Kinetic study of template removal of Al-MCM-41 synthesized at room temperature

被引：0
|
作者：
Cristiane P. de Macedo
Charles A. B. Negrão
Luiz G. M. de Macedo
José R. Zamian
Geraldo N. da Rocha Filho
Carlos E. F. da Costa
机构：
[1] Instituto de Ciências Naturais,Laboratório de Catálise e Oleoquímica, Faculdade de Química
[2] Universidade Federal do Pará,Faculdade de Biotecnologia
[3] Instituto de Ciências Biológicas,undefined
[4] Universidade Federal do Pará,undefined
来源：
Journal of Thermal Analysis and Calorimetry | 2014年 / 115卷
关键词：
Al-MCM-41; Activation energy; Model free kinetics; Room temperature synthesis;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The Al-MCM-41 molecular sieve with Si/Al = 20 molar ratio was synthesized at room temperature and characterized by X-ray diffractometry, surface area, thermogravimetry, and infrared spectroscopy. The kinetic study was conducted by Vyazovkin and Ozawa method, in order to verify the activation energy during the Hofmann degradation between 130 and 370 °C, in which most of surfactant removal occurs. The results suggest that the activation energy for template removal is close to 80 kJ mol−1 lower in Al-MCM-41 synthesized at room temperature, when compared to results obtained for mesopores Al-MCM-41 and MCM-41 synthesized by hydrothermal method. This lower activation energy may be understood as consequence of textural properties, such as higher pore size.
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页码：31 / 36
页数：5
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