Kinetics of dehydration and textural characterizations of selectively leached vermiculites |
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| Authors: | A P M Alves A S Araujo F A Bezerra K S Sousa S J G Lima M G Fonseca |
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| Institution: | 1. Federal University of Rio Grande do Norte, Natal, RN, Brazil
2. Federal University of Paraiba, Jo?o Pessoa, PB, Brazil
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| Abstract: | Acid leaching of aluminosilicates is an interesting procedure for preparing high surface porous silica. Thermal behavior of vermiculite leached with a nitric acid solution at various concentrations was studied by thermogravimetry and differential scanning calorimetry. Activation energies of the dehydration process in selected temperature zones were determined by two different methods: Ozawa–Flynn–Wall and Friedman. The material obtained was characterized through Fourier transform infrared spectroscopy, X-ray diffraction, and nitrogen adsorption at 77 K to relate them to the estimated activation energies. |
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