【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30 min,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60 nm,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106.2 m2/g;比孔容积略有减小,出现了一类较小的中孔(1.6~2.1 nm)结构.更多还原

【Abstract】 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 ～60nm,and entangled each other.Compared to the bare δ,θ-Al2O3,the BET surface area of CNTs-alumina composites increased from 82.1 m2/g to 106.2 m2/g,the pore volume of composite slightly decreased,moreover,a new smaller mesopore(1.6~2.1 nm) appeared.更多还原