WO2004058642A1 - Elimination de nox pour moteurs a combustion interne - Google Patents

Elimination de nox pour moteurs a combustion interne Download PDF

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Publication number
WO2004058642A1
WO2004058642A1 PCT/US2003/040263 US0340263W WO2004058642A1 WO 2004058642 A1 WO2004058642 A1 WO 2004058642A1 US 0340263 W US0340263 W US 0340263W WO 2004058642 A1 WO2004058642 A1 WO 2004058642A1
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WO
WIPO (PCT)
Prior art keywords
catalyst
reagent
exhaust gas
zone
process according
Prior art date
Application number
PCT/US2003/040263
Other languages
English (en)
Inventor
James Valentine
Jeremy Peter-Hoblyn
John Hofmann
Original Assignee
Clean Diesel Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clean Diesel Technologies, Inc. filed Critical Clean Diesel Technologies, Inc.
Priority to AU2003299676A priority Critical patent/AU2003299676A1/en
Priority to EP03799961A priority patent/EP1583714A4/fr
Publication of WO2004058642A1 publication Critical patent/WO2004058642A1/fr
Priority to US10/536,170 priority patent/US20090004083A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention concerns a new device and process for reducing NO x emissions, particularly for mobile diesel and other lean-burn engines.
  • Diesel and lean-burn gasoline engines provide particular advantages in fuel economy and are favored for this reason.
  • NO x nitrogen oxides
  • Emissions of NO x can also be reduced by post-combustion techniques.
  • a particularly good example of such techniques is selective catalytic reduction (SCR).
  • SCR selective catalytic reduction
  • NO x is reacted with NH 3 , or similar nitrogen containing compounds such as urea and like materials, over a catalyst to yield nitrogen gas (N 2 ) and water (H 2 O).
  • N 2 nitrogen gas
  • H 2 O water
  • catalysts that have been described in the literature but each catalyst tends to have a relative narrow temperature range over the catalyst is effective. Such behavior has been described in detail by R.M. Heck, I.M. Chen and B.K. Speronello of the Engelhard Corporation. In "Operating Characteristics and Commercial Operating Experience with High Temperature SCR NO x Catalyst", Environmental Progress, Vol. 13, No.4, pp. 221-225.
  • the exhaust gas from a typical diesel engine can have a gas temperature that ranges from about 150°C all the way up to 600°C and perhaps even higher. This range arises from variations in the engine load with increasing load resulting in higher gas temperatures. No single catalyst has been found to be effective over this entire temperature range. Thus, NO x reduction has been limited for engines that operate under transient conditions wherein exhaust gas temperature can very over the entire range.
  • the invention provides a new device and a new process addressing the above needs.
  • a multi-stage NO x reduction system employs catalysts effective at different temperature ranges and has reagent injectors associated with each or a means for directing reagent to each.
  • a controller moves reagent introduction from one catalyst to the other as temperature and other conditions dictate. Valving could redirect exhaust to particular catalyst zones, if necessary.
  • Figure 1 is a schematic view of one embodiment of the invention
  • Figure 2 is a schematic view of another embodiment of the invention. Description Of The Invention
  • the invention relates to a new device and a new process addressing the above needs and is intended for use with diesel engines, but has applicability to any combustors having similar wide variations in exhaust gas temperatures, such as turbines, boilers, furnaces, process heaters, heat recovery units, and the like, utilizing carbonaceous, e.g., fossil or bio-derived, fuels such as distillates, residual and gaseous fuels.
  • combustors having similar wide variations in exhaust gas temperatures, such as turbines, boilers, furnaces, process heaters, heat recovery units, and the like, utilizing carbonaceous, e.g., fossil or bio-derived, fuels such as distillates, residual and gaseous fuels.
  • NO x - reducing reagent can, for example, be selected from the group consisting of ammelide, ammeline, ammonia, ammonium carbonate, ammonium bicarbonate, ammonium carbamate, ammonium cyanate, ammonium salts of inorganic acids, ammonium salts of organic acids, biuret, cyanuric acid, hexamethylenetetramine, isocyanic acid, lower alkyl amines, melamine, tricyanourea and urea.
  • a diesel engine is fitted with two catalysts in series in the exhaust gas. Means for introducing the reagent for NO x reduction are provided at points upstream of each catalyst zone.
  • the first catalyst (Low-Temp Catalyst Zone 1) could be of the LT -1 or LT -2 types as described in the above-cited paper by Heck, et al.
  • the second catalyst (High-Temp Catalyst Zone 2) could be of the VNX or ZNX type as described by Heck, et al.
  • the NO x reducing agent would be injected upstream of catalyst zone 1.
