A series of Pt/γ-Al2O3 catalysts with different content of Pt were charact erized by using low-temperature FT-IR spectroscopy of adsorbed CO, while thei r catalytic activity for HDS was investigated with thiophene as a model substrat e. On the basis of the experimental results, it has been obtained that the pseud o zero order rate of the thiophene HDS reaction is well linearly proportional to the total area of the two IR bands at 2?080 and 1?850 cm-1 of CO adsorb ed on Pt/γ-Al2O3, and that the Pt sites for CO adsorption may be the activ e centers for thiophene HDS reaction.
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