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다공성 Al2O3관에 고정된 TiO2를 이용한 기상 아세트알데히드의 광촉매 분해
The Photocatalytic Decomposition of Acetaldehyde in Gas Phase Using Immobilized TiO2 on Porous Al2O3 Tube
연세대학교 화학공학과 1한국에너지기술연구소
Dept. of Chemical Engineering, Yonsei University, Korea 1Korea Institute of Energy Research, Korea
HWAHAK KONGHAK, October 2000, 38(5), 567-571(5), NONE
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Abstract
TiO2를 다공성 α-Al2O3관에 고정화하여 기상 acetaldehyde의 광분해에 대한 연구를 수행하였다. Sol-gel법과 현탁코팅법으로 TiO2를 고정화하였으며, 산화제로 O2와 H2O를 사용하였다. 현탁코팅법에 의해 제조된 고정화 광촉매가 가장 높은 활성을 보였고, TiO2 층의 두께가 10μm까지 효과적으로 사용되고 있음을 알 수 있었다. 첨가제의 영향에 있어서는 O2와 H2O가 모두 초기에 광반응을 유발시킬 수는 있었다. 그러나, O2는 광반응을 촉진시키고, H2O는 억제하는 서로 상반된 효과를 보였다. 초기농도가 증가할수록 광분해율이 감소하였으며, 근사적으로 1차 반응의 거동을 보였다. 25-70℃에서의 acetaldehyde의 광분해율은 거의 온도의 영향을 받지 않고 있었다.
A study on potocatalytic degradation of acetaldehyde was carried out by using the immobilized TiO2 on a porous α-Al2O3 tube. TiO2 was immobilized by sol-gel method or suspension coating method. The photocatalyst prepared by the suspension coating method showed the highest reactivity toward photocatalytic decomposition of acetaldehyde. Effective thickness of TiO2 layer was estimated to be about 10μm. Both O2 and H2O could initiate the photooxidation. O2 showed promotional effect on the photocatalytic oxidation, which H2O exhibited inhibition effect. The photocatalytic oxidation of acetaldehyde rate decreased with increasing initial concentration and showed first order expression. In the range of 25-70℃, photodecomposition of acetaldehyde was not affected by the temperature.
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References
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