Method of decomposing carbon dioxide and method of forming carbon-particle structure

• US 7,807,025 B2
• Filed: 05/25/2005
• Issued: 10/05/2010
• Est. Priority Date: 05/25/2004
• Status: Expired due to Fees

• Current Assignee: Toyo University Educational Foundation
• Original Assignee: Toyo University Educational Foundation
• Inventors: Yoshida, Yoshikazu, Fukuda, Takahiro, Maekawa, Toru
• Primary Examiner(s): Wong; Edna
• Application Number:
  US11/597,231
• Publication Number:
  US 20080210542A1
• Time in Patent Office: 1,959 Days
• Field of Search: 204/157.15, 204/157.41, 204/157.47, 204/157.5
• US Class Current: 204/157.41
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/007 by irradiation
• CPC Class Codes: B01J 19/121 Coherent waves, e.g. laser beams lasers per se H01S3/00
• CPC Class Codes: B01J 2219/0875 Gas
• CPC Class Codes: B01J 2219/0877 Liquid
• CPC Class Codes: B01J 3/008 Processes carried out under supercritical conditions
• CPC Class Codes: C01B 32/05 Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2
• CPC Class Codes: Y02P 20/54 using solvents, e.g. supercritical solvents or ionic liquids

Abstract

A method for realizing carbon dioxide reduction, which is a task to be urgently accomplished from the viewpoint of global environmental problems, is provided. The method includes the steps of irradiating carbon dioxide in a supercritical or subcritical state (i.e., near the critical point) with a UV-wavelength laser beam to decompose carbon dioxide and form a carbon-particle structure.

Claims

1. A method for decomposing carbon dioxide, comprising the step of irradiating opaque carbon dioxide near its critical point, as light is scattered, with a UV-wavelength laser beam to decompose the opaque carbon dioxide.

2. A method for decomposing carbon dioxide, comprising the steps of:

irradiating opaque carbon dioxide near its critical point, as light is scattered, with ultraviolet photons; and

colliding the ultraviolet photons with the carbon dioxide to decompose the opaque carbon dioxide.

3. A method for decomposing carbon dioxide, comprising the steps of:

irradiating large molecule clusters of carbon dioxide produced near its critical point, as light is scattered, with ultraviolet photons; and

colliding the ultraviolet photons with the carbon dioxide having large molecule clusters to decompose the carbon dioxide.

4. A method for decomposing carbon dioxide, comprising the steps of:

irradiating large molecule clusters of opaque carbon dioxide produced near its critical point, as light is scattered, with ultraviolet photons; and

colliding the ultraviolet photons with the opaque carbon dioxide having large molecule clusters to decompose the opaque carbon dioxide.