US20090260346A1 - Method for purification of an exhaust gas from a diesel engine - Google Patents
Method for purification of an exhaust gas from a diesel engine Download PDFInfo
- Publication number
- US20090260346A1 US20090260346A1 US12/421,947 US42194709A US2009260346A1 US 20090260346 A1 US20090260346 A1 US 20090260346A1 US 42194709 A US42194709 A US 42194709A US 2009260346 A1 US2009260346 A1 US 2009260346A1
- Authority
- US
- United States
- Prior art keywords
- catalyst
- exhaust gas
- support
- particulate matter
- reductant
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000000746 purification Methods 0.000 title description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000007789 gas Substances 0.000 claims abstract description 48
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 39
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 37
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000013618 particulate matter Substances 0.000 claims abstract description 28
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 22
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 13
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910001868 water Inorganic materials 0.000 claims abstract description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004202 carbamide Substances 0.000 claims abstract description 9
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 230000000717 retained effect Effects 0.000 claims abstract description 3
- 239000003054 catalyst Substances 0.000 claims description 77
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 30
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 20
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 16
- 239000010457 zeolite Substances 0.000 claims description 16
- 229910021536 Zeolite Inorganic materials 0.000 claims description 14
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 14
- 239000010970 precious metal Substances 0.000 claims description 14
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 13
- 239000010953 base metal Substances 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 10
- 150000004706 metal oxides Chemical class 0.000 claims description 10
- 229910052763 palladium Inorganic materials 0.000 claims description 10
- 229910052697 platinum Inorganic materials 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 229910052878 cordierite Inorganic materials 0.000 claims description 5
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 5
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 4
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims description 4
- 229910001930 tungsten oxide Inorganic materials 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 4
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 150000002500 ions Chemical group 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000002283 diesel fuel Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000010948 rhodium Substances 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910001935 vanadium oxide Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims 4
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 5
- 229910002089 NOx Inorganic materials 0.000 description 18
- 238000006722 reduction reaction Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- SHPBBNULESVQRH-UHFFFAOYSA-N [O-2].[O-2].[Ti+4].[Zr+4] Chemical compound [O-2].[O-2].[Ti+4].[Zr+4] SHPBBNULESVQRH-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 229910021650 platinized titanium dioxide Inorganic materials 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 102100035353 Cyclin-dependent kinase 2-associated protein 1 Human genes 0.000 description 1
- -1 catalytic oxidation Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052742 iron Chemical group 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006902 nitrogenation reaction Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
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]
-
- 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
- B01D53/9459—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
- B01D53/9477—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 separate bricks, e.g. exhaust systems
-
- 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
- F01N13/0097—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 arranged in a single housing
-
- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
- F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/208—Hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1023—Palladium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20723—Vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20761—Copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/904—Multiple catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
-
- 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 relates to a method for purification of an exhaust gas from an internal combustion engine.
- the invention is specifically directed to cleaning of an exhaust gas from a diesel engine, especially engines in vehicles, which often start with cold engine and cold exhaust gas system.
- Gas is led from a combustion engine to a diesel particulate filter in the process disclosed in US 2007/0089403, where the filter is coated with an oxidation/NO x storage catalyst. After injection of a reductant the gas passes a hydrolysis catalyst before entering a selective reduction catalyst, after which it passes an ammonia guard catalyst and streams to the atmosphere. This process is a little complicated, the gas to the selective reduction is not sufficiently hot and must pass a hydrolysis catalyst before entering the reduction catalyst, after which an ammonia guard catalyst is needed.
- US 2006/0107649 discloses an exhaust gas cleaning process, where NO x is reduced, particles are caught in a filter and CO, hydrocarbons and NO x are thereafter oxidised. However, no additional heat can be added to the filter to burn off caught soot and particulate matter.
- Exhaust gas is cleaned in two parallel trains in the process disclosed in U.S. Pat. No. 6,823,660. In each train the gas passes an oxidation catalyst, a diesel particulate filter and a selectively reducing catalyst. This process does not supply sufficient heat for regeneration of the filter and control of NO x reduction.
- Reduction and subsequent oxidation of impurities in exhaust gas are comprised in the process of U.S. Pat. No. 5,431,893.
- Reductant is injected to the exhaust gas upstream of a pyrolysation channel, a mixing channel and a reduction catalyst.
- the temperature of the oxidation catalyst cannot be adjusted, and particles may block the filter or pass through the filter.
- the invention provides a method for removing impurities in exhaust gas from a diesel engine, where the impurities comprise nitrogen oxides, carbon monoxide, particulate matter and incompletely combusted hydrocarbons.
- the method comprises the steps of injection in excess compared to stoichiometric ratio of a reductant comprising urea or ammonia into the exhaust gas from the engine, selective catalytic reduction of the nitrogen oxides in the exhaust gas by the reductant in the presence of a catalyst active in selective reduction of nitrogen oxides to nitrogen and intermittent injection of a hydrocarbon into this effluent.
- the succeeding steps are oxidation of carbon monoxide, particulate matter, incompletely combusted hydrocarbons and injected hydrocarbon in the presence of a catalyst active in oxidising carbon monoxide, particulate matter and hydrocarbons, to carbon dioxide and water, and in selectively oxidising possible excess of reductant to free nitrogen, and filtration of the effluent by passing the gas through a catalysed filter, wherein the remaining particulate matter is retained in the filter, and wherein the catalyst is active in oxidising carbon monoxide, particulate matter and hydrocarbons to carbon dioxide and water, and in selectively oxidising reductant to nitrogen creating a purified exhaust gas.
- the method further comprises the step of a pre-oxidation of carbon monoxide, particulate matter, nitrogen oxides and incompletely combusted hydrocarbons in the exhaust gas from the engine in the presence of a catalyst active in oxidising the carbon monoxide, nitrogen oxides, hydrocarbons and particulate matter to carbon dioxide, nitrogen dioxide and water prior to the injection of reductant.
- FIG. 1 is a schematic drawing showing one preferred embodiment of the method of the invention.
- FIG. 2 is a schematic drawing showing another preferred embodiment of the method of the invention.
- FIG. 3 is a print-out from measurement of pressure drop across diesel particle filter during test.
- Diesel engines operate with excess air and their exhaust gasses comprise nitrogen oxides, NO x , carbon monoxide, CO, particulate matter and incompletely combusted hydrocarbons, which all implement health risk.
- the present invention provides a method, wherein nitrogen oxides are catalytically, selectively reduced to free nitrogen. Subsequently CO and incompletely combusted hydrocarbons are oxidised. Finally, particulate matter is caught and remaining CO and incompletely combusted hydrocarbons are oxidised in a filter. These reactions take place in an optimal way, when the exhaust gas and the system are heated up to 250-500° C.
