Preparation and Physicochemical Properties of Metal Complexes Immobilized on Montmorillonite K10 (MMT K10)

Abstract

Series of heterogeneous catalyst were synthesized by the direct immobilization of various concentrations of MoO2(acac)2 and VO(acac)2 on montmorillonite (MMT) K10 clay. The immobilized catalysts were characterized by x-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), thermal gravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) with KBr pellet method. The basal spacing for Mo-MMT K10 and V-MMT K10 obtained from XRD analysis suggests that the clay structure were retained. AAS analysis revealed that as the concentration of the metal increased, the elemental compositions of Mo and V complexes on MMT-K10 samples were also increased. The bands that appear in the region of 1300-400 cm-1 from FTIR are attributed to the stretching vibration from SiO2 tetrahedra, indicating the structure of the clay. Besides from the thermal analysis, the higher concentration of metal complexes (Mo and V) immobilized on MMT-K10 structure make them being better hydrophobic nature thus lower the loss of physisorbed water molecules weakly bound to the material.

Keywords: Heterogeneous catalyst, Montmorillonite K10 Molybdenum complexes, Vanadium complexes