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Received December 16, 2019
Accepted March 8, 2020
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Coke combustion kinetics of spent Pt-Sn/Al2O3 catalysts in propane dehydrogenation
Department of Chemical Engineering, RCCT, Hankyong National University, Anseong 456-749, Korea 1Chemical and Environmental Technology Department, Inha Technical College, Inha-ro 100, Michuhol-gu, Incheon 22212, Korea
hlkoh@hknu.ac.kr
Korean Journal of Chemical Engineering, September 2020, 37(9), 1490-1497(8), 10.1007/s11814-020-0536-z
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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 (30ml/ min) and H2 (30ml/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 nonisothermal 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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