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Structure Sensitivity and Kinetics of D-glucose Oxidation to D-gluconic Acid Over Carbon-supported Gold Catalysts by Y. Önal; S. Schimpf; P. Claus is a Materials Science article available to read on EtoBox.

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The heterogeneously catalyzed oxidation of D-glucose to D-gluconic acid over Au/C catalysts has been studied. A series of Au/C catalysts were prepared by the gold sol method with different reducing agents and different kinds of carbon support providing Au mean particle diameters in the range 3-6 nm. The activities of these catalysts with respect to D-glucose oxidation were compared, and several aspects influencing activity, especially Au particle size, were discussed. The influence of reaction conditions (T = 30-90 • C, pH 7.0-9.5) on the kinetics of the D-glucose oxidation has been examined using the most active Au/C catalyst. By a detailed analysis of all reaction products under different reaction conditions, a reaction network of the D-glucose oxidation is presented, and a reaction mechanism for D-glucose oxidation that explains the influence of pH on reaction rate is proposed. Ensuring that D-glucose oxidation takes place in the kinetic regime (sufficient stirring rate and airflow rate), a semiempirical model based on a Langmuir-Hinshelwood-type reaction pathway is assumed. At 50 • C and pH 9.5 kinetic parameters were calculated by an optimization routine. The resulting concent

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Author

Y. Önal; S. Schimpf; P. Claus

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9517)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)