Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 49: Issue 1
Adsorption of water on zeolites of different types
Authors:
B. Hunger Institute of Physical and Theoretical Chemistry, University of Leipzig, D-04103 Leipzig, Germany

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S. Matysik Institute of Physical and Theoretical Chemistry, University of Leipzig, D-04103 Leipzig, Germany

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M. Heuchel Institute of Physical and Theoretical Chemistry, University of Leipzig, D-04103 Leipzig, Germany

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E. Geidel Institute of Physical Chemistry, University of Hamburg, D-20146 Hamburg, Germany

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H. Toufar Centrum voor Oppervlaktechemie en Katalyse, Katholieke Universiteit Leuven, B-3001 Leuven (Heverlee), Belgium

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Pages:
553–565
Online Publication Date:
03 Aug 2005
Publication Date:
01 Jul 1997
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf01987483
Keywords:
desorption energy distributions; EEM calculations; far-infrared spectroscopy; Na+-ion exchanged zeolites of different types; temperature-programmed desorption (TPD); water adsorption
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Abstract  

We have investigated the interaction of water with Na+-ion exchanged zeolites of different structures (LTA, FAU, ERI, MOR and MFI) by means of temperature-programmed desorption (TPD). The non-isothermal desorption of water shows, depending on the zeolite type, differently structured desorption profiles. In every case the profiles have, however, two main ranges. Using a regularization method, desorption energy distribution functions have been calculated. The desorption energy distributions between 42–60 kJ mol−1, which can be attributed to a non-specific interaction of water, show two clearly distinguished energy ranges. The water desorption behaviour of this range correlates with the electronegativity of the zeolites and the average charge of the lattice oxygen atoms calculated by means of the electronegativity equalization method (EEM). The part of the desorption energy distributions in the range of 60–90 kJ mol−1, reflecting interactions of water with Na+ cations, shows two more or less pronounced maxima. In agreement with vibrational spectroscopic studies in the far infrared region, it may be concluded that all samples under study possess at least two different cation sites.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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