用作催化剂载体的碳纳米管-氧化铝复合材料的制备  

Preparation of CNTs-alumina composites used catalyst support

作　　者：林磊[1] 王榕[1] 林炳裕[1] 黄勤[1] 魏可镁[1] 

机构地区：[1]福州大学化肥催化剂国家工程研究中心,福建福州350002

出　　处：《福州大学学报（自然科学版）》2009年第2期277-285,共9页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20576021);国家科技支撑计划资助项目(2007BAE08B02);福建省科技重大专项资助项目(2005HZ01)

摘　　要：用负载有Ni—Cu双活性金属的δ，θ-Al2O3作为催化剂，考察以化学气相沉积法合成碳纳米管-氧化铝复合材料的制备条件．实验表明，在Ni—Cu活性组分负载量为10‰（质量分数），Ni：Cu=4：1（质量比），反应温度730℃、反应气组分为C2H2：H2=25：75条件下反应30min，所生成的碳纳米管最好，得碳率可达15．7％．采用XRD、TGA／DTG等方法对生成的CNTs和复合材料的结构进行表征．结果表明：在所合成的碳纳米管-氧化铝复合材料中，碳纳米管在氧化铝载体的表面呈均匀覆盖，管径大小均匀，其外径约为60nm，而且碳纳米管间相互缠绕．与δ，θ-Al2O3基体相比，复合材料的比表面积由82．1增加到106．2m^2／g；比孔容积略有减小，出现了一类较小的中孔（1．6—2．1nm）结构．The preparation conditions of CNTs - alumina composites, which were synthesized by CVD using the Ni - Cu dual active metal supported on δ,θ-Al2O3 as catalysts, were investigated. The results showed that the most graphitization degree of CNTs was obtained using the total Ni and Cu metal loading of 10 wt‰, Ni： Cu =4：1 （mass ratio）with the reaction stream of C2H2： H2 =25：75 at 730 ℃ for 30 min, and the carbon yield can reach up to about 15.7%. The CNTs and CNTs-alumina composites were characterized by XRD, TGA/DTG, SEM and N2 physisorption. The results showed that in the composites the CNTs were distributed uniformly on the surface of alumina. The CNTs tubes had uniform external diameter of - 60 nm, and entangled each other. Compared to the bare δ,θ-Al2O3, the BET surface area of CNTs - alumina composites increased from 82. 1 m^2/g to 106.2 m^2/g, the pore volume of composite slightly decreased, moreover, a new smaller mesopore （1.6 - 2.1 nm） appeared.

关 键 词：碳纳米管 化学气相沉积法 δ θ-Al2O3 复合材料 催化剂载体 

分 类 号：O643[理学—物理化学]