Abstract
In this research, the effects of tin as a promoter for the Co/γ-Al2O3 catalyst on the kinetic parameters and mechanism of Fischer–Tropsch synthesis are examined. The investigation was conducted utilizing a fixed bed micro-reactor at the temperature range of 463–533 K, pressure of 2–8 bar, H2/CO feed ratio of 2, and space velocities (GHSV) of 3600 h−1 and 4200 h−1. Considering the mechanistic study and the Langmuir–Hinshelwood-Hougen-Watson (LHHW) theory, CO consumption rates were defined through four mechanisms and 16 kinetic models. Using nonlinear regression analysis, the models were adjusted to the experimental data. A kinetic model (\(-{r}_{CO}=\frac{\left(k{P}_{CO}{P}_{H2}\right)}{(1+a{P}_{CO}+b{P}_{H2}^{0.5}{)}^{2}})\) was selected as the best one based on the statistical criteria. The mechanism of this catalytic system was based on the enol reaction, involving the molecular adsorption of CO species and surface adsorption of H2 in a dissociative or associative manner. The activation energy for the optimum kinetic model was estimated as 31.69 kJ/mol. Tin promoter decreased the activation energy of γ-Al2O3 supported cobalt catalyst in the CO hydrogenation reaction.
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The authors’ sincere gratitude goes to the University of Sistan and Baluchestan for supporting this research.
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Pordeli, F., Zohdi, S.H., Mirzaei, A.A. et al. Kinetic modeling of Fischer–Tropsch synthesis in the presence of Sn promoted Co/γ-Al2O3 catalyst. Braz. J. Chem. Eng. (2023). https://doi.org/10.1007/s43153-023-00409-9
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DOI: https://doi.org/10.1007/s43153-023-00409-9