Strong shape-selective acidic sites were generated inside high silica/alumina ratio ZSM-5 and ZSM-11 zeolites by treatment with aluminum chloride, followed by hydrolysis and calcination. Incorporation of aluminum in the zeolites was indicated by catalytic and ion-exchange studies, and supported by27Al MAS-n.m.r., FT i.r., and ammonia t.p.d. © 1984.
Dessau, R. M., & Kerr, G. T. (1984). Aluminum incorporation into high silica zeolites. Zeolites, 4(4), 315–318. https://doi.org/10.1016/0144-2449(84)90005-8