A facile TiO2 containing oxygen vacancies and hydroxyl as a Ru-loaded underlay for CO2 hydrogenation to CH4

In the present study, an anatase-TiO2 abundant in oxygen vacancies and hydroxyl was successfully designed and synthesized by introducing NaBH4, and loading Ru on it for application of CO2 hydrogenation to CH4. Compared with the conventional cascade of CO-mediated reactions of traditional Ru/TiO2, the Ru/TiO2 we prepared changes the reaction pathway of CO2 hydrogenation through abundant hydroxyl on the surface of underlying TiO2. The hydroxyl was formed by ion exchange of F- in TiOF2 and H- in NaBH4, and was a key factor in the CO2 methanation activity of the Ru/TiO2 we prepared beyond that of Ru/Deggusa-P25. The CO2 conversion of the Ru/TiO2 we prepared exceeded that of Ru/Deggusa-P25 by 38% and the CH4 formation rate of the Ru/TiO2 we prepared exceeded that of Ru/Deggusa-P25 by 35% at 300 degrees C.

Automated summary

An anatase-TiO2 catalyst with abundant oxygen vacancies and hydroxyl was designed and synthesized through the introduction of NaBH4 and loading Ru on its surface. This catalyst exhibited high activity in the CO2 hydrogenation to CH4 reaction.