WO2006035823A1 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
- Publication number
- WO2006035823A1 WO2006035823A1 PCT/JP2005/017869 JP2005017869W WO2006035823A1 WO 2006035823 A1 WO2006035823 A1 WO 2006035823A1 JP 2005017869 W JP2005017869 W JP 2005017869W WO 2006035823 A1 WO2006035823 A1 WO 2006035823A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- catalyst
- porous ceramic
- cam structure
- layer
- pore
- Prior art date
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 137
- 239000003054 catalyst Substances 0.000 claims abstract description 124
- 239000011148 porous material Substances 0.000 claims abstract description 104
- 239000002245 particle Substances 0.000 claims abstract description 96
- 239000010410 layer Substances 0.000 claims abstract description 88
- 238000009826 distribution Methods 0.000 claims abstract description 33
- 239000012790 adhesive layer Substances 0.000 claims abstract description 15
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 16
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 12
- 229910052878 cordierite Inorganic materials 0.000 claims description 7
- 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 7
- 238000007789 sealing Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 abstract description 35
- 239000003566 sealing material Substances 0.000 description 38
- 210000004027 cell Anatomy 0.000 description 32
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 26
- 238000000034 method Methods 0.000 description 18
- 239000000843 powder Substances 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 14
- 239000011230 binding agent Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 239000002002 slurry Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 210000002421 cell wall Anatomy 0.000 description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000010304 firing Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 229910052574 oxide ceramic Inorganic materials 0.000 description 6
- 239000011224 oxide ceramic Substances 0.000 description 6
- 230000000737 periodic effect Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 229910052697 platinum Inorganic materials 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 5
- 239000002612 dispersion medium Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052863 mullite Inorganic materials 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000012784 inorganic fiber Substances 0.000 description 4
- 239000010954 inorganic particle Substances 0.000 description 4
- 239000007788 liquid 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
- 229910000510 noble metal Inorganic materials 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 229910052582 BN Inorganic materials 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 3
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002736 metal compounds Chemical class 0.000 description 3
- 229920000609 methyl cellulose Polymers 0.000 description 3
- 239000001923 methylcellulose Substances 0.000 description 3
- 235000010981 methylcellulose Nutrition 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 239000010948 rhodium Substances 0.000 description 3
- 229910052703 rhodium Inorganic materials 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 238000007088 Archimedes method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 229910026551 ZrC Inorganic materials 0.000 description 2
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- -1 and tandene carbide Substances 0.000 description 2
- IXSUHTFXKKBBJP-UHFFFAOYSA-L azanide;platinum(2+);dinitrite Chemical compound [NH2-].[NH2-].[Pt+2].[O-]N=O.[O-]N=O IXSUHTFXKKBBJP-UHFFFAOYSA-L 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910003468 tantalcarbide Inorganic materials 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000008393 encapsulating agent Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 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
- 238000010298 pulverizing process Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 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
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24491—Porosity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24492—Pore diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2478—Structures comprising honeycomb segments
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional 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
- 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
- F01N3/08—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
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2498—The honeycomb filter being defined by mathematical relationships
-
- 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
- F01N2330/30—Honeycomb supports characterised by their structural details
- F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
-
- 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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/28—Methods or apparatus for fitting, inserting or repairing different elements by using adhesive material, e.g. cement
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Definitions
- the present invention relates to a filter for removing particulates and the like in exhaust gas discharged from an internal combustion engine such as a diesel engine, and a honeycomb structure used as a catalyst carrier and the like.
- Patent Document 1 discloses that a large number of cells are formed by sealing one end of a large number of through holes extending in the longitudinal direction across a partition wall.
- a filter in which the pore volume is more than% and the pore diameter exceeds 50 m: 10% or less of the total pore volume is disclosed.
- Patent Document 1 describes that as an effect thereof, it is possible to prevent an increase in pressure loss due to clogging of particulates into pores with high collection efficiency.
- Patent Document 2 is an exhaust gas purification filter having a structure similar to that of Patent Document 1, in which a catalyst for acid removal of particulates is attached to partition walls,
- Patent Document 2 the particulates can penetrate into the partition walls, the catalyst reaction area can be prevented from being damaged and melted, and the collection efficiency is high. It is written.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-219319
- Patent Document 2 JP 2002-357114 A
- Patent Document 1 does not describe a force-catalyst-supporting layer that describes the relationship between porosity and pore diameter
- Patent Document 2 discloses an average pore diameter and a pore diameter. The ratio of the size of the pore diameter of 100 m or more was described, but the strength of the small pore diameter was not described.
