The influence of hydrothermal modification on the structure and hydrodenitrogenation (HDN) activity of NiMo/-Al2O3 catalyst was studied in the range 140~180 ℃. The experimental results indicated that the hydrodenitrogenation reaction rate of pyridine was accelerated using the NiMo/-Al2O3 catalyst synthesized via hydrothermal route due to the change of the structure, the increase of the amount of Mo and Ni and the rise of the specific surface area. The change of the structure of catalysts was enhanced at higher hydrothermal temperature, producing NiMo/-Al2O3 catalyst with better HDN activity.
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