WO2002076614A1 - Verfahren zum auftragen von washcoat auf einen wabenkörper - Google Patents
Verfahren zum auftragen von washcoat auf einen wabenkörper Download PDFInfo
- Publication number
- WO2002076614A1 WO2002076614A1 PCT/EP2002/002500 EP0202500W WO02076614A1 WO 2002076614 A1 WO2002076614 A1 WO 2002076614A1 EP 0202500 W EP0202500 W EP 0202500W WO 02076614 A1 WO02076614 A1 WO 02076614A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- washcoat
- honeycomb body
- dispersion
- channels
- washcoat dispersion
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000006185 dispersion Substances 0.000 claims abstract description 65
- 239000012530 fluid Substances 0.000 claims abstract description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims abstract description 4
- 239000012876 carrier material Substances 0.000 claims description 10
- 238000007654 immersion Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract 2
- 241000264877 Hippospongia communis Species 0.000 description 53
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000011888 foil Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- -1 alkaline earth metal titanate Chemical class 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 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
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 239000010457 zeolite Substances 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
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
-
- 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
- B01J37/0215—Coating
-
- 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
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/341—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
- B01J37/343—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of ultrasonic wave energy
-
- 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
-
- 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
- F01N3/2807—Metal other than sintered metal
- F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
-
- 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to a method for applying a washcoat dispersion to a honeycomb body having channels.
- Honeycomb bodies coated in this way are used in particular as catalytic converters for exhaust gas purification of an internal combustion engine.
- honeycomb bodies are crossed by many essentially parallel channels and consist, for example, of a metallic honeycomb body which is constructed from a large number of partially structured and, if appropriate, wound sheet metal foils, or of a ceramic molded body.
- a metallic honeycomb body which is constructed from a large number of partially structured and, if appropriate, wound sheet metal foils, or of a ceramic molded body.
- the ceramic material e.g. Cordierite, mollite or ⁇ -alumina can be used.
- the honeycomb bodies have very high channel densities, for example metallic honeycomb bodies with a cell density of up to 1500 cpsi (“cells per square inch”) are known.
- a further enlargement of the catalytically active surface is achieved in that the relatively smooth channel walls are coated with a so-called washcoat, which has a very jagged surface.
- this rugged surface ensures a sufficiently large amount of space for fixing a catalyst (e.g. platinum, rhodium, etc.) and, on the other hand, serves to swirl the exhaust gas flowing through, resulting in particularly intensive contact with the catalyst.
- a catalyst e.g. platinum, rhodium, etc.
- the application of the high-surface washcoat layer which requires catalysis, is carried out in such a way that the honeycomb body is immersed in or sprayed with a liquid washcoat dispersion. Then will the excess washcoat dispersion is removed, the washcoat is dried in the honeycomb body and finally calcined at temperatures usually above 450 ° C. During the calcination, the volatile constituents of the washcoat dispersion are driven off, so that a temperature-resistant and catalyzing layer with a high specific surface area is produced. If necessary, this process was repeated several times in order to achieve a desired layer thickness.
- the washcoat usually consists of a mixture of a transition series aluminum oxide and at least one promoter oxide such as rare earth oxide, zirconium oxide, nickel oxide, iron oxide, germanium oxide and barium oxide.
- the washcoat dispersion must have the best possible flow properties during application to the honeycomb body in order to achieve a desired, uniform layer thickness over the entire channel length. This is particularly important with regard to the channel cross-sections, which are becoming smaller and smaller in recent developments.
- washcoat dispersions In order to achieve such a flow property, known washcoat dispersions have a specific pH, with only a limited proportion of solids being permitted. However, tests have shown that such a washcoat dispersion has a time-dependent viscosity. As a result, the washcoat dispersion gels very quickly and prevents the generation of a uniform layer thickness. This gelling is reinforced in particular in the case of ceramic honeycomb bodies in that the ceramic base material absorbs the liquid component of the washcoat dispersion, as a result of which the solids content of the washcoat dispersion is increased as a percentage.
