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Microcalorimetric studies of ammonia adsorption on γ-Al2O3, HNa-Y zeolite, and H-mordenite

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Abstract

The acidities ofγ-Al2O3, HNa-Y zeolite, and H-mordenite have been examined by microcalorimetric measurements of ammonia adsorption at 423 K. The differential heat of adsorption on γ-Al2O3 decreases continuously with ammonia coverage from an initial value of 165 kJ/ mol at low coverages to a value of 70 kJ/mol at higher coverages. The differential heat of adsorption on HNa-Y zeolite shows similar behavior, with a plateau of nearly constant heat at 115 kJ/mol. H-mordenite exhibits a nearly constant heat of adsorption equal to 155 kJ/mol. The results from these microcalorimetric measurements are in agreement with thermogravimetric and temperature-programmed desorption results collected at higher temperatures. Adsorbed ammonia has sufficient mobility at 423 K to equilibrate with the catalyst surface on the time scale of microcalorimetric measurements, and these measurements provide an effective method for quantifying acid site distributions of solid-acid catalysts.

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Authors and Affiliations

  1. Department of Chemical Engineering, University of Wisconsin-Madison, 53706, Madison, Wl, USA

    Brian E. Spiewak, Brent E. Handy, Sanjay B. Sharma & J. A. Dumesic

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  1. Brian E. Spiewak
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  2. Brent E. Handy
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  3. Sanjay B. Sharma
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  4. J. A. Dumesic
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Spiewak, B.E., Handy, B.E., Sharma, S.B. et al. Microcalorimetric studies of ammonia adsorption on γ-Al2O3, HNa-Y zeolite, and H-mordenite. Catal Lett 23, 207–213 (1994). https://doi.org/10.1007/BF00811355

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  • DOI: https://doi.org/10.1007/BF00811355

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