Catalysis Letters

, Volume 120, Issue 1–2, pp 154–160 | Cite as

Characterization of Acidity and Porosity of Zeolite Catalysts by the Equilibrated Thermodesorption of n-Hexane and n-Nonane

  • Wacław MakowskiEmail author
  • Barbara Gil
  • Dorota Majda


Thermodesorption of n-hexane and n-nonane from the acidic and non-acidic zeolites ZSM-5 and Y was studied by means of the thermogravimetric temperature programmed equilibrated desorption (TPED) and quasi-equilibrated temperature programmed desorption and adsorption (QE-TPDA). Micropore volumes determined from the adsorption capacity of n-hexane were close to those determined by N2 adsorption. Content and strength of acid sites in the acidic zeolites estimated by fitting the Arrhenius equation to the high temperature parts of QE-TPDA profiles of n-hexane attributed to its cracking were in agreement with their acidity characteristics obtained by IR spectroscopy of chemisorbed pyridine. The mesopore volume was determined from the QE-TPDA profiles of n-nonane. Coking observed only for QE-TPDA of n-nonane on H-USY zeolite resulted in blocking the micropores without affecting the mesopores.


Thermodesorption Zeolites n-Hexane n-Nonane Pore volume Acidity 



This work has been supported by the Ministry of Science and Higher Education of Poland with a grant number N507 108 32/3175


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Faculty of Chemistry Jagiellonian University KrakowPoland
  2. 2.Regional Laboratory for Physicochemical Analyses and Structural Research Jagiellonian University KrakowPoland

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