Diffuse Reflectance IR Study of Molecular Hydrogen and Deuterium Adsorbed at 77 
K on NaA Zeolite Part 2. Overtone, Combination and Vibration-Rotational Modes 
and Thermodesorption from NaA Zeolite

Kazansky, V. B.; Borovkov, V. Yu.; Karge, Hellmut G.

doi:10.1524/zpch.1999.211.Part_1.001

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Diffuse Reflectance IR Study of Molecular Hydrogen and Deuterium Adsorbed at 77 K on NaA Zeolite Part 2. Overtone, Combination and Vibration-Rotational Modes and Thermodesorption from NaA Zeolite

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Karge, Hellmut G.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Kazansky, V. B., Borovkov, V. Y., & Karge, H. G. (1999). Diffuse Reflectance IR Study of Molecular Hydrogen and Deuterium Adsorbed at 77 K on NaA Zeolite Part 2. Overtone, Combination and Vibration-Rotational Modes and Thermodesorption from NaA Zeolite. Zeitschrift für Physikalische Chemie, 211(1), 1-12. doi:10.1524/zpch.1999.211.Part_1.001.

Cite as: https://hdl.handle.net/21.11116/0000-0006-0880-0

Abstract

The DRIFT spectra of NaA zeolite loaded with hydrogen or deuterium at 77 were investigated by Fourier transform IR spectroscopy in the ranges of fundamental stretching, combination, overtone of stretching and vibration-rotational modes. Concomitantly in situ thermodesorption (TD) of the probe molecules was carried out in the temperature interval of 77
—
200 K. Combination of DRIFT and TD measurements provided a better resolution of the spectra and facilitated their assignment and interpretation. Thus, the existence of two types of hydrogen or deuterium adsorption could be confirmed, viz. of a more strongly adsorbed form held by sodium cations in the eight-membered windows and a more weakly adsorbed one attached to the sodium cations residing in the sixmembered windows of the structure.