Catalytically active gold clusters and nanoparticles for CO oxidation |
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Authors: | AN Pestryakov N Bogdanchikova I Tuzovskaya F Jentoft A Díaz |
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Institution: | a Tomsk Polytechnic University, Lenin Avenue 30, Tomsk 634050, Russia b Centro de Ciencias de la Materia Condensada, Universidad Nacional Autonoma de México, Ensenada 22800, Mexico c Fritz Haber Institute, Berlin 14195, Germany |
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Abstract: | Electronic states of gold nanoparticles in mordenite and their transformations under redox treatments have been studied by the methods of FTIR spectroscopy of adsorbed CO and diffuse reflectance UV-visible spectroscopy. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite - Au+ and Au3+ ions, charged clusters , and neutral nanoparticles Aum. Catalytic tests of the samples revealed the existence of two types of active sites of gold in CO oxidation - gold clusters <2 nm (low-temperature activity) and gold nanoparticles (high temperature activity). |
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Keywords: | Gold catalysts Nanoparticles Zeolites FTIR UV-visible spectroscopy |
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