The effect of structure directing agents on the ordering of fluoride ions in pure silica MFI zeolites.

The effect of structure directing agents on the ordering of fluoride ions in pure silica MFI zeolites.
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结构导向剂对纯二氧化硅 MFI 沸石中氟离子排序的影响。

DOI:
10.1039/c5cp00834d
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发表时间:
2015
期刊:
PCCP
影响因子:
--
通讯作者:
Brace SL
Brace SL
中科院分区:
--
文献类型:
--
作者:
Brace SL

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采用魔角旋转固体核磁共振技术研究了不同尺寸的结构导向剂对纯二氧化硅MFI沸石中氟离子有序性的影响。通过使用甲基三丁基铵阳离子作为结构导向剂合成含氟化物的纯二氧化硅MFI沸石,可以将氟离子在室温下观察到的有序类型从先前报道的动态无序改变为静态无序。这种氟化物订购如何发生的初步机制建议基于库仑相互作用的正电荷之间的氮和负的氟离子,在沸石框架内,与不同大小的四烷基铵阳离子。
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.
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