IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0213213
(2005-08-26)
|
등록번호 |
US-7316106
(2008-01-08)
|
우선권정보 |
KR-10-2004-0071277(2004-09-07); KR-10-2005-0038199(2005-05-07) |
발명자
/ 주소 |
|
출원인 / 주소 |
- GM Daewoo Auto & Technology Company
|
대리인 / 주소 |
Schweitzer Cornman Gross & Bondell LLP
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
7 |
초록
▼
The invention relates to a system and a method for processing exhaust gas of an internal combustion engine such as a diesel engine. The disclosed system and method can be particularly suitable to the diesel engine that usually operates in a lean burn condition without the occurrence of a periodic hi
The invention relates to a system and a method for processing exhaust gas of an internal combustion engine such as a diesel engine. The disclosed system and method can be particularly suitable to the diesel engine that usually operates in a lean burn condition without the occurrence of a periodic high-load condition in view of its combustion characteristics. According to the system and method, an exhaust composition containing soot particles and gaseous components are processed to remove the soot particles and to reduce the amount of NOx compounds. The soot particles are first filtered with a filter that passes gaseous components of the composition and collecting the soot particles. The collected soot particles are oxidized in the presence of a light-activated redox catalyst to turn to smaller molecules that can pass through the filter. The NOx compounds are temporarily adsorbed by an adsorber and reduced in the presence of a light-activated redox catalyst to turn to N2.
대표청구항
▼
What is claimed is: 1. A method of processing a composition comprising soot particles and NOx, the method comprising: flowing a composition comprising soot particles and gaseous components through a conduit in a flow direction, the gaseous components comprising NOx compounds, which comprise NO and
What is claimed is: 1. A method of processing a composition comprising soot particles and NOx, the method comprising: flowing a composition comprising soot particles and gaseous components through a conduit in a flow direction, the gaseous components comprising NOx compounds, which comprise NO and NO2; filtering the soot particles with a filter located in the conduit while passing most of the gaseous components through the filter, the soot particles comprising hydrocarbons that may not pass through the filter; removing at least part of the filtered soot particles from the filter by an oxidation reaction of some or all of the hydrocarbons, which are broken into smaller molecules that can pass through the filter; adsorbing at least part of the NOx compounds with an adsorber located in the conduit past the filter in the flow direction; and converting at least part of the adsorbed NOx compounds to N2 by a reduction reaction of NOx compounds in the presence of a photocatalyst, wherein the photocatalyst is activated by light created during a plasma discharge. 2. The method of claim 1, wherein at least part of the smaller molecules passing through the filter participates in the reduction reaction of NOx compounds as a reducing agent. 3. The method of claim 1, wherein the oxidation reaction is conducted in the presence of a redox catalyst. 4. The method of claim 1, wherein the photocatalyst is selected from the group consisting of TiO2, ZnO, CdS, ZrO2, SnO2, V2O2, WO3, SrTiO3, and a mixture comprising one or more of the foregoing compounds. 5. The method of claim 1, wherein the photocatalyst is provided in the vicinity of the adsorber. 6. The method of claim 3, wherein the redox catalyst comprises a photocatalyst that can be activated by applying light thereto, and wherein the method further comprises applying light to the photocatalyst so as to activate the redox catalyst. 7. The method of claim 6, wherein applying light comprises providing creating a controllable plasma discharge in the vicinity of the photocatalyst. 8. The method of claim 1, wherein a degree of activation of the photocatalyst is controllable by intensity of the light applied thereto, and wherein the method further comprises controlling the intensity of the light, thereby controlling the degree of activation of the photocatalyst. 9. The method of claim 6, wherein the method further comprises increasing the intensity of the light applied to the photocatalyst for the oxidation reaction of hydrocarbons so as to supply more reducing agents for the reduction reaction of NOx compounds. 10. The method of claim 1, further comprising subjecting the composition to oxidation conditions in an area in the conduit before the filter in the flow direction, wherein at least part of components of the composition is oxidized in the oxidation conditions before reaching the filter. 11. The method of claim 10, wherein the oxidation conditions are provided by activating a photocatalytic redox catalyst provided in the area by applying light thereto, and wherein the method further comprises changing the intensity of the light, thereby controlling a degree of activation of the redox catalyst and controlling the oxidation of components of the composition while passing through the area. 12. The method of claim 11, wherein at least part of the oxidized components in the oxidation conditions participates in the oxidation reaction of hydrocarbons as an oxidizing agent, and wherein the method further comprises increasing the intensity of the light applied to the photocatalyst so as to supply more oxidizing agents for the oxidation reaction of hydrocarbons. 13. The method of claim 1, wherein the composition comprises an exhaust gas from combustion of fuel comprising hydrocarbons and wherein the oxidation and reduction reactions require no additional oxidizing agent or reducing agent other than the exhaust gas and air from the surrounding. 14. A method for purifying exhaust gas of an engine, the method comprising: oxidizing at least part of hydrocarbons, CO, NO and particulate matters contained in the exhaust gas by an oxidation reaction in the presence of a light-activated redox catalyst in a first reactor, wherein the light-activated redox catalyst is activated by light generated by a plasma discharge within the first reactor; collecting with a filter the particulate matters of the exhaust gas after the first reactor, and oxidizing at least part of the collected particulate matters by an oxidation reaction in the presence of a light-activated redox catalyst in a second reactor, wherein the light-activated redox catalyst is activated by light generated by a plasma discharge within the second reactor; adsorbing with an adsorber NOx contained in the exhaust gas after the second reactor and removing at least part of the adsorbed NOx by a reduction reaction in the presence of a light-activated redox catalyst in a third reactor, wherein the light-activated redox catalyst is activated by light generated by a plasma discharge within the third reactor; and controlling the activity of the light-activated redox catalysts in the first, second and third reactors by adjusting intensity of light generated by the plasma discharges in the first, second and third reactors. 15. The method of claim 14, wherein the method is used in connection with a diesel engine, wherein the method further comprises making a determination whether the diesel engine is operated either in a lean or rich burn condition, and wherein the activity of the light-activated redox catalysts is controlled based on such determination of the diesel engine's operation. 16. The method of claim 8, wherein the method is used in connection with a diesel engine, wherein the method further comprises making a determination whether the diesel engine is operated either in a lean or rich burn condition, wherein the degree of activation of the photocatalyst is controlled based on such determination.
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