Study of the Most Important Physicochemical Properties of Cobalt Oxide (Co3O4) Prepared by Thermal Calcination Method
Keywords:
Adsorption, X-Ray Diffraction (XRD), Infrared Spectroscopy (IR), Co-sedimentation, acidity, Cobalt Oxide (Co3O4)Abstract
In this research, three samples of cobalt oxide were prepared, where the samples were prepared from cobalt nitrate as their source, and the samples were controlled at PH=9.5, then dried at 120 oC, and the samples prepared at temperatures were calcined at 400,500,600oC.
The crystal phases formed in calcined samples were determined at temperatures of 400,500,600 oC and showed the presence of the crystal phase Co3O4 in all the samples prepared in different proportions. IR spectra also showed distinct and clear beams of the vibrational motion of the bond (Co (III)-O), which is a clear indication of the formation of cobalt (III) oxide. FT-IR spectra of pyridine adsorbed on calcined samples at 500,600 oC showed the presence of Lewis and Brownstead acid centers.
The histological structure characteristics of all samples were determined by analyzing nitrogen adsorption data at 77 k, and the adsorption curves of calcined samples were type (IV) where they showed a loop of retardation indicating capillary condensation in the transition pores. The specific surface area showed a maximum end of the calcined sample at 500oC with a surface area of 4.837 (m2/g), and radius calculations showed that the samples contained transition pores (meso).
