Methane formation and water-gas shift reactions over potassium carbonate loaded on coal char at elevated pressure in H2-CO-H2O system.

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  • KIMURA SHOICHI
    Department of Chemical Engineering, Faculty of Engineering Science, Osaka University
  • TONE SETSUJI
    Department of Chemical Engineering, Faculty of Engineering Science, Osaka University
  • OTAKE TSUTAO
    Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

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The rate of methane formation over potassium carbonate catalyst loaded on coal char was measured at elevated pressure in the range 1.5-2.0 MPa in the H2-CO-H2O system. The rate of simultaneous progress of the water-gas shift reaction was also measured. The effect of gaseous components on these reactions was investigated to obtain the respective rate equations.<br> The existence of H2O in the reactant gas decreased the rate of methane formation through CO hydrogenation and enhanced that through carbon hydrogenation. In the H2-CO-H2O system, the rate of carbon hydrogenation is comparable to that of the CO hydrogenation as reaction temperature becomes high and suitable for steam gasification.<br> The fixed-bed gasification was carried out at 2 MPa and 1023 K, and the exit gas compositions were simulated on the basis of these kinetic data. The calculated results agreed fairly well with the experimental ones.

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