Zeolite metastability as a function of the composition of the surrounding solution: The case of faujasite and zeolite omega

被引：10
作者：
Bouchiba, N. [1 ,2 ]
Guzman Castillo, M. L. A. [3 ]
Bengueddach, A. [2 ]
Fajula, F. [1 ]
Di Renzo, F. [1 ]
机构：
[1] ESCM, Inst Charles Gerhardt Montpellier, CNRS, ENSCM,UM1,UM2,UMR 5253, F-34296 Montpellier 5, France
[2] Univ Oran Es Senia, Lab Chem Mat, El Mnaouer, Oran, Algeria
[3] Inst Mexicano Petr, Mexico City 07730, DF, Mexico
来源：
MICROPOROUS AND MESOPOROUS MATERIALS | 2011年 / 144卷 / 1-3期
关键词：
Mazzite; Zeolite X; Zeolite Y; Dissolution; Crystallization; SODIUM-HYDROXIDE SOLUTIONS; BASIC AQUEOUS-SOLUTIONS; MESOPOROUS MATERIALS; CRYSTALLIZATION; SOLUBILITY; MAZZITE; DISSOLUTION; KINETICS; PRECURSORS; MORDENITE;
D O I：
10.1016/j.micromeso.2011.04.015
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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 degrees 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. (C) 2011 Elsevier Inc. All rights reserved.
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页码：195 / 199
页数：5
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