Low-temperature iron-modified cobalt oxide system Part I. Preparation and characterisation

The cobalt oxide system, modified with Fe was prepared by a solution technique at a room temperature. The periodic method of precipitation with inverse order of feeding the precipitator to the system (Me2+ --> OH- + OCl-) is used, which favors the formation of amorphous and highly disperse oxide system with non-stationary surface properties. The fresh sample as well as the samples obtained by its thermal treatment at different temperatures were characterized by Mossbauer and Infrared spectral analysis. X-ray diffraction and chemical analyses. A comparative consideration of the composition and structure of individual and modified with Fe cobalt oxide system has been carried out in order to clarify the influence of Fe as a modifying additive on the activity and selectivity of the sample. The results obtained show that the inclusion of Fe leads to the appearance of new active sites in the fresh samples - Fe(III) ions in octahedral coordination and to increasing the mobility of the reactive oxygen. The synthesized oxide system shows suitable properties for catalytic oxidation of toxic organic and inorganic compounds in an aqueous medium. (C) 2001 Elsevier Science B.V. All rights reserved.