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Extended Possibilities of Analysis for Supported Metal Catalysts and Nanocomposites by Dynamic Light Scattering

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Abstract

This study is a continuation of the work on the use of dynamic light scattering (DLS) for the analysis of active component particle sizes in supported catalysts. It was shown that the proposed STS (from solid to sol) approach is also applicable to supported catalysts based on sparingly soluble supports and nanocomposites. It was found that partial dissolution or destruction of a support with the formation of solution containing the desired nanoparticles is sufficient for effective DLS analysis. It was found that, under certain conditions, the effect of secondary aggregation of nanoparticles in solution can be observed in the course of catalyst dissolution, and this effect can prevent correct measurements. A method was proposed to avoid the secondary aggregation of particles in the course of the selective dissolution of a support. A good agreement between the results obtained by the new (DLS) method and traditional (TEM and XRD) methods was demonstrated.

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Notes

  1. The selective dissolution of carbon supports can also be performed by heating them at T > 350°C in organic solvents (quinoline, tetralin, etc.) with hydrogen donors by analogy with processes of the thermal dissolution of coals [20]. However, this procedure is much more cumbersome to implement and much less versatile in terms of dissolving other types of supports; therefore, the decomposition in sulfuric acid upon heating was used.

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ACKNOWLEDGMENTS

I am grateful to A.V. Ishchenko, N.A. Alekseeva, N.N. San’kova, and E.V. Parkhomchuk for their assistance in conducting the experiments and to the Center for Collective Use High Technologies and Analytics of Nanosystems, Novosibirsk State University for the provision of measuring equipment.

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation and carried out within the framework of a state contract of the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences (project no. AAAA-A21-121011390053-4).

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    Yu. V. Larichev

  2. Novosibirsk State University, 630090, Novosibirsk, Russia

    Yu. V. Larichev

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  1. Yu. V. Larichev
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Correspondence to Yu. V. Larichev.

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Translated by V. Makhlyarchuk

Abbreviations and notation: DLS, dynamic light scattering; TEM, transmission electron microscopy; XRD, X-ray diffraction; STS, from solid to sol; CSR, coherent scattering region.

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Larichev, Y.V. Extended Possibilities of Analysis for Supported Metal Catalysts and Nanocomposites by Dynamic Light Scattering. Kinet Catal 63, 599–605 (2022). https://doi.org/10.1134/S002315842205007X

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