Add time:07/30/2019         Source:sciencedirect.com

Photooxidation of alcohols without solvents in the presence of O2 takes place at the atmospheric pressure and room temperature over niobium oxide. From the results of photooxidation of 1-pentanol over niobium oxides calcined at various temperatures, we judged that niobium oxide calcined at 773 K exhibits the highest activity and niobium oxides calcined at ≥873 K shows the higher selectivity to partial oxidation products than those calcined at ≤773 K. The reaction activity correlates to the BET specific surface area and crystallinity drawn from BET, TG-DTA, XRD and laser Raman measurements. The selectivity to partial oxidation products correlates to the amount of Lewis acid sites from FT-IR spectra of pyridine and NH3 adsorbed niobium oxide catalysts, suggesting that Lewis acid sites play a role as an active site for total oxidation.

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