Enfoque pedagógico

The formation of SAPO-37 was examined under both HTS and DGC conditions by using an assortment of techniques including PXRD, SEM, AFM, and solid-state NMR. The results indicate that crystallization pathways for HTS and DGC are similar. Under HTS conditions, the precursor initially is only composed of the large cavities whose size is equivalent to two directly connected supercages. Increasing the crystallization time leads to the slow formation of sodalite cages that are connected to the cavities. Under DGC conditions, the precursor initially not only contains the large cavities, but also quasi-sodalite cages. Thus, the precursors are almost the same. Further,

the precursors are mainly AlPO in nature with little or no Si. The Si incorporation involves forming aluminosilicates first and then incorporating isolated Si(OAl)4 species into the FAU framework. The AFM data suggest that SAPO-37 crystal growth under HTS conditions follows the “birth and spread” mechanism and the (111) crystal surfaces are terminated by different structural building units.

6.5

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Chapter 7

Examining the Crystallization Process of