GB2547325A - Filter - Google Patents
Filter Download PDFInfo
- Publication number
- GB2547325A GB2547325A GB1700232.0A GB201700232A GB2547325A GB 2547325 A GB2547325 A GB 2547325A GB 201700232 A GB201700232 A GB 201700232A GB 2547325 A GB2547325 A GB 2547325A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- end portion
- catalytic substance
- side end
- partition walls
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 claims abstract description 56
- 230000003197 catalytic effect Effects 0.000 claims abstract description 47
- 239000000126 substance Substances 0.000 claims abstract description 46
- 239000002585 base Substances 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 38
- 239000011148 porous material Substances 0.000 claims abstract description 37
- 238000005192 partition Methods 0.000 claims abstract description 36
- 239000011800 void material Substances 0.000 claims abstract description 16
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 10
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 239000011232 storage material Substances 0.000 claims abstract description 9
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 7
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 18
- 229910000510 noble metal Inorganic materials 0.000 claims description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract description 19
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 19
- 239000003054 catalyst Substances 0.000 description 26
- 210000004027 cell Anatomy 0.000 description 24
- 238000002485 combustion reaction Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 229910052792 caesium Inorganic materials 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 150000003624 transition metals Chemical group 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 210000001175 cerebrospinal fluid Anatomy 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001124569 Lycaenidae Species 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910003930 SiCb Inorganic materials 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 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 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000002459 porosimetry Methods 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
- B01J21/04—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
-
- B01J35/30—
-
- B01J35/40—
-
- B01J35/56—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0248—Coatings comprising impregnated particles
-
- 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
- F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/202—Alkali metals
- B01D2255/2022—Potassium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/204—Alkaline earth metals
- B01D2255/2047—Magnesium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
- B01D2255/2065—Cerium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/209—Other metals
- B01D2255/2092—Aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/209—Other metals
- B01D2255/2096—Bismuth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/40—Mixed oxides
- B01D2255/402—Perovskites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/908—O2-storage component incorporated in the catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/915—Catalyst supported on particulate filters
- B01D2255/9155—Wall flow filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/92—Dimensions
- B01D2255/9205—Porosity
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- 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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- 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
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
Abstract
A filter 1 used in an exhaust system for an engine comprises a base material having a plurality of cells 4 forming gas flow paths and having a gas inflow-side end portion 2 and outflow-side end portion 3, and a plurality of porous partition walls 5 defining the cells, the end portions of at least some of the cells being closed off (i.e. wall-flow filter). The void occupancy of a catalytic substance within pores of the partition walls (the percentage of the pore area or volume of the base material that is filled by catalytic material) is 10% or less, preferably less than 5%. The catalytic substance may comprise platinum and palladium in a ratio between 1:1 and 10:1. The filter may include an oxygen storage material, alkali metal or perovskite material. The catalytic substance may be included in a range between 10% and 50% of the total length of the partition walls in a lengthwise direction from the gas inflow-side end portion.
Description
SPECIFICATION
Title of the Invention: Filter Technical Field [0001]
The present invention relates to a filter.
Prior Art [0002] A filter of the type in which end portions of cells forming gas flow paths are alternately closed off and gas passes through partition walls in the cells has been proposed in the prior art as a filter forming part of an exhaust gas purification system (wall-flow filter). A filter of this type has a structure in which gas flowing into the filter from the engine side is made to forcibly pass through voids in the partition walls.
[0003]
Meanwhile, there are also filters of the type in which the end portions of the cells are not completely closed off alternately and by necessity the total amount of gas does not pass through the partition walls. A filter of this type has a relatively low trapping efficiency in respect of PM (particulate matter including graphite etc.) in comparison with the abovementioned wall-flow filter, but because it has a structure that is unlikely to become completely clogged, there is an advantage in that forced regeneration control is unnecessary as a matter of course.
Summary of the Invention [0004]
The inventors of the present invention found that there is a reduction in the amount of PM which can be trapped inside the cell in the case of an on-wall catalyst coating method in which the surfaces of partition walls of filter cells are charged with a catalytic substance in a wall-flow type filter in which the end portions of the cell are alternately closed off, so there is a problem in terms of a reduced PM trapping efficiency.
