarifa, P. (Universidad de Zaragoza) ; Cazaña, F. ; Monzón, A. (Universidad de Zaragoza)

Resumen: The RWGS reaction is a key pathway for converting CO2 into CO, a crucial intermediate to produce synthetic fuels and chemicals. Optimizing RWGS catalysts to enhance CO selectivity at lower temperatures facilitates integration with downstream processes such as Fischer-Tropsch synthesis. This study investigates the promotional effects of Mo, Cr, Mn, and Ce on Fe/CDC catalysts for RWGS. The catalysts were synthesized using cellulose as a biotemplate, yielding Fe/cellulose-derived carbon (Fe/CDC) catalysts. The catalysts were characterized by analyzing metal dispersion, metal-support interactions, and CO2 adsorption properties. The results for the different promoters indicate that Fe-Cr forms alloys, Fe-O-Mo species are generated, while Fe-Mn and Fe-Ce promote strong Fe-Me interactions through surface migration of the promoter. The Fe/CDC catalyst exhibited the highest CO2 conversion but the lowest CO selectivity. In contrast, Fe-Ce/CDC and Fe-Mn/CDC, which exhibit higher basicity, showed lower CO2 conversion but higher CO selectivity. This behavior is likely due to strong CO2 adsorption, which inhibits the reaction, as well as lower surface exposure of Fe, given that Ce and Mn cover Fe active sites, further affecting catalytic performance. Conversely, Fe-Mo/CDC, which has intermediate basicity, achieved the highest CO selectivity despite a lower CO2 conversion compared to the unpromoted catalyst. This suggests that Mo, not only influences adsorption properties, but also induces electronic effects through Fe-O-Mo species, promoting CO formation. These findings highlight Fe-Mo/CDC as a promising catalyst for low-temperature RWGS. Further studies are needed to elucidate the specific role of Mo in Fe-based catalysts and to optimize its catalytic performance.

Idioma: Inglés

DOI: 10.1016/j.biombioe.2025.107894

Año: 2025

Publicado en: BIOMASS & BIOENERGY 199 (2025), 107894 [10 pp.]
ISSN: 0961-9534

Financiación: info:eu-repo/grantAgreement/ES/MICIU/JDC2022-048904-I
Financiación: info:eu-repo/grantAgreement/ES/MICIU/PID2020-113809RB-C31
Financiación: info:eu-repo/grantAgreement/ES/MICIU/PID2023-147861OB-C21

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)