Aqueous Ozone Decomposition Onto a Co₂O₃-Alumina Supported Catalyst

Abstract

The aqueous ozone decomposition in the presence of a Co₂O₃-Alumina catalyst was investigated. Activity and estability assays were conducted by reusing the same catalyst in consecutive runs. The catalyst was shown to significantly increase the ozone abatement rate without loss in activity after five consecutive experiments. The process can be acceptably simulated by a double homogeneous–heterogeneous decomposition mechanism. An increase in the working temperature resulted in an opposite effect by increasing the extension of the homogeneous decomposition and lowering the extension of the heterogeneous decomposition. Similarly, different trends were observed by adding two distinct free radical scavengers (terc-butyl alcohol and carbonates).

Keywords:

• Ozone
• Heterogeneous catalysts
• Kinetics
• Cobalt oxide

Acknowledgments

Authors thank the CICYT of Spain and European FEDER Funds for the economic support through project PPQ2000/0412.