高周波熱プラズマ法による化学機能性炭化物超微粒子の合成に関する研究

概要

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Ultrafine carbide powders of Fe-Si-C and WC1-x were prepared utilizing a new radiofrequency thermal plasma system and their chemical properties were examined. Ultrafine Fe-Si-C powders were prepared in the plasma from the reactant gases of SiH4-CH4-Fe(CO)5. Phases of powders were classified to two groups; one is composed of β-FeSi2, which was very active for the selective formation of olefin in the Fischer-Tropsch reaction, the other is of α-Fe, Fe3Si and Fe5Si3, which gave high CO conversion. Ultrafine WC1-x powder in the phase of 90-95 wt% with the particle diameter of 5-20nm was obtained from the reactant gases in the mole ratio of CH4/WO3 with over than 15. It was stable thermally below 1, 000°C under Ar atmosphere but it began to decompose to W2C over 1, 000°C. Ultrafine WC1-x powder promoted catalytically the formation of n-butane in the hydrogenation of cis-2-butene.
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