Fe/MgO催化合成碳纳米管和氮掺杂碳纳米管(英文)  

Synthesis of N-doped and Undoped Carbon Nanotubes on Fe/MgO Catalysts

作　　者：曹永[1,2] 矫庆泽[1] 赵芸[1] 

机构地区：[1]北京理工大学化工与环境学院,北京100081 [2]华北水利水电学院环境与市政工程学院,郑州450011

出　　处：《物理化学学报》2009年第11期2380-2384,共5页Acta Physico-Chimica Sinica

基　　金：国家高技术研究发展计划(863)(2006AA03Z570);北京市自然科学基金(2092026);北京理工大学优秀青年教师资助计划(c2007YS0404)资助项目~~

摘　　要：以MgO负载的Fe为催化剂、正己烷为碳源、乙二胺为氮源,用催化化学气相沉积法合成了碳纳米管(CNTs)和氮掺杂碳纳米管(CNx).通过还原焙烧的Mg/Fe水滑石(LDH)和Mg(NO3)2/Fe(NO3)3前驱体得到具有催化活性的Fe催化剂(Fe-LDH和Fe-Mg(NO3)2/Fe(NO3)3).由这两种催化剂催化合成的CNTs都具有中空的管状结构.Fe-LDH催化合成的CNx具有明显的"竹节"状形貌,而Fe-Mg(NO3)2/Fe(NO3)3催化合成的部分CNx的形貌与"竹节"状不同.该CNx具有厚的管壁且在管壁的石墨层与层之间存在大量的空隙.Fe-LDH催化合成的CNx中氮摩尔分数为6.3%,高于Fe-Mg(NO3)2/Fe(NO3)3催化合成CNx中的5.7%;但后者具有更多的缺陷,石墨化程度更加无序.N-doped and undoped carbon nanotubes（CNx and CNTs） were synthesized by the catalytic chemical vapor deposition of ethylenediamine and hexane on Fe/MgO catalysts.The Fe catalysts were obtained by calcination of a Mg/Fe layered double hydroxide（LDH） and a mixture of Mg（NO3）2/Fe（NO3）3 precursors followed by reduction（Fe-LDH and Fe-Mg（NO3）2/Fe（NO3）3）.The CNTs grown on both catalysts had tubular structures with hollow cores while some of the CNx grown on Fe-Mg（NO3）2/Fe（NO3）3 had a different morphology from the conventional bamboo-shape of those grown on Fe-LDH.This special morphology with thick walls had some space between the graphite layers.The molar content of N in the CNx grown on Fe-LDH was 6.3%,which was a little more than 5.7% found in the CNx grown on Fe-Mg（NO3）2/Fe（NO3）3.However,the latter has more defects and disorders.

关 键 词：碳纳米管 氮掺杂碳纳米管 水滑石 催化剂 前体 化学气相沉积 

分 类 号：TB383.1[一般工业技术—材料科学与工程]