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时间：2007-05-22 16:08:07 编辑加入/取消收藏订制/取消短消息举报该贴

Nanoclustered zeolite Y seeds were prepared
by reacting NaOH (0.088 mol) and NaAlO2 (0.10 mol, Strem
Chemicals) in H2O (8.5 mol) with silicate anions (0.90 mol) in
the form of a sodium silicate solution containing 27 wt % SiO2
and 14 wt % NaOH (Aldrich Chemicals) under vigorous stirring
at 100 癈 overnight. 27Al NMR indicated the exclusive presence
of tetrahedral aluminum (?) 60 ppm), and the XRD pattern of
a thin film sample obtained by evaporation of the seeds solution
showed no Bragg peaks. The formation of a hexagonal mesostructure,
rather than a zeolite, was achieved by lowering the pH
of the seeds solution to a value of 9 and introducing a surfactant
after the initial aging period. Thus, the addition of cetyltrimethylammonium
bromide (0.20 mol), sulfuric acid (0.52 mol) and
water (127 mol) to the seeds solution, followed by an additional
aging period of 20 h at 100 癈 afforded a hexagonal aluminosilicate
mesostructure, which we denote generally as MSU-S,
or, more specifically, 10%Al-MSU-S.

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