Abstract
Water adsorption on H-ZSM-5 (with/without Lewis acid sites; LAS) at room temperature was studied by means of FT-IR spectroscopy. It has been clearly observed that water adsorbs preferentially on LAS. This result indicates that the IR bands at ca. 3550, 2900, 2400, 1600, and 1350 cm−1, which are characteristic of water adsorbed on Bronsted acid sites (BAS), can be used as indicators of BAS; water can serve as an IR-spectroscopic titrant of LAS. Using this fact, an attempt was made to determine the absolute number of LAS in the H-form zeolites using water as a titrant. While this method has many restrictions in this stage, a relatively good result was obtained compared with that obtained previously for the same sample.
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