过渡金属盐及络合物在乙苯液相氧化中的催化作用

The Catalytic Behavior of Various Transition Metal Salts and Complexes in Liquid Phase Oxidation of Ethylbenzene

在常压氧、１１０℃的反应条件下，考察了不同过渡金属盐及乙酰丙酮络合物在乙苯液相氧化中的催化作用，其中钴的苯甲酸盐和乙酰丙酮络合物的活性较高，Ｃｏ（ａｃａｃ）３的催化活性高于Ｃｏ（ａｃａｃ）２。Ｃｏ（ａｃａｃ）２在乙苯的液相催化氧化反应中的诱导期比Ｃｏ（ａｃａｃ）３长，因此推测Ｃｏ（Ⅲ）可能是反应过程中的活性物种。反应速度随Ｃｏ（ａｃａｃ）３用量的增大而加快，表明反应可能是通过配位－链锁机理进行的。

The catalytic behavior of various transition metal salts and acetylacetonate in liquid phase oxidation of ethylbenzene has been investigated at 110 ℃ under atmospheric pressure of oxygen The catalytic activity of Co(acac) 3 is higher than that of Co(acac) 2 The induction period of Co(acac) 2 is longer than that of Co(acac) 3 Therefore,the active species may be Co(Ⅲ) The increasing amount of Co(acac) 3 enhances the reaction rate,indicating that the mechanism proceeds with a radical chain process