Influence of preparation method on performance of Ni-CeO2 catalysts for reverse water-gas shift reaction

This study investigated 1 wt.% Ni-CeO2 catalysts that were prepared using co-precipitation,deposition-precipitation,and impregnation methods for the reverse water-gas shift (RWGS) reaction.Characterizations of the catalyst samples were conducted by Brumauer-Emmett-Teller (BET),atomic absorption spectrophotometer (AAS),X-ray diffraction (XRD),transmission electron microscopy (TEM),high-resolution transmission electron microscopy (HR-TEM) and temperature programmed reduction (TPR).The results showed that the Ni-CeO2 catalyst prepared using the co-precipitation method exhibited the best catalytic performance.In the Ni-CeO2 catalyst prepared using co-precipitation method,a combination of highly dispersed NiO and abundant oxygen vacancies was assumed to play a crucial role in determining the catalytic activity and selectivity of the RWGS reaction.