High-silica ZSM-5 and [BIZSM-5 (both containing ca. 600 ppm Al) are catalytically activated by hydrothermal treatment in the presence of alumina. Aluminium is transported as an aquospecies from A1,0, into the zeolite and enters the framework in the tetrahedral conformation. The presence of framework B induces enhanced activation, the degree of activation increasing with B content. This is due to the hydrolytic instability of framework B and hence its ready substitution by Al.
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