Adsorptive Removal of Nitrogen-Containing Compounds from Fuel

The feasibility of using microporous and mesoporous materials as adsorbents to remove nitrogen-containing compounds (NCCs) in fuel, such as pyridine, quinoline, pyrrole, and indole, was explored. A mesoporous molecular sieve Ti−HMS was chosen as the optimum adsorbent for the adsorptive denitrogenation (ADN) of fuel. Effect of adsorption time, temperature, and ratio of adsorbent to oil (A/O) on the removal of NCCs was investigated. Meanwhile, the adsorption isotherms and adsorption thermodynamics were studied. The thermodynamic functions show that the adsorption of NCCs on Ti−HMS is an exothermic, irregularity decreased, spontaneous physical process. Furthermore, the adsorption process primarily occurs in the pores of Ti−HMS, which is confirmed by comparing the adsorptive denitrogenation performance of Ti−HMS with uncalcined Ti−HMS.