Catalyst and method for preparing nanometer carbon tube
A carbon nanotube and catalyst technology, which is applied in the field of catalysts for preparing carbon nanotubes, can solve the problems of high reaction temperature, low carbon nanotube yield, influence on carbon nanotube yield, quality microstructure, etc., and achieves low cost and high yield. High, easy-to-use effect
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Embodiment 1
[0022] Weigh nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O, the same below] 1.940g, magnesium nitrate [Mg(NO 3 ) 2 ·6H 2 O, the same below] 2.560g, citric acid 2.250g, fully dissolved in 20ml of water by stirring, evaporated the solution in a boiling water bath to a viscous state, transferred the paste to a beaker, put it in an oven and dried it overnight at 373K, and dried the obtained The sample was transferred to a crucible, and baked in a muffle furnace at 673K for 300 minutes to obtain a catalyst precursor, which was reduced to a catalyst by hydrogen, wherein the percentage of Ni was 50%.
[0023] Weigh 47 mg of the catalyst precursor prepared above, put it into a horizontal quartz tube reactor, and purge it with nitrogen for 30 minutes at 423 K, and switch to H2 with a flow rate of 30 ml / min. 2 , H 2 In the atmosphere, the temperature is raised to 673K, and after maintaining for 60 minutes, the temperature is raised to 973K, and the temperature is switched to C with a flow...
Embodiment 2
[0025] The catalyst and its preparation process are the same as in Example 1. After the catalyst is reduced, the temperature is raised to 973K, and the flow rate is 30ml / min. 4 , the reaction was stopped after 90 minutes, and the product was collected. The product was subjected to 1% HNO 3 The solution was washed, washed with water, dried, and weighed to obtain 103 mg of carbon nanotubes, with a yield of 1.5 g / g.
Embodiment 3
[0027] Take by weighing nickel nitrate 2.910g, magnesium nitrate 2.420g, copper nitrate [Cu(NO 3 ) 2 ·3H 2 O, the same below] 0.0739g, 2.702g of citric acid, fully dissolved in 20ml of water by stirring, evaporated in a boiling water bath until the solution became viscous, transferred the paste to a beaker, and dried overnight at 373K in an oven. The dried obtained sample is transferred to a crucible, and roasted at 623K for 240 minutes in a muffle furnace to obtain a catalyst precursor, which is reduced to a catalyst of the present invention, wherein the percentage of nickel is 60%, and the percentage of Cu is 2 %.
[0028] Weigh 143 mg of the catalyst precursor prepared above, put it into a horizontal quartz tube reactor, and purge it with nitrogen for 30 minutes at 423 K, and then switch to H with a flow rate of 30 ml / min. 2 , H 2 Raise the temperature to 623K in the atmosphere, keep it for 60 minutes, then raise the temperature to 1073K, switch to CH with a flow rate o...
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