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A deep hydrodesulfurization (HDS) catalyst, which was considerably active to desulfurize dibenzothiophene (DBT), was prepared by depositing Co–Mo species over siliceous MCM-41. The extremely high surface area of MCM-41 favors the dispersion of the active species, resulting in very high HDS activity. The optimal Co/Mo atomic ratio for this series of catalysts is 0.75, higher than the conventional γ-Al...
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