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Method for catalyzing and synthesizing spiral carbon nano material by using water-soluble alkali metal carbonate

A technology of alkali metal carbonate and carbon nanomaterials, applied in chemical instruments and methods, nanotechnology, physical/chemical process catalysts, etc. structure and other problems, to achieve the effect of saving raw material costs, saving purification costs, and being conducive to large-scale production

Inactive Publication Date: 2012-03-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal nanoparticles will be wrapped in carbon nanomaterials and are difficult to remove
In order to remove these catalysts, concentrated acid heat treatment is often used, which not only consumes a lot of manpower, material resources and a lot of time, but also damages the structure of carbon nanomaterials, affects the performance of carbon nanomaterials, and seriously restricts the application of carbon nanomaterials.

Method used

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  • Method for catalyzing and synthesizing spiral carbon nano material by using water-soluble alkali metal carbonate
  • Method for catalyzing and synthesizing spiral carbon nano material by using water-soluble alkali metal carbonate
  • Method for catalyzing and synthesizing spiral carbon nano material by using water-soluble alkali metal carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] step 1 Weigh 0.05 mol NaOH (solid), 0.05 mol KOH (solid) and 0.05 mol citric acid dissolved in 200 mL absolute ethanol, at 60 ° Continue stirring for 6 hours at C temperature to form a uniform transparent sol; 80 o C is evaporated and dehydrated until white powder; the powder is placed in a muffle furnace under an air atmosphere at 600 o C was precalcined for 4 hours to obtain a catalyst precursor.

[0021] step 2 Weigh 0.10 g of the catalyst precursor and spread it flat in a ceramic ark with a width of 3 cm and a length of 6 cm. Place the ark in a quartz reactor with an inner diameter of 6cm and a length of 80cm, and then place the quartz reactor horizontally in the tube furnace so that the ark is just placed in the middle of the tube furnace (where the thermocouple for temperature measurement is located).

[0022] step 3 Helium was introduced into the reactor to 5 ° The temperature was raised to 450 °C at a rate of C / min, and the temperature was maintained ...

Embodiment 2

[0026] step 1 Same as embodiment 1, step 1.

[0027] step 2 Same as embodiment 1, step 2.

[0028] step 3 Helium was introduced into the reactor to 5 ° The temperature was raised to 400 °C at a rate of C / min, and the temperature was maintained for 1 hour. The hydrogen gas was turned off, and the acetylene gas was switched immediately, and the reaction was carried out at 400 °C for 6 hours. Get a lot of black spiral carbon nanomaterials in the ark. The appearance of the product is attached figure 2 .

[0029] Substituting the absolute ethanol in step 1 for isopropanol gave similar results.

[0030]Similar results were obtained by replacing 0.05 mol NaOH (solid) and 0.05 mol KOH (solid) in step 1 with 0.02 mol NaOH (solid base) and 0.02 mol KOH (solid).

[0031] NaOH or KOH solution with mass concentration above 95% can also be used as raw material.

Embodiment 3

[0033] step 1 Same as embodiment 1, step 1.

[0034] step 2 Same as embodiment 1, step 2.

[0035] step 3 Helium was introduced into the reactor to 5 ° The temperature was raised to 500 °C at a rate of C / min, and the temperature was maintained for 1 hour. The hydrogen gas was turned off, and the acetylene gas was switched immediately, and the reaction was carried out at 500 °C for 6 hours. Get a lot of black spiral carbon nanomaterials in the ark. The appearance of the product is attached image 3 .

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Abstract

The invention discloses a method for catalyzing and synthesizing a spiral carbon nano material by using water-soluble alkali metal carbonate. The method comprises the following steps of: synthesizing a catalyst precursor; putting the catalyst precursor into a tubular reactor in which temperature can be precisely controlled, feeding helium and thermally treating the catalyst precursor to obtain catalyst alkali metal carbonate nano particles, wherein the thermal treatment temperature is between 400 and 600 DEG C and the thermal treatment time is 3 to 10 hours; after thermal treatment, stopping feeding the helium, then feeding acetylene gas immediately, and catalyzing and splitting the acetylene on the surfaces of the catalyst alkali metal carbonate nano particles, wherein the reaction temperature is between 400 and 600 DEG C and the reaction time is 3 to 8 hours; and thus obtaining the black spiral carbon nano material. In the method, the adopted catalyst is the water-soluble alkali metal carbonate, so the water-soluble alkali metal carbonate can be washed away conveniently and the pure spiral carbon nano material can be obtained; furthermore, the method is environment-friendly and pollution-free; and preparation process and equipment are simple, the reaction temperature is low, the cost is low and large-scale production can be realized.

Description

technical field [0001] The present invention relates to a new method for synthesizing nanomaterials. A water-soluble alkali metal carbonate is used as a catalyst to synthesize a helical carbon nanomaterial. Since the catalyst is soluble in water, it can be easily removed from the helical carbon nanomaterial. Obtain pure carbon nanomaterials. Background technique [0002] In recent years, one-dimensional carbon nanomaterials (such as carbon nanotubes, nanofibers, nanohelices, etc.) have received widespread attention. These carbon nanomaterials have many potential applications, such as for hydrogen storage materials, electromagnetic wave absorption, electrode materials, field emission devices, fuel cells, etc. The preparation methods currently reported in the literature mainly rely on doping sulfur and other impurities in the catalyst, and introducing sulfur-containing gases (such as thiophene), or nano-copper single crystals obtained by modifying chiral reagent tartaric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00B01J27/232
Inventor 钟伟祁小四都有为
Owner NANJING UNIV
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