Is it possible to reactivate hydrotreating catalyst poisoned by silicon?
| Autor: | Yu.V. Vatutina, E.A. Suprun, E. Yu. Gerasimov, Anton A. Gabrienko, O. A. Nikolaeva, K.A. Nadeina, Igor P. Prosvirin, I.G. Danilova, S. V. Budukva, Oleg V. Klimov, A. S. Noskov, Maxim O. Kazakov |
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| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Silicon Quinoline Sulfidation chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Dibenzothiophene Hydrodenitrogenation 0210 nano-technology Hydrodesulfurization Cobalt Nuclear chemistry |
| Zdroj: | Catalysis Today. 378:43-56 |
| ISSN: | 0920-5861 |
| Popis: | The feasibility of the reactivation of CoMo/Al2O3 hydrotreating catalysts poisoned by Si compounds has been studied. CoMo/Al2O3 catalysts poisoned with 3, 4 and 5 wt.% of silicon were obtained during hydrotreating of diesel fraction contaminated with decamethylcyclopentasiloxane. Catalysts poisoned by different amount of silicon were regenerated by oxidative treatment and subsequently reactivated using citric acid solution. The catalysts were studied by nitrogen adsorption-desorption method, CHNS analysis, UV–vis, thermal analysis, SEM, HRTEM, XPS. It was shown that the hydrodesulfurization activity of regenerated catalysts decreased with increasing silicon content. According to UV–vis results, the increase in Si content on the spent catalyst leads to the formation of CoOx oxides after oxidative regeneration. Probably, cobalt oxides do not promote MoS2 slabs during sulfidation, convert to inactive Co species and decrease hydrodesulfurization activity. After reactivation procedure, there was the increase in active component particles dispersion, while catalytic activity in hydrodesulfurization of dibenzothiophene and hydrodenitrogenation of quinoline increased. It was established that hydrodesulfurization and hydrodenitrogenation activities of CoMo/Al2O3 catalyst with less than 3 wt.% of Si could be completely restored by reactivation. |
| Databáze: | OpenAIRE |
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