| Abstract | Ni nanoparticles (NPs) supported on Al₂O₃, ZnO, Fe₂O₃ and Co₃O₄ activate CO₂ for the reverse water–gas shift (RWGS) reaction at ambient pressure. The highly dispersed Ni NPs at a loading of 0.02 g g⁻¹ minimized agglomeration and hydrogen adsorption to the surface, thus CO hydrogenation. Irreducible (Al₂O₃, ZnO) and reducible (Fe₂O₃, Co₃O₄) supports promoted the catalytic properties of Ni. The metal-support interaction (MSI) between Ni and semi-conductors ZnO and Co₃O₄ suppresses CH₄ formation, increases the selectivity towards the RWGS, and promotes the catalytic activity and stability of Ni. Carbon nanotubes (CNTs) formed during the reaction dispersed Ni/Co₃O₄ and promoted its catalytic properties by forming a synergistic relationship between Ni/Co₃O₄ and CNTs. Ni/Co₃O₄ converted the most CO2 among all catalysts at ∼ 36% of CO2 with traces of CH₄, while Ni/Al₂O₃ converted ∼ 33% with a ∼ 96% CO selectivity at 600°C. Furthermore, we demonstrate that Ni/Co₃O₄ converts 4% of the CO2 in the feed with a 95% CO selectivity at 300°C due to the reducibility of Co₃O₄ promoting the catalytic properties of Ni. |
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