Sustainable CO2 Capture: N,S-Codoped Porous Carbons Derived from Petroleum Coke with High Selectivity and Stability

文献类型： 外文期刊

第一作者： Shao, Jiawei

作者： Shao, Jiawei;Wang, Yingyi;Che, Mingyang;Liu, Ya;Jiang, Yongfu;Hu, Xin;Xiao, Qiang;Demir, Muslum;Demir, Muslum;Wang, Linlin

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关键词： N,S-codoped porous carbons; CO2 adsorption; petroleum coke; thiourea

期刊名称：MOLECULES （ 影响因子：4.6； 五年影响因子：5.0 ）

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年卷期： 2025 年 30 卷 2 期

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收录情况： SCI

摘要： CO2 capture from the flue gas is a promising approach to mitigate global warming. However, regulating the carbon-based adsorbent in terms of textural and surface modification is still a challenge. To overcome this issue, the present study depicts the development of cost-effective and high-performance CO2 adsorbents derived from petroleum coke, an industrial by-product, using a two-step process involving thiourea modification and KOH activation. A series of N,S-codoped porous carbons was synthesized by varying activation temperatures and KOH quantity. The optimized sample exhibited a high specific surface area of 1088 m2/g, a narrow micropore volume of 0.52 cm3/g, and considerable heteroatom doping (1.57 at.% nitrogen and 0.19 at.% sulfur). The as-prepared adsorbent achieved a CO2 adsorption capacity of 3.69 and 5.08 mmol/g at 1 bar, 25 degrees C and 0 degrees C, respectively, along with a CO2/N-2 selectivity of 17. Adsorption kinetics showed 90% of equilibrium uptake was achieved within 5 min, while cyclic studies revealed excellent stability with 97% capacity retention after five cycles. Thermodynamic analysis indicated moderate isosteric heat of adsorption (Qst) values ranging from 18 to 47 kJ/mol, ensuring both strong adsorption and efficient desorption. These findings highlight the potential of petroleum coke-derived porous carbons for sustainable and efficient CO2 capture applications.

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