Meanwhile, it was found that the porosity of the partition walls decreases if there is an excessive amount of coating in the case of an in-wall type filter when the catalytic substance is simply coated on the inside of the porous partition walls, so there is a reduction in PM trapping efficiency and furthermore, there is also a reduction in PM oxidation efficiency afforded by the catalyst.
[0005]
The present invention has been devised against this background, and the aim thereof lies in providing a filter which does not suffer any loss in terms of performance relating to PM trapping efficiency, and which can also maintain high treatment efficiency afforded by the catalyst.
[0006]
The present invention provides a filter comprising a base material and a catalytic substance provided within the base material, wherein the base material comprises a plurality of cells forming gas flow paths and having a gas inflow-side end portion and outflow-side end portion, and a plurality of porous partition walls defining said cells, the end portions of at least some of the cells being closed off, and the void occupancy of the catalytic substance within the pores of the partition walls is 10% or less.
[0007]
According to a mode of the present invention, the abovementioned filter is such that the catalytic substance has a mean particle size D50 of 1/10 or less of the mean pore size D50 of the pores in the partition walls .
[0008]
According to a mode of the present invention, the abovementioned filter is such that the concentration ratio of noble metals contained in the catalytic substance at the gas inflow-side end portion and outflow-side end portion is between 10/90 and 90/10.
[0009]
According to a mode of the present invention, the abovementioned filter is such that the catalytic substance is included in a range of between 10% and 50% of the total length of the partition walls in the lengthwise direction, from the gas inflow-side end portion.
[0010]
According to a mode of the present invention, when Pt and Pd are used as the catalytic substance, the abovementioned filter comprises said materials in a ratio of between 1:1 and 10:1.
[0011]
According to a mode of the present invention, the abovementioned filter includes at least one material selected from the group consisting of oxygen storage materials, alkali metals and perovskite materials.
[0012]
According to a mode of the present invention, the abovementioned filter is such that only one of the gas inflow-side end portion and outflow-side end portion is partially closed off.
[0013]
According to a mode of the present invention, the abovementioned filter is such that the porosity of the base material is between 40% and 70%.
[0014]
According to a mode of the present invention, the abovementioned filter is such that the void occupancy of the catalytic substance is less than 5%.
[0015]
The present invention makes it possible to provide a filter which does not suffer any loss in terms of performance relating to PM trapping efficiency, and which can also maintain high treatment efficiency afforded by the catalyst.
Brief Description of the Drawings [0016] [Fig. 1] is a schematic diagram to illustrate the filter according to a mode of embodiment; [Fig. 2] is an image of the filter as observed under an electron microscope; [Fig. 3] is a graph showing the correlation of void occupancy obtained from an SEM image and void occupancy obtained from measurement results using a mercury porosimeter; [Fig. 4] is a graph showing the relationship of catalyst particle size and pressure loss; [Fig. 5] is a graph showing the relationship of PM trapping efficiency and pore filling ratio in a CSF; [Fig. 6] is a graph showing the relationship of pressure loss increase rate and pore filling ratio in a CSF; and [Fig. 7] is a graph showing the relationship of Pt/Pd ratio and combustion temperature.
Mode of Embodiment of the Invention [0017] A mode of embodiment of the present invention will be described below with the aid of the drawings but the present invention is obviously not limited by this mode of embodiment.
[0018] [Filter]
The filter according to this mode of embodiment comprises a base material 1 and a catalytic substance provided within the base material 1, said filter being characterized in that the base material 1 comprises a plurality of cells 4 forming gas flow paths and having a gas inflow-side end portion 2 and outflow-side end portion 3, and a plurality of porous partition walls 5 defining said cells 4, the end portions of at least some of the cells 4 being closed off, and the void occupancy of the catalytic substance (not depicted) within the pores (not depicted) of the partition walls is 10% or less .
[0019]
The filter according to this mode of embodiment does not suffer any loss in terms of performance relating to PM trapping efficiency, and can also maintain high treatment efficiency afforded by the catalyst.
