In the present study, we have leveraged the aerosol-assisted sol-gel process to prepare hierarchical mesoporous Ti-promoted silica supports for Ru-based methanation catalysts. Ti is chosen as the promoter considering that the combination between Ru and Ti is one of the most promising catalyst formulations for CO2 methanation . In addition, this method enables us to unravel the effects of Ti promoter on the catalytic performance of silica supported Ru catalysts in CO2 methanation.