US20190321782A1 - Method for the Cleaning of Exhaust Gas from a Compression Ignition Engine - Google Patents
Method for the Cleaning of Exhaust Gas from a Compression Ignition Engine Download PDFInfo
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- US20190321782A1 US20190321782A1 US16/453,385 US201916453385A US2019321782A1 US 20190321782 A1 US20190321782 A1 US 20190321782A1 US 201916453385 A US201916453385 A US 201916453385A US 2019321782 A1 US2019321782 A1 US 2019321782A1
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- catalyst
- exhaust gas
- ammonia
- reducing agent
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- 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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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- 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
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- 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
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- 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
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9463—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick
- B01D53/9472—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick in different zones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- 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
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- 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
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- 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]
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- 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
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- 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
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- 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
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Definitions
- the present invention relates to a method and system for reducing emission of nitrogen oxides (NOx) and particular matter being present in the exhaust from a lean burning internal compression ignition engine.
- NOx nitrogen oxides
- the method and system of the invention provides an improved reduction of NOx during cold start of the engine.
- the conventional exhaust system of modern cars and trucks with lean burning engines is equipped with a sequence of an oxidation catalyst, a particulate filter and a catalyst for the selective reduction of NOx (SCR) in presence of a reduction agent.
- SCR selective reduction of NOx
- Oxidation catalysts active in the oxidation of volatile organic compounds and carbon monoxide and SCR catalysts are known in the art and disclosed in numerous publications.
- particulate filters are the so called wall flow filters with a plurality of inlet and outlet channels.
- the inlet channels are closed at their outlet and the outlet channels are closed at their inlet, so that the gas flowing into the filter is forced through porous walls defining the channels, whereby particulate matter is filtered off the gas.
- the SCR catalyst is placed as the third exhaust gas cleaning unit in the systems and it takes some time after the engine has been started before this catalyst reaches its reaction temperature.
- ammonia is commonly employed as the reducing agent.
- Ammonia is a noxious compound and it is preferred to generate ammonia in situ by thermal decomposition of a urea solution being injected as ammonia precursor into the hot exhaust gas upstream the SCR catalyst.
- urea When injected as liquid solution in the exhaust gas, urea decomposes to ammonia in sufficient amounts for the SCR only at a temperature above about 150° C.
- the conventional SCR catalysts are, however, not very active until the temperature reaches 200° C.
- the present invention solves this problem by arranging a SCR catalyst close to the engine and close coupled with a platinum containing oxidation catalyst.
- This SCR catalyst has additionally activity for hydrolyzing urea at lower temperatures and the oxidation catalyst SCR activity.
- Platinum catalysts are active in SCR with ammonia. It is, however, difficult to decompose urea into ammonia in the gas phase at the temperatures where the platinum oxidation catalyst is an active SCR catalyst.
- vanadium oxide catalyst is effective in hydrolyzing urea before it reaches the oxidation catalyst in an exhaust gas cleaning system as described above.
- this invention provides a method for the cleaning of an exhaust gas from a compression ignition engine, comprising the steps of
- an aqueous urea solution into the exhaust gas; in a first mode of operation and at an exhaust gas temperature of between 150 and 220° C. catalytically hydrolysing the aqueous urea solution to an ammonia reducing agent by contact with a first catalyst comprising vanadium oxide supported on titania and subsequently removing part of nitrogen oxides contained in the exhaust gas by contacting the exhaust gas mixed with the ammonia reducing agent with a second catalyst arranged downstream of the first catalyst and comprising platinum on titania and/or alumina; and
- the advantage of the method according to the invention is that the NOx reduction in the first catalyst close to the engine will heat up fast, so that the NOx reduction starts early in the test cycle.
- the NOx reducing and the hydrocarbon reducing catalyst are integrated on one unit.
- a urea injector is arranged upstream of the first catalyst.
- the urea injection point can be used partly only at cold start or continuously during the operation of the engine to increase the overall performance of the total system.
- Pt catalysts have an excellent low temperature SCR performance but the NOx reduction diminishes when the temperature reaches the ignition temperature for ammonia oxidation on the Pt catalyst, which results in ammonia decomposition before the NOx reduction can take place.
- the vanadium oxide containing first catalyst actually begins to be active in the SCR in the same temperature range as oxidation of ammonia takes place on the Pt containing catalyst.
- the first catalyst further comprises tungsten oxide.
- the second catalyst further comprises palladium.
- the advantage of these embodiments is an increased SCR activity by including tungsten oxide in the first catalyst and improved temperature stability, when including palladium in the second catalyst.
