Abstract
We report an in-situ spectroscopic study of the chemical nature of the adsorbed species present in porous solids, such as aluminophosphates, during adsorption of simple gases, methanol, and water. Diffuse reflectance FTIR spectroscopy was used to distinguish between chemisorbed and physisorbed surface OH groups and identify their connection with surface protionic properties. Information on the extents of hydrogen-bonding, e.g. fraction of non-hydrogen-bonded and hydrogen-bonded species, and the adsorbate-adsorbate and adsorbate-adsorbent interactions were obtained, together with details on the structures of the various hydrogen-bonded species present. Experimental data obtained from adsorption measurements on VPI-5 were in qualitative agreement with results obtained from Grand Canonical Monte Carlo (GCMC) molecular simulations. Density profile plots were also obtained from the GCMC results.
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