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Titolo:
MODELING OF ZEOLITE CRYSTALLIZATION - THE ROLE OF GEL MICROSTRUCTURE
Autore:
NIKOLAKIS V; VLACHO DG; TSAPATSIS M;
Indirizzi:
UNIV MASSACHUSETTS,DEPT CHEM ENGN AMHERST MA 01003 UNIV MASSACHUSETTS,DEPT CHEM ENGN AMHERST MA 01003
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 4-6, volume: 21, anno: 1998,
pagine: 337 - 346
SICI:
1387-1811(1998)21:4-6<337:MOZC-T>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUTOCATALYTIC NUCLEATION; L NANOCLUSTERS; KINETICS; GROWTH; CONTINUUM;
Keywords:
ZEOLITE; NUCLEATION; GROWTH; GEL; MICROSTRUCTURE MODELING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
V. Nikolakis et al., "MODELING OF ZEOLITE CRYSTALLIZATION - THE ROLE OF GEL MICROSTRUCTURE", MICROPOROUS AND MESOPOROUS MATERIALS, 21(4-6), 1998, pp. 337-346

Abstract

The population balance formulation has been employed in order to describe zeolite nucleation and growth from precursor gels. Emphasis is given on the role of gel microstructure in crystallization kinetics. Geldissolution and nucleation are treated as interfacial phenomena taking place at the boundary of the amorphous solid gel and the surroundingsolution. The random capillary model was used to describe the gel structure and its evolution. The simulation results capture the essentialfeatures of zeolite crystallization phenomenology and are in qualitative agreement with experimental results. The often observed maximum inthe nucleation rate at the early stages of gel to zeolite transformation under constant supersaturation is attributed to the increasing interfacial area during gel dissolution. Changes in the kinetic parameters (e.g, nucleation rate constant) considerably affect the overall crystallization kinetics and the final particle size distribution. Variation of the gel microstructure can have the same order of magnitude effects on the overall crystallization kinetics. (C) 1998 Elsevier ScienceB.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 23:32:21