The effect of structure directing agents on the ordering of fluoride ions in pure silica MFI zeolites
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The effect of different sizes of structure directing agents on the ordering of the fluoride ions in pure silica MFI zeolites has been determined using magic angle spinning solid state NMR. By synthesizing fluoride containing pure silica MFI zeolites using methyltributylammonium cations as the structure directing agent, it has been possible to change the type of ordering seen for the fluoride ions at room temperature from the previously reported dynamic to static disorder. An initial mechanism for how this fluoride ordering occurs is suggested based upon the coulombic interaction between the positive charge on the nitrogen and the negative fluoride ion, within the zeolite framework, with different sizes of tetraalkylammonium cations.
Brace , S L , Wormald , P & Darton , R J 2015 , ' The effect of structure directing agents on the ordering of fluoride ions in pure silica MFI zeolites ' Physical Chemistry Chemical Physics , vol 17 , no. 18 , pp. 11950-11953 . DOI: 10.1039/c5cp00834d
Physical Chemistry Chemical Physics
Copyright 2016 the Authors. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/).
The authors would like to thank Keele University and the University of St Andrews for providing a PhD studentship for SLB. PW would like to thank the EPSRC for funding (EP/E041825/1). RJD would like to thank Prof. Colin Fyfe of the University of British Columbia for useful discussions and for providing NMR spectrometer time for initial results.
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