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Titolo:
Simultaneous measurement of self- and transport diffusivities in zeolites
Autore:
Jobic, H; Karger, J; Bee, M;
Indirizzi:
Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France Inst Rech CatalyseVilleurbanne France F-69626 9626 Villeurbanne, France Univ Leipzig, Fak Phys & Geowissensch, D-04103 Leipzig, Germany Univ Leipzig Leipzig Germany D-04103 wissensch, D-04103 Leipzig, Germany Univ Grenoble 1, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France Univ Grenoble 1 St Martin Dheres France F-38402 St Martin Dheres, France
Titolo Testata:
PHYSICAL REVIEW LETTERS
fascicolo: 21, volume: 82, anno: 1999,
pagine: 4260 - 4263
SICI:
0031-9007(19990524)82:21<4260:SMOSAT>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELASTIC NEUTRON-SCATTERING; N-ALKANES; SILICALITE; MOBILITY; DYNAMICS; METHANE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Jobic, H Instceech Catalyse, CNRS, 2 Ave Albert Einstein, F-69626 Villeurbanne, Fran Inst Rech Catalyse 2 Ave Albert Einstein Villeurbanne France F-69626
Citazione:
H. Jobic et al., "Simultaneous measurement of self- and transport diffusivities in zeolites", PHYS REV L, 82(21), 1999, pp. 4260-4263

Abstract

We have used quasielastic neutron scattering to derive the self- and transport diffusion coefficients of hydrogen molecules adsorbed in NaX zeolite. For H-2, incoherent scattering is dominant so that self-diffusion is measured. For D-2, the coherent and incoherent contributions are of the same order of magnitude so that both collective and individual motions can be characterized. At low D-2 concentration, the self- and transport diffusivities have similar values. For higher loadings, the transport diffusivity increasesrapidly and exceeds the self-diffusivity. Only close to the saturation of the zeolite does the transport diffusivity start to decrease. To our knowledge this is the first time that transport and self-diffusion coefficients have been measured simultaneously for an adsorbed molecule. In contrast to numerous examples where discrepancies have been stated, these results are inagreement with each other. [S0031-9007(99)09209-1].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 14:54:23