High-porosity carbons prepared from bituminous coal with potassium hydroxide activation

Hsisheng Teng, Li Yeh Hsu

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Porous carbons with a very high porosity were prepared from an Australian bituminous coal with KOH activation. The preparation process consisted of KOH impregnation followed by carbonization in nitrogen at 500-1000°C for 0-3 h. Surface area and pore volume of the resulting carbons were found to increase with the carbonization temperature to a maximum at 800°C and then begin to decrease. It has been suggested that carbon gasification by the released CO2 and the oxygen in potassium containing compounds plays an important role in determining the pore structures. The porosity development was affected by the chemical ratio of KOH to coal. The optimum chemical ratio for preparing a high-porosity carbon varies with carbonization conditions. A process consisting of impregnation at a chemical ratio of 4.25 followed by carbonization at 800°C for 1 h was recommended for producing a high surface area (>3000 m2/g) carbon.

Original languageEnglish
Pages (from-to)2947-2953
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number8
Publication statusPublished - 1999 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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