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Increased CO2 selectivity of asphalt-derived porous carbon through introduction of water into pore space

Author

Listed:
  • Almaz S. Jalilov

    (Rice University
    King Fahd University of Petroleum and Minerals)

  • Yilun Li

    (Rice University)

  • Carter Kittrell

    (Rice University
    Rice University)

  • James M. Tour

    (Rice University
    Rice University
    Rice University
    Rice University)

Abstract

The development of inexpensive porous solid sorbents, such as porous carbons, that can selectively capture carbon dioxide (CO2) from natural gas wells is essential to reduce emission of CO2 to the atmosphere. However, at higher pressures, the selectivity for CO2 over that for methane (CH4) remains poor. Here we show that H2O can be imbibed within asphalt-derived porous carbon, with a surface area of 4,200 m2 g−1, to generate a hydrated powder material. While maintaining a high CO2 uptake capacity of 48 mmol g−1 (211 wt%), the molar selectivity for CO2 over CH4 increases to >200:1 and the H2O remains within the pores on repeated cycling. To mimic realistic natural gas wells, we used a 90% CH4 and 10% CO2 gas mixture and showed selective CO2 separation at 20 bar. Furthermore, in situ vibrational spectroscopy reveals the formation of an ordered matrix within the pores consisting of gas hydrates.

Suggested Citation

  • Almaz S. Jalilov & Yilun Li & Carter Kittrell & James M. Tour, 2017. "Increased CO2 selectivity of asphalt-derived porous carbon through introduction of water into pore space," Nature Energy, Nature, vol. 2(12), pages 932-938, December.
    • Handle: RePEc:nat:natene:v:2:y:2017:i:12:d:10.1038_s41560-017-0030-y
    DOI: 10.1038/s41560-017-0030-y
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    Cited by:

    1. Zhao, Yuejun & Fan, Guangjuan & Song, Kaoping & Li, Yilin & Chen, Hao & Sun, He, 2021. "The experimental research for reducing the minimum miscibility pressure of carbon dioxide miscible flooding," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).

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