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Preparation and Characterization of New CuCl/H Catalysts

LI Chuihua LI Dan SHI Qihong (Science Center Shantou University Shantou 515063) ZHU Qiming ( Chemistry Department Qinghua University Beijing 100084)  
CuCl can be directly exchanged and highly dispersed into zeolite H without formation of Cu2+ by solid\|state ion exchange method at 573 K, 1.0 10-3 Pa for 24 h. CuCl/H systems with different CuCl ratio were prepared; the critical monolayer dispersion capacity into H of CuCl was 21.2% ( CuCl % ), high dispersion of cuprous chloride molecules can result in more active sites for catalysis and adsorption. From IR in\|situ results, it was found that solid\|state ion exchange process of cuprous ions and dispersion process of cuprous chloride molecules occur simultaneously during solid\|state ion exchange. When the ratio of CuCl is \{0.35% ( CuCl% ),\} ion\|exchange of Cu+ predominated and the intensity of the -OH at 3597 cm-1 band decreases, Cu+ ions are mainly located at SI sites. In contrast, when the ratio of CuCl is 5% and 15%, the bands at 3597, 3635, 3740 cm-1 disappear totally. The XRD results indicated that all CuCl molecules are in monolayer dispersion. The IR spectra of
【Fund】: 国家自然科学基金
【CateGory Index】: O643.31
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