Catalysis on Mono- and Bimetallic Nanoparticles of the Silver–Copper System CunAgm

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Abstract

The purpose of this work is to study the catalytic properties of mono- and bimetallic nanoparticles of the copper-silver system of variable composition supported on aluminum oxide in the conversion reactions of protium modifications and deuterium-hydrogen exchange. From a comparison of the temperature dependences of the specific catalytic activity of the samples in the two reactions under study, a conclusion was drawn about different reaction mechanisms. It has been shown that, compared to bulk metals, nanoparticles of the CunAgm composition have catalytic properties in a wide temperature range, up to 77 K. In the chemical reaction of isotope exchange in molecular hydrogen, a synergistic effect is observed, which indicates the interaction of metals in biparticles.

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About the authors

M. B. Pshenitsyn

Dmitry Mendeleev University of Chemical Technology of Russia

Author for correspondence.
Email: pshenmichail@gmail.com
Russian Federation, Miusskaya square, 9, Moscow, 125047

O. A. Boeva

Dmitry Mendeleev University of Chemical Technology of Russia

Email: pshenmichail@gmail.com
Russian Federation, Miusskaya square, 9, Moscow, 125047

A. S. Konopatsky

National University of Science and Technology “MISiS”

Email: pshenmichail@gmail.com
Russian Federation, Leninskiy prosp., 4, Moscow, 119049

A. Y. Antonov

Dmitry Mendeleev University of Chemical Technology of Russia

Email: pshenmichail@gmail.com
Russian Federation, Miusskaya square, 9, Moscow, 125047

K. N. Zhavoronkova

Dmitry Mendeleev University of Chemical Technology of Russia

Email: pshenmichail@gmail.com
Russian Federation, Miusskaya square, 9, Moscow, 125047

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Supplementary files

Supplementary Files
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2. Fig. 1. TEM images and size distributions of Cu, Ag monoparticles and CunAgm binary particles.

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3. Fig. 2. TEM images of particles (a, c) and the result of fast Fourier transform (FFT) processing of the left particle (b).

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4. Fig. 3. Superimposed elemental maps (a, c) of Cu (red dots) and Ag (green dots) with the corresponding HAADF images (b, d).

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5. Fig. 4. TPV (a) and TPO (b) profiles on samples with Cu, Ag and CunAgm particles.

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6. Fig. 5. Results of adsorption studies (77 K) of samples: orange columns – initial specific surface area, blue columns – stable specific surface area.

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7. Fig. 6. Dependence of lgKud on 1000/T for a sample with Cu nanoparticles: red dots – deuterium-hydrogen exchange; green – magnetic conversion of protium.

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8. Fig. 7. Dependence of lgKud on 1000/T for a sample with Ag nanoparticles: red dots – deuterium-hydrogen exchange; green – magnetic conversion of protium.

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9. Fig. 8. Dependences of lgKud on 1000/T for samples with nanoparticles: a – Cu75Ag25, b – Cu50Ag50, c – Cu25Ag75: red dots – deuterium-hydrogen exchange; green – magnetic conversion of protium.

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10. Fig. 9. Catalytic activity of bimetallic nanoparticles in the reaction of conversion of hydrogen modifications.

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11. Fig. 10. Dependence of specific catalytic activity at –196°C on the composition of mono- and bimetallic nanoparticles in reactions: a – ortho-para-conversion of protium, b – deuterium-hydrogen exchange.

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