- the exhaust gas from the diesel engine is passed to a pre-oxidising catalyst, where a considerable part of carbon monoxide, unburned hydrocarbons, particulate matter, and NO x is oxidised to carbon dioxide, water and NO 2 upstream of the selective, catalytic reduction of NO x .
- the reduction catalyst can be a zeolites catalyst.
- FIG. 1 illustrates one preferred embodiment of the invention, where fuel 1 is combusted with air 2 in combustion engine 3 , and the formed exhaust gas 4 is mixed with injected reductant 7 .
- a preferred reductant is an aqueous solution of urea, which disintegrates to ammonia and carbon dioxide at and above 200° C.
- This mixed gas flows to a Selective, Catalytic Reduction, SCR, catalyst 8 , which promotes reduction of nitrogen oxides by the reductant, ammonia, resulting in free nitrogen and water.
- the catalyst for selective reduction can be a mixture of base metal oxides as the active phase supported on a carrier of one or more metal oxides.
- the base metals are chosen from vanadium, tungsten, cerium and manganese, and the preferred catalysts are vanadium and tungsten oxide supported on titania or alumina or ceria, or cerium oxide/tungsten oxide supported on titania or alumina, or manganese oxide supported on titania or alumina or ceria.
- the catalyst for selective reduction can be a zeolite, especially an ion exchanged zeolite supported on an inert substrate, preferably cordierite, and the preferred zeolites is copper and/or iron exchanged beta or ZSM-5 zeolite.
- the catalyst will typically be in the form of a monolithic structure but can also be in the form of foam or metal mesh.
- the reductant might also be ammonia or an aqueous solution of ammonia.
- the reductant can be added in a slight excess compared to stoichiometric ratio, which ensures a very high degree of conversion of the poisonous nitrogen oxides to free nitrogen.
- Hydrocarbon 10 is intermittently injected into SCR effluent 9 , when needed for increasing the temperature.
- the hydrocarbon can be diesel fuel.
- This exhaust gas flows to a Diesel Oxidation Catalyst, DOC, 11 where a substantial part of the CO and incompletely combusted hydrocarbons and particulate matter are oxidised to water and carbon dioxide. Excess of ammonia is selectively oxidised to free nitrogen. In this way, the DOC 11 also acts as an ammonia slip guard.
- the oxidation catalyst is a precious metal(s) catalyst on metal oxide carriers such as aluminium oxide, cerium oxide, zirconium oxide titanium oxide or a zeolite.
- metal oxide carriers such as aluminium oxide, cerium oxide, zirconium oxide titanium oxide or a zeolite.
- the requirement to the amount of the noble metal is low.
- Precious metals are platinum, palladium or rhodium, which are present as mixtures or as single precious elements, where platinum and palladium are the preferred metals, preferably on a titania support.
- the precious metals can also be substituted by base metals, typically manganese, copper, cobalt and chromium.
- the DOC catalyst will typically be in the form of a monolithic structure, but can also be in the form of foam or metal mesh.
- Both the amount of reductant and of hydrocarbon is monitored by the electronic computing unit. This can both be a separate CPU or the CPU of the engine.
- the nearly purified exhaust gas 12 flows to a catalysed Diesel Particulate Filter, c-DPF, 13 .
- Particulate matter is caught in the filter and the catalyst on the surface of the filter promotes the oxidation of the particles as well as the selective oxidation of remaining ammonia, carbon monoxide and hydrocarbons.
- the catalyst is a Pt-free coat on the filter, which can be a cordierite filter.
- the coat is a metal oxide acting as a carrier for a precious metal different from platinum, where the preferred precious metal is palladium.
- the carrier coat is an oxide of cerium, zirconium, aluminium or titanium, where the preferred oxide is titania.
- the amount of hydrocarbons 10 injected up-stream of DOC 11 will influence the temperature not only in the DOC 11 , but also in the c-DPF 13 as well and thereby enhance combustion of collected particles by the increased temperature of c-DPF.
- the catalyst 8 for SCR is readily heated by warm exhaust gas coming directly from the engine to the temperature, where urea is disintegrated to ammonia and where nitrogen oxides are reduced.
- FIG. 2 shows another preferred embodiment of the invention.
- Fuel 1 is combusted by air 2 in diesel engine 3 and the formed exhaust gas 4 flows to a pre-oxidising catalyst 5 , where a substantial part of CO, NO, particulate matter and remaining HC are oxidised, before this pre-oxidised exhaust gas 6 is mixed with reductant 7 and flows to SCR catalyst 8 , where nitrogen oxides are reduced to free nitrogen.
- the NO x free exhaust gas 9 is further cleaned in the same way as in the process described by FIG. 1 .
- the formed nitrogen dioxide supports the selective, catalytic reduction of nitrogen oxides to free nitrogen and that a zeolite catalyst can be used for the SCR reaction.
- the pre-oxidising catalyst 5 consists of precious metals on one or more metal oxide carriers as aluminium oxide, cerium oxide, zirconium oxide titanium oxide or a zeolite where the requirement to the amount of the noble metal is low.
- This catalyst shall have the ability to oxidise NO to NO 2 besides the ability to oxidise carbon monoxide and hydrocarbons to carbon dioxide and water.
- a preferred catalyst is a mixture of the precious metals platinum and palladium on aluminium oxide/cerium oxide carrier.
- the precious metals can be mixtures or single precious elements.
- the precious metals may be substituted by base metals including manganese, copper, cobalt and chromium.
- the pre-DOC catalyst will typically be in the form of a monolithic structure but can also be in the form of foam or metal mesh.
- the method of the invention is useful for systems for purifying exhaust gas from diesel engines, especially engines installed in cars, vans, vehicles, trains, vessels and power plants.
- the amount of injected urea solution was varied as shown in Table 2, whereas no hydrocarbon was injected upstream of the DOC.
- the catalysts used for the evaluation were from current Haldor Topsoe A/S development:
- the efficiency of removal of particulate matter was determined as build-up of pressure drop across the filter and given in FIG. 3 .
- Euro VI European Transient Cycle
- test results show clearly that particulate matter is oxidised, as it can be seen in FIG. 3 that the pressure drop across the c-DPF does not increase during operation, as shown.
- the engine which was used for the tests, was an old engine and the emission of impurities was much higher that the emission from modern engines.
- the purification system of the invention will easily fulfil future Euro VI requirements for limits of emissions from modern vehicles.
