DE102007056213A1 - Method for producing a shaped body through which exhaust gas can flow and exhaust system of an internal combustion engine - Google Patents
Method for producing a shaped body through which exhaust gas can flow and exhaust system of an internal combustion engine Download PDFInfo
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- DE102007056213A1 DE102007056213A1 DE102007056213A DE102007056213A DE102007056213A1 DE 102007056213 A1 DE102007056213 A1 DE 102007056213A1 DE 102007056213 A DE102007056213 A DE 102007056213A DE 102007056213 A DE102007056213 A DE 102007056213A DE 102007056213 A1 DE102007056213 A1 DE 102007056213A1
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- shaped body
- catalytically active
- active material
- exhaust system
- specific amount
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000011149 active material Substances 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 32
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 24
- 230000003197 catalytic effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims 1
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims 1
- 239000005695 Ammonium acetate Substances 0.000 claims 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims 1
- 235000021355 Stearic acid Nutrition 0.000 claims 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims 1
- 229940043376 ammonium acetate Drugs 0.000 claims 1
- 235000019257 ammonium acetate Nutrition 0.000 claims 1
- 229920001577 copolymer Polymers 0.000 claims 1
- 229920000831 ionic polymer Polymers 0.000 claims 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims 1
- 239000011976 maleic acid Substances 0.000 claims 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims 1
- 239000012188 paraffin wax Substances 0.000 claims 1
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 claims 1
- 239000008117 stearic acid Substances 0.000 claims 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 29
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 8
- 238000013316 zoning Methods 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 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 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000009924 canning Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 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 1
- 238000007598 dipping method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material 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
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J33/00—Protection of catalysts, e.g. by coating
-
- B01J35/56—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
-
- 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
- B01J37/0217—Pretreatment of the substrate before 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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0219—Coating the coating containing organic compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
-
- B01J35/19—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
- F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
-
- 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
Abstract
Ein Formkörper (20) für einen Katalysator einer Abgasanlage einer Brennkraftmaschine ist bereichsweise mit einem katalytisch wirksamen Material (40) beschichtet. Er wird folgendermaßen hergestellt: (a) Aufbringen eines hydrophoben Materials (30) auf die Oberfläche eines ersten Teilbereichs (28b) des Formkörpers (20), wobei in dem ersten Teilbereich (28b) eine spezifische Menge des katalytisch wirksamen Materials (40) geringer sein soll als in einem zweiten Teilbereich (28a); (b) Aufbringen eines hydrophilen katalytisch wirksamen Materials (40).A shaped body (20) for a catalytic converter of an exhaust system of an internal combustion engine is coated in regions with a catalytically active material (40). It is produced as follows: (a) applying a hydrophobic material (30) to the surface of a first portion (28b) of the shaped body (20), wherein in the first portion (28b) a specific amount of the catalytically active material (40) is lower should be considered as in a second subarea (28a); (b) applying a hydrophilic catalytically active material (40).
Description
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zur Herstellung eines von Abgas durchströmbaren Formkörpers nach dem Oberbegriff des Anspruchs 1 sowie eine Abgasanlage einer Brennkraftmaschine nach dem Oberbegriff des nebengeordneten Patentanspruchs.The The invention relates to a method for producing an exhaust gas through which Molding after The preamble of claim 1 and an exhaust system of an internal combustion engine according to the preamble of the independent patent claim.
Vom Markt her bekannt ist eine Abgasanlage für einen selbstzündenden Kolbenmotor, die einen vorgeschalteten Dieseloxidationskatalysator, auch DOC genannt, und einen. nachgeschalteten Dieselpartikelfilter, auch DPF genannt, umfasst. Für den Dieselpartikelfilter wird meist ein hochporöser wabenförmiger Keramik-Formkörper verwendet mit wechselseitig verschlossenen Kanälen.from Market ago is known an exhaust system for a self-igniting Piston engine having an upstream diesel oxidation catalyst, also called DOC, and one. downstream diesel particulate filter, also called DPF. For The diesel particulate filter is usually a highly porous honeycomb ceramic molded body used with mutually closed channels.
