Effect of oxidation and other treatments on hydrogasification rate of coal char

Martin E. Toomajian, Michael G. Lussier, Dennis J. Miller

Research output: Contribution to journalArticle

  • 16 Citations

Abstract

Hydrogasification of coal and other chars is a much slower process than steam or carbon dioxide gasification; moreover, the rate of gasification in pure hydrogen decreases sharply with conversion for most carbons. To better understand and overcome this rate behaviour, the effects of oxidation (partial burnoff in air at 375 °C), demineralization, heat treatment at 1000 °C, and K2CO3 addition on hydrogasification rate of Illinois No. 6 coal char and Saran char are investigated. Oxidation of partially hydrogasified or heat-treated chars results in up to a threefold increase in subsequent hydrogasification rate; the enhancement propagates for 5-10% conversion following oxidation. Partial burnoff prior to hydrogasification enhances the rate by only about 30% for 1-2% additional conversion. Addition of potassium carbonate catalyst eliminates the decay in rate for mineral-free chars. Oxidation and addition of catalyst enhance the rate of hydrogasification either by removing strongly chemisorbed hydrogen or by generating surface structure active in hydrogasification.

LanguageEnglish (US)
Pages1055-1061
Number of pages7
JournalFuel
Volume71
Issue number9
DOIs
StatePublished - 1992

Profile

Coal
Oxidation
Gasification
Hydrogen
Potash
Catalysts
Steam
Carbon Monoxide
Carbon Dioxide
Surface structure
Minerals
Carbon dioxide
Carbon
Heat treatment
Air

Keywords

  • coal char
  • hydrogasification
  • oxidation

ASJC Scopus subject areas

  • Organic Chemistry
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Effect of oxidation and other treatments on hydrogasification rate of coal char. / Toomajian, Martin E.; Lussier, Michael G.; Miller, Dennis J.

In: Fuel, Vol. 71, No. 9, 1992, p. 1055-1061.

Research output: Contribution to journalArticle

Toomajian, Martin E. ; Lussier, Michael G. ; Miller, Dennis J./ Effect of oxidation and other treatments on hydrogasification rate of coal char. In: Fuel. 1992 ; Vol. 71, No. 9. pp. 1055-1061
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N2 - Hydrogasification of coal and other chars is a much slower process than steam or carbon dioxide gasification; moreover, the rate of gasification in pure hydrogen decreases sharply with conversion for most carbons. To better understand and overcome this rate behaviour, the effects of oxidation (partial burnoff in air at 375 °C), demineralization, heat treatment at 1000 °C, and K2CO3 addition on hydrogasification rate of Illinois No. 6 coal char and Saran char are investigated. Oxidation of partially hydrogasified or heat-treated chars results in up to a threefold increase in subsequent hydrogasification rate; the enhancement propagates for 5-10% conversion following oxidation. Partial burnoff prior to hydrogasification enhances the rate by only about 30% for 1-2% additional conversion. Addition of potassium carbonate catalyst eliminates the decay in rate for mineral-free chars. Oxidation and addition of catalyst enhance the rate of hydrogasification either by removing strongly chemisorbed hydrogen or by generating surface structure active in hydrogasification.

AB - Hydrogasification of coal and other chars is a much slower process than steam or carbon dioxide gasification; moreover, the rate of gasification in pure hydrogen decreases sharply with conversion for most carbons. To better understand and overcome this rate behaviour, the effects of oxidation (partial burnoff in air at 375 °C), demineralization, heat treatment at 1000 °C, and K2CO3 addition on hydrogasification rate of Illinois No. 6 coal char and Saran char are investigated. Oxidation of partially hydrogasified or heat-treated chars results in up to a threefold increase in subsequent hydrogasification rate; the enhancement propagates for 5-10% conversion following oxidation. Partial burnoff prior to hydrogasification enhances the rate by only about 30% for 1-2% additional conversion. Addition of potassium carbonate catalyst eliminates the decay in rate for mineral-free chars. Oxidation and addition of catalyst enhance the rate of hydrogasification either by removing strongly chemisorbed hydrogen or by generating surface structure active in hydrogasification.

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