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Resumo(s)
Carbon-supported platinum and iridium catalysts were prepared for catalytic wet air oxidation (CWAO) applications. These catalysts were tested in the CWAO of butyric acid aqueous solutions at 200 °C and 6.9 bar of oxygen partial pressure, and significant conversions above 70% were obtained depending on the catalyst used. The long-term deactivation resistance of the Pt/C
catalyst is higher than that of the Ir/C catalyst. The deactivation observed with the Ir/C catalyst was attributed to the overoxidation of the surface of iridium by molecular oxygen. A deactivation study of the catalysts was conducted using N2 adsorption, thermogravimetric analysis,
temperature-programmed reduction, and X-ray photoelectron spectroscopy. A kinetic model
describing the observed deactivation phenomena in the Ir/C catalyst is proposed and tested using the experimental data obtained in the CWAO of the systems studied.
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Gomes, Helder; Órfão, José; Figueiredo, José; Faria, Joaquim (2004). CWAO of butyric acid solutions: catalyst deactivation analysis. Industrial and Engineering Chemistry Research. ISSN 0888-5885. 43:5, p.1216-1221