Characterizations of Platinum Catalysts Supported on Ce, Zr, Pr-oxides and Formation of Carbonate Species in Catalytic Wet Air Oxidation of Acetic Acid

0311981 - ÚCHP 2009 RIV NL eng J - Journal Article
Gaálová, Jana - Rossignol, S. - Barbier Jr., J. - Duprez, D. - Kappenstein, C.
Characterizations of Platinum Catalysts Supported on Ce, Zr, Pr-oxides and Formation of Carbonate Species in Catalytic Wet Air Oxidation of Acetic Acid.
[Charakterizace platinových katalyzátorů na nosičích Ce-Zr-Pr-O a vznik uhličitanových sloučenin ve vlhké oxidaci vzduchem kyseliny octové.]
Catalysis Today. Roč. 124, 3-4 (2007), s. 185-190. ISSN 0920-5861. E-ISSN 1873-4308
Institutional research plan: CEZ:AV0Z40720504
Keywords : acetic acid * cerium oxide * catalytic wet air oxidation
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.764, year: 2007

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.

Množství uhličitanových sloučenin ve vlhké oxidaci vzduchem kyseliny octové na platinových katalyzátorech typu Pt/ Ce-Zr-Pr-O vzrůstá se schopností katalyzátoru přenášet kyslík. Tyto sloučeniny inhibují katalytickou reakci.
Permanent Link: http://hdl.handle.net/11104/0163167