CO2 hydrogenation with shape-controlled Pd nanoparticles embedded in mesoporous silica: Elucidating stability and selectivity issues

J. Martins (1) , Nelly Batail (1) , Susana Lopes-Silva (1) , Souad Rafik-Clément (1) , A. Karelovic (2) , D.P. Debecker (2) , Alexandra Chaumonnot (1) , Denis Uzio (1)

1 IFPEN - IFP Energies nouvelles
2 IMCN - Institut de la matière condensée et des nanosciences / Institute of Condensed Matter and Nanosciences

Shape-controlled Pd nanocubes and nanopolyedra particles wereembedded inmesoporous silica shells and their catalytic properties for the CO2 hydrogenation were compared to a reference Pd/SiO2 catalyst prepared by wetness impregnation.Whereas the Pd impregnated silica exhibits a strong deactivation, the activity of both embedded solids is remarkably stable. This difference is due to a significant Pd particles sintering in the reference catalyst while no increase of particle size is observed for the core@shell solids. CH4 selectivity is shown to be correlated to the mean coordination number of surface atoms which controls the adsorption strength of CO as intermediate species.

Mots clés: CO2 methanation; Embedded palladium nanoparticles; Nanoparticles morphology; Mesoporous silica; Core–shell catalysts

Domaines: Chimie; Catalyse

J. Martins, Nelly Batail, Susana Lopes-Silva, Souad Rafik-Clément, A. Karelovic, et al.. CO2 hydrogenation with shape-controlled Pd nanoparticles embedded in mesoporous silica: Elucidating stability and selectivity issues. Catalysis Communications, 2015, 58, pp.11-15. ⟨10.1016/j.catcom.2014.08.027⟩. ⟨hal-01100323⟩