- the inventor of the present application pays attention to the pore size distribution of the her cam structure and the particle size distribution of the particles constituting the catalyst support layer.
- the catalyst support layer is configured.
- the particles may clog the pores of the hard cam structure, and further advanced research, considering the particle size distribution of the particles constituting the catalyst support layer, and the pore size distribution of the her cam structure As a result of the adjustment, it was found that a Hercam structure capable of fulfilling the catalytic function without increasing the pressure loss was achieved, and the present invention was completed.
- a porous ceramic member formed by sealing one end of a plurality of cells penetrating in the longitudinal direction across a wall is bonded.
- the average pore size of the porous ceramic member is the pore size distribution of the porous ceramic member larger than the average particle size of the particles constituting the catalyst supporting layer and the particle size distribution of the particles constituting the catalyst supporting layer.
- the pore volume in the portion where both overlap is the total pore volume of the porous ceramic member. It is characterized by being 10% or less.
- one end of a plurality of cells penetrating in the longitudinal direction across the wall is sealed, and the catalyst supporting layer is attached to the wall.
- a porous ceramic power structure
- the average pore size of the porous ceramic is defined by the pore size distribution of the porous ceramic larger than the average particle size of the particles constituting the catalyst supporting layer and the particle size distribution of the particles constituting the catalyst supporting layer.
- the pore volume in the overlapping portion is 10% or less with respect to the total pore volume of the porous ceramic.
- the first hard-cam structure of the present invention has a silicon carbide ceramic force.
- the second hard-cam structure of the present invention is preferably made of cordierite.
- a hermetic structure having a structure in which a plurality of porous ceramic members are combined via an adhesive layer such as the hermetic structure of the first aspect of the present invention
- a combined type such as the hermetic structure of the first aspect of the present invention
- a honeycomb structure having a structure in which the whole is integrally formed such as the her cam structure of the second invention
- an integral honeycomb structure when it is not necessary to distinguish between the integral honeycomb structure and the aggregated honeycomb structure, they are simply referred to as a “her cam structure”.
- the pore size distribution of the porous ceramic and the particle size distribution of the particles constituting the catalyst supporting layer are expressed as follows.
- the pore volume in the overlapping area is adjusted so that it is 10% or less of the total pore volume of the porous ceramic.
- the her cam structure according to the first aspect of the present invention has an adhesive layer in which a porous ceramic member formed by sealing one end of a plurality of cells penetrating in the longitudinal direction across a wall portion Through A hard cam structure in which a plurality of bonded ceramic catalyst supporting layers are adhered to the wall, wherein the porous ceramic member has an average pore diameter larger than an average particle diameter of particles constituting the catalyst supporting layer.
- FIG. 1 is a perspective view schematically showing a her cam structure according to the first aspect of the present invention
- FIG. 2 (a) is a diagram showing a porous structure constituting the her cam structure shown in FIG.
- FIG. 2B is a cross-sectional view of the porous ceramic member shown in FIG.
- the her cam structure of the first aspect of the present invention is a collective her cam structure 10, and a porous ceramic member 20 having silicon carbide isotropic force is used as an adhesive layer.
- a plurality of cylinders 11 are combined to form a cylindrical ceramic block 15, and a sealing material layer (coat layer) 12 is formed around the ceramic block 15.
- the shape of the ceramic block is a columnar force.
- the ceramic block is limited to a columnar shape if it is a columnar shape.
- it may be of any shape such as an elliptical columnar shape or a prismatic shape.
- the porous ceramic member 20 includes a large number of cells 21 arranged in the longitudinal direction, and cell walls (wall portions) 23 separating the cells 21 from each other. It is functioning as a filter. That is, in the cell 21 formed in the porous ceramic member 20, as shown in FIG. 2 (b), either the inlet side or the outlet side end of the exhaust gas is sealed with the sealing material 22, The exhaust gas that has flowed into the cell 21 always passes through the cell wall 23 separating the cells 21 and then flows out of the other cells 21! /.
- the Hercam structure of the first aspect of the present invention mainly has a porous ceramic force.
- the material include nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride, and carbonization.
- carbide ceramics such as silicon, zirconium carbide, titanium carbide, tantalum carbide, and tandene carbide, and oxide ceramics such as alumina, zircoure, cordierite, mullite, and silica.
