Study Of the Textural of Cobalt Oxide Catalyst (Co3O4)
Keywords:
Co-sedimentation, , acidity, cobalt oxide (Co3O4), adsorption, X-ray diffraction (XRD), infrared. (IR)Abstract
Six samples of cobalt oxide catalyst were prepared in this paper by thermal calcination method at pH = 9.5, then the samples were dried at 120ºC and the prepared samples were calcined at 400,500,600ºC.
The crystal phases formed in calcined samples at 500ºC were determined by XRD diffraction spectra, where the spectra showed the presence of the Co3O4 phase and the IR infrared spectra showed characteristic beams of the vibrational motions of the bond (Co -O). FTIR spectra for pyridine adsorbed on calcined samples at 500ºC showed the presence of Lewis and Brownstead acid centers.
The properties of the textural of all samples were determined by analyzing nitrogen adsorption data at 77ºK, where the specific surface area showed maximum ends at 500ºC for pure cobalt oxide samples and cobalt oxide samples containing 3 wt% and 5 wt% ammonium sulfate and at 400ºC for cobalt oxide samples containing 1 wt% ammonium sulfate, and calculations of the middle pore radius ra showed that the samples contained transition pores of the type (meso)
