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.
Revised: January 23, 2012 |
Published: December 1, 2001
Citation
Sabater M.J., and G. Sastre. 2001.A Computational Study on the Templating Ability of the Trispyrrolidinium Cation in the Synthesis of ZSM-18 Zeolite.Chemistry of Materials 13, no. 12:4520-4526.