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Carbon nanohorn adsorbent and process for producing the same

A technology of adsorption materials and manufacturing methods, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as high density, deterioration, lack of chemical stability, etc.

Inactive Publication Date: 2004-09-01
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, zeolite will deteriorate under the action of strong acid and alkali, lacks chemical stability, and has the disadvantage of high density and heavy

Method used

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  • Carbon nanohorn adsorbent and process for producing the same
  • Carbon nanohorn adsorbent and process for producing the same
  • Carbon nanohorn adsorbent and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A φ30×50mm graphite object rotating in a room temperature, 760Torr, Ar gas drying reaction chamber is irradiated with CO with a wavelength of 10.6μm by a beam with a diameter of 10mm. 2 Laser, and the resulting carbon nanotubes are recovered from the collection filter. The obtained carbonaceous nanotubes were assembled in a structure in which a plurality of carbonaceous nanotube tubular parts were located at the center and conical parts projected like horns on the surface, and it was a spherical single-layer carbon nanotube aggregate with a diameter of about 70 nm. The diameter of the tubular portion of each carbon nanotube is about 2 to 3 nm, and the length of the tubular portion is about 30 nm.

[0027] The carbon nanotubes were oxidized for 10 minutes under three conditions of an oxygen pressure of 760 torr and a treatment temperature of 300° C., 350° C., and 420° C. respectively. Take the untreated carbon nanotubes as NH0, and treat the treated carbon nanotubes as ...

Embodiment 2

[0037] The molecular sieve effects of NHO, NH300, NH350, and NH420 similar to those in Example 1 were investigated using molecules of various diameters.

[0038] As a molecule of a non-adsorbing substance, the molecular shape is basically spherical, and there are only dispersion forces between the molecules, that is, from the perspective of molecules without preferential intermolecular interactions, He, Ar, and N 2 、CH 4 , SF 6 and C 60 , and the diameters of these molecules are shown in Table 3 below.

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Abstract

A novel carbon nanohorn adsorbent which does not necessitate a high-temperature treatments lightweight and chemically stable, and can selectively adsorb molecules based on the molecular sieve effect; and a process for producing the adsorbent. The process comprises oxidizing a single-wall carbon nanohorn aggregate while controlling oxidative conditions to thereby obtain the carbon nanohorn adsorbent, which have, in the tubular parts, pores having a regulated diameter.

Description

technical field [0001] The invention relates to a carbon nanohorn adsorbent and a manufacturing method thereof. Specifically, it relates to a novel carbon nanotube adsorption material which is lightweight and chemically stable, and can selectively adsorb molecules through the molecular sieve effect, and a manufacturing method of the carbon nanotube adsorption material which does not require high temperature treatment. Background technique [0002] In the past, generally widely used carbonaceous adsorbent materials include activated carbon, activated fiber, and high specific surface area activated carbon, as shown in Table 2 on the following page. The shape of the pores formed in these carbonaceous adsorbent materials is the space between two slices ( Hereinafter referred to as "slit type"), its size is distributed in a wide range. Therefore, in order to meet the purpose of use, the shape of the pores and the distribution of the pore size are controlled by methods such as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J20/20B01J20/30
CPCC01B31/0293B01J20/20B01J20/28083B01J20/205B01J20/2808B82Y40/00B82Y30/00C01B32/18
Inventor 饭岛澄男汤田坂雅子小海文夫高桥邦充糟屋大介金子克美村田克之
Owner NEC CORP
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