DE8511092U1 - Catalytic converter - Google Patents

Description

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The invention relates to an exhaust gas catalytic converter, in particular for combustion exhaust gases of motor vehicle internal combustion engines, with a housing and a catalyst core arranged in the housing, through which the exhaust gases flow, wherein the catalyst core consists of a carrier with a very large surface and a coating of a catalyst material applied to the surface of the carrier, in particular from a lacquer-like catalyst material.

Catalytic converters have long been known from practice. Catalytic converters for combustion exhaust gases from motor vehicle internal combustion engines are used to remove pollutants in the combustion exhaust gases in the presence of catalyst material to harmless substances, in particular to carbon dioxide and water to burn. The most commonly used catalytic converters for automotive internal combustion engines have a KatalySatorkern with a carrier Aluminum oxide in the form of bulk material or in the form of a honeycomb tube, on the surface of which a coating of platinum or palladium is applied is. For these most common catalytic converters, the optimal air ratio is regulated by a so-called lambda probe, so that the catalytic Post-combustion can run optimally. Instead of the extraordinary Expensive platinum or palladium coatings have recently become lacquer-like Coatings became known.

In the previously known carriers made of porous ceramic material, in particular made of aluminum oxide, there is the problem, especially with the new paint-like coatings, that the coating is in the exhaust gas flow from The carrier dissolves and is blown out of the catalytic converter. This is a particular problem because of that required in catalytic post-combustion honing exhaust gas temperatures of several hundred degrees Celsius. in the Otherwise, the catalyst cores of the known catalytic converters are also very expensive to manufacture because of the construction of the supports.

Based on the prior art explained above, the invention is the Task is based on designing the known catalytic converter and continuing

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zubilden that with the simplest possible structure and one possible simple production makes it difficult or impossible to detach the coating from the carrier.

The exhaust gas catalytic converter according to the invention, in which the previously indicated task is solved, is characterized in that the carrier of the catalyst core of thin plate-shaped parts with large-pored, rough surfaces, made of anodized aluminum with large-pored, rough surfaces or made of open-pored sintered glass. According to the invention it has been recognized that the large-pored, rough surfaces correspondingly designed plate-shaped Parts, the large-pored, rough surfaces of anodized aluminum or open-pored sintered glass are an ideal primer for a Coating with catalyst material, in particular with lacquer-like catalyst material Offer. In addition, and this is of particular importance for the teaching of the invention, the catalyst core of the invention Build up the exhaust gas catalytic converter in a particularly simple manner, so that extremely simple manufacture is ensured.

Structure, manufacture and properties of open-pored sintered glass, which is used for the exhaust gas catalytic converter according to the invention is suitable, results from the company publication of the company Schott Glaswerke, preliminary product information No. 9024 d "Open-pored sintered glasses". The disclosure content of this pre-published This document is hereby expressly made part of the disclosure content of the invention.

Further particularly advantageous refinements and developments of the teaching of the invention are dealt with below in connection with the explanation of preferred exemplary embodiments with reference to the drawing. In the drawing shows

1 is a very schematic perspective view of a first exemplary embodiment of an exhaust gas catalytic converter according to the invention,

FIG. 2 shows a second exemplary embodiment in a representation corresponding to FIG. 1 a catalytic converter according to the invention,

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5 shows a section of the catalyst core in a greatly enlarged illustration a catalytic converter according to the invention and

4 shows an SEM image of an open-pored sintered glass as a component of a further embodiment of a catalytic converter according to the invention.

The catalytic converter shown in FIG. 1 is a Exhaust gas catalytic converter for combustion exhaust gases from motor vehicle internal combustion engines, which initially has a housing 1 and one arranged in the housing 1 and from has the catalyst core 2 through which the exhaust gases flow. In detail, the catalyst core consists of a carrier, which is only indicated in FIG large surface and a coating of a catalyst material applied to the surface of the carrier. As coatings are so far primarily known as platinum and palladium; recently, lacquer-like coatings have also been widely promoted. In Fig. 1 is finally indicated by the grid-like structure that the catalyst core 2 can of course be flowed through by the exhaust gases.

The exhaust gas catalytic converter shown schematically in FIG. 1 is now distinguished initially characterized in that the carrier of the catalyst core 2 of thin plate-shaped Parts 3 is formed with large-pored, rough surfaces. The ,. plate-like parts 3 which form the support of the catalyst core 2 are as metal sheets, here namely as anodically oxidized aluminum sheets. These anodically oxidized aluminum sheets have a raw surface, namely, according to the preferred teaching of the invention, they are a hot water aftertreatment not been subjected. This achieves the desired, large-pored, rough surface of the carrier. This surface structure offers one ideal primer for the coating of a catalyst material, in particular when a lacquer-like coating is used. This coating adheres so firmly to the carrier that the catalyst material is blown out from the catalytic converter is impossible. In addition, the anodized aluminum sheets withstand the catalytic afterburning occurring high temperatures of several hundred degrees Celsius.

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Fig. 1 makes it readily clear that in the embodiment of a catalytic converter shown here, the plate-shaped parts 3 ζϊ are stacked one on top of the other. By having the same widths, these plate-shaped parts 3 form a cuboid catalyst core 2. In contrast to this, the stacked plate-shaped parts 3 in the embodiment according to FIG gradually

, ₍ A circular cylindrical shape of the catalyst core could also be achieved by the fact that the plate-shaped parts or a correspondingly thin plate-

! · Shaped part, for example also an aluminum sheet, wound into a · roll are or is.

Fig. 3 leaves the structural design of what is provided according to the invention Catalyst core 2 with plate-shaped parts 3 in the form of anodized aluminum sheets can be seen more clearly. It can be clearly seen that between the plate-shaped parts 3 spacers 4 to form flow channels 5 for the exhaust gases are arranged. Of course, the plate-shaped parts 3 could also be arranged at a distance from one another in the housing 1 in some other way be that the functionally necessary flow channels for the exhaust gases arise. Of course, these flow channels do not have to be designed continuously rather, they can also run in a meander shape.

In the embodiment shown in Fig. 3 are in manufacturing technology particularly expediently, the spacers 4 as embossed beads ι the plate-shaped parts 3, d. H. