Kinetic study on peroxidation of benzaldehyde by polymer-immobilized cobalt-EDTA complex

Polymer-immobilized cobalt-EDTA complex was prepared by grafted copolymeriz ation of methacrylic acid (MAA) and acrylonitrile (AN initiated by redox in itiation of EDTA-2Na (Ethylenediamine tetraacetic acid disodium salt) with ceric ion (Ce2+)). High yield and selectivity for peroxidation of benzaldeh yde were obtained when using the polymer-immobilized cobalt-EDTA complex as a catalyst. With the concentration of benzaldehyde increasing, the concent ration of perbenzoic acid was increased from 0.38M to 0.98M, but yield of p erbenzoic acid decreased from 0.76M to 0.65M. With the amount of the polyme r support increased, the yield of perbenzoic acid increased from 70% to 82% . The selectivity remained about 82% in the various amounts of the polymer support. The activation energy of peroxidation of benzaldehyde was 43.4 KJ/ mole. The expression of the reaction rate was: r(i) = k [RCHO](o)(1.0) [pol ymer support](0.5). A mechanism for peroxidation of benzaldhyde catalysed b y polymer-immobilized cobalt-EDTA complex was proposed in this investigatio n. (C) 2001 John Wiley & Sons, Inc.