Synthesis of MoO5, Na2MoO4.2H2O and (NH4)6Mo7O24.4 H2O nano catalysts based on multi-walled carbon nanotube

In this study, 3 different molybdenum oxide nano catalysts based on carbon nanotubes were synthesized with the precursors of MoO5, Na2MoO4.2H2O and (NH4)6Mo7O24.4H2O, using reflex and hydrothermal methods. The structure and morphology of these nano catalysts were studied by FTIR, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA) and X-ray diffraction (XRD) spectra. FTIR spectra show that MoO5 has the peaks more intense than both Na2MoO4.2H2O and (NH4)6Mo7O24.4H2O spectra peaks. XRD spectra also, show higher intensity for MoO5-MWNT peaks than intensities of the others one. SEM and TEM spectra show that in MoO5-MWNT catalyst, nano particles mostly were placed on the open end and interior of nanotubes. Whereas, the amounts of nano particles of molybdenum oxide, in Na2MoO4-MWNT and (NH4)6Mo7O24-MWNT catalysts, are low and are placed on the surface of nanotubes. TGA analysis show that the amount of MoO5-MWNT catalyst lies over nanotube, in respect of the two others, was more considerable (57/06 wt %). Thereafter, catalytic ability of these nano catalysts was examined by oxidation of 2-propanol (in presence of H2O2 as oxidant, n-dodecanone as interior standard and CH2Cl2 as solvent). Studying the results show that, the transformation of 2-propanol to product, by (NH4)6Mo7O24-MWNT catalyst is more than the two others

Author(s): A. Safarpour Malakroudi1, F. Ashrafi1 and H. Sedighian Rad2

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