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Organic additives and phosphoric acid are often reported to enhance the catalytic activity of MoS2-based hydrodesulfurization (HDS) catalysts, although the origin of their effect is not well understood. We did a systematic study on the effect of chelating and non-chelating additives on catalyst activation (1bar and 20bar H2/H2S) and on structure and activity of sulfided Mo/Al2O3 and CoMo/Al2O3 catalysts...
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