In this work, we investigate the effect of TiO2 properties on the photocatalytic selective hydrogenation of 3-nitrostyrene (3-NS) to 3-vinylaniline (3-VA). The P25-TiO2 photocatalysts were calcined at 600–900 °C using different gases (Air, N2, and H2) and characterized by XRD, N2 physisorption, XPS, UV-Vis, and PL spectroscopy. In the photocatalytic hydrogenation of 3-nitrostyrene in isopropanol, the selectivity of 3-vinylaniline of the treated TiO2 was almost 100%. A linear correlation between the 3-NS consumption rate and PL intensity was observed. Among the catalysts studied, P25-700-air, which possessed the lowest PL intensity, exhibited the highest photocatalytic activity due to the synergistic effect that resulted from its high crystallinity and the optimum amount of anatase/rutile phase content, leading to the reduction of the electron-hole recombination process.
In this work, P25-TiO2 was treated by calcination in air at difference temperature (600-900°C) for 5h. Treated catalysts were tested in photocatalytic selective hydrogenation of 3-nitrostyrene (3-NS) to 3-vinylaniline (3-VA). The properties of treated catalysts were characterized by using XRD, XPS, and UV-Vis spectroscopy. 3-vinylaniline and acetone were produced from photocatalytic (λ > 300nm) selective hydrogenation reaction of 3-nitrostyrene in 2-propanol and suspension with P25-TiO2. The Ti3+ at locate with oxygen defect, which at below conduction band were acted as active site for trapped electron to conduction band. These effects leading to excess oxygen defect caused low activity due to recombination center. An optimal calcination temperature was 700°C ascribed to the enhancement of high conversion (71%) with 100% 3-VA selectivity due to optimal oxygen vacancies.
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