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Titolo:
Formation of formate in the deep oxidation of methanol on Pt(III) under UHV condition studied by IRAS
Autore:
Endo, M; Matsumoto, T; Kubota, J; Domen, K; Hirose, C;
Indirizzi:
Tokyo Inst Technol, Resources Utilizat Res 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: 20, volume: 104, anno: 2000,
pagine: 4916 - 4922
SICI:
1520-6106(20000525)104:20<4916:FOFITD>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
REFLECTION-ABSORPTION SPECTROSCOPY; IN-SITU OBSERVATION; PT(111) SURFACE; EXCHANGE REACTION; ATOMIC OXYGEN; PLATINUM 111; FORMIC-ACID; DECOMPOSITION; O-2; TPD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Hirose, C Tokyo Inst Technol, Resources Utilizat Res Lab, Midori Ku, 4259 Nagatsuta,Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
M. Endo et al., "Formation of formate in the deep oxidation of methanol on Pt(III) under UHV condition studied by IRAS", J PHYS CH B, 104(20), 2000, pp. 4916-4922

Abstract

The reaction of methanol with oxygen on Pt(111) under ultrahigh vacuum condition has been investigated by infrared reflection absorption spectroscopy(IRAS). Molecular and atomic states of adsorbed oxygen existed on the Pt(111) surface, and the adsorption of oxygen at 100 K gave molecularly adsorbed oxygen that dissociated to adatoms at similar to 160 K. Formate species, which gave the symmetric C-O stretching band at 1327 cm(-1), was observed when methanol-adsorbed Pt(111) surface which was precovered by molecular oxygen, was heated to 160 K. The IRAS band of formate was verified by comparison with the band of the formate derived from formic acid on the Pt(111) surface and by the isotope shift of the band observed by using deuterated methanol. The amount of produced formate was proportional to the amount of the molecularly adsorbed oxygen. The formate band disappeared at 270 K, at which temperature desorption of CO2 and H-2 was observed on temperature-programmed desorption spectra. Molecular oxygen on the Pt(111) surface dissociatedat 300 K and the produced adatoms did not oxidize methanol, but the methanol was decomposed to CO and H-2. Molecularly adsorbed oxygen is thus considered to be responsible for the oxidation of methanol to formate.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:37:29