Recent Advances in Supported Metal Catalysts and Oxide Catalysts for the Reverse Water-Gas Shift Reaction

Abstract

The reverse water-gas shift reaction (RWGSR), a crucial stage in the conversion of abundant CO 2 into chemicals or hydrocarbon fuels, has attracted extensive attention as a renewable system to synthesize fuels by non-traditional routes. There have been persistent efforts to synthesize catalysts for industrial applications, with attention given to the catalytic activity, CO selectivity, and thermal stability. In this review, we describe the thermodynamics, kinetics, and atomic-level mechanisms of the RWGSR in relation to efficient RWGSR catalysts consisting of supported catalysts and oxide catalysts. In addition, we rationally classify, summarize, and analyze the effects of physicochemical properties, such as the morphologies, compositions, promoting abilities, and presence of strong metal-support interactions (SMSI), on the catalytic performance and CO selectivity in the RWGSR over supported catalysts. Regarding oxide catalysts (i.e., pure oxides, spinel, solid solution, and perovskite-type oxides), we emphasize the relationships among their surface structure, oxygen storage capacity (OSC), and catalytic performance in the RWGSR. Furthermore, the abilities of perovskite-type oxides to enhance the RWGSR with chemical looping cycles (RWGSR-CL) are systematically illustrated. These systematic introductions shed light on development of catalysts with high performance in RWGSR.

Boosting the performance of Ni/Al2O3 for the reverse water gas shift reaction through formation of CuNi nanoalloys

“…Therefore, the active surface area decreases over time, as it was later confirmed by The reaction mechanism involved in the rWGS reaction is still unclear. However, based on experimental and theoretical studies, two main routes were proposed: (i) via redox mechanism [99][100][101][102] and (ii) via an associative route with formate as intermediate [103][104][105][106] . The surface redox mechanism involves the adsorption of CO 2 on the metallic active site and the oxidation of the active centres, leading to CO formation.…”

Mechanistic and multiscale aspects of thermo-catalytic CO2conversion to C1products

“…Several supported metals including Pd, 123,124 Pt, 100,[125][126][127] Rh, [128][129][130] Au, 122,131,132 Fe, 133,134 Ni, 47,94,135 and Cu, 136,137 have been reported as active catalysts for the RWGS reaction. In addition, supported metal alloys, such as Pd-In/SiO 2 , 138 125 namely the redox mechanism [142][143][144] and carboxyl (COOH*) mechanism.…”

Review of CO2 Reduction on Supported Metals (Alloys) and Single-Atom Catalysts (SACs) for the Use of Green Hydrogen in Power-to-Gas Concepts

“…In general, we see that methanation is thermodynamically more favorable at lower temperatures than CO formation. This primarily determines the working temperatures of the desired catalytic reaction, in which methanation (Sabatier pathway) or CO formation via RWGS should be operated [22]. These thermodynamic conditions should always precede a reaction design, as the catalyst can only change the chemical kinetics.…”