par Barroo, Cédric 
;De Decker, Yannick ;Jacobs, Luc ;Visart de Bocarmé, Thierry
Référence Applied surface science, 412, page (564-570)
Publication Publié, 2017
;De Decker, Yannick ;Jacobs, Luc ;Visart de Bocarmé, Thierry Référence Applied surface science, 412, page (564-570)
Publication Publié, 2017
Article révisé par les pairs
| Résumé : | Automotive pollution control crucially relies on the reactivity of metal alloy catalysts. Understanding how the chemistry of an alloy compares with that of pure metals forms a decisive step towards the rational development of applied formulations of such catalysts. In this context, we studied the hydrogenation of NO2 on Pt-Rh catalysts at the nanoscale with field emission microscopy (FEM). Previous studies have shown the presence of complex reaction kinetics at the surface of Pt for this reaction, including periodic oscillations at 390 K. As we briefly show here, similar kinetics can also be observed on Rh at higher temperatures. The alloy samples (Pt-17.4 at.%Rh) show signs of important reactivity and associated nonlinear dynamics in an intermediate temperature range. In particular, at 425 K isothermal oscillations are observed on this specific alloy catalyst. The role of the alloy composition on the window of reactivity is explained with a simple theoretical model for the kinetics of the reaction. |
