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The working mechanism of a ceria-supported Cu (Cu at :Ce at =1:10) system in the Catalytic Wet Oxidation (CWO) of phenol with O 2 (T R , 130-170°C; P O2 , 7 atm) has been thoroughly assessed. Basic relationships amongst pH, extent of leaching and rate of phenol and TOC conversion prove the major contribution of a homogeneous catalytic path by Cu ions on the peculiar CWO pattern of supported copper catalyst. In addition, gas-phase reduction/oxidation tests signal the lack of reversibility of the redox cycle of the CuCeO x system under typical reaction conditions.

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