Geopolymers
Inorganic polymeric new materials
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Ana C. R. Melo
Ana C. R. Melo
Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil
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Edjane F. B. Silva
Edjane F. B. Silva
Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil
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Larissa C. L. F. Araujo
Larissa C. L. F. Araujo
Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil
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Mirna F. Farias
Mirna F. Farias
Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil
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Antonio S. Araujo
Antonio S. Araujo
Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil
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Abstract
In this study, were studied the degradation of pure sunflower oil and mixed with H-Beta zeolite. This zeolite was synthesized by the hydrothermal method, followed by calcination and ion exchanged. The characterization of the zeolite was performed by X-ray diffraction and nitrogen adsorption/desorption by the method of BET. The analysis showed that H-Beta zeolite presented a good crystallinity and the template was completely removed from the catalyst. The thermal and catalytic degradation study was carried out using the TG/DTG method in multiple heating rates of 5, 10, and 20 °C min−1. The isoconversion method proposed by Vyazovkin was applied to determine the kinetic parameters for degradation of the sunflower oil. The activation energy for the degradation process of pure sunflower oil was 193 kJ mol−1, while for sunflower oil mixed with 20% of H-Beta zeolite was equivalent to 88 kJ mol−1. It was verified that for the degradation of 90% of the sunflower oil mixed with H-Beta, for a period of 1 h, a temperature of 356 °C was required, whereas for the pure vegetable oil, this value was of 387 °C, at the same time period, showing that the catalyst was effective for the degradation process of sunflower oil.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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