One-pot synthesis of self S-doped porous carbon for efficient CO2 adsorption

Considering the rising environmental and efficiency concerns, the development of porous carbon via a surface decoration approach has received great attention for selectively adsorb CO2 from the flue gas. Herein, self-S-doped porous carbon was prepared from petroleum coke with high sulfur content (PHS) utilizing KOH as an activating agent. The effect of the activating temperatures and the KOH/PHS mass ratio on the physical feature and CO2 uptake performance of the as-synthesis porous carbons was fully examined. The optimal sample (PHS-650-3) presents the specific BET surface area and total pore volume of 1278 m2/g and 0.56 cm3/g, respectively. The PHS-650-3 sample displayed the maximum CO2 adsorption capacity of 4.18 and 5.57 mmol g-1 at 25 and 0 degrees C and 1 bar thanks to its enhanced textural characteristics and high amount of sulfur functionality on the surface. Last but not least, the as-synthesized S-doped porous carbon shows ideal adsorption solution theory (IAST) CO2/N2 selectivity of 21, fast adsorption kinetics, suitable heat of adsorption value and stable uptake capacity upon consecutive adsorption cycles, claiming its readily potential CO2 adsorption applications.

Automated summary

Considering environmental and efficiency concerns, the development of porous carbon for selectively adsorbing CO2 has gained attention. Self-S-doped porous carbon was prepared from petroleum coke using KOH as an activating agent. The optimal sample showed enhanced textural characteristics and high sulfur functionality, resulting in a maximum CO2 adsorption capacity and ideal CO2/N2 selectivity, indicating its potential CO2 adsorption applications.