OH GROUPS AND ACIDIC PROPERTIES OF SAPO-5 AND AIPO<sub>4</sub>-5 WITH IR

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The hydroxyl groups and their acidic properties of AlPO<sub>4</sub>-5, SAPO-5 and HZSM-5 havebeen examined by means of IR spectroscopy using the adsorption of D<sub>2</sub>O and pyridine asa probe. Four hydroxyl groups characterize
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