DE102004052563A1 - Coating components with alumina comprises heating component coated with aluminum hydroxide prepared by adding excess aluminum or aluminum alloy to basic aqueous aluminate solution - Google Patents

Abstract

Coating components with alumina comprises coating a component with aluminum hydroxide prepared by adding excess aluminum or aluminum alloy to a basic aqueous aluminate solution at up to 40[deg]C, and heating the coated component. Independent claims are also included for the following: (1) a coated component produced as above; (2) a catalytic converter, particulate filter and particulate filter/catalytic converter system comprising at least one component partially coated as above.

Description

The The present invention relates to a process for the preparation of Coatings on components, in particular of catalysts and Soot filters, with Aluminum oxides.

catalysts soot filter and catalysts / soot filter assemblies find particular use in the automotive industry. For after the Otto engine principle working internal combustion engines are already For years very well functioning three-way catalysts, which in particular as Oxidation catalysts work, available. With increasing age lets her catalytic effect, which is partly due to the loss of catalytic Active substances by removal of the same in the exhaust stream or chemical inactivation thereof by substances present in the exhaust gas stream, on the other hand solves also applied to the catalyst components and the catalytically active substances containing coating of the components from.

in the Unlike gasoline engines are ready for diesel engines in series catalyst / soot filter Although developed and partly in use, but wise these compared with the known from the gasoline engines three-way catalysts still disadvantages. The present invention finds use especially in the field of diesel engines, but also other internal combustion engines including Gasoline engines, and can about it be transferred to adjacent technical areas.

Within the European Union plans are underway, from 2005 limits both for the Nitric oxide and soot emissions for the tighten motor-powered motor vehicles. However, by structural changes the diesel engines only one of the two aforementioned pollutant emissions be reduced, in which case at the same time the other pollutant component an increased Emission has. Therefore, you can the planned limit values planned by the European Union be respected only if an after treatment of the exhaust gas of Diesel engines takes place.

To reduce soot emissions are currently mainly used soot filters. These are then arranged spatially separated together with corresponding catalysts in the exhaust passage of a motor vehicle. For example, disclosed EP 0 835 684 A2 a method for the treatment of exhaust gases of small cars and passenger cars, in which case the exhaust gas is passed over two catalysts connected in series. The first catalyst oxidizes the nitrogen monoxide contained in the exhaust gas to nitrogen dioxide, in which case the second catalyst / soot filter ensures that the deposited on this soot particles are oxidized by the previously formed nitrogen dioxide to carbon dioxide, whereas the nitrogen dioxide to nitric oxide and optionally also to nitrogen is reduced.

Instead of a second catalyst may also be a pure soot filter be provided as disclosed in WO 99/09307. In which disclosed therein is a part of the purified exhaust gas via a cooler passed and then admixed with the intake air of the diesel engine.

The Exhaust gas from diesel engines includes in addition to the aforementioned nitrogen oxides and soot emissions nor carbon monoxide, unburned hydrocarbons and sulfur oxides and other volatile Organic components (VOC: Volatile Organic Compounds). Latter deposit on the carbon nucleus contained in the exhaust gas and form soot particles, on which also sulfates can be absorbed.

A major problem with soot deposition in the catalyst is that with increasing soot loading, the flow resistance of the catalyst / soot filter increases. Therefore, the filters must be regenerated by combustion of the soot, for example by provid- ing additional heating elements in the catalyst / soot filter. Alternatively, fuel additives may be provided for regeneration of the particulate filters, or additives may be added directly into the exhaust system to the catalyst / soot filter. In a thermal combustion of the soot particles very high temperatures significantly above 600 ° C are necessary, which can be lowered by Providence of catalyst additives. In order to completely remove the soot particles from the catalyst / soot filter according to the EP 0 835 684 A2 a sufficient amount of nitrogen dioxide must be present. This is countered by the fact that modern diesel engines usually have an exhaust gas recirculation (so-called EGR system) to reduce nitrogen oxide emissions. Therefore, it is necessary to maximize the amount of nitrogen dioxide in the exhaust gas with respect to the combustion of the soot particles, especially catalytically.