Die katalytische Funktion des Dieseloxidationskatalysators wird in der Regel durch eine katalytisch wirksame Schicht bewirkt, die auf ein wabenförmiges Substrat mit eher geringer Porosität aufgebracht wird. In diesem Substrat sind nebeneinander angeordnete und beidseitig offene Kanäle vorhanden, durch die das Abgas im Betrieb der Abgasanlage hindurchströmt. Bei dem wabenförmigen Substrat handelt es sichum einen im Wesentlichen zylindrischen Formkörper, welcher mit einem katalytisch wirksamen Material beschichtet ist. Neben dem oxidativen Umsatz von Kohlenwasserstoffen, Kohlenmonoxid und Stickoxid zur Schonung der Umwelt werden die exothermen Oxidationsreaktionen des Oxidationskatalysators auch für die thermische Regeneration des meist stromabwärts vom Oxidationskatalysator angeordneten Partikelfilters genutzt.The catalytic function of the Dieseloxidationskatalysators is in the Usually caused by a catalytically active layer on a honeycombed Substrate is applied with rather low porosity. In this Substrate are arranged side by side and open on both sides channels, through which the exhaust gas flows during operation of the exhaust system. at the honeycomb Substrate is a substantially cylindrical shaped body, which coated with a catalytically active material. Next the oxidative conversion of hydrocarbons, carbon monoxide and Nitric oxide to protect the environment are the exothermic oxidation reactions of the oxidation catalyst also for the thermal regeneration most downstream utilized by the oxidation catalyst arranged particulate filter.
Offenbarung der ErfindungDisclosure of the invention
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren der eingangs genannten Art bereitzustellen, welches die Herstellung eines Formkörpers gestattet, der besonders stabil ist und eine lange Lebensdauer aufweist. Aufgabe der vorliegenden Erfindung ist es ferner, eine Abgasanlage mit einem entsprechenden Formkörper bereitzustellen.task The present invention is a method of the aforementioned To provide a type which allows the production of a molding, which is particularly stable and has a long life. task The present invention is further, an exhaust system with a corresponding shaped body provide.
Diese Aufgabe wird gelöst durch ein Verfahren mit den Merkmalen des Anspruchs 1 und durch eine Abgasanlage mit den Merkmalen des nebengeordneten Patentanspruchs. Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben. Für die Erfindung wichtige Merkmale finden sich darüber hinaus in der nachfolgenden Beschreibung und in der Zeichnung, wobei die Merkmale sowohl in Alleinstellung als auch in ganz unterschiedlichen Kombinationen für die Erfindung wichtig sein können, ohne dass hierauf explizit hingewiesen wird.These Task is solved by a method having the features of claim 1 and by a Exhaust system with the features of the independent patent claim. Advantageous developments of the invention are specified in subclaims. For the Invention important features are also found in the following Description and in the drawing, the features both in isolation as well as in very different combinations for the invention can be important without that this is explicitly pointed out.
Das erfindungsgemäße Verfahren hat den Vorteil, dass der Formkörper nur teilweise bereichsweise mit dem katalytisch wirksamen Material beschichtet ist. Es sind also Bereiche des Formkörpers im Wesentlichen frei von Partikeln der nachträglich aufgebrachten katalytisch wirksamen Beschichtung. Da diese Partikel die Materialkennwerte des Basismaterials des Formkörpers ungünstig beeinflussen können, bleibt dank des erfindungsgemäßen Verfahrens die Festigkeit jener Bereiche, die nicht mit dem katalytisch wirksamen Material beschichtet sind, erhalten. Hierdurch wird die Festigkeit und die Lebensdauer des entsprechenden Formkörpers und des aus diesem gebildeten Katalysators oder Partikelfilters verbessert.The inventive method has the advantage that the molding only partially regionally with the catalytically active material is coated. Thus, areas of the shaped body are essentially free of particles of the subsequently applied catalytically active coating. Because these particles are the material characteristics the base material of the molding unfavorable can influence remains thanks to the method according to the invention the strength of those areas that are not compatible with the catalytically active Material coated are obtained. This will increase the strength and the life of the corresponding molded body and the formed therefrom Catalyst or particulate filter improved.
