A few years ago, the IUPAC recognized a need in the area of ordered microporous and mesoporous materials for a system of terms, whose definitions are generally accepted. A subcommission was formed to address this problem, and eventually a set of recommendations was published (McCusker et al. 2001). These recommendations, which include both basic nomenclature and a standardized crystal chemical formula, are based on common usage and on a systematic classification scheme recently published by Liebau (2003).

Zeolites and zeolite-like materials, with their 3-dimensional, 4-connected inorganic frameworks, served as the basis for this terminology, because they constitute...

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