SAXS Application for the Determination of the Gold Nanoparticle Sizes in Au/C Catalysts: Advantages over Other Methods

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Resumo

In the case of Au/C catalysts have been shown advantages of application SAXS with masking liquid technique for determining supported metal particle sizes compared with TEM and XRD as standard methods. According to SAXS data particle size distributions of gold in a wide range (1–50 nm) were obtained with full consideration of all size fractions of particles present in the samples under study. Also values of the mass fraction of “X-ray amorphous” gold particles with size less than 4 nm (WSAXS) were determined. It has been found that the oxidative treatment of the carbon support before deposition of metallic gold precursor complexes has a significant effect on the size distribution of gold particles in the final catalyst. Comparison of the results of measuring the rate of CO oxidation by an excess of moist air at 40°C on Au/C catalysts with the (WSAXS) values found for these catalysts showed that the catalytic activity increases exponentially as (WSAXS) increases. High activity in CO oxidation reaction was demonstrated by Au/C catalysts with (WSAXS) ≥ 80%.

Sobre autores

Yu. Larichev

Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Autor responsável pela correspondência
Email: ylarichev@gmail.com
Russia, 630090, Novosibirsk, рrosp. Akad. Lavrentieva 5; Russia, 630090, Novosibirsk, Pirogov st., 1

B. Moroz

Novosibirsk State University

Email: ylarichev@gmail.com
Russia, 630090, Novosibirsk, Pirogov st., 1

P. Pyrjaev

Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences

Email: ylarichev@gmail.com
Russia, 630090, Novosibirsk, рrosp. Akad. Lavrentieva 5

V. Bukhtiyarov

Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: ylarichev@gmail.com
Russia, 630090, Novosibirsk, рrosp. Akad. Lavrentieva 5; Russia, 630090, Novosibirsk, Pirogov st., 1

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