- an ammonia oxidation catalyst is layered on at least part of the second catalyst to remove remaining amounts of ammonia, which leave the upstream SCR. Thereby, ammonia slip from the SCR is substantially reduced.
- Preferred ammonia oxidation catalysts comprise platinum and zeolites promoted with iron and/or copper having a high activity in the oxidation of ammonia to innocuous nitrogen and water.
- the first catalyst unit can further comprise a zeolite SCR catalyst in the first catalyst.
- Preferred zeolites are selected from the group of Y-zeolite, beta-zeolite, SAPO-zeolites and chabazites.
- the first and second catalyst is arranged as close couple in a single catalyst unit.
- FIG. 1 A shows schematically a conventional diesel exhaust cleaning system and FIG. B a diesel exhaust cleaning system according to the invention
- FIG. 2 is a graph depicting the efficiency of the vanadium oxide/TiO 2 in the hydration of urea to ammonia at different temperatures.
- FIGS. 3 a and b show the activity of the close couplet vanadium oxide/TiO 2 (SCR) and Pt/TiO 2 (DOC) catalyst according to the invention at two different temperature intervals.
- the combined catalyst SCR/DOC in system B used in the method according to invention replaces the oxidation catalyst DOC in the conventional exhaust gas cleaning system A.
- the SCR/DOC catalyst has dual functions, one as close coupled SCR catalyst with vanadium oxide on TiO 2 and low temperature SCR using the Pt/TiO 2 of the second catalyst at low temperatures and then also using the vanadium oxide/TiO 2 catalyst for hydrolyzing urea to ammonia at low temperatures, which enables the use of urea as precursor of the ammonia reducing agent at lower temperatures down to 150° C.
- FIG. 2 shows the graph of hydration of urea to ammonia and HNCO by contact with a vanadium oxide/TiO 2 catalyst.
- the catalyst was impregnated with a 32.5 vol % urea/water solution.
- the catalyst was heated at a rate of 10 K/min and swept with 70 ml/min with argon and a humidifier.
- the vanadium oxide catalyst has a high activity in the hydration of urea to ammonia at a temperature between 150 and 220° C.
- FIGS. 3 a and 3 b show the activity of the close couplet SCR/DOC catalyst according to the invention at two different temperature intervals.
- a certain amount of urea is hydrolysed over the first vanadium oxide/TiO 2 (SCR) catalyst and ammonia is formed.
- Ammonia reacts then with NOx on the second Pt/TiO 2 (DOC) catalyst, which is SCR active in that temperature range. Both the NOx and ammonia concentration is reduced in the oxidation catalyst due to the SCR reaction.
- SCR vanadium oxide/TiO 2
- the first SCR catalyst becomes more active.
- the reaction zone is moved towards the front of the catalyst and no SCR reaction occurs on the DOC catalyst.
- the formed ammonia concentration is reacted with NOx and both reactants are reduced due to the SCR reaction.
Abstract
A method for the cleaning of exhaust gas from a compression ignition engine, comprising the steps of injecting a first amount of an aqueous urea solution into the gas; in a first mode of operation and at an exhaust gas temperature of between 150 and 220° C. hydrolysing the first amount of urea to ammonia reducing agent in presence of a first catalyst comprising vanadium oxide supported on titania and subsequently removing part of nitrogen oxides contained in the exhaust gas by contacting the gas mixed with the ammonia reducing agent through a second catalyst comprising platinum on titania and/or alumina; and in a second mode of operation and at an exhaust gas temperature above 220° C. removing a part of the nitrogen oxides in presence of the first catalyst and the ammonia reducing agent and subsequently oxidising hydrocarbons, carbon monoxide and remaining amount of the ammonia reducing agent further contained in the exhaust gas by passing the gas through the second catalyst.
Description
- The present invention relates to a method and system for reducing emission of nitrogen oxides (NOx) and particular matter being present in the exhaust from a lean burning internal compression ignition engine. In particular, the method and system of the invention provides an improved reduction of NOx during cold start of the engine.
- Upcoming legislations request very low emissions from trucks and passenger cars. At the same time, the test cycles used start at relatively low temperatures. It is difficult to reduce the NOx in these cold cycles, especially when the so called after treatment systems are becoming more complicated with many different functionalities as hydrocarbon oxidation, soot filtration, NOx reduction and ammonia slip reduction. The most viable system consists of components in the following order, oxidation catalyst, soot filter, NOx reduction catalyst and ammonia slip catalyst.
- The conventional exhaust system of modern cars and trucks with lean burning engines is equipped with a sequence of an oxidation catalyst, a particulate filter and a catalyst for the selective reduction of NOx (SCR) in presence of a reduction agent.
