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	制备方法对新型锡锆固溶体催化剂结构及其选择催化一氧化氮还原性能的影响; Influence of Preparation Methods on Structure of Tin-Zirconium Solid Solution and Its Catalytic Performance in NO Selective Reduction
	尉继英 ; 朱月香 ; 谢有畅
	2003
关键词	锡 锆 固溶体 沉淀过程 一氧化氮 选择催化还原 tin zirconium solid solution precipition process nitrogen monoxide selective catalytic reduction
英文摘要	固定SnO2含量为60%,采用不同沉淀方法和在不同沉淀条件下制备了锡锆固溶体催化剂Sn0.45Zr0.55O2,考察了沉淀过程对其结构和性能的影响. 控制尿素浓度为总金属离子(Sn4++Zr4+)浓度的20倍,采用均相沉淀法制备的锡锆固溶体Sn0.45Zr0.55O2对催化NO还原具有最高活性和较好的重复性,在350 ℃下最大NO转化率达到74%. XRD,Raman,XPS,BET比表面测定和孔结构分析表明,沉淀条件不同,沉淀物的成核及生长过程不同,对SnO2与ZrO2之间的固溶度、催化剂表面元素分布、比表面和孔道结构以及催化活性都有较大的影响. ZrO2在SnO2(r)晶格中较高的固溶度、Sn在催化剂表面一定程度的偏析以及催化剂较大的孔径均有利于提高对NO还原反应的催化活性.; Lean NOx catalysis can be viewed as a process in which two oxidants, NOx and O-2, compete for hydrocarbon reductants with limited concentration. SnO2 still has too high catalytic activity for complete combustion of propene, and its relative low melting point (1 630 degreesC) and low specific surface area are also disadvantages to the catalytic performance. By adding a less active metal oxide with high thermal stability and large surface area, such as ZrO2, into SnO2, we first got SnxZr1-xO2 solid solution catalysts exhibiting high activity for NO reduction and good hydrothermal stability. Among them, the sample containing 60% SnO2 showed the highest NO conversion of 71% at 350 degreesC, which suggested that Sn0.45Zr0.55O2 had the best composition. The influence of precipitation process on the structure, surface property and NO reduction activity of the catalysts was studied. A series of Sn0.45Zr0.55O2 solid solution catalysts with the best composition were prepared by different precipitation methods and under different reaction conditions. The sample prepared by the urea-based homogeneous precipitation method with n (urea)/n (Sn4+ + Zr4+) = 20 showed the best performance in NO selective reduction 9 having the highest NO conversion of 74%. The insert of zirconia into tin dioxide with rutile structure was much influenced by the precipitation process and most of the samples with good performance in NO selective reduction were well-formed. The surface element distribution was varied owing to the inconsistent nucleation and growth process under different precipitation conditions. A proper segregation of tin on the surface was of advantage for NO selective reduction. The samples prepared under different precipitation conditions had different specific surface area and pore size distribution, and the large pore showed a promoting effect on NO selective reduction.; 国家重点基础研究发展计划(973计划); 国家高技术研究发展计划(863计划); http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000181567900015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 11; 2; 137-142; 24
语种	中文
出处	万方 ; SCI ; http://d.g.wanfangdata.com.cn/Periodical_cuihuaxb200302015.aspx
出版者	催化学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/80681]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	尉继英,朱月香,谢有畅. 制备方法对新型锡锆固溶体催化剂结构及其选择催化一氧化氮还原性能的影响, Influence of Preparation Methods on Structure of Tin-Zirconium Solid Solution and Its Catalytic Performance in NO Selective Reduction. 2003-01-01.

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