| This work involved the study of dechlorination of oil by bentonite and Y zeolites. Methods of liquid ion-exchange and kneading were applied to modify Y zeolites. Effects of metal cations, loading, activation temperature and reaction temperature on the dechlorination were accessed by performing dynamic tests. The results indicated that Y zeolites were fine carrier and the textual structure and acidity of them contributed to dechlorination. Modified NaY zeolites were prepared by the method of liquid ion-exchange and the capacity of dechlorination followed the sequence of CeY> NaY> CoY> NiY> CuY. XPS confirmed that the chemical state of the cation in zeolites affected the dechlorination performance of modified zeolites and cerium in the form of Ce3+was more favorble for dechlorination.1.25% Fe/USY zeolite calcinated at 500℃ prepared by the method of kneading performed the best capacity for the removal of chlorine from oil. Deactivation of Fe/USY zeolite was caused by the obvious decline of surface area and acidic sites. Fe/USY zeolite had excellent regeneration performance. The optimal reaction temperature of dechlorination was 150℃ and dechlorination reaction mainly followed the mechanism of chemical adsorption. |
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