Abstract
Investigations of various CeO 2 catalysts using XRD, O 2-TPD, H 2-TPR and catalytic wet air oxidation of phenol showed that CeO 2 calcined under higher thermal impact (designated as type A) displayed excellent catalytic ability for the redox reaction of organics. Results of the investigations mentioned above showed that type A CeO 2 has a less stable structure, more structure oxygen exchangeable and more oxidizing ability for the consumption of H 2 and conversion of phenol. At phenol concentrations between 400 and 2500 mg/L, oxygen pressure in the range of 0.5–1.0 MPa, and temperatures above 160°C phenol conversion stood at ⩾90% after 4 h. Total organic carbon removal increased with the reaction temperature. Under the reaction conditions, CO 2 selectivity was about 80% or more after 4 h reaction. The reduced catalytic ability of regenerated CeO 2 was caused either by stabilization of CeO 2 during the process of regeneration or by the deposition of some reaction residues.
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