Abstract
A method for removing impurities in exhaust gas from a diesel engine, where the impurities comprise nitrogen oxides, carbon monoxide, particulate matter and incompletely combusted hydrocarbons. The method comprises the steps of injection of a reductant comprising urea or ammonia into the exhaust gas from the engine, selective catalytic reduction of the nitrogen oxides in the exhaust gas by the reductant, and intermittent injection of a hydrocarbon into this effluent. The succeeding steps are oxidation of carbon monoxide, particulate matter, incompletely combusted hydrocarbons and injected hydrocarbon to carbon dioxide and water, and in selectively oxidising possible excess of reductant to free nitrogen, and finally filtration of the effluent by passing the gas through a catalysed filter. The remaining particulate matter is retained in the filter, and the carbon monoxide, particulate matter and hydrocarbons are oxidixed to carbon dioxide and water, and the reductant is selectively oxidixed to nitrogen, creating a purified exhaust gas.
Description
- The invention relates to a method for purification of an exhaust gas from an internal combustion engine.
- The invention is specifically directed to cleaning of an exhaust gas from a diesel engine, especially engines in vehicles, which often start with cold engine and cold exhaust gas system.
- Processes for purifying exhaust gas are already known. In the process of US 2007/0289289 exhaust gas is purified by catching particles in a filter followed by reduction of nitrogen oxides and thereafter by catalytic oxidation of impurities in the exhaust gas. However, if some nitrogen oxides pass the reducing catalyst, they are oxidised in the subsequent step and escape to the atmosphere as NO2. Further, if excess of a reductant is added, some of it may pass the oxidation catalyst and escape to the atmosphere.
- In the process of US 2007/0160508 fuel is injected upstream of a pre-stage oxidation catalyst, in which NO2 is formed. NO2 is used in the subsequent filter for oxidising soot particles. Remaining NOx is reduced by a reductant in the subsequent selective reducing catalyst, before the exhaust gas passes a post-stage oxidation catalyst, which converts CO to CO2. In this process four different catalysts are needed.
- Gas is led from a combustion engine to a diesel particulate filter in the process disclosed in US 2007/0089403, where the filter is coated with an oxidation/NOx storage catalyst. After injection of a reductant the gas passes a hydrolysis catalyst before entering a selective reduction catalyst, after which it passes an ammonia guard catalyst and streams to the atmosphere. This process is a little complicated, the gas to the selective reduction is not sufficiently hot and must pass a hydrolysis catalyst before entering the reduction catalyst, after which an ammonia guard catalyst is needed.
- US 2006/0107649 discloses an exhaust gas cleaning process, where NOx is reduced, particles are caught in a filter and CO, hydrocarbons and NOx are thereafter oxidised. However, no additional heat can be added to the filter to burn off caught soot and particulate matter.
- The process of U.S. Pat. No. 6,892,529 comprises hydrogen injection, catalytic oxidation, hydrogen injection, removing particles in a filter, hydrogen injection, urea injection, hydrolysis, selective reduction of NOx and oxidation of CO and remaining hydrocarbons. A disadvantage of this process is that hydrogen is not easy to handle on board a vehicle.
- Exhaust gas is cleaned in two parallel trains in the process disclosed in U.S. Pat. No. 6,823,660. In each train the gas passes an oxidation catalyst, a diesel particulate filter and a selectively reducing catalyst. This process does not supply sufficient heat for regeneration of the filter and control of NOx reduction.
- Reduction and subsequent oxidation of impurities in exhaust gas are comprised in the process of U.S. Pat. No. 5,431,893. Reductant is injected to the exhaust gas upstream of a pyrolysation channel, a mixing channel and a reduction catalyst. The temperature of the oxidation catalyst cannot be adjusted, and particles may block the filter or pass through the filter.
- The problem of the known processes is that they are either rather complicated or do not provide a thorough removal of both NOx, CO, remains of hydrocarbons, particulate matter and soot, especially not just after start of a cold engine.
- The problem of known technique is solved by the present invention.
- The invention provides a method for removing impurities in exhaust gas from a diesel engine, where the impurities comprise nitrogen oxides, carbon monoxide, particulate matter and incompletely combusted hydrocarbons. The method comprises the steps of injection in excess compared to stoichiometric ratio of a reductant comprising urea or ammonia into the exhaust gas from the engine, selective catalytic reduction of the nitrogen oxides in the exhaust gas by the reductant in the presence of a catalyst active in selective reduction of nitrogen oxides to nitrogen and intermittent injection of a hydrocarbon into this effluent. The succeeding steps are oxidation of carbon monoxide, particulate matter, incompletely combusted hydrocarbons and injected hydrocarbon in the presence of a catalyst active in oxidising carbon monoxide, particulate matter and hydrocarbons, to carbon dioxide and water, and in selectively oxidising possible excess of reductant to free nitrogen, and filtration of the effluent by passing the gas through a catalysed filter, wherein the remaining particulate matter is retained in the filter, and wherein the catalyst is active in oxidising carbon monoxide, particulate matter and hydrocarbons to carbon dioxide and water, and in selectively oxidising reductant to nitrogen creating a purified exhaust gas.
- In another embodiment of the invention the method further comprises the step of a pre-oxidation of carbon monoxide, particulate matter, nitrogen oxides and incompletely combusted hydrocarbons in the exhaust gas from the engine in the presence of a catalyst active in oxidising the carbon monoxide, nitrogen oxides, hydrocarbons and particulate matter to carbon dioxide, nitrogen dioxide and water prior to the injection of reductant.
- Thereby exhaust gas from a diesel engine is very thoroughly cleaned by a very simple system, also reasonably fast after start of a cold engine.
-
FIG. 1 is a schematic drawing showing one preferred embodiment of the method of the invention. -
FIG. 2 is a schematic drawing showing another preferred embodiment of the method of the invention. -
FIG. 3 is a print-out from measurement of pressure drop across diesel particle filter during test. - Diesel engines operate with excess air and their exhaust gasses comprise nitrogen oxides, NOx, carbon monoxide, CO, particulate matter and incompletely combusted hydrocarbons, which all implement health risk.
- The present invention provides a method, wherein nitrogen oxides are catalytically, selectively reduced to free nitrogen. Subsequently CO and incompletely combusted hydrocarbons are oxidised. Finally, particulate matter is caught and remaining CO and incompletely combusted hydrocarbons are oxidised in a filter. These reactions take place in an optimal way, when the exhaust gas and the system are heated up to 250-500° C.
- Optionally, the exhaust gas from the diesel engine is passed to a pre-oxidising catalyst, where a considerable part of carbon monoxide, unburned hydrocarbons, particulate matter, and NOx is oxidised to carbon dioxide, water and NO2 upstream of the selective, catalytic reduction of NOx.
- In this case the reduction catalyst can be a zeolites catalyst.
