Thermogravimetry applied to characterization of SBA-15 nanostructured material

被引：23

作者：

Coutinho, Ana Carla S. L. S.

Quintella, Solange A.

Araujo, A. S. ^{[1
]}

Barros, Joana M. F.

Pedrosa, Anne M. G.

Fernandes, V. J., Jr.

Souza, M. J. B.

机构：

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

[2] Fed Univ Sergipe, Dept Chem Engn, BR-49000000 Sao Cristovao, SE, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2007年 / 87卷 / 02期

关键词：

model-free kinetics; SBA-5; thermogravimetry;

D O I：

10.1007/s10973-005-7371-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Nanoporous silica with narrow pore size distribution has attracted increasing attention as a novel material for separations and reactions involving large molecules. SBA-15 has been synthesized in an acidic medium using a triblock copolymer as template. In this work, the SBA-15 was synthesized by the hydrothermal treatment at 373 K for 48 h, of a gel with the following overall molar composition: 1.0TEOS:0.017P123:5.7HCl:193H(2)O, where TEOS is tetraethyl orthosilicate and P123 is poly(ethylene oxide, propylene oxide and 1,4-dioxane). The obtained material was characterized by thermogravimetry, X-ray diffraction, infrared spectroscopy and BET surface area. A kinetic study using the model free model was accomplished in the stage of decomposition of the template (P123). The obtained value of the apparent activation energy was ca. 131 kJ mol(-1).

引用

页码：457 / 461

页数：5

共 20 条

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