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首页> 外文期刊>Catalysis science & technology >High-heat treatment enhanced catalytic activity of CuO/CeO(2)catalysts with low CuO content for CO oxidation
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High-heat treatment enhanced catalytic activity of CuO/CeO(2)catalysts with low CuO content for CO oxidation

机译：高热治疗增强的催化活性措/首席执行官(2)较低的催化剂措内容有限氧化

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摘要

A series of CuO/CeO(2)catalysts with different CuO loadings (0.5, 1, 3, and 5 wt%) were prepared by an impregnation method, and tested for the total oxidation of CO. The samples were characterized by various structural and textural detection techniques including XRD, N(2)sorption, TEM-EDS, H-2-TPR, XPS, andin situDRIFTS. Unexpectedly, the low CuO loading (0.5-3 wt%) samples calcined at high temperature (800 degrees C) exhibited better catalytic performance than those calcined at 500 degrees C, and the catalytic activity gap between the catalysts calcined at 500 degrees C and 800 degrees C shrunk with the increase of copper content. In contrast, when the loading amount of CuO reached a normal value (5 wt%), the CuO/CeO(2)catalyst with low temperature calcination (500 degrees C) obtained a slightly better activity than that calcined at 800 degrees C. The results showed that, for the catalysts with low CuO content (0.5-3 wt%), the higher temperature calcination (800 degrees C) can promote the formation of the coordinatively unsaturated copper atoms and increase the content of active Cu species, resulting in a higher activity than those calcined at 500 degrees C. But this effect was suppressed when the CuO content reached 5 wt%. The coordinatively unsaturated copper atoms, as well as Cu+, were confirmed to be the main active sites of the CuO/CeO(2)catalysts.
机译：一系列的措/首席执行官(2)催化剂具有不同的措载荷(0.5,1,3,5 wt %)准备的浸渍法,检测氧化有限公司样本特征通过各种结构和结构检测技术包括XRD、N(2)吸附,TEM-EDS,H-2-TPR, XPS,移往situDRIFTS。低措加载3 (0.5 wt %)煅烧的样品高温(800度)表现出更好的催化性能比煅烧,享年500岁摄氏度,催化活性之间的差距催化剂煅烧在500摄氏度和800年度减少与增加的铜内容。措达到正常价值(5 wt %),措/首席执行官(2)与低温催化剂煅烧获得略(500摄氏度)活动比煅烧在800度c·结果表明,催化剂较低的措内容(0.5 wt %) 3、越高温度煅烧(800摄氏度)促进协调的形成不饱和铜原子和增加内容活跃的铜物种,导致更高的在500摄氏度的活动比煅烧。但这种效应抑制措内容达到5 wt %。不饱和铜原子,以及铜+确认的主要活动地点措/首席执行官(2)催化剂。

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