金属塩触媒による炭化水素の液相酸化(第1報)

P-キシレンの液相酸化における金属ナフテン酸触媒の異常濃度効果

抄録

There are practically no detailed investigations on the relation between the concentration of metal naphthenates and their activities for liquid phase oxidation of p-xylene. The author has been investigated on this reaction by use of manganese, nickel, copper, chromium, and cobalt naphthenate catalysts. The results indicated that manganese, nickel, and copper naphthenate catalysts showed considerable difference in activity by the difference in concentration of catalyst. In case of using the same catalyst, the formation of p-toluic acid is increased with an increase in the concentration of catalyst to a certain extent, but the formation of p-toluic acid is rapidly decreased above a certain concentration of the catalyst and finally there is no formation of p-toluic acid. This kind of conversion of catalyst activity from positive to negative value with an increase of catalyst concentration has been recognized in case of copper catalyst as an exception, but such phenomenon has not been considered to happen in other metal-sailt catalysts. Cobalt and chromium naphthenates catalysts showed no such unusual effect of high concentration of catalyst.