Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B32/00—Carbon; Compounds thereof
  • C01B32/15—Nano-sized carbon materials
  • C01B32/18—Nanoonions; Nanoscrolls; Nanohorns; Nanocones; Nanowalls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
  • B01J20/0207—Compounds of Sc, Y or Lanthanides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
  • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
  • B01J20/205—Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
  • B01J20/30—Processes for preparing, regenerating, or reactivating
  • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
  • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
  • B01J20/3234—Inorganic material layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B82—NANOTECHNOLOGY
  • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
  • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B82—NANOTECHNOLOGY
  • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
  • B82Y40/00—Manufacture or treatment of nanostructures
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S977/00—Nanotechnology
  • Y10S977/70—Nanostructure
  • Y10S977/734—Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc.
  • Y10S977/742—Carbon nanotubes, CNTs
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer

Definitions

• the invention of this application relates to a single layer carbon nanohorn adsorbent and a method for producing the same. More specifically, the invention of this application extends over single-walled carbon nanohorn adsorbents which have a large amount of adsorbed methane and which are effective as methane adsorbents and a method for producing the same.
• the tip of the tubular single-walled carbon nanotube has a conical shape that is pointed like a horn (horn), and like the single carbon nanotube, it is mainly composed of a carbon atom surface of graphite structure. ing.
• this single-layer carbon nanohorn is a so-called dry carbon nanohorn aggregate in which a large number of single-layer carbon nanohorns are gathered in a spherical shape with a diameter of about 80 to 100 nm with the angular tip end outside. It is expected to be used as a lightweight, low-cost adsorption material, as it is manufactured and its carbon nano-ho aggregate is very large in surface area and easy to synthesize in high purity.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2 0 2 0 1 5 9 8 5 1
• Patent Document 2 Japanese Patent Application Laid-Open No. 2 0 0 2-3 2 6 0 3 2
• methane which is a raw material of natural gas
• fuels such as coal and petroleum
• various storage methods of methane have been proposed.
• various carbon-based adsorbents such as activated carbon, activated carbon fiber, high specific surface area activated carbon, and metal complexes are expected as methane adsorbents.
• single-walled carbon nanohorns SWN H: siiigle walled carbon nano orn
• SWNH has a higher density than other carbon materials. It can be used to adsorb methane and is expected to be an excellent methane adsorbent, but it is currently targeted for practical use (US Department of Energy: 35 Pressure, slightly less than 150 v / v, or similar performance.
• An object of the present invention is to provide a single-layer carbon nanohorn adsorbent useful as Disclosure of Invention--------
• a single-layer carbon nanohorn adsorption is characterized in that a lanthanide metal is supported on a single-layer carbon nanohorn, and is characterized by having methane adsorbability.
• lanthanide metal is supported on a single-layer carbon nanohorn at a loading amount of not less than 0.10 mm o 1 and not more than 5 mm o 1 per 1 g of single-layer force one-carbon nanohorn
• the present invention provides a single-walled carbon nanohorn adsorbent characterized in that
• the lanthanide metal is any one of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd and Tb. Single layer carbon nanohorn adsorption material.
• single-walled carbon nanohorns are suspended in ethanol, then a predetermined amount of lanthanide nitrate ethanol solution is added, and after ultrasonication, the lanthanide metal is converted to single-walled carbon nanohorns by evaporation to dryness.
• Single layer force one point special feature to support
• the present invention provides a method of producing a nano horn adsorbent.
• FIG. 1 is a graph showing the difference in adsorption density of methane according to the atomic number of the lanthanum metal of the single-walled carbon nanohorn adsorbent of the invention of this application.
• FIG. 2 is a graph showing the measurement results of the adsorbed methane density of the single layer nano-carbon nanohorn adsorbent, the conventional single-layer carbon nanohorn and the activated carbon fiber of the present invention.
• FIG. 3 is a bar graph showing the results of measuring the adsorbed methane density of the single-walled carbon nanohorn adsorbent of the invention of the present application, a conventional single-walled carbon nanohorn and activated carbon fibers, and other carbon materials.
• FIG. 4 is a graph showing the adsorbed methane density of SWNH and Eu / SWNH- o X in the example of the present invention.
• FIG. 5 is a graph showing the adsorption amount of methane of SWNH pellet and EuZ SWNH-ox pellet in the example of the present invention.
• Fig. 6 is a graph showing the amount of adsorption of methane of conventional SWNH (heated ⁇ not heated), activated carbon fiber, and activated carbon.
• the single-walled carbon nanohorn adsorbent of the invention of this application is characterized in that the lanthanide metal is supported on the single-walled carbon nanohorn, and it is a great feature that it has methane adsorbability.
