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

被引:249
作者
Yamashita, H
Matsuoka, M
Tsuji, K
Shioya, Y
Anpo, M
Che, M
机构
[1] UNIV OSAKA PREFECTURE,COLL ENGN,DEPT APPL CHEM,SAKAI,OSAKA 593,JAPAN
[2] UNIV PARIS 06,LAB REACT SURFACE,URA 1106 CNRS,F-75252 PARIS 05,FRANCE
关键词
D O I
10.1021/jp952666z
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:397 / 402
页数:6
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