No.14 炭酸カルシウムを触媒原料とする低炭化度炭の水蒸気ガス化(研究発表)

概要

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Steam gasification of a low rank coal with Ca catalysts prepared from CaCO_3 in water has been studied with a fixed-bed, quartz reactor. When the coal with about 0.6 wt % Ca is first pyrolyzed and then gasfied for 1 h in 50 vol. % H_2O/He, char conversions at 750 and 800 ℃ reach approximately 70 and 90 wt % (dacf), which are 2 and 1.5 times those without the Ca, respectively. The catalyst shows the high activity comparable to that of the Ca ion-exchanged using an aqueous solution of Ca(OH)_2. The TPD and XRD measurements reveal that CaCO_3 added is initially present in the ion-exchanged forms and then finely-dispersed in the pyrolyzed char. These results demonstrate that CaCO_3 is effective as catalyst raw material in steam gasification of low rank coal.
2011-10-27