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Gas-phase activation and liquid-phase activation were compared for a suite of CoMo/Al2O3 catalysts with phosphoric acid (PA) and/or citric acid (CA) as additives. Gas-phase activation was carried out in 1 or 20bar H2/H2S(10%), whereas liquid-phase activation comprised sulfidation in a model diesel feed, spiked with dimethyldisulfide and 20bar H2. Full sulfidation of calcined precursors was difficult...
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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