Method of reducing NOx

• US 6,651,565 B1
• Filed: 12/20/1999
• Issued: 11/25/2003
• Est. Priority Date: 04/20/1998
• Status: Expired due to Term

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: Yamazaki, Masayuki, Yamato, Yo
• Primary Examiner(s): Miller, Edward A.
• Application Number:
  US09/446,313
• Time in Patent Office: 1,436 Days
• Field of Search: 149/19.1, 149/36, 149/46, 149/61, 149/108.4, 280/741, 102/531
• US Class Current: 102/531
• CPC Class Codes: B01D 53/56 Nitrogen oxides B01D53/60 takes precedence
• CPC Class Codes: B01D 53/565 by treating the gases with solids
• CPC Class Codes: B01D 53/8631 Processes characterised by a specific device
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: C06B 23/02 for neutralising poisonous gases from explosives produced during blasting
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

A method capable of decreasing the amount of NOx generated by the combustion of a gas generating agent for an air bag.

A method for reducing NOx generated by the combustion of a gas generating agent of an air bag by a reducing material placed inside an inflator and decreasing its amount. NH₂ radical, or the like, is generated by the decomposition of the reducing material. The radical is allowed to react with NOx and a part of NOx is changed to the N₂ gas. Thus, the amount of NOx is decreased.

Claims

1. A method of reducing NOx, the method comprising:

burning a gas generating agent to produce a combustion gas including NOx inside an inflator for an air bag, the inflator comprising an ignition means, a gas generating agent, a partition plate and a coolant/filter; and

contacting the NOx with a reducing material comprising 5-aminotetrazole,

wherein the gas generating agent and the partition plate are accommodated in a combustion chamber, and the gas generating agent and the reducing material are separated by the partition plate.

2. The method according to claim 1, wherein said reducing material is in the proximity of a gas outlet from an ignition means accommodation chamber.

3. The method according to claim 1, wherein said reducing material further comprises copper oxide.

4. The method according to claim 1, wherein said reducing material is molded into an article.

5. The method according to claim 1, wherein said partition plate prevents said gas generating agent and said reducing material from mixing with each other to such an extent as to affect the NOx reducing effect.

6. The method according to claim 1, wherein said partition plate does not affect a reaction of said reducing agent with said NOx.

7. The method according to claim 1, wherein said partition plate is made of a metal or a plastic.

8. The method according to claim 1, wherein said partition plate is made of aluminum or silicon.