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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Au/CuxMnyOz催化剂的制备、表征及其CO消除性能
DOI: 10.3724/SP.J.1088.2011.10228, PP. 1220-1226
Keywords: 铜,锰,复合氧化物,金,负载型催化剂,一氧化碳,选择性氧化,水煤气变换
Abstract:
？采用溶胶-凝胶法制备了新型CuxMnyOz复合氧化物,并利用沉积-沉淀法制备了1%Au/CuxMnyOz系列催化剂样品,在富H2条件下评价了该催化剂在CO选择性氧化反应和水煤气变换(WGS)反应中的催化性能.结果发现,极少量Au的负载使得CuxMnyOz复合氧化物不仅具有良好的CO氧化活性和选择性,而且在WGS反应中也表现出较高的催化性能.运用N2物理吸附、X射线粉末衍射、X射线光电子能谱、X射线荧光分析、透射电镜和H2程序升温还原等技术对催化剂的物化性质进行表征后发现,CuxMnyOz复合氧化物主要是以类尖晶石相的Cu1.5Mn1.5O4形式存在,其含量与催化剂样品的活性呈对应关系;负载的Au物种大部分是以金属态Au0粒子形式分散在复合氧化物上,并与其中Cu1.5Mn1.5O4形成良好的协同效应,从而提高了催化剂的还原能力.
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