- washcoat dispersion for applying a washcoat dispersion to a honeycomb body having channels, it is proposed to bring the honeycomb body into contact with the washcoat dispersion, the washcoat dispersion being excited to vibrate at least during application.
- the washcoat dispersion preferably comprises a carrier material uniformly distributed in a carrier fluid with a mixture of stabilized, high-surface aluminum oxide of the transition series and optionally at least one promoter oxide.
- the method has the advantage that the washcoat dispersion gels prematurely during application. This has its origins essentially in the fact that the washcoat dispersion has many constituents of different specific density or mass. As a result, the individual components perform different movements due to the vibrations. This results, for example, in relative movements of the carrier material particles with respect to the carrier fluid, with forces and deformations occurring which prevent or at least significantly reduce the viscosity of the washcoat dispersion over a longer period of time (for example several minutes).
- the washcoat dispersion is excited to vibrate even after application, in particular until An essentially uniform washcoat thickness is produced over a predeterminable length of the channels, which is preferably between 5 and 50 ⁇ m.
- the vibration of the washcoat dispersion thus not only ensures a constant viscosity of the washcoat dispersion over a certain period of time, but also supports the distribution of the washcoat dispersion in the channels of the honeycomb body.
- the washcoat thickness produced depends in particular on the thickness of the channel wall or the free cross-section of the channels, the washcoat thickness being reduced as the channel walls and cross-sections become smaller.
- a washcoat thickness of 10 to 20 ⁇ m is preferred, in particular for channel walls with a thickness of less than 0.03 mm.
- washcoat dispersion by means of a spray or immersion process.
- a spraying process the washcoat dispersion is atomized finely and introduced over at least one end face of the honeycomb body.
- the honeycomb body is at least partially immersed in a basin with the washcoat dispersion, this process preferably taking place only from one end face of the honeycomb body.
- the washcoat dispersion is evenly distributed on the channel walls of the honeycomb body using the capillary action of the channels.
- the washcoat dispersion is excited by vibrating the honeycomb body itself.
- the generation of a vibration of the honeycomb body is simpler and more practical, in particular from the point of view of production engineering and process engineering, particularly with regard to the use of the spraying method for applying the washcoat dispersion.
- the washcoat dispersion used must always be taken into account, since ultimately the relative movements of the carrier materials with respect to the carrier fluid are to be generated in it.
- Investigations have shown that a vibration of the honeycomb body approximately perpendicular to an axis to which the channels are arranged essentially parallel, the maintenance of a certain viscosity of the washcoat dispersion is possible for a particularly long time.
- the focus is on the uniform distribution of the washcoat dispersion over a predeterminable length of the channels, it is advantageous to vibrate the honeycomb body approximately in the direction of an axis to which the channels run essentially parallel.
- the honeycomb body carries out a torsional vibration which preferably has an amplitude close to a circumference of the honeycomb body of less than 5 mm, in particular less than 2 mm.
- a torsional vibration which preferably has an amplitude close to a circumference of the honeycomb body of less than 5 mm, in particular less than 2 mm.
- the channels, which are arranged near the circumference of the honeycomb body oscillate with a relatively small amplitude in an alternating direction of the circumference.
- This also has the consequence that in particular centrally arranged channels be stimulated to vibrate at a lower intensity. This is advantageous, for example, if the length and / or the cross section of the channels is not constant over the cross section of the honeycomb body.
- Such a torsional vibration is therefore particularly well suited, for example, to conical honeycomb bodies which have channels with a greater channel length in the outer edge regions than in central regions.
- the more pronounced vibration in these edge areas of the honeycomb body supports the flow properties of the washcoat dispersion and thus ensures a uniform distribution of washcoat on the channel walls of the honeycomb body.
- washcoat dispersion essentially depends on the channel shape or the channel cross section, it may also be advantageous to combine the different types of vibration with one another.
- the washcoat dispersion is excited with a predeterminable frequency, which can be selected in particular as a function of a consistency of the washcoat dispersion.
