The precursor for CNT (carbon nanotube) preparation is acetylene. This conclusion is based on the analysis that acetylene can directly serve as a precursor for carbon nanotube growth without the need for additional energy requirements or thermal conversion during synthesis. In contrast, methane and ethylene, which are other hydrocarbons, require thermal conversion processes to form direct carbon precursors, and these processes involve higher energy requirements compared to acetylene. Specifically, methane requires more energy than ethylene, which in turn requires more energy than acetylene to successfully synthesize carbon nanotubes. This difference in energy requirements is likely due to the varying kinetic energies needed for methane and ethylene to form direct carbon nanotube precursors during thermal conversion, with methane requiring the highest activation energy among the three hydrocarbons. These findings support the hypothesis that methane and ethylene can form acetylene by thermal conversion prior to its incorporation into carbon nanotubes, making acetylene the most efficient and direct precursor for CNT synthesis.
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