[0020]
As illustrated in fig. 1, the filter according to this mode of embodiment comprises the base material 1 and the catalytic substance provided within the base material. The base material 1 supports the catalytic substance and is preferably durable, without reducing the combustion efficiency of a connected engine.
[0021]
There is no particular limitation as to the material forming the base material 1, provided that pores are provided at least in the partition walls 5, but when the filter is utilized as an exhaust gas purification filter, for example, a porous ceramic material is preferably used.
[0022]
Preferred materials for the base material 1 include: cordierite ceramics comprising three components, namely aluminum oxide (AI2O3: alumina), silicon dioxide (SiCb: silica) and magnesium oxide (MgO); silicon carbide and aluminum titanate. By using these materials with an organic pore-forming material, it is possible to set the porosity of the partition walls 5 etc. in the base material 1 in a preferred range.
[0023] A honeycomb-shape comprising these materials is preferred as the base material 1. A honeycomb filter comprises a plurality of cells forming gas flow paths, but there is no particular limitation as to the cross-sectional shape of the cells and a "chessboard" grid such as that illustrated in fig. 1 may be used or hexagonal shapes may be used, for example, and there are no particular constraints on the shape thereof. Alternatively, it is egually possible to use what is known as an asymmetric cell structure having different cell sizes at the inlet and the outlet.
[0024]
There is no limitation as to the structure of the base material 1 in the filter according to this mode of embodiment, but the base material 1 comprises at least the gas inflow-side end portion 2 and outflow-side end portion 3. Furthermore, the base material 1 comprises at least the plurality of cells 4 that form the gas flow paths and the plurality of porous partition walls 5 that define said cells 4.
[0025]
In the filter according to this mode of embodiment, the plurality of cells 4 are such that the end portions of at least some of said cells 4 are closed off. By virtue of this kind of structure, gas flowing in from the inflow-side end portion 2 flows out from the outflow-side end portion 3, with some of the gas moving inside the cells 4 without passing through the partition walls, and some of the gas passing through the pores in the partition walls 5.
[0026]
There is no limitation as to the proportion of closed-off cells, nor is there any limitation as the arrangement of the closed-off cells. The filter according to this mode of embodiment more preferably employs a base material having a configuration such as that described above, but there is no limitation as to the configuration of the base material supporting the catalytic substance.
[0027]
The catalytic substance is supported and held on the surface of the base material 1, said catalytic substance comprising an active metal, an active metal support and a catalyst auxiliary etc.
[0028]
The active metal serves as a catalyst active component in an oxidation catalyst. Active metals include noble metals and base metals, with noble metals being preferred. Specific examples of noble metals include platinum (Pt) , palladium (Pd), rhodium (Rh), ruthenium (Ru), iridium (Ir), osmium (Os), gold (Au) and silver (Ag), with platinum, palladium or gold more preferably being used.
Furthermore, one of these noble metals may be used or a mixture of two or more may be used, and according to a preferred mode of the invention of this application, a mixture of platinum and palladium or a mixture of platinum, palladium and gold is more preferred.
[0029]
Specific examples of base metals which may be mentioned include copper (Cu), iron (Fe), cobalt (Co), zinc (Zn), potassium (K), cesium (Cs), silver (Ag), so-called oxygen storage materials comprising a rare-earth metal and perovskite compounds comprising Fe, Μη, Y, Ce and La etc. Among these, alkali metals, oxygen storage materials and iron are more preferred. Furthermore, one of these base metals may be used or a mixture of two or more may be used.
[0030]
In the filter according to this mode of embodiment, the void occupancy of the catalytic substance occupying the pores in the plurality of porous partition walls is preferably 10% or less. By virtue of this configuration, it is possible to achieve a balance between reducing pressure loss and carbon material trapping efficiency. More preferably, 5% or less of the catalytic substance is present within the pores of the partition walls.
[0031]
As a result of the catalytic substance being present within the pores of the partition walls 5 at a void occupancy of 10% or less, it is possible to restrict resistance to the passage of gas flowing inside the cells 4 while it is also possible to achieve a balance with maintaining the trapping capacity of the PM component.