  • Reduction in NO x emissions would be achieved over catalyst zone 1 and there would be little if any further reaction over catalyst 2.
  • NO x reducing reagent e.g., NH 3 or the like
  • An automatic control including a temperature sensor to detect the gas temperature, switches the location of reagent injection from catalyst zone 1 to catalyst zone 2. Following the switch, reduction of NO x is achieved over catalyst 2 that is effective for NOx reduction at a higher temperature, say in the range of 300-450°C.
  • the reagent will be introduced into both the first and second zones.
  • the utilization of reagent can be controlled to a highly efficient extent. Because reagent can be almost as expensive as fuel, this is a particularly advantageous embodiment, and the controller will take measured parameters and compare them to reference values to create control signals that can optimize reagent and fuel utilization while maximizing NO x reduction. If desired, feed back control can help assure maintenance of target values.
  • control unit 679,603 is particularly well suited to be employed in the multiple catalyst system because of their small in size, an ability to operate without any secondary medium for atomization, such as air and it can be close-coupled to the catalyst zone.
  • the control unit can also receive other control inputs as described in the above patents, which are incorporated herein by reference, and can control the fuel and air supply to the engine, and can control exhaust gas recirculation, EGR, as useful for NO x control and fuel economy as described in U. S. Patent No. 5,924,280.
  • Figure 2 describes another embodiment, wherein a diesel engine exhaust is passed through a valve which directs exhaust gas flow to either low temperature catalyst No.1 of the precious metal or base metal (vanadium/titanium type) during low exhaust gas temperatures (350°F-800°F) such as described in SAE 2001-01-0519; or to high temperature catalyst No.2, typically of the zeolite type, for temperatures of 675 °F to 1100°F, based on an input from a temperature sensor in the exhaust stream upstream of the exhaust gas valve.
  • low temperature catalyst No.1 of the precious metal or base metal vanadium/titanium type
  • high temperature catalyst No.2 typically of the zeolite type
  • Valves such as those used with exhaust gas recirculation are known to be able to operate in this environment. Temperature signals are fed to an engine control unit (ECU) or other suitable controller, which controls the valve to regulate the flow of exhaust gas between catalyst 1 or catalyst 2 based on exhaust gas temp or an engine signal, such as load, speed or rpm, as a predictor of exhaust gas temperature.
  • ECU engine control unit
  • Urea or other NO x reducing reagent is injected upstream of the valve for single injector systems or downstream of the valve but upstream of each separate catalyst zone for dual injector systems.
  • valve In single or dual injector systems the valve can regulate exhaust gas flow, and reagent injection rate is controlled to maximize NO x reduction across either catalyst No, or catalyst No.2 or both in combination by regulating exhaust gas flow and injector feed rate of reagent.
  • All of the references cited above are hereby incorporated by reference in their entireties to show and describe the points illustrated herein, and should be taken as if fully and bodily incorporated. It is not intended to detail all of the possible modifications and variations which will become apparent to the skilled worker upon reading the description. It is intended, however, that all such modifications and variations be included within the scope of the invention which is seen in the above description and otherwise defined by the following claims. The claims are meant to cover the indicated elements and steps in any arrangement or sequence which is effective to meet the objectives intended for the invention, unless the context specifically indicates the contrary.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention porte sur un système de réduction en plusieurs étapes des émissions de Nox, ce système utilisant des catalyseurs efficaces, à différentes plages de température, des injecteurs de réactif pouvant être associés à chacun de ces catalyseurs, et le système pouvant être utilisé en série ou en parallèle. Un contrôleur dirige l'introduction du réactif dans un catalyseur quelconque, en fonction de la température et autres conditions. Des soupapes peuvent rediriger l'échappement vers des zones données des catalyseurs, si nécessaire.
PCT/US2003/040263 2002-12-17 2003-12-17 Elimination de nox pour moteurs a combustion interne WO2004058642A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2003299676A AU2003299676A1 (en) 2002-12-17 2003-12-17 NOx CONTROL FOR IC ENGINES
EP03799961A EP1583714A4 (fr) 2002-12-17 2003-12-17 Elimination de no sb x /sb pour moteurs a combustion interne
US10/536,170 US20090004083A1 (en) 2003-12-17 2005-06-17 NOx control for IC engines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43433502P 2002-12-17 2002-12-17
US60/434,335 2002-12-17

