Spatially resolved operando infrared analysis of a microstructured catalytic surface for CO oxidation over Pt based catalysts
Résumé
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 °C over a Pt/CeO2–Al2O3 catalyst. For these operating conditions 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.
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