Synthesis and Characterization of silica supported hetropolyacid H0.5Co1.25[PW11MnO40] and investigation of its catalytic activity in alcohols oxidation
Paper ID : 1292-ICNS
Authors:
farnoosh Ghaffarzadeh *
Department of chemistry, faculty of chemistry, Islamic Azad University Tehran North Branch, Tehran, Iran
Abstract:
In this research, H0.5Co1.25[PW11MnO40]/Silica was prepared with impregnation method, and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and energy dispersive spectroscopy (EDS) methods. The morphology of the samples was studied by field emission scanning electron microscope (FESEM) and surface area, pore volume and pore dimeter of the compounds were measured by BET method. Comparison of FTIR spectra of H3PW12O40 and H3PW11MnO40 showed the presence of Mn in the Keggin-type structure of H3PW11MnO40. XRD patterns of the prepared catalyst confirmed presence of the H3PW12O40 phase in the samples. The FESEM images indicated that the synthesized particles were in nanoscale. The energy dispersive spectroscopy (EDS) analysis of the sample reveals the existence of Si, O, Co, Mn and W elements and showed W/Mn and Co/Mn atomic ratios of 10.9 and 1.07, respectively. The catalytic activity of the prepared catalyst was investigated in oxidation of benzyl alcohol. The result indicated 86 % selectivity to benzaldehyde for the catalyst.
Keywords:
Heteropolyacids; Silica; Nanoscale; Alcohols oxidation
Status : Abstract Accepted (Poster Presentation)