Spatially resolved operando infrared analysis of a microstructured catalytic surface for CO oxidation over Pt based catalysts

A new experimental reactor concept was developed for operando and spatially resolved DRIFTS surface analysis over a microstructured catalytic reactor. Both gas and surface adspecies concentration profiles can be established along the channels coated with catalyst. The oxidation of carbon monoxide was studied from 25 to 300 degrees C over a Pt/CeO2-Al2O3 catalyst. For these operating c onditions nearly isothermal conditions were observed for the microstructured reactor, with a continuous increase in conversion along the microchannels. In contrast, an important thermal effect with characteristic light-off was obtained in the fixed bed reactor, underlining the unique behaviour of the microstructured system. Modelling of the CO conversion and surface adspecies concentration as a function of temperature along the channels was performed on the basis of a simple reaction mechanism. Kinetic parameters depending on the catalyst composition were obtained, in good agreement with literature data. To cite this article: C Daniel et al., C R. Chimie 12 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.