Abstract
H-ZSM-11 zeolite modified with zinc and gallium by ion exchange was investigated using XRD, IR and TPD of ammonia. The modification of the material by zinc produced a lowering of the strong Brønsted acidic sites generating new and strong Lewis sites. Unlike zinc-zeolites, the gallium is localized preferentially on the outer surface of microcrystallites blocking a few Brønsted centers.
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Anunziata, O.A., Pierella, L.B. Nature of the active sites in H-ZSM-11 zeolite modified with Zn(2+) and Ga(3+). Catal Lett 19, 143–151 (1993). https://doi.org/10.1007/BF00771749
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DOI: https://doi.org/10.1007/BF00771749