Catalytic Activity for CO2 Hydrogenation is Linearly Dependent on Generated Oxygen Vacancies over CeO2‐Supported Pd Catalysts

Abstract CO 2 hydrogenation to methanol is a promising way to achieve the utilization of CO 2 to high‐value chemicals. Promoters are frequently applied to regulate the chemical and physical properties of catalysts, but their critical role in selective CO 2 hydrogenation toward methanol over Pd/CeO 2 is still far from clear. In this work, a series of promoters including La, Zr, Cr, Ca, Co, Cd, Zn, Bi, and K are selected to co‐impregnate with Pd precursor on ceria nanorods to reveal their impact on CO 2 hydrogenation performance. It turns out that the catalytic activity over Pd/CeO 2 catalyst is linearly dependent of the amount of created oxygen vacancies which determines by the nature of promoter. Especially, the introduction of Zr could incorporate into ceria lattice for the facile formation of oxygen vacancies, thus notably enhancing the catalytic activity with slightly higher methanol selectivity.