- the hard cam structure 10 is formed of a composite of silicon and silicon carbide, aluminum titanate, and two or more kinds of material forces. It may be. When using a composite of silicon and silicon carbide, it is desirable to add silicon in an amount of 0 to 45% by weight of the whole! /.
- Silicon carbide-based ceramic means silicon carbide with a content of 60 wt% or more.
- the Hercam structure 10 according to the first aspect of the present invention is a Hercam structure to which a catalyst support layer is attached, and supports the catalyst on the catalyst support layer.
- the catalyst is not particularly limited, but it can reduce the activity energy of the particulate combustion and make it easy to burn the particulate, and remove harmful gas components in the exhaust gas such as CO, HC and NOx.
- noble metals such as platinum, palladium and rhodium can be mentioned. Of these, platinum, palladium, and so-called three-way catalysts, which can also be used as a vacuum, are desirable.
- alkali metals Group 1 of the Periodic Table of Elements
- alkaline earth metals Group 2 of the Periodic Table of Elements
- rare earth elements Group 3 of the Periodic Table of Elements
- transition metal elements and the like may be supported.
- the her cam structure 10 collects particulates in the exhaust gas. In addition to functioning as a filter, it functions as a catalytic converter for purifying CO, HC, NOx, etc. contained in exhaust gas.
- the catalyst is attached to the hard cam structure 10, it is desirable that the catalyst is attached after the surface is previously coated with a catalyst support layer such as alumina. Thereby, the specific surface area can be increased, the degree of dispersion of the catalyst can be increased, and the number of reaction sites of the catalyst can be increased. Moreover, since the catalyst support layer can prevent sintering of the catalyst metal, the heat resistance of the catalyst is also improved.
- a catalyst support layer such as alumina
- Examples of the catalyst-supporting layer include oxide ceramics such as alumina, titer, zirconium, silica, and ceria.
- the average pore size of the porous ceramic member is larger than the average particle size of the particles constituting the catalyst support layer, and the pore size distribution of the porous ceramic member and the catalyst support described above.
- the particle size distribution of the particles that make up the layer is the same axis for the pore size and the particle size.
- the pore volume in the portion where both are overlapped is 10% or less with respect to the total pore volume of the porous ceramic member.
- the ratio of the pore volume in the overlapping portion to the total pore volume of the porous ceramic member is simply referred to as “the volume ratio of the overlapping portion” t.
- the porosity of the porous ceramic member 20 is not particularly limited, but the lower limit is preferably 40%, and the preferable upper limit is 75%. If it is less than 40%, the pressure loss may increase.
- the upper limit of the porosity of the porous ceramic member 20 is more preferably 65%.
- the amount of the catalyst support layer is not particularly limited, but a desirable lower limit is 20 gZl, and a desirable upper limit is 150 gZl.
- the catalyst By setting the amount of the catalyst support layer in the above range, the catalyst can be dispersed well and the increase in pressure loss can be prevented.
- the amount of the catalyst support layer is the weight (g) per liter of the apparent volume of the Hercam structure.
- a desirable lower limit of the average pore diameter of the Hercam structure 10 is 10 ⁇ m, and a desirable upper limit is 50 m.
- the average pore diameter is less than 10 m, the pressure loss after the catalyst support layer adheres becomes high.
- the average pore diameter exceeds 50 m, the particulates may pass through the pores, and the particulates are collected.
- the porosity may be measured by a conventionally known method such as a mercury intrusion method, an Archimedes method, or a measurement by a scanning electron microscope (SEM), for example. .
- the particle size of the ceramic used in the production of the Hercam structure 10 is not particularly limited, but it is desirable that the ceramics have less shrinkage in the subsequent firing step, for example, 0.3 to 50 / A combination of 100 parts by weight of powder having an average particle diameter of about ⁇ and 5 to 65 parts by weight of powder having an average particle diameter of about 0.1 to 1.0 m is desirable.
- an integrated hermetic structure made of porous ceramic can be produced.
- the porosity and the proportion of pores with a pore size of 10 m or less can be controlled to some extent.
- the sealing material 22 and the wall portion 23 constituting the porous ceramic member 20 are made of the same porous ceramic.
- the adhesive strength between the two can be increased, and the thermal expansion coefficient of the wall 23 and the thermal expansion coefficient of the sealing material 22 can be adjusted by adjusting the porosity of the sealing material 22 in the same manner as the wall 23.