However, the prerequisite for a long-lasting catalytic or filter activity of catalysts, soot filters and combined catalyst / soot filter arrangements is always the coating applied to the respective components. For this purpose, various proposals have already been made in the past, with the coating means aluminum umoxiden has prevailed by so-called dispersion coating process predominantly. In a dispersion coating process, an aqueous dispersion, in particular of γ-aluminum oxide, is introduced into which the component to be coated is immersed and then dried and calcined. In this method, however, remains a so-called washcoat especially in the coating of fiber components or knitted fabric between the fibers, whereby the flow resistance is increased.

task It is therefore the object of the present invention to provide a process for the preparation of coatings on components, in particular for catalysts, soot filters and catalysts / soot filter assemblies for disposal to ask, by means of which even a high demands fair expectant coating with large surface is achieved, which in particular those of the prior art known disadvantageously high flow resistance avoids.

• – in einem ersten Schritt das Bauteil mit einer aluminiumhydroxidhaltigen Schicht versehen wird, wobei die Beschichtung mit einer aluminathaltigen wässrigen basischen Lösung unter Zugabe von Aluminium und/oder Aluminiumlegierungen in nichtstöchiometrischen Mengen im Überschuss erhalten wird, wobei die Temperatur der mit Aluminium und/oder der Aluminiumlegierung versetzten Lösung bis zu etwa 40 °C maximal beträgt; und
• – in einem zweiten Schritt das mit Aluminiumhydroxiden beschichtete Bauteil zur Bildung einer aluminiumoxidhaltigen Beschichtung in der Hitze getrocknet wird.

This object is achieved by a method for producing coatings on components, in particular of catalysts and / or soot filters, with aluminum oxides, wherein

• - In a first step, the component is provided with an aluminum hydroxide-containing layer, wherein the coating is obtained with an aluminate aqueous base solution with the addition of aluminum and / or aluminum alloys in non-stoichiometric amounts in excess, the temperature of the aluminum and / or the aluminum alloy offset solution is up to about 40 ° C maximum; and
• - In a second step, the coated with aluminum hydroxide component to form an aluminum oxide-containing coating is dried in the heat.

Prefers is the temperature of aluminum and / or aluminum alloy staggered solution up to about 35 ° C or less, more preferably up to about 30 ° C or less.

When Aluminum-containing alloys include those made of aluminum with copper, nickel, cobalt and / or silver. In particular, too several aluminum-containing alloys are used, in particular also in mixture with metallic aluminum.

Under Components within the meaning of the present invention are carrier bodies, molded parts, Filter elements, metal foils, mesh fabrics and knitted fabrics (nonwovens) or similar understood which with a carrier coating in particular for increasing a catalytic activity or provided a filter activity can be. It can The components can be of metallic origin, but they can also be made of ceramic Be made of materials and sintered in particular. The To be coated component can be made of materials a group comprising papers, textiles, polymer membranes, metals, Plastics, fibrous materials (here in particular nonwovens, felts, knitted fabrics and / or knitted fabrics), ceramic materials and / or combinations thereof. More preferably, the components to be coated are made of metals and / or ceramic materials in powder and / or Fiber form.

When Metallic materials are not just materials made of pure metals, but also materials made of metal alloys and / or material mixtures of different metals and metal alloys for that too coating component usable. These include in particular steels, preferably Chrome-nickel steels, Bronzes, nickel base alloys, Hastalloy, Inconel or the like, wherein the material mixtures may contain high melting components such as for example platinum. The component to be coated can also be made of fibers be prepared, preferred are those based on iron materials (For example, according to the German Material standards 1.4404, 1.4767 or 1.4841) and / or alloys based on iron-chromium-aluminum or nickel-aluminum.

The Components can be coated in whole or in part. There is also one Coating by screen printing possible, using masks Subsections of the component are covered and then the Coating is done. Possible Catalyst and / or soot filter elements are, for example, the wall-flow filters known from the prior art, which made of a porous honeycombs consist of mutually closed flow channels. This honeycomb body can in a jacket tube or converter in the exhaust system of a motor vehicle to be ordered.

As a filter and / or catalyst arrangements are particularly suitable in DE 197 04 147 A1 revealed arrangement. Particular preference is given to catalyst and / or soot filter arrangements which on the one hand comprise a carrier body, for example a metal foil with or without embossing, for achieving flow guidance, as well as a filter body, in particular a wire mesh or knitted fabric or else a nonwoven fabric, in particular a sintered one. Such catalyst and / or Rußfilteranordnungen can be arranged in a jacket tube in the exhaust passage of a motor vehicle. In such catalyst and / or Rußfilteranordnungen on the one hand only partially the filter element or else the carrier body, or in particular the interior of the jacket tube, may also be partially coated, but it is also possible for both the carrier body and the filter element and optionally the interior of the jacket tube to be at least partially coated.