- Oxidation catalysts active in the oxidation of volatile organic compounds and carbon monoxide and SCR catalysts are known in the art and disclosed in numerous publications.
- Typically used particulate filters are the so called wall flow filters with a plurality of inlet and outlet channels. The inlet channels are closed at their outlet and the outlet channels are closed at their inlet, so that the gas flowing into the filter is forced through porous walls defining the channels, whereby particulate matter is filtered off the gas.
- The most difficult emission to handle is nitrogen oxides (NOx). To achieve an acceptable cycle result, the NOx reduction needs to start early in the certification cycle. In the conventional exhaust gas cleaning systems as described above, the SCR catalyst is placed as the third exhaust gas cleaning unit in the systems and it takes some time after the engine has been started before this catalyst reaches its reaction temperature.
- In the SCR treatment, ammonia is commonly employed as the reducing agent. Ammonia is a noxious compound and it is preferred to generate ammonia in situ by thermal decomposition of a urea solution being injected as ammonia precursor into the hot exhaust gas upstream the SCR catalyst.
- Even if urea is innocuous and relatively easy to store on board of a vehicle, use of a liquid solution of urea as a precursor of ammonia reducing agent is problematic in particular in the cold start phase of the engine, i.e. when the exhaust gas temperature is below 200° C.
- When injected as liquid solution in the exhaust gas, urea decomposes to ammonia in sufficient amounts for the SCR only at a temperature above about 150° C. The conventional SCR catalysts are, however, not very active until the temperature reaches 200° C.
- The present invention solves this problem by arranging a SCR catalyst close to the engine and close coupled with a platinum containing oxidation catalyst. This SCR catalyst has additionally activity for hydrolyzing urea at lower temperatures and the oxidation catalyst SCR activity.
- Platinum catalysts are active in SCR with ammonia. It is, however, difficult to decompose urea into ammonia in the gas phase at the temperatures where the platinum oxidation catalyst is an active SCR catalyst.
- We have found that a vanadium oxide catalyst is effective in hydrolyzing urea before it reaches the oxidation catalyst in an exhaust gas cleaning system as described above.
- Pursuant to the above findings and observations, this invention provides a method for the cleaning of an exhaust gas from a compression ignition engine, comprising the steps of
- injecting an aqueous urea solution into the exhaust gas; in a first mode of operation and at an exhaust gas temperature of between 150 and 220° C. catalytically hydrolysing the aqueous urea solution to an ammonia reducing agent by contact with a first catalyst comprising vanadium oxide supported on titania and subsequently removing part of nitrogen oxides contained in the exhaust gas by contacting the exhaust gas mixed with the ammonia reducing agent with a second catalyst arranged downstream of the first catalyst and comprising platinum on titania and/or alumina; and
- in a second mode of operation and at an exhaust gas temperature above 220° C. decomposing the aqueous urea solution to the ammonia reducing agent and removing a part of the nitrogen oxides contained in the exhaust gas by reaction with the ammonia reducing agent in presence of the first catalyst and subsequently oxidising hydrocarbons, carbon monoxide and ammonia further contained in the exhaust gas leaving the first catalyst by contacting the exhaust gas with the second catalyst.
- The advantage of the method according to the invention is that the NOx reduction in the first catalyst close to the engine will heat up fast, so that the NOx reduction starts early in the test cycle. In order to save space it is suggested that the NOx reducing and the hydrocarbon reducing catalyst are integrated on one unit.
- In the method according to the invention, a urea injector is arranged upstream of the first catalyst. The urea injection point can be used partly only at cold start or continuously during the operation of the engine to increase the overall performance of the total system.
- As mentioned hereinbefore, Pt catalysts have an excellent low temperature SCR performance but the NOx reduction diminishes when the temperature reaches the ignition temperature for ammonia oxidation on the Pt catalyst, which results in ammonia decomposition before the NOx reduction can take place.
- The vanadium oxide containing first catalyst actually begins to be active in the SCR in the same temperature range as oxidation of ammonia takes place on the Pt containing catalyst.
- In an embodiment of the invention, the first catalyst further comprises tungsten oxide.
- In still an embodiment of the invention, the second catalyst further comprises palladium.
- The advantage of these embodiments is an increased SCR activity by including tungsten oxide in the first catalyst and improved temperature stability, when including palladium in the second catalyst.
- In further an embodiment of the invention, an ammonia oxidation catalyst is layered on at least part of the second catalyst to remove remaining amounts of ammonia, which leave the upstream SCR. Thereby, ammonia slip from the SCR is substantially reduced. Preferred ammonia oxidation catalysts comprise platinum and zeolites promoted with iron and/or copper having a high activity in the oxidation of ammonia to innocuous nitrogen and water.
