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

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

扫码查看
原文链接
  • NETL
  • NSTL
  • Elsevier
The RWGS reaction is a key pathway for converting CO_2 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 CO_2 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 CO_2 conversion but the lowest CO selectivity. In contrast, Fe-Ce/CDC and Fe-Mn/CDC, which exhibit higher basicity, showed lower CO_2 conversion but higher CO selectivity. This behavior is likely due to strong CO_2 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 CO_2 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.

Fe doped catalystsCellulose derived carbonReverse water gas shiftBasicity

L. Azancot、P. Tarifa、F. Cazaiia、A. Monzon

展开 >

Institute de Nanociencia y Materiales de Aragbn (INMA), CSIC-U. de Zaragoza. C/Mariano Esquillor s/n, 50018, Zaragoza, Spain

Laboratorio de Microscopias Avanzadas, Universidad de Zaragoza, C/Mariano Esquillor s/n, 50018, Zaragoza, Spain

2025

10.1016/j.biombioe.2025.107894

Biomass & bioenergy

Biomass & bioenergy

SCI
ISSN：0961-9534
年,卷(期)：2025.199(Aug.)
  • 39