Influence of oxygen vacancies of CeO2 on reverse water gas shift reaction

The lattice oxygen determines the methanol selectivity in CO2 hydrogenation over ZnZrOx catalysts

“…Qu and coworker believed that a moderate concentration of vacancies was necessary for CO 2 conversion, where the surface lattice oxygen was responsible for the activation of H 2 , while the vacancy contributed to the activation of CO 2 . 32 In our work, a linear relationship between methanol formation rate and lattice oxygen density was established. We inferred that CO 2 was adsorbed and activated on the oxygen vacancies neighboring Zr species, while the rate limiting step H 2 activation occurred in the Zn–O sites.…”

“…31 Qu and coworkers reported that lattice oxygens are responsible for the activation of H 2 , while the vacancies contribute to the adsorption and activation of CO 2 . The catalyst with moderate ratio of lattice oxygen to vacancy oxygen showed good catalytic performance in CO 2 hydrogenation to CO. 32 It was also reported that the methanol formation rate was linearly dependent on the number of oxygen vacancies. 33 The study of the role of lattice oxygen in CO 2 hydrogenation to methanol over the perovskite La x Sr 1− x CuO indicated that the catalytic performance was consistent with the mobility of oxygen, and the lattice oxygen played a critical role in promoting methanol formation.…”

Highly stable Fe/CeO2 catalyst for the reverse water gas shift reaction in the presence of H2S

“…The role of H 2 S was discussed from the viewpoint of reaction mechanism. The reaction pathway envisioned is that CO 2 is activated on the surface of the CeO 2 support 27 and reduced to CO by reacting with hydrogen activated by FeS x . The coexisting H 2 S is also expected to regenerate lattice S 2− to produce activated H atoms, and this generated hydrogen species further activates CO 2 .…”

Defect-Driven Efficient Selective CO2 Hydrogenation with Mo-Based Clusters

“…CeO 2 with surface regulation also exhibited a high activity in the RWGS reaction. Dedicated oxygen defects on the catalysts realized a balance between CO 2 dissociation and surface hydrogenation, delivering the best activity . Native point defects in vanadium carbide strengthened the electronic interactions between the reactant and the catalyst, facilitating the RWGS reaction .…”