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Titolo:
Diffusion of isobutane in ZSM-5 zeolite: A comparison of quasi-elastic neutron scattering and supported membrane results
Autore:
Millot, B; Methivier, A; Jobic, H; Moueddeb, H; Bee, M;
Indirizzi:
Inst Francais Petr, F-92852 Rueil Malmaison, France Inst Francais Petr Rueil Malmaison France F-92852 ueil Malmaison, France Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France Inst Rech CatalyseVilleurbanne France F-69626 9626 Villeurbanne, France 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:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 7, volume: 103, anno: 1999,
pagine: 1096 - 1101
SICI:
1520-6106(19990218)103:7<1096:DOIIZZ>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
FREQUENCY-RESPONSE METHOD; MAXWELL-STEFAN EQUATIONS; SILICALITE-1 MEMBRANE; MOLECULAR-DYNAMICS; N-ALKANES; HYDROCARBONS; SEPARATION; BUTANE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Methivier, A Inst Francais Petr, 1 & 4 Av Bois Preau, F-92852 Rueil Malmaison, France Inst Francais Petr 1 & 4 Av Bois Preau Rueil Malmaison France F-92852
Citazione:
B. Millot et al., "Diffusion of isobutane in ZSM-5 zeolite: A comparison of quasi-elastic neutron scattering and supported membrane results", J PHYS CH B, 103(7), 1999, pp. 1096-1101

Abstract

Isobutane diffusivities in ZSM-5 zeolite have been measured by quasi-elastic neutron scattering (QENS) and supported membrane techniques. This is thefirst diffusivity measurement of a branched alkane inside a zeolite of MFItype using a microscopic method. The self-diffusion coefficient derived from QENS is 3 x 10(-12) m(2)/s at 500 K. The diffusivity obtained with the supported membrane is 1 order of magnitude larger. In view of the large differences usually reported in the literature between microscopic and macroscopic techniques, the comparison between QENS and supported membrane data is quite satisfactory. The activation energy for diffusion determined from QENS is 17 kJ/mol. Because of the variation of loading due to temperature changes, an apparent activation energy is obtained with the supported membrane;it is 34 kJ/mol. In this zeolite, the diffusion of branched hydrocarbons is much slower than that of linear alkanes; the diffusion coefficient of isobutane is found to be 3 orders of magnitude lower than that of n-butane by QENS.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 18:55:11