- The invention is described in more detail by the drawings.
FIG. 1 illustrates one preferred embodiment of the invention, wherefuel 1 is combusted withair 2 incombustion engine 3, and the formedexhaust gas 4 is mixed with injectedreductant 7. A preferred reductant is an aqueous solution of urea, which disintegrates to ammonia and carbon dioxide at and above 200° C. This mixed gas flows to a Selective, Catalytic Reduction, SCR,catalyst 8, which promotes reduction of nitrogen oxides by the reductant, ammonia, resulting in free nitrogen and water. - The catalyst for selective reduction can be a mixture of base metal oxides as the active phase supported on a carrier of one or more metal oxides. The base metals are chosen from vanadium, tungsten, cerium and manganese, and the preferred catalysts are vanadium and tungsten oxide supported on titania or alumina or ceria, or cerium oxide/tungsten oxide supported on titania or alumina, or manganese oxide supported on titania or alumina or ceria. Alternatively, the catalyst for selective reduction can be a zeolite, especially an ion exchanged zeolite supported on an inert substrate, preferably cordierite, and the preferred zeolites is copper and/or iron exchanged beta or ZSM-5 zeolite. The catalyst will typically be in the form of a monolithic structure but can also be in the form of foam or metal mesh.
- The reductant might also be ammonia or an aqueous solution of ammonia. The reductant can be added in a slight excess compared to stoichiometric ratio, which ensures a very high degree of conversion of the poisonous nitrogen oxides to free nitrogen.
-
Hydrocarbon 10 is intermittently injected intoSCR effluent 9, when needed for increasing the temperature. The hydrocarbon can be diesel fuel. This exhaust gas flows to a Diesel Oxidation Catalyst, DOC, 11 where a substantial part of the CO and incompletely combusted hydrocarbons and particulate matter are oxidised to water and carbon dioxide. Excess of ammonia is selectively oxidised to free nitrogen. In this way, the DOC 11 also acts as an ammonia slip guard. - The oxidation catalyst is a precious metal(s) catalyst on metal oxide carriers such as aluminium oxide, cerium oxide, zirconium oxide titanium oxide or a zeolite. The requirement to the amount of the noble metal is low. Precious metals are platinum, palladium or rhodium, which are present as mixtures or as single precious elements, where platinum and palladium are the preferred metals, preferably on a titania support.
- The precious metals can also be substituted by base metals, typically manganese, copper, cobalt and chromium.
- The DOC catalyst will typically be in the form of a monolithic structure, but can also be in the form of foam or metal mesh.
- Both the amount of reductant and of hydrocarbon is monitored by the electronic computing unit. This can both be a separate CPU or the CPU of the engine.
- The nearly purified
exhaust gas 12 flows to a catalysed Diesel Particulate Filter, c-DPF, 13. Particulate matter is caught in the filter and the catalyst on the surface of the filter promotes the oxidation of the particles as well as the selective oxidation of remaining ammonia, carbon monoxide and hydrocarbons. - The catalyst is a Pt-free coat on the filter, which can be a cordierite filter. The coat is a metal oxide acting as a carrier for a precious metal different from platinum, where the preferred precious metal is palladium. The carrier coat is an oxide of cerium, zirconium, aluminium or titanium, where the preferred oxide is titania.
- The amount of
hydrocarbons 10 injected up-stream ofDOC 11 will influence the temperature not only in theDOC 11, but also in the c-DPF 13 as well and thereby enhance combustion of collected particles by the increased temperature of c-DPF. - By the exhaust gas cleaning process of the invention, the
catalyst 8 for SCR is readily heated by warm exhaust gas coming directly from the engine to the temperature, where urea is disintegrated to ammonia and where nitrogen oxides are reduced. - Further, a very high degree of removal of nitrogen oxides can be obtained, as it is possible to inject excess of urea/ammonia reductant, and without high requirement of accuracy of injected amount, because slip of ammonia is oxidised to nitrogen not only by the
DOC 11, but also by the c-DPF 13. - Thereby, the content of impurities in the purified
exhaust gas stream 14 is extremely low, when it leaves the system.FIG. 2 shows another preferred embodiment of the invention.Fuel 1 is combusted byair 2 indiesel engine 3 and the formedexhaust gas 4 flows to apre-oxidising catalyst 5, where a substantial part of CO, NO, particulate matter and remaining HC are oxidised, before thispre-oxidised exhaust gas 6 is mixed withreductant 7 and flows toSCR catalyst 8, where nitrogen oxides are reduced to free nitrogen. The NOxfree exhaust gas 9 is further cleaned in the same way as in the process described byFIG. 1 . With this embodiment it is obtained that the formed nitrogen dioxide supports the selective, catalytic reduction of nitrogen oxides to free nitrogen and that a zeolite catalyst can be used for the SCR reaction. - The
pre-oxidising catalyst 5 consists of precious metals on one or more metal oxide carriers as aluminium oxide, cerium oxide, zirconium oxide titanium oxide or a zeolite where the requirement to the amount of the noble metal is low. This catalyst shall have the ability to oxidise NO to NO2 besides the ability to oxidise carbon monoxide and hydrocarbons to carbon dioxide and water. A preferred catalyst is a mixture of the precious metals platinum and palladium on aluminium oxide/cerium oxide carrier. The precious metals can be mixtures or single precious elements. The precious metals may be substituted by base metals including manganese, copper, cobalt and chromium. - The pre-DOC catalyst will typically be in the form of a monolithic structure but can also be in the form of foam or metal mesh.
- The method of the invention is useful for systems for purifying exhaust gas from diesel engines, especially engines installed in cars, vans, vehicles, trains, vessels and power plants.
- The performance of a system consisting of SCR+DOC+c-DPF catalysts was evaluated in an Engine test bench on a Scania 12-1 Euro II engine through European transient test cycles, ETC.
- The amount of injected urea solution was varied as shown in Table 2, whereas no hydrocarbon was injected upstream of the DOC.
- Finally, the exhaust gas was passed through catalysed DPF.
- The catalysts used for the evaluation were from current Haldor Topsoe A/S development:
-
- DNXV standard SCR catalyst—vanadium based
- Hi-DOC—Pt/TiO2 oxidation catalyst
- BMC-211 coated cordierite DPF
- Further specifications of SCR, DOC and DPF are given in Table 1.
-
TABLE 1 Catalyst Volume to cylinder Size (litres) ratio Composition DNXV ø12.7″ × 295 mm 24 2 V2O5/WO3 on SCR TiO2 DOC ø10.5″ × 100 mm 5.6 0.46 Pt/TiO2 DPF ø10.5″ × 12″ 17 1.42 BMC-211: Pt-free coat on cordierite filter - The measured concentrations of impurities and the temperature in the streams are given in Table 2.
