Preparation of PGMA/SiO_2-bound metalloporphyrin biomimetic catalyst

In this paper,poly(glyceryl methacrylate)(PGMA) is bounded to silica by adopting the"Grafting from" method.The hydroxylphenyl porphyrin is bound to the surface of PGMA/SiO2 via the epoxy bond reacting to the hydroxyl and formed HPP-PGMA/SiO2,Further,the coordination between HPP-PGMA/SiO2 and MnCl2 is performed,and PGMA/SiO2 bound manganese porphyrin is gained(denoted as MnP-PGMA/SiO2).These compounds are characterized by FTIR spectra and atom absorbing spectra.Two factors are examined about the bonding process.The catalyst MnP-PGMA/SiO2 is used in the catalytic oxidation of ethylbenzene using dioxygen as oxygen source at ordinary pressure,and the transform of ethylbenzene into acetophenone is realized.The experimental results show that(hydroxylphenyl) porphyrin and its manganese complex can be favorably bound to the surface of PGMA/SiO2 via opening ring and forming ether.Under the optimal condition,which use 4.5mL triethylamine as catalyst under 70℃ lasting 8h,the most amount of bounding is 69.36μmol/g.Manganese ion is chelated with HPP-PGMA/SiO2 under 64℃ lasting 8h.The impact of the chelating reaction is identical with the other method,and the disposal of reaction is very simple.The solid catalyst MnP-PGMA/SiO2 can effectively catalyze the transform of ethylbenzene into acetophenone by dioxygen and exhibits fine catalysis activity.