Synthetic aspects template theory for zeolite synthesis

2 SYNTHETIC ASPECTS TEMPLATE THEORY FOR ZEOLITE SYNTHESIS [Pg.2]

A similar organized solvent mantle is proposed to be present around the silicate species and a displacement of the hydration mantle around the SDA by the silicate species is the origin of the SDA-silicate interaction. Long-range order is attained in a consecutive layer-by-layer zeolite growth step. This proposed formation mechanism is in agreement with results of an in situ SAXS and WAXS study by de Moor et a//151 of the same system. Their results show the initial formation of colloidal [Pg.3]

Bu et al. investigated the role of methyl amine as the organic template in thesynthesis of a series of zeotype germanates. In the absence of the template a two-dimensional layered structure was formed. In contrast, in the presence of methylamine a three-dimensional framework evolved from these sheets.1191 [Pg.6]

However, the structure-directing effect of the template on the final framework structure was not elucidated even in this study. In situ studies into the structural features of the template species at the gel stage and during crystallization are needed to shed more light on this issue. [Pg.7]

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