In-Situ XAFS, Photoluminescence, and IR Investigations of Copper Ions Included within Various Kinds of Zeolites. Structure of Cu(I) Ions and Their Interaction with CO Molecules
In-Situ XAFS, Photoluminescence, and IR Investigations of Copper Ions Included within Various Kinds of Zeolites. Structure of Cu(I) Ions and Their Interaction with CO Molecules
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DOI：
10.1021/jp952666z
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发表时间：
1996-01
期刊：
影响因子：
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通讯作者：
H. Yamashita;M. Matsuoka;Kouji Tsuji;and Yasushi Shioya;M. Anpo;M. Che
中科院分区：
文献类型：
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作者：
H. Yamashita;M. Matsuoka;Kouji Tsuji;and Yasushi Shioya;M. Anpo;M. Che
采用原位XAFS、光致发光和红外测量相结合的方法对沸石中铜离子的配位几何进行了表征，以详细描述在真空条件下热处理沸石通道中形成具有平面3坐标或线性2坐标几何结构的孤立Cu+单体。沸石中的Cu+离子以分离的Cu+单体和（Cu+−Cu+）二聚体的形式存在，它们的相对浓度强烈依赖于所用沸石的类型。ZSM-5分子筛和丝光沸石分子筛的铜阳离子大部分以Cu+单体的形式存在，而y分子筛则相反。CO分子选择性地吸附在孤立的Cu+单体上，扭曲配位几何，形成稳定的一对一Cu+−CO配合物。
The characterization of the coordination geometry of copper ions included within zeolites has been carried out with a combination of in-situ XAFS, photoluminescence, and IR measurements in order to obtain a detailed description of the formation of isolated Cu+ monomers with planar 3-coordinate or linear 2-coordinate geometry in the zeolite channels by thermal treatment under vacuum. The Cu+ ions within the zeolites were found to exist as isolated Cu+ monomers and (Cu+−Cu+) dimers, their relative concentrations strongly depending on the type of zeolite used. With ZSM-5 and mordenite zeolites, most of the copper cations were found to exist as isolated Cu+ monomers, in contrast to the case of the Y-zeolite. CO molecules were adsorbed selectively only on isolated Cu+ monomers, distorting the coordination geometry to form stable one-on-one Cu+−CO complexes.