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Single walled carbon nanohorn adsorptive material and method for production thereof

A technology of adsorption materials and manufacturing methods, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc.

Active Publication Date: 2006-07-19
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a carbon-based adsorbent for methane adsorption, single-walled carbon nanohorn (SWNH: singlewalled carbon nanohorn) has the above-mentioned characteristics. Compared with other carbon materials, SWNH can adsorb methane at a higher density, and it is expected to be an excellent methane adsorbent. But it is still slightly below the practical target (US Department of Energy: 35 atm, 150v / v), or limited to have the same degree of performance

Method used

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  • Single walled carbon nanohorn adsorptive material and method for production thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In an inert atmosphere, irradiate a solid carbon monomer with laser light to vaporize the carbon laser, and prepare a single-layer carbon nanohorn (SWNH) by the so-called laser ablation method, and suspend the single-layer carbon nanohorn in ethanol , and then add a certain amount of lanthanum nitrate ethanol solution, perform ultrasonic treatment for 5 minutes, evaporate and dry, and obtain a single-layer carbon nanohorn adsorption material loaded with lanthanum group metals. The lanthanoid elements used were La, Eu, Er, and Lu, and the supported amounts were 0.1 mmol per 1 g of SWNH. In addition, for comparison, the lanthanide metal treated in the same way was carried on the activated carbon fiber A10 by the same method as above. In addition, the lanthanoid element supported on the activated carbon fiber A10 was Eu, and the supported amount of the lanthanoid metal was 0.1 mmol per 1 g of A10.

[0028] Nitrogen adsorption measurement was performed at 77K to confirm th...

Embodiment 2

[0034]Next, the single-layer carbon nanohorn (SWNH) manufactured by laser ablation method was oxidized under oxygen flow at 693K, then suspended in ethanol, and then, a certain amount of ethanol solution of lanthanum nitrate was added, and ultrasonication was carried out for 5 minutes. After treatment, evaporate to dryness. The lanthanoid element used was Eu, and the supported amount was 0.1 mmol per 1 g of SWNH. For comparison, the methane adsorption density of a substance obtained by oxidizing SWNH in an oxygen flow at 693K was also measured. The results are shown in Table 2 and Figure 4 shown.

[0035] sample

Surface area (m 2 g -1 )

Pore ​​capacity (mLg -1 )

SWNH-ox

1010

0.47

Eu / SWNH-ox

780

0.33

[0036] In this case, as shown in Table 2, there is a certain decrease in the pore capacity due to the loading of Eu, but from Figure 4 It can be seen that the methane adsorption density increases.

[0037]...

Embodiment 3

[0039] Suspend SWNH produced by laser ablation in ethanol, add a certain amount of ethanol solution of lanthanum nitrate elements, perform ultrasonic treatment for 5 minutes, and evaporate to dryness. Afterwards, the sample was pelletized in a pellet former. The lanthanoid element used was Eu, and the supported amount was 0.1 mmol per 1 g of SWNH. The results of measuring their methane adsorption capacity are as follows: Figure 5 shown. In addition, for comparison, samples were prepared by suspending SWNH produced by laser ablation in ethanol and granulating with a particle former. from Figure 5 It can be seen that in this case, the methane adsorption amount of Eu-loaded SWNH particles is increased by about 1.5 times compared with the case of normal SWNH particles.

[0040] As described in detail above, according to the invention of the present application, a single-layer carbon nanohorn adsorbent effective as a methane adsorbent having a large amount of methane adsorbed...

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Abstract

A single walled carbon nanohorn adsorptive material which comprises a single walled carbon nanohorn and a lanthanide metal supported thereon, and has the adsorptivity for methane. The single walled carbon nanohorn adsorptive material can adsorb much methane and is effective as a methane adsorbing material.

Description

technical field [0001] The invention of the present application relates to a single-layer carbon nanohorn adsorption material and a manufacturing method thereof. More specifically, the invention of the present application relates to a single-layer carbon nanohorn adsorbent having a large amount of methane adsorption and being effective as a methane adsorbent, and a method for producing the same. Background technique [0002] The single-walled carbon nanohorn has a conical shape in which the front end of the tubular single-walled carbon nanotube protrudes into a horn shape, and is mainly composed of a carbon atom plane of a graphite structure like the carbon nanotube. The single-layer carbon nanohorn is usually assembled into a spherical shape with a diameter of about 80-100 nm by making the horn-shaped front end of a plurality of single-layer carbon nano-horn face outwards to form a so-called dahlia-shaped carbon nano-horn aggregate. Nanohorn aggregates have a very large su...

Claims

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Application Information

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IPC IPC(8): B01J20/20C01B31/02B82B1/00B82B3/00
CPCB82Y30/00B01J20/20B82Y40/00Y10S977/742B01J20/0207B01J20/205B01J20/3234Y10T428/30C01B31/0293C01B32/18
Inventor 饭岛澄男村田克之金子克美汤田坂雅子
Owner NEC CORP
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