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Titolo:
In situ observation of the exchange reaction of formate with molecular formic acid on Ni(110)
Autore:
Yamakata, A; Kubota, J; Kondo, JN; Hirose, C; Domen, K; Wakabayashi, F; Tamaru, K;
Indirizzi:
Tokyowanst Technol, Resources Utilizat Res Lab, Midori Ku, Yokohama, Kanaga Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 i Ku, Yokohama, Kanaga Sci Univ Tokyo, Dept Mat Sci & Technol, Yamaguchi 7560834, Japan Sci Univ Tokyo Yamaguchi Japan 7560834 Technol, Yamaguchi 7560834, Japan Natl Sci Museum, Dept Sci & Engn, Shinjuku Ku, Tokyo 1690073, Japan Natl Sci Museum Tokyo Japan 1690073 n, Shinjuku Ku, Tokyo 1690073, Japan
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-3, volume: 141, anno: 1999,
pagine: 73 - 82
SICI:
1381-1169(19990506)141:1-3<73:ISOOTE>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADSORPTION-DESORPTION-KINETICS; CARBON-MONOXIDE; POTENTIAL-ENERGY; LOCAL REDUCTION; DECOMPOSITION; SURFACES; CO; NI(100); DYNAMICS; COPPER;
Keywords:
formate; exchange reaction; Ni(110); adsorption-assisted desorption;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Wakabayashi, F Natl690073,seum, Dept Sci & Engn, Shinjuku Ku, 3-23-1 Hyakunin Cho, Tokyo 1 Natl Sci Museum 3-23-1 Hyakunin Cho Tokyo Japan 1690073 1
Citazione:
A. Yamakata et al., "In situ observation of the exchange reaction of formate with molecular formic acid on Ni(110)", J MOL CAT A, 141(1-3), 1999, pp. 73-82

Abstract

The exchange reaction of adsorbed formate on Ni(110) with formic acid in gas phase was studied by the time-resolved infrared reflection absorption spectroscopy (TR-IRAS). It was found that the pre-adsorbed deuterated formate(DCOO(a)) was changed to HCOO(a) in the presence of HCOOD(g) at the temperature region from 240 to 300 K. In such a temperature region, the formate was stable on the surface in vacuum and the decomposition of formate was notobserved. It was suggested that the pre-adsorbed DCOO(a) was desorbed as DCOOD accepting deuterium atom from HCOOD. The activation energy of the exchange reaction was estimated to be 23 +/- 2 kJ mol(-1). The reaction order with respect to formic acid pressure was 0.3 +/- 0.1, while that as to the coverage of DCOO(a), was unity. Taking into account all the experimental results, the exchange of pre-adsorbed formate with post-exposed formic acid issuggested to proceed via forming a hydrogen-bonded intermediate complex onthe formate's site, because all the sites were already occupied by formate. The small activation energy of the exchange reaction is discussed on the basis of 'adsorption-assisted desorption'. We propose that when desorption and adsorption are coupled, the activation energy of the exchange reaction should be described as a sum of the potential energy profiles of a desorbing and an adsorbing molecule. (C) 1999 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:16:14