Impact of support on the catalytic behavior of Mo/γ-Al2O3 and Mo/MgO catalysts on the desulfurization reaction
| Autor: | M. Ardjmand, Morteza Bahmani, H. Ahmadpanahi, Amir Heidarinasab, Mohammad Soltanieh |
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| Rok vydání: | 2016 |
| Předmět: |
Reaction mechanism
010405 organic chemistry Chemistry Process Chemistry and Technology Inorganic chemistry Atmospheric temperature range 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Flue-gas desulfurization chemistry.chemical_compound Adsorption Dibenzothiophene Pyridine Dibenzothiophene desulfurization |
| Zdroj: | Applied Catalysis A: General. 516:41-50 |
| ISSN: | 0926-860X |
| Popis: | This study uses the Taguchi method to evaluate the impact of support on the catalytic behavior of Mo/MgO and Mo/γ-Al 2 O 3 catalysts through the parametric effects on the kinetics of dibenzothiophene desulfurization reaction. The parameters studied were contact time, temperature, activation temperature, reaction gas type, sulfur concentration, pressure, and nitrogen concentration. Some discrepancies existed in the order of significance of the reaction parameters between the two catalysts. The compensation phenomena revealed a change in the reaction mechanism with temperature for Mo/MgO catalyst that approximates that of Mo/γ-Al 2 O 3 catalyst at higher temperatures. Transition state theory showed that for the Mo/MgO catalyst, the tight activation transition state mode is replaced with a loose mode at higher temperatures, whereas for the Mo/γ-Al 2 O 3 catalyst, the loose mode prevails across the entire temperature range studied. Furthermore, some temperature-dependent concentrations of SH and OH functional groups were detected at the catalyst surface, profoundly influencing the adsorption of the reactants and the inhibition effect of pyridine. |
| Databáze: | OpenAIRE |
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