Zepeda, T.A.; Aguirre, S.; Galindo-Ortega, Y.I.; Solís-Garcia, A.; Navarro Yerga, R.M.; Pawelec, B.; Fierro-Gonzalez, J.C.; Fuentes, S. Hydrogenation of CO2 to Valuable C2-C5 Hydrocarbons on Mn-Promoted High-Surface-Area Iron Catalysts. Catalysts2023, 13, 954.
Zepeda, T.A.; Aguirre, S.; Galindo-Ortega, Y.I.; Solís-Garcia, A.; Navarro Yerga, R.M.; Pawelec, B.; Fierro-Gonzalez, J.C.; Fuentes, S. Hydrogenation of CO2 to Valuable C2-C5 Hydrocarbons on Mn-Promoted High-Surface-Area Iron Catalysts. Catalysts 2023, 13, 954.
Zepeda, T.A.; Aguirre, S.; Galindo-Ortega, Y.I.; Solís-Garcia, A.; Navarro Yerga, R.M.; Pawelec, B.; Fierro-Gonzalez, J.C.; Fuentes, S. Hydrogenation of CO2 to Valuable C2-C5 Hydrocarbons on Mn-Promoted High-Surface-Area Iron Catalysts. Catalysts2023, 13, 954.
Zepeda, T.A.; Aguirre, S.; Galindo-Ortega, Y.I.; Solís-Garcia, A.; Navarro Yerga, R.M.; Pawelec, B.; Fierro-Gonzalez, J.C.; Fuentes, S. Hydrogenation of CO2 to Valuable C2-C5 Hydrocarbons on Mn-Promoted High-Surface-Area Iron Catalysts. Catalysts 2023, 13, 954.
Abstract
Mn-promoted bulk iron catalysts with high specific surface area (82-211 m2.g-1) were synthesized by coprecipitation followed by drying under supercritical conditions. The catalysts were tested in the CO2 hydrogenation reaction. The Mn-promoted iron catalysts showed better textural properties than the bare Fe2O3 catalyst, allowing better dispersion of the active phase, easier reduction of iron oxide, better carburization of iron oxides and higher catalytic activity than the bare Fe2O3 catalyst. The best activity results were obtained by catalyst promotion with a very low amount of Mn (Mn/Fe ratio of 0.05). Upon steady-state conditions (T=340 ºC, total pressure of 20 bar and H2/CO2=3), this catalyst showed high CO2 conversion (44.2%) and selectivity to C2-C4 hydrocarbons (68%, olefin to paraffin ratio of 0.54), while the selectivity to C5+ hydrocarbons, CH4 and CO was about 3.2, 38.5 and 5%, respectively. A close correlation was found between catalyst textural properties and CO2 conversion. The most active MnFe-0.05 catalyst shows high stability during 72 h of reaction related to low amount of soft coke formation and catalyst activation through the formation of χ-Fe5C2 phase during the on-stream reaction.
Keywords
CO2 hydrogenation; CO2 utilization; light hydrocarbons; manganese-iron catalysts, olefin compounds
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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