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Highly microporous nitrogen-doped carbons from anthracite for effective CO2 capture and CO2/CH4 separation

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  • Li, Yao
  • Liu, Nan
  • Zhang, Tao
  • Wang, Binbin
  • Wang, Yan
  • Wang, Lanyun
  • Wei, Jianping

Abstract

The goal of this study is to develop a cost-efficient carbon adsorbent for effective CO2 capture and CO2/CH4 separation. Using anthracite as the precursor, highly microporous nitrogen-doped (N-doped) carbons are fabricated through a combination of KOH activation and urea treatment. The as-prepared carbon samples possess developed microporosity and large nitrogen content. The sample synthesized under mild KOH/anthracite ratio (KOH/anthracite = 2), following with urea treatment shows a remarkable CO2 uptake of 4.46 mmol g−1, among the highest achieved for N-doped porous carbons. This high CO2 capture capability should be attributed to the synergistic effect of large amount of narrow micropores (pore with＜1 nm) and nitrogen doping in the carbon adsorbent. Experiment evidence suggests that nitrogen doping contributes much on CO2/CH4 selectivity than that on CO2 capture. According to ideal adsorption solution theory (IAST), assuming different binary mixture proportions of 50/50, 30/70 and 15/85, the sample possessing the largest nitrogen content (6.48 wt %) exhibits CO2/CH4 IAST selectivities of 8.83, 7.02 and 8.09, respectively. Combining excellent CO2 capture capacity and desirable CO2/CH4 separation property, the microporous N-doped carbons prepared in this work appear to be a very promising candidate for greenhouse gas treatment and natural gas upgrading.

Suggested Citation

  • Li, Yao & Liu, Nan & Zhang, Tao & Wang, Binbin & Wang, Yan & Wang, Lanyun & Wei, Jianping, 2020. "Highly microporous nitrogen-doped carbons from anthracite for effective CO2 capture and CO2/CH4 separation," Energy, Elsevier, vol. 211(C).
    • Handle: RePEc:eee:energy:v:211:y:2020:i:c:s0360544220316698
    DOI: 10.1016/j.energy.2020.118561
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    References listed on IDEAS

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    1. Liu, Jun & Ding, Jia-Xiang & Liang, De-Qing, 2018. "Experimental study on hydrate-based gas separation of mixed CH4/CO2 using unstable ice in a silica gel bed," Energy, Elsevier, vol. 157(C), pages 54-64.
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    3. Byamba-Ochir, Narandalai & Shim, Wang Geun & Balathanigaimani, M.S. & Moon, Hee, 2017. "High density Mongolian anthracite based porous carbon monoliths for methane storage by adsorption," Applied Energy, Elsevier, vol. 190(C), pages 257-265.
    4. Gang Xu & Feifei Liang & Yongping Yang & Yue Hu & Kai Zhang & Wenyi Liu, 2014. "An Improved CO 2 Separation and Purification System Based on Cryogenic Separation and Distillation Theory," Energies, MDPI, vol. 7(5), pages 1-19, May.
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