Abstract
The kinetics of coke combustion was investigated by using a thermogravimetric analyzer (TGA) of coked catalysts which was used for propane dehydrogenation to determine the activation energy. Apart from the Pt/Al2O3 catalyst, four different Pt-Sn/Al2O3 catalysts were prepared by varying the Pt/Sn ratio from 3: 0.5 to 3: 3 by weight. The catalytic activity was measured by propane dehydrogenation at 620 °C. The reactant mixture consisting of C3H8 (30 ml/min) and H2 (30 ml/min) was fed into the reactor for 5 h. A thermogravimetric analyzer in the presence of air was used to determine the amount of coke deposited and calculate the kinetic parameters for coke combustion. Three non-isothermal models (Friedman, Flynn-Wall-Ozawa (FWO), and Kissinger-Akahira-Sunose) were used to determine the activation energy and the best model to fit the experimental data. The FWO model provided the best fit for 3Pt/Al2O3 and 3Pt-0.5Sn/Al2O3. The three models were equivalent for fitting the data for 3Pt-1Sn/Al2O3, 3Pt-2Sn/Al2O3, and 3Pt-3Sn/Al2O3. The activation energy increased with increasing Sn addition in the 3Pt/Al2O3 catalyst. Differences in the locations and the qualitative features of the cokes were suggested to interpret the results.
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Acknowledgements
This work was financed by the industry core-technology project termed “Development of High Yield Propylene Production Process Technology” of the Ministry of Trade, Industry, and Energy (project No.: 100052754; Korea Evaluation Institute of Industrial Technology), and by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1D1A1B03034244).
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Nasution, P.S., Jung, JW., Oh, K. et al. Coke combustion kinetics of spent Pt-Sn/Al2O3 catalysts in propane dehydrogenation. Korean J. Chem. Eng. 37, 1490–1497 (2020). https://doi.org/10.1007/s11814-020-0536-z
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DOI: https://doi.org/10.1007/s11814-020-0536-z