Pt/Al2O3, Pd/Al2,O3. and Pd/TiO2 catalysts were compared to a commercial hydrotreating catalyst, NiMo/Al2O3, for naphthalene hydrogenation inside tubing bombs at 553 K with a cold feed (at room temperature) of 6.99 MPa H2 and tridecane as the solvent. The noble metal catalysts were found to be significantly more active than NiMo/Al2O3. A further study at a reaction temperature of 473 K showed that naphthalene hydrogenation over these noble metal catalysts can proceed even in the presence of benzothiophene at a concentration of 4200 ppm. Sulfur addition does decrease the activity of all the noble metal catalysts. However, Pd catalysts appear to have higher sulfur resistance than the Pt catalyst; Pd/TiO2 catalyst was found to be the most active and the least affected by benzothiophene among the three noble metal catalysts studied.
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