Journal
CATALYSIS TODAY
Volume 124, Issue 3-4, Pages 185-190Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2007.03.036
Keywords
acetic acid; cerium oxide; catalytic wet air oxidation; platinum; praseodymium; zirconium; oxygen storage capacity
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Catalytic wet air oxidation (CWAO) of aqueous solution of acetic acid (78 mmol L-1) was carried out with pure oxygen (2 MPa) at 200 degrees C in a stirred batch reactor on platinum supported oxide catalysts (Pt/oxide, oxide = CeO2, Zr0.1Ce0.9O2, Zr-0.1(Ce0.75Pr0.25)(0.9)O-2 and ZrO2). Platinum was loaded on oxides by impregnation (5 wt%), and then the catalysts were reduced under H-2. Homogenous dispersions of 2-3 nm metal crystallites were obtained. The catalytic activity depended on the ability of the support to resist to the formation of carbonates. Ce(CO3)OH species, determined by FT-IR and XRD, were rapidly formed during the CWAO reaction especially on mixed oxides. These carbonates were responsible to a drastic drop in catalytic performances. Amounts of carbonate species increase with the ability of the catalyst to transfer oxygen. (C) 2007 Elsevier B.V. All rights reserved.
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