The role of trispyrrolidinium cation as the structure-directing agent of the ZSM-18 zeolite structure is explained by a close matching between the template and the zeolite walls. Two template orientations are proposed, and their respective structure-directing abilities are discussed in terms of template−zeolite energetic interactions. The relation of the template orientation and the Al distribution of the ZSM-18 structure is explained, and the preferential substitution of Al in the three-membered rings of ZSM-18 is explained from the results of the calculations, in accordance with the XRD solution of the structure.
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Sabater et al. (2001) studied this question.
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