- In still an embodiment, the first catalyst unit can further comprise a zeolite SCR catalyst in the first catalyst. Preferred zeolites are selected from the group of Y-zeolite, beta-zeolite, SAPO-zeolites and chabazites.
- It is preferred in all the above embodiments that the first and second catalyst is arranged as close couple in a single catalyst unit.
- The invention is described in more detail by reference to the drawings, in which
-
FIG. 1 A shows schematically a conventional diesel exhaust cleaning system and FIG. B a diesel exhaust cleaning system according to the invention; -
FIG. 2 is a graph depicting the efficiency of the vanadium oxide/TiO2 in the hydration of urea to ammonia at different temperatures; and -
FIGS. 3 a and b show the activity of the close couplet vanadium oxide/TiO2 (SCR) and Pt/TiO2 (DOC) catalyst according to the invention at two different temperature intervals. - As shown in
FIG. 1 , the combined catalyst SCR/DOC in system B used in the method according to invention replaces the oxidation catalyst DOC in the conventional exhaust gas cleaning system A. The SCR/DOC catalyst has dual functions, one as close coupled SCR catalyst with vanadium oxide on TiO2 and low temperature SCR using the Pt/TiO2 of the second catalyst at low temperatures and then also using the vanadium oxide/TiO2 catalyst for hydrolyzing urea to ammonia at low temperatures, which enables the use of urea as precursor of the ammonia reducing agent at lower temperatures down to 150° C. -
FIG. 2 shows the graph of hydration of urea to ammonia and HNCO by contact with a vanadium oxide/TiO2 catalyst. The catalyst was impregnated with a 32.5 vol % urea/water solution. - The catalyst was heated at a rate of 10 K/min and swept with 70 ml/min with argon and a humidifier.
- As apparent from the
FIG. 2 , the vanadium oxide catalyst has a high activity in the hydration of urea to ammonia at a temperature between 150 and 220° C. -
FIGS. 3a and 3b show the activity of the close couplet SCR/DOC catalyst according to the invention at two different temperature intervals. - As apparent from
FIG. 3a , in a temperature range of between 150 and 220° C., a certain amount of urea is hydrolysed over the first vanadium oxide/TiO2 (SCR) catalyst and ammonia is formed. Ammonia reacts then with NOx on the second Pt/TiO2 (DOC) catalyst, which is SCR active in that temperature range. Both the NOx and ammonia concentration is reduced in the oxidation catalyst due to the SCR reaction. - When the temperature increases to 220° C. or higher as shown in
FIG. 3b , the first SCR catalyst becomes more active. The reaction zone is moved towards the front of the catalyst and no SCR reaction occurs on the DOC catalyst. The formed ammonia concentration is reacted with NOx and both reactants are reduced due to the SCR reaction.
Claims (9)
1-8. (canceled)
9. A system for cleaning an exhaust gas from a compression ignition engine, comprising
a first catalyst, which is a selective catalytic reduction (SCR) catalyst comprising vanadium oxide supported on titania,
a second catalyst, which is a diesel oxidation (DOC) catalyst comprising platinum on titania and/or alumina, close coupled with the first catalyst, and
a urea injector arranged upstream of the first catalyst,
wherein the first catalyst is arranged close to the compression ignition engine such that exhaust gas therefrom heats the first catalyst to a first temperature resulting in catalytic hydrolysis of aqueous urea into ammonia and then heats the second catalyst to a second temperature resulting in catalytic reduction of NOx,
said system is capable of operating in a first mode and a second mode, wherein
in the first mode of operation the exhaust gas comprising the aqueous urea solution reaches an exhaust gas temperature of between 150 and 220° C. and (a) the aqueous urea solution is catalytically hydrolysed to an ammonia reducing agent by contacting with the first catalyst and (b) a part of the nitrogen oxides contained in the exhaust gas are subsequently removed in the exhaust gas mixed with the ammonia reducing agent by contacting with the second catalyst arranged downstream of the first catalyst; and
in the second mode of operation the exhaust gas comprising the aqueous urea solution reaches an exhaust gas temperature above 220° C. and (a) the aqueous urea solution is decomposed to the ammonia reducing agent and a part of the nitrogen oxides contained in the exhaust gas is removed by reacting the part of the nitrogen oxides with the ammonia reducing agent in presence of the first catalyst and (b) subsequently oxidising hydrocarbons, carbon monoxide, and ammonia in the exhaust gas leaving the first catalyst by contacting the exhaust gas with the second catalyst.
