NOx reducing method

• US 20040060469A1
• Filed: 09/30/2003
• Published: 04/01/2004
• Est. Priority Date: 04/20/1998
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: Yamazaki, Masayuki, Yamato, Yo
• Application Number:
  US10/673,419
• Publication Number:
  US 20040060469A1
• Time in Patent Office: Days
• US Class Current: 102/430
• 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. An inflator comprising a gas generating agent, a reducing material, an ignition means, and a coolant/filter.

2. An inflator according to claim 1, which further comprises means for preventing the change or variance of the NOx reducing effect.

3. An inflator according to claim 2, wherein said prevention means is a partition plate.

4. An inflator according to claim 1, wherein said reducing material is placed in the proximity of a gas outlet from an ignition means accommodation chamber inside a gas generating agent combustion chamber.

5. An air bag system comprising said inflator of claim 1, an impact sensor, control means for inputting a detected signal and outputting an operation signal to said ignition means of a gas generator, and an air bag.

6. A method of reducing NOx generated by the combustion of a gas generating agent inside an inflator for an air bag, by reducing NOx by a reducing material and decreasing its amount, wherein said inflator comprises an ignition means, a gas generating agent and a coolant/filter, and said reducing material is placed inside said inflator, and said reducing material is a guanidine derivative.