Catalytic wet air oxidation of oleic acid on ceria-supported platinum catalyst.effect of pH |
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| Authors: | Beno?t Levasseur Benoist Renard Jacques Barbier Jr and Daniel Duprez |
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| Institution: | (1) Laboratoire de Catalyse en Chimie Organique, LACCO UMR 6503, CNRS and Université de Poitiers, 40 avenue du Recteur Pineau, 82022 Poitiers Cedex France;(2) Laboratoire de Catalyse en Chimie Organique, LACCO UMR 6503, CNRS and Université de Poitiers, 40 avenue du Recteur Pineau, 82022 Poitiers Cedex France;(3) Laboratoire de Catalyse en Chimie Organique, LACCO UMR 6503, CNRS and Université de Poitiers, 40 avenue du Recteur Pineau, 82022 Poitiers Cedex France;(4) Laboratoire de Catalyse en Chimie Organique, LACCO UMR 6503, CNRS and Université de Poitiers, 40 avenue du Recteur Pineau, 82022 Poitiers Cedex France |
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| Abstract: | Summary Catalytic wet air oxidation (CWAO) of oleic acid was carried out in a batch reactor on platinum supported ceria catalyst (Pt/CeO2). Oleic acid is a water insoluble linear unsaturated fatty acid of 18 carbon atoms. To increase the homogeneity of the solution
by saponification, the influence of NaOH additions in oleic acid CWAO mechanism and catalyst performances have been investigated.
The oxidation of such molecule occurs by two types of mechanisms: successive carboxy-decarboxylation which leads essentially
to CO2and/or C-C bonds splitting in the alkyl chain inducing a high formation of acetic acid. With or without NaOH, the 5%Pt/CeO2catalyst is active in the conversion of oleic acid and selective to carbon dioxide. In alkaline medium, oleic acid is initially
saponified which increases the solubility of the reactant before it to be oxidized. Finally the oxidation is slightly delayed
by the presence of NaOH. The catalyst characterizations show no significant difference before and after reaction.</o:p> |
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| Keywords: | oleic acid Catalytic wet air oxidation (CWAO) Pt/CeO2 catalysts saponification catalytic water treatment |
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