Hexagonal structures M41S zeolites

The M41s family has several structures, of which the major ones are shown in Figure 2 (5). A common characteristic of virtually all mesoporous materials (including amorphous ones) is a broad x-ray detraction (XRD) peak at low 20. MCM-48 is a cubic structure with two nonintersecting pores. The original structure, MCM-41, is a one-dimensional, hexagonal structure. MCM-50 is a layered ( lamellar ) structure with silica sheets between the layers. The utility of these materials is expected to be limited due to the lack of intersecting, three-dimensional pores such as in the major zeolites, i.e., zeolite Y, ZSM-5, and Zeolite Beta. 

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