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Preparation and Characterization of Lid-Occluded LiLSX Zeolite

机译:含盖LiLSX沸石的制备与表征

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LiCl-occluded LiLSX (Li exchanged Low Silica X zeolite with Si/Al=1.0) was prepared by a heat treatment after evaporating a LiLSX or NaLSX slurry with LiCl,followed by lithium exchange in the case of NaLSX.The amount of occluded LiCl increased with increasing of the temperature.LiCl-occluded LiLSX prepared from NaLSX had a higher crystallinity than that prepared from LiLSX.The difference in crystallinity is explained as being related to the difference in the distortion of the skeleton structure of the zeolites.Chloride anions in high-crystallinity LiCl-occluded LiLSX were found to be located in sodalite cages by a Fourier synthesis of the powder X-ray diffraction pattern.The location of lithium cations was investigated based on the adsorption properties of nitrogen at room temperature and existing data on salt-occluded zeolites.Lithium cations in LiCl-occluded LiLSX are thought to simultaneously occupy the adjacent sites I and I'.
机译:在用LiCl蒸发LiLSX或NaLSX浆料后,通过热处理制备LiCl吸附的LiLSX(Li交换的低硅X沸石,Si / Al = 1.0),随后在NaLSX的情况下进行锂交换,从而增加了LiCl的吸附量。 NaLSX制备的LiCl封闭的LiLSX结晶度高于LiLSX制备的结晶度。结晶度的差异与沸石骨架结构变形的差异有关。通过粉末X射线衍射图的傅里叶合成,发现结晶度为LiCl的LiLSX位于方钠石笼中,并根据室温下氮的吸附特性和现有盐分数据研究了锂阳离子的位置LiCl吸附的LiLSX中的锂阳离子被认为同时占据了相邻的位点I和I'。

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