Transformation of alumina-supported Pt-Au alloyed nanoparticles into core-shell Pt@Au structures during high-temperature treatment
Source abstract
Abstract
A series of alumina-supported bimetallic AuPt catalysts was prepared by decomposition of a double complex salt containing simultaneously gold and platinum. The decomposition was performed in both the reductive and oxidative atmospheres. Monometallic Au/γ-Al2O3 and Pt/γ-Al2O3 catalysts were used as reference samples. Physicochemical characterization of the catalysts has revealed that despite the preparation route and total metal loading, the alloyed nanoparticles are being formed with close values of the average particle size and similar particle size distribution, while the composition and the structure of the particles differ significantly. Thermal aging of the catalysts at 600 and 800 °C leads to redistribution of metals in the alloyed particles and formation of core-shell Pt@Au nanostructures, which results in significant deactivation of the catalysts concerning a model reaction of CO oxidation. The formation of core-shell particles in the case of high-loaded samples was found to prevent the agglomeration process at elevated temperatures.
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Research context
OpenAlex topics: Catalytic Processes in Materials Science · Electrocatalysts for Energy Conversion · nanoparticles nucleation surface interactions
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