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催化学报  2014 

固相浸渍法和湿浸渍法制备CuO/CeO2催化剂及其CO氧化性能的对比研究

DOI: 10.1016/S1872-2067(14)60138-8, PP. 1347-1358

Keywords: 一氧化碳氧化,氧化铜/二氧化铈,固相浸渍法,湿浸渍法,协同作用机制

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Abstract:

?采用固相浸渍法和常规湿浸渍法制备了一系列CuO/CeO2催化剂,并结合X射线衍射(XRD)、氢气-程序升温还原(H2-TPR)、激光拉曼光谱(LRS)、原位漫反射红外光谱(insituDRIFTS)、X射线光电子能谱(XPS)等手段考察了制备方法对催化剂结构性质及其在CO氧化反应中性能的影响.XPS和H2-TPR结果表明,固相浸渍法更有利于得到高分散的铜物种,并促进CuO物种的还原.LRS结果表明,相比于湿浸渍法,固相浸渍法能产生更多氧空位,而这些氧空位可以活化参与反应的O2.CO氧化活性测试结果表明,当铜负载量相同时,固相浸渍法制备的催化剂相比于湿浸渍法表现出更好的催化性能.结合多种表征结果发现,催化剂CO氧化性能与其表面氧空位和Cu+-CO浓度紧密相关,提出了CuO/CeO2催化剂在CO氧化反应中可能的协同作用机制.

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