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Experiments for the Undergraduate Laboratory That Illustrate the Size-Exclusion Properties of Zeolite Molecular Sieves

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Jason Cooke and Eric J. Henderson

Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada

J. Chem. Educ., 2009, 86 (5), p 606

DOI: 10.1021/ed086p606

Publication Date (Web): May 1, 2009

Section:

History, Education, and Documentation

Abstract

Experiments are presented that demonstrate the size-exclusion properties of zeolites and reveal the reason for naming zeolites "molecular sieves". If an IR spectrometer is available, the adsorption or exclusion of alcohols of varying sizes from dichloromethane or chloroform solutions can be readily demonstrated by monitoring changes in the intensity of the alcohol OH band in the IR spectra. It is also possible to qualitatively illustrate whether solvents of varying sizes are able to enter the pores of different zeolites by observing the displacement of adsorbed nitrogen gas from within the pores. The volume of evolved gas is considerable and can be measured if desired.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Inorganic Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Alcohols

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This article has been cited by 5 ACS Journal articles (5 most recent appear below).

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Molecular Models Illustrating Properties of Zeolites. Linde-Type Zeolite A, Selection of Alcohols, and Diphenylmethanol Etherification Product
William F. Coleman
Journal of Chemical Education2009 86 (5), 656
- Molecular Models Illustrating Properties of Zeolites. Linde-Type Zeolite A, Selection of Alcohols, and Diphenylmethanol Etherification Product
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  These Jmol models of Linde-Type zeolite A with small molecules in its channels illustrate the use of zeolites as molecular sieves.
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Zeolite 5A Catalyzed Etherification of Diphenylmethanol
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Journal of Chemical Education2009 86 (5), 610
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