CO2 adsorption characteristics of slit-pore shaped activated carbon prepared from cokes with high crystallinity Park, Mi-Seon; Lee, Si-Eun; Kim, Min Il; Lee, Young-Seak;
High crystallinity coke-based activated carbon (hc-AC) is prepared using a potassium hydroxide solution to adsorb carbon dioxide (). The adsorption characteristics of the prepared hc-AC are investigated at different temperatures. The X-ray diffraction patterns indicate that pitch-based cokes prepared under high temperature and pressure have a high crystal structure. The textural properties of hc-AC indicate that it consists mainly of slit-like pores. Compared to other textural forms of AC that have higher pore volumes, this slit-pore-shaped hc-AC exhibits higher adsorption due to the similar shape between its pores and molecules. Additionally, in these high-crystallinity cokes, the main factor affecting adsorption at lower temperature is the pore structure, whereas the presence of oxygen functional groups on the surface has a greater impact on adsorption at higher temperature.
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