Abstract
The acidity of mesoporous materials FeSiMCM-41, LaSiMCM-41, SiMCM-41, AlSiMCM-41 and HAlSiMCM-41 has been investigated by microcalorimetric studies of the adsorption of ammonia and temperature programmed ammonia desorption method. In the initial stage, the acid strength sequence is SiMCM-41>HAlSiMCM-41>AlSiMCM-41>FeSiMCM-41>LaSiMCM-41, in agreement with that found for microporous molecular sieves materials. A small number of strong acid sites of SiMCM-41 may result from the aluminum impurity contained in the silica source material. The acid density sequence is HAlSiMCM-41>AlSiMCM-41>FeSiMCM-41>LaSiMCM-41≥SiMCM-41 and can be explained by the studies of existing states of trivalent atoms in these samples reported in previous work. Since some NH3-TPD plots of these samples show the profiles that could not be back to baseline at elevated temperature, the technique of microcalorimetric adsorption is preferable in studying these samples.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. T. Kresge, M. E. Leonowicz, W. J. Roth, J. C. Vartili and J. S. Beck, Nature, 359 (1992) 710.
G. D. Stucky, Q. Huo, A. Firouzi, B. F. Chmelka, S. Schacht, I. G. Voigt-Martin and F. Schath, Stud. Surf. Sci. Catal., 105 (1997) 3.
J. Aguado, D. P. Serrano, M. D. Romero and J. M. Escola, J. Chem. Soc. Chem. Commun., 1996, p. 725.
P. L. Llewellyn, U. Ciesla, H. Decher, R. Stadler, F. Schuth and K. K. Unger, Stud. Surf. Sci. Catal., 84 (1994) 2013.
A. Corma, M. T. Navarro, J. Perez-Parieute and F. Sanchez, Stud. Surf. Sci. Catal., 84 (1994) 69.
P. T. Tanev, M. Chibwe and T. J. Pinnavaia, Nature, 368 (1994) 321.
A. Corma, M. T. Navarro and J. P. Pariente, J. Chem. Soc. Chem. Commun., (1994) 147.
T. Kr. Das, K. Chaudhari, A. J. Chandwadkar and S. Sivasanker, J. Chem. Soc. Chem. Commun., (1995) 2495.
N. Ulagappan and C. N. R. Rao, J. Chem. Soc. Chem. Commun., (1996) 1074.
K. M. Reddy, I. Moudrakovski and A. Sayari, J. Chem. Soc. Chem. Commun., (1994) 1059.
M. Hartmann, A. Poppl and L. Kevan, J. Phys. Chem., 100 (1996) 9906.
G. Bellussi, C. Perego, A. Carati, S. Peratello E. P. Massara and G. Perego, Stud. Surf. Sci. Catal., 84 (1994) 85.
N.-Y. He, B.-S. Bao and Q.-H. Xu, Stud. Surf. Sci. Catal., 105 (1997) 85.
B. E. Handy, S. B. Sharma, B. E. Spiewak and J. A. Dumesic, Meas. Sci. Technol., 4 (1993) 1350.
R. Szostak, V. Nair and T. L. Thomas, J. Chem. Soc. Farady Trans. I., (1987) 487.
P. Ratnasamy and R. Kumar, Catal. Today, 9 (1991) 329.
R. Schmidt, D. Akporiaye, M. Stocker and O. H. Ellestad, Stud. Surf. Sci. Catal., 84 (1994) 61.
J. S. Beck, J. C. Vartuli, W. J. Roth, M. E. Leonowicz, C. T. Kresge, K. D. Schmitt, C. T.-U. Chu, D. H. Olson, E. W. Sheppard, S. B. McCullen, J. B. Higgins and J. L. Schlenker, J. Am. Chem. Soc., 114 (1992) 10834.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
He, N., Li, D., Tu, M. et al. Studies of Acid Properties of FeSiMCM-41 and LaSiMCM-41 by NH3-microcalorimetric and NH3-TPD Measurements. Journal of Thermal Analysis and Calorimetry 58, 455–462 (1999). https://doi.org/10.1023/A:1010175810571
Issue Date:
DOI: https://doi.org/10.1023/A:1010175810571