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A comparative study of the acidity of various zeolites using the differential heats of ammonia adsorption as measured by high-vacuum microcalorimetry

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Karge,  Hellmut G.
Fritz Haber Institute, Max Planck Society;

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Jozefowicz,  Linda C.
Fritz Haber Institute, Max Planck Society;

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Citation

Karge, H. G., & Jozefowicz, L. C. (1994). A comparative study of the acidity of various zeolites using the differential heats of ammonia adsorption as measured by high-vacuum microcalorimetry. In J. Weitkamp, H. Karge, H. Pfeifer, & W. Hölderich (Eds.), Zeolites and Related Microporous Materials: State of the Art 1994 - Proceedings of the 10th International Zeolite Conference, Garmisch-Partenkirchen, Germany, 17-22 July 1994 (pp. 685-692). Amsterdam: Elsevier.


Cite as: https://hdl.handle.net/21.11116/0000-0009-8E73-6
Abstract
The differential heats of ammonia adsorption onto activated H-ZSM-5, H-Y, Na,La-Y and Na,La-X were measured under stable, static vacuum conditions at an adsorption temperature of 425 K. Temperature-programmed desorption(TPD) of ammonia adsorbed a t 425 K and in-situ infrared spectroscopy employing pyridine as a probe for acidic sites were also used to investigate the acidity of these zeolites. The number and strength of the acidic sites of these zeolites can be partially differentiated by microcalorimetry, but a combination of all of the above-mentioned techniques is necessary for a complete characterisation of their acidic nature.