Abstract
The catalytic activities of the complexes, Cp′M(CO) 3X (Cp′ = Cp (η 5-C 5H 5), Cp* (η 5-C 5Me 5); M = Mo, W; X = Cl, CH 3) and Mo(CO) 6 have been examined for the oxidation of phenol (37.6 g/L) using H 2O 2 as oxidant in aqueous solution. Among them, CpMo(CO) 3Cl and CpMo(CO) 3(CH 3) showed the highest catalytic activity. Conversion of phenol at 55 °C is more than 80% after 24 h when water is used as solvent and the ratio of catalyst:phenol:H 2O 2 is 1:50:200. The main oxidation products observed in solution are oxalic acid and catechol, together with trace amount of p-benzoquinone and maleic acid. Under similar conditions, binary Mo(CO) 6 catalyses phenol oxidation giving hydroquinone and p-benzoquinone as main products.
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