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Issue 2, 1998
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Use of but-1-yne as a probe for the characterization of the basicity of alkali-exchanged zeolites

Abstract

But-1-yne has been adsorbed at room temperature on a series of LiNa, Na and CsNaX and Y zeolites and also on CsNaX,9Cs and CsNaY,9Cs samples containing nine Cs atoms occluded by a unit cell. An IR study of the 3000–2800 cm−1 frequency range clearly showed that but-1-yne isomerized into but-2-yne on CsNaX,9Cs whereas the observation of a band near 1950 cm−1 in the case of CsNaY,9Cs characterized the formation of buta-1,2-diene. Such partial transformation of but-1-yne to isomers did not occur on LiNa and Na samples, allowing one to study the basicity of such zeolites from the ν([triple bond, length as m-dash]CH) shift which decreases in the following order: NaX > LiNaX > NaY > LiNaY. The main feature is the observation of at least two perturbed ν([triple bond, length as m-dash]CH) bands for the NaX and NaY samples, revealing the heterogeneity of the basic sites. This result is discussed taking into account the presence of cations in different positions.

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Article type: Paper
DOI: 10.1039/A705221I
Citation: J. Chem. Soc., Faraday Trans., 1998,94, 331-335
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    Use of but-1-yne as a probe for the characterization of the basicity of alkali-exchanged zeolites

    J. Lavalley, J. Lamotte, A. Travert, J. Czyzniewska and M. Ziolek, J. Chem. Soc., Faraday Trans., 1998, 94, 331
    DOI: 10.1039/A705221I

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