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Issue 47, 2017
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The structure and catalytic properties of Rh-doped CeO2 catalysts

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The average structure and the local structure of nanocrystalline Rh-doped CeO2 catalysts, prepared using a co-precipitation method, were studied using a set of structural (PDF, HRTEM, XRD) and spectral (XPS, Raman spectroscopy) methods. The samples with Rh content less than 10 wt%, calcined at 450 °C, were homogeneous solid solutions. A comparison of the experimental results and Pair distribution function (PDF) modeling data showed that Rh3+ substitutes Ce4+ ions in the fluorite phase. Charge equilibrium is obtained by the oxygen vacancy for each Rh3+ cation introduced into the ceria cell. The solid solution demonstrated high catalytic activity in low-temperature CO oxidation (LTO CO). The solid solutions were stable only in a nanocrystalline state and decomposed upon thermal treatment. The calcination of the solid solution at T > 450 °C results in a decrease in the catalytic activity that is accompanied by Rh association in the subsurface area and strong distortion of the anionic subcell. At T = 800 °C α-Rh2O3 nanoparticles are formed on the surface of the fluorite phase. The XRD-detectable Rh oxide phases are formed after calcination at 1000 °C. However, some parts of Rh within the subsurface RhxCe1−xO2−δ solid solution remain and they preserve catalytic properties for low-temperature oxidation.

Graphical abstract: The structure and catalytic properties of Rh-doped CeO2 catalysts

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The article was received on 26 Sep 2017, accepted on 08 Nov 2017 and first published on 09 Nov 2017

Article type: Paper
DOI: 10.1039/C7CP06573F
Phys. Chem. Chem. Phys., 2017,19, 31883-31897

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    The structure and catalytic properties of Rh-doped CeO2 catalysts

    E. A. Derevyannikova, T. Yu. Kardash, L. S. Kibis, E. M. Slavinskaya, V. A. Svetlichnyi, O. A. Stonkus, A. S. Ivanova and A. I. Boronin, Phys. Chem. Chem. Phys., 2017, 19, 31883
    DOI: 10.1039/C7CP06573F

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