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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 43,
  • Issue 8,
  • pp. 1370-1374
  • (1989)

Perturbation of Surface Species on Zeolite HY by Xe Observed by FT-IR Spectroscopy

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Abstract

The perturbation of surface species of zeolite HY by Xe has been studied with the use of <i>in situ</i> FT-IR spectroscopy. The Brönsted acid sites, characterized by a band at 3638 cm<sup>−1</sup>, are located in the zeolite super-cages, as suggested previously, while Brönsted acid sites attributed to a 3545-cm<sup>−1</sup> band are located in the small zeolite cages and are inaccessible to the Xe molecules. The Brönsted acid sites in the supercages are found to have a weaker acidity than those in the small cages. The data also indicate that pyridine molecules are more strongly bonded to the super-cage Brönsted acid sites than are the NH<sub>3</sub> molecules. This work is an example of the usefulness of liquid-nitrogen-temperature FT-IR techniques, coupled with multiple-scan data acquisition methods, for studying weak interactions between Xe and zeolite surface species in detail. This work also shows how FT-IR spectroscopy can complement Xe-129 NMR spectroscopy in studies of the nature of zeolite surface species using Xe as a probe molecule.

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