10. The system of claim 9 , wherein the first catalyst further comprises tungsten oxide.
11. The system of claim 9 , wherein the second catalyst further comprises palladium.
12. The system of claim 9 , wherein an ammonia oxidation catalyst is layered on at least part of the second catalyst.
13. The system of claim 12 , wherein the ammonia oxidation catalyst comprises platinum and zeolites promoted with iron and/or copper.
14. The system of claim 9 , wherein the first catalyst further comprises a zeolite SCR catalyst.
15. The system of claim 14 , wherein the zeolite SCR catalyst comprises at least one of Y-zeolite, beta-zeolite, SAPO-zeolites and chabazites.
16. The system of claim 9 , wherein the first catalyst and second catalyst are arranged in a single catalyst unit.
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US16/453,385 US20190321782A1 (en) | 2014-02-28 | 2019-06-26 | Method for the Cleaning of Exhaust Gas from a Compression Ignition Engine |
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DKPA201470092 | 2014-02-28 | ||
DKPA201470092 | 2014-02-28 | ||
PCT/EP2015/053568 WO2015128247A1 (en) | 2014-02-28 | 2015-02-20 | Method for the cleaning of exhaust gas from a compression ignition engine |
US201615116347A | 2016-08-03 | 2016-08-03 | |
US16/453,385 US20190321782A1 (en) | 2014-02-28 | 2019-06-26 | Method for the Cleaning of Exhaust Gas from a Compression Ignition Engine |
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US15/116,347 Continuation US10399036B2 (en) | 2014-02-28 | 2015-02-20 | Method for the cleaning of exhaust gas from a compression ignition engine |
PCT/EP2015/053568 Continuation WO2015128247A1 (en) | 2014-02-28 | 2015-02-20 | Method for the cleaning of exhaust gas from a compression ignition engine |
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US16/453,385 Abandoned US20190321782A1 (en) | 2014-02-28 | 2019-06-26 | Method for the Cleaning of Exhaust Gas from a Compression Ignition Engine |
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US (2) | US10399036B2 (en) |
EP (1) | EP3110530A1 (en) |
CN (2) | CN106062333B (en) |
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BR (1) | BR112016019709B1 (en) |
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KR102517482B1 (en) | 2015-07-09 | 2023-04-04 | 우미코레 아게 운트 코 카게 | System for removing particulate matter and harmful compounds from engine exhaust |
EP3484602B1 (en) | 2016-07-14 | 2020-02-19 | Umicore AG & Co. KG | Vanadium trapping scr system |
JP7408392B2 (en) * | 2016-10-24 | 2024-01-05 | ビーエーエスエフ コーポレーション | Integrated SCR catalyst and LNT for NOx reduction |
CN111742121B (en) * | 2018-02-19 | 2022-08-16 | 巴斯夫公司 | Exhaust treatment system with upstream SCR catalyst |
US11511228B2 (en) * | 2018-11-02 | 2022-11-29 | Basf Corporation | Exhaust treatment system for a lean burn engine |
EP3741449A1 (en) * | 2019-05-21 | 2020-11-25 | Haldor Topsøe A/S | A process for the removal of dinitrogen oxide in process off-gas |
US11156143B2 (en) | 2019-10-28 | 2021-10-26 | Caterpillar Inc. | Aftertreatment system and method |
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- 2015-02-20 AR ARP150100493A patent/AR099507A1/en unknown
- 2015-02-20 WO PCT/EP2015/053568 patent/WO2015128247A1/en active Application Filing
- 2015-02-20 BR BR112016019709-7A patent/BR112016019709B1/en active IP Right Grant
- 2015-02-20 RU RU2016138322A patent/RU2687854C2/en active
- 2015-02-20 CN CN202111213936.9A patent/CN113958387A/en active Pending
- 2015-02-20 EP EP15705999.9A patent/EP3110530A1/en active Pending
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US20160346733A1 (en) | 2016-12-01 |
BR112016019709A2 (en) | 2018-07-17 |
US10399036B2 (en) | 2019-09-03 |
RU2687854C2 (en) | 2019-05-16 |
BR112016019709B1 (en) | 2022-06-28 |
WO2015128247A1 (en) | 2015-09-03 |
RU2016138322A (en) | 2018-03-29 |
CN106062333B (en) | 2021-11-09 |
EP3110530A1 (en) | 2017-01-04 |
AR099507A1 (en) | 2016-07-27 |
CN106062333A (en) | 2016-10-26 |
RU2016138322A3 (en) | 2018-10-18 |
CN113958387A (en) | 2022-01-21 |
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