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Titolo:
Effect of aluminum on the formation of zeolite MCM-22 and kenyaite
Autore:
Cheng, MJ; Tan, DL; Liu, XM; Han, XW; Bao, XH; Lin, LW;
Indirizzi:
Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China Chinese Acad Sci Dalian Peoples R China 116023 n 116023, Peoples R China
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 2-3, volume: 42, anno: 2001,
pagine: 307 - 316
SICI:
1387-1811(200102)42:2-3<307:EOAOTF>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-SIEVE; CATALYSTS; CRYSTALLIZATION; MAGADIITE; ANALOG;
Keywords:
MCM-22; kenyaite; hexamethyleneimide; hydrothermal synthesis; solid state NMR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Bao, XH Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, 457 Zhongshan Rd, Dalian 116023, Peoples R China Chinese Acad Sci 457 Zhongshan Rd Dalian Peoples R China 116023 a
Citazione:
M.J. Cheng et al., "Effect of aluminum on the formation of zeolite MCM-22 and kenyaite", MICROP M M, 42(2-3), 2001, pp. 307-316

Abstract

The synthesis of zeolite MCM-22 and kenyaite under static hydrothermal conditions using hexamethyleneimide (HMI) as a directing agent was investigated. Kenyaite was the favored product instead of the purr silica analogue of MCM-22 for a pure silica synthesis mixture. With increasing SiO2/Al2O3 ratio, the crystallized products varied from purr MCM-22 to a mixture of MCM-22and kenyaite, and finally pure layered silicate kenyaite. The fraction of MCM22 crystallites increases, whilst that of kenyaite decreases with the aluminum content. All the products occlude HMI molecules, and the amount of HMI increases with the aluminum content. MCM-22 and kenyaite have different layer structures, but the Si atoms in the HMI-included kenyaite have similar NMR chemical shifts as those in MCM-22. Aluminum atoms, which are presentas tetrahedral framework species, are most possibly incorporated into the framework of MCM-22 only. The presence of aluminum seems to be critical forthe formation of MCM-22 zeolite. (C) 2001 Elsevier Science B.V. All rightsreserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 15:21:17