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Synergism of Au and Ru Nanoparticles in Low‐Temperature Photoassisted CO 2 Methanation
Author(s) -
Mateo Diego,
De Masi Deborah,
Albero Josep,
Lacroix LiseMarie,
Fazzini PierFrancesco,
Chaudret Bruno,
García Hermenegildo
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201803022
Subject(s) - methanation , nanoparticle , visible spectrum , irradiation , substrate (aquarium) , plasmon , chemistry , catalysis , photochemistry , materials science , chemical engineering , nuclear chemistry , nanotechnology , optoelectronics , organic chemistry , physics , oceanography , geology , nuclear physics , engineering
Au and Ru nanoparticles (NPs) have been deposited on Siralox® substrate by impregnation and chemical reduction, respectively (Au‐Ru‐S). The as‐prepared material is very active in the selective CO 2 methanation to CH 4 at temperatures below 250 °C. In addition, Au‐Ru‐S shows enhanced CH 4 production upon irradiation with UV/Vis light starting at temperatures higher than 200 °C, although the contribution of the photoassisted pathway of CH 4 production decreases as the temperature increases. Thus, a maximum CH 4 production of 204 mmol g Ru −1 at 250 °C upon 100 mW cm −2 irradiation was achieved. Control experiments, in which Ru‐S and Au‐S materials were used, revealed that Ru NPs are the CO 2 methanation active sites, while Au NPs contribute by harvesting light, mainly visible as a consequence of the strong Au plasmon band centered at 529 nm. The visible light absorbed by the plasmonic band of Au NPs could make them act ass local heaters of the neighboring Ru NPs, increasing their temperature and enhancing CH 4 production.