- the gap between the sealing material 22 and the wall 23 due to thermal stress during manufacturing or use, or the wall of the portion that contacts the sealing material 22 or the sealing material 22 It is possible to prevent the portion 23 from being cracked.
- the wall portion means both the cell wall and the outer peripheral portion that separate the cells 21 from each other.
- the thickness of the sealing material 22 is not particularly limited.
- the sealing material 22 is made of porous silicon carbide, it is desirable that the thickness is 1 to 20 mm. Is more desirable
- the thickness of the cell wall 23 is not particularly limited, but the desirable lower limit is 0.1 mm, and the desirable upper limit is 0.6 mm. If the thickness is less than 1 mm, the strength of the her cam structure 10 may not be sufficient. If it exceeds 0.6mm, the pressure loss increases.
- the adhesive layer 11 is formed between the porous ceramic members 20, and an adhesive (or sealant) that binds the plurality of porous ceramic members 20 together.
- the sealing material layer 12 is formed on the outer peripheral surface of the her cam block 15, and when the her cam structure 10 is installed in the exhaust passage of the internal combustion engine, the her cam block 15 The outer peripheral surface force also functions as a seal material to prevent the exhaust gas passing through the cell from leaking, and as a reinforcing material to improve the strength while adjusting the outer peripheral shape of the her cam block 15 Is.
- the adhesive layer 11 and the sealing material layer 12 may be made of the same material force or different materials.
- the blending ratio of the materials may be the same or different. Further, it may be dense or porous.
- the material constituting the adhesive layer 11 and the sealing material layer 12 is not particularly limited, and examples thereof include those composed of an inorganic binder, an organic binder, inorganic fibers and / or inorganic particles.
- Examples of the inorganic binder include silica sol and alumina sol. These may be used alone or in combination of two or more. Among the inorganic binders, silica zonole is desirable.
- organic binder examples include polybulal alcohol, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, and the like. These may be used alone or in combination of two or more. Among the above organic binders, carboxylmethylcellulose is desired.
- Examples of the inorganic fiber include ceramic fibers such as silica-alumina, mullite, alumina, and silica. These may be used alone or in combination of two or more. Among the inorganic fibers, silica alumina fibers are desirable.
- Examples of the inorganic particles include carbides, nitrides, and the like. Specific examples include inorganic powders such as silicon carbide, silicon nitride, and boron nitride. These may be used alone or in combination of two or more. Among the above inorganic particles, silicon carbide having excellent thermal conductivity is desirable.
- the paste used for forming the sealing material layer and the adhesive layer may include balloons that are fine hollow spheres containing oxide ceramics as necessary, spherical acrylic particles, graphite, and the like. A pore-forming agent may be added.
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
- the honeycomb structure of the present invention in which a catalyst is supported on the catalyst support layer is a conventionally known catalyst. It functions as a gas purifier similar to the attached DPF (diesel / particulate / filter). Therefore, here, the detailed description of the case where the integral type hard cam structure of the present invention also functions as a catalyst carrier is omitted.
- extrusion molding is performed using a raw material paste mainly composed of ceramic as described above.
- the raw material paste is not particularly limited, but it is desirable to have a porosity force of 0 to 75% of the manufactured Hercum structure.
- a powder having a ceramic force as described above, The thing which added the dispersion medium liquid etc. can be mentioned.
- the particle size of the ceramic powder is not particularly limited, but it is preferable that the ceramic powder has less shrinkage in the subsequent firing step.
- a combination of 5 to 65 parts by weight of powder having an average particle size of about 1 to 1.0 m is preferred.
- the pore size and the like of the porous ceramic member In order to adjust the pore size and the like of the porous ceramic member, it is necessary to adjust the firing temperature, but the pore size can be adjusted by adjusting the particle size of the ceramic powder.
- the binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
- the amount of the binder is usually preferably about 1 to about LO parts by weight with respect to 100 parts by weight of the ceramic powder.
- the dispersion medium liquid is not particularly limited, and examples thereof include organic solvents such as benzene, alcohols such as methanol, and water.
- the dispersion medium liquid is blended in an appropriate amount so that the viscosity of the raw material paste is within a certain range.
- a molding aid may be added to the raw material paste as necessary.
- the molding aid is not particularly limited.
- ethylene glycol, dextrin examples include fatty acid sarcophagus and polyvinyl alcohol.
