Abstract
Immobilization of the phenol((triethoxysilyl)propylimino) ligand (LH) on SBA15 and MCM41 afforded the ligands LH-SBA15 and LH-MCM41 respectively. The reactions of LH-SBA15 and LH-MCM41 with NiCl2, CoCl2 and FeCl2 salts produced the respective materials [Ni(LH-SBA15)2Cl2], (Ni-SBA15), [Co(LHSBA15)2Cl2], (Co-SBA15), [Fe(LH-SBA15)2Cl2], (Fe-SBA15) and [Ni(LH-MCM41)2Cl2], (Ni-MCM41) in good yields. The functional group determination, morphology, physical and surfaced properties of the materials containing immobilized ligands and complexes were established from FT-IR, TGA, TEM, SEM-EDX, PXRD, ICP-AES, and nitrogen physisorption measurement techniques. Activation of the complexes on the surface with EtAlCl2 as co-catalyst formed active catalysts for the oligomerization of ethylene affording mainly C6 oligomers. The SBA-15 immobilized catalysts were more active than the corresponding MCM-41 materials, while Ni(II) catalysts performed better than the corresponding Co(II) and Fe(II) systems. The immobilized catalysts could be used in three cycles without significant loss of catalytic activity and selectivity.
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