Reduced SrTiO3-Supported Pt-Cu Alloy Nanoparticles for Preferential Oxidation of CO in Excess Hydrogen
In this work, we employ Pt-Cu alloy nanoparticles supported on reduced-SrTiO3 (RSTO) to obtain a poisoning-resistant catalyst in the desired operative temperature range. The changing Cu concentration in the Pt-Cu bimetallic alloy elucidates the trend of changing efficiency, selectivity and stability of CO conversion over the bimetallic catalyst. Among the various compositions, we find that Pt40Cu60 is the most effective catalyst to target CO oxidation by competing with the the undesirable H2 oxidation. Here, we report interesting results on the trade-off between the selectivity of CO conversion as well as the maximum CO conversion (%) over the catalyst. The difference in CO adsorption over monometallic Pt and bimetallic Pt-Cu catalysts is well-reflected by the controlled adsorption-desorption studies.