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Titolo:
Adsorption of water vapor on X and Y zeolites exchanged with barium
Autore:
Moise, JC; Bellat, JP; Methivier, A;
Indirizzi:
Univ Bourgogne, CNRS UMR 5613, Lab Rech React Solides, UFR ST, F-21078 Dijon, France Univ Bourgogne Dijon France F-21078 lides, UFR ST, F-21078 Dijon, France Inst Francais Petr, F-92852 Rueil Malmaison, France Inst Francais Petr Rueil Malmaison France F-92852 ueil Malmaison, France
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1, volume: 43, anno: 2001,
pagine: 91 - 101
SICI:
1387-1811(200103)43:1<91:AOWVOX>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
P-XYLENE; DIFFRACTION; FAUJASITES;
Keywords:
adsorption; BaX; BaY; water; stability;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Bellat, JP Univ Bourgogne, CNRS UMR 5613, Lab Rech React Solides, UFR ST, 9 Allee A Savary,BP 47870, F-21078 Dijon, France Univ Bourgogne 9 Allee A Savary,BP 47870 Dijon France F-21078
Citazione:
J.C. Moise et al., "Adsorption of water vapor on X and Y zeolites exchanged with barium", MICROP M M, 43(1), 2001, pp. 91-101

Abstract

The adsorption of water vapor on BaY and BaX zeolites is studied by thermogravimetry and calorimetry under isothermal or isobaric conditions. The faujasite zeolite exhibits a stronger adsorption affinity for water molecules with barium than with sodium or potassium as exchangeable cations. The adsorption-desorption isotherm at 150 degreesC shows a hysteresis loop attributed to the migration of compensating cations during their interaction with water molecules. Calorimetric measurements and the Dubinin Radushkevich's model both show that the adsorption of water occurs via a three-step mechanism: adsorption on compensating cations, formation of a monolayer on the walls and multilayer adsorption in the cavities. Water probes the complete microporosity of the zeolite. After several isobaric adsorption-desorption cycles, the structure of BaX undergoes severe damages (complete loss of the microporosity and amorphization of the solid) whereas that of BaY remains intact. (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 07/04/20 alle ore 22:49:25