Grundlage der vorliegenden Erfindung ist unter anderem die Erkenntnis, dass in dem keramischen Formkörper Mikrorisse vorhanden sind, in denen sich Partikel der katalytisch wirksamen Beschichtung ablagern können. Da diese eine andere thermische Ausdehnung als Formkörper aufweisen, kann es bei thermischer Belastung zu einem lokalen Spannungsaufbau kommen, welcher die Dauerhaltbarkeit des keramischen Formkörpers gefährden kann. Dies kann durch das erfindungsgemäße Verfahren gezielt in jenen Bereichen verhindert werden, in denen die größten Spannungen erwartet werden.basis One of the objects of the present invention is the recognition that in the ceramic molding Microcracks are present in which particles of the catalytic can deposit effective coating. Because this is another thermal Expansion as a shaped body can under thermal stress to a local stress build-up come, which can endanger the durability of the ceramic molding. This can be targeted by the method according to the invention in those Areas where the greatest tensions are expected.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens liegt in einer Einsparung der für die Beschichtung mit dem katalytisch wirksamen Material erforderlichen Materialmenge. Es wurde nämlich erkannt, dass auf Grund von Strömungs- und Temperaturunterschieden im Inneren des Formkörpers die katalytisch aktiven Materialien in einigen Bereichen wesentlich effizienter arbeiten als in anderen Bereichen des Formkörpers. Dank des erfindungsgemäßen Verfahrens kann in jenen Bereichen, in denen ohnehin eine reduzierte Effizienz zu erwarten ist, das Material komplett oder zumindest in erheblichem Umfang eingespart werden.One Another advantage of the method lies in a Saving the for the coating with the catalytically active material required Amount of material. It became namely realized that due to flow and temperature differences in the interior of the shaped body, the catalytically active Materials work much more efficiently in some areas than in other areas of the molding. Thanks to the method according to the invention can in those areas where already a reduced efficiency is expected, the material completely or at least in significant Scope be saved.
In einer ersten Weiterbildung des erfindungsgemäßen Verfahrens wird vorgeschlagen, dass das hydrophobe Material lediglich auf einen radial äußeren Teilbereich eines zylindrischen Formkörpers aufgebracht wird. Hierdurch wird letztlich ein Formkörper hergestellt, bei dem die spezifische Menge des katalytisch wirksamen Materials in dem ersten und radial äußeren Teilbereich des Formkörpers geringer ist als in einem zweiten und radial inneren Teilbereich. Dies wird auch als "radiales Zoning" bezeichnet. Dem liegt die Überlegung zu Grunde, dass bei Katalysatoren und Partikelfiltern der keramische Formkörper üblicherweise in einem Gehäuse montiert wird (Canning), was dazu führt, dass der äußere radiale Teilbereich und die Außenoberfläche des keramischen Formkörpers unter Betriebsbedingungen vergleichsweise langsam erwärmt werden, vergleichsweise niedrige Maximaltemperaturen erreichen und darüber hinaus vom Abgas nicht so stark durchströmt werden als andere Bereiche. Durch die vorliegende Weiterbildung des erfindungsgemäßen Verfahrens können daher Kostenvorteile realisiert werden, weil diese Teilbereiche nicht oder nur mit einer geringeren Menge an katalytisch aktivem Material beschichtet werden. Ferner hat diese Weiterbildung auch Vorteile bei der Handhabung des Formkörpers: Das katalytisch wirksame Material enthält nämlich in manchen Fällen gesundheitsgefährdende Stoffe. Durch eine unbeschichtete Außenfläche des Formkörpers wird die Gefährdung einer Person, die den Formkörper handzuhaben hat, reduziert.In a first development of the method according to the invention, it is proposed that the hydrophobic material is applied only to a radially outer portion of a cylindrical shaped body. As a result, a shaped body is ultimately produced in which the specific amount of the catalytically active material in the first and radially outer subarea of the shaped body is smaller than in a second and radially inner subarea. This is also called "radial zoning". This is based on the consideration that in the case of catalysts and particle filters, the ceramic molding is usually mounted in a housing (canning), which results in the outer radial subregion and the outer surface of the ceramic molding being heated comparatively slowly under operating conditions reach low maximum temperatures and, moreover, the exhaust gas does not flow through as strongly as other areas. The present development of the method according to the invention can therefore cost advantages can be realized because these sections are not coated or only with a smaller amount of catalytically active material. Furthermore, this development also has advantages in the handling of the molded article: namely, the catalytically active material contains in some cases harmful substances. By an uncoated outer surface of the molding, the risk to a person who has to handle the molding is reduced.
