STUDY OF THE SORPTION AND ACIDIC PROPERTIES OF MTW-TYPE ZEOLITE

The acidity of H-MTW-type zeolite has been investigated using infrared spectroscopy of adsorbed pyridine. Pore volume has been measured by n itrogen and n-hexane adsorption. The zeolite exhibits infrared signals at 3612 and 3580 cm(-1) tentatively attributed to bridging hydroxyl g roups vibrating in the main channel and in the six-membered rings of t he structure, respectively. Both hydroxyl groups possess high acid str ength and are readily accessible to pyridine. H-MTW shows a n-hexane c racking activity at 350 degrees C comparable to that obtained with MFI and BEA-type materials with a product selectivity between medium and large pore structural types.