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Effect of La Addition on the Performance of Three-Way Catalysts Containing Palladium and Rhodium

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Abstract

Three-way catalysts containing palladium and/or rhodium were prepared using γ­Al2O3 doped with lanthanum oxide as a support. All the samples were obtained by an incipient wetness impregnation of the support with an aqueous solution of nitrates. In order to investigate the metal–support interaction, the support was additionally calcined at 800 °C before the impregnation procedure. Characterization of the support thermally treated within a range of 600–1000 °C by low-temperature nitrogen absorption, X-ray diffraction analysis, and electron paramagnetic resonance spectroscopy has revealed that the treatment conditions strongly affect the textural properties, the phase composition and the concentration of electron-donor sites on the surface of the support. Deposition of metals by the impregnation of initial support with a joint solution of Pd and Rh nitrates has led to formation of small Pd–Rh alloyed nanoparticles with strong metal–metal interaction, which was confirmed by a testing reaction of ethane hydrogenolysis. No alloy formation was observed in the case of mechanical mixing of the separately prepared Pd-only and Rh-only catalysts as well as in the case of preliminary calcined support impregnated with a joint solution of Pd and Rh nitrates. Bimetallic Pd–Rh catalyst of alloyed type was shown to be the most promising in terms of catalytic performance and thermal stability.

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Acknowledgements

The study was financially supported by the Ministry of Education and Science of the Russian Federation within the framework of subsidizing agreement of October 23, 2017 (No. 14.581.21.0028, unique agreement identifier RFMEFI58117 × 0028) of the Federal Target Program “Research and development in priority directions of the progress of the scientific and technological complex of Russia for the years 2014–2020. Characterization of the samples was performed using the equipment of the Center of Collective Use “National Center of Catalysts Research”.

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  1. Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russian Federation, 630090

    Aleksey A. Vedyagin, Roman M. Kenzhin, Mikhail Yu. Tashlanov, Vladimir O. Stoyanovskii, Ilya V. Mishakov, Mikhail Yu. Smirnov, Alexander V. Kalinkin & Valerii I. Bukhtiyarov

  2. National Research Novosibirsk State University, Novosibirsk, Russian Federation, 630090

    Mikhail Yu. Tashlanov, Pavel E. Plyusnin, Yury V. Shubin, Ilya V. Mishakov & Valerii I. Bukhtiyarov

  3. Ecoalliance LLC, Novouralsk, Russian Federation, 624131

    Evgeny A. Alikin

  4. Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russian Federation, 630090

    Pavel E. Plyusnin & Yury V. Shubin

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Vedyagin, A.A., Kenzhin, R.M., Tashlanov, M.Y. et al. Effect of La Addition on the Performance of Three-Way Catalysts Containing Palladium and Rhodium. Top Catal 63, 152–165 (2020). https://doi.org/10.1007/s11244-019-01213-x

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