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Titolo:
Diffusion of benzene in NaX and NaY zeolites studied by quasi-elastic neutron scattering
Autore:
Jobic, H; Fitch, AN; Combet, J;
Indirizzi:
Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France Inst Rech CatalyseVilleurbanne France F-69626 9626 Villeurbanne, France Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France Inst Max Von Laue Paul Langevin Grenoble France F-38042 Grenoble, France European Synchrotron Radiat Facil, F-38043 Grenoble, France European Synchrotron Radiat Facil Grenoble France F-38043 enoble, France
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 35, volume: 104, anno: 2000,
pagine: 8491 - 8497
SICI:
1520-6106(20000907)104:35<8491:DOBINA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SODIUM-Y ZEOLITE; MOLECULAR-DYNAMICS; AROMATIC-MOLECULES; SORPTION KINETICS; SELF-DIFFUSION; SIMULATION; MOBILITY; DIFFRACTION; TRANSPORT; DIFFUSIVITIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Jobic, H Inst Rech Catalyse, CNRS, 2 Ave Albert Einstein, F-69626 Villeurbanne, France Inst Rech Catalyse 2 Ave Albert Einstein Villeurbanne France F-69626
Citazione:
H. Jobic et al., "Diffusion of benzene in NaX and NaY zeolites studied by quasi-elastic neutron scattering", J PHYS CH B, 104(35), 2000, pp. 8491-8497

Abstract

Quasi-elastic neutron scattering (QENS) has been used to study the diffusion of benzene in NaX and NaY zeolites. The self-diffusion coefficient is found to decrease with increasing loading in both zeolites. In NaX, the diffusivities obtained from QENS are in reasonable agreement with those obtainedby pulsed-field gradient NMR or frequency-response methods, but a large discrepancy is observed with results from the tracer zero-length column technique. In NaY, where the experimental results are scarce, the diffusion coefficients derived from QENS compare well with those from different simulation techniques. At low benzene concentrations, extrapolation of the QENS values to 300 K yields diffusivities that are almost 2 orders of magnitude lower in NaY than in NaX. This reflects the strong influence of the cation distribution at this temperature. The activation energy for diffusion in NaY, 33.7 kJ/mol, is about twice that in NaX, 17 kJ/mol, at low loading.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:34:38