Bimetal oxide catalyst and method using it to prepare sigle-wall nano carbon tube whose diameter can be controlled
A technology of bimetallic oxide and carbon nanotubes, applied in the field of single-walled carbon nanotubes, can solve the problems of low yield due to the presence of large-walled carbon nanotubes, and achieve the effects of strong activity, high yield, and good stability
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Embodiment 1
[0013] Take ferric nitrate nonahydrate, magnesium nitrate hexahydrate, ammonium molybdate and citric acid equivalent to magnesium nitrate hexahydrate at a molar ratio of Fe: Mo: Mg 1:0.1:13, mix and dissolve in distilled water to form a transparent solution After the sol is formed, put it into a porcelain boat, use the combustion method, heat the sol in a muffle furnace at 550°C, and then bake it at this temperature for 10 minutes, take out the formed solid, cool it, and grind it finely. The carbon tubes were prepared in a fixed-bed gas continuous flow reactor. Put 0.103 grams of catalyst into the constant temperature zone in the middle section of the furnace, feed methane with a flow rate of 75 sccm and hydrogen gas with a flow rate of 300 sccm, control the reaction temperature at 1000 ° C, and react for 30 minutes to obtain 0.165 grams of single-walled carbon nanotubes. The Raman spectrum curve of the prepared single-walled carbon nanotubes is as follows figure 1 As shown, ...
Embodiment 2
[0015] Take nickel nitrate hexahydrate, magnesium nitrate hexahydrate, ammonium molybdate and citric acid equal to the amount of magnesium nitrate hexahydrate at a molar ratio of 2:0.1:13 Fe:Mo:Mg, mix and dissolve in distilled water to form a transparent solution , After forming a sol, put it into a porcelain boat, adopt the sol-gel method, put it into a drying oven at 120°C for 2 hours after forming a sol, transfer it to a porcelain boat after foaming, and then bake it in a muffle furnace at 550°C After 30 minutes, the solid formed was taken out, cooled and ground finely. The carbon tubes were prepared in a fixed-bed gas continuous flow reactor. Put 0.100 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a flow rate of 75 sccm and hydrogen gas with a flow rate of 300 sccm, control the reaction temperature at 1000° C., and react for 30 minutes to obtain 0.110 grams of single-walled carbon nanotubes. The transmission electron...
Embodiment 3
[0017] Take ferric nitrate nonahydrate, magnesium nitrate hexahydrate, ammonium molybdate and citric acid equivalent to the molar number of magnesium nitrate hexahydrate at a molar ratio of Fe: Mo: Mg of 1:0.5:13, mix and dissolve in distilled water to form a transparent solution, Using the sol-gel method, after forming a sol, put it in a drying oven at 120°C for 2 hours, transfer it to a porcelain boat after foaming, and then bake it in a muffle furnace at 650°C for 30 minutes, take out the formed solid and cool it Grind finely. The carbon tubes were prepared in a fixed-bed gas continuous flow reactor. Put 0.108 grams of catalyst into the constant temperature zone in the middle of the furnace, feed methane with a flow rate of 75 sccm and hydrogen with a flow rate of 300 sccm, control the reaction temperature at 1000 ° C, and react for 30 minutes to obtain 0.181 grams of single-walled carbon nanotubes. The diameter distribution of the single-wall carbon nanotubes prepared und...
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