- a pore-forming agent such as a balloon, which is a fine hollow sphere containing an oxide-based ceramic, spherical acrylic particles, or graphite, may be added to the raw material paste as necessary.
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Of these, alumina balloons are desirable.
- the ceramic molded body is dried using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer, or the like to obtain a ceramic dried body.
- a predetermined amount of a sealing material paste as a sealing material is filled in the end of the inlet side cell group on the outlet side and the end of the outlet side cell group on the inlet side, and the cells are sealed.
- the above-mentioned sealing material paste is not particularly limited, but it is desirable that the sealing material produced through a subsequent process has a porosity of 30 to 75%. Can be used.
- the conditions for degreasing and firing the ceramic dried body the conditions conventionally used for producing a filter made of a porous ceramic can be applied.
- an adhesive paste to be the adhesive layer 11 is applied to the side surface of the porous ceramic member 20 with a uniform thickness to form the adhesive paste layer.
- the process of forming and laminating another porous ceramic member 20 on this adhesive paste layer in sequence is repeated to produce a porous ceramic member assembly having a predetermined size.
- this porous ceramic member assembly is heated to dry and solidify the adhesive paste layer to form the adhesive layer 11.
- the porous ceramic member assembly in which a plurality of porous ceramic members 20 are bonded via the adhesive layer 11 is cut to produce a cylindrical ceramic block 15.
- a catalyst support layer is formed, and it is desirable that a catalyst such as a noble metal is applied to the catalyst support layer.
- Examples thereof include a method of impregnating a ceramic fired body with a solution containing alumina powder and heating.
- a method for imparting a catalyst to the alumina membrane for example, a method in which a ceramic fired body is impregnated with a dinitrodiammine platinum nitrate solution ([Pt (NH) (NO)] HNO) or the like is heated.
- a dinitrodiammine platinum nitrate solution [Pt (NH) (NO)] HNO
- her cam structure of the first aspect of the present invention is not particularly limited, but it is desirable to use it for a vehicle exhaust gas purification device.
- FIG. 3 is a cross-sectional view schematically showing an example of an exhaust gas purifying device for a vehicle in which the her cam structure of the present invention is installed.
- the exhaust gas purification device 70 mainly includes a her cam structure 10, a casing 71 that covers the outer side of the her cam structure 10, and the her cam structure 10. Arranged between casing 71 An inlet pipe 74 connected to an internal combustion engine such as an engine is connected to the end of the casing 71 on the side where the exhaust gas is introduced. A discharge pipe 75 connected to the outside is connected to the other end.
- the arrows indicate the exhaust gas flow.
- exhaust gas discharged from an internal combustion engine such as an engine is introduced into the casing 71 through the introduction pipe 74, and the inlet side cell force After flowing into the two-cam structure and passing through the wall, particulates are collected and purified by this wall, and then the outlet cell force is also discharged out of the hard-cam structure, and the discharge pipe 75 is discharged. It will be discharged to the outside.
- a catalyst is attached to the Hercam structure, so that harmful gas components in exhaust gas such as CO, HC and NOx can be purified.
- the particulates may be burned and removed using a post-injection method, or a catalyst support layer and a catalyst layer may be formed in front of the her cam structure and the reaction heat may be used. Good.
- a heating means not shown
- the heart cam structure is heated and the particulates deposited on the walls are removed by combustion. Even so.
- the particulates can be burned and removed at a temperature lower than the normal temperature depending on the type of the catalyst.
- the her cam structure of the second aspect of the present invention is a porous structure in which one end of a plurality of cells penetrating in the longitudinal direction across a wall is sealed, and a catalyst support layer is attached to the wall.
- Fig. 4 (a) is a perspective view schematically showing a specific example of an integrated her cam structure which is another example of the her cam structure of the second invention, ) Is a cross-sectional view taken along the line B-B.
- the her cam structure 30 of the present invention has a porous ceramic in which a large number of cells 31 are arranged in parallel in the longitudinal direction with a cell wall (wall portion) 33 therebetween.
- a cylindrical ceramic block 35 is formed.
- the wall means both the cell wall separating the cell 41 and the outer peripheral part.
- the ceramic block 35 is sealed at the end portion of the cell 31 by the sealing material 32. Stopped! /
- a predetermined cell 31 is sealed with the sealing material 32 at one end, and the sealing material 32 is sealed at the other end of the ceramic block 35.
