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Titolo:
Quasi-elastic neutron scattering study of the mobility of methane in microporous silica
Autore:
Benes, NE; Jobic, H; Verweij, H;
Indirizzi:
Univ Twente, Fac Chem Technol, Lab Inorgan Mat Sci, NL-7500 AE Enschede, Netherlands Univ Twente Enschede Netherlands NL-7500 AE 500 AE Enschede, Netherlands Univ Twente, MESA Res Inst, NL-7500 AE Enschede, Netherlands Univ Twente Enschede Netherlands NL-7500 AE 500 AE Enschede, Netherlands Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France Inst Rech CatalyseVilleurbanne France F-69626 9626 Villeurbanne, France
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 2, volume: 43, anno: 2001,
pagine: 147 - 152
SICI:
1387-1811(200104)43:2<147:QNSSOT>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD GRADIENT TECHNIQUE; MEMBRANE REACTORS; ZEOLITES; BENZENE; ZSM-5;
Keywords:
quasi-elastic neutron scattering; microporous silica; methane; self-diffusion; small angle X-ray scattering;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Benes, NE Univ Twente, Fac Chem Technol, Lab Inorgan Mat Sci, CT-1745,POB 217, NL-7500 AE Enschede, Netherlands Univ Twente CT-1745,POB 217 EnschedeNetherlands NL-7500 AE nds
Citazione:
N.E. Benes et al., "Quasi-elastic neutron scattering study of the mobility of methane in microporous silica", MICROP M M, 43(2), 2001, pp. 147-152

Abstract

The dynamics of translation and rotation of methane in microporous bulk silica have been studied with quasi-elastic neutron scattering. At T = 200 K the self-diffusion coefficient of translation is D-S = 1.1x10(-8) m(2) s(-1) with an estimated activation energy of 4 kJmol(-1). Any variation of D-S with occupancy is within the experimental error of 50%. The isotropic rotational diffusion constant D-R is of the order of 10(11) s(-1), with an experimental error of a factor of 2. The pore-size distribution has been studiedwith small angle X-ray scattering. A broad pore-size distribution is observed, with pores smaller than 10 Angstrom. The largest fraction of pores is observed at the lower experimental limit, corresponding to a pore size of 2Angstrom. (C) 2001 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 11/07/20 alle ore 19:55:08