Dibenzothiophene hydrodesulfurization using in situ generated hydrogen over Pd promoted alumina-based catalysts
2011
Muhammad, Yaseen | Li, Chunxi
Catalytic hydrodesulfurization (HDS) of dibenzothiophene (DBT) was carried out in a temperature range of 320–400°C using in situ generated hydrogen via steam reforming of ethanol and the effect of some organic additives was studied for the first time. Four kinds of alumina-based catalysts, i.e. Co–Mo/Al₂O₃, Ni–Mo/Al₂O₃ and their corresponding Pd promoted catalysts Pd–Co–Mo/Al₂O₃ and Pd–Ni–Mo/Al₂O₃, prepared through incipient impregnation method, were used for the desulfurization process. Catalytic activity was investigated in a batch autoclave reactor in the complete absence of external hydrogen gas. Experiments showed that organic additives like diethylene glycol (DEG), phenol, naphthalene, anthracene, o-xylene, tetralin, decalin and pyridine can affect the HDS activity of the catalysts in different ways, and only naphthalene is inhibitive for the catalytic activity towards HDS. The results showed that Ni-based catalysts are more active than Co-based ones while Pd shows a high promotion effect. DBT conversion of up to 97% was achieved with Pd–Ni–Mo/Al₂O₃ catalyst at 380°C temperature and 13h reaction time. Catalyst systems followed the HDS activity order of: Pd–Ni–Mo/Al₂O₃>Ni–Mo/Al₂O₃>Pd–Co–Mo/Al₂O₃>Co–Mo/Al₂O₃ at all conditions. Qualitative analysis of the products stream was carried out using GC–MS technique. The present HDS process using in situ generated hydrogen might be applied as an alternative approach for the catalytic HDS of DBT on industrial level due to its cost effectiveness, mild operating conditions and high activity of the catalysts.
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