[The catalytic wet air oxidation reaction of acetic acid with Ti-Ce series catalyst].

The influence factors and reaction mechanism during the catalytic wet air oxidation of acetic acid with Ti-Ce series catalyst was investigated in this paper. The results show that the reaction was influenced by the catalyst load, the reaction temperature, the pH of the reaction system and the partial pressure of oxygen. More than 90% removal efficiency of acetic acid (as COD) can be obtained at the reaction conditions as follow: temperature 230 degrees C, oxygen partial pressure 2-2.5 MPa, catalyst amount 5 g/L, initial pH of the system 3.0 and reaction time 1 h. With Ion Chromatography, the formic acid formed during the reaction process was detected. The formic was found during the wet air oxidation of acetic acid in the absence of catalyst, but can not be detected during the catalytic wet air oxidation process with Ti-Ce catalyst. It means that the presence of catalyst in the system not only improve the removal efficiency, but also change the oxidation pathway.