Journal of CO2 Utilization ( IF 5.993 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.jcou.2020.101164 Jinsong Shi; Hongmin Cui; Jianguo Xu; Nanfu Yan; Yuewei Liu; Shaowei Zhang
In the current work, we reported the synthesis of nitrogen doped carbons (NDCs) with a very convenient one-step strategy. Highly porous NDCs were successfully prepared from the direct pyrolysis of potassium phthalimide at 600−900 °C. The obtained carbon had a high specific surface area (2053 m2/g) and pore volume (1.14 cm3/g) after pyrolysis at 900 °C. The nitrogen content of the carbon was 3.3–9.1 wt%, and decreased with the increase of pyrolysis temperature. The combination of high porosity and nitrogen content made the synthesized NDCs attractive CO2 adsorbents. At 25 °C, the carbon exhibited CO2 uptakes of 1.1 mmol/g at 0.15 bar, and 3.4 mmol/g at 1 bar. The experiment results also revealed a linear relationship between the uptake at 0.15 bar and the CO2/N2 adsorption selectivity. Small micropores and nitrogen containing functionalities had decisive effects on these properties.