MCM-22 zeolite family and the delaminated zeolite MCM-56 obtained in one-step synthesis

摘要

Zeolite MCM-22 can form via a layered intermediate,which combines the potential of two classes of materials:zeolites and layered solids.Various discrete products with different arrangement of the MCM-22 monolayers have been recognized.A comprehensive overview of the resultant MCM-22 family is presented with the emphasis on synthetic routes and characterization,especially by X-ray diffraction,which allows identification of the various family members.One of the discussed materials,MCM-56,is identified as comprising a disordered collection of MCM-22 monolayers.It is the only delaminated zeolite available via a convenient one-step hydrothermal synthesis.MCM-56 may be a substrate for novel zeolitic materials with designed and tailored structures.