Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions
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| Názov: | Structure-function relationship for CO2 methanation over ceria supported Rh and Ni catalysts under atmospheric pressure conditions |
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| Autori: | Martin, Natalia Mihaela, 1984, Hemmingsson, Felix, 1992, Schaefer, Andreas, 1981, Ek, Martin, Merte, L. R., Hejral, Uta, 1984, Gustafsson, Johan, Skoglundh, Magnus, 1965, Dippel, Ann Christin, Gutowski, Olof, Bauer, Matthias, Carlsson, Per-Anders, 1972 |
| Zdroj: | Atomär design av katalysatorer Tidsupplösta in situ metoder för design av katalytiska säten för hållbar kemi Synergistisk utveckling av rötngentekniker och tillämpbara tunna oxider för hållbar kemi Catalysis Science and Technology. 9(7):1644-1653 |
| Popis: | 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. |
| Popis súboru: | electronic |
| Prístupová URL adresa: | https://research.chalmers.se/publication/509311 https://research.chalmers.se/publication/509745 https://research.chalmers.se/publication/509745/file/509745_Fulltext.pdf |
| Databáza: | SwePub |
Nájsť tento článok vo Web of Science | Abstrakt: | 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. |
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| ISSN: | 20444753 20444761 |
| DOI: | 10.1039/C8CY02097C |