Das hydrophobe Material kann dadurch auf den radial äußeren Teilbereich des zylindrischen Formkörpers aufgebracht werden, indem der Formkörper durch ein Tauchbad mit dem hydrophoben Material, dessen Tiefe geringer ist als der halbe Durchmesser des Formkörpers gerollt oder in diesem gedreht wird. Dieses Verfahren kann einfach und kostengünstig realisiert werden.The hydrophobic material can thereby be applied to the radially outer portion of the cylindrical shaped body be by the molding by immersion with the hydrophobic material, whose depth is less is rolled as half the diameter of the molding or rotated in this becomes. This method can be realized easily and inexpensively.
Vorteilhafterweise wird nach dem Aufbringen des hydrophilen katalytisch wirksamen Materials das hydrophobe Material entfernt. Hierdurch wird verhindert, dass es im Betrieb des Katalysators beziehungsweise des Partikelfilters zu unerwünschten thermischen Reaktionen zwischen dem hydrophoben Material und dem Basismaterial des Formkörpers kommt.advantageously, is after the application of the hydrophilic catalytically active material removed the hydrophobic material. This prevents that it during operation of the catalyst or the particulate filter to undesirable thermal Reactions between the hydrophobic material and the base material of the molding comes.
Das hydrophobe Material kann jedoch nicht nur dazu eingesetzt werden, eine Beschichtung des ersten Teilbereichs mit dem katalytisch wirksamen Material vollständig zu verhindern, sondern auch dazu, zwar eine gewisse Beschichtung des ersten Teilbereichs mit katalytisch wirksamen Material zuzulassen, jedoch nur mit einer geringeren Dicke. Hierzu werden unterschiedliche hydrophobe Materialien eingesetzt oder das gleiche Material, aber in unterschiedlicher Konzentration und/oder Dicke. Damit kann für den Formkörper eine auf den jeweiligen Einsatzzweck ausgerichtetes optimale Verteilung der katalytisch wirksamen Schicht erhalten werden. Möglich ist es beispielsweise, dass sich am Formkörper die spezifische Menge des katalytisch wirksamen Materials von einem Ort des Formkörpers zu einem anderen Ort kontinuierlich ändert, oder dass sich die spezifische Menge sprunghaft ändert. Vor allem eine kontinuierliche Änderung sorgt für eine nochmalige Reduktion unerwünschter Spannungen im Formkörper im Betrieb der Abgasanlage.The However, hydrophobic material can not only be used to a coating of the first portion with the catalytically active material Completely to prevent, but also to, although a certain coating of the first sub-range with catalytically active material, but only with a smaller thickness. This will be different used hydrophobic materials or the same material, but in different concentration and / or thickness. This can for the molding a optimized distribution for the respective application the catalytically active layer can be obtained. Is possible for example, that the specific amount of the molded body the catalytically active material from a location of the shaped body to another place continuously changes, or that the specific Amount changes abruptly. Especially a continuous change takes care of a further reduction of unwanted Tensions in the molding during operation of the exhaust system.
Das oben beschriebene "radiale Zoning" kann auch mit einem Verfahren zum Herstellen eines "axialen Zonings" kombiniert werden. Bei einem solchen axialen Zoning unterscheidet sich die spezifische Menge des katalytisch wirksamen Materials von einem axialen Ort des Formkörpers zu einem anderen, also von einem stromaufwärtigen Bereich des Formkörpers zu einem stromabwärtigen Bereich, in einer vorgegebenen Art und Weise.The described above "radial Zoning "can too be combined with a method of producing "axial zoning". In such a Axial zoning differs the specific amount of the catalytic effective material from an axial location of the molding to another, that is from an upstream region of the molding to a downstream one Area, in a given way.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Nachfolgend werden Ausführungsformen der vorliegenden Erfindung unter Bezugnahme auf die beiliegende Zeichnung näher erläutert. In der Zeichnung zeigen:following Become embodiments of the present invention with reference to the accompanying drawings explained in more detail. In show the drawing:
Ausführungsformen der Erfindungembodiments the invention
In
Der
Oxidationskatalysator
Der
Partikelfilter
Um
die Formkörper
Eine
exemplarisch und schematisch dargestellte Cordierit-Wand eines der
beiden Formkörper
In
