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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Cunningham, Joseph Cullinane, Dennis Farrell, Frank Morris, Michael A. O'Driscoll, J. Patricia |
| Copyright Year | 1995 |
| Abstract | Comparisons of the oxygen-handling properties of calcined CeO2, CeO2–Al2O3, RhOx–CeO2, RhOx–CeO2/Al2O3 and La2O3–CeO2 materials are made on the basis of their experimentally observed abilities to bring about R0-type homophase oxygen isotope equilibration of an equimolar (16O2+18O2) mixture at room temperature, and/or to induce low onsettemperatures (ca. 550 K) for pairwise heterophase oxygen isotope-exchange between gas-phase 18O2 and oxygen-16 species from the oxide. Those oxygen equilibration/exchange processes were enhanced over precalcined RhOx–CeO2 materials prepared from chloride-free precursors, but not over La2O3–CeO2. That difference contrasted with expectations for similar concentrations of dopant-related, anion vacancy creation in each material, based upon XRD observations of the incorporation of each dopant into a slightly expanded CeO2(fluorite) lattice. Consideration is given not only to conventional contribution to oxygen equilibration/exchange by residual RhOX species at the RhOX–CeO2 surfaces, but also to ways in which bulk-incorporated, variable-valency rhodium ions can indirectly facilitate those processes. |
| Starting Page | 1027 |
| Ending Page | 1033 |
| Page Count | 7 |
| File Format | |
| ISSN | 09599428 |
| Volume Number | 5 |
| Issue Number | 7 |
| Journal | Journal of Materials Chemistry |
| DOI | 10.1039/JM9950501027 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Calcination Oxygen Isotope Isotopes of oxygen Ion X-ray crystallography Dopant Fluorite Crystal structure Rhodium |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Materials Chemistry |
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