| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 97 === CO2 reduction was investigated in this work using InTaO4 visible light photocatalyst to solve the greenhouse effects of CO2 and to produce renewable energy. InTaO4 is able to absorb visible light and allow the use of solar energy. The gas phase photo reduction was observed over a series of InTaO4 and NiO loaded catalyst prepared by the sol-gel method, thereafter catalysts were dip coated on optical fibers and calcined. SEM micrographs show a thin film coated on the optical fiber. The UV-VIS spectra of powdered InTaO4 as well as NiO loaded catalysts prepared via the same procedure indicate that both catalysts absorb visible light. XRD results of catalysts calcined at 1100°C show the crystallinity of InTaO4. A photoreactor with 216 optical fibers and 100W halogen visible light source was used in the photo-reduction of CO2. The production of methanol and traces other hydrocarbons were detected by GC/FID. The production rate of methanol at 25°C was 11.05μmol/g-hr, indicating that NiO/InTaO4 photocatalyst is able to reduce CO2 at low temperature. Increasing the reaction temperature to 75°C increases the production rate to 20.97 μmol/g-hr. This suggests that if solar energy is used, the heat from sunlight may also increase the production rate. Using solar energy, the production rate was 11.30μmol/g-hr which is comparable to the result using artificial visible light.
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