Gas Permeation Characteristics of Silica Membrane Prepared by Ultrasonic Spray Pyrolysis

초음파 분무 열분해법에 의해 합성한 실리카 막의 기체 투과 특성

  • Lee Kew-Ho (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Youn Min-Young (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Park Sang-Jin (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Lee Dong-Wook (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology) ;
  • Sea Bongkuk (Membranes and Separation Research Center, Korea Research Institute of Chemical Technology)
  • 이규호 (한국화학연구원 분리막다기능소재연구센터) ;
  • 윤민영 (한국화학연구원 분리막다기능소재연구센터) ;
  • 박상진 (한국화학연구원 분리막다기능소재연구센터) ;
  • 이동욱 (한국화학연구원 분리막다기능소재연구센터) ;
  • 서봉국 (한국화학연구원 분리막다기능소재연구센터)
  • Published : 2005.06.01

Abstract

Silica membranes were prepared on a porous metal sheet by ultrasonic spray pyrolysis method for gas separation at high temperatures. In order to improve the permselectivity, silica was deposited in the sol-gel derived $silica/\gamma-alumina$ intermediate layer by pyrolysis of tetraethyl orthosilicate (TEOS) at 873 K. The pyrolysis with forced cross flow through the porous wall of the support was very effective in plugging mesopores, Knudsen diffusion regime, that were left unplugged in the membranes. At permeation temperature of 523 K, the silica/alumina composite membrane showed $H_2/N_2$ and water/methanol selectivity as high as 17 and 16, respectively, by molecular sieve effect.

표면 개질한 다공성 금속 지지체에 초음파 분무 열분해법을 이용하여 silica막을 합성하고, 고온 기체 선택 투과 분리 특성을 조사하였다. Tetraethyl orthosilicate (TEOS)를 전구체로 하여 지지체 세공을 통한 감압 진공을 하면서 873K에서 표면에 defect 없이 균일한 양질의 silica막이 형성되었다. 투과 온도 523 K에서 silica막의 수th/질소 및 수증기/메탄을 분리 계수가 각각 17 및 16 정도의 우수한 선택 투과 성능을 나타냈다. 다공성 금속 지지체의 불균일한 기공에 silica 분체 및 $\gamma-alumina$층을 중간층으로 도입하고, 그 위에 열분해법에 의한 silica를 합성한 결과, Knudsen 확산에 의한 투과 영역의 세공이 완전히 제거되어 높은 수소 및 수증기 선택성을 가지는 복합 막이 형성되었다.