[0032]
The form of the pores and the void occupancy of the catalytic substance may be obtained using a scanning electron microscope (SEM)/electron probe micro-analyzer (ΕΡΜΑ) . For example, by means of SEM/EPMA, it is possible to obtain the pore area (A) of the base material before application of the catalytic substance in a field of view of between 150 times and 500 times by means of image processing (illustrated in fig. 2). Furthermore, the pore area (B) after application of the catalyst can also be obtained by the same method. Furthermore, the area of the base material portion is obtained by means of image processing using the same two-dimensional method, whereby the relative proportion of the pore area of the base material 1 and the area occupancy can be calculated.
[0033]
Furthermore, a mercury intrusion method is generally used as a method for three-dimensional pore structure volume measurement, and the correlation between that method and the abovementioned image method affords results such as illustrated in fig. 3; there is a correlation between the two-dimensional void occupancy (proportion of occupied area) obtained from an SEM image, and the void occupancy volume obtained from mercury porosimeter measurement results constituting three-dimensional information.
[0034]
Here, according to the SEM image method, an EPM method with a magnification of 150-200 times is preferably used, e.g., it is possible to obtain the occupied area by separating the base material and the area occupied by the catalyst according to color using an RGB method.
In the filter according to this mode of embodiment, when the occupied area is obtained by image processing, the image is binarized and the calculation is made using an automatic mode or the like in order to prevent human error .
[0035]
In the filter according to this mode of embodiment, the mean particle size D50 of the catalytic substance is preferably 1/10 or less of the mean pore size D50 of the pores in the partition walls 5.
[0036]
The mean particle size D50 of the catalytic substance may be specifically measured by laser diffraction or the like. The mean pore size D50 of the partition walls 5 may be measured specifically by mercury porosimetry. For example, if the mean pore size D50 of the pores in the partition walls 5 is 10 pm, then the mean particle size D50 of the catalytic substance is preferably 0.5 pm or less .
[0037]
Here, the "mean particle size D50" means the size of particles (median size) corresponding to a median value (50%) in the grain size distribution of the particles.
[0038]
The mean pore size D50 of the pores in the partition walls 5 is preferably between 8 pm and 20 pm, and 10 pm or greater is more preferable from the point of view that there is a high initial level of trapping efficiency with respect to carbon materials. The mean particle size D50 of the catalytic substance is preferably 1/10 or less of the mean pore size of the partition walls, but a mean particle size of 20 nm or greater is preferred for reasons of stability etc. of the dispersed state of solid material in a catalyst slurry.
[0039]
Furthermore, if particles larger than this are used, it tends to be difficult for the catalytic substance to reach the pores in the walls, and if the catalytic substance is deposited on the walls on the catalyst slurry supply-side in particular (on-wall), this is likely to cause a reduction in PM trapping efficiency and trapping capacity.
[0040]
In the filter according to this mode of embodiment, the amount of catalytic substance may have a gradient in the lengthwise direction of the base material, and the void occupancy of the catalyst is preferably 10% or less. By virtue of this configuration, it is possible to increase the efficiency contributed by the catalyst in terms of exhaust gas purification.
[0041]
The amount of catalytic substance, expressed another way, means the concentration of active metal such as Pt or Pd acting as a catalyst. That is to say, the concentration of active metal may have a gradient in the lengthwise direction of the base material and the concentration ratio of active metal at the gas inflow-side end portion and outflow-side end portion may be between 10/90 and 90/10.
[0042]
If the inflow side is at a high concentration, this makes it possible for the noble metal on the filter to contribute to exhaust gas purification, while it is effective for the outflow side to be at a high concentration if NO2 or the like is to be supplied downstream, for example.
[0043]
If the filter according to this mode of embodiment has the base material configuration described above, it is possible to restrict a reduction in PM trapping efficiency and efficiency of the treatment afforded by the catalyst in a state in which the catalyst is locally present at the inflow-side end portion 2 and the outflow-side end portion 3.
