CO2 photoreduction using internally illuminated monolith reactor
Date Issued
2010
Date
2010
Author(s)
Liou, Pei-Yin
Abstract
Global warming and fuel shortage are undeniable enviromental and energy problems nowadays. To solve these two problems, CO2 and water can be converted into organic compounds via photocatalysts under light irradiation, which is also called artificial photosynthesis. In the research, sol-gel prepared SiO2 and NiO/InTaO4 were coated sequentially on monolith to form multilayer structure. The catalyst was calcined to form crystal at 1100 oC. PMMA fibers with caves which can increase the side emission of light were put inside each channel of monolith. Furthermore, the end of the fibers was deposited a mirror to increase the light refletance from the end. The UV−VIS spectra of powder InTaO4 as well as NiO loaded InTaO4 indicated that both photocatalysts could absorb visible light. Pure InTaO4 was observed from XRD pattern. From SEM images, uniform catalyst layer and NiO were formed on monolith surface. The methanol yield achieved 0.16 µmol/g•h with visible light intensity of 42.46 mW/cm2 at 25°C. The product shifted to acetaldehyde under AM1.5G sunlight irradiation which yield obtained was 0.3 µmol/g•h at 70 °C on 2.6%NiO/InTaO4.
Subjects
Monolith reactor
InTaO4 photocatalyst
Type
thesis
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