The inventive method can thus find particular application on the one hand in the production coatings of catalyst and / or soot filter assemblies, such as these For example, in WO 99/09307 disclosed, on the other hand in particular even in the manufacture of coatings of spatially not separate catalyst and / or Rußfilteranordnungen, which the big one Have advantage that this space-saving in the exhaust system of a Motor vehicle can be arranged. Basically, the with the method according to the invention coated components for Catalyst and / or soot filter arrangements as well as the initial equipment as well as for the retrofit be provided.

The Catalyst and / or soot filter arrangements can in the direction of this flowing through the particle and exhaust gas flow a gradient not only in the cell density of the carrier body or the porosity have the filter element, but also in the strength of Coating. So can on the respective vehicle type matched catalysts or Rußfilteranordnungen to be provided. these can for example, also formed in the form of known disk catalysts be.

The essential advantage of the method according to the invention is that an aluminum oxide-containing coating can be achieved on components which adhere exclusively to the components themselves, and not to any cavities present in these components. As a result, the flow resistance of the components coated by the method according to the invention is advantageously lowered in comparison to the dispersion coating method known in particular from the prior art. In addition, long-term tests have shown that the coatings obtained by the process according to the invention have excellent stability and also a very large surface area. Thus, the aluminum oxide-containing coatings obtained after drying (calcination) at up to 650 ° C have a specific surface area, measured by the BET method, of at least 5 m ² / g, preferably more than 10 m ² / g, more preferably more than 50 m ² / g, even more preferably more than 100 m ² / g. The alumina is activated alumina having the various metal structures of the transition series of the crystallographic phases of the alumina. These arise as a function of the temperature used for drying, in detail χ-, η-, γ-, κ-, δ- and θ-Al ₂ O ₃ are mentioned. At a calcination up to 650 ° C, especially γ- Al ₂ O _{3 is} present.

It is essential in the method according to the invention that initially an aluminate solution is obtained, this being preferably formed by addition of an aqueous sodium hydroxide solution to metallic aluminum. In this case, sodium hydroxide solution is added in excess, so that the aluminum hydroxide formed in the meantime as a precipitate dissolves again and goes into solution as aluminate. This can be represented by the following equation: NaOH + Al (OH) ₃ ⇆Al (OH) ₄ ^- + Na ⁺

It can but also other suitable hydroxides are used, in particular Alkali and / or alkaline earth hydroxides, e.g. Potassium hydroxide.

The Aluminate formation can already in the presence of the to be coated Components take place (in situ method), but preferably takes place the introduction of the component only after generation of the aluminate solution and before adding the aluminum and / or the aluminum alloy. Then you can the aluminate solution be added more alkali, but in particular are metallic Aluminum and / or aluminum alloys in non-stoichiometric Quantities in excess added, whereby the balance according to the above equation the side of the aluminum hydroxide shifts. When adding the Aluminum and / or the aluminum-containing alloy develops while still hydrogen, which ensures a movement of the solution. Advantageously, however, both the aluminate solution and / or stirred after the addition of the aluminum and / or the aluminum alloy. Thereby, that when adding the aluminum and / or aluminum-containing alloy to the aluminate solution care is taken that the temperature of the solution itself does not exceed 40 ° C, As a result, the result is a very even coating by a controlled slow deposition of the aluminum hydroxide only on the components themselves and not on in the component itself contained spaces. In addition, through this litigation Ensures that a formation of plaques from on a component deposited aluminum hydroxide is avoided. Show plaques a lower catalytic active surface, also dissolve after one subsequent drying or calcination to alumina or easier to remove from the components during operation.

The deposited aluminum hydroxide is mainly in the form of bayerite and has a specific surface area (BET) before drying / calcination of at least about 1 m ² / g, preferably more than about 2 m ² / g.

By the addition of aluminum and / or aluminum alloys to the aluminate solution in excess will according to the above Lye, in particular caustic soda, released, d. H. this regenerates. This then solves re-added aluminum and / or aluminum alloy, thereby the coating reaction is kept going.

Favorable Way the component is mounted in the coating device in such a way that a flow the solution contained in the coating apparatus via a Control to achieve a high uniformity of the coating as well on the inside, in particular, nonwovens, knitted fabrics or the like is achieved. It can be provided that the leadership of Solution, from which progressing aluminum hydroxide separates, can be done by pressure through the component.

