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Synthesis of Nanocrystalline Powders in the CеO2〈ZrO2〉–Al2O3 System by the Citrate Sol–Gel Method

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Abstract—

Weakly aggregated, highly dispersed precursor powders with a specific surface area of 350–360 m2/g have been prepared by the citrate sol–gel method in the CеO2〈ZrO2〉–Al2O3 system. Heat treatment of the precursors in the temperature range 700–1000°C led to the formation of powders based on a fluorite-like Ce0.7Zr0.3O2 solid solution with a crystallite size under 30 nm. The presence of alumina has been shown to inhibit the Ce0.7Zr0.3O2 crystallite growth process. Using low-temperature nitrogen adsorption measurements, we have studied texture characteristics of the powders obtained at 1000°C: they have a specific surface area of 90 and 105 m2/g and a specific pore volume of up to 0.380 cm3/g, with a unimodal pore size distribution in the range 2.5–10 nm. We examine the effect of thermal “aging” at a temperature of 1000°C for 50 h on the structure and particle size of the powders. Based on the experimental data obtained, we propose a process for the synthesis of nanocrystalline mesoporous powders in the CеO2〈ZrO2〉–Al2O3 system for the preparation of supports of an active phase (Pt, Pd, or Rh) in three-way catalysts.

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ACKNOWLEDGMENTS

We are grateful to A.E. Lapshin for doing the X-ray diffraction work and to I.A. Drozdova for performing the electron-microscopic characterizations of the precursor powders.

Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education through the state research target for the Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, as part of the research theme Inorganic Synthesis and Characterization of Ceramic and Organic–Inorganic Composite Materials and Coatings, state registration (Executive Branch’s Center for Information Technologies and Systems) no. AAAA-A19-119022290091-8.

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  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    L. V. Morozova

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  1. L. V. Morozova
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Correspondence to L. V. Morozova.

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Translated by O. Tsarev

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Morozova, L.V. Synthesis of Nanocrystalline Powders in the CеO2〈ZrO2〉–Al2O3 System by the Citrate Sol–Gel Method. Inorg Mater 57, 154–163 (2021). https://doi.org/10.1134/S0020168521020096

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