物理化学学报 >> 2009, Vol. 25 >> Issue (07): 1455-1460.doi: 10.3866/PKU.WHXB20090737

研究论文 上一篇    下一篇

一种三叶草型氧化铝/碳纳米纤维复合材料的制备及表征

周静红, 韩伟伟, 隋志军, 郭蓉, 方向晨, 周兴贵   

  1. 华东理工大学化学工程联合国家重点实验室, 上海 200237|中国石油化工股份有限公司抚顺石油化工研究院, 辽宁 抚顺 113001
  • 收稿日期:2008-12-09 修回日期:2009-04-22 发布日期:2009-06-26
  • 通讯作者: 周兴贵 E-mail:xgzhou@ecust.edu.cn

Preparation and Characterization of Tri-Lobular Alumina/Carbon Nanofiber Composites

ZHOU Jing-Hong, HAN Wei-Wei, SUI Zhi-Jun, GUO Rong, FANG Xiang-Chen, ZHOU Xing-Gui   

  1. State Key Laboratory of Chemical Engineering, East China University of Science &|Technology, Shanghai 200237, P. R. China|Fushun Research Institute of Petroleum and Petrochemicals SINOPEC, Fushun 113001, Liaoning Province, P. R. China
  • Received:2008-12-09 Revised:2009-04-22 Published:2009-06-26
  • Contact: ZHOU Xing-Gui E-mail:xgzhou@ecust.edu.cn

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摘要：

采用催化化学气相沉积法, 以Ni为催化剂、乙烯作为碳源, 制备了三叶草型氧化铝/碳纳米纤维复合材料, 并通过N2物理吸附、扫描电子显微镜、X射线衍射分析和强度测试对氧化铝/碳纳米纤维复合材料的形貌和物理性能进行了表征. 结果表明, 三叶草型氧化铝表面生长了碳纳米纤维层, 两者紧密结合, 形成的氧化铝/碳纳米纤维复合材料具有较高的比表面积(>187 m2·g-1)和孔体积(>0.24 cm3·g-1), 孔道直径在3-10 nm 的孔体积超过总孔体积的85%, 颗粒的侧压强度大于6 N·mm-1, 可以满足工业催化剂载体对强度的要求. 复合材料是一种有良好的工业应用前景的中孔催化材料, 其中碳纳米纤维层的厚度可通过催化剂Ni负载量和生长时间的调节加以控制.

关键词: 氧化铝, 纳米碳纤维, 复合材料, 原位生长, 比表面积, 机械强度

Abstract:

A carbon nanofiber (CNF) covered alumina composite of tri-lobular shape was synthesized by catalytic chemical vapor deposition using Ni as catalyst and ethylene as carbon source. Its morphology and microstructure, textural and mechanical properties, and crystallinity were investigated using N2 physisorption, scanning electron microscopy, particle crushing strength measurement and X-ray diffraction. It was shown that the CNFs grown on the surface of the tri-lobular granule alumina had a high degree of graphitization, and the alumina substrate and the CNF layer were combined into a composite, which had a mesoporous structure and a surface area larger than 187 m2·g-1. The pore volume of the composite was larger than 0.24 cm3·g-1 and more than 85% of the pore volume corresponded to a pore size range between 3 and 10 nm. The side crushing strength of the composite satisfied the requirements for industrial catalyst supports. Therefore, the composite is very promising for industrial application.

Key words: Alumina, Carbon nanofiber, Composite, In-situ growth, Specific surface area, Mechanic property