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CO2 Enhanced Carbon Nanotube Synthesis from Pyrolysis of Hydrocarbons

 An iron nitrate

hydrate (Fe(NO3)3·9H2O) and ammonium molybdate ((NH4)6Mo7O24·4H2O) solution

with MgO powder was ultrasonicated to form a gel, dried at 110 oC, ground to a fine

powder, and then calcined at 500 oC for 3 hours. The weight ratio of Fe/Mo/MgO in the

catalyst was 1:1:40. Around 100 mg of the catalyst was uniformly spread into a thin layer

under argon flow at 200 mL/min on a graphite susceptor and placed at the center of a

quartz tube positioned horizontally inside an inductive furnace. After purging the system

with argon as carrier gas for 10 minutes, radio frequency (RF) heating at 350 kHz was

applied to the graphite susceptor that contains the catalyst. The catalyst was first reduced with hydrogen (20 mL/min) at 720 oC for 30 minutes.