In order to increase the adsorption capacity of activated carbon (AC) for adsorptive denitrogenationen (ADN) of liquid hydrocarbon streams, oxidative modification of a commercial AC was conducted using (NH4)2S2O8 as an oxidant. The effects of (NH4)2S2O8 concentration, oxidation temperature, and oxidation time on the concentration of the oxygen-containing functional groups on the AC were examined. The oxygen-containing functional groups in the modified AC samples were identified and quantified by the temperature programmed desorption method (TPD-MS). The ADN performance of the modified adsorbent was evaluated. It was found that the oxidative modification increased the concentration of the oxygen-containing functional groups on AC from initial 6.2 mmol-O/g-A to 25.9 mmol-O/g-A. It resulted in a significant increase of the ADN capacity by a factor of 2.8, indicating that the oxidative modification with (NH4)2S2O8 as an oxidant is very effective in increasing the ADN capacity of AC.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)