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Titolo:
Infrared study of CO adsorption and oxidation over Au/Al2O3 catalyst at 150 K
Autore:
Jia, JF; Kondo, JN; Domen, K; Tamaru, K;
Indirizzi:
Tokyo Inst Technol, Chem Resources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 anagawa 2268503, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 15, volume: 105, anno: 2001,
pagine: 3017 - 3022
SICI:
1520-6106(20010419)105:15<3017:ISOCAA>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-MONOXIDE OXIDATION; LOW-TEMPERATURE OXIDATION; SUPPORTED AU CATALYSTS; GAS SHIFT REACTION; GOLD CATALYSTS; TITANIUM; OXYGEN; FTIR; TIO2; HYDROGENATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Domen, K Tokyo Inst Technol, Chem Resources Lab, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
J.F. Jia et al., "Infrared study of CO adsorption and oxidation over Au/Al2O3 catalyst at 150 K", J PHYS CH B, 105(15), 2001, pp. 3017-3022

Abstract

CO adsorption and oxidation over Au/Al2O3 were studied by infrared (IR) spectroscopy at 150 K. Two types of CO adsorption were found on the support, Al2O3, With the existence of gaseous CO (266 Pa). An additional band of adsorbed CO at 2110 cm(-1) was found on Au/Al2O3 at 150 K in the presence of gaseous CO and was assigned to CO adsorbed on ultrafine gold particles dispersed on Al2O3 support After evacuation at the same temperature, the band ofCO adsorbed on the, ultrafine gold particles decreased in intensity and shifted to 2118 cm(-1), whereas the CO adsorbed on Al2O3 disappeared. The band at 2118 cm(-1) was assigned to CO irreversibly adsorbed on the ultrafine gold particles at 150 K. CO oxidation by O-2 took place on Au/Al2O3 in the presence of CO and O-2 gas mixture even at 150 K, whereas CO irreversibility adsorbed on Au/Al2O3 and could not be oxidized by the exposure to O-2 at the same temperature. Therefore, the reversibly adsorbed CO on the ultrafine gold particles was found to be the active CO species for CO oxidation at 150 K. By spectral analysis, the reversibly adsorbed CO was found to show aband at 2108 cm-l. The ultrafine gold particles were oxidized by O-2 treatment at 573 K, becoming inert for CO oxidation at 150 K, but were easily rereduced at 573 K by evacuation treatment. The recovered Au/Al2O3 also catalyzed CO oxidation at 150 K.

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Documento generato il 24/09/20 alle ore 00:51:50