- the cells 31 that are not sealed by the sealing are sealed with the sealing material 32.
- the exhaust gas flowing into one cell 31 always passes through the cell wall 33 separating the cells 31 and then flows out from the other cells 31.
- the cell wall 33 separating the two can function as a particle collecting filter.
- a sealing material layer may be formed around the ceramic block 35 as in the case of the hard structure 10 shown in FIG.
- the porous ceramic constituting the above-mentioned Hercam structure is not particularly limited.
- oxide ceramics such as cordierite, alumina, silica, mullite, zircoa, yttria, silicon carbide, zirconium carbide
- carbide ceramics such as titanium carbide, tantalum carbide, and tungsten carbide
- nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride.
- an oxide ceramic such as cordierite is preferable. It can be manufactured at a low cost and has a relatively low coefficient of thermal expansion.
- an oxide ceramic such as cordierite is preferable. It can be manufactured at a low cost and has a relatively low coefficient of thermal expansion.
- the her cam structure of the present invention is used as the above-mentioned her cam filter, there is a low risk of being destroyed during the process. It is.
- the shape of the ceramic block 35 is a columnar force.
- the ceramic block is limited to a columnar shape if it is a columnar shape.
- an arbitrary shape such as an elliptical columnar shape or a prismatic shape may be used.
- the Hercam structure 30 of the second aspect of the present invention is a two-cam structure in which a catalyst support layer is attached and a catalyst is supported on the catalyst support layer.
- the catalyst is not particularly limited, but can reduce the combustion energy of particulates, and can purify harmful gas components in exhaust gases such as CO, HC and NOx.
- noble metals such as platinum, palladium, rhodium and the like can be mentioned. Of these, a so-called three-way catalyst composed of platinum, palladium, and rhodium is desirable.
- alkali metals Group 1 of the Periodic Table of Elements
- alkaline earth metals Group 2 of the Periodic Table of Elements
- rare earth elements Group 3 of the Periodic Table of Elements
- transition metal elements etc.
- Such a hard cam structure 30 can purify CO, HC, NOx and the like in the exhaust gas.
- the her cam structure 10 Since the catalyst is supported on the catalyst support layer of the her cam structure 30, the her cam structure 10 functions as a filter that collects particulates in the exhaust gas and is contained in the exhaust gas. It functions as a catalytic converter for purifying CO, HC and NOx.
- the catalyst is attached to the ceramic block 35, as described above, it is desirable that the catalyst is attached after the surface is previously coated with a catalyst support layer such as alumina. As a result, the specific surface area can be increased, the degree of dispersion of the catalyst can be increased, and the number of reaction sites of the catalyst can be increased. Further, since the catalyst carrier can prevent sintering of the catalyst metal, the heat resistance of the catalyst is also improved.
- Examples of the catalyst support layer include oxide ceramics such as alumina, titer, zircoure, silica, and ceria.
- the pore size distribution of the porous ceramic in which the average pore size of the porous ceramic is larger than the average particle size of the particles constituting the catalyst support layer, and the catalyst support layer is configured.
- the particle size distribution of the particles to be drawn is plotted with the same pore diameter and particle diameter.
- the pore volume in the overlapping area is 10% or less with respect to the total pore volume of the porous ceramic.
- the Hercam structure of the second aspect of the present invention by using a porous ceramic member having a particle size distribution in which the volume ratio of the overlapping portion is 10% or less, the pores of the porous ceramic member Since the pores are larger than the particles constituting the catalyst support layer, and the probability that the particles constituting the catalyst support layer block the pores is extremely small, it is possible to prevent an increase in the pressure loss of the honeycomb structure.
- the contact structure between the exhaust gas and the catalyst and the catalyst can be kept large, and a heart structure that can sufficiently function as a catalytic converter such as exhaust gas purification can be provided.
- the porosity of the ceramic block 35 is not particularly limited, but a desirable lower limit is 40% and a desirable upper limit is 75%. If it is less than 40%, the ratio of the pores to the total pore volume increases, and even if the particle size of the particles constituting the catalyst support layer is adjusted, the volume ratio of the overlapping portion is increased. It becomes difficult to make it 10% or less, which causes an increase in pressure loss.
- the upper limit of the porosity of the ceramic block 35 is more preferably 65%.
- the amount of the catalyst-supporting layer is not particularly limited, but a desirable lower limit is 20 gZl, and a desirable upper limit is 150 gZl.
