One-pot synthesis of high N-doped porous carbons derived from a N-rich oil palm biomass residue in low temperature for CO2 capture

Summary Porous carbon materials have been widely used for CO 2 adsorption, but their preparation was subject to conditions such as raw material cost, activator corrosion, and temperature. In this study, nitrogen-doped porous carbonaceous adsorbents were prepared in a low temperature region (400-550°C) by one-step composite nitrogen doping method, using low-cost oil residue as raw materials and less corrosive NaNH 2 as activator. The CO 2 adsorption performances of the prepared N-doped porous adsorbents were systematically explored. The results showed that optimal oil residue-derived carbonaceous adsorbent owned excellent amount of CO 2 adsorption up to 3.51 and 5.63 mmol/g at 298 and 273 K under 1 bar, respectively. It was discovered that the congenerous influences of porous structure, nitrogen content and V n of the adsorbent affected their CO 2 adsorption performances under 1 bar. Importantly, these oil residue porous carbonaceous adsorbent also was verified owning fine selectivity of the CO 2 over N 2 (15.7), which attributed to its high V n and nitrogen content. Furthermore, optimal sample OAC-500-2.5 owned medium Q st (21-26 kJ/mol), which was beneficial practical application. This work may inspire new sparks on novel nitrogen-doped adsorbent with inexpensive precursor, low activation temperature and simple preparative tactic, indicating that the nitrogen-doped sample is promising in the practical situation of CO 2 adsorption.