铜锆复合氧化物的结构对其催化选择还原一氧化氮性能的影响

doi:10.3321/j.issn:0567-7351.2001.05.016

CORC > 北京大学 > 化学与分子工程学院

	铜锆复合氧化物的结构对其催化选择还原一氧化氮性能的影响; The Structure of CuO- ZrO2 Mixed Oxides and Its Influenceon the Catalytic Selective Reduction of NO by Propene
	马军 ; 尉继英 ; 朱月香 ; 冯华升 ; 蔡小海 ; 谢有畅
刊名	化学学报
	2001
关键词	铜锆复合氧化物氮氧化物选择还原催化性能 CuOZrO2 NOx selective reduction catalytic performance
DOI	10.3321/j.issn:0567-7351.2001.05.016
英文摘要	用浸渍法和共沉淀法分别制得CuO-ZrO2复合氧化物具有不同的选择还原NOx的催化性能.采用XRD,BET,EXAFS和H2-TPR等手段对样品进行了表征.发现浸渍法制备的样品具有的比表面较大,氧化锆被稳定在四方相.EXAFS实验表明,浸渍法制得样品的铜离子填入氧化锆表面空穴中,并以Cu+形式存在;而500℃焙烧条件下用共沉淀法引入的铜离子可部分取代锆离子,在氧化锆体相高度分散形成均匀的无定形固溶体.铜离子在氧化锆体相的高度分散是形成表面孤立铜物种的关键.溶入氧化锆体相的铜离子在取代部位由于局部负电荷而使氧化性降低,是共沉淀法制备样品具有较高催化活性的主要原因.; Different catalytic performances of CuO - ZrO2 mixed oxides prepared by impregnation or co precipitation method for selective reduction of NO tin the presence of O-2 were investigated. The structures and properties of the catalysts were characterized Ly XRD, BET surface area measurement, EXAFS and H-2 - TPR measurements. The CuO - ZrO2 mixed oxides prepared by impregnation method had larger surface area than those prepared by co - precipitation method. The zirconium oxide was stabilized at the tetragonal phase. EXAFS measurement shows that in the CuO - ZrO2 mixed oxides prepared by impregnation method the copper ions first fill in the surface hole of zirconium oxide and stay there as Cu+. Under the calcination at 500 degreesC, the Cu2+ ions that brought into ZrO2 by co- precipitation method carl replace Zr4+ and form a uniform amorphous solid solution. The high -dispersion of Cu ions in zirconium oxide was the key element that led to formation of highly dispersed isolated copper species on the surface. Substitution of Zr4+ by Cu2+ ions could decrease the reducibility of copper species and the activity of the complete oxidation of propene. The local structure difference of copper species was the main reason for the high activity and selectivity of the CuO - ZrO2 mixed oxides prepared by co - precipitation method.; 国家重点基础研究发展计划(973计划); 国家自然科学基金; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000168913600016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科学引文数据库(CSCD); 4; 5; 713-717; 59
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/84040]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	马军,尉继英,朱月香,等. 铜锆复合氧化物的结构对其催化选择还原一氧化氮性能的影响, The Structure of CuO- ZrO2 Mixed Oxides and Its Influenceon the Catalytic Selective Reduction of NO by Propene[J]. 化学学报,2001.
APA	马军,尉继英,朱月香,冯华升,蔡小海,&谢有畅.(2001).铜锆复合氧化物的结构对其催化选择还原一氧化氮性能的影响.化学学报.
MLA	马军,et al."铜锆复合氧化物的结构对其催化选择还原一氧化氮性能的影响".化学学报 (2001).