- a desirable lower limit is 20 gZl
- a desirable upper limit is 150 gZl.
- the desirable lower limit of the average pore diameter of the ceramic block 35 is 10 ⁇ m, and the desirable upper limit is. If the average pore diameter is less than 1, it is difficult to attach the catalyst or the catalyst support. On the other hand, if the average pore diameter exceeds 50 m, the particulates pass through the pores and trap the particulates. Cannot be collected, and may not function as a filter.
- the porosity is, for example, a mercury intrusion method, an Archimedes method, or a scanning electron microscope. It can be measured by a conventionally known method such as measurement by (SEM).
- the ceramic block 35 is the same as that of the first invention with respect to the material of the sealing material, the thickness of the cell wall, the material of the sealing material layer, the size and type of the cell, etc., The detailed explanation is omitted.
- extrusion molding is performed using the above-mentioned raw material paste containing ceramic as a main component to produce a cylindrical ceramic molded body that becomes a ceramic block.
- the molded body is manufactured by the same method using the same binder and dispersion medium as the first present invention. Therefore, the detailed explanation is omitted here.
- the ceramic molded body is used by using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer, or the like. Dry to make a ceramic dry body.
- a predetermined amount of a sealing material paste serving as a sealing material is filled in the outlet side end portion of the inlet side cell group and the inlet side end portion of the outlet side cell group, and the cells are sealed.
- a ceramic block is manufactured by degreasing and firing, a catalyst carrier is attached to the wall, and the catalyst is supported.
- y-alumina was mixed with water and a nitric acid solution as a dispersant, and further pulverized with a ball mill at 90 min_1 to prepare an alumina slurry.
- the particle diameter of ⁇ -alumina was adjusted by changing the particle diameter of the raw material and the pulverization time, and slurry 1, slurry 2, and slurry 3 were produced.
- the prepared slurry was dried and the particle size of 100 particles was measured using a scanning electron microscope (SEM) to produce a particle size distribution.
- SEM scanning electron microscope
- the results are shown in Fig. 5.
- the average particle size of slurry 1 is 3.0 / ⁇ ⁇
- the average particle size of slurry 2 is 1.8 / ⁇ ⁇
- the average particle size of slurry 3 is 1.
- the maximum particle size of the distributed force is 13.2 m for Slurry 1, 11.3 m for Sludge 2, and 9. for Sludge 3.
- the generated shaped body was dried using a microwave dryer or the like to form a ceramic dried body, and then a sealing material paste having the same composition as that of the generated shaped body was filled in a predetermined cell.
- the porosity was 21.1%, average Carbonized with a pore size of 57.7 / zm, a size of 34.3 mm x 34.3 mm x 150 mm, the number of senor 21 is 28 / cm 2 and the thickness of virtually all walls 23 is 0.30 mm
- An integrated honeycomb structure 20 having a silicon sintered body strength was manufactured.
- alumina fiber having a fiber length of 0.2 mm, 21% by weight of silicon carbide particles having an average particle diameter of 0.6 m, 15% by weight of silica sol, 5.6% by weight of carboxymethylcellulose, and 28.4% of water
- a large number of porous ceramic members 20 were bonded using a heat-resistant adhesive paste containing wt%, and then cut using a diamond cutter, thereby producing a cylindrical ceramic block 15.
- ceramic fibers made of alumina silicate as inorganic fibers shot content: 3%, fiber length: 0.1 to: L00 mm) 23.3% by weight, inorganic particles having an average particle size of 0.3 m Silicon carbide powder 30. 2% by weight, silica sol as inorganic binder (contains SiO in sol
- a sealing material paste layer having a thickness of 0.2 mm was formed on the outer peripheral portion of the ceramic block 15 using the sealing material paste. Then, this sealing material paste layer is dried at 120 ° C to produce a cylindrical aggregate type hard structure 10 having a diameter of 143.8 mm and a length of 150 mm.
- the Hercam structure was dipped in the slurry 1 prepared by the preparation of the catalyst carrier, pulled up, and dried at 200 ° C. The above process was repeated until the alumina layer reached an amount of 120 gZL and baked at 600 ° C.
- the Mick fired body After immersing the Mick fired body, it was heated at 110 ° C. for 2 hours and at 500 ° C. in a nitrogen atmosphere for 1 hour to support 5 g ZL of a platinum catalyst having an average particle diameter of 2 nm on the surface of the ceramic fired body. The production of the supported honeycomb structure was completed.
