摘要
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.
出处
《洁净煤技术》
CAS
2013年第2期59-62,共4页
Clean Coal Technology
基金
江苏省自然科学基金资助项目(BK2012851)
关键词
模拟沼气
镍基催化剂
碳纳米管
催化裂解
simulated methane
Ni-based catalyst
carbon nanotubes
catalytic cracking
