Transformation of mesophase pitch into different carbons by heat treatment and KOH etching

Hsisheng Teng, To Chi Weng

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume50
Issue number1
DOIs
Publication statusPublished - 2001 Dec 15

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Etching
heat treatment
Carbon
Heat treatment
etching
carbon
porosity
Porosity
Crystallite size
Powders
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

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abstract = "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.",
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Transformation of mesophase pitch into different carbons by heat treatment and KOH etching. / Teng, Hsisheng; Weng, To Chi.

In: Microporous and Mesoporous Materials, Vol. 50, No. 1, 15.12.2001, p. 53-60.

Research output: Contribution to journalArticle

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