Thermogravimetric investigations during the synthesis of silica-based MCM-41

被引：36

作者：

Araujo, SA

Ionashiro, M

Fernandes, VJ

Araujo, AS

机构：

[1] UNESP, Inst Chem, BR-14801970 Ararquara, SP, Brazil

[2] Univ Fed Rio Grande Norte, Dept Chem, BR-59078970 Natal, RN, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2001年 / 64卷 / 02期

关键词：

hydrothermal synthesis; MCM-41; thermogravimetry;

D O I：

10.1023/A:1011564916290

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

MCM-41 material was synthesized starting from hydrogel containing colloidal fumed silica, sodium silicate, cetyltetramethylammonium bromide (CTMABr) as surfactant, and distilled water as solvent. These reactants were mixed to obtain a gel with the following composition: 4SiO(2):1Na(2)O:1CTMABr:200H(2)O. The hydrogel with pH=14 was hydrothermally treated at 100 degreesC, for 4 days. Each day, the pH was measured, and then adjusted to 9.5-10 by using 30% acetic acid solution. Thermogravimetry was the main technique, which was used to monitor the participation of the surfactant on the MCM-41 nanophase, being possible to determine the temperature ranges relative to water desorption as well as the surfactant decomposition and silanol condensation.

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页码：801 / 805

页数：5

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