CATALYTIC ACTIVITY OF DAWSON-MOLYBDOVANAD OPHOSPHORIC IN PHENOL HYDROXYLATION WITH HYDROGEN-PEROXIDE

Molybdovanadaphosphoric compounds with Dawson structure were synthesiz ed and used to hydroxylate phenol with hydrogen peroxide. The vibratio nal spectroscopy and P-31 NMR were used to characterize their structur es, The experimental results indicated that the heteropoly compounds w ith Dawson structure were excellent catalysts for the hydroxylation of phenol. A higher selectivity of single isomer can be obtained at the higher molar ratio of phenol to hydrogen peroxide.