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Advisor(s)
Abstract(s)
Carbon supported platinum (1% wt) catalysts were prepared by the incipient wetness impregnation method and by
organometallic chemical vapor deposition. Catalyst characterization was carried out by means of adsorption and thermogravimetric
techniques, and by electron microscopy. The catalyst with higher metal dispersion was produced by incipient wetness
impregnation. The catalysts were tested in the catalytic wet air oxidation (200 C and 6.9 bar of oxygen partial pressure) of aqueous
solutions containing low molecular weight (C2 to C4) carboxylic acids. Significant conversions (greater than 60% over 2 h) and
100% selectivity towards water and non-carboxylic acid products were observed for both systems. The initial reaction rate was used
to compare the performance of the two catalytic materials and direct correspondence to the metal dispersion was found. No metal
leaching was observed during reaction and no significant deactivation occurred in three successive catalytic oxidation runs. A
kinetic model based on the Langmuir–Hinshelwood formulation was applied and the results were analyzed in terms of a
heterogeneously catalyzed free radical mechanism.
Description
Keywords
Catalytic wet air oxidation (CWAO) Carbon supported platinum catalysts Incipient wetness impregnation Organometallic chemical vapor deposition (OMCVD)
Citation
Gomes, Helder; Serp, Philippe; Kalck, Philippe; Figueiredo, José; Faria, Joaquim (2005). Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids. Topics in Catalysis. ISSN 1022-5528. 33:1-4, p. 59-68
Publisher
Springer