Abstract
The influence of the pelletizing pressure on the frequency of the O-H stretching vibration at 3640 cm −1 has been studied up to 7000 kp/cm 2 for CaY and NH 4-Y zeolites by means of internal reflection and transmission techniques. No influence of the pressure was observed concerning the frequency of the O-H stretching vibration. The comparison of internal reflection with transmission spectra of X and Y zeolite powders containing Na +, NH 4 4 or Ca 2+ cations revealed no difference in the frequency of the O-H stretching vibrations. The different intensities of the normalized band at 3740 cm −1 in internal reflection and transmission spectra of a NH 4-X zeolite with 0.4 and 1.9 μm particle size, respectively, support the assignment of this band to terminal OH groups.
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