Interaction between potassium carbonate and carbon substrate at subgasification temperatures. Migration of potassium into the carbon matrix

Masahiko Matsukata, T. Fujikawa, E. Kikuchi, Y. Morita

    研究成果: Article

    36 引用 (Scopus)

    抄録

    The interaction between potassium carbonate and carbon substrate in an inert atmosphere was investigated by using carbon black with an amorphous structure and graphite. Qualitative and quantitative changes of potassium species on carbon in the course of heat treatment were monitoried by means of a temperature-programmed reaction, extraction of potassium with a HCl solution, Auger electron spectroscopy, and electron probe microanalysis. Potassium carbonate impregnated on carbon black decomposed to give potassium oxide and CO2 in the temperature range 470-900 K. We found that potassium species migrated into the carbon matrix in the temperature range 670-900 K. At higher temperatures potassium oxide remaining on the surface was reduced by reaction with carbon. Although metallic potassium on graphite was lost due to evaporation, no pronounced loss of potassium was observed from carbon black containing less than 5 wt % of potassium. The migration of potassium into bulk carbon was not observed on graphite.

    元の言語English
    ページ(範囲)750-756
    ページ数7
    ジャーナルEnergy and Fuels
    2
    発行部数6
    出版物ステータスPublished - 1988 11

    Fingerprint

    Potash
    Potassium
    Carbon
    Soot
    Substrates
    Graphite
    Carbon black
    Temperature
    Electron probe microanalysis
    Auger electron spectroscopy
    potassium carbonate
    Oxides
    Evaporation
    Heat treatment

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Energy Engineering and Power Technology
    • Fuel Technology

    これを引用

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    abstract = "The interaction between potassium carbonate and carbon substrate in an inert atmosphere was investigated by using carbon black with an amorphous structure and graphite. Qualitative and quantitative changes of potassium species on carbon in the course of heat treatment were monitoried by means of a temperature-programmed reaction, extraction of potassium with a HCl solution, Auger electron spectroscopy, and electron probe microanalysis. Potassium carbonate impregnated on carbon black decomposed to give potassium oxide and CO2 in the temperature range 470-900 K. We found that potassium species migrated into the carbon matrix in the temperature range 670-900 K. At higher temperatures potassium oxide remaining on the surface was reduced by reaction with carbon. Although metallic potassium on graphite was lost due to evaporation, no pronounced loss of potassium was observed from carbon black containing less than 5 wt {\%} of potassium. The migration of potassium into bulk carbon was not observed on graphite.",
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    AU - Matsukata, Masahiko

    AU - Fujikawa, T.

    AU - Kikuchi, E.

    AU - Morita, Y.

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    N2 - The interaction between potassium carbonate and carbon substrate in an inert atmosphere was investigated by using carbon black with an amorphous structure and graphite. Qualitative and quantitative changes of potassium species on carbon in the course of heat treatment were monitoried by means of a temperature-programmed reaction, extraction of potassium with a HCl solution, Auger electron spectroscopy, and electron probe microanalysis. Potassium carbonate impregnated on carbon black decomposed to give potassium oxide and CO2 in the temperature range 470-900 K. We found that potassium species migrated into the carbon matrix in the temperature range 670-900 K. At higher temperatures potassium oxide remaining on the surface was reduced by reaction with carbon. Although metallic potassium on graphite was lost due to evaporation, no pronounced loss of potassium was observed from carbon black containing less than 5 wt % of potassium. The migration of potassium into bulk carbon was not observed on graphite.

    AB - The interaction between potassium carbonate and carbon substrate in an inert atmosphere was investigated by using carbon black with an amorphous structure and graphite. Qualitative and quantitative changes of potassium species on carbon in the course of heat treatment were monitoried by means of a temperature-programmed reaction, extraction of potassium with a HCl solution, Auger electron spectroscopy, and electron probe microanalysis. Potassium carbonate impregnated on carbon black decomposed to give potassium oxide and CO2 in the temperature range 470-900 K. We found that potassium species migrated into the carbon matrix in the temperature range 670-900 K. At higher temperatures potassium oxide remaining on the surface was reduced by reaction with carbon. Although metallic potassium on graphite was lost due to evaporation, no pronounced loss of potassium was observed from carbon black containing less than 5 wt % of potassium. The migration of potassium into bulk carbon was not observed on graphite.

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