Synthesis of his-quaternary ammonium peroxotungstates (peroxomolybdates)and their catalytic activity in oxidation of alcohols by aqueous H2O2

摘要

Three kinds of bis-quaternary ammonium salts of peroxotungstate and peroxomolybdate,such as PhCH2NO(O2)2(C2O4)] and PhCH2N(CH2)6NCH2Ph [MoO(O2)2(C2Oa)],have been synthesized and characterized.Their catalytic activity in the oxidation of cyclohexanol and benzyl alcohol was investigated with only aqueous 30% hydrogen peroxide.The results show that the bis-quaternary ammonium peroxotungstates are excellent catalysts in the oxidation of benzyl alcohol and cyclohexanol under moderate conditions.However,the catalytic ability of bis-quaternary ammonium peroxomolybadates is relatively poor.The yields of benzyl acid,benzaldehyde,and cyclohexanone reached up to 93.0%,93.6%,and 91.7%,respectively.