Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions

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Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions

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Publication Article, peer reviewed scientific
Title Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions
Author Martin, Natalia M. ; Hemmingsson, Felix ; Schaefer, Andreas ; Ek, Martin ; Merte, Lindsay R. ; Hejral, Uta ; Gustafson, Johan ; Skoglundh, Magnus ; Dippel, Ann-Christin ; Gutowski, Olof ; Bauer, Matthias ; Carlsson, Per-Anders
Date 2019
English abstract
In situ structural and chemical state characterization of Rh/CeO2 and Ni/CeO2 catalysts during atmospheric pressure CO2 methanation has been performed by a combined array of time-resolved analytical techniques including ambient-pressure X-ray photoelectron spectroscopy, high-energy X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. The ceria phase is partially reduced during the CO2 methanation and in particular Ce3+ species seem to facilitate activation of CO2 molecules. The activated CO2 molecules then react with atomic hydrogen provided from H-2 dissociation on Rh and Ni sites to form formate species. For the most active catalyst (Rh/CeO2), transmission electron microscopy measurements show that the Rh nanoparticles are small (average 4 nm, but with a long tail towards smaller particles) due to a strong interaction between Rh particles and the ceria phase. In contrast, larger nanoparticles were observed for the Ni/CeO2 catalyst (average 6 nm, with no crystallites below 5 nm found), suggesting a weaker interaction with the ceria phase. The higher selectivity towards methane of Rh/CeO2 is proposed to be due to the stronger metal-support interaction.
DOI https://doi.org/10.1039/c8cy02097c (link to publisher's fulltext.)
Link https://doi.org/10.1039/c8cy02097c .Icon
Publisher Royal Society Of Chemistry
Host/Issue Catalysis Science & Technology;7
Volume 9
ISSN 2044-4753
Language eng (iso)
Subject Chemistry, Physical
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/29516 Permalink to this page
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