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Titolo:
Properties of chemisorbed hydrogen species on Ag-A zeolite partially reduced with hydrogen as studied by H-1 MAS NMR
Autore:
Baba, T; Tohjo, Y; Takahashi, T; Sawada, H; Ono, Y;
Indirizzi:
Japan Energy Analyt Res Ctr Co Ltd, Toda, Saitama 3350026, Japan Japan Energy Analyt Res Ctr Co Ltd Toda Saitama Japan 3350026 0026, Japan Tokyo Inst Technol, Dept Chem Engn, Meguro Ku, Tokyo 1528552, Japan Tokyo Inst Technol Tokyo Japan 1528552 , Meguro Ku, Tokyo 1528552, Japan
Titolo Testata:
CATALYSIS TODAY
fascicolo: 1, volume: 66, anno: 2001,
pagine: 81 - 89
SICI:
0920-5861(20010315)66:1<81:POCHSO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHARGED SILVER CLUSTERS; SPECTROSCOPY;
Keywords:
hydrogen; Ag-A; H-1 MAS NMR; acidic proton; sliver hydride;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Baba, T Tokyo Inst Technol, Dept Chem Engn, Meguro Ku, Tokyo 1528552, Japan Tokyo Inst Technol Tokyo Japan 1528552 Ku, Tokyo 1528552, Japan
Citazione:
T. Baba et al., "Properties of chemisorbed hydrogen species on Ag-A zeolite partially reduced with hydrogen as studied by H-1 MAS NMR", CATAL TODAY, 66(1), 2001, pp. 81-89

Abstract

Heterolytic dissociation of H-2 proceeded to form acidic protons and silver hydride species, Ag-3-H upon exposing Ag-A to hydrogen. The effects of the degree of Ag+ ion exchange and the temperature of hydrogen exposure on the formation of hydrogen chemisorbed species were examined with H-1 MAS NMR. Furthermore. the thermal stability of silver hydride species and the temperature dependence of the line shape of the peak due to acidic protons were studied with raising the temperature stepwise from 298 to 513 K. The thermal stability of Ag-3-H and the mobility of acidic protons decreased with increasing the Ag+ content in zeolite. Ag-3-H reacted with acidic protons to form H-2 and Ag-3(+) at 353 K. This result was in conformity with the mechanism of hydrogen adsorption proposed in our previous work. (C) 2001 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 07:00:39