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/536,170 Continuation US20090004083A1 (en) 2003-12-17 2005-06-17 NOx control for IC engines

Publications (1)

Publication Number Publication Date
WO2004058642A1 true WO2004058642A1 (fr) 2004-07-15

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Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2003/040071 WO2004058641A1 (fr) 2002-12-17 2003-12-16 Reduction des emissions de nox dans des moteurs a combustion interne
PCT/US2003/040263 WO2004058642A1 (fr) 2002-12-17 2003-12-17 Elimination de nox pour moteurs a combustion interne

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Application Number Title Priority Date Filing Date
PCT/US2003/040071 WO2004058641A1 (fr) 2002-12-17 2003-12-16 Reduction des emissions de nox dans des moteurs a combustion interne

Country Status (3)

Country Link
EP (1) EP1583714A4 (fr)
AU (2) AU2003299644A1 (fr)
WO (2) WO2004058641A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008045499A2 (fr) 2006-10-11 2008-04-17 Tenneco Automotive Operating Company Inc. Système à injecteur double pour la régulation des émissions de moteurs diesel
DE112006003231T5 (de) 2005-11-30 2008-10-02 Caterpillar Inc., Peoria Mehrstufiges System zur selektiven katalytischen Reduktion
US7805929B2 (en) 2005-12-21 2010-10-05 Caterpillar Inc Selective catalytic reduction system
WO2014016616A1 (fr) * 2012-07-27 2014-01-30 Perkins Engines Company Limited Procédé et appareil de commande d'un système de post-traitement de gaz d'échappement
US9192892B2 (en) 2014-01-16 2015-11-24 Cummins Emission Solutions, Inc. Selective dosing module control system
EP3141718A1 (fr) 2015-09-09 2017-03-15 Cummins Emission Solutions, Inc. Insertion de réducteur asynchrone dans des systèmes de post-traitement

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9511350B2 (en) 2013-05-10 2016-12-06 Clean Diesel Technologies, Inc. (Cdti) ZPGM Diesel Oxidation Catalysts and methods of making and using same
US9511355B2 (en) 2013-11-26 2016-12-06 Clean Diesel Technologies, Inc. (Cdti) System and methods for using synergized PGM as a three-way catalyst
US20140274662A1 (en) 2013-03-15 2014-09-18 Cdti Systems and Methods for Variations of ZPGM Oxidation Catalysts Compositions
US9771534B2 (en) 2013-06-06 2017-09-26 Clean Diesel Technologies, Inc. (Cdti) Diesel exhaust treatment systems and methods
US9545626B2 (en) 2013-07-12 2017-01-17 Clean Diesel Technologies, Inc. Optimization of Zero-PGM washcoat and overcoat loadings on metallic substrate
US9511358B2 (en) 2013-11-26 2016-12-06 Clean Diesel Technologies, Inc. Spinel compositions and applications thereof
US9579604B2 (en) 2014-06-06 2017-02-28 Clean Diesel Technologies, Inc. Base metal activated rhodium coatings for catalysts in three-way catalyst (TWC) applications
US9731279B2 (en) 2014-10-30 2017-08-15 Clean Diesel Technologies, Inc. Thermal stability of copper-manganese spinel as Zero PGM catalyst for TWC application
US9700841B2 (en) 2015-03-13 2017-07-11 Byd Company Limited Synergized PGM close-coupled catalysts for TWC applications
US9951706B2 (en) 2015-04-21 2018-04-24 Clean Diesel Technologies, Inc. Calibration strategies to improve spinel mixed metal oxides catalytic converters
US10533472B2 (en) 2016-05-12 2020-01-14 Cdti Advanced Materials, Inc. Application of synergized-PGM with ultra-low PGM loadings as close-coupled three-way catalysts for internal combustion engines
US9861964B1 (en) 2016-12-13 2018-01-09 Clean Diesel Technologies, Inc. Enhanced catalytic activity at the stoichiometric condition of zero-PGM catalysts for TWC applications
US10265684B2 (en) 2017-05-04 2019-04-23 Cdti Advanced Materials, Inc. Highly active and thermally stable coated gasoline particulate filters

