Characterization and Catalytic Functionalities of Copper Oxide Catalysts Supported on Zirconia
| Autor: | Vattikonda Venkat Rao, Guggilla Vidya Sagar, Komandur V. R. Chary, Chakravarthula S. Srikanth |
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| Rok vydání: | 2006 |
| Předmět: |
Copper oxide
Materials science Diffuse reflectance infrared fourier transform Inorganic chemistry Cyclohexanol chemistry.chemical_element Copper Surfaces Coatings and Films Catalysis chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Materials Chemistry Cubic zirconia Dehydrogenation Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry B. 111:543-550 |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | A series of zirconia supported copper oxide catalysts with varying copper loadings (1.2-19.1 wt %) were prepared by impregnation method. The catalysts were characterized by X-ray diffraction, UV-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), and temperature-programmed desorption of CO2. Copper dispersion and metal area were determined by N2O decomposition method. X-ray diffraction patterns indicate the presence of crystalline CuO phase beyond 2.7 wt % of Cu on zirconia. UV-visible diffuse reflectance spectra suggest the presence of two types of copper species on the ZrO2 support. XPS peaks intensity ratio of Cu 2p3/2 and Zr 3d5/2 was compared with Cu dispersion calculated from N2O decomposition. TPR patterns reveal the presence of highly dispersed copper oxide at lower temperatures and bulk CuO at higher temperatures. The basicity of the catalysts was found to increase with Cu loading, and the activity of the catalysts was also found to increase with the increase in Cu loading up to 2.7 wt % Cu loading. The catalytic properties were evaluated for the dehydrogenation of cyclohexanol to cyclohexanone and were related to surface properties of the copper species supported on zirconia. |
| Databáze: | OpenAIRE |
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