Reversibility of hydrogen chemisorption on a ceria-supported rhodium catalyst. Bernal, S., Calving, J., Cifredo, G., Rodríguez-Izquierdo, J., Perrichon, V., & Laachir, A. Journal of Catalysis, 137(1):1-11, 1992. cited By 102
Reversibility of hydrogen chemisorption on a ceria-supported rhodium catalyst [link]Paper  doi  abstract   bibtex   
This work reports on some new aspects of the chemistry of hydrogen-ceria systems. It is shown that, at room temperature, in the presence of highly dispersed rhodium, ceria chemisorbs large amounts of hydrogen. As deduced from magnetic measurements carried out in situ, this spillover process leads to the reduction of ceria to an extent of 21% of the total amount of cerium ions present in the sample, which is roughly equivalent to the complete surface reduction of the oxide. It is found that over a highly hydroxylated sample the reduction of ceria induced by the spillover process is partly reversible even at 295 K. If the sample is pumped off at 773 K, the initial oxidation state of ceria is almost completely recovered. Both the rate and extent of hydrogen chemisorption on ceria were found to be sensitive to the specific pretreatment applied to the catalyst. Over bare ceria, hydrogen chemisorption at 298 K was negligible, temperatures as high as 473 K being necessary to activate the process. In contrast to the rhodium-containing catalyst, over pure ceria the desorption of hydrogen leads to a much larger extent to water formation, thus revealing a deeper irreversible reduction of the oxide. © 1992.
@ARTICLE{Bernal19921,
author={Bernal, S.a  and Calving, J.J.a  and Cifredo, G.A.a  and Rodríguez-Izquierdo, J.M.a  and Perrichon, V.b  and Laachir, A.b },
title={Reversibility of hydrogen chemisorption on a ceria-supported rhodium catalyst},
journal={Journal of Catalysis},
year={1992},
volume={137},
number={1},
pages={1-11},
doi={10.1016/0021-9517(92)90134-4},
note={cited By 102},
url={https://www.scopus.com/inward/record.url?eid=2-s2.0-0344745721&partnerID=40&md5=5b03dd69a7965527633dfe40f38e191e},
affiliation={Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Apartado 40, Puerto Real, 11510 Cádiz, Spain; Institut de Recherches sur la Catalyse (CNRS), 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex, France},
abstract={This work reports on some new aspects of the chemistry of hydrogen-ceria systems. It is shown that, at room temperature, in the presence of highly dispersed rhodium, ceria chemisorbs large amounts of hydrogen. As deduced from magnetic measurements carried out in situ, this spillover process leads to the reduction of ceria to an extent of 21% of the total amount of cerium ions present in the sample, which is roughly equivalent to the complete surface reduction of the oxide. It is found that over a highly hydroxylated sample the reduction of ceria induced by the spillover process is partly reversible even at 295 K. If the sample is pumped off at 773 K, the initial oxidation state of ceria is almost completely recovered. Both the rate and extent of hydrogen chemisorption on ceria were found to be sensitive to the specific pretreatment applied to the catalyst. Over bare ceria, hydrogen chemisorption at 298 K was negligible, temperatures as high as 473 K being necessary to activate the process. In contrast to the rhodium-containing catalyst, over pure ceria the desorption of hydrogen leads to a much larger extent to water formation, thus revealing a deeper irreversible reduction of the oxide. © 1992.},
document_type={Article},
source={Scopus},
}
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