Effect of the minerals of coals on the gasification of carbonaceous materials.

概要

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The purpose of this work is to examine if the metals involved in coals catalyze the gasification of carbonaceous materials. Minerals were isolated from three kinds of coal by seven different methods, and were supported on a pure carbon (carbon black). Samples thus prepared were gasified in an atmospheric pressure of steam at 818°C. The mineral extracted with HNO3 or HCl was very effective to accelerate the CO2 formation reaction as well as the gasification reaction. On the other hand, the mineral isolated by an oil agglomeration method, the residue after the completion of the gasificationa, nd the so-called ash were not effective at all, but they showed a little activity when they were supported on the carbon after the treatment with HNO3. The rate of CO formation was practically constant for all the samples. This means that the active metals in coals catalyze only the CO2 formation reaction. Of the metals in the minerals, Na, K and Ca which are bound to carbon were supposed to catalyze the gasification reaction from the measurements of the amounts of metals involved and the X-ray diffraction patterns of the isolated minerals. The amount of oxygen trapped by the chars were also measured by use of a Curie-point pyrolyzer, and the gasification rate was found to be intimately related to the amount of oxygen trapped by the minerals on the chars.
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