[0044]
In the filter according to this mode of embodiment, the catalytic substance is preferably included in a range of between 10% and 50% of the total length of the partition walls in the lengthwise direction, from the gas inflow-side end portion.
By setting the range of application of the catalytic substance at between 10% and 50% of the total length of the partition walls in the lengthwise direction, it is possible to achieve an effect of enabling particularly high NOx purification performance to be achieved. In this case, the range of application of the catalytic substance is preferably started from the gas inflow-side end portion, but the catalytic substance is preferably not provided at the gas outflow side.
[0045]
In the filter according to this mode of embodiment, Pt and Pd are preferably included in a ratio of between 1:1 and 10:1 as the catalytic substance. By virtue of this configuration, it is possible to achieve an effect enabling suppression of thermal sintering (aggregation) of the noble metal. Pt and Pd are more preferably included in a ratio of between 2:1 and 5:1.
[0046]
Furthermore, even if only a PM combustion catalyst comprising a transition metal group is used in conjunction with a noble metal, only the PM combustion catalyst comprising a transition metal group may be applied, or the two may be mixed for use.
[0047]
In the filter according to this mode of embodiment, at least one material selected from the group consisting of oxygen storage materials, alkali metals and perovskite materials is preferably further included as a catalyst auxiliary. By further including this kind of PM combustion catalyst comprising a transition metal group, it is possible to achieve an effect of promoting combustion of carbon materials.
[0048]
Examples of oxygen storage materials which may be cited include materials comprising Ce, Pr, Zr and Nd. Among these, Ce is particularly preferably used for reasons of promoting combustion.
[0049]
Examples of alkali metals which may be cited include K, Cs and Mg. Among these, K and Cs are particularly preferably used for reasons of promoting combustion.
[0050]
Examples of perovskite materials which may be cited include Βΐ4Τί3θ4 (JP 2010-69471 A) and Ceo.5Bi0.iPr0.4 JP 2009-112907 A), among others.
[0051]
The oxygen storage materials are most preferred among the oxygen storage materials, alkali metals and perovskite materials .
[0052]
In the filter according to this mode of embodiment, only one of the gas inflow-side end portion and outflow-side end portion is preferably partially closed off. By virtue of this configuration, it is possible to achieve an effect of making the filter less likely to become clogged in actual use.
[0053]
In the filter according to this mode of embodiment, the porosity of the base material 1 is preferably between 40% and 70%. By virtue of this configuration, it is possible to achieve an effect of a balance between reduced pressure loss and carbon material trapping capacity.
The porosity of the base material 1 is more preferably between 45% and 65% from the point of view of a balance between pressure loss and PM trapping performance.
[0054]
In the filter according to this mode of embodiment, the void occupancy of the catalytic substance in the pores of the partition walls 5 in accordance with image processing is preferably less than 10%. By virtue of this configuration, it is possible to achieve an effect whereby it is possible to restrict a reduction in PM trapping efficiency and increased pressure loss.
The void occupancy of the catalytic substance in the pores of the partition walls 5 is more preferably less than 5%.
[0055]
The filter according to this mode of embodiment is used for exhaust gas purification, and a device employing the filter according to this mode of embodiment is preferably used in an exhaust system of an internal combustion engine, in particular a spark-ignition engine (e.g. a gasoline engine) or a compression-ignition engine (e.g. a diesel engine).
[0056]
Furthermore, these engines may be engines which combust fuel while adjusting the air/fuel ratio, and specific preferred examples thereof which may be cited include lean-burn engines and direct-injection engines, and preferably engines combining same (i.e., direct-injection lean-burn engines). A direct-injection engine employs a fuel supply system which enables an increased compression ratio, an improvement in fuel efficiency and also a reduction in exhaust gas. It is therefore possible to envision a reduction in exhaust gas and an improvement in combustion efficiency by combining a direct-injection engine with a lean-burn engine.