Favorable Way is the ratio of Aluminum and / or the aluminum alloy to that in the solution Lye at least 2: 1, preferably at least 3: 1, more preferably at least 4: 1, more preferably up to 10: 1, in particular when metallic aluminum is used. Advantageously In the first step, metallic aluminum in the form of powder, Drops and / or chips added. Particularly preferred is the addition of chips since has been shown that due to the lower active surface of the same especially in comparison to aluminum powder, the control of the reaction and ultimately the rate of formation of the aluminum hydroxide precipitate is ensured. aluminum chips can for example, by scraping aluminum metallic blocks by means of conventional tools to be obtained. The chips preferably have a length in a range of about 50 μm up to about 100 mm. More preferably, these have a mean Thickness, measured over the entire length, in a range of about 5 μm up to 1000 μm, preferably about 200 to 600 microns on.

Prefers is the concentration of the lye used, in particular caustic soda, for the preparation of the aluminate solution in a range of about 2 to about 12 g / L, more preferably in a range of about 4 g / l to about 9 g / l, and is added after addition of the aluminum and / or the aluminum-containing alloy approximately in held in this area. Sodium hydroxide solution is therefore preferably in addition to Aluminum and / or aluminum alloys in the first step of the method according to the invention for the deposition of the aluminum hydroxide, whereby the complete dissolution of the added aluminum and / or the aluminum alloy ensured becomes. However, the sodium hydroxide solution is added in less than stoichiometric Quantities to the equilibrium according to the above Do not move the equation to the side of the aluminate. there must be noted that leach also leached by the precipitation becomes. The liquor is preferably only once at the beginning of the process used, a subsequent However, it may be possible to add.

Preferably, the drying in the second step is carried out at a temperature in a range of about 400 ° C to about 650 ° C. At these temperatures, the deposited aluminum hydroxide forms γ-Al ₂ O ₃ , which has a high catalytically active surface and adheres very firmly to the coated component. Preferably, the drying is carried out at least two-step, wherein in a first substep, a predrying at a temperature of about 100 ° C to about 200 ° C. As a result, the aluminum hydroxide deposited on the component is first converted into crystalline aluminum hydroxide, which has the advantage that the resulting γ-Al ₂ O ₃ has high adhesion to the component as a result of the subsequent drying at higher temperatures in the second partial step. If it is desired to carry out the drying at higher temperatures in order, for example, to deposit α-Al ₂ O ₃ on the component or mixtures of α- and γ-Al ₂ O ₃ , then the temperature can be increased to above 700 ° C. Before the drying itself is still a drying of the coated component to the ambient air after removal of the coated component and flushing the same with particular water of different temperatures.

The specific surface area (BET) is then present in particular mixture of α-and γ.Al ₂ O ₃ at least about 20 m ² / g, preferably more than 50 m ² / g.

Optionally, a third drying step at temperatures of at least 800 ° C, preferably about 900 ° C or more, can be provided. The BET values are then preferably in a range of at least about 10 m ² / g, more preferably at least about 40 m ² / g.

The Drying at elevated Temperatures are preferably carried out in the absence of oxygen For example, in a nitrogen-hydrogen atmosphere (mixed gas atmosphere) or but under pure nitrogen or hydrogen, but also at the Air. At temperatures above 400 ° C a coating is obtained on the at least partially coated components, Which even after terms corresponding to 50,000 kilometers of road no Has aging phenomena.

Any necessary height The adhesion of the coating to the component is preferably achieved by preoxidizing the component before introducing the component into the coating apparatus, ie introducing it into the solution, for example by heating it to temperatures of up to 950.degree. In this way, an oxide layer on the surface of the component, as far as it is a metallic component is formed, whereby the surface roughness increases.

Around a high degree of uniformity the coating according to the inventive method To achieve, it is also advantageous that after addition of the liquor and introduction of the component in the coating device the solution is stirred. in principle it is advantageous if the component in the solution for at least 4 hours, preferably 8 hours, more preferably more than 16 hours, lingers before it's the solution is removed. As alkali and / or alkaline earth metal hydroxides are preferred Sodium hydroxide and potassium hydroxide used.

