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Catalyst for growth of carbon nano-tube, and its prepn. method

A carbon nanotube and catalyst technology, which is applied in the field of carbon nanotube growth catalyst and its preparation, can solve the problems of uneven distribution of thickness, low carbon nanotube yield, and difficulty in controlling the particle size distribution and size of metal particles.

Inactive Publication Date: 2006-01-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Literature [1] A.Thaib, G.A.Martin, P.Pinheiro, M.C.Schouler and P.Gadelle, Catalysis Letters 63 (1999) 135 and literature [2] J.P.Pinheiro, M.C.Schouler, P.Gadelle, Carbon 41 (2003) 2949 both Preparation of different supported metal catalysts Co / Al with transition metal element Co as the active component 2 o 3 And Co / MgO, synthesized carbon nanotubes with different lengths, tube diameters, and crystallization degrees, but due to the dispersion of active components during loading and the difficulty in controlling the particle size distribution and size of the final metal particles, there are carbon nanotubes synthesized. Low yield of nanotubes and defects of non-uniform thickness distribution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 11.29g Co(NO 3 ) 2 ·6H 2 O and 8.478g Al(NO 3 ) 3 9H 2 O was added to 50ml of deionized water to prepare a salt solution; 4.79g of NaCO 3 and 3.93g NaOH were added into 50ml deionized water to prepare an alkaline solution.

[0022] Under the condition of stirring at 25°C, slowly add the alkali solution dropwise to the salt solution until the pH is 10, and then crystallize in a water bath at 50°C for 12 hours. dry.

[0023]The hydrotalcite precursor prepared above was placed in a muffle furnace, and the temperature was raised to 600°C at a rate of 5°C / min, kept for 4 hours, and finally cooled to room temperature with the furnace to obtain a catalyst sample.

[0024] Low-temperature nitrogen adsorption and desorption test, the average pore diameter of mesopores is 2.3nm, the average pore diameter of micropores is 1.5nm, the average pore diameter is 43nm, and the total pore volume is 0.605cm 3 / g, the specific surface area is 131.3m 2 / g; After the catalyst is red...

Embodiment 2

[0028] Weigh 11.64g Co(NO 3 ) 2 ·6H 2 O, 2.69g Fe(NO 3 ) 3 9H 2 O and 2.50g Al(NO 3 ) 3 9H 2 O was added to 50ml deionized water to prepare a salt solution; use 2.83g NaCO 3 , 3.42g NaOH and 50ml deionized water to prepare an alkaline solution.

[0029] Under the condition of stirring at 25°C, slowly add the lye into the salt solution dropwise until the pH is 9, then crystallize in a water bath at 40°C for 8 hours, filter with suction after the reaction, and wash twice with deionized water. Air dry. The hydrotalcite precursor prepared above was placed in a muffle furnace, and the temperature was raised to 700°C at a rate of 3°C / min, kept for 5h, and finally cooled to room temperature with the furnace to obtain a catalyst sample.

[0030] Low-temperature nitrogen adsorption and desorption test, the average pore diameter of mesopores is 3.5nm, the average pore diameter of micropores is 1.7nm, the average pore diameter is 51nm, and the total pore volume is 0.632cm 3 / g...

Embodiment 3

[0033] 10.51g NiSO 4 ·6H 2 O, 3.71g FeSO 4 ·7H 2 O and 8.88g Al 2 (SO 4 ) 3 18H 2 O was added to 100ml deionized water to prepare a salt solution; 14.20g Na 2 SO 4 and 6.00g NaOH was added to 100ml by N 2 Prepare the alkaline solution in deionized water.

[0034] Under the protection of nitrogen, under the condition of stirring at 25°C, under the condition of stirring at 25°C, slowly add the lye into the salt solution dropwise until the pH is 8; 2 Under protected conditions, crystallize in a water bath at 20°C for 24 hours, filter with suction after the reaction, and use N 2 washed with ice water, and finally washed twice with ethanol, and dried in air. The hydrotalcite precursor prepared above was placed in a muffle furnace, and the temperature was raised to 800°C at a rate of 10°C / min, kept for 5 hours, and finally cooled to room temperature with the furnace to obtain a catalyst sample.

[0035] Low-temperature nitrogen adsorption and desorption test The average ...

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Abstract

A catalyst for growing the carbon nanotubes with 16-28 layers of smooth wall, 20-40 nm in diameter and 4-15 microns in average length is prepared through introducing its active component to the laminated hydrotalcite to obtain the precursor, calcining to obtain the composite oxide with spinel structure, and reducing before it is used to obtain granular catalyst.

Description

Technical field: [0001] The invention relates to a catalyst for growing carbon nanotubes and a preparation method thereof. technical background: [0002] Carbon nanotubes are a new type of functional material with a one-dimensional tubular molecular structure. With its special structure, it shows extremely strong quantum effects and singular physical and chemical properties. It is used in catalysis, composite materials, energy storage materials and microelectronic devices. Many fields have shown great potential application prospects. Carbon nanotubes are seamless nanoscale tubes formed by single-layer or multi-layer graphite sheets curled around the central axis at a certain helix angle. According to different preparation methods and conditions, carbon nanotubes exist in multi-walled carbon nanotubes (MWNTs) and Single-walled carbon nanotubes (SWNTs) come in two forms. [0003] At present, the methods for preparing carbon nanotubes include graphite arc method, laser evapor...

Claims

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Application Information

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IPC IPC(8): B01J23/70B01J37/03C01B31/02
CPCC01B2202/34B01J35/1042B01J23/70C01P2002/32B01J23/75B01J23/007C01B31/0233B01J35/10B01J35/1066C01B2202/36B82Y40/00B01J35/1057B01J35/006B01J35/1061B82Y30/00C01B32/162B01J35/393B01J35/60B01J35/643B01J35/651B01J35/635B01J35/647
Inventor 段雪李峰谭茜
Owner BEIJING UNIV OF CHEM TECH
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