-
TABLE 2 Urea CO Nox HC inj CO NOx HC Max NH3 conv conv conv [g] [g/kWh] [g/kWh] [g/kWh] [ppm] [%] [%] [%] Upstream SCR 10 3.26 10.14 3.88 0.00 Upstream SCR 20 3.82 10.17 4.19 0.00 Downstream SCR 0 3.16 10.85 0.02 0.00 3 −7 99 Downstream DOC 0 0.20 10.58 0.03 0.00 94 −4 99 Downstream 0 0.14 9.88 0.00 0.00 96 3 100 Filter Downstream SCR 586 3.40 4.09 0.02 9.56 −4 60 100 Downstream SCR 809 3.33 1.85 0.02 17.96 −2 82 100 Downstream SCR 929 3.41 0.98 0.03 159.00 −5 90 99 Downstream SCR 1 033 3.17 0.52 0.03 392.06 3 95 99 Downstream SCR 1 169 3.39 0.57 0.03 473.00 −4 94 99 Downstream SCR 1 307 3.27 0.40 0.03 643.00 0 96 99 Downstream DOC 815 0.21 1.82 −0.01 3.29 93 82 100 Downstream 813 0.15 1.71 −0.01 3.44 96 83 100 Filter Downstream DOC 925 0.18 1.26 0.01 3.09 95 88 100 Downstream 902 0.40 1.31 0.01 7.32 88 87 100 Filter Downstream DOC 1 041 0.19 1.29 0.01 3.86 94 87 100 Downstream 1 042 0.17 1.24 0.07 4.39 95 88 98 Filter - The efficiency of removal of particulate matter was determined as build-up of pressure drop across the filter and given in
FIG. 3 . - The allowed values for emissions from trucks in Europe are given in Table 3.
-
TABLE 3 European legislation based on the European Transient Cycle (ETC). Euro VI is a proposal of 2007.12.21. All units are in g/kWh Tier Date Test CO NMHC CH4 NOx PM Euro III 2000.10 ETC 5.45 0.78 1.6 5.0 0.16 Euro IV 2005.10 4.0 0.55 1.1 3.5 0.03 Euro V 2008.10 4.0 0.55 1.1 2.0 0.03 Euro VI 2013.04 4.0 0.16 0.5 0.4 0.01 - The test results show clearly that particulate matter is oxidised, as it can be seen in
FIG. 3 that the pressure drop across the c-DPF does not increase during operation, as shown. - From Table 2 it is seen that the HC, CO and NOx conversions are excellent and that the NOx emission in the
outlet exhaust stream 14 is very low. The main reason for the high NOx conversion is the NH3/NOx ratio can be maintained at a high value as the potential NH3 slip is selectively oxidised both on theDOC 11 and on the catalyticcoated filter 13. - A comparison between the limits of present legislation in Table 3 and test results shows:
- The obtained 1.24-1.71 g/kWh NOx is lower than 2.0 (2008)
- The obtained 0.15-0.40 g/kWh CO is lower than 4.0 (2008)
- The obtained 0-0.07 g/kWh HC is lower than 1.1 (2008).
- The above clearly demonstrates that the legislation is fulfilled.
- The engine, which was used for the tests, was an old engine and the emission of impurities was much higher that the emission from modern engines. The purification system of the invention will easily fulfil future Euro VI requirements for limits of emissions from modern vehicles.
Claims (15)
1. A method for removing impurities in exhaust gas from a diesel engine, where the impurities comprise nitrogen oxides, carbon monoxide, particulate matter and incompletely combusted hydrocarbons,
which method comprises the steps of
(a) injection in excess compared to stoichiometric ratio of a reductant comprising urea or ammonia into the exhaust gas from the engine;
(b) reduction of the nitrogen oxides in the exhaust gas by the reductant in the presence of a catalyst active in selective reduction of nitrogen oxides to nitrogen;
(c) intermittent injection of a hydrocarbon into the effluent from step (b);
(d) oxidation of carbon monoxide, particulate matter, incompletely combusted hydrocarbons and injected hydrocarbon in the presence of a catalyst active in oxidising carbon monoxide, particulate matter and hydrocarbons, to carbon dioxide and water, and in selectively oxidising excess of reductant to free nitrogen;
(e) filtration of the effluent from step (d) by passing the gas through a catalysed filter, wherein the remaining particulate matter is retained in the filter, and wherein the catalyst is active in oxidising carbon monoxide, particulate matter and hydrocarbons to carbon dioxide and water, and in selective oxidising reductant to nitrogen, creating a purified exhaust gas; and
(f) withdrawal of the purified exhaust gas.
2. A method according to claim 1 , further comprising the step of a pre-oxidation of carbon monoxide, particulate matter, nitrogen oxides and incompletely combusted hydrocarbons in the exhaust gas from the engine in the presence of a catalyst active in oxidising the carbon monoxide, nitrogen oxides, hydrocarbons, and particulate matter to carbon dioxide, nitrogen dioxide and water prior to the step (a).
3. A method according to claim 1 , wherein the injected hydrocarbon is diesel fuel.
4. A method according to claim 1 , wherein the catalyst for selective reduction is a zeolite or an ion exchanged zeolite on a cordierite catalyst support, or one or more base metal oxides catalyst on a catalyst support of one or more metal oxides, the catalyst having the form of a monolite, a foam or a metal mesh.
5. A method according to claim 1 , wherein the oxidation catalyst is one or more precious metals or one or more base metals on a catalyst support of a zeolite or a metal oxide, the catalyst having the form of a monolite, a foam or a metal mesh.
6. A method according to claim 1 , wherein the catalyst coated on the filter is a precious metal, but not including platinum, and on a catalyst support of a metal oxide.
7. A method according to claim 2 , wherein the preoxidation catalyst is one or more precious metals or one or more base metals on a catalyst support of a zeolite or of an oxide of one or more metals, the catalyst having the form of a monolite, a foam or a metal mesh.
8. A method according to claim 1 , wherein the catalyst base metal is one or more of vanadium, tungsten, cerium and manganese, the support metal oxide is titania, alumina and/or ceria and the ion exchanged zeolite is Cu/Fe exchanged β zeolite or ZSM-5 zeolite.
9. A method according to claim 1 , wherein the support for the oxidation catalyst is a zeolite, titania, alumina, ceria or zirconia, and wherein the catalyst precious metal is platinum, palladium and/or rhodium and the catalyst base metal is manganese, copper, cobalt and/or chromium.
10. A method according to claim 1 , wherein the support for the catalyst is titania, alumina, ceria or zirconia, and the catalyst is palladium.
