%0 Journal Article
%T 模拟沼气催化裂解制备碳纳米管的实验研究
%A 张居兵
%A 朴桂林
%A 王冬冬
%A 谢浩
%A 陈丽芳
%J 洁净煤技术
%D 2013
%X 利用自制96%Ni基催化剂,在固定床上对模拟沼气催化裂解制备碳纳米管进行实验研究。分析不同混合气、反应温度、CO2浓度对碳析出率及析出产物形貌特征的影响。实验结果表明:在CH4浓度同为60%的条件下,当反应温度为500～680℃时,由于受到CO2的消碳作用,CH4/CO2催化裂解碳析出率明显低于CH4/N2;当温度为680～900℃时,CO2的影响基本消除。随着CO2浓度的提高,碳析出率逐渐降低,在模拟沼气(60%CH4,40%CO2)条件下,最佳催化裂解温度为650℃,碳析出率达到215.2%。对样品进行SEM和TEM分析,结果显示用CH4/CO2和CH4/N2催化裂解得到的碳纳米管形貌特征基本类似,在低温条件下,有利于提高催化剂的使用寿命且可产生纯度更高的碳纳米材料。 Using 96 percent Ni-based catalyst,prepared carbon nanotubes(CNTs) by simulating biogas catalytic decomposition.The effects of gas component,temperature and CO2 concentration on catalytic decomposition were investigated in moving-bed.The results show that,carbon deposition rate of catalyst with CH4/CO2 is much lower than that of CH4/N2 from 500 ℃ to 680 ℃ because of carbon elimination activity from CO2,the influence is eliminated when reaction temperature is between 680 ℃ and 900 ℃.With the increase of CO2 concentration,carbon deposition rate decrease gradually.For simulated biogas(60 percent CH4,40 percent CO2),the most suitable decomposition temperature is 650 ℃,carbon deposition rate reaches 215.2 percent.The samples are characterized by SEM and TEM,the carbon nanotubes gained by CH4/CO2 and CH4/N2 are essentially similar.It is beneficial for improving the service life of catalyst,producing higher purity carbon nano material under low temperature condition
%K 模拟沼气
%K 镍基催化剂
%K 碳纳米管
%K 催化裂解 simulated methane
%K Ni-based catalyst
%K carbon nanotubes
%K catalytic cracking
%U http://www.jjmjs.com.cn/WKD/WebPublication/paperDigest.aspx?paperID=e9c6920e-5f47-4ae9-bfdd-b4e6dd936abf