چكيده فارسي :
Graphene oxide and its derivative have attracted extensive interests in many fields, including catalytic chemistry, organic synthesis, and electrochemistry, recently. Transition metal complexes are one of the most useful and powerful catalysts for industrial processes. However, the practical applications of homogeneous metal complexes are hampered by their high costs with problems of separating from the reaction mixtures. Therefore, designing heterogenized metal complex catalysts is of great interest for economic and environmental reasons in recent years [1-5]. Catalytic epoxidation [6] of styrene is an important practical reaction for producing styrene oxide which is an important industrial organic intermediate and is used in the synthesis of fine chemicals and pharmaceuticals [7].A Mn (salen) complex has been homogeneously immobilized on a modified graphene oxide (GrO) support via covalent bonding. The loading of Mn (salen) complex on GrO nanosheets was monitored by FTIR, TG-DTA, and elemental analyses. The catalytic properties of Mn (salen) - Graphene oxide compound in the oxidation of styrene with H2O2 as oxidant were investigated and compared with the properties of their homogeneous analogues. It was found that both heterogeneous Mn (salen) catalysts were more active than their homogeneous analogues and that the product selectivity varied in cases of different oxidants. The supported Mn (salen) complex showed high yield of styrene oxide (86.0%) and good recoverability when using air as oxidant.
