Carbons with different physical structures were prepared from mesophase pitch powders by heat treatment and KOH etching at temperatures up to 900 °C. The crystallite size of the carbons derived from heat treatment of the pitch was found to be small, and little porosity was created in these carbons. However, high-porosity carbons can be prepared from heat treatment of the pitch that has been impregnated with KOH. The present work has demonstrated that this KOH-etching method can produce carbons with surface areas and pore volumes as high as 2900 m2/g and 1.7 cm3/g, respectively, with high yields of ≈ 30 wt.%. The influence of different parameters during the etching process, such as the etching temperature, residence time and KOH/pitch ratio, on the carbon yield and the surface characteristics has been explored. The porosity of the resulting carbons was found to increase with the etching extent to a maximum and then began to decrease upon further etching. The optimum conditions to produce high-porosity carbons were recommended.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials