CO2 methanation by Ru-doped ceria: the role of the oxidation state of the surface

Show simple item record Upham, Chester Derk, Alan R. Sharma, Sudhanshu Metiu, Horia McFarland, Eric W. 2015-01-21T11:28:30Z 2015-01-21T11:28:30Z 2015-01
dc.identifier.citation Upham, Chester; Derk, Alan R.; Sharma, Sudanshu; Metiu, Horia and McFarland, Eric W., “CO2 methanation by Ru-doped ceria: the role of the oxidation state of the surface”, Catalysis Science & Technology, DOI: 10.1039/C4CY01106F, vol. 5, no. 3, pp. 1783-1791, Jan. 2015.
dc.identifier.issn 2044-4753
dc.description.abstract Ru0.05Ce0.95Ox is an active catalyst for methanation of CO2 with H2. Under reaction conditions one expects that oxygen vacancies are present on the oxide catalyst surface and that their steady-state concentration depends upon the relative ratio of the oxidant (CO2) to the reductant (H2). We show that the activity of the catalyst is sensitive to the degree of surface reduction: a surface that is too reduced or too oxidized loses activity. Exposing the oxidized surface to CO2 and then to H2 produces no methane, while on a reduced surface methane is produced by exposure to CO2 followed by H2. If the reaction is carried out at the steady state, purged, and then exposed to only hydrogen, methane is produced. Methane is formed through the reaction of hydrogen with surface species, whose infrared spectrum is associated with a variety of surface carbonates, and not through CO or a formate intermediate. en_US
dc.description.statementofresponsibility by D. Chester Upham, Alan R. Derk, Sudanshu Sharma, Horia Metiu and Eric W. McFarland
dc.format.extent vol. 5, no. 3, pp. 1783-1791
dc.language.iso en_US en_US
dc.publisher Royal Society of Chemistry en_US
dc.subject Catalytic chemistry en_US
dc.subject Ceria en_US
dc.subject Doped ceria en_US
dc.subject Global effects en_US
dc.subject IR spectroscopy en_US
dc.subject Temperature programmed reactions en_US
dc.title CO2 methanation by Ru-doped ceria: the role of the oxidation state of the surface en_US
dc.type Article en_US
dc.relation.journal Catalysis Science & Technology

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