摘要: The history of extra-large pore, crystalline materials is briefly reviewed. Relationships between pore molecular sieves and ordered mesoporous solids are outlined the difficulties in creating crystalline, discussed. possible, importance three-membered rings preparation microporous and/or structures described. dichotomy high cost production via large, organic structure-directing agents low inorganic solid for typical commercial applications enumerated a new synthetic strategy provided to circumvent this problem.