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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Zeolite metastability as a function of the composition of the surrounding solution: The case of faujasite and zeolite omega
Microporous and Mesoporous Materials, Volume 144, No. 1-3, Year 2011
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Description
The transient formation of faujasite has been observed during the synthesis of zeolite omega. The metastability between these zeolites has been studied by measuring their solubilities in alkaline solutions at temperature levels near to usual crystallization conditions. The use of silicate- and aluminate-enriched solutions has allowed to determine solubility curves at different alkalinity levels. The silicate concentration in solution controls the relative stability of the two structures. For Si/Al ratios in solution lower than 6-10 (80-115 °C), zeolite omega is more soluble than faujasite and can be dissolved to provide silicate and aluminate for the crystallization of aluminium-richer zeolite X. In the usual conditions for the synthesis of zeolite omega, with Si/Al in solution higher than 100, zeolite X is metastable and is dissolved to provide aluminate for the crystallization of silica-richer zeolite omega. © 2011 Elsevier Inc. All rights reserved.
Authors & Co-Authors
Bouchiba, Nabila
France, Montpellier
Institut Charles Gerhardt Montpellier
Algeria, Oran
Université Oran 1
Guzman Castillo, Maria
Mexico, Mexico City
Instituto Mexicano Del Petroleo
Bengueddach, Abdelkader E.K.
Algeria, Oran
Université Oran 1
Fajula, François
France, Montpellier
Institut Charles Gerhardt Montpellier
Di Renzo, Francesco
France, Montpellier
Institut Charles Gerhardt Montpellier
Statistics
Citations: 12
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/j.micromeso.2011.04.015
ISSN:
13871811