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Titolo:
Several factors affecting Al-MCM41 synthesis
Autore:
Cesteros, Y; Haller, GL;
Indirizzi:
Yale Univ, Dept Chem Engn, New Haven, CT 06520 USA Yale Univ New Haven CTUSA 06520 Dept Chem Engn, New Haven, CT 06520 USA
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 2, volume: 43, anno: 2001,
pagine: 171 - 179
SICI:
1387-1811(200104)43:2<171:SFAAS>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
MESOPOROUS MOLECULAR-SIEVES; LIQUID-CRYSTAL TEMPLATE; STRUCTURAL ALUMINUM; MCM-41 TYPE; PORE-SIZE; STABILITY; ALUMINOSILICATE; ACIDITY; IMPROVEMENT; SITES;
Keywords:
synthesis; Al-MCM-41; anti-foam; aging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Haller, GL Yale Univ, Dept Chem Engn, POB 208286, New Haven, CT 06520 USA Yale Univ POB 208286 New Haven CT USA 06520 Haven, CT 06520 USA
Citazione:
Y. Cesteros e G.L. Haller, "Several factors affecting Al-MCM41 synthesis", MICROP M M, 43(2), 2001, pp. 171-179

Abstract

Several mesoporous aluminosilicate molecular sieves with the MCM-41 structure (Si/Al = 24) have been synthesized using different aluminum and silica sources and varying several synthesis parameters during the preparation process such as the use of an anti-foaming agent, prior aging of the gel mixture or pH adjustment of the gel mixture under basic conditions followed by autoclaving three times. All samples were characterized by X-ray diffraction(XRD), N-2 physisorption, TGA, (27)A1 MAS NMR and elemental analysis. There is a significant improvement in the structure by using an anti-foaming agent before adding the surfactant, by aging the mixture of silica and aluminum source prior to synthesis, and by using delta -alumina instead of PHF alumina. Also, when the sample is synthesized, alternating the pH adjustment and autoclaving three times in sequence, well-resolved XRD peaks are obtained. These A1-MCM-41 materials have BET areas around 1000 m(2)/g but the amount of tetrahedral coordinated Al, on the whole, is low. (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 30/03/20 alle ore 00:22:32