Abstract: Five denitrogenation adsorbents loaded with 1.4%, 2.6%, 3.8%, 5.0% and 6.2% of nickel respectively were prepared by volumetric impregnation method using chromatographic silica gel as carrier. The adsorptive denitrogenation performances of the prepared adsorbents were investigated on a laboratory batch device under the conditions of an adsorption temperature of 120 ℃ and oil to adsorbent mass ratio of 60, using model diesel samples with initial nitrogen content of 1 000 μg/g containing indole or quinoline respectively. Test results show that the adsorption of quinoline and indole on the nickel containing adsorbent is characterized by multi-molecular layer adsorption significantly, and the best equilibrium adsorption capacity for quinoline and indole is obtained with adsorbent having Ni content of 5.0% and 2.6%, respectively. By studying the effect of adsorption temperature, it can be seen that for quinoline and indole, the optimum adsorption temperature is 100℃/120℃ and 140℃, respectively.

Key words: adsorptive denitrogenation, adsorbent, chromatographic silica gel, diesel fuel, equilibrium adsorption capacity, indole, quinoline