To Removal of the component from the solution is the coated component preferably also optionally also washed multiple times. The washing can in this case in particular with distilled Water done so far that a pH of the trapped Washing water of <8, preferably <7.5, measured becomes. By this washing of the freshly coated with aluminum hydroxides Components immediately after removal of the same from the solution finally after drying, including one Calcining a well-adherent coating with great active specific surface receive. The washing is preferably carried out with warm water with a temperature in the range of about 40 up to 50 ° C, in a second step, a wash with water in one Temperature range of about 15-25 ° C, and finally in a third step, a wash with hot water at a temperature in a range of about 60 to 70 ° C.

Catalytically active substances and / or stabilizing substances, in particular temperature-stabilizing substances, are preferably added to the solution, in particular if the component to be coated is to be used as catalyst. Catalytically active substances are catalyst components and compounds which, as reduction or oxidation catalysts, positively influence the conversion of the gaseous constituents contained in the exhaust gas of the internal combustion engine, for example SiO ₂ sols. The addition of such substances to the solution according to the method of the invention is referred to below as doping. In particular, such a doping with noble metals of the platinum group, in particular platinum, but also with oxides of rare earths is advantageous. Because this accelerates the oxidation of nitrogen monoxide to nitrogen dioxide, which is then subsequently available for the oxidation of the soot particles.

Further particularly advantageous catalyst components or compounds are those that the ignition temperature the soot particles reduce and thus the Rußabbrand promote. For example, vanadium-containing compounds such as silver, Lithium, sodium, potassium and cervanadate, vanadium pentoxide and / or Called potassium or silver perrhenate. But also such the degradation sulfur dioxide catalysing substances which ultimately Convert sulfur dioxide to sulfur dioxide, such as titanium dioxide and Silica, or their particular organo-metallic precursor forms, can the solution to be admitted. To obtain a temperature stability of a Catalyst can Furthermore, lanthanum, zirconium and cerium compounds may be added.

Furthermore, it is also possible, before or after the insertion of the component into the coating apparatus before or after a pre-oxidation of the same, to provide it with the above-mentioned solution with one of the abovementioned catalytically active or stabilizing components. It is particularly advantageous if after the calcination of the possibly doped coating, ie the formation of γ-Al ₂ O ₃ on the coated component, the coating is still provided with catalytically active substances. This can be done by impregnation by means of a sol-gel process, in particular for use with titaniferous sols or for the formation of zeolites. Here, the coated component in solutions, especially aqueous, containing the corresponding catalytic components, dipped and then removed from the solution, blown and then dried and optionally calcined. The impregnation can be done in addition to a doping, but also without a previous doping.

Preferably the coating can be by doping and / or impregnation with cerium, cerium copper and / or titanium salt solutions or platinum and / or rhodium solutions for Obtaining catalytic abilities or to obtain a temperature stability. As salts can in particular acetates of the aforementioned compounds used become. Catalytically active components or stabilizing components can in an amount of more than 3% by weight, preferably more than 8% by weight, further preferably more than 15% by weight, in each case based on the total amount the coating to be absorbed by this.

The present invention further relates a coated component produced according to the inventive method, and a catalyst, soot filter and / or a Rußfilterkatalysatoranordnung with at least one partially coated according to the inventive method component. Further applications of the coated components can be found for example in microreactors.

The Invention will be with reference to the following figures and the following Embodiment explained in more detail. It show in detail:

1 : An electron micrograph of a metal knit coated with the method according to the invention;

2 : a detailed view of the recording according to 1 ,

1 and 2 show electron micrographs of the coated metal knit, from which it is very clear that γ-Al ₂ O ₃ has deposited only directly on the metal knit forming threads and not on those in the existing between these cavities. As a result, the present invention coated te metal knit has a lower flow resistance than conventional coated metal knits known from the prior art.

Example:

On the one hand, a carrier body with flow guidelines (Emitec Gesellschaft für Emissionsstechnologie GmbH, Lohmar, Germany) of the "PM Kat" type having a flat dimension of 100 × 150 mm and a cell density of 200 cpsi (cells per square inch) was commonly used for catalysts. from the iron-based material according to the German material standard 1.4767, and on the other hand, a metal mesh of the same material with a surface dimension of 100 × 150 mm and a surface (geometrically determined) of about 10 m ² / m ² coated. Carrier bodies with cell densities of 900 cpsi and greater can be coated with the method according to the invention.

