Selective oxidation of CO over model gold-based catalysts in the presence of H₂

Cécile Rossignol (1) , Sandrine Arrii (1) , Franck Morfin (1) , Laurent Piccolo (1) , Valérie Caps (1) , Jean-Luc Rousset (1)

1 IRC - Institut de recherches sur la catalyse

The model catalysts Au/Al₂O₃, Au/ZrO₂, and Au/TiO₂ were produced by laser vaporization of a metallic gold rod followed by deposition of the formed clusters onto the support powders. This technique allows to obtain a narrow size distribution of highly dispersed gold particles on the support and, most importantly, similar sizes whatever the support. This makes it possible to accurately study of the influence of the support identity on the catalytic reaction. A detailed investigation of the preferential oxidation of CO in the presence of H₂ was undertaken. Catalytic performances in the PROX reaction were compared with those in the oxidation of CO in the temperature range of 25–420 °C. A boost in the conversion of CO was observed in the presence of H₂ at low temperature; the extent of this boost is dependent on the support identity. Hence the reactivity order found for CO oxidation (Au/Al₂O₃ <

Mots clés: Gold catalysis; Model catalyst; Laser vaporization; CO oxidation; PROX

Domaines: Matériaux

Cécile Rossignol, Sandrine Arrii, Franck Morfin, Laurent Piccolo, Valérie Caps, et al.. Selective oxidation of CO over model gold-based catalysts in the presence of H₂. Journal of Catalysis, 2005, 230 (2), pp. 476-483. ⟨10.1016/j.jcat.2005.01.011⟩. ⟨hal-00417533⟩