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Enhanced Thermal Stability of Pd/Ce–Sn–O Catalysts for CO Oxidation Prepared by Plasma-Arc Synthesis

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Abstract

The plasma-arc (PA) method was applied for the highly efficient synthesis of Pd/Ce–Sn–O catalysts for CO oxidation. Using the PA sputtering of a graphite electrode together with Pd, Ce and Sn metallic components in inert atmosphere, a PdCeSnC composite was obtained. After the subsequent calcination in oxygen over the temperature range of 600–1000 °C, the initial composites were transformed into active catalysts of CO oxidation at low temperatures (LTO CO). Catalytic testing showed that these PA-prepared Pd/Ce–Sn–O catalysts were characterized by unusually high thermal stability. The catalysts demonstrated the excellent LTO CO performance after calcination at 1000 °C. According to the XRD and HRTEM observations, the Pd/Ce–Sn–O catalysts can be described as heterogeneous structures consisting of small CeO2 and SnO2 particles that interact with each other, forming extended grain boundaries and a composite structure. The TPR-CO and XPS methods detected highly dispersed Pd species in the active catalysts, namely Pd2+ in the lattice of ceria (a Pd-ceria solid solution) and the PdOx clusters on the surface. Deactivation of the Pd/Ce–Sn–O is governed by decomposition of the Pd-ceria solid solution accompanied by the sintering of the PdOx clusters and formation of the metallic and oxide palladium nanoparticles. Oxygen species with high mobility in the Pd/Ce–Sn–O catalyst were detected by a TPR-CO method. The amount of the highly mobile oxygen species is in five times higher for the Pd/Ce–Sn–O catalyst then for the Pd/CeO2 sample. Promising perspectives of the plasma-arc application for catalyst the synthesis of with improved properties are discussed.

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Acknowledgements

This work was partially supported by the Skolkovo Foundation (Grant agreement for Russian educational organizations No. 3 of December 25, 2014), RFBR Grant 14-03-01088 and budget project No. 0303-2016-0003 for Boreskov Institute of Catalysis.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

    T. Yu Kardash, E. M. Slavinskaya, R. V. Gulyaev & A. I. Boronin

  2. Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

    A. V. Zaikovskii & S. A. Novopashin

  3. Novosibirsk State University, Novosibirsk, Russia

    E. M. Slavinskaya, R. V. Gulyaev & A. I. Boronin

  4. Research and Educational Center for Energy Efficient Catalysts, Novosibirsk state University, Novosibirsk, Russia

    T. Yu Kardash

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  1. T. Yu Kardash
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  2. E. M. Slavinskaya
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  3. R. V. Gulyaev
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  4. A. V. Zaikovskii
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  5. S. A. Novopashin
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  6. A. I. Boronin
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Correspondence to A. I. Boronin.

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Kardash, T.Y., Slavinskaya, E.M., Gulyaev, R.V. et al. Enhanced Thermal Stability of Pd/Ce–Sn–O Catalysts for CO Oxidation Prepared by Plasma-Arc Synthesis. Top Catal 60, 898–913 (2017). https://doi.org/10.1007/s11244-017-0755-7

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