Carbon Dioxide Reduction with Hydrogen on Fe, Co Supported Alumina and Carbon Catalysts under Supercritical Conditions

Abstract

Reduction of CO2 with hydrogen into CO was studied for the first time on alumina-supported Co and Fe catalysts under supercritical conditions with the goal to produce either CO or CH4 as the target products. The extremely high selectivity towards methanation close to 100% was found for the Co/Al2O3 catalyst, whereas the Fe/Al2O3 system demonstrates a predominance of hydrogenation to CO with noticeable formation of ethane (up to 15%). The space–time yield can be increased by an order of magnitude by using the supercritical conditions as compared to the gas-phase reactions. Differences in the crystallographic phase features of Fe-containing catalysts cause the reverse water gas shift reaction to form carbon monoxide, whereas the reduced iron phases initiate the Fischer–Tropsch reaction to produce a mixture of hydrocarbons. Direct methanation occurs selectively on Co catalysts. No methanol formation was observed on the studied Fe- and Co-containing catalysts.

Reactive direct air capture of CO2 to C–C coupled products using multifunctional materials

“…64 The Fe-CO interactions were visible in the 1800-2100 cm −1 region, which corresponds to bound CO with different forms of Fe. 65 In addition to formate and CO, there are additional bands visible for carbonates and bicarbonates in the IR spectrum.…”

Zn Doping Effect on the Performance of Fe-Based Catalysts for the Hydrogenation of CO2 to Light Hydrocarbons

“…The CO 2 molecule is extremely stable; therefore, for carrying out chemical reactions, it is necessary to use a heterogeneous catalyst and high-energy reagents, for example, hydrogen [ 6 ]. From this point of view, hydrogenation of CO 2 on heterogeneous catalysts is a simple and convenient way to obtain synthesis gas, hydrocarbons of various structures, methanol, other alcohols, and some oxygenates [ 7 , 8 , 9 , 10 , 11 , 12 ]. Usually, the conversion of CO 2 into value-added products involves two stages: the conversion of CO 2 to CO by a reverse water shift reaction and the further conversion of CO by the Fischer–Tropsch process [ 13 , 14 , 15 ].…”

The Chemistry of Sustainable Energy Conversion and Storage

“…Pant et al adopted a personal computer one-dimensional simulation to validate the possible application of ultrathin layering and the high efficiency of graphene as a back surface field based on a CdTe solar cell [2]. Kustov et al investigated the adoption of aluminasupported Co and Fe catalysts in the reduction of CO 2 with hydrogen into CO under supercritical conditions [3]. It was demonstrated that the differences in the crystallographic phase features of Fe-containing catalysts cause the reverse water gas shift reaction to form carbon monoxide and the reduced iron phases would produce a mixture of hydrocarbons via the Fischer-Tropsch reaction.…”