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Titolo:
Infrared spectroscopic studies on cations in zeolite pores using CH4 as a probe molecule
Autore:
Yamazaki, T; Hasegawa, K; Honma, K; Ozawa, S;
Indirizzi:
Ishinomaki Senshu Univ, Sch Sci & Engn, Dept Basic Sci, Ishinomaki 9868580, Japan Ishinomaki Senshu Univ Ishinomaki Japan 9868580 shinomaki 9868580, Japan Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Aoba Ku, Sendai, Miyagi 9808579, Japan Tohoku Univ Sendai Miyagi Japan 9808579 Ku, Sendai, Miyagi 9808579, Japan Akita Univ, Fac Engn & Resource Sci, Akita 0108502, Japan Akita Univ Akita Japan 0108502 Engn & Resource Sci, Akita 0108502, Japan
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 13, volume: 3, anno: 2001,
pagine: 2686 - 2691
SICI:
1463-9076(2001)3:13<2686:ISSOCI>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXCHANGED ZSM-5 ZEOLITES; POTENTIAL ENERGIES; METHANE ADSORPTION; H-MORDENITE; NAA ZEOLITE; A-ZEOLITES; IR-SPECTRA; CO; HYDROGEN; SITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Yamazaki, T Ishinomaki Senshu Univ, Sch Sci & Engn, Dept Basic Sci, 1 Shinnmito, Ishinomaki 9868580, Japan Ishinomaki Senshu Univ 1 Shinnmito Ishinomaki Japan 9868580 n
Citazione:
T. Yamazaki et al., "Infrared spectroscopic studies on cations in zeolite pores using CH4 as a probe molecule", PHYS CHEM P, 3(13), 2001, pp. 2686-2691

Abstract

To clarify the nature of cation sites, such as the strength of the electric field exerted by them, their location, etc., in zeolite pores, adsorptionof methane on a series of ion (Li, Na, K and Rb) exchanged zeolites (FAU, FER and MOR) with different Si/Al ratios was discussed based on IR spectroscopy and adsorption thermodynamics. The interaction energy of methane with the zeolites was strongly correlated with the micropore size of the main channel rather than the cation content in the zeolites. On the contrary, the strength of the electric field in the vicinity of Na sites increased with the increase in the Si/Al ratio of the zeolite in spite of the decrease in the amount of cations. All of the cations incorporated in the zeolites studied were not always available for methane adsorption since cations in the zeolites are distributed into deep (methane inaccessible) sites and surface (methane accessible) sites, and the amount of inaccessible sites often increased with the decrease in the size of the cation.

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Documento generato il 13/07/20 alle ore 18:04:18