Study on kinetic of oxidation reaction red phenol on Fe-SBA-15 catalyst

Abstract

Large-pore hexagonal 5BA-15 molecular sieves partially substituted with iron (III) have been symthesized in acidic media. The degree of iron (III) incorporation into SBA-15 can be controlleed by a simple adjustment of the concentration of acidic solution. All sumples have been characterized by XRD and N, adsorption. The characterization of Fe-SBA-15 suggests that the iron atoms are highly dispersed and the obtained Fe-SBA-15 possesses highly ordered hexagonal structures. The obtained Fe-SBA-15 showed a excellent catalytic oxidation over phenol red. In the range of low temperature from 30 to 90oC, the rate data for the oxidation of phenol red reaction in excess H2O2 over Fe-SBA-15 catalyst can be fitted well to first order law. A Eley-Redeal type mechanism model were used to fit the proposed sites of [Fe*-H2O2]/SBA-15 and total oxidation of phenol red with the obsevered rate data. The model fitted to the experimetal data generated in this study indicates that nature of heterogeneous catalystic sites being diffirent from those of homogeneous ones cause its high catalytic perommance.