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The role of sub-colloidal (nano-sized) precursor species in zeolite crystallization

A comparison of different approaches of the formation and evolution of sub-colloidal precursor species during crystallization of MFI-type zeolites showed that, although the formation of sub-colloidal precursor species is almost the same in both homogeneous [initially clear (alumino)silicate solutions] and heterogeneous [(alumino)silicate hydrogels], their further evolution strongly depends on the composition of the reaction mixture, especially presence (heterogeneous systems) or absence (homogeneous systems) of the solid phase as well as presence/absence of aluminium. These differences have been showed and explained through the analysis of relevant processes of crystallization of MFI-type zeolites.

MFI-type zeolites; sub-colloidal precursor species; crystallization; homogeneous system; heterogeneous systems

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