Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions
Artikel i vetenskaplig tidskrift, 2019

In situ structural and chemical state characterization of Rh/CeO 2 and Ni/CeO 2 catalysts during atmospheric pressure CO 2 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 CO 2 methanation and in particular Ce 3+ species seem to facilitate activation of CO 2 molecules. The activated CO 2 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/CeO 2 ), 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/CeO 2 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/CeO 2 is proposed to be due to the stronger metal-support interaction.


Natalia Mihaela Martin

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Kompetenscentrum katalys

Felix Hemmingsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Kompetenscentrum katalys

Andreas Schaefer

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Kompetenscentrum katalys

Martin Ek

Lunds universitet

L. R. Merte

Malmö universitet

Uta Hejral

Lunds universitet

Johan Gustafsson

Lunds universitet

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Ann Christin Dippel

Deutsches Elektronen-Synchrotron (DESY)

Olof Gutowski

Deutsches Elektronen-Synchrotron (DESY)

Matthias Bauer

Universität Paderborn

Per-Anders Carlsson

Kompetenscentrum katalys

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 9 7 1644-1653

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