EHANCED CATALYTIC ACTIVITY OF ZEOLITE BY EXTRACTION OF ALUMINIUM

摘要

A treated zeolite, a process for its preparation and its catalytic use are disclosed. The zeolite is characterized by a silica to alumina mole ratio of at least 12 and preferably has a Constraint Index of 1 to 12. The zeolite undergoes controlled aluminium extraction by treatment with an aluminum extracting reagent such as a strong mineral acid or a chelating agent. Removal of aluminium from the zeolite in this manner can increase the acid activity of the zeolite.