Effect of heat treatment temperature on CO2 capture of nitrogen‐enriched porous carbon fibers

Xue‐Fei Wang, Long Xiong, Li Li and Jun‐Jun Zhong

Greenhouse Gases: Science and Technology, 2020, vol. 10, issue 2, 461-471

Abstract: Porous carbon fibers (PCFs) were prepared from porous polyacrylonitrile fibers by cross‐linking, oxidation, and carbonization. X‐ray diffraction patterns revealed that graphite structures as well as disordered carbon coexisted in the PCFs. Nitrogen content was more than 15.3 wt% with the variation of oxidation temperature, and a maximum value was obtained at 275°C. Nitrogen was quickly released with carbonization temperature. Compared with the fiber prepared at elevated carbonization temperatures, those owning high nitrogen contents deserved better carbon dioxide (CO2) adsorption performance in the simulated flue gas environment (10% CO2/90% N2). The CO2 adsorption had a better relationship with nitrogen content rather than specific surface area and pore volumes. Especially, nitrogen was very useful to enhance the CO2 adsorption of the fibers with low microporosity. The heat of CO2 adsorption was in the range of 39.8–54.6 kJ mol−1, which indicated good selectivity of CO2 adsorption. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:10:y:2020:i:2:p:461-471

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