Recent advances in the production of carbon nanotubes （CNTs） are reviewed with an emphasis on the use of carbon dioxide （CO2） as a sole source of carbon. Compared to the most widely used carbon precursors such as ...Recent advances in the production of carbon nanotubes （CNTs） are reviewed with an emphasis on the use of carbon dioxide （CO2） as a sole source of carbon. Compared to the most widely used carbon precursors such as graphite, methane, acetylene, ethanol, ethylene, and coal-derived hydrocarbons, CO2 is competitively cheaper with relatively high carbon yield content. However, CNT synthesis from CO2 is a newly emerging technology, and hence it needs to be ex- plored further. A theoretical and analytical comparison of the cur- rently existing CNT-CO2 synthesis techniques is given including a review of some of the process parameters （i.e., temperature, pres- sure, catalyst, etc.） that affect the CO2 reduction rate. Such analysis indicates that there is still a fundamental need to further explore the following aspects so as to realize the full potential of CO2 based CNT technology： （1） the CNT-CO2 synthesis and formation mechanism, （2） catalytic effects of transitional metals and mechanisms, （3） uti- lization of metallocenes in the CNT-CO2 reactions, （4） applicability of ferrite-organometallic compounds in the CNT-CO2 synthesis reactions, and （5） the effects of process parameters such as temperature, etc.展开更多
文摘Recent advances in the production of carbon nanotubes （CNTs） are reviewed with an emphasis on the use of carbon dioxide （CO2） as a sole source of carbon. Compared to the most widely used carbon precursors such as graphite, methane, acetylene, ethanol, ethylene, and coal-derived hydrocarbons, CO2 is competitively cheaper with relatively high carbon yield content. However, CNT synthesis from CO2 is a newly emerging technology, and hence it needs to be ex- plored further. A theoretical and analytical comparison of the cur- rently existing CNT-CO2 synthesis techniques is given including a review of some of the process parameters （i.e., temperature, pres- sure, catalyst, etc.） that affect the CO2 reduction rate. Such analysis indicates that there is still a fundamental need to further explore the following aspects so as to realize the full potential of CO2 based CNT technology： （1） the CNT-CO2 synthesis and formation mechanism, （2） catalytic effects of transitional metals and mechanisms, （3） uti- lization of metallocenes in the CNT-CO2 reactions, （4） applicability of ferrite-organometallic compounds in the CNT-CO2 synthesis reactions, and （5） the effects of process parameters such as temperature, etc.
