| 초록 |
In this study, kenaf-based activated carbons were prepared using the two-step activation process to enhance their butane working capacity (BWC). In the 1-step, kenaf precursors were impregnated with H3PO4 solution, and heat treatment at each temperature (25-200℃). In the 2-step, the heat-treated kenaf was steam-activated at 900℃. Thermal characteristics of the heat-treated kenaf were observed by thermogravimetry. Textured properties and structural characterization of the activated carbons were investigated by N2/77K adsorption isotherms and X-ray diffraction, respectively. The BWC was studied according to the ASTM D5228. From the result, specific surface areas and total pore volume of the activated carbons were found to be 1100-1900 m2/g and 0.50-0.90 cm3/g, respectively*. The correlation between the butane activity & retentivity and the pore characteristics of the activated carbon was studied in the diameter range of 1-4 nm and 5-7 nm. |
