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	催化剂组成和反应条件对W-Fe-MgO催化分解甲烷制备单壁碳纳米管的影响; Effects of Composition of W-Fe-MgO Catalyst and Reaction Conditions on Preparation of Single-Walled Carbon Nanotubes by Catalytic Decomposition of Methane
	刘霁欣 ; 任钊 ; 谢有畅
	2004
关键词	钨 铁 氧化镁 负载型催化剂 单壁碳纳米管 甲烷 分解 流化床反应器 tungsten iron magnesium oxide supported catalyst single-walled carbon nanotube methane decomposition fluidized bed reactor
英文摘要	采用"柠檬酸法"制备的W-Fe-MgO催化剂,在小型流化床反应器中分别以Ar和H2为载气在1 073～1 373 K下催化甲烷分解制单壁碳纳米管(SWCNTs).实验结果表明,用H2作载气制备SWCNTs的最佳温度为1 373 K,在Fe∶Mg摩尔比≤10∶100时,催化剂上的碳产率随其W载量的增加而显著增大,产物中的SWCNTs含量也保持在较高水平,最高碳产率可达55%(相对于催化剂的质量分数).而使用Ar载气时最佳反应温度为1 073 K, 用W∶Mg摩尔比为1∶100的催化剂可制得SWCNTs含量较高的产物,而W∶Mg摩尔比超过1∶100的催化剂上产物中的SWCNTs含量显著下降.根据XRD和XPS实验结果推测了W-Fe-MgO催化剂上生长SWCNTs的活性相.; The W-Fe-MgO catalyst was prepared by calcination of the mixture of Mg(NO3)(2) (.) 6H(2)O, Fe(NO3)(3) (.) 9H(2)O, ammonium tungstate and citric acid at 823 K and used to prepare single-walled carbon nanotubes (SWCNTs) in a fluidized bed reactor with 25% CH4-H-2 or 25% CH4-Ar gas mixture at 1073similar to1373 K. The effects of reaction temperature, carrier gases and catalyst composition on the carbon production were investigated by Raman spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results indicated that the optimal temperature of methane catalytic decomposition was 1 373 K using H-2 as carrier gas and 1073 K using Ar as carrier gas. In H-2 atmosphere at 1373 K, the carbon yield increased with the W content in the catalyst and the SWCNTs content in the products was constantly high; the highest carbon yield of SWCNTs could be up to 55% (based on the catalyst mass) on the catalyst with a W:Fe: Mg molar ratio of 3: 10: 100. In Ar atmosphere at 1073 K, a high SWCNTs content product could be obtained on the catalyst with W:Mg = 1:100, but with W:Mg more than 1: 100 the SWCNTs content in the products dropped sharply. According to the results of XRD and XPS analysis, active phases for the SWCNTs growth is suggested.; 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:000223181200013&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); 4; 7; 561-570; 25
语种	中文
出处	万方 ; SCI ; http://d.g.wanfangdata.com.cn/Periodical_cuihuaxb200407013.aspx
出版者	催化学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/80614]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	刘霁欣,任钊,谢有畅. 催化剂组成和反应条件对W-Fe-MgO催化分解甲烷制备单壁碳纳米管的影响, Effects of Composition of W-Fe-MgO Catalyst and Reaction Conditions on Preparation of Single-Walled Carbon Nanotubes by Catalytic Decomposition of Methane. 2004-01-01.

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