Performance Test of $TiO_2$ Catalyst in VOCs Photocatalytic Degradation

VOCs 광촉매 분해용 $TiO_2$촉매제조 및 성능평가

  • Lee Seung-Bum (Department of Environmental Science, Kyungwon College) ;
  • Lee Jae-Dong (Department of Environmental Science, Kyungwon College) ;
  • Park Yoon-Shin (Central District of National Institute of Scientific Investigation)
  • 이승범 (경원전문대학 환경과학과) ;
  • 이재동 (경원전문대학 환경과학과) ;
  • 박윤신 (국립과학수사연구소 중부분소)
  • Published : 2005.12.01

Abstract

Titania gel formations were prepared by sol-gel method using titanium(IV) chloride $(TiCl_4)$, and its characteristics were analyzed by varying the $epoxide/TiCl_4$ ratio and the amount of water In the end, titania $(TiO_2)$ aerogel were prepared using supercritical drying process. VOCs such as benzene, toluene, and m-xylene (BTX) were oxidized using prepared titania aerogel and commercially available $TiO_2$, and its performance was compared. The surface area, pore volume, and average pore diameter of 1,2-epoxybutane are significantly smaller than the propylene oxide. And the titania aerogels with 6 moi of epoxides have high surface areas, pore volumes, and average pore diameters. As a result of photo-oxidation, conversion of benzene was reached about $70\%$, and other reactants were reached about $60\%$ similarly. The conversion of BTX was increased as inlet concentration decreased. The reactivity of titania calcined at $600^{\circ}C$ was greater than $400^{\circ}C$ and $800^{\circ}C$. Water is required as a reactants for the oxidation of VOCs, and the continuous consumption of hydroxyl radicals required replenishments to maintain catalyst activity. The activity ratio increased with increasing reaction time when enough amount of water was present in the reactor.

Keywords

References

  1. I. Sopyan, M. Watanabe, S. Murasawa, K. Hashimoto and A. Fujishima : An efficient $TiO_2$ thin-film photocatalyst ; Photocatalytic properties gas-phase acetaldehyde degradation, J. Photochem. & Photobiol., 98, 79-86, 1996 https://doi.org/10.1016/1010-6030(96)04328-6
  2. D. J. Suh : Synthesis of aerogel and their applications in catalysis, Prospec. of Ind. Chem., 4(3), 53-63, 2001
  3. S.-B. Lee and J.-D. Lee : Catalytic oxidation of VOCs using photocatalysis, Korean J. Sanitation, 18(2), 52-59, 2003
  4. A. E. Gash, T. M. Tillotson, J. H. Jr, L and W. Hrubesh : J. Non-Crystal., 285, 22, 2001 https://doi.org/10.1016/S0022-3093(01)00427-6
  5. S. B. Kim, H. T. Hwang, and S. C. Hong : Photocatalytic degradation of volatile organic compounds at the gas-solid interface of a $TiO_2$ photocatalyst, Chemsphere, 48, 473-484, 2002 https://doi.org/10.1016/S0045-6535(02)00101-7
  6. L. Cao, A. Huang, F. J. Spiess, and S. L. Suib : Gas-phase oxidation of 1-butane using nanoscale $TiO_2 photocatalysts, J. Catal., 188, 48-57, 1999 https://doi.org/10.1006/jcat.1999.2596
  7. H. S. Lee, J. H. Kim, and H. I. Lee : Effect of heat treatment on the crystallinity and the activity of $TiO_2 photocatalyst for the degradation of a pyrrolidine derivative, Appl. Chem., 3(2), 212-215, 1999