- the consistency of the washcoat dispersion can be described using a variety of parameters: e.g. the viscosity, the ratio of carrier material to carrier fluid, type and / or size of the carrier material, density of the carrier fluid, temperature of the washcoat dispersion, pH of the dispersion, surface structure of the carrier material, etc.
- a frequency in the ultrasound range has proven to be particularly advantageous.
- the excitation took place in a frequency range from 20 kHz to 10 MHz.
- Frequencies in the audible range have proven themselves, in particular in the case of indirect excitation, for example due to vibration of the honeycomb body, excitation with a frequency between 20 Hz and 15 in particular kHz has ensured a drop in viscosity over a very long period of time.
- Figure 1 shows schematically and in perspective a metallic honeycomb body
- Figure 2 schematically shows a detailed view of a coated with washcoat
- FIG. 1 shows schematically and in perspective a honeycomb body 1, the honeycomb body 1 shown being formed from sheet metal foils 8, which are partially structured, spirally wound and arranged in a tubular casing 9.
- the partially structured sheet metal foils 8 form channels 2 which are arranged essentially parallel to an axis 6 of the honeycomb body 1.
- the exhaust gas to be cleaned flows through the honeycomb body 1, in which it enters the channels 3 from the end face 11, is guided past the inner channel walls 14 and brought into contact and ultimately emerges on the opposite face.
- such a honeycomb body 1 is brought into contact with a washcoat dispersion, the washcoat dispersion 3 being excited to vibrate at least during application.
- this movement can result from a torsional vibration of the honeycomb body 1 are superimposed, the torsional vibration preferably having an amplitude close to a circumference 7 of less than 5 mm. In this way it is ensured that the honeycomb body 1 has an essentially uniform washcoat thickness 5 (not shown) after the coating process up to a predeterminable length 4 of the channels 2.
- the washcoat dispersion 3 is brought into contact with the honeycomb body 1 in such a way that the end face 11 of the honeycomb body 1 is immersed in a basin with the washcoat dispersion 3. Due to the capillary action in the channels 2, the washcoat dispersion 3 flows through the channels 2.
- Figure 2 shows schematically in a detailed view a channel 2, which is formed with smooth and corrugated metal foils 8.
- a honeycomb structure can also be produced, for example, by stacking smooth and corrugated sheet metal foils 8 and then S-shaped or involute twisting of the sheet metal foils 8.
- the sheet metal foils 8 preferably have a foil thickness 10 of less than 0.03 mm.
- the channels 2 have essentially rectangular cross-sectional areas when the honeycomb body 1 has been extruded from ceramic material.
- the channel 2 shown has on its channel wall 14 a washcoat dispersion 3 with an essentially uniform washcoat thickness 5 of preferably 5 to 50 ⁇ m.
- the washcoat dispersion 3 shown comprises a temperature-resistant carrier material 13 and catalysts 12.
- Oxidic minerals such as aluminum oxide, titanium oxide, silicon oxide, tin oxide, zirconium oxide, magnesium oxide, aluminum silicate, zeolites and / or alkaline earth metal titanate are preferably used as the carrier material.
- the carrier material 13 advantageously additionally comprises promoters such as rare earths, alkaline earth metals and or compounds of the elements of III. to V. main group of the periodic table of the Elements. Metals of the platinum group, such as platinum, palladium and / or rhodium, are usually used as catalyst 12.
- the process according to the invention prevents premature gelation of the washcoat dispersion during and after application to a metallic or ceramic honeycomb body, ensuring a uniform washcoat thickness in the channels of the honeycomb body.
- a honeycomb body as a catalytic converter for cleaning exhaust gases from an internal combustion engine in automobile construction, this leads to a highly effective converter which also withstands the high thermal and dynamic loads in such an exhaust system.
