Characterization of different Pt–Ru catalysts by X-ray diffraction and transmission electron microscopy
| Autor: | Hartmut Fuess, Christina Roth, Nathalie Martz |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Chemistry
Stereochemistry Alloy Analytical chemistry Oxide General Physics and Astronomy chemistry.chemical_element engineering.material Catalysis Ruthenium chemistry.chemical_compound Transition metal Transmission electron microscopy X-ray crystallography engineering Physical and Theoretical Chemistry Platinum |
| Zdroj: | Physical Chemistry Chemical Physics. 3:315-319 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/b004887i |
| Popis: | Carbon-supported Pt–Ru (1:1)-catalysts have been synthesized by two reduction methods in an aqueous phase and in a third way in an organic solution and characterized in comparison to a commercial Pt–Ru/C catalyst purchased from E-TEK. X-ray diffraction and transmission electron microscopy were carried out on the different samples in the as-synthesized state and after heat-treatment at 500°C in nitrogen and air atmospheres respectively. Powder patterns of the different catalysts in the as-synthesized state reveal a fcc pattern with d values matching or close to platinum. No evidence of metallic Ru or any oxide phases was found. After heat-treatment in nitrogen Ru reflections occur in the synthesized catalyst samples, backing the supposition of separate platinum and ruthenium particles instead of a Pt–Ru alloy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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