The Structure and Catalytic Properties of Rh-Doped CeO2 Catalysts Full article
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PCCP: Physical Chemistry Chemical Physics
ISSN: 1463-9076 , E-ISSN: 1463-9084 |
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| Output data | Year: 2017, Volume: 19, Number: 47, Pages: 31883-31897 Pages count : 15 DOI: 10.1039/c7cp06573f | ||||||
| Tags | METAL-SUPPORT INTERACTION; TEMPERATURE CO OXIDATION; X-RAY; ELECTRONIC INTERACTION; CHEMICAL-PROPERTIES; Pd/CeO2 CATALYSTS; Rh/CeO2 CATALYST; LOCAL-STRUCTURE; SOLID-SOLUTION; NOBLE-METALS | ||||||
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Funding (1)
| 1 | Federal Agency for Scientific Organizations | 0303-2016-0003 |
Abstract:
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.
Cite:
Derevyannikova E.A.
, Kardash T.Y.
, Kibis L.S.
, Slavinskaya E.M.
, Svetlichnyi V.A.
, Stonkus O.A.
, Ivanova A.S.
, Boronin A.I.
The Structure and Catalytic Properties of Rh-Doped CeO2 Catalysts
PCCP: Physical Chemistry Chemical Physics. 2017. V.19. N47. P.31883-31897. DOI: 10.1039/c7cp06573f WOS Scopus РИНЦ ANCAN PMID OpenAlex
The Structure and Catalytic Properties of Rh-Doped CeO2 Catalysts
PCCP: Physical Chemistry Chemical Physics. 2017. V.19. N47. P.31883-31897. DOI: 10.1039/c7cp06573f WOS Scopus РИНЦ ANCAN PMID OpenAlex
Dates:
| Submitted: | Sep 26, 2017 |
| Accepted: | Nov 8, 2017 |
| Published online: | Nov 9, 2017 |
| Published print: | Dec 1, 2017 |
Identifiers:
| Web of science: | WOS:000417295800038 |
| Scopus: | 2-s2.0-85038353009 |
| Elibrary: | 32274796 |
| Chemical Abstracts: | 2017:1783986 |
| Chemical Abstracts (print): | 168:518003 |
| PMID: | 29177291 |
| OpenAlex: | W2767377616 |