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The wet air oxidation of phenol aqueous solutions (5g/L) has been studied in a trickle bed reactor (140°C and 7atm of oxygen pressure). The experiments were performed over several 1%Ru/5%CeO 2 –Al 2 O 3 samples, prepared by different methods: impregnation, co-impregnation, co-precipitation and surfactant. Phenol conversion and chemical oxygen demand were evaluated. Results...