Three-dimensionally ordered micromesoporous carbon as adsorbent for CO2 capture

0511166 - ÚSMH 2020 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Vorokhta, Maryna - Řimnáčová, Daniela - Pilař, Radim
Three-dimensionally ordered micromesoporous carbon as adsorbent for CO2 capture.
Proceedings of the 7th International Conference on Chemical Technology. Praha: Czech Society of Industrial Chemistry in cooperation with Czech Chemical Society, 2019 - (Veselý, M.; Hrdlička, Z.; Hanika, J.; Lubojacký, J.), s. 318-323. ISBN 978-80-88307-00-6.
[International Conference on Chemical Technology /7./. Mikulov (CZ), 15.04.2019-17.04.2019]
Institucionální podpora: RVO:67985891 ; RVO:61388955
Klíčová slova: 3DOmm carbon * CO2 adsorption * Freundlich fit * Isosteric heat
Obor OECD: Environmental sciences (social aspects to be 5.7); Physical chemistry (UFCH-W)
https://www.icct.cz/AngiologyKlon-ICCT/media/system/2019/ICCT-2019-Proceedings.pdf

In this work, ordered three-dimensionally micromesoporous carbon composed of large spherical mesopores 13 nm in diameter and small micropores with a mean micropore width of 1.46 nm, connecting the main spheres, was synthesized and investigated for CO2 capture ability at temperatures of 25°C, 35°C and 50°C, and at pressures up to 6.5 MPa. Because of the big pore volume occupying 3.62 cm3/g, composed of mesopores and micropores, the carbon sample showed very high adsorption capacity at high pressures. The highest CO2 adsorption capacity of 24.03 mmol/g was obtained at 25°C and at 5.5 MPa. As the temperature increased, the CO2 adsorption capacity decreased to 13.34 mmol/g at 50°C and at 6.5 MPa. The Freundlich fittings of the measured adsorption isotherms at pressures up to 2 MPa showed very high correlation coefficients. The estimated isosteric heats of adsorption in the range of 5.62-6.90 kJ/mol indicated a physical adsorption process, and suggested a stronger interaction between CO2 molecules than between CO2 molecules and the surface of the carbon sample.
Trvalý link: http://hdl.handle.net/11104/0301504