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Photocatalytic Synthesis of p-Anisaldehyde in a Mini Slurry-Bubble Reactor under Solar Light Irradiation |
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| Authors: | Dalia Heggo Shinichi Ookawara Teruhisa Ohno Toru Nakai Yoshihisa Matsushita Mona Gamal Eldin Masahiro Ohshima |
| Affiliation: | 1. Department of Chemical Engineering and Pilot Plant, National Research Centre, 33 Elbuhouth St., Dokki, Cairo, 12622 Egypt
Egypt-Japan University of Science and Technology, 179 New Borg El-Arab, Alexandria, 21934 Egypt Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 S1-26, O-okayama, Meguro-ku, Tokyo, 152-8552 Japan Department of Chemical Engineering, Kyoto University, Nishigyo-Ku, Kyoto, 616-8510 Japan;2. Egypt-Japan University of Science and Technology, 179 New Borg El-Arab, Alexandria, 21934 Egypt;3. Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu, 804-8550 Japan;4. Corporate Research Center, R & D Headquarters, Daicel Corporation, 1239, Shinzaike, Aboshi-ku, Himeji-shi, Hyogo, 671-1283 Japan;5. Department of Chemical Engineering, Kyoto University, Nishigyo-Ku, Kyoto, 616-8510 Japan |
| Abstract: | 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. |
| Keywords: | photocatalysis solar light organic synthesis titanium dioxide mini reactor |