NMR Study of the Host Structure and Guest Dynamics Investigated with Alkane/Alkene Mixtures in Metal Organic Frameworks ZIF-8
NMR Study of the Host Structure and Guest Dynamics Investigated with Alkane/Alkene Mixtures in Metal Organic Frameworks ZIF-8
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DOI：
10.1021/acs.jpcc.8b11673
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发表时间：
2019-01-24
影响因子：
3.7
通讯作者：
Haase, Juergen
中科院分区：
文献类型：
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作者：
Freude, Dieter;Dvoyashkina, Nina;Haase, Juergen
在金属有机骨架家族中，ZIF-8 型沸石-咪唑酯骨架 (ZIF) 是最有前途的材料之一，具有用于碳氢化合物分离的潜在应用，特别是烷烃和烯烃的分离。我们应用核磁共振波谱来探索代表性烷烃/烯烃混合物与主体框架的相互作用以及混合物中各种组分的迁移率。例如，与基于 MFI 的膜已知的分离模式不同，较快分子（烯烃）的迁移率被发现基本上不受较慢扩散分子（烷烃）存在的影响。此外，H-2 和 Zn-67 魔角旋转 NMR 有助于 ZIF-8 的表征，以寻找客体引起的晶格结构变化。
Within the family of metal organic frameworks, the zeolite-imidazolate framework (ZIF) of type ZIF-8 is among the most promising materials with potential application for hydrocarbon separation, notably of alkanes and alkenes. We have applied NMR spectroscopy for exploring the interaction of representative alkane/alkene mixtures with the host framework as well as the mobility of the various components in their mixture. Deviating from, for example, the separation patterns known for MFI-based membranes, the mobility of the faster molecules (alkenes) is found to remain essentially unaffected by the presence of more slowly diffusing molecules (alkanes). In addition, H-2 and Zn-67 magic-angle spinning NMR contributes to the characterization of ZIF-8 in search for guest-induced changes in the lattice structure.