11. A method according to claim 2 , wherein the catalyst support is one or more oxides of aluminium, cerium, zirconium and/or titanium, and the catalyst precious metal is platinum and/or palladium and the catalyst base metal is manganese, copper, cobalt and/or chromium.
12. A method according to claim 1 , wherein the catalyst is vanadium/tungsten oxide on a titania support, cerium/tungsten oxide on a titania support or manganese oxide on a titania support.
13. A method according to claim 1 , wherein the catalyst is platinum on a titania support or platinum/palladium on a titania support.
14. A method according to claim 1 , wherein the catalyst is palladium on a titania support.
15. A method according to claim 2 , wherein the catalyst is platinum/palladium on an aluminium/cerium oxide support.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA200800575 | 2008-04-22 | ||
DKPA200800575 | 2008-04-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090260346A1 true US20090260346A1 (en) | 2009-10-22 |
Family
ID=40863620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/421,947 Abandoned US20090260346A1 (en) | 2008-04-22 | 2009-04-10 | Method for purification of an exhaust gas from a diesel engine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090260346A1 (en) |
EP (1) | EP2112341B1 (en) |
CN (1) | CN101564646B (en) |
RU (1) | RU2517714C2 (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100300076A1 (en) * | 2007-10-23 | 2010-12-02 | Pierre Henri Maesse | Process For Controlling The Injection Of Urea In A Selective Catalytic Reduction System |
CN102000507A (en) * | 2010-11-05 | 2011-04-06 | 中国石油大学(北京) | Reducing gas injection and quadruple-effect catalysis purification system for diesel vehicle tail gas treatment |
WO2011100809A1 (en) | 2010-02-19 | 2011-08-25 | Vladko Todorov Panayotov | Method for removing harmful emission from exhaust gases |
US20110239624A1 (en) * | 2010-04-06 | 2011-10-06 | Gm Global Technology Operations, Inc. | Apparatus and method for regenerating an exhaust filter |
US20110283680A1 (en) * | 2009-02-20 | 2011-11-24 | Ioannis Gekas | Method for purification of exhaust gas from a diesel engine |
WO2013104633A1 (en) | 2012-01-09 | 2013-07-18 | Eminox Limited | Exhaust system and method for reducing particulate and no2 emissions |
US8987161B2 (en) | 2010-08-13 | 2015-03-24 | Ut-Battelle, Llc | Zeolite-based SCR catalysts and their use in diesel engine emission treatment |
US9616384B2 (en) | 2014-06-11 | 2017-04-11 | Basf Se | Base metal catalyst |
US9737878B2 (en) | 2007-10-15 | 2017-08-22 | SDCmaterials, Inc. | Method and system for forming plug and play metal catalysts |
GB2552072A (en) * | 2016-05-31 | 2018-01-10 | Johnson Matthey Plc | Vanadium catalysts for high engine-out NO2 systems |
WO2019186485A1 (en) * | 2018-03-29 | 2019-10-03 | Johnson Matthey Public Limited Company | Exhaust system including scrf catalyst with oxidation zone |
WO2020221682A1 (en) * | 2019-04-29 | 2020-11-05 | Basf Corporation | Exhaust gas treatment system for ultra low nox and cold start |
US11149617B2 (en) * | 2016-08-19 | 2021-10-19 | Kohler Co. | System and method for low CO emission engine |
US11338272B2 (en) * | 2019-10-18 | 2022-05-24 | Daeyoung C&E | Catalyst capable of directly decomposing urea and method for urea decomposition using the same |
CN114592958A (en) * | 2021-02-09 | 2022-06-07 | 长城汽车股份有限公司 | Fuel engine tail gas aftertreatment system and method |
US11541379B2 (en) * | 2018-08-31 | 2023-01-03 | Johnson Matthey Public Limited Company | Bimetallic Cu/Mn catalysts for selective catalytic reduction |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102125834B (en) * | 2011-01-14 | 2012-11-28 | 上海交通大学 | Titanium-based nano-composite metal oxide catalyst and preparation method thereof |
US8491860B2 (en) * | 2011-08-17 | 2013-07-23 | Ford Global Technologies, Llc | Methods and systems for an engine emission control system |
CN104520548B (en) * | 2012-04-27 | 2018-09-07 | 优美科两合公司 | Method and system for purifying the exhaust gas from internal combustion engine |
KR101254068B1 (en) * | 2012-10-17 | 2013-04-12 | 대영씨엔이(주) | Selective catalytic reduction element, module produced using the element, and method for manufacturing the same |
CA2899149C (en) * | 2013-02-14 | 2020-03-24 | Haldor Topsoe A/S | Method and catalyst for the simultaneous removal of carbon monoxide and nitrogen oxides from flue or exhaust gas |
GB2512648B (en) * | 2013-04-05 | 2018-06-20 | Johnson Matthey Plc | Filter substrate comprising three-way catalyst |
EP2826971A1 (en) * | 2013-07-17 | 2015-01-21 | DEUTZ Aktiengesellschaft | Method for reducing nitrogen oxides in diesel engine exhaust gases and exhaust gas treatment system for carrying out the method |
CN104018918B (en) * | 2014-06-09 | 2016-08-17 | 盐城工学院 | A kind of diesel engine exhaust gas purification device and preparation method thereof |
CN105056970B (en) * | 2015-08-17 | 2018-12-11 | 中自环保科技股份有限公司 | A kind of preparation method of diesel vehicle catalyst type particle purifying device |
CN106378179A (en) * | 2016-08-18 | 2017-02-08 | 上海歌地催化剂有限公司 | A combined molecular sieve SCR catalyst having a wide temperature window |
TW201838708A (en) * | 2017-03-02 | 2018-11-01 | 丹麥商托普索公司 | Process for the removal of sulphur oxides and nitrogen oxides contained in off-gas from an industrial plant |
EP3707356A4 (en) * | 2017-11-10 | 2021-05-12 | BASF Corporation | Catalyzed soot filter with reduced ammonia oxidation |
DK201700681A1 (en) * | 2017-12-01 | 2019-06-20 | HANS JENSEN GREENTECH ApS | A Selective Catalytic Reduction System and a Method for NOx Reduction |
CN111185167B (en) * | 2020-03-19 | 2021-06-08 | 中国科学院过程工程研究所 | Pt-based catalyst for CO purification and preparation method and application thereof |