- the Hercam structure was used except that the components shown in Table 1 were mixed to form a mixed composition and a molded product was produced by extrusion molding.
- the body 10 was manufactured, and the catalyst supporting layer and the catalyst were attached to the resulting her cam structure 10.
- the amount of the gold catalyst is constant at 5gZL.
- the porosity of the porous ceramic member 20 obtained by the above measurement, the average pore diameter, the volume of the overlapping part of the pore diameter distribution of the nozzle-cam structure used in each example and comparative example and the particle diameter distribution of the slurry The rates are shown in Table 2.
- the honeycomb structures according to the examples and comparative examples are arranged in the exhaust passage of the engine, and air is flowed at a speed of 750 m 3 Zhr to reduce the pressure loss of the her cam structure. It was measured. The results are shown in Table 2. In Table 2, the state before the catalyst support layer is attached is described as before coating, and the state after the catalyst carrier is attached is described as after coating.
- the value is in the range of 12.5 to 13. OkPa, and the value is low.
- the Hercom structure according to each comparative example in which the volume ratio of the overlapping portion exceeds 10% has a pressure loss greater than 13.0 due to the adhesion of the catalyst support layer. It turns out that it is difficult to use as a filter because the pressure loss becomes high.
- FIG. 1 is a perspective view schematically showing an example of a her cam structure of the first present invention.
- FIG. 2 (a) is a schematic view of a porous ceramic member constituting the her cam structure of the first present invention. It is the perspective view shown typically, (b) is the AA sectional view taken on the line.
- FIG. 3 is a cross-sectional view schematically showing an example of an exhaust gas purifying device for a vehicle provided with the her cam structure of the present invention.
- FIG. 4 (a) is a cross-sectional view schematically showing the second structure of the present invention, and (b) is a cross-sectional view taken along the line BB.
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Abstract
Description
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JP2006537777A JPWO2006035823A1 (ja) | 2004-09-30 | 2005-09-28 | ハニカム構造体 |
EP05787912A EP1795261A4 (en) | 2004-09-30 | 2005-09-28 | ALVEOLAR STRUCTURE |
US11/518,998 US7449427B2 (en) | 2004-09-30 | 2006-09-12 | Honeycomb structured body |
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US (1) | US7449427B2 (ja) |
EP (1) | EP1795261A4 (ja) |
JP (1) | JPWO2006035823A1 (ja) |
WO (1) | WO2006035823A1 (ja) |
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US7524350B2 (en) | 2004-10-12 | 2009-04-28 | Ibiden Co., Ltd. | Ceramic honeycomb structural body |
US7438967B2 (en) | 2005-02-04 | 2008-10-21 | Ibiden Co., Ltd. | Ceramic honeycomb structural body |
US7803312B2 (en) | 2005-02-04 | 2010-09-28 | Ibiden Co., Ltd. | Ceramic honeycomb structural body and method of manufacturing the same |
US7824629B2 (en) | 2005-08-26 | 2010-11-02 | Ibiden Co., Ltd. | Honeycomb structure and manufacturing method for honeycomb structure |
US7550026B2 (en) | 2005-09-28 | 2009-06-23 | Ibiden Co., Ltd. | Honeycomb filter |
US7883759B2 (en) | 2006-01-27 | 2011-02-08 | Ibiden Co., Ltd. | Honeycomb structure and method for manufacturing honeycomb structure |
US7732366B2 (en) | 2006-02-23 | 2010-06-08 | Ibiden Co., Ltd. | Honeycomb structure and exhaust gas purifying device |
JP2009273961A (ja) * | 2008-05-12 | 2009-11-26 | Nissan Motor Co Ltd | 排ガス浄化用触媒及びその製造方法 |
US8455391B2 (en) | 2008-05-12 | 2013-06-04 | Nissan Motor Co., Ltd. | Exhaust gas purifying catalyst and manufacturing method of the same |
JP2013000680A (ja) * | 2011-06-17 | 2013-01-07 | Ngk Insulators Ltd | 排ガス浄化フィルタ |
Also Published As
Publication number | Publication date |
---|---|
US20070065348A1 (en) | 2007-03-22 |
US7449427B2 (en) | 2008-11-11 |
JPWO2006035823A1 (ja) | 2008-05-15 |
EP1795261A4 (en) | 2009-07-08 |
EP1795261A1 (en) | 2007-06-13 |
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