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	水对氩气中催化法分解甲烷制备单壁碳纳米管的影响; Effects of H2O on preparation of single-wall carbon nanotubes (SWCNT) by catalytic decomposition of CH4 in Ar
	刘霁欣 ; 任钊 ; 段连运 ; 谢有畅
	2004
关键词	SWCNTs 水 氧化物 Fe-Mo合金
英文摘要	用“柠檬酸法”制备W Fe MgO和Mo Fe MgO催化剂 ,以Ar为载气 ,在 12 73K催化分解CH4制单壁碳纳米管(SWCNTs) ,发现原料气中加水和不加水对产物的影响极大 .不加水时 ,产物中SWCNTs含量极低 ,以无定形碳和多壁碳纳米管 (MWCNTs)为主 ;加少量水时 ,产物绝大部分是直径在 1～ 3nm左右SWCNTs形成的管束 .在 12 73K下 ,H2 O分压在 0 67～ 2 0kPa时得到SWCNTs含量较高的产物 ,10 0mg催化剂上的碳产量为 40～ 5 2mg .进一步增加原料气中的水分压到 2 7kPa ,则无碳产物生成 .通过对比实验、粗产物...; W-Fe-MgO and Mo-Fe-MgO catalysts were prepared by the "citric acid" method. CH4 (60 mL/min) was decomposed on these catalysts in a small fluidized bed reactor, at 1273 K and normal pressure with Ar (200 mL/min) as carrier gas. It was found that adding small amount of water into the feed gas significantly affected the SWCNT content in the products. Using dry feed gas, the products of CH4 decomposition on the catalysts were mainly amorphous carbon and multi-wall carbon nanotubes (MWCNT). Whereas, when the feed gas contained small amount of water (partial pressure 0.67 to 2.0 kPa), the products of CH4 catalytic decomposition were mainly bundles of single-wall carbon nanotubes (1 similar to 3 nm diameter for single tube), and the carbon yield was 40 similar to 52 mg/100 mg catalyst. But, when the partial pressure of water increased to 2.7 kPa, no carbon product can be obtained. By XRD, MS analysis and comparison of experimental results, the following conclusion can be deduced: The metal oxides and carbides in Mo-Fe-MgO and W-Fe-MgO catalysts are the active phases for CH4 decomposition to amorphous carbon; the Mo-Fe alloys are the active phases for producing SWCNT. With dry feed gas, CH4 decomposition to amorphous carbon on metal oxides and carbides were dominant and the produced SWCNT on Mo-Fe alloys was relatively small, so products are mainly amorphous carbon and MWCNT with very little SWCNT. Adding a little water (partial pressure 0.67 similar to 2.0 kPa) into the feed gas, the decomposition of CH4 to amorphous carbon on oxides and carbides were hindered, so the main products are SWCNT. But adding more water (partial pressure higher or equal to 2.7 kPa) would keep the catalysts all at oxide state with no alloy, so SWCNT could not be formed and no other carbon product either.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000221044800006&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); 10; 08; 775-782; 62
语种	中文
出处	万方 ; 知网 ; SCI
出版者	化学学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/78580]
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,段连运,等. 水对氩气中催化法分解甲烷制备单壁碳纳米管的影响, Effects of H2O on preparation of single-wall carbon nanotubes (SWCNT) by catalytic decomposition of CH4 in Ar. 2004-01-01.

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