Abstract: Investigation into the temperature programmed reduction (TPR) of bulk or γ-Al2O3 supported molybdenum trioxide using nhexane as a carbon source in hydrogen was carried out. The resulting catalyst was evaluated using dibenzothiophene (DBT) as a model compound for hydrodesulfurization (HDS). The results showed that the utilization of n-hexane can lower the temperature, to fulfill carburization to some extent. For DBT HDS, however, there existed an optimal temperature at which carburization was carried out, leading to a high activity of the resulting catalyst. In these experiments, it was found that the resulting catalyst exhibited the highest DBT HDS activity if the precursor, MoO3/γ-Al2O3, with 30% theoretic loading, was carburized at 620℃ under atmospheric pressure and 0.025 mol ratio of nhexane to hydrogen in carburizing reagents.