Synergism in hydrodearomatization over Ni-Mo/Al2O3 catalyst

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Abstract
Synergism in hydrodearomatization activity of the Ni-Mo/Al2O3 system was studied using the hydrogenation of naphthalene to tetraline at 300 or 350 °C and 2.0 or 1.5 MPa as model reaction. The catalysts were either reduced or presulphided and the feed was either sulphur-free or contained small amount of benzothiophene. Two main conclusions are important for the theory of synergism in the hydrorefining catalysis: a) the Ni-Mo catalyst does not exhibit synergism in hydrodearomatization in the absence of sulphur in the system, b) in the presence of sulphur in the system, the synergism in hydrodearomatization occurrs probably only under special conditions and is less general and less pronounced than in the hydrodesulphurization.

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