Realumination of dealuminated HZSM-5 zeolites by acid treatment

Abstract

²⁷Al MAS NMR and FTIR spectroscopy shows that part of non-framework aluminiums in dealuminated HZSM-5 zeolites are reinserted into the framework upon treatment with aqueous hydrochloric acid.

References

1. T. Sano, N. Yamashita, Y. Iwami, K. Takeda and Y. Kawakami, Zeolites, 1996, 16, 258.
2. K. Takeda, T. Sano and Y. Kawakami, Nippon Kagaku Kaishi, 1996, 680.
3. T. Sano, H. Ikeya, T. Kasuno, Z. B. Wang, Y. Kawakami and K. Soga, Zeolites, in the press.
4. D. W. Breck and G. W. Skeels, Proc. 5th Int. Conf. on Zeolites, ed. L. V. C. Rees and B. E. Heyden, London, 1980, p. 335.
5. X. Lin, J. Klinowski and J. M. Thomas, J. Chem. Soc., Chem. Commun., 1986, 582.
6. H. Hamdan, B. Sulikowski and J. Klinowski, J. Phys. Chem., 1989, 93, 350.
7. Z. Zhang, X. Liu, Y. Xu and R. Xu, Zeolites, 1991, 11, 232.
8. H. Ishida and Y. Fukuoka, Nippon Kagaku Kaishi, 1994, 690.
9. D. Lin, S. Bao and Q. Xu, Zeolites, 1997, 18, 162.
10. N. Y. Chen, J. Phys. Chem., 1976, 80, 60.
11. D. H. Olson, W. O. Haag and R. M. Lao, J. Catal., 1980, 61, 390.
12. G. Engelhardt and U. Lohse, J. Catal., 1984, 88, 513.
13. L. Aouali, J. Jeanjean, A. Dereign, P. Tougne and D. Delafosse, Zeolites, 1988, 8, 517.
14. P. J. Kooyman, P. van der Waal and H. van Bekkum, Zeolites, 1997, 18, 50.
15. E. Loeffler, U. Lohse, Ch. Peuker, G. Oehlmann, L. M. Kustov, V. L. Zholobenko and V. B. Kazansky, Zeolites, 1990, 10, 266.