Abstract
The catalytic properties of the cumene cracking and the o-xylene isomerization on SAPO-5 have been investigated, and compared with those of the AlPO 4 -5 and HZSM-5. The catalyst poisoning has been carried out with pyridine. The results show that the SAPO-5 is catalytically active to these reactions while the AlPO 4 -5 is inactive. The hydroxyl groups and their acidic properties of SAPO-5 have been examined by means of IR spectroscopy with the adsorption of D 2 O and pyridine as a probe. Four hydroxyl groups characterized by the bands near 3745, 3677, 3630 and 3520 cm −1 are clearly observed and they are acidic. The experiments also indicate that both of Bronsted and Lewis acid sites are present on the SAPO-5. From TPD data it is found that the HZSM-5 contains two types of acid sites, medium and strong, while the SAPO-5 contains only one type of medium acid sites.
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