Herman A. Szymanski, Dennis N. Stamires, and Gregory R. Lynch, "Infrared Spectra of Water Sorbed on Synthetic Zeolites*," J. Opt. Soc. Am. 50, 1323-1328 (1960)
The infrared spectra of water sorbed on several synthetic zeolites is discussed in terms of the molecular species present. Three different sets of bands are observed for water as the water content on the zeolite is varied. Evidence for surface OH groups for synthetic zeolites is presented. A technique for reducing the scattered light of zeolite powders by wetting them is suggested. It is possible to study surface OH groups by this technique using D2O as the wetting agent. A mechanism whereby surface OH groups can form in sodium and ammonium zeolites is given. The results obtained for water sorbed on sodium zeolites differs to some extent from those reported previously.
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Infrared frequencies for water sorbed on NaX synthetic zeolite. All samples were in pellet form and rechecked in powder form. Spectra were taken at the temperature indicated.
Infrared frequencies for water sorbed on NH4X zeolites. All samples were in pellet form and rechecked in powder form. Pressure was maintained constant at 0.03 mm Hg. Spectra were taken at the activation temperature except where indicated.
These three samples were activated at these temperatures, but spectra were run at room temperature.
NH4+ also shows a band here.
Table III
Infrared frequencies for NaX, NH4X, and NaA zeolites. All samples were activated at the temperatures listed for several hours and then run at room temperature in Nujol mull.
No peaks are reported for the ammonium ion at 1380, due to interference by Nujol mull bands.
The frequency here differs slightly from those measured in the powder form at high temperature. This is probably due to some H2O being picked up in cooling to room temperature.
Table IV
Infrared frequencies of deuterium oxide sorbed on NaX and NH4X zeolites. Samples were run as powders and in Nujol mull.
Infrared frequencies for water sorbed on NaX synthetic zeolite. All samples were in pellet form and rechecked in powder form. Spectra were taken at the temperature indicated.
Infrared frequencies for water sorbed on NH4X zeolites. All samples were in pellet form and rechecked in powder form. Pressure was maintained constant at 0.03 mm Hg. Spectra were taken at the activation temperature except where indicated.
These three samples were activated at these temperatures, but spectra were run at room temperature.
NH4+ also shows a band here.
Table III
Infrared frequencies for NaX, NH4X, and NaA zeolites. All samples were activated at the temperatures listed for several hours and then run at room temperature in Nujol mull.
No peaks are reported for the ammonium ion at 1380, due to interference by Nujol mull bands.
The frequency here differs slightly from those measured in the powder form at high temperature. This is probably due to some H2O being picked up in cooling to room temperature.
Table IV
Infrared frequencies of deuterium oxide sorbed on NaX and NH4X zeolites. Samples were run as powders and in Nujol mull.
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