Influence of ion exchange and calcination on pore size and thermal stability of MCM-41 with different Si/Al ratios

Abstract

A decrease in pore size and increase in thermal stability of three different MCM-41 materials with Si/Al ratios of 18.6, 17.3 and 3.1, due to ammonia ion exchange and following calcination at 540°C, has been observed by N₂ sorption measurements, differential thermal analysis (DTA) and X-ray diffraction (XRD). An explanation based on recrystallization at the pore mouth is proposed and the influence of the alumina content of the materials is discussed.

References

1. 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. McCullen, J. B. Higgins and J. L. Schlenker, J. Am. Chem. Soc., 1992, 114, 10834.
2. C. T. Kresge, M. E. Leonowicz, W. J. Roth, J. C. Vartuli and J. S. Beck, Nature (London), 1992, 359, 710.
3. R. Schmidt, E. W. Hansen, M. Stöcker, D. Akporiaye and O. H. Ellestad, J. Am. Chem. Soc., 1995, 117, 4049.
4. A. Corma, Chem. Rev., 1995, 95, 559.
5. C.-Y. Chen, H.-X. Li and M. E. Davis, Microporous Mater., 1993, 2, 17.
6. A. Liepold, K. Roos, W. Reschetilowski, A. P. Esculcas, J. Rocha, A. Phillipou and M. W. Anderson, J. Chem. Soc., Faraday Trans., 1996, 92, 4623.
7. Z. Luan, C.-F. Cheng, W. Zhou and J. Klinowski, J. Phys. Chem., 1995, 99, 1018.
8. V. Alfredson, M. Keung, A. Monnier, G. D. Stucky, K. K. Unger and F. Schüth, J. Chem. Soc., Chem. Commun., 1994, 921.
9. E. W. Hansen, R. Schmidt, M. Stöcker and D. Akporiaye, J. Phys. Chem., 1995, 99, 4148.
10. K. R. Kloetstra and H. van Bekkum, J. Chem. Soc., Chem. Commun., 1995, 1005.
11. N. Coustel, F. Di Renzo and F. Fajula, J. Chem. Soc., Chem. Commun., 1994, 967.
12. A. Corma, V. Fornes, M. T. Navarro and J. Pertz-Pariente, J. Catal., 1994, 148, 569.
13. A. Corma, V. Gonzalez-Alfaro and A. V. Orchilles, Appl. Catal., 1995, 129, 203.
14. K. Roos, A. Liepold and W. Reschetilowski, Erdöl Erdgas Kohle, 1997, 113, 88.
15. K. Roos, A. Liepold, W. Reschetilowski, R. Schmidt, A. Karlsson and M. Stöcker, Stud. Surf. Sci. Catal., 1995, 94, 389.
16. W. Reschetilowski, K. Roos, A. Liepold, M. Stöcker, R. Schmidt, A. Karlsson, D. Akporiaye and E. Myhrvold, Stud. Surf. Sci. Catal., 1995, 98, 180.
17. E. Vogt, Chem. Mag., 1995, 12, 629.
18. A. Liepold, K. Roos and W. Reschetilowski, Chem. Eng. Sci., 1996, 51, 3007.
19. K. Roos, A. Liepold, H. Koch and W. Reschetilowski, Chem. Eng. Technol., 1997, 20, 326.
20. R. Schmidt, D. Akporiaye, M. Stöcker and O. H. Ellestad, Stud. Surf. Sci. Catal., 1994, 84, 61.
21. S. Brunauer, P. H. Emmet and E. Teller, J. Am. Chem. Soc., 1938, 60, 309.
22. E. P. Barrett, L. G. Joyner and P. P. Halenda, J. Am. Chem. Soc., 1951, 73, 373.
23. D. Dollimore and G. R. Heal, Trans. Faraday Soc., 1963, 59, 2386.
24. D. W. Breck, Zeolite Molecular Sieves, Robert E. Krieger Company, New York, 1974, p. 441.