Abstract
Selective photo-oxidation of liquid benzene was studied using cation-exchanged zeolites dispersed in C 6H 6/CH 3CN/H 2O mixture at room temperature by using molecular oxygen. Screening with BEA zeolites exchanged with 11 kinds of transition metal cations was performed. Pd 2+-, Fe 3+- and Cu 2+-BEA were shown to be effective for the formation of phenols (hydroquinone, resorcinol, catechol and phenol). The dihydroxybenzenes were mainly produced on Pd 2+-, Fe 3+- and Cu 2+-BEA, while phenol and CO 2 were the main products on TiO 2 semiconductor (Degussa P25). The photocatalytic property was greatly changed by immobilization of Pd 2+ on BEA; Pd 2+-BEA showed higher activity and selectivity for the formation of phenols than [Pd(NH 3) 4]Cl 2 in homogeneous solution, on which unselective photo-oxidation of benzene to CO 2 was the main reaction. The turnover number of Pd 2+-BEA for the formation of phenols was 35 (based on Pd) in 24 h, indicating that the reaction proceeded catalytically.
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