Abstract
A series of modified ZSM-5 zeolites were synthesized hydrothermally, progressively substituting iron atoms for the framework aluminium of ZSM-5 type zeolite. The isomorphous substitution was confirmed by FT—IR analysis. The effects of substrate composition, aging time, reaction temperature, and reaction time upon the crystallization of Fe-ZSM-5 were investigated. The catalytic performance of a number of samples of modified ZSM-5 with different SiO 2/Fe 2O 3 ratios was examined in the vapor phase reaction of the methanol conversion to hydrocarbons, and the xylene isomerization reaction. The activities, selectivities and the deactivation of these catalysts were investigated at 350–450°C under atmospheric pressure. Acid strength and acid site distribution on each catalyst were measured by TPD of pyridine. Structural characterization and thermal stability were also examined using XRD, SEM and TG/DTA.
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