The field of microporous compounds has progressively widened in these last years, well beyond the field of zeolites sensu stricto, due to investigations in Materials Sciences aimed at preparing and characterizing new types of molecular sieves, distinct from zeolites either in the kind of cations building up the tetrahedral framework (beryllosilicates, phosphatosilicates…) or even in the kind of polyhedra building up the scaffolding capable of sorption, exchange, and catalysis.

This second type of compounds, characterized by tetrahedral-octahedral, tetrahedral-pentahedral-octahedral, more in general by heteropolyhedral frameworks, has been widely studied since the nineties of the last century (preparation and characterization of titanosilicates...

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