Synthesis, Characterization, and Activity Studies of Vanadia Supported on Zirconia and Phosphorus-Modified Zirconia
| Autor: | and Zhang Ju, L. Jhansi Lakshmi, Elmer C. Alyea |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Chemistry
Inorganic chemistry Vanadium chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics law.invention Transition metal law Electrochemistry Magic angle spinning General Materials Science Vanadate Cubic zirconia Fourier transform infrared spectroscopy Electron paramagnetic resonance Spectroscopy |
| Zdroj: | Langmuir. 15:3521-3528 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la981103m |
| Popis: | A series of catalysts with vanadia contents varying between 1 and 14 wt % were prepared by the wet impregnation technique on zirconia and phosphorus-modified zirconia. The catalysts were characterized by employing X-ray diffraction (XRD), electron spin resonance (ESR) spectroscopy, 51V, 31P, and 1H solid-state magic angle spinning nuclear magnetic resonance (MAS NMR), Fourier transform Raman spectroscopy (FT-Raman), diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), and Brunauer−Emmett−Teller (BET) surface area measurements. The activities of the catalysts were determined by an ethanol partial oxidation reaction. 51V solid-state NMR studies of both series of catalysts indicated the presence of tetrahedral vanadate species at lower loadings, and octahedrally coordinated vanadium species at higher concentrations. DRIFTS studies of the catalysts were in conformity with NMR studies as the vibrations corresponding to tetrahedral vanadate species were observed at low V2O5 loadings and at high... |
| Databáze: | OpenAIRE |
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