Synergism of Au and Ru Nanoparticles in Low‐Temperature Photoassisted CO 2 Methanation

Diego Mateo (1) , Déborah de Masi (2) , Josep Albero (1) , Lise-Marie Lacroix (2) , Pier-Francesco Fazzini (2) , Bruno Chaudret (2) , Hermenegildo Garcia (1)

1 UPV - Universitat Politècnica de València = Universitad Politecnica de Valencia = Polytechnic University of Valencia
2 LPCNO - Laboratoire de physique et chimie des nano-objets

Au and Ru nanoparticles have been deposited on Siralox® substrate by impregnation and chemical reduction, respectively (Au-Ru-S). The as-prepared material has demonstrated to be very active for the selective CO2 metanation to CH4 at temperatures below 250 o C. In addition, Au-Ru-S exhibits CH4 production enhancement upon UV-Vis light irradiation starting at temepratures higher than 200 o C, although the contribution of the photoassisted pathway of CH4 production decreases as temperature increases. Thus, a maximum CH4 production of 204 mmol/gRu at 250 o C upon 100 mW/cm 2 irradiation was achieved. Control experiments using Ru-S and Au-S materials revealed that Ru nanoparticles are the CO2 methanation active sites, while Au NPs contribute harvesting light, mainly visible as consequence of the strong Au plasmon band centrered at 529 nm. The visible light absorbed by Au NPs plasmon could act as local heaters of neighbouring Ru NPs, increasing their temperature and enhancing CH4 production.

Domaines: Catalyse

Diego Mateo, Déborah de Masi, Josep Albero, Lise-Marie Lacroix, Pier-Francesco Fazzini, et al.. Synergism of Au and Ru Nanoparticles in Low‐Temperature Photoassisted CO 2 Methanation. Chemistry - A European Journal, 2018, Renewable Energy, 24 (69), pp.18436-18443. ⟨10.1002/chem.201803022⟩. ⟨hal-01984591⟩