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FTIR spectroscopic and1 H MAS NMR studies of the influence of lattice chemistry and structure on Brønsted acidity in zeolites

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Abstract

The influence of the Si/Al ratio, of the nature of the T-atom and of the pore size on the acidic strength of Brønsted sites in zeolites has been investigated using changes of the vibrational properties of Brønsted OH(OD) groups and a shift change of Brønsted protons in nuclear magnetic resonance upon adsorption of weak bases. Deuterated acetonitrile and trichloro-acetonitrile have been chosen to probe the acidic strengths of ZSM-5, FeZSM-5, mordenite and zeolite Y, which are often used as catalysts. From the results of the FTIR and 1 H MAS NMR studies it can be concluded that the chemical composition of the lattice dominates the acidic strength of the Brønsted sites in zeolites. Differences in structure or pore size play a much smaller role.

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Author notes

  1. J. Jänchen

    Present address: Adlershofer Umweltschutztechnik- und Forschungsgesellschaft mbH, Rudower Chaussee 5, Haus 2.3, 12484, Berlin, Germany

Authors and Affiliations

  1. Schuit Institute of Catalysis, Eindhoven University of Technology, PO Box S13, 5600, MB Eindhoven, The Netherlands

    J. Jänchen, J. H. M. C. van Wolput, L. J. M. van de Ven, J. W. de Haan & R. A. van Santen

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  1. J. Jänchen
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  2. J. H. M. C. van Wolput
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  3. L. J. M. van de Ven
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  4. J. W. de Haan
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Jänchen, J., van Wolput, J.H.M.C., van de Ven, L.J.M. et al. FTIR spectroscopic and1 H MAS NMR studies of the influence of lattice chemistry and structure on Brønsted acidity in zeolites. Catal Lett 39, 147–152 (1996). https://doi.org/10.1007/BF00805574

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  • DOI: https://doi.org/10.1007/BF00805574

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