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.

    Original languageEnglish (US)
    Pages (from-to)1055-1061
    Number of pages7
    JournalFuel
    Volume71
    Issue number9
    DOIs
    StatePublished - 1992

    Profile

    Oxidation
    Avian Leukosis
    Coal
    Bacillus megaterium
    Gasification
    Hydrogen
    Catalysts
    Afferent Loop Syndrome
    Deoxyglucose
    Potash
    Surface structure
    Carbon dioxide
    Steam
    Minerals
    Heat treatment
    Carbon
    Air
    Amoxapine
    Hot Temperature

    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, Vol. 71, No. 9, 1992, p. 1055-1061.

    Research output: Contribution to journalArticle

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    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.",
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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.

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