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Titolo:
High silica zeolites with three-dimensional systems of large pore channels
Autore:
Camblor, MA; Barrett, PA; Diaz-Cabanas, MJ; Villaescusa, LA; Puche, M; Boix, T; Perez, E; Koller, H;
Indirizzi:
CSIC, UPV, Inst Tecnol Quim, Valencia 46022, Spain CSIC Valencia Spain 46022 , UPV, Inst Tecnol Quim, Valencia 46022, Spain Univ Munster, Inst Phys Chem, D-48149 Munster, Germany Univ Munster Munster Germany D-48149 Phys Chem, D-48149 Munster, Germany
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-3, volume: 48, anno: 2001,
pagine: 11 - 22
SICI:
1387-1811(20011101)48:1-3<11:HSZWTS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALL-SILICA; BETA; FLUORIDE; OCTADECASIL; SYMMETRY;
Keywords:
large pore zeolites; zeolite beta; F-19 MAS NMR; double four rings; synthesis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Camblor, MA Ind Quim Ebro SA, Poligono Malp, Calle 97, Zaragoza 50057, Spain Ind Quim Ebro SA Calle 97 Zaragoza Spain 50057 a 50057, Spain
Citazione:
M.A. Camblor et al., "High silica zeolites with three-dimensional systems of large pore channels", MICROP M M, 48(1-3), 2001, pp. 11-22

Abstract

Several high silica zeolites with three-dimensional systems of large pore channels have been prepared in aqueous fluoride media: Beta, ITQ-7, ITQ-10 and ITQ-14. Pure silica beta can crystallize using up to 17 organic cationsconsiderably different in size, shape, rigidity and CIN ratios. There are clear differences in the powder X-ray diffraction patterns of calcined betamaterials prepared with different cations, suggesting structural differences between them. However, this technique cannot be readily used to get further insights into these differences. F-19 MAS NMR spectroscopy shows the existence of fluoride occluded in double four ring cages in most of the different betas, thus demonstrating for the first time the real occurrence in these intergrown materials of polymorphs different from A and B. Double four ring cages are also present in ITQ-7 and in the new ITQ-10 and ITQ-14 zeolites. (C) 2001 Elsevier Science BN. 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 16:56:53