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Probing the Brønsted Acidity of the External Surface of Faujasite‐Type Zeolites

Abstract : We outline two methodologies to selectively characterize the Brønsted acidity of the external surface of FAU-type zeolites by IR and NMR spectroscopy of adsorbed basic probe molecules. The challenge and goal are to develop reliable and quantitative IR and NMR methodologies to investigate the accessibility of acidic sites in the large pore FAU-type zeolite Y and its mesoporous derivatives often referred to as ultrastable Y (USY). The accessibility of their Brønsted acid sites to probe molecules (n-alkylamines, n-alkylpyridines, n-alkylphosphine-and phenylphosphineoxides) of different molecular sizes is quantitatively monitored either by IR or 31 P NMR spectroscopy. It is now possible, for the first time to quantitatively discriminate between the Brønsted acidity located in the microporosity and on the external surface of large pore zeolites.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-03035164
Contributor : Valentin Valtchev <>
Submitted on : Wednesday, December 2, 2020 - 9:34:44 AM
Last modification on : Friday, December 11, 2020 - 3:31:36 AM

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Louwanda Lakiss, Aurélie Vicente, Jean‐pierre Gilson, Valentin Valtchev, Svetlana Mintova, et al.. Probing the Brønsted Acidity of the External Surface of Faujasite‐Type Zeolites. ChemPhysChem, Wiley-VCH Verlag, 2020, 21 (16), pp.1873-1881. ⟨10.1002/cphc.202000062⟩. ⟨hal-03035164⟩

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