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Fig. 1 illustrates another point of view for the approach from porous materials to zeolites: starting from porous materials, passing though nanostructured solids (this would include materials such as MCM-41 and MCM-48) [13] and crystalline porous solids such as octahedral–pentahedral–tetrahedal framework silicates (ETS-4, ETS-10, etc.) [14], this classification would converge to the classical zeolites after zeotypes, i.e. SAPOs and AlPOs having zeolite type structures but incorporating other different metals from Si and Al in their composition [15]. Ultimately, the four main characteristics of zeolites are their tetrahedral framework, their cavity system, and the presence of water and charge compensating cations in well defined crystallographical positions. The last two would not be strictly applicable in all cases but depend on the chemical composition (Si/Al ratio) of the zeolite. Besides, from a practical point of view, zeolites are environmental-friendly in technological processes [16]. |
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