CO PROX over Pt-Sn/Al2O3: a combined kinetic and in situ DRIFTS study

SSCI-VIDE+ING+AMS:YSC:FRMInternational audiencePEM fuel-cell technology requires virtually CO-free hydrogen feedstocks. Preferential oxidation (PROX) aims at removing small amounts of CO in H2-rich streams by catalytic oxidation of CO at low temperatures, with minimal production of water. Bimetallic Pt-Sn catalysts have shown much higher activities for PROX than those based solely on Pt but the actual state of the active phase under reaction conditions is still a matter of debate. To further explore this issue, a combined DRIFTS (Diffuse Reflectance Infrared Fourier Transformed Spectroscopy) and kinetic study under similar CO PROX reaction conditions was performed on alumina-supported Pt-Sn and Pt exhibiting both well-controlled particle sizes