einem zweiten Verfahrensschritt wird nun eine hydrophile, beispielsweise
auf Wasser basierende Schicht
In
einem abschließenden
Schritt wird die Schicht des hydrophoben Materials
Mittels
des angegebenen Verfahrens kann ein Formkörper
Die
oben im Zusammenhang mit den
Claims (12)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007056213A DE102007056213A1 (en) | 2007-11-22 | 2007-11-22 | Method for producing a shaped body through which exhaust gas can flow and exhaust system of an internal combustion engine |
PCT/EP2008/064819 WO2009065719A1 (en) | 2007-11-22 | 2008-10-31 | Method for producing a molded part through which exhaust gas can flow, and exhaust system of an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007056213A DE102007056213A1 (en) | 2007-11-22 | 2007-11-22 | Method for producing a shaped body through which exhaust gas can flow and exhaust system of an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
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DE102007056213A1 true DE102007056213A1 (en) | 2009-05-28 |
Family
ID=40373530
Family Applications (1)
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DE102007056213A Withdrawn DE102007056213A1 (en) | 2007-11-22 | 2007-11-22 | Method for producing a shaped body through which exhaust gas can flow and exhaust system of an internal combustion engine |
Country Status (2)
Country | Link |
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DE (1) | DE102007056213A1 (en) |
WO (1) | WO2009065719A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010053603A1 (en) * | 2010-11-12 | 2012-05-16 | Bayerische Motoren Werke Aktiengesellschaft | Catalyzer e.g. particulate filter, for cleaning exhaust gas in self-ignition engine, has carrier structure with total passage area that is divided into partial cross sections, where one of sections is radially enclosed by other section |
GB2581776B (en) * | 2019-02-19 | 2022-08-17 | Jaguar Land Rover Ltd | Catalytic converter core having first and second regions with different thermal inertia |
US11541380B2 (en) | 2020-09-23 | 2023-01-03 | Southwest Research Institute | Superhydrophobic coatings for deposit reduction in selective catalytic reductant systems |
WO2023096764A1 (en) * | 2021-11-24 | 2023-06-01 | Corning Incorporated | Wall flow honeycomb filters and method of manufacture |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016202610A1 (en) * | 2016-02-19 | 2017-08-24 | Dürr Systems GmbH | Process for producing a porous functional body |
CN110215830B (en) * | 2019-05-21 | 2021-07-27 | 东南大学 | Bionic catalytic filter material and preparation method and application thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3912915C1 (en) * | 1989-04-20 | 1990-12-13 | Degussa Ag, 6000 Frankfurt, De | |
DE10254661A1 (en) * | 2002-11-22 | 2004-06-09 | Umicore Ag & Co.Kg | Process for coating a catalyst carrier comprising two different substructures with a catalytically active coating and catalyst obtained thereby |
EP1699554A4 (en) * | 2003-12-31 | 2007-12-26 | Corning Inc | Ceramic structures having hydrophobic coatings |
EP1598111A1 (en) * | 2004-05-15 | 2005-11-23 | Delphi Technologies, Inc. | Catalyst concentration gradient in a catalysed filter |
DE102007029418A1 (en) * | 2007-06-26 | 2009-01-08 | Robert Bosch Gmbh | Catalyst element, catalyst for exhaust aftertreatment of an internal combustion engine and method for producing a catalyst element according to the invention |
-
2007
- 2007-11-22 DE DE102007056213A patent/DE102007056213A1/en not_active Withdrawn
-
2008
- 2008-10-31 WO PCT/EP2008/064819 patent/WO2009065719A1/en active Application Filing
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010053603A1 (en) * | 2010-11-12 | 2012-05-16 | Bayerische Motoren Werke Aktiengesellschaft | Catalyzer e.g. particulate filter, for cleaning exhaust gas in self-ignition engine, has carrier structure with total passage area that is divided into partial cross sections, where one of sections is radially enclosed by other section |
GB2581776B (en) * | 2019-02-19 | 2022-08-17 | Jaguar Land Rover Ltd | Catalytic converter core having first and second regions with different thermal inertia |
US11541380B2 (en) | 2020-09-23 | 2023-01-03 | Southwest Research Institute | Superhydrophobic coatings for deposit reduction in selective catalytic reductant systems |
WO2023096764A1 (en) * | 2021-11-24 | 2023-06-01 | Corning Incorporated | Wall flow honeycomb filters and method of manufacture |
Also Published As
Publication number | Publication date |
---|---|
WO2009065719A1 (en) | 2009-05-28 |
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