US6387336B2
Expired / Lapsed
US
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Method and device for selective catalytic NOx reduction
Assignee: Robert Bosch GmbH
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Filing: 1998-06-25
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Granted: 2002-05-14
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Expires: 2018-06-25
Abstract
Abstract In a method and device for selective catalytic NOx reduction in oxygen-containing exhaust gases using ammonia and a reduction catalyst, gaseous ammonia is made available by heating a solid storage medium in a container. The method and device are suitable for use in motor vehicles in particular.
Inventors
- 👤 Armin Marko
- 👤 Thomas Wahl
- 👤 Ulrich Alkemade
- 👤 Frank Brenner
- 👤 Marc Bareis
- 👤 Horst Harndorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:20
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/003; C01C1/006; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/206; F01N3/2066; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; F01N2610/00; F01N2610/02; F01N2610/06; F01N2610/10; F01N2610/14; F01N2610/1406; F01N2610/1446; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02P; Y02P20/00; Y02P20/10; Y02P20/129; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
92 words
A method for providing a selective catalytic NO x reduction in an oxygen-containing exhaust gas of an engine by using a gaseous ammonia and a reduction catalyzer, the method comprising the steps of: introducing a solid storage medium into a container, the solid storage medium storing ammonia; heating the solid storage medium to provide the gaseous ammonia; charging a quantity of the gaseous ammonia into the exhaust gas to provide a charged ammonia quantity; and adapting the charged ammonia quantity to an actual operating condition of the engine via a control device.
Claim 2
Independent Claim
92 words
A method for providing a selective catalytic NO x reduction in an oxygen-containing exhaust gas of an engine by using a gaseous ammonia and a reduction catalyzer, the method comprising the steps of: introducing a solid storage medium into a container, the solid storage medium storing ammonia; heating the solid storage medium to provide the gaseous ammonia; charging a quantity of the gaseous ammonia into the exhaust gas to provide a charged ammonia quantity; and adapting the charged ammonia quantity to an actual operating condition of the engine via a control device.
Claim 3
Dependent Claim
16 words
The method according to claim 1 , wherein the solid storage medium binds ammonia by adsorption.
Claim 4
Dependent Claim
21 words
The method according to claim 1 , wherein the solid storage medium binds ammonia in a form of a chemical complex.
Claim 5
Dependent Claim
17 words
The method according to claim 1 , wherein the solid storage medium includes at least one salt.
Claim 6
Dependent Claim
30 words
The method according to claim 4 , wherein the at least one salt includes at least one of a chloride and a sulfate of at least one alkaline earth metal.
Claim 7
Dependent Claim
35 words
The method according to claim 4 , wherein the at least one salt includes at least one of a chloride and a sulfate of at least one of manganese, iron, cobalt, nickel, copper and zinc.
Claim 8
Dependent Claim
25 words
The method according to claim 4 , wherein the at least one salt includes at least one of manganese, iron, cobalt, nickel, copper and zinc.
Claim 9
Dependent Claim
22 words
The method according to claim 1 , wherein the solid storage medium includes at least one of strontium chloride and calcium chloride.
Claim 10
Dependent Claim
42 words
The method according to claim 1 , wherein the solid storage medium is heated in the heating step by at least one of an electric heating system, a waste heat of an engine coolant and a waste heat of an exhaust gas.
Claim 11
Dependent Claim
27 words
The method according to claim 1 , wherein the solid storage medium is heated in the heating step to a temperature within 50° C. to 200° C.
Claim 12
Dependent Claim
27 words
The method according to claim 10 , wherein the solid storage medium is heated in the heating step to a temperature within 80° C. to 150° C.
Claim 13
Dependent Claim
29 words
The method according to claim 1 , wherein the solid storage medium is heated in the heating step to an ammonia vapor pressure within 0.1 bar to 30 bar.
Claim 14
Dependent Claim
29 words
The method according to claim 12 , wherein the solid storage medium is heated in the heating step to an ammonia vapor pressure within 2 bar to 10 bar.
Claim 15
Dependent Claim
30 words
The method according to claim 1 , wherein the solid storage medium includes at least one of a halogen, an alkaline earth metal, manganese, iron, cobalt, nickel, copper and zinc.
Claim 16
Dependent Claim
25 words
The method according to claim 14 , wherein the halogen includes chlorine and the alkaline earth metal includes at least one of strontium and calcium.
Claim 17
Independent Claim
110 words
A device for providing a selective catalytic NO x reduction in an oxygen-containing exhaust gas of an engine by using a gaseous ammonia and a reduction catalyzer, the device comprising: a supply line adapted to supply the gaseous ammonia into an exhaust line between the engine and the reduction catalyzer; a container for containing a solid storage medium, the solid storage medium storing ammonia; a valve arrangement for coupling the supply line to the container; a heating device for heating the container; and a control device for adapting a quantity of gaseous ammonia conveyed to the exhaust line via a charging arrangement to an actual operating condition of the engine.
Claim 18
Independent Claim
110 words
A device for providing a selective catalytic NO x reduction in an oxygen-containing exhaust gas of an engine by using a gaseous ammonia and a reduction catalyzer, the device comprising: a supply line adapted to supply the gaseous ammonia into an exhaust line between the engine and the reduction catalyzer; a container for containing a solid storage medium, the solid storage medium storing ammonia; a valve arrangement for coupling the supply line to the container; a heating device for heating the container; and a control device for adapting a quantity of gaseous ammonia conveyed to the exhaust line via a charging arrangement to an actual operating condition of the engine.
Claim 19
Dependent Claim
37 words
The device according to claim 16 , wherein the supply line includes a buffer container for containing the gaseous ammonia and another valve arrangement for metering the gaseous ammonia from the buffer container into the exhaust line.
Claim 20
Dependent Claim
30 words
The device according to claim 16 , wherein the solid storage medium includes at least one of a halogen, an alkaline earth metal, manganese, iron, cobalt, nickel, copper and zinc.
Claim 21
Dependent Claim
25 words
The device according to claim 18 , wherein the halogen includes chlorine and the alkaline earth metal includes at least one of strontium and calcium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-05-13 | 2005-11-12 | 2006-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-05-13 | 2009-11-12 | 2010-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-05-13 | 2013-11-12 | 2014-05-14 | $7700.00 | Window Closed / Lapsed |