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Development of Functional Adsorbent for Air Separation by Addition of Metal Cluster Ion into Zeolites

沸石中添加金属簇离子开发空分功能吸附剂

基本信息

批准号：
14550754
负责人：
YAMAZAKI Tatsuya
金额：
$ 2.3万
依托单位：
Ishinomaki Senshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550754/
关键词：
Zeolite Air Separation Cation site Cu cluster ion Surface modification Infrared Spectroscopy Adsorption Low Silica X FAUゼオライト吸着分離窒素吸着酸素吸着空気吸着分離

项目摘要

An adsorption method is one of the effective air separation processes to oxygen produce. Recently, the high-performance adsorbent is strongly required for cost and energy reduction. In this study, to develop a high performance adsorbent for air separation, zeolite adsorbents were modified based on the surface analyses (spectroscopy and thermodynamic analyses etc.). The result obtained in this work is summarized as follows.1.Modification of zeolite surface using metal ion cluster ions.To enhance the amount of N_2 selective adsorption site, Li-CuLSX and Li-Ag-LSX were prepared. Namely, Ag and Cu ion clusters were formed in sodalite cage and/or D6R of low silica X zeolite (LSX zeolite) in order to block ineffective cationic sites (site-I) physically, and Li^+ ions were exchanged into new cation sites created by reduction of the cluster ions, To prepare stable adsorbents with high surface area, the preparing condition were optimized.2.Surface analysis of metal ion cluster included LSX zeolites.In order to analyze surface properties of Li-CuLSX and Li-Ag-LSX, the characteristics of adsorption sites were studied by infrared spectroscopy using CO and CH_4 as adsorption probe molecules. Amount of CO adsorption on Li-CuLSX enhanced to about 3 times than that on Li-LSX. The result showed that Li^+ ions were selectively exchanged to site III using the cluster ion doping method. Furthermore, the methane adsorption showed that the electrostatic field of site III was stronger than that of Li-LSX. This phenomenon may be attributed to an effect of copper cluster ions existed in D6R and/or sodalite cage.3.N_2 and O_2 adsorption and air separation characters of Li-CuLSX.The quantitative analyses of gas absorption and separation characteristics for various adsorbents were carried out. At 211K, air separation factor of Li-CuLSX is larger than that of Li-LSX.

吸附法是有效的空气分离制氧工艺之一。近年来，为了降低成本和能源，强烈需要高性能吸附剂。在本研究中，为了开发用于空气分离的高性能吸附剂，基于表面分析（光谱学和热力学分析等）对沸石吸附剂进行了改性。本工作取得的主要成果如下：1.金属离子簇离子对沸石表面的改性。为了增加N_2选择性吸附位点的数量,制备了Li-CuLSX和Li-Ag-LSX。即，在低硅X沸石（LSX沸石）的方钠石笼和/或D6R中形成Ag和Cu离子簇，以物理阻挡无效的阳离子位点（位点-I），并将Li^+离子交换到通过簇离子还原产生的新阳离子位点，为了制备具有高比表面积的稳定吸附剂，制备条件为 2.LSX沸石金属离子簇的表面分析。为了分析Li-CuLSX和Li-Ag-LSX的表面性质，以CO和CH_4为吸附探针分子，通过红外光谱研究了吸附位点的特征。 Li-CuLSX 上的 CO 吸附量比 Li-LSX 上提高了约 3 倍。结果表明，采用簇离子掺杂方法，Li^+离子选择性地交换到III位。此外，甲烷吸附表明位点III的静电场强于Li-LSX。这种现象可能是由于D6R和/或方钠石笼中存在的铜簇离子的作用所致。3.Li-CuLSX的N_2和O_2吸附和空气分离特性。对不同吸附剂的气体吸附和分离特性进行了定量分析。在211K时，Li-CuLSX的空气分离系数大于Li-LSX。