MIL-100(Fe)-derived catalysts for CO2 conversion via low- and high-temperature reverse water-gas shift reaction

Jesús Gandara Loe; Alejandro Pinzón Peña; Juan Luis Martin Espejo; Luis F Bobadilla; Tomás Ramírez Reina; Laura Pastor-Pérez

doi:10.1016/j.heliyon.2023.e16070

MIL-100(Fe)-derived catalysts for CO₂ conversion via low- and high-temperature reverse water-gas shift reaction

Heliyon. 2023 May 6;9(5):e16070. doi: 10.1016/j.heliyon.2023.e16070. eCollection 2023 May.

Authors

Jesús Gandara Loe¹, Alejandro Pinzón Peña¹, Juan Luis Martin Espejo¹, Luis F Bobadilla¹, Tomás Ramírez Reina^{1

2}, Laura Pastor-Pérez^{1

2}

Affiliations

¹ Departamento de Química Inorgánica e Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC - Universidad de Sevilla, Av. Américo Vespucio 49, 41092, Sevilla, Spain.
² Department of Chemical and Process Engineering, University of Surrey, Guildford, GU2 7XH, UK.

Abstract

Fe-derived catalysts were synthesized by the pyrolysis of MIL-100 (Fe) metal-organic framework (MOF) and evaluated in the reverse water-gas shift (RWGS) reaction. The addition of Rh as a dopant by in-situ incorporation during the synthesis and wet impregnation was also considered. Our characterization data showed that the main active phase was a mixture of α-Fe, Fe₃C, and Fe₃O₄ in all the catalysts evaluated. Additionally, small Rh loading leads to a decrease in the particle size in the active phase. Despite all three catalysts showing commendable CO selectivity levels, the C@Fe* catalyst showed the most promising performance at a temperature below 500 °C, attributed to the in-situ incorporation of Rh during the synthesis. Overall, this work showcases a strategy for designing novel Fe MOF-derived catalysts for RWGS reaction, opening new research opportunities for CO₂ utilization schemes.

Keywords: CO2 conversion; Fe-based catalysts; MOF-derived catalysts; RWGS reaction.