Abstract
The catalytic oxidation of styrene using cis-MoO 2(L)(solv) [L=Salicylidene Salicyloyl Hydrazine) and its zeolite-Y composite as catalysts in the presence of molecular oxygen and in the temperature range 50–70°C is studied. The oxidation products are found to be styrene epoxide and phenyl acetaldehyde. Phenyl acetaldehyde is observed to form only in homogeneous catalytic system towards the end of a 5-h reaction period. A 77% conversion of styrene into products (styrene epoxide: phenyl acetaldehyde ratio=85:15) is obtained under homogeneous catalytic conditions, whereas use of complex zeolite composite resulted in 68% conversion of styrene into styrene epoxide selectively. Styrene epoxide is formed with a turnover of 9/mol Mo in catalyst at 60°C in homogeneous catalytic system. The turnover increased to 64 when encapsulated complex is used. The rate of styrene oxidation showed first-order dependence with respect to catalyst and substrate concentration. A mechanism for oxidation of styrene with cis-MoO 2(L)(solv) is proposed and reasons for selective conversion of styrene into corresponding epoxide is presented.
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