US5893267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic reduction system for oxygen-rich exhaust
Assignee: Lawrence Livermore National Security LLC
•
Filing: 1997-08-05
•
Granted: 1999-04-13
•
Expires: 2017-08-05
Abstract
Abstract Non-thermal plasma gas treatment is combined with selective catalytic reduction to enhance NO x reduction in oxygen-rich vehicle engine exhausts.
Inventors
- 👤 George E. Vogtlin
- 👤 Bernard T. Merritt
- 👤 Mark C. Hsiao
- 👤 P. Henrik Wallman
- 👤 Bernardino M. Penetrante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:39
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/206; F01N3/2066; B; B01; B01D; B01D53/00; B01D53/32; B01D53/323; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9431; B01D53/9445; B01D53/9454; F01N13/00; F01N13/009; F01N13/0097; F01N3/02; F01N3/021; F01N3/023; F01N3/0231; F01N3/033; F01N3/035; F01N3/0892; F01N2240/00; F01N2240/28; F01N2570/00; F01N2570/14; F01N2610/00; F01N2610/02; F01N2610/03; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02C; Y02C20/00; Y02C20/10; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A method for reducing nitrous oxides (NO x ) in oxygen-rich exhausts from high-temperature combustion, the method comprising the steps of: converting substantially all NO in an engine oxygen-rich exhaust to an intermediate gas flow including NO 2 ; and converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising NO 2 conversion products of N 2 , CO 2 and H 2 O and substantially little NO and NO 2 (NO x ).
Claim 2
Independent Claim
81 words
A method for reducing nitrous oxides (NO x ) in oxygen-rich exhausts from high-temperature combustion, the method comprising the steps of: converting substantially all NO in an engine oxygen-rich exhaust to an intermediate gas flow including NO 2 ; and converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising NO 2 conversion products of N 2 , CO 2 and H 2 O and substantially little NO and NO 2 (NO x ).
Claim 3
Dependent Claim
32 words
The method of claim 1, wherein: the step of converting substantially all NO in an engine exhaust to an intermediate gas flow including NO 2 includes the use of a plasma converter.
Claim 4
Dependent Claim
31 words
The method of claim 1, wherein: the step of converting substantially all NO in an exhaust to an intermediate gas flow including NO 2 includes the use of an oxidizing catalyst.
Claim 5
Dependent Claim
37 words
The method of claim 1, wherein: the step of converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising little NO x includes the use of selective catalytic reduction (SCR).
Claim 6
Dependent Claim
54 words
The method of claim 1, wherein: the step of converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising little NO x includes the use of a catalyst for directly decomposing NO 2 to N 2 and O 2 in the absence of hydrocarbons and nitrogen-containing reductants.
Claim 7
Independent Claim
80 words
A method for reducing nitrous oxides (NO x ) in exhausts, from high-temperature combustion, the method comprising the steps of: converting substantially all NO in an engine exhaust to an intermediate gas-flow including NO 2 by using a plasma converter; and converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising NO 2 conversion products of N 2 , CO 2 and H 2 O and substantially little NO and NO 2 .
Claim 8
Independent Claim
80 words
A method for reducing nitrous oxides (NO x ) in exhausts, from high-temperature combustion, the method comprising the steps of: converting substantially all NO in an engine exhaust to an intermediate gas-flow including NO 2 by using a plasma converter; and converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising NO 2 conversion products of N 2 , CO 2 and H 2 O and substantially little NO and NO 2 .
Claim 9
Dependent Claim
36 words
The method of claim 6, wherein: the step of converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising little NO includes the use of selective catalytic reduction (SCR).
Claim 10
Dependent Claim
54 words
The method of claim 6, wherein: the step of converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising little NO x includes the use of a catalyst for directly decomposing NO 2 to N 2 and O 2 in the absence of hydrocarbons and nitrogen-containing reductants.
Claim 11
Independent Claim
84 words
A method for reducing nitrous oxides (NO x ) in exhausts, from high-temperature combustion, the method comprising the steps of: converting substantially all NO in an engine exhaust to an intermediate gas flow including NO 2 ; and converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising NO 2 conversion products of N 2 , CO 2 and H 2 O and substantially little NO and NO 2 in the absence of hydrocarbons and nitrogen-containing reductants.
Claim 12
Independent Claim
84 words
A method for reducing nitrous oxides (NO x ) in exhausts, from high-temperature combustion, the method comprising the steps of: converting substantially all NO in an engine exhaust to an intermediate gas flow including NO 2 ; and converting substantially all of said intermediate gas flow including NO 2 to an output gas flow comprising NO 2 conversion products of N 2 , CO 2 and H 2 O and substantially little NO and NO 2 in the absence of hydrocarbons and nitrogen-containing reductants.
Claim 13
Dependent Claim
32 words
The method of claim 9, wherein: the step of converting substantially all NO in an engine exhaust to an intermediate gas flow including NO 2 includes the use of a plasma converter.
Claim 14
Dependent Claim
32 words
The method of claim 9, wherein: the step of converting substantially all NO in an engine exhaust to an intermediate gas flow including NO 2 includes the use of an oxidizing catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-04-12 | 2002-10-12 | 2003-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-12 | 2006-10-12 | 2007-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-12 | 2010-10-12 | 2011-04-13 | $7700.00 | Window Closed / Lapsed |