Either the carrier body as also the metal mesh, which as filter and / or catalyst elements can serve, were before the launch into the coater to temperatures of <900 g / C for formation of whiskers (surface oxides) heated.

Parallel this was an aluminate solution aluminum chips with a length in a range of about 100 m to 500 μm, prepared by scraping of chips from a metal block and subsequent coarse grinding of the same, and aqueous Sodium hydroxide in excess produced. The concentration of the aqueous sodium hydroxide solution was while about 4.8 g / l. Alternatively, it can also be provided that first Aluminum and / or aluminum alloys in multiply distilled Water introduced and only then sodium hydroxide or another Lye is added.

Subsequently was the component in the aluminate solution introduced, and then in turn added the above aluminum chips, so that aluminum in excess in the solution was present. In the process, aluminum hydroxide was formed from the aluminate solution The component deposited, which developed hydrogen at the same time. By the hydrogen and an extra provided emotion was the formation of a uniform coating supported on the component. The temperature of the solution during the coating was up to at the 10th hour less than 26 ° C, was increased from the 10th to the 20th hour to> 33 ° C, and subsequently lowered below 25 ° C until the 24th hour. Then you can the aforementioned method step are repeated, wherein simultaneously for example, the carrier in the coating apparatus can be turned to achieve a uniform coating. In this case, the component can be removed from the solution at short notice and also, if necessary Blowing used again in the solution become.

Subsequently, the solution is drained from the coating apparatus and the coated component is rinsed with multi-distilled water, wherein in a first step, a rinse with distilled water at a temperature of about 45 ° C, then a second rinse with distilled water at a temperature of about 20 ° C and subsequently a third rinse was carried out with distilled hot water at a temperature of 60 ° C. The specific surface area (BET) of the thus coated component was about 3 m ² / g.

Subsequently, the washed member was dried in ambient air for about 1 to 1 ½ days, then dried at 150 ° C for about 4 hours, and then calcined at a temperature in a range of about 500 to 600 ° C for 4 hours to form a coating γ-Al ₂ O ₃ .

The coated components had a high specific surface area of more than 180 m ² / g, which can have a very activating effect on catalyst components. At the same time, this coating adhered very firmly to the components. In a subsequent second drying at 900 ° C at 4 hours was α-Al ₂ O ₃ , or a mixture of α- and γ.Al ₂ O _3- The specific surface area (BET) was even more than 70 m ² / g.

Claims (14)

Process for the production of coatings Components, in particular catalysts and / or soot filters, with aluminum oxides, where - in a first step the Component is provided with an aluminum hydroxide-containing layer, wherein the coating with an aluminate-containing aqueous basic solution with the addition of aluminum and / or aluminum alloys in non-metallic stoichiometric Quantities in excess obtained, the temperature of the aluminum and / or aluminum alloy staggered solution up to about 40 ° C maximum is; and - in in a second step, the component coated with aluminum hydroxides to form an aluminum oxide-containing coating in the heat is dried. Method according to claim 1, characterized in that the ratio of the aluminum and / or the aluminum alloy to the liquor in the solution at least 2: 1. Method according to one the preceding claims, characterized in that in the first step, the component after Formation of an aluminate solution introduced into a coating device containing these and subsequently Aluminum and / or aluminum alloy is added. Method according to one of the preceding claims, characterized in that in the first step metallic aluminum in the form of powder, drops and / or chips is added. Method according to one of the preceding claims, characterized in that to form the aluminate sodium hydroxide solution is used. Method according to one of the preceding claims, characterized in that the concentration of the formation of the aluminate-containing solution used liquor is in a range of about 2 to about 12 g / l. Method according to one of the preceding claims, characterized in that the drying in the second step at a temperature in a range of about 400 ° C to about 650 ° C. Method according to one of the preceding claims, characterized in that the drying at least two-step takes place, wherein in a first substep predrying at a temperature in a range of about 100 ° C to about 200 ° C. Method according to one of the preceding claims, characterized in that the solution catalytically active substances and / or stabilizing substances are added. Method according to one of the preceding claims, characterized in that after drying of the component of this provided with catalytically active substances and / or stabilizing substances becomes. Coated component manufactured according to the method according to one of the claims 1 to 10. Catalyst with at least one partial with the Method according to one the claims 1 to 10 coated component. soot filter at least partially according to the method of the claims 1 to 10 coated component. Soot / catalyst assembly at least partially according to the method of the claims 1 to 10 coated component.