Abatement of volatile organic compounds: oxidation of ethanal over niobium oxide-supported palladium-based catalysts

• Published in: Catalysis today 2003-02, Vol.78 (1), p.419-432
• Main Authors: Brayner, Roberta, dos Santos Cunha, David, Bozon-Verduraz, François
• Format: Article
• Language: English
• Subjects: Catalysis; Catalytic reactions; Chemistry; CO 2; Ethanal; Exact sciences and technology; General and physical chemistry; IR spectroscopy of adsorbed CO; Nb 2O 5; Oxidation; Pd–Au; Pd–Cu; Photoreduction; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/S0920-5861(02)00321-8

Niobium-supported palladium-based catalysts (Pd, Pd–Cu and Pd–Au) were employed in the oxidation of ethanal. The catalysts were prepared according to original methods by either multi-steps (anchoring of complexes, calcination and reduction) or one-step (photoassisted reduction) procedures. The oxidation of ethanal was carried out in gas phase in a dynamic-differential reactor at 300 °C at atmospheric pressure. The activity/selectivity of the catalysts depend on (i) the catalyst preparation; (ii) the presence of a second metal. Addition of Au or Cu decreases the catalysts deactivation and the best performance in total oxidation was obtained with Pd–Au/Nb 2O 5 prepared by photoassisted reduction. As shown by in situ IR spectroscopy of adsorbed CO, this peculiarity may be ascribed to Au→Pd electron donation, which prevents the surface oxidation of palladium particles.