Structural and sorption properties of carbon replicas obtained by matrix carbonization of organic precursors in SBA-15 and KIT-6 |
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Authors: | N D Lysenko M V Opanasenko P S Yaremov A V Shvets V G Il’in |
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Institution: | (1) L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, Prospekt Nauky, 31, Kyiv, 03028, Ukraine |
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Abstract: | We have carried out a comparative study of matrix carbonization of some organic precursors (sucrose, polydivinylbenzene, polyphenol-formaldehyde,
polyacrylonitrile, acetonitrile) in SBA-15 and KIT-6 silica mesoporous molecular sieves. We have shown that carbon mesoporous
molecular sieves of the CMK-8 type, obtained in KIT-6 mesopores, have better adsorption characteristics due to the features
of the three-dimensional cubic structure, the larger pore volume and thickness of the walls of the framework. The maximum
micropore volume is observed in CMK-3 and CMK-8, obtained by carbonization of polyphenol-formaldehyde and polydivinylbenzene,
while the greatest specific surface area is observed on carbonization of sucrose, where the maximum hydrogen adsorption capacity
is achieved at a level of ∼1.4 wt.% (77 K, 1 atm). We show that the mesopore surface coverage by hydrogen in carbon mesoporous
molecular sieves increases as the degree of graphitization increases. |
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