Study on the influence factors and purification of carbon nanotubes from methane catalytic cracking
The carbon nanotubes were produced by catalytic cracking of Fe series catalysts,which were prepared by immersion method.The relevant factors such as catalyst components,dosage,time and temperature were compared and investigated.The obtained carbon nanotubes were purified at the same temperature under the best conditions,and the samples were characterized by micromorphology and thermogravimetric analysis.The results show that the best preparation conditions are when the mass fraction of Fe catalyst is 50%,WHSV reaches 6 000～8 000 mL·h-1·g-1,and the pyrolysis temperature is 730℃.After the isothermal purification of carbon nanotubes,it is found that a large amount of impurity carbon is oxidized,the catalyst particles at the ports and nodes are released,wCNTs is increased by 16.4%,and the effect of purification is significant.
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