The controllable orientation of TS-1 crystals on a porous alumina substrate is achieved by using a thin chitosan film as a structure-directing matrix. A single layer of TS-1 crystal grains is fully b-oriented. The crystal grains in a multilayer TS-1 film are preferentially b-oriented (ca. 70%) according to XRD and pole figure analyses (see figure). The obtained membrane shows strong selectivity in an oxidation-catalysis experiment.
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Wang et al. (2006) studied this question.
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