Supported vanadia catalyst have attracted significant interest due to their good catalytic performance in many redox reactions, e.g., dehydrogenation and oxidative dehydrogenation of alkanes to olefins, oxidation of methanol to formaldehyde, and selective reduction of NOx. The structure of VOx supported on alumina (δ-, α-, and γ-Al2O3) was studied using different techniques. UV Raman spectra of hydrated V-δ-Al2O3 were similar to the visible spectra. Comparing the UV and visible Raman spectra of V/δ-Al2O3 samples, two kinds of V=O band shift could be distinguished: a shift as a function of excitation wavelength for the same sample and a shift as a function of surface VOx density for different samples. The Raman, UV-visible DRS, and H2-TPR results showed that the structure, distribution, and reducibility of surface VOx species on γ-Al2O3 are similar to those on δ-Al2O3. This is an abstract of a paper presented at the ACS Fuel Chemistry Meeting (San Diego, CA Spring 2005).
|Number of pages||2|
|Journal||ACS Division of Fuel Chemistry, Preprints|
|Publication status||Published - Jul 26 2005|
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