Catalysts for Wet Air Oxidation Based on Ce-Zr-Pr-O Mixed Oxides Prepared by Soft Chemistry

Abstract:

Sol-gel Zr0.1Ce0.9O2 and Zr0.1(Ce0.75Pr0.25)O2 mixed oxides and coprecipitated pure ceria CeO2 displaying the fluorine type structure have been used as platinum or ruthenium catalysts’ supports for catalytic wet air oxidation (CWAO) of aqueous solution of acetic acid (78 mmol.L-1). These catalysts were prepared by conventional impregnation (5 wt-%) from platinum and ruthenium precursor salts or by exchange (~2 wt-%) in the case of ruthenium. A screening of catalysts in CWAO at 200°C under 2 MPa was performed and reveals that the best platinum catalyst is supported on pure ceria displaying large surface. For ruthenium catalysts, the highest conversion after 3 hours of reaction has been reached by the Ru/Zr-Ce-O system.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 2089-2095
• DOI: https://doi.org/10.4028/www.scientific.net/AST.45.2089
• Online since: October 2006
• Authors: Jana Mikulová, Sylvie Rossignol, Jacques Barbier Jr., Charles Kappenstein, Daniel Duprez
• Keywords: Catalytic Wet Air Oxidation, Cerium, Platinum, Praseodymium, Sol-Gel (SG), Zirconium

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