Keywords

References

  1. J. G. Marcano and T. Tsotsis, 'Catalytic Membranes and Membrane Reactors', pp. 15-80, Wiley- VCH, Weinheim, Germany (2002)
  2. H. Ohya, T. Onodera, M. Aihara, and Y. Negishi, 'Characteristics of a zirconia composite membrane fabricated by a laser firing method', J. Membrane Sci., 110, 249 (1996)
  3. J. Fan, H. Ohya, T. Suga, H. Ohashi, K. yamashita, S. Tsuchiya, M. Aihara, T. Takeuchi, and Y. Negishi, 'High flux zirconia composite membrane for hydrogen separation at elevated temperature', J. Membrane Sci., 170, 113 (2000)
  4. Q. XU and M. A. Anderson, 'Solgel route to synthesis of microporous ceramic membranes: preparation and characterization of microporous $TiO_2$ and $ZrO_2$ xerogels', J. Am. Ceram. Soc., 77, 1939 (1994)
  5. Y. S. Lin and A. J. Burggraaf, 'Preparation and characterization of high-temperature thermally stable alumina composite membrane', J. Am. Ceram. Soc., 74, 219 (1991)
  6. C. C. Yu and L. C. Klein, 'Characterization of supported alumina membranes formed by an in situ sol-gel method', J. Am. Ceram. Soc., 78, 3149 (1995)
  7. H. Y. Ha, J. S. Lee, S. W. Nam, I. W. Kim, and S.-A. Hong, 'Alumina composite membranes prepared by MOCVD', J. Mater. Sci. Lett., 16, 1023 (1997)
  8. L.-Q. Wu, P. Huang, N. Xu, and J. Shi, 'Effects of sol properties and calcination on the performance of titania tubular membranes', J. Membrane Sci., 173, 263 (2000) https://doi.org/10.1016/S0376-7388(00)00369-0
  9. R. S. A. de Lange, J. H. A. Hekkink, K. Keizer, and A. J. Burggraaf, 'Formation and characterization of supported microporous ceramic membranes prepared by sol-gel modification techniques', J. Membrane Sci., 99, 57 (1995)
  10. R. S. A. de Lange, K Keizer, and A. J. Burggraaf, 'Analysis and theory of gas transport in microporous sol-gel derived ceramic membranes', J. Membrane Sci., 104, 81 (1995)
  11. N. K Raman and C. J. Brinker, 'Organic Template Approach to Molecular Sieving Silica Membranes', J. Membrane Sci., 105, 273 (1995)
  12. C.- Y. Tsai, S.- Y. Tam, Y. Lu, and C. J. Brinker, 'Dual-layer Asymmetric Microporous Silica Membranes', J. Membrane Sci., 169, 255 (2000)
  13. G. R. Gavalas, C. E. Megiris, and S. W. Nam, 'Deposition of $H_2$-Permselective $SiO_2$ Films', Chemical Eng. Sci., 44, 1829 (1989)
  14. B. Sea, K Kusakabe, and S. Morooka, 'Hydrogen recovery from a $H_2-H_2O-HBr$ mixture utilizing silica-based membranes at elevated temperatures', Ind. Eng. Chem. Res., 37, 2509 (1998)
  15. P.-H. Kang, K-H. Lee, and H.-S. Yang, 'Study on the Preparation of Inorganic Composite Membrane and Characteristics of Gas Separation of Zirconium Modified Polycarbosilane via Pyrolysis', J. Korean Industrial and Engineering Chemistry, 10(8), 1099 (1999)
  16. T. Okui, Y. Saito, T. Okubo, and M. Sadakata, 'Gas permeation of porous organic/inorganic hybrid membranes', J. Sol-Gel Sci. Tech., 5, 127 (1996)
  17. K Kusakabe, Z. Li, H. Maeda, and S. Morooka, 'Preparation of supported composite membrane by pyrolysis of polycarbosilane for gas separation at high temperature', J. Membrane Sci., 103, 175 (1995)
  18. H. B. Park and Y. M. Lee, 'Pyrolytic carbon-silica membrane: a promising membrane materials for improved gas separation', J. Membrane Sci., 213, 263 (2003)
  19. H. B. Park, C. H. lung, Y. K. Kim, S. Y. Nam, S. Y. Lee, and Y. M. Lee, 'Pyrolytic carbon membranes containing silica derived from poly (imide siloxane): the effect of siloxane chain length on gas transport behavior and a study on the separation of mixed gases', J. Membrane Sci., 235, 87 (2004)
  20. K. D. Kim, K. Y. Choi, and J. W. Yang, 'Formation of spherical hollow silica particles from sodium silicate solution by ultrasonic spray pyrolysis method', Colloids & Surfaces A: Physicochem. Eng. Aspects, 254, 193 (2005)
  21. M. D. Blesic, Z. V. Saponjic, J. M. Nedeljkovic, and D. P. Uskokovic, '$TiO_2$ films prepared by ultrasonic spray pyrolysis of nanosize precursor', Materials Letters, 54, 298 (2002)
  22. Y. Matsuzaki, M. Hishinuma, and I. Yasuda, 'Growth of yttria stabilized zirconia thin films by metalloorganic, ultrasonic spray pyrolysis', Thin Solid Films, 340, 72 (1999)
  23. B. Sea, D.-W. Lee, and K-H. Lee, 'Preparation of silica/alumina composite membrane by chemical vapor deposition and sol-gel method', Membrane J., 11, 124 (2001)
  24. K.-H. Lee, B. Sea, M.-Y. Youn, Y.-G. Lee, and D.- W. Lee, 'Preparation of a water selective ceramic membrane on a porous stainless steel support and its application to dehydration membrane reactor', Korean Membrane J., 6, 10 (2004)
  25. D.-W. Lee, S.-E. Nam, B. Sea, S.-K Ihm, and K-H. Lee, 'Synthesis of silica membranes on a porous stainless steel by sol-gel method and effects of preparation conditions on their permselectivity', Bull. Korean Chemical Soc., 25, 1371 (2004)
  26. K.-H. Lee and S.-T. Hwang, 'The transport of condensible vapors through a microporous vycor glass membrane', J. Colloid and Interface Sci., 110, 544 (1986) https://doi.org/10.1016/0021-9797(86)90407-8
  27. R. W. Gemert and F. P. Cuperus, 'Newly developed ceramic membranes for dehydration and separation of organic mixture by pervaporation', J. Membrane Sci., 105, 287 (1995)
  28. E. Piera, M. A. Salomon, J. Coronas, M. Menendez, and J. Santamaria, 'Synthesis, characterization and separation properties of a composite mordenite/ ZSM-5/chabazite hydrophilic membrane', J. Membrane Sci., 149, 99 (1998) https://doi.org/10.1016/S0376-7388(98)00184-7