Abstract
Oxygen chemisorption and catalytic activity for hydrodesulphurization of gas-oil on a series of Mo/γ-Al 2O 3 and Co (or Ni) Mo/γ-Al 2O 3, oxide catalysts were studied. A linear relationship between molybdena loading, up to about 15 wt % MoO 3, and equivalent molybdena area suggests a high molybdenum dispersion on the alumina surface. Similar behaviour for hydrodesulphurization activity versus equivalent molybdena area was observed, except for the highest molybdena content where a slightly higher activity was found. The equivalent molybdena area in Co (or Ni) promoted molybdena catalysts was slightly smaller than that found in non-promoted molybdena catalysts. However, catalytic activity for hydrodesulphurization was much higher in Co (or Ni) promoted catalysts. These results indicate clearly that Co (or Ni) in Mo containing catalysts does not increase molybdenum dispersion.
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