Bimetallic Au–Pt Nanocomposites in the CO Oxidation Reaction: New Synthetic Approach and Evolution in the Course of Catalysis
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A combination of two green chemistry methods—fluid (supercritical carbon dioxide) and metal vapor synthesis—has afforded γ-Al2O3-based systems modified with Au, Pt, Au–Pt, and Pt–Au nanoparticles. It has been shown that bimetallic nanocomposites in the CO oxidation reaction are more efficient catalysts than monometallic systems. The composition of the Au–Pt/Al2O3 intermetallic compound and its evolution in the course of catalysis have been studied by X-ray photoelectron spectroscopy. It has been demonstrated that the increase in system activity during catalysis is accompanied by a significant rearrangement of the structure and composition of the nanocomposite surface.
This work was supported by the Presidium of the Russian Academy of Sciences (program “Nanostructures: Physics, Chemistry, Biology, Technology Foundations”). Catalytic studies were carried out in the framework of State assignment for basic research at the Nesmeyanov Institute of Organoelement Compounds, RAS. Elemental analysis was performed using equipment of the Center of Investigations of Molecular Structure at the same institute.
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