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Titolo:
Catalytic decomposition of formic acid on oxide catalysts - III. IOM modelapproach to bimolecular mechanism
Autore:
Borowiak, LA; Jamroz, MH; Larsson, R;
Indirizzi:
Univ Lund, Ctr Chem, Grp Catalysis Res Chem Engn 2, S-22100 Lund, Sweden Univ Lund Lund Sweden S-22100 ysis Res Chem Engn 2, S-22100 Lund, Sweden Ind Chem Res Inst, PL-01793 Warsaw, Poland Ind Chem Res Inst Warsaw Poland PL-01793 s Inst, PL-01793 Warsaw, Poland
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 152, anno: 2000,
pagine: 121 - 132
SICI:
1381-1169(20000301)152:1-2<121:CDOFAO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIO2(110) SURFACE; REACTION PATHS; SWITCHOVER;
Keywords:
catalytic decomposition; formic acid; oxide catalysts;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Larsson, R Univ Lund, Ctr Chem, Grp Catalysis Res Chem Engn 2, POB 124, S-22100 Lund,Sweden Univ Lund POB 124 Lund Sweden S-22100 124, S-22100 Lund,Sweden
Citazione:
L.A. Borowiak et al., "Catalytic decomposition of formic acid on oxide catalysts - III. IOM modelapproach to bimolecular mechanism", J MOL CAT A, 152(1-2), 2000, pp. 121-132

Abstract

In our previous paper [M.A. Borowiak, M.H. Jamroz, R. Larsson, J. Mol. Catal. A: Chem., 139 (1999) 97], an impulse-oscillation model (IOM) was used for a time description of catalytic acts in the reactions of catalytic decomposition of formic acid on oxide catalysts for unimolecular mechanism. In this paper: the bimolecular mechanism were modelled for the same reactions. The results of IOM calculation show the increase of the Selectivity of choice of the dehydrogenation path, in comparison to the unimolecular mechanism. The highest increase is for monodentate or bridged forms of adsorbed formats ions (the selectivity 60% in comparison to 42% for the unimolecular mechanism). The OCO bending mode in formate and the O-H surface stretching modes are not so important in the bimolecular mechanism as in unimolecular one. The conclusion can be explained from the point of view of the postulated [H. Onishi, T. Aruga, Y. Iwasawa, J. Am. Chem. Sec. 115 (1993) 10460; H. Onishi, T. Aruga, Y. Iwasawa, J. Catal. 146 (1994) 557; H. Onishi, Y. Iwasawa, Chem. Phys. Lett, 226(1994) 111; Y. Iwasawa, Stud. Surf. Sci. Catal. 101 (1996)21] mechanism which does not need strong deformation of OCO bond system and used as a source of acid proton from formic acid and not from surface hydroxyl group on catalyst. The best ranges of wavenumbers for the considered in IOM modes for the dehydrogenation reaction are proposed. (C) 2000 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 28/09/20 alle ore 21:44:32