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High crystallinity coke-based activated carbon (hc-AC) is prepared using a potassium hydroxidesolution to adsorb carbon dioxide (CO2). The CO2 adsorption characteristics of theprepared hc-AC are investigated at different temperatures. The X-ray diffraction patternsindicate that pitch-based cokes prepared under high temperature and pressure have a highcrystal structure. The textural properties of hc-AC indicate that it consists mainly of slit-likepores. Compared to other textural forms of AC that have higher pore volumes, this slit-poreshapedhc-AC exhibits higher CO2 adsorption due to the similar shape between its pores andCO2 molecules. Additionally, in these high-crystallinity cokes, the main factor affecting CO2adsorption at lower temperature is the pore structure, whereas the presence of oxygen functionalgroups on the surface has a greater impact on CO2 adsorption at higher temperature.

CO2adsorption characteristics of slit-pore shaped activated carbon prepared from cokes with high crystallinity

CO₂adsorption characteristics of slit-pore shaped activated carbon prepared from cokes with high crystallinity