Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지

The Effect of Initial pH on the Synthesis of Mesoporous Molecular Sieve, MCM-41

MCM-41 분자체의 합성에 초기 pH가 미치는 영향

  • Kim, Wha-Jung (Dept. of Industrial Chemistry, College of Engineering., Kon Kuk University) ;
  • Yoo, Jae-Churl (Dept. of Industrial Chemistry, College of Engineering., Kon Kuk University)
  • 김화중 (건국대학교 공과대학 공업화학과) ;
  • 유재철 (건국대학교 공과대학 공업화학과)
  • Received : 1997.02.03
  • Accepted : 1997.04.24
  • Published : 1997.06.10
Download PDF
⟨ Previous Next ⟩

Abstract

A mesoporous molecular sieve, MCM-41, was synthesized and the effent of various initial pH of reaction mixtures on the synthesis and physical properties of MCM-41 was investigated. Adjustment of initial pH for reaction mixtures was made before starting hydrothermal reaction rather than during the reaction. Highly crystalline MCM-41 which shows pore diameters of $30{\AA}$ to $40{\AA}$ and specific surface areas greater than $1000m^2/g$ has been successfully prepared through a single adjustment of initial pH. Results also suggest that the initial pH adjustment has a significant effect on the formation of MCM-41 with a long-range ordered hexagonal array and an excellent thermal stability. Finally, it is speculated that the adjustment of initial pH might accelerate the dissolution of stable polymeric sodium silicate to highly reactive monomeric sodium silicate resulting in well-ordered MCM-41.

Mesoporous 분자체인 MCM-41의 합성시, 수열 반응 전에 실시되는 반응용액의 초기 pH 조절이 MCM-41의 합성 및 특성에 미치는 영향에 관하여 연구하였다. 반응중간에 추가적인 pH의 조절없이, 초기 반응용액에 대한 1회의 pH 조절을 통하여 $30{\AA}$에서 $40{\AA}$에 이르는 기공 크기 및 $1000m^2/g$ 이상의 높은 비표면적을 갖는 MCM-41 분자체를 합성할 수 있었다. 그 결과, pH 조절은 실리카원으로 사용되는 polymeric $Na^+-silicate$로부터 반응성이 높은 monomeric $Na^+-silicate$를 원활하게 공급되도록 하여 우수한 열적 안정성을 나타내며 hexagonal 구조가 발달된 MCM-41의 명성에 큰 영향을 미친다는 것을 확인할 수 있었다.

Keywords

Acknowledgement

Supported by : 건국대학교

References

  1. Pure Appl. Chem. v.31 IUPAC Manual of Symbols and Termunology, Appendix 2, Part 1, colloid and Surface Chemistry
  2. Chem. Eng. Process v.32 Industrial catalytic application of zeolites N. Y. Chen;T. F. Degnan
  3. Ing. Eng. Chem. Process. Design Dev. v.10 V. W. Jr. Weekman;S. E. Voltz;D. M. Nace
  4. Catal. Rev. Sci. Eng. v.28 Intustrial application of shape selective catalysis N. Y. Chen;W. E. Garwood
  5. Chen. Eng. v.5 F. G. Dwyer;F. J. Lewis;F. H. Schneider
  6. Zeolites v.10 R. M. Dessau;J. L. Schlenker;J. B. Higgins
  7. Studies in surface science and catalysis v.58 Introduction to zeolite science and practice H. V. Bekkum;E. M. Flanigen;J. C. Jansen
  8. Nature v.331 M. E. Davis;C. Saldarriage;C. Montes;C. Garces;C. Crowder
  9. Studies in surface science and catalysis v.58 ntrodction to zeolite science and practice H. V. Bekkum;E. M. Flanigen;J. C. Jansen
  10. Nature v.352 M. Eastermann;L. B. Mc Custer;C. Baerlocher;A. Merrouche;H. Kessler
  11. Molecular Sieves Principles of Synthesis and Identification R. Szostak
  12. Proceeding of the 5th International Conference on Zeolites D. E. W. Vaughan;R. J. Lussier;L. V. C. Rees(ed.)
  13. Studies in Surface Science & Catalysis v.28 W. M. Neier;Y. Murakami(ed.);A. Iijima(ed.)J. W. Ward(ed.)
  14. ACS Symp. Ser. v.368 D. E. W. Vaughan
  15. J. Am. Chem. Soc. v.113 M. E. Landis;B. A. Aufdembrink;P. Chu;I. D. Johnson;G. W. Kirker;M. K. Rubin
  16. Nature v.359 C. T. Kresge;M. E. Leonowicz;W. J. Roth;J. Vartuli;J. S. Beck
  17. J. Am. Chem. Soc. v.114 J. S. Beck;J. C. Vartuli;W. J. Roth;M. E. Leonowicz;C. T. Kresge;K. D. Schmitt;C. T-W. Chu;D. H. Olson;E. W. Sheppard;S. B. McCulled;J. B. Higgins;J. L. Schlenker
  18. J. Am. Chem. Soc. v.113 M. E. Landis(et. al.)
  19. Bull. Chem. Soc. Jpn. v.63 T. Yanagisawa;T. Shimizu;K. Kazuyuki;C. Kato
  20. U.S. Patent No.5,098,684(1992), U.S. Patent No. 5,102,643(1992) C. T. Kresge;M. E. Leonowicz;w. J. Roth;J. C. Vartuli
  21. Nature v.368 Q. Huo;D. L. Margolese;U. Cielsa;P. Feng;T. E. Gier;P. Sieger;R. Leon;P. M. Petroff;F. Schuth;G. D. Stucky
  22. Chem. Mater. v.6 Q. Huo;D. L. Margolese;U. Cielsa;D. G. Demuth;P. Feng;T. E. Gier;A. Sieger;B. F. Firouzi;B. F. Chmelka;F. Schuth;G. D. Stucky
  23. Microporous Mater. v.2 C. Y. Chen;H. X. Li;M. E. Davis
  24. J. Chem. Soc. Chem. Commum. A. Steel;S. W. Carr;M. W. Anderson
  25. State of the Art 1994, Studies in Suface Science and Catalysis v.84 Zeolites and Related Microporous Materials J. C. Vartuli;K. D. Schmidt;C. T. Kresge;W. J. Roth;M. Leonowicz;S. B. McCullen;S. D. Hellring;J. S. Beck;J. L. Schlenker;D. H. Olson;D. H.;E. W. Sheppard;Weitkamp, J.(ed.);Karge, H. G.(ed.);Pfeifer, J.(ed.);Holderich, W.(ed.)
  26. Science v.261 A. Monnier;F. Schuth;Q. Huo;D. Kumar;D. Margolese;R. S. Maxwell;C. D. Stucky;M. Krishnamurty;P. M. Petroff;A. Firouzi;M. Janike;B. F. Chmelka
  27. Ind. Eng. Chem. v.35 Advances in Mesoporous Sieve MCM-41. Xiu, S.;Zhao, G.;Q.(Max) Lu;G. J. Millar
  28. J. Chem. Soc., Chem. Commum. R. Ryoo;J. M. Kim
  29. 11rh International Zeolite Conference (IZC) R. Ryoo;J. M. Kim;C. H. Shin;J. Y. Lee
  30. Zeolites and Related Microporous Materials : State of the Art 1994, Studies in Surface Science and Catalysis v.84 Ralf Schmidt;Duncan Akporiaye;Michael Stocker;Ole Henrik Ellestad;J. Weitkamp(ed.);H. G. Karge(ed.);J. Pfeifer(ed.);W. Holderich(ed.)