Suppression of coke formation during reverse water-gas shift reaction for CO2 conversion using highly active Ni/Al2O3-CeO2 catalyst material

Abstract

The catalytic reduction of CO2 via reverse water-gas shift (RWGS) reaction is the most efficient way of CO2 valorization. In this work, the Ni/Al2O3-CeO2 catalyst was prepared by microwave-assisted solution combustion synthesis. XRD, TEM, N2 physisorption, and H2-TPR results show desired phase formation, small crystalline size, more developed porous structure with high surface area, and high levels of CO2 conversion. The catalyst shows excellent stability at 800°C indicating suppression of coke formation due to the presence of well-dispersed CeAlO3 which prevents carbon deposition on nickel active sites and provides the oxidative environment. The findings of this work will illustrate the potential application of Ni-based catalysts for the catalytic reduction of CO2 to CO with excellent activity and selectivity.