• a single layer force one carbon nano horn adsorbent can increase the adsorption amount of methane significantly as compared with a conventional single layer carbon nano horn, and in particular, it can reduce 0.10 mm per 1 g of single layer carbon nano horn. o 1 to 5 mm o 1
• the loading amount of the following is preferable. By loading the lanthanide metal onto the single layer carbon nanohorn by such a loading amount, the methane adsorption amount of the single layer carbon nanohorn adsorbent is further improved. It becomes possible.
• the methane adsorbed on the single-walled carbon nano-horn adsorption material on which the lanthanide metal is supported can be easily and quickly released from the single-wall carbon nano-horn adsorption material simply by reducing the pressure.
• a single-layer carbon nanohorn is suspended in ethanol, then a predetermined amount of an lanthanide nitrate ethanolic acid solution is added, ultrasonicated, and evaporated to dryness.
• the lanthanide metal can be suitably produced by a method in which the lanthanide metal is supported on the single layer carbon nanohorn, and further, the single layer carbon nanohorn is heated and oxidized in an oxygen stream before being suspended in ethanol.
• the single layer force one carbon nanohorn having a supported lanthanide metal supported by heating / oxidation is an adsorption methane density which is lanthanide without heating / oxidation. It is smaller than metal-supported single-layer single-wall nanohorns, but the amount of methane adsorbed as a whole is increased. It is possible to
• the single-walled carbon nanohorn (SWNH 2) in the invention of this application is generally produced as an aggregate
• the lanthanide metal may be supported on the single-walled carbon nanohorn of this aggregate. Each is supported by a single carbon nanohorn It is also good.
• SWNH Single-layer carbon nanohorns prepared by the so-called laser ablation method in which a solid carbon simple substance is irradiated with a laser beam in an inert gas atmosphere and evaporated by a carbon laser are suspended in ethanol. Then, a predetermined amount of a lanthanide nitrate ethanol solution was added, and after 5 minutes of sonication (sonication), evaporation to dryness was carried out to obtain a single-layer carbon nanohorn adsorbent having a lanthanide metal supported thereon.
• the lanthanides used were La, Eu, Er and Lu, and the loadings were ⁇ ⁇ 1 mm ⁇ ⁇ ⁇ 1 per 1 g SWNH, respectively.
• the activated carbon fiber A10 was subjected to the same treatment to support the lanthanide metal.
• the amount of lanthanide supported on the activated carbon fiber A10 was ⁇ , and the amount of lanthanide metal supported was 0.1 mm o 1 per 1 g of A 10.
• each carbon material was confirmed by nitrogen adsorption measurement at 77 K. As shown in Table 1, almost no change in pore volume was observed with the supported lanthanum metal. Also, the surface area was hardly changed.
• SWNH a product obtained by oxidizing SWNH at high temperature (S WNH—ox in FIG. 3), S WNH supporting a lanthanide metal (L aZSWNH, E u / SWNH, E r in FIG.
• L aZSWNH, E u / SWNH, E r in FIG. The measurement results of the adsorbed methane density of (SWZ NH, Lu / SWNH) and lanthanide metal supported and oxidized at a high temperature (E uZSWNH- ox) are shown.
• SWNH single layer single carbon nano horn
• a single layer single carbon nano horn (SWNH) prepared by a laser ablation method is oxidized at 693 K under oxygen flow, and then suspended in ethanol, and then a predetermined amount of lanthanide nitrate is added.
• the ethanol solution was added, sonicated for 5 minutes and then evaporated to dryness.
• the lanthanide used is Eu and the loading is 0.1 lmol / g SW NH.
• the adsorbed methane density of SWNH oxidized at 693 K under oxygen flow was also measured. The results are shown in Table 2 and Figure 4. Table 2 In this case, as shown in Table 2, although the pore volume was slightly reduced by Eu loading, it can be seen from FIG. 4 that the density of adsorbed methane was increased.
• the SWNH prepared by the laser ablation method was suspended in ethanol, a predetermined amount of ethanol solution of lanthanide nitrate was added, sonicated for 5 minutes, and then evaporated to dryness. After that, the sample was pelletized with a pelletizer.
• the lanthanide used is Eu and the loading is 0.1 mmo / g of SWNH.
• the results of measuring the adsorbed amount of methane are shown in FIG.
• SWNH prepared by the laser ablation method was suspended in ethanol, and a pelletized sample was prepared using a pelletizer. It can be seen from FIG. 5 that, also in this case, the methane adsorption amount of SWNH pellets loaded with Eu increased approximately 1.5 times as compared with the case of ordinary SWNH pellets.
• the invention of this application provides a single-layer carbon nanohorn adsorbent having a large amount of adsorbed methane and which is effective as a methane adsorbent, and a method for producing the same.

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• 2003
  • 2003-06-18 JP JP2003174016A patent/JP4394383B2/ja not_active Expired - Lifetime
• 2004
  • 2004-05-31 US US10/560,808 patent/US8007908B2/en active Active
  • 2004-05-31 WO PCT/JP2004/007848 patent/WO2004112955A1/ja not_active Ceased
  • 2004-05-31 CN CNB2004800168539A patent/CN100435933C/zh not_active Expired - Lifetime
  • 2004-05-31 EP EP04745618A patent/EP1637223A4/en not_active Withdrawn

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