Synthesis, Characterization and Catalytic Activity of Manganese(II)-Cobalt(II) Complexes Anchored SBA-16 for Liquid Phase Oxidation of p-Xylene

摘要

In this study, the results of synthesis and modified mesoporous surface of SBA-16 by using Schiff-base complexes [Co(II)-Mn(II)-Sal-APTES] were presented. Manganese(II) and cobalt(II)-Schiff bases complexes were synthesized by reaction between salicylaldehyde (Sal) and 3-aminopropyl triethoxy silane (APTES) in ethanol solution to form Schiff-base ligands. The Co(U)-Mn(II)-Sal-APTES-SBA-16 catalysts were analyzed by a series of analytical methods such as UV-Vis-DRS,XRD, N2 sorption isotherm, FT-IR, TGA-DTA, XPS and TEM. The results showed that the synthesized catalyst remains the pore size of SBA-16 after the covalent anchoring of Co(II)-Mn(II)-Sal-APTES complex over SBA-16 support. This catalyst was examined in the liquid phase oxidation of p-xylene using H2O2 as an oxidant. The catalytic activity was examined by the liquid-phase oxidation of p-xylene using H2O2 as an oxidant. It was found that catalyst show higher catalytic activity for the liquid phase oxidation of p-xylene. The combination of cobalt(II) and manganese(II) complexes to afford Co(Tl)-Mn(II)-APTES-SBA-16 catalyst enhances the response performance and product selectivity significantly oriented to terephthalic acid product.