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

• Published in: Fuel processing technology Vol. 244; p. 107700
• Main Authors: Bai, Jiali, Huang, Jiamei, Yu, Qiyun, Demir, Muslum, Gecit, Fehime Hayal, Altay, Bilge Nazli, Wang, Linlin, Hu, Xin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2023
• Subjects: adsorption; carbon; carbon dioxide; CO2 adsorption; flue gas; heat; petroleum; Petroleum coke; Porous carbons; Self-S-doping; sulfur; surface area; synthesis; technology; Porous carbons; CO2 adsorption; Petroleum coke; Self-S-doping
• ISSN: 0378-3820; 1873-7188
• DOI: 10.1016/j.fuproc.2023.107700

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 °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. [Display omitted] •S-doped porous carbons were synthesized by a one-pot self-doped approach.•Petroleum coke with high sulfur content was used as raw materials.•The obtained carbon exhibits high CO2 uptake, 4.18 mmol g−1 at 25 °C and 1 bar.•Porous textual properties and S functionalities decide CO2 uptake.