PORE STRUCTURE OF UNIFORM SPHERICAL COBALT PHOSPHATE PARTICLES

The pore structure and properties of uniform spherical cobalt phosphat e particles have been investigated by various means. The chemical and thermogravimetrical analyses gave the formula of the particles as Co3( PO4)1.95(OH)0.15.4.4H2O. The X-ray diffractometer measurement revealed that the particles possess a thermally unstable layer structure. The particles pretreated below 45-degrees-C adsorbed H2O much more than N2 , CH3OH, C6H6, CO2, and CCl4, but this selective adsorption of H2O dis appeared on outgassing above 50-degrees-C. This result could be interp reted by a molecular sieve effect of slit-shaped micropores in the par ticles.