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- Engineering & Computer Science (AREA)
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- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
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- Materials Engineering (AREA)
- Plasma & Fusion (AREA)
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- Biomedical Technology (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10114328.1 | 2001-03-23 | ||
DE10114328A DE10114328A1 (de) | 2001-03-23 | 2001-03-23 | Verfahren zum Auftragen von Washcoat auf einen Wabenkörper |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002076614A1 true WO2002076614A1 (de) | 2002-10-03 |
Family
ID=7678749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/002500 WO2002076614A1 (de) | 2001-03-23 | 2002-03-07 | Verfahren zum auftragen von washcoat auf einen wabenkörper |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10114328A1 (de) |
WO (1) | WO2002076614A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1433528A1 (de) * | 2001-09-28 | 2004-06-30 | Ngk Insulators, Ltd. | Wabenkatalysator und verfahren zur herstellung einer wabenzwischenstufe und eines wabenkatalysators |
WO2007007370A1 (ja) | 2005-07-07 | 2007-01-18 | Cataler Corporation, | 基材コーティング装置及び方法 |
WO2013079448A3 (de) * | 2011-11-30 | 2014-04-03 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Diffusionssperrschicht bei einer abgasbehandlungseinheit |
CN111601659A (zh) * | 2018-01-16 | 2020-08-28 | 优美科股份公司及两合公司 | 用于生产scr催化转化器的超声辅助方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10329162A1 (de) | 2003-06-27 | 2005-01-13 | Alstom Technology Ltd | Katalytischer Reaktor und zugehöriges Betriebsverfahren |
DE102009056145B3 (de) | 2009-11-27 | 2011-07-28 | Süd-Chemie AG, 80333 | Beschichtungssuspension zur Beschichtung von Katalysatorsubstraten |
DE102017115138A1 (de) * | 2017-07-06 | 2019-01-10 | Umicore Ag & Co. Kg | Kontaktlose Nivellierung einer Washcoatsuspension |
DE102018100833A1 (de) * | 2018-01-16 | 2019-07-18 | Umicore Ag & Co. Kg | Verfahren zur Herstellung eines SCR-Katalysators |
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EP1433528A1 (de) * | 2001-09-28 | 2004-06-30 | Ngk Insulators, Ltd. | Wabenkatalysator und verfahren zur herstellung einer wabenzwischenstufe und eines wabenkatalysators |
EP1433528A4 (de) * | 2001-09-28 | 2006-01-04 | Ngk Insulators Ltd | Wabenkatalysator und verfahren zur herstellung einer wabenzwischenstufe und eines wabenkatalysators |
WO2007007370A1 (ja) | 2005-07-07 | 2007-01-18 | Cataler Corporation, | 基材コーティング装置及び方法 |
EP1900442A1 (de) * | 2005-07-07 | 2008-03-19 | Cataler Corporation | Vorrichtung und verfahren zum beschichten von basismaterial |
EP1900442A4 (de) * | 2005-07-07 | 2010-11-10 | Cataler Corp | Vorrichtung und verfahren zum beschichten von basismaterial |
WO2013079448A3 (de) * | 2011-11-30 | 2014-04-03 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Diffusionssperrschicht bei einer abgasbehandlungseinheit |
KR101615841B1 (ko) * | 2011-11-30 | 2016-04-26 | 콘티넨탈 에미텍 페어발퉁스 게엠베하 | 배기 가스 처리 유닛의 확산 장벽층 |
US9433897B2 (en) | 2011-11-30 | 2016-09-06 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Process for producing a diffusion barrier layer and process for producing an exhaust gas treatment unit |
RU2596561C2 (ru) * | 2011-11-30 | 2016-09-10 | Эмитек Гезельшафт Фюр Эмиссионстехнологи Мбх | Блокирующий диффузию слой в устройстве для очистки отработавшего газа |
CN111601659A (zh) * | 2018-01-16 | 2020-08-28 | 优美科股份公司及两合公司 | 用于生产scr催化转化器的超声辅助方法 |
CN111601659B (zh) * | 2018-01-16 | 2023-09-01 | 优美科股份公司及两合公司 | 用于生产scr催化转化器的超声辅助方法 |
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