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Effect of heat treatment temperature on CO 2 capture of nitrogen‐enriched porous carbon fibers
Author(s) -
Wang XueFei,
Xiong Long,
Li Li,
Zhong JunJun
Publication year - 2020
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1904
Subject(s) - carbonization , polyacrylonitrile , adsorption , nitrogen , flue gas , porosity , materials science , carbon fibers , chemical engineering , graphite , fiber , carbon dioxide , specific surface area , atmospheric temperature range , chemistry , polymer , composite material , organic chemistry , catalysis , physics , composite number , meteorology , engineering
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 (CO 2 ) adsorption performance in the simulated flue gas environment (10% CO 2 /90% N 2 ). The CO 2 adsorption had a better relationship with nitrogen content rather than specific surface area and pore volumes. Especially, nitrogen was very useful to enhance the CO 2 adsorption of the fibers with low microporosity. The heat of CO 2 adsorption was in the range of 39.8–54.6 kJ mol −1 , which indicated good selectivity of CO 2 adsorption. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.