Effects of reaction temperature and partial pressure of hydrogen on the hydrogenation of a coal-derived middle distillate were examined over Ni-Mo/alumina catalyst. As the aromatics of naphthalene type were major components of the coal-derived middle distillate, hydrogenation of 1-methylnaphthalene was also examined to quantify the conversion rate of the hydrogenation of aromatics. The hydrogenation proceeded via first-order reaction, with respect to both the content of 1-methylnaphthalene and

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... he partial pressure of hydrogen. In conditions of modynamic limitation controlled the hydrogenation conversion of aromatics. At partial pressure of hydrogen around 12MPa, the thermodynamic limitation of the hydrogenation of aromatics was effectively released up to