Dense photocatalyst slurry was employed for the synthesis of
p-anisaldehyde under solar light irradiation. An Fe-modified rutile TiO
2 (Fe-TiO
2, 34.5 m
2/g) photocatalyst was used as a visible-light-responsive photocatalyst. A conventional TiO
2 (P25, 35 m
2/g) photocatalyst was also examined as a reference catalyst. XRD patterns and diffuse reflectance spectra showed that Fe-TiO
2 consists of 100 % rutile phase and absorbs more visible light compared to P25, respectively. The catalyst powder was suspended in an ethyl acetate solution of
p-methoxytoluene in the mini-reactor, with oxygen bubbling, under a solar simulator, visible light, and UV LEDs.
p-anisaldehyde, as a reaction product, was analyzed by sampling using gas-chromatograph. Regardless of the light source, Fe-TiO
2 always outperformed P25 in terms of both generation rates (GR) of
p-anisaldehyde and energy requirements (ER). It was demonstrated that the highly dense Fe-TiO
2 slurry was efficient for the synthesis under solar light owing to the small size of the reactor. The small amount of Pt and ZrO
2 cocatalysts significantly enhanced the GR under solar light. By adopting a visible light responsive Fe-TiO
2 photocatalyst, the mini slurry-bubble reactor under solar light achieved a high GR per catalyst mass (CM), which is one to two orders higher than that reported by most previous studies with high-power lamps.
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