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Kinetics of Nitrate Hydrogenation in Water on Alumina and Niobia Supported Palladium-Copper Catalysts

  • Joyce Barbosa Salazar , Luciana Souza Ferreira , Fernando Cunha Peixoto , Monica Pinto Maia and Fabio B. Passos
Published/Copyright: July 3, 2012

Abstract

The kinetics of nitrate hydrogenation in water over niobia- and alumina-supported Pd-Cu catalysts were examined. A Langmuir-Hinshelwood kinetic model fitted concentration data, providing consistent kinetic and thermodynamic parameters. The kinetic model assumed a bimolecular surface reaction as the rate-determining step, with two types of sites. Pd-Cu/gamma-Al2O3 was active and selective under the reaction conditions. However, Pd-Cu/Nb2O5 deactivated during time on stream, and a deactivation function was added to the kinetic model to best fit the experimental data.

Published Online: 2012-7-3

©2012 Walter de Gruyter GmbH & Co. KG, Berlin/Boston

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