Thermogravimetric Studies on the Global Kinetics of Carbon Gasification in Nitrous Oxide

Hsisheng Teng, Hung Chi Lin, Ya Sheng Hsieh

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The global kinetics of the carbon gasification in N2O were determined with a thermogravimetric system. The carbon was a phenol-formaldehyde resin char of low impurity levels, and the burn-off range of the carbon in this study was 0-45%. The temperature range studied was 673-923 K, and the partial pressure of N2O was varied from 10.1 to 101 kPa. The kinetics can be divided into two temperature regimes. The low-temperature regime (<748 K) is characterized by an activation energy, which increases slightly with the extent of carbon burn-off, ranging from 57 to 66 kJ/mol. The high-temperature regime (>748 K) is exhibited by an activation energy, which is also an increasing function of the burn-off level, ranging from 170 to 230 kJ/mol. The reaction order with respect to the N2O partial pressure is not constant. The rate of gasification increases with the N2O pressure to a maximum and then begins to decrease with a further increase of the pressure.

Original languageEnglish
Pages (from-to)523-529
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number3
Publication statusPublished - 1997 Jan 1

All Science Journal Classification (ASJC) codes

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

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