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Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation

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Abstract

Bimetallic Pd-Rh catalysts with precious metal loading of 0.2 wt% was prepared by incipient wetness impregnation of the support (γ-Al2O3 or δ-Al2O3) with dual complex salt [Pd(NH3)4]3 [Rh(NO2)6]2. Monometallic Pd and Rh catalysts as well as its mechanical mixture were used as the reference samples. All samples were exposed for in situ prompt thermal aging procedure, and characterized by EPR spectroscopy, UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The nature of the support was found to have strong effect on high temperature stability of the samples. δ-Al2O3 having non-uniform phase structure due to presence of θ-Al2O3 and α-Al2O3 traces causes the concentrating of rhodium near the interphase boundary, thus changing the mechanism of Rh3+ bulk diffusion if compare with γ-Al2O3. No noticeable anchoring effects were observed for bimetallic Pd-Rh samples neither in terms of Rh bulk diffusion nor with regard to the Pd sintering. It has been found experimentally that phase transformation of γ-Al2O3 at high temperatures does not play dramatic role for the deactivation of bimetallic Pd-Rh active species anchored to the electron-donor site of the support.

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Acknowledgments

This work was supported by Russian Academy of Sciences and Federal Agency of Scientific Organizations (project V.45.3.2). The authors are grateful to M.S. Mel’gunov, T.Ya. Efimenko, and T.A. Komnik for their assistance in catalyst testing and characterization.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia

    Aleksey A. Vedyagin, Alexander M. Volodin, Vladimir O. Stoyanovskii, Roman M. Kenzhin & Ilya V. Mishakov

  2. National Research Tomsk Polytechnic University, Tomsk, 634050, Russia

    Aleksey A. Vedyagin & Ilya V. Mishakov

  3. Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk, 630090, Russia

    Pavel E. Plyusnin & Yury V. Shubin

  4. Novosibirsk State University, Novosibirsk, 630090, Russia

    Pavel E. Plyusnin, Yury V. Shubin & Ilya V. Mishakov

Authors
  1. Aleksey A. Vedyagin
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  2. Alexander M. Volodin
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  3. Vladimir O. Stoyanovskii
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  4. Roman M. Kenzhin
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  5. Pavel E. Plyusnin
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  6. Yury V. Shubin
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  7. Ilya V. Mishakov
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Correspondence to Aleksey A. Vedyagin.

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Vedyagin, A.A., Volodin, A.M., Stoyanovskii, V.O. et al. Effect of Alumina Phase Transformation on Stability of Low-Loaded Pd-Rh Catalysts for CO Oxidation. Top Catal 60, 152–161 (2017). https://doi.org/10.1007/s11244-016-0726-4

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  • DOI: https://doi.org/10.1007/s11244-016-0726-4

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