Structural Analysis of High-Silica Ferrierite with Different Structure-Directing Agents by Solid-State NMR and Ab Initio Calculations
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- OKA Hideyuki
- Analysis & Research, TOSOH Analysis and Research Center
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- OHKI Hiroshi
- Department of Chemistry, Faculty of Science, Shinshu University
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説明
The host-guest interaction in high-silica ferrierite (FER) with different structure-directing agents (SDA), pyridine and piperidine, was analyzed by solid-state 29Si NMR relaxation experiments and molecular-orbital calculations. Qualitative and quantitative knowledge of the SDA structure obtained by these methods provides significant insight for understanding the functions in a template, and the stabilizing role of the SDA. Relaxation experiments show a larger magnetic dipolar interaction between the silicon and hydrogen atoms in piperidine as compared to that in pyridine, and the results correlate with the bonding property in terms of the distance between the zeolite framework and the SDA. The 1H MAS NMR spectrum shows that the pyridine molecules mainly act as pore fillers in the pyridine-FER. In contrast, it was presumed that piperidine, adjacent to the aluminosilicate framework and framework defects, acted as a counter cation to balance the charge in the piperidine-FER. H+-FER synthesized with piperidine shows a lower hydrothermal stability as compared to that synthesized with pyridine. The hydrothermal stability of H+-FER is discussed by considering the contributions of framework defects and the different properties pertaining to the bonding between the zeolite framework and the SDA.
収録刊行物
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- Analytical Sciences
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Analytical Sciences 26 (4), 411-416, 2010
社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204258371072
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- NII論文ID
- 10026782717
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- NII書誌ID
- AA10500785
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- ISSN
- 13482246
- 09106340
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- NDL書誌ID
- 10637794
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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