Three Way Catalyst
- 최초 등록일
- 2008.12.04
- 최종 저작일
- 2007.06
- 11페이지/ 한컴오피스
- 가격 2,000원
소개글
catalyst
목차
Background1
DefinitionⅢ.
Catalytic ConverterⅣ.
ReactionsⅤ.
KineticsHeat and Mass Transfer PhenomenaⅦ.
Oxygen Storage CapacityⅧ.
Cold Start and Catalyst Fast Light-off
References
본문내용
With increasing interest in global environmental protection, the social demand for cleaner emissions and lower fuel consumption has been growing worldwide. In California, USA, in particular, where emissions must meet the unprecedentedly stringent low emission vehicle(LEV)Ⅱ standard, the industry is required to substantially reduce emissions of hydrocarbons(HC) and nitrogen oxides(NOx). It is therefore necessary to enhance the performance of three-way catalysts. In particular, a high-performance catalyst that can purify exhaust gases even at low temperatures has to be developed.
Conventional measures to cope with the regulations consisted in enhancing the performance of catalysts and improving the engine. Howeber, these approaches are insufficient to meet the recent SULEV and PZEV regulations. Present gasoline engines decrease HC and NOx emissions mainly by using three-way cayalysts. However, 70% of the total HC emission in the driving mode is emitted during the first 100s, suring the "cold start"phase before engine and catalyst are warmed up. It is necessary to be able to adsorb HCs at a temperature below the catalyst`s activation level and then purify them with three-way catalysts as they desorb with increasing temperature.
참고 자료
1. Takaaki Kanazawa, 2004, "Development of hydrocarbon adsorbents, oxygen storage materials for three-way catalyst and NOx storage-reduction catalyst", Toyota Motor Corporation, Japan.
2. L. Martin, 2002, "Simulation three-way catalyst ageing Analysis of two conventional catalyst", University of Salamanca, Spain.
3. http://herkules.oulu.fi/isbn9514269543/html/i1003460.html