Abstract
The effect of thermal pretreatment on the porous structure and adsorption properties of asphalt-based carbons activated with potassium hydroxide was investigated by FTIR, Raman spectroscopy, TEM, N2 and CO2 adsorption. Two series of the activated carbons were prepared by a one-stage method using KOH as the activating agent and a two-stage method including pretreatment of asphalt at 450 °C. A cross-effect of the KOH/asphalt ratio and pretreatment conditions on the characteristics of the porous structure of the activated carbons was revealed. The pretreatment of asphalt before activation is demonstrated to be a necessary stage for the effective control of the carbon porous structure by variation the KOH/asphalt ratio from 2 to 4. The porous carbon derived from petroleum asphalt exhibited the high CO2 adsorption capacity of 3.8 mmol/g at 25 °C and 1 atm and good selectivity for CO2 over N2, indicating possible applications in CO2 capture technology.
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Acknowledgements
We thank G.G. Savel’eva, Dr. A.V. Babenko and Dr. A.V. Vasilevich from the Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis for their valuable contribution to this research. This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis (project AAAA-AA21-121011890076-8). The research was performed using equipment of the Shared-Use Center “National Center for the Study of Catalysts” at the Boreskov Institute of Catalysis and Shared-Use Center at the Omsk Scientific Center, Siberian Branch of the Russian Academy of Sciences.
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Gorbunova, O.V., Baklanova, O.N., Gulyaeva, T.I. et al. Effect of thermal pretreatment on porous structure of asphalt-based carbon. J Mater Sci 57, 7239–7249 (2022). https://doi.org/10.1007/s10853-022-07106-x
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DOI: https://doi.org/10.1007/s10853-022-07106-x