高周波熱プラズマ法によるWC1-x超微粒子の合成とその特性

概要

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Ultrafine WC1-x powder has been prepared as a single phase by a newly designed radio-frequency thermal plasma apparatus and its thermal stability and catalytic activity were examined. WO3 was found to be appropriate as a starting material and the mole ratio of CH4/WO3 was also found to be better with over than 15 in order to obtain WC1-x in the range of 90-95 wt%. Specific surface area of the WC1-x powder was measured to be 34m2/g, of which particle diameter was calculated to be 10 nm. Particle diameter of WC1-x was observed to be 5-20 nm by TEM and it was dispersed relatively well. It was stable thermally below 1, 000°C under Ar atmosphere but it began to decompose to W2C over 1, 000°C and seemed to change to W at 1, 300°C. On the catalytic activity of WC1-x it became clear that the ultrafine WC1-xpowder promoted the formation of n-butane in the hydrogenation reaction of cis-2-butene.
社団法人粉体粉末冶金協会の論文