[0057]
The filter according to this mode of embodiment is preferably used in an exhaust system of an internal combustion engine mounted in a transportation vehicle or machine etc. Specific examples of transportation vehicles and machines which may be cited include: transportation vehicles such as automobiles, buses, trucks, dump trucks, tracked vehicles, motorcycles, moving vehicles equipped with an engine, watercraft, tankers, motorboats, and aircraft; agricultural machines such as cultivators, tractors, combine harvesters, chainsaws, and forestry machines; marine fishery machines such as fishing boats; civil engineering machines such as tanker trucks, cranes, compressors, and excavators; power generators; and similar machines.
[0058]
When the filter according to this mode of embodiment is installed in a vehicle exhaust system, for example, it may be provided in a start catalyst, an underfloor system or a manifold converter.
[Exemplary Embodiments] [0059]
Exemplary embodiments in accordance with the present invention will be described below. The content of the present invention should not be construed as being limited by these exemplary embodiments.
[0060] <Exemplary Embodiment 1> A slurry comprising alumina particles having a mean particle size (D50) of 0.02 pm, 0.5 pm, 2.1 pm or 4.5 pm was coated in an amount of 11 g/L on a diesel particulate filter (DPF) base material (diameter 143.8 mm, length 152.4 mm, after which the materials were dried and baked at 500°C to produce a catalyzed DPF. The pressure loss (BP) under an air stream of 300 kg/h was measured for said catalyzed DPF.
[0061]
Fig. 4 is a graph showing the relationship of catalyst particle size (D50) and pressure loss (BP) with respect to a DPF having a mean pore size of 10 pm for the base material. It is clear from this graph that when the mean pore size of the DPF is 10 pm, the mean particle size is preferably approximately 0.5 pm or less.
[0062] <Exemplary Embodiment 2>
Three types of catalyzed soot filters (CSF) in which the amount of catalyst was 11 g/L, 25 g/L and 45 g/L were prepared using alumina particles having a mean particle size of 0.02 pm.
The filling ratio of the pores of the CSFs were obtained by means of an image processing method, and the PM trapping efficiency was measured using a PM generator. The results are shown in fig. 5. It is clear from the results in fig. 5 that the PM trapping efficiency decreases as the pore filling ratio increases.
[0063] <Exemplary Embodiment 3>
Pressure loss measurements were carried out using the CSFs prepared in Exemplary Embodiment 2. The results are shown in fig. 6. It is clear from results in fig. 6 that the pressure loss increases as the as the pore filling ratio increases. The catalyst is therefore preferably present from the point of view of PM combustion, but it is clear that the filling ratio of the filter base material is preferably lower, based on the results of Exemplary Embodiments 2 and 3.
[0064] <Exemplary Embodiment 4>
Fig. 7 is a graph showing the relationship of Pt/Pd ratio and combustion temperature. The graph in fig. 7 shows cases of Pt/Pd = 1/0, 3/1, 2/1 and 1/1. It is clear from the results in fig. 7 that the Pd ratio is preferably higher in order to cause the PFF to contribute to emission reduction, and it is clear that the proportion of Pt is preferably higher in order to cause the PFF to contribute to PM combustion.
Claims (9)
1. A filter comprising a base material and a catalytic substance provided within the base material, wherein the base material comprises a plurality of cells forming gas flow paths and having a gas inflow-side end portion and outflow-side end portion, and a plurality of porous partition walls defining said cells, the end portions of at least some of the cells being closed off, and the void occupancy of the catalytic substance within the pores of the partition walls is 10% or less.
2. The filter as claimed in claim 1, wherein the catalytic substance has a mean particle size D50 of 1/10 or less of the mean pore size D50 of the pores in the partition walls.
3. The filter as claimed in claim 1 or 2, wherein the concentration ratio of noble metals contained in the catalytic substance at the gas inflow-side end portion and outflow-side end portion is between 10/90 and 90/10.
4. The filter as claimed in any one of claims 1 to 3, wherein the catalytic substance is included in a range of between 10% and 50% of the total length of the partition walls in the lengthwise direction, from the gas inflow-side end portion.
5. The filter as claimed in any one of claims 1 to 4, comprising Pt and Pd in a ratio of between 1:1 and 10:1 as the catalytic substance.