CN114575978A (en) * | 2021-02-18 | 2022-06-03 | 长城汽车股份有限公司 | System and method for treating gas containing nitrogen oxide |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3903020A (en) * | 1972-07-14 | 1975-09-02 | Grace W R & Co | Stabilized automotive exhaust gas catalyst |
US5081095A (en) * | 1990-09-10 | 1992-01-14 | General Motors Corporation | Method of making a support containing an alumina-ceria washcoat for a noble metal catalyst |
US5431893A (en) * | 1992-02-24 | 1995-07-11 | Hug; Hans T. | Cleaning exhaust gases from combustion installations |
US6255249B1 (en) * | 1991-11-26 | 2001-07-03 | Engelhard Corporation | Oxidation catalyst and method of use |
US20030167756A1 (en) * | 2002-03-07 | 2003-09-11 | Szymkowicz Patrick G. | After-treatment system and method for reducing emissions in diesel engine exhaust |
US6823660B2 (en) * | 2001-12-13 | 2004-11-30 | Isuzu Motors Limited | Exhaust emission purification system for diesel engine |
US6892529B2 (en) * | 2002-02-25 | 2005-05-17 | Daimlerchrysler Ag | Exhaust-gas purification system for an internal combustion engine |
US20060107649A1 (en) * | 2002-08-26 | 2006-05-25 | Masayuki Kamikawa | Apparatus and method for clarifying exhaust gas of diesel engine |
US20070089403A1 (en) * | 2003-02-26 | 2007-04-26 | Umicore Ag & Co. Kg | Exhaust-gas purification system for the selective catalytic reduction of nitrogen oxides in the lean exhaust gas of internal combustion engines and method of exhaust-gas purification |
US20070160508A1 (en) * | 2005-12-09 | 2007-07-12 | Mitsubishi Fuso Truck And Bus Corporation | Exhaust gas purification device |
US20070277507A1 (en) * | 2006-06-06 | 2007-12-06 | Eaton Corporation | Enhanced hybrid de-NOx system |
US20070289289A1 (en) * | 2006-06-16 | 2007-12-20 | Denso Corporation | Exhaust emission purifier with additive feeder unit and pressurized air introducer unit |
US20080066451A1 (en) * | 2006-09-18 | 2008-03-20 | Jay Warner | Exhaust treatment packaging apparatus, system, and method |
US20080127638A1 (en) * | 2006-12-01 | 2008-06-05 | Marius Vaarkamp | Emission Treatment Systems and Methods |
US20090205322A1 (en) * | 2006-03-03 | 2009-08-20 | Daimler Ag | Exhaust Gas Aftertreatment System and Exhaust Gas Cleaning Method |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4912077A (en) * | 1988-07-15 | 1990-03-27 | Corning Incorporated | Catalytically active materials and method for their preparation |
RU2108140C1 (en) * | 1996-06-24 | 1998-04-10 | Александр Юрьевич Логинов | Method of treating exhaust gases |
ES2250035T3 (en) * | 2000-03-01 | 2006-04-16 | UMICORE AG & CO. KG | CATALYST FOR PURIFICATION OF DIESEL ENGINE EXHAUST GASES AND PROCESS FOR PREPARATION. |
DE10020100A1 (en) * | 2000-04-22 | 2001-10-31 | Dmc2 Degussa Metals Catalysts | Process and catalyst for the reduction of nitrogen oxides |
US6826906B2 (en) * | 2000-08-15 | 2004-12-07 | Engelhard Corporation | Exhaust system for enhanced reduction of nitrogen oxides and particulates from diesel engines |
EP1270886A1 (en) * | 2001-06-26 | 2003-01-02 | N.V. Bekaert S.A. | Process and device for decreasing the amount of NOx in a diesel exhaust system |
WO2004025096A1 (en) * | 2002-09-13 | 2004-03-25 | Johnson Matthey Public Limited Company | Process for treating compression ignition engine exhaust gas |
RU2286201C2 (en) * | 2004-01-20 | 2006-10-27 | Закрытое акционерное общество "ЭКАТ" | Method of purification of the gas outbursts and the device for its realization |
CN101091916A (en) * | 2006-06-22 | 2007-12-26 | 福特环球技术公司 | Catalyst composition for diesel particulate filter |
CN101036884A (en) * | 2007-04-19 | 2007-09-19 | 德清县三龙催化剂有限公司 | Titanium radicle catalyzer for thermal power plant smock air SCR denitration |
-
2009
- 2009-04-08 EP EP09005153.3A patent/EP2112341B1/en active Active
- 2009-04-10 US US12/421,947 patent/US20090260346A1/en not_active Abandoned
- 2009-04-21 RU RU2009114864/05A patent/RU2517714C2/en active
- 2009-04-22 CN CN2009102039876A patent/CN101564646B/en active Active
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3903020A (en) * | 1972-07-14 | 1975-09-02 | Grace W R & Co | Stabilized automotive exhaust gas catalyst |
US5081095A (en) * | 1990-09-10 | 1992-01-14 | General Motors Corporation | Method of making a support containing an alumina-ceria washcoat for a noble metal catalyst |
US6255249B1 (en) * | 1991-11-26 | 2001-07-03 | Engelhard Corporation | Oxidation catalyst and method of use |
US5431893A (en) * | 1992-02-24 | 1995-07-11 | Hug; Hans T. | Cleaning exhaust gases from combustion installations |
US6823660B2 (en) * | 2001-12-13 | 2004-11-30 | Isuzu Motors Limited | Exhaust emission purification system for diesel engine |
US6892529B2 (en) * | 2002-02-25 | 2005-05-17 | Daimlerchrysler Ag | Exhaust-gas purification system for an internal combustion engine |
US20030167756A1 (en) * | 2002-03-07 | 2003-09-11 | Szymkowicz Patrick G. | After-treatment system and method for reducing emissions in diesel engine exhaust |
US20060107649A1 (en) * | 2002-08-26 | 2006-05-25 | Masayuki Kamikawa | Apparatus and method for clarifying exhaust gas of diesel engine |
US20070089403A1 (en) * | 2003-02-26 | 2007-04-26 | Umicore Ag & Co. Kg | Exhaust-gas purification system for the selective catalytic reduction of nitrogen oxides in the lean exhaust gas of internal combustion engines and method of exhaust-gas purification |
US20070160508A1 (en) * | 2005-12-09 | 2007-07-12 | Mitsubishi Fuso Truck And Bus Corporation | Exhaust gas purification device |
US20090205322A1 (en) * | 2006-03-03 | 2009-08-20 | Daimler Ag | Exhaust Gas Aftertreatment System and Exhaust Gas Cleaning Method |
US20070277507A1 (en) * | 2006-06-06 | 2007-12-06 | Eaton Corporation | Enhanced hybrid de-NOx system |
US20070289289A1 (en) * | 2006-06-16 | 2007-12-20 | Denso Corporation | Exhaust emission purifier with additive feeder unit and pressurized air introducer unit |
US20080066451A1 (en) * | 2006-09-18 | 2008-03-20 | Jay Warner | Exhaust treatment packaging apparatus, system, and method |
