Abstract
The combination of thermogravimetry, microcalorimetry and infrared spectroscopy studies of pyridine adsorption has been used to characterize the acidity of a ZSM-5 catalyst. The majority of the acid sites are Brønsted acid centers associated with framework Al species, with heats of pyridine adsorption equal to 140 kJ/mol. Non-framework Al species in the zeolite sample of this study eliminate an approximately equal number of Brønsted acid sites. These nonframework Al species also produce strong Lewis acid sites with pyridine adsorption heats greater than 140 kJ/mol, as well as weak adsorption sites (e.g., weak Bransted acid sites or hydrogen bonding sites) with heats equal to 90–140 kJ/mol.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. Deeba and W.K. Hall, Z. Phys. Chem. NF 144 (1985) 85.
J.E. Benson, K. Ushira and M. Boudart, J. Catal. 9 (1967) 91.
N. Cardona-Martinez and J.A. Dumesic, J. Catal. 125 (1990) 427.
E. Robens, Vac. Microbal. Techn. 8 (1971) 73.
J.A. Poulis, B. Pelupessy, C.H. Massen and J.M. Thomas, J. Sci. Instr. 41 (1964) 295.
A. Auroux, V. Bolis, P. Wierzchowski, P.C. Gravelle and J.C. Vedrine, J. Chem. Soc. Faraday Trans. I 75 (1978) 2544.
J. Datka and E. Tuznik, J. Catal. 102 (1986) 43.
A. Jentys, G. Warecka and J.A. Lercher, J. Mol. Catal. 51 (1989) 309.
R. Borade, A. Sayari, A. Adnot and S. Kaliaguine, J. Phys. Chem. 94 (1990) 5989.
N. Topsøe, K. Pedersen and E.G. Derouane, J. Catal. 70 (1981) 41.
S. Beran, P. Jiru and B. Wichterlova, J. Phys. Chem. 85 (1981) 1951.
C. Miridatos and C. Barthomeuf, J. Chem. Soc. Chem. Commun. (1981) 39.
A.G. Ashton, S. Batmanian, D.M. Clark, J. Dwyer, F.R. Fitch, A. Hinchcliffe and F.J. Machado, in:Catalysis by Acids and Bases, ed. B. Imelik (Elsevier, Amsterdam, 1985) p. 101.
R.D. Shannon, R.H. Staley, A.J. Vega, R.X. Fischer, W.H. Baur and A. Auroux, J. Phys. Chem. 93 (1989) 2019.
R.B. Borade and A. Clearfield, J. Phys. Chem. 96 (1992) 6729.
D.T. Chen, S.B. Sharma, I. Filimonov and J.A. Dumesic, Catal. Lett. 12 (1992) 201.
B.E. Spiewak, M.R. Gonzalez, S.B. Sharma and J.A. Dumesic, to be submitted.
J.C. Vedrine, A. Auroux, V. Bolis, P. Dejaifve, C. Naccache, P. Wierzchowski, E.G. Derouane, J.B. Nagy, J.P. Gilson, J.H.C. van Hooff, J.P. van den Berg and J. Wolthuizen, J. Catal. 59 (1979) 248.
J. Vedrine, A. Auroux and G. Coudurier, in:Catalytic Materials: Relationship Between Structure and Reactivity, eds. T.J. Whyte, R. Dalla Betta, E. Derouane and R. Baker (American Chemical Society, Washington, 1984) p. 253.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gonzalez, M.R., Sharma, S.B., Chen, D.T. et al. Thermogravimetric and microcalorimetric studies of ZSM-5 acidity. Catal Lett 18, 183–192 (1993). https://doi.org/10.1007/BF00769437
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00769437