IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0464109
(1995-06-05)
|
발명자
/ 주소 |
- Swaroop Srinivas H. (Painted Post NY) Wusirika Raja R. (Painted Post NY)
|
출원인 / 주소 |
- Corning Incorporated (Corning NY 02)
|
인용정보 |
피인용 횟수 :
17 인용 특허 :
5 |
초록
▼
A system and method are disclosed for converting exhaust gas which comprises NOx, CO, and hydrocarbons, to innocuous products. Exhaust gas is contacted in undiverted flow with a zeolite suitable for adsorption of hydrocarbons, and with a main catalyst suitable for conversion of NOx, CO, and hydrocar
A system and method are disclosed for converting exhaust gas which comprises NOx, CO, and hydrocarbons, to innocuous products. Exhaust gas is contacted in undiverted flow with a zeolite suitable for adsorption of hydrocarbons, and with a main catalyst suitable for conversion of NOx, CO, and hydrocarbons to innocuous products. Adsorption occurs when the temperature of the zeolite is suitable therefor. Conversion occurs when the temperature of the main catalyst is suitable therefor. The zeolite and main catalyst are connected directly to one another, that is, in-line, without by-pass valving. The zeolite can be Y zeolite, Beta, ZSM-5, and combinations thereof, and has a SiO2 to Al2O3, mole ratio of no greater than about 200, and is ion exchanged with a metal which can be rare earth, chromium, and combinations thereof.
대표청구항
▼
A method for removing at least one of the pollutants NOx, CO, and hydrocarbons from an exhaust gas, said method comprising contacting said exhaust gas in undiverted flow first with a zeolite suitable for adsorption of hydrocarbons, and thereafter with a main catalyst suitable for conversion of NOx,
A method for removing at least one of the pollutants NOx, CO, and hydrocarbons from an exhaust gas, said method comprising contacting said exhaust gas in undiverted flow first with a zeolite suitable for adsorption of hydrocarbons, and thereafter with a main catalyst suitable for conversion of NOx, CO, and hydrocarbons to innocuous products, at a temperature ranging from cold-start temperatures to light-off temperatures, wherein when the temperature is in the cold-start range and the exhaust gas contains hydrocarbons, the zeolite adsorbs the hydrocarbons, and when the temperature is in the light-off range, and the exhaust gas contains NOx, CO, and hydrocarbons, the main catalyst converts the NOx, CO, and the hydrocarbons to innocuous products, said zeolite being selected from the group consisting of Y zeolite, Beta, ZSM-5, mordenite, and combinations thereof, and having a SiO2 Al2O3 mole ratio of no greater than about 200, said zeolite being ion exchanged with chromium.
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