Research into property of alkali metal-loaded zeolite

本课题首次研究了Si/Al=1.5的lta型载钾沸石。在^<27>Al核磁共振谱上，除了零位移分量外，还发现了右侧或正侧的微位移和肩状分量。发现这个附加组分与零移组分表现出不同的核磁共振性质。该结果已在第13届国际插层化合物学术会议（ISIC13）上报道并作为研究论文发表。用核磁共振技术对富钾型沸石进行了研究。在每个超笼的钾含量为7.1，转变温度为6 K的样品中，观察到^<23>Na NMR的位移组分。由于这些组件是按磁化率缩放的，因此可以将其视为Knight shift。另一方面，对于^<27>A1，只观察到加宽分量。这两个事实都表明，笼中碱原子团簇的电子云（^<23>Na原子核）与沸石骨架（^<27>Al原子核）几乎是分离的。这一结果已在国际磁学会议（ICM2006）上报道并作为研究论文发表。还研究了一个负载水平为饱和状态的样品，其中每个超笼平均负载钾量为9.0，没有观察到磁转变。在^<23>Na核磁共振谱中发现了几倍大位移的新组分。此外，在^<27>Al核磁共振谱上，发现了零移分量正侧的光谱变形图或肩状结构。这些情况可能对应于笼中原子团簇的电子云随着负载水平的增加而增大。这个结果现在正在提交过程中。研究了脱水lta型沸石中^<27>Al核磁共振的T_2性质。只有在卫星转变的温度依赖性上才发现异常的倾斜和快速下降。这种性质的起源可以由电场梯度的涨落而不是局部磁场的涨落来给出。这项研究的结果已发表在杂志上。少

Potassium-loaded LTA-type zeolite with Si/Al=1.5 has been studied at first in this project. Slightly shifted and shoulder like component on the right hand or positive side has been found on ^<27>Al NMR spectrum in addition to the zero-shift component. This additional component has been found to show different NMR property from the zero-shift component. Such result has been reported in the 13th International Symposium on Intercalation Compounds (ISIC13) and published as a research paper.Potassium-loaded FAU-type zeolite has been studied with NMR technique. Shifted components have been observed for ^<23>Na NMR in a sample with loading level of 7.1 of potassium per supercage, whose transition temperature is 6 K. Since those components are scaled with magnetic susceptibility, those can be treated as Knight Shifts. On the other hand for ^<27>A1, only widened components are observed. Both of the facts reveal us that the electron cloud of the alkali atom cluster in the cage, where ^<23>Na nuc … More lei lie, is almost separated from the framework of zeolite, where ^<27>Al nuclei lie. This result has been reported in the international conference for magnetism (ICM2006) and published as a research paper. A sample with loading level of saturation condition, where average amount of 9.0 of potassium is loaded per supercage and no magnetic transition is observed, has also been studied. New components with several times large amount of shifts have been found for ^<23>Na NMR spectrum. In addition, deformed figure of spectrum or shoulder like structure on the positive side of the zero shift component, has been found on ^<27>Al NMR spectrum. These circumstances may correspond to growing up of the electron clouds of the atomic clusters in the cages by increasing of loading level. This result is now in the course of submission.T_2 property of ^<27>Al NMR in dehydrated LTA-type zeolite has been studied. Anomalous dip and rapid decrease has been found on the temperature dependence only for the satellite transition. The origin of this property may be given by the fluctuation of the electrical field gradient, not by that of local magnetic field. The result of the research has been published in a journal. Less