摘要: Advances in the area of new molecular sieve materials have come preparation zeolite and zeolite-like structures containing framework components other than aluminum silicon exclusively. The aluminosili-cate zeolites offer ion exchange properties, higher thermal stability, high acidity, shape-selective structural features desired by those working areas adsorption catalysis. However, modification subsequent improvement these properties served as a driving force for changing composition microporous materials. Structures with pores larger known 12 rings type Y (ultra-large pore sieves) not yet been produced aluminosilicate system after 30 years synthesis effort; however, compositions possibility that such ultra-large may be realized. For example, natural mineral phosphate cacoxenite (AlFe24O6(OH)12-(PO4)17(H2O)24 · ca.51H2O) contains 14.2 A system. Unlike systems, iron occupy octahedral (Fe) distorted (Al) positions phosphorous occupies tetrahedral structure.
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