6. The filter as claimed in any one of claims 1 to 5, further including at least one material selected from the group consisting of oxygen storage materials, alkali metals and perovskite materials.
7. The filter as claimed in any one of claims 1 to 6, wherein only one of the gas inflow-side end portion and outflow-side end portion is partially closed off.
8. The filter as claimed in any one of claims 1 to 7, wherein the porosity of the base material is between 40% and 70%.
9. The filter as claimed in any one of claims 1 to 8, wherein the void occupancy of the catalytic substance is less than 5%.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016050353 | 2016-01-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB201700232D0 GB201700232D0 (en) | 2017-02-22 |
GB2547325A true GB2547325A (en) | 2017-08-16 |
GB2547325B GB2547325B (en) | 2020-03-04 |
Family
ID=58463720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1700232.0A Expired - Fee Related GB2547325B (en) | 2016-01-07 | 2017-01-06 | Particulate filter with catalytic substance |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2547325B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108614920A (en) * | 2018-04-03 | 2018-10-02 | 同济大学 | A kind of multiple devices local exhaust simultaneity factor determines method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014094360A (en) * | 2012-11-12 | 2014-05-22 | Cataler Corp | Exhaust gas cleaning filter and method for producing exhaust gas cleaning filter |
EP3162428A1 (en) * | 2015-10-30 | 2017-05-03 | Cataler Corporation | Exhaust gas purification device |
-
2017
- 2017-01-06 GB GB1700232.0A patent/GB2547325B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014094360A (en) * | 2012-11-12 | 2014-05-22 | Cataler Corp | Exhaust gas cleaning filter and method for producing exhaust gas cleaning filter |
EP3162428A1 (en) * | 2015-10-30 | 2017-05-03 | Cataler Corporation | Exhaust gas purification device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108614920A (en) * | 2018-04-03 | 2018-10-02 | 同济大学 | A kind of multiple devices local exhaust simultaneity factor determines method |
CN108614920B (en) * | 2018-04-03 | 2021-10-12 | 同济大学 | Method for determining simultaneous coefficient of local air exhaust of multiple devices |
Also Published As
Publication number | Publication date |
---|---|
GB201700232D0 (en) | 2017-02-22 |
GB2547325B (en) | 2020-03-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6189936B2 (en) | Filter base with a three-way catalyst | |
US7625529B2 (en) | Catalyst-carrying filter | |
JP5726414B2 (en) | Catalyst-carrying filter and exhaust gas purification system | |
JP2020008022A (en) | Contaminant reduction device for gasoline automobile | |
WO2009139107A4 (en) | Exhaust gas purifying catalyst and manufacturing method of the same | |
US10233803B2 (en) | Exhaust gas purification filter | |
KR20150119140A (en) | Positive ignition engine and exhaust system comprising three-way catalysed filter | |
WO2019065206A1 (en) | Exhaust-gas purifying catalyst | |
JP2006110485A (en) | Exhaust gas catalyst and exhaust gas trteatment apparatus using the catalyst | |
KR20190039151A (en) | Monomethalidium-containing quaternary conversion catalyst for gasoline engine emissions treatment systems | |
JPWO2020039649A1 (en) | Exhaust gas purification catalyst | |
JP7023770B2 (en) | Exhaust gas purification catalyst | |
WO2020031975A1 (en) | Catalyst-coated gasoline particulate filter and method for producing same | |
WO2020100582A1 (en) | Particulate filter | |
EP3636340A1 (en) | Catalyst for exhaust gas purification | |
CN105813735A (en) | Exhaust purification catalyst | |
US10137412B2 (en) | Filter | |
JP2004330025A (en) | Exhaust gas catalyst and exhaust gas treatment apparatus using it | |
GB2547325A (en) | Filter | |
WO2011125773A1 (en) | Honeycomb filter | |
EP4147778A1 (en) | Exhaust gas purification catalyst | |
EP2614872B1 (en) | Honeycomb filter | |
KR20230079369A (en) | Catalyst articles for filtering fine particles and uses thereof | |
JP2006051475A (en) | Exhaust gas purification catalyst and method for manufacturing the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20210106 |