US20080127638A1 (en) * | 2006-12-01 | 2008-06-05 | Marius Vaarkamp | Emission Treatment Systems and Methods |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9737878B2 (en) | 2007-10-15 | 2017-08-22 | SDCmaterials, Inc. | Method and system for forming plug and play metal catalysts |
US8505280B2 (en) * | 2007-10-23 | 2013-08-13 | Peugeot Citroen Automobiles Sa | Process for controlling the injection of urea in a selective catalytic reduction system |
US20100300076A1 (en) * | 2007-10-23 | 2010-12-02 | Pierre Henri Maesse | Process For Controlling The Injection Of Urea In A Selective Catalytic Reduction System |
US8997465B2 (en) * | 2009-02-20 | 2015-04-07 | Haldor Topsoe A/S | Method for purification of exhaust gas from a diesel engine |
US20110283680A1 (en) * | 2009-02-20 | 2011-11-24 | Ioannis Gekas | Method for purification of exhaust gas from a diesel engine |
WO2011100809A1 (en) | 2010-02-19 | 2011-08-25 | Vladko Todorov Panayotov | Method for removing harmful emission from exhaust gases |
US20110239624A1 (en) * | 2010-04-06 | 2011-10-06 | Gm Global Technology Operations, Inc. | Apparatus and method for regenerating an exhaust filter |
US8763369B2 (en) * | 2010-04-06 | 2014-07-01 | GM Global Technology Operations LLC | Apparatus and method for regenerating an exhaust filter |
US8987161B2 (en) | 2010-08-13 | 2015-03-24 | Ut-Battelle, Llc | Zeolite-based SCR catalysts and their use in diesel engine emission treatment |
US9403156B2 (en) | 2010-08-13 | 2016-08-02 | Ut-Battelle, Llc | Zeolite-based SCR catalysts and their use in diesel engine emission treatment |
CN102000507A (en) * | 2010-11-05 | 2011-04-06 | 中国石油大学(北京) | Reducing gas injection and quadruple-effect catalysis purification system for diesel vehicle tail gas treatment |
WO2013104633A1 (en) | 2012-01-09 | 2013-07-18 | Eminox Limited | Exhaust system and method for reducing particulate and no2 emissions |
US9616384B2 (en) | 2014-06-11 | 2017-04-11 | Basf Se | Base metal catalyst |
GB2552072A (en) * | 2016-05-31 | 2018-01-10 | Johnson Matthey Plc | Vanadium catalysts for high engine-out NO2 systems |
US11149617B2 (en) * | 2016-08-19 | 2021-10-19 | Kohler Co. | System and method for low CO emission engine |
US11643962B2 (en) | 2016-08-19 | 2023-05-09 | Kohler Co. | System and method for low CO emission engine |
US11280240B2 (en) | 2018-03-29 | 2022-03-22 | Johnson Matthey Public Limited Company | Exhaust system including SCRF catalyst with oxidation zone |
WO2019186485A1 (en) * | 2018-03-29 | 2019-10-03 | Johnson Matthey Public Limited Company | Exhaust system including scrf catalyst with oxidation zone |
US11541379B2 (en) * | 2018-08-31 | 2023-01-03 | Johnson Matthey Public Limited Company | Bimetallic Cu/Mn catalysts for selective catalytic reduction |
WO2020221682A1 (en) * | 2019-04-29 | 2020-11-05 | Basf Corporation | Exhaust gas treatment system for ultra low nox and cold start |
US20220203336A1 (en) * | 2019-04-29 | 2022-06-30 | Basf Corporation | Exhaust gas treatment system for ultra low nox and cold start |
US11779906B2 (en) * | 2019-04-29 | 2023-10-10 | Basf Corporation | Exhaust gas treatment system for ultra low NOx and cold start |
US11338272B2 (en) * | 2019-10-18 | 2022-05-24 | Daeyoung C&E | Catalyst capable of directly decomposing urea and method for urea decomposition using the same |
CN114592958A (en) * | 2021-02-09 | 2022-06-07 | 长城汽车股份有限公司 | Fuel engine tail gas aftertreatment system and method |
Also Published As
Publication number | Publication date |
---|---|
EP2112341A2 (en) | 2009-10-28 |
EP2112341A3 (en) | 2010-02-17 |
RU2517714C2 (en) | 2014-05-27 |
CN101564646A (en) | 2009-10-28 |
RU2009114864A (en) | 2010-10-27 |
EP2112341B1 (en) | 2018-07-11 |
CN101564646B (en) | 2012-11-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2112341B1 (en) | Method for purification of an exhaust gas from a diesel engine | |
KR101699923B1 (en) | Method for purification of exhaust gas from a diesel engine | |
KR101875228B1 (en) | Apparatus and controlling method of urea-scr system | |
US8904760B2 (en) | Exhaust gas treatment system including an HC-SCR and two-way catalyst and method of using the same | |
US8506892B2 (en) | Exhaust gas purifying device for diesel engine | |
JP6423624B2 (en) | Method for reducing nitrogen oxides in diesel engine exhaust gas and exhaust gas aftertreatment system for carrying out the method | |
US20110120093A1 (en) | Process and apparatus for purifying exhaust gases from an internal combustion engine | |
CN102454453B (en) | There is the SO of reduction 3the discharge SCR NO of the durability produced and improve xafter-treatment system | |
JP6396636B2 (en) | Improved exhaust gas control | |
KR20100106477A (en) | Denox of diesel engine exhaust gases using a temperature-controlled precatalyst for providing no2 in accordance with the requirements | |
US20100300078A1 (en) | Exhaust After Treatment System | |
CN107636271B (en) | Method, multifunctional filter and system for removing particulate matter and harmful compounds from engine exhaust | |
WO2016001034A1 (en) | An exhaust aftertreatment system for a diesel engine | |
KR20140062899A (en) | Exhaust gas purification system of vehicle | |
JP4582806B2 (en) | Exhaust gas purification device | |
JP2004138022A (en) | Method of and device for treating diesel exhaust gas | |
KR101091633B1 (en) | Denitrification catalyst and exhaust system using the same | |
JPH05171921A (en) | Exhaust gas purifying device | |
US9708949B2 (en) | Exhaust aftertreatment system for a compression-ignition engine | |
WO2008143432A1 (en) | Purifying device for exhaust gas of internal combustion engine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HALDOR TOPSOE A/S, DENMARK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GEKAS, IOANNIS;JOHANSEN, KELD;REEL/FRAME:022534/0235 Effective date: 20090402 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |