Oxidation characterization of VOCs over noble metal catalyst using water treatment

Water 수처리를 이용한 귀금속 촉매의 VOCs 산화특성

  • Received : 2004.09.30
  • Accepted : 2005.03.03
  • Published : 2005.04.25

Abstract

Volatile organic compounds (VOCs) have been recognized as major contributor to air pollution. The catalytic oxidationis is one of the most important processes for VOCs destruction due to the possibility getting high efficiency at low temperature. In this study, monometallic Pt, Ir and bimetallic Pt-Ir were supported to $TiO_2$. In order to distribute metals uniformly, $H_2O-H_2$ treatment method was used. Xylene, toluene and MEK were used as reactants. The monometallic or bimetallic catalysts were prepared by the excess wetness impregnation method and characterized by XRD, XPS, and TEM analysis. Pt catalyst showed higher conversion than Ir catalyst and Pt-Ir bimetallic catalyst showed the highest conversion. The catalysts prepared by $H_2O-H_2$ treatment had better VOC's conversion than that of nothing treatment. In the VOCs oxidation, Pt-Ir bimetallic catalysts had multipoint active sites, so it improved the range of Pt metal state. Therefore, bimetallic catalysts showed higher conversion of VOCs than monometallic ones. $H_2O-H_2$ treatment effected an uniform distribution of Pt particles. In VOCs oxidation was found to follow first order reaetion kinetics. The activation energy of $H_2O-H_2$ treatment catalysts was lower than that of untreated ones. In this study, the a small amount of Ir was used with Pt to promote the oxidation conversion of VOCs.

Keywords

volatile organic compounds (VOCs);Pt-Ir;$H_2O-H_2$ treatment catalytic oxidation;bimetallic catalyst

References

  1. P. Papaefthimiou, T. Ioannides, X. E. Verykios, 'Combustion of non-halogenated volatile organic compound over group VIII metal catalysts', Appl. Catal. B, 13, 175-184(1997) https://doi.org/10.1016/S0926-3373(96)00103-8
  2. Y.G. Borodko, L. Ioffe, T. Halachev, P. Bosch, A. Cuan, I.N. Ivleva, Y.M. Shulga, 'Interaction of $Pt/TiO_2$ samples with H2 and O2 : magnetic and structural properies', Mat. Chem, 58, 199-203(1999) https://doi.org/10.1016/S0254-0584(98)00240-5
  3. J.C.Yang, Y.C.Kim, Y.G.Shul, C.H. Shin, T.K.Lee, 'Characterization of photoreduced Pt/TiO2 and decomposition of dichloroacetic acid over photoreduced $Pt/TiO_2$ catalysts', App. Surface. Science, 121/122, 525-529(1997) https://doi.org/10.1016/S0169-4332(97)00359-0
  4. M. Zhang, B. Zhou, K. T. Chuang, 'Catalytic deep oxidation of volatile organic compouns over fluorianted carbon supported platinium catalysts at low temperatures', App. Catal. B, 13, 123-130(1997) https://doi.org/10.1016/S0926-3373(96)00097-5
  5. K.D. Schierbaum, S. Fischer, M.C. Torquemada, J.L. de Segovia, E.Roman, J.A. Martin-Gago, 'The interaction of Pt with $TiO_2(110)$ surface: a comparative XPS, UPS, ISS, and ESD study', Surf. Science, 345, 261-273(1996) https://doi.org/10.1016/0039-6028(95)00887-X
  6. J. C. Wu, Z. Lin, F. Tsai, Jen-Wei Pan, 'Low-temperature complete oxidation of BTX on Pt/activated carbon catalysts', Cat. Today, 63, 419-426(2000) https://doi.org/10.1016/S0920-5861(00)00487-9
  7. F. I. Khan, A. Kr. Ghoshal, 'Removal of Volatile Organic compounds from polluted air' J. Loss, 13, 527-545(2000) https://doi.org/10.1016/S0950-4230(00)00007-3
  8. A. Hinz, P. Larsson, B. Skarman, Arne Andersson, 'Platinium on alumina, titania, and magnesia supports for the combustion of methanol in a waste gas with trace amount of ammonia', App. Catal. B, 34, 161-178(2001) https://doi.org/10.1016/S0926-3373(01)00210-7
  9. 조영일, '반응공학', 형설출판사, 1982

Acknowledgement

Supported by : 청주대학교