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5296206A (en) * 1992-07-31 1994-03-22 Foster Wheeler Energy Corporation Using flue gas energy to vaporize aqueous reducing agent for reduction of NOx in flue gas
US5785937A (en) * 1994-08-10 1998-07-28 Siemens Aktiengesellschaft Method for the catalytic conversion of nitrogen oxides present in the exhaust gas of an internal-combustion engine
US5968464A (en) * 1997-05-12 1999-10-19 Clean Diesel Technologies, Inc. Urea pyrolysis chamber and process for reducing lean-burn engine NOx emissions by selective catalytic reduction
US6401455B1 (en) * 1997-07-24 2002-06-11 Siemens Aktiengesellschaft Exhaust emission control system for the exhaust gas of a diesel engine
US6475453B1 (en) * 1996-02-12 2002-11-05 Siemens Aktiengesellschaft Configuration for decomposing nitrogen oxides in a gas stream and method for using the configuration

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783160A (en) * 1995-01-27 1998-07-21 Toyota Jidosha Kabushiki Kaisha Method for purifying combustion exhaust gas
JP3473583B2 (ja) * 2000-07-24 2003-12-08 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP3876705B2 (ja) * 2001-12-13 2007-02-07 いすゞ自動車株式会社 ディーゼルエンジンの排気ガス浄化システム
DE10237777A1 (de) * 2002-08-17 2004-02-26 Daimlerchrysler Ag Brennkraftmaschine mit Reduktionsmittelerzeugungseinheit und Betriebsverfahren hierfür

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5296206A (en) * 1992-07-31 1994-03-22 Foster Wheeler Energy Corporation Using flue gas energy to vaporize aqueous reducing agent for reduction of NOx in flue gas
US5785937A (en) * 1994-08-10 1998-07-28 Siemens Aktiengesellschaft Method for the catalytic conversion of nitrogen oxides present in the exhaust gas of an internal-combustion engine
US6475453B1 (en) * 1996-02-12 2002-11-05 Siemens Aktiengesellschaft Configuration for decomposing nitrogen oxides in a gas stream and method for using the configuration
US5968464A (en) * 1997-05-12 1999-10-19 Clean Diesel Technologies, Inc. Urea pyrolysis chamber and process for reducing lean-burn engine NOx emissions by selective catalytic reduction
US6401455B1 (en) * 1997-07-24 2002-06-11 Siemens Aktiengesellschaft Exhaust emission control system for the exhaust gas of a diesel engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1583714A4 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006003231T5 (de) 2005-11-30 2008-10-02 Caterpillar Inc., Peoria Mehrstufiges System zur selektiven katalytischen Reduktion
US7485272B2 (en) 2005-11-30 2009-02-03 Caterpillar Inc. Multi-stage system for selective catalytic reduction
US7805929B2 (en) 2005-12-21 2010-10-05 Caterpillar Inc Selective catalytic reduction system
WO2008045499A2 (fr) 2006-10-11 2008-04-17 Tenneco Automotive Operating Company Inc. Système à injecteur double pour la régulation des émissions de moteurs diesel
US8109077B2 (en) 2006-10-11 2012-02-07 Tenneco Automotive Operating Company Inc. Dual injector system for diesel emissions control
CN104718356A (zh) * 2012-07-27 2015-06-17 珀金斯发动机有限公司 用于控制排气后处理系统的方法和装置
WO2014016616A1 (fr) * 2012-07-27 2014-01-30 Perkins Engines Company Limited Procédé et appareil de commande d'un système de post-traitement de gaz d'échappement
US9192892B2 (en) 2014-01-16 2015-11-24 Cummins Emission Solutions, Inc. Selective dosing module control system
US9551251B2 (en) 2014-01-16 2017-01-24 Cummins Emission Solutions, Inc. Selective dosing module control system
US9677445B2 (en) 2014-01-16 2017-06-13 Cummins Emission Solutions, Inc. Selective dosing module control system
EP3141718A1 (fr) 2015-09-09 2017-03-15 Cummins Emission Solutions, Inc. Insertion de réducteur asynchrone dans des systèmes de post-traitement
EP3470642A1 (fr) * 2015-09-09 2019-04-17 Cummins Emission Solutions, Inc. Insertion de réducteur asynchrone dans des systèmes de post-traitement
US10364731B2 (en) 2015-09-09 2019-07-30 Cummins Emission Solutions Inc. Asynchronous reductant insertion in aftertreatment systems
US10557397B2 (en) 2015-09-09 2020-02-11 Cummins Emission Solutions Inc. Asynchronous reductant insertion in aftertreatment systems

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EP1583714A1 (fr) 2005-10-12
WO2004058641A1 (fr) 2004-07-15
AU2003299644A1 (en) 2004-07-22
AU2003299676A1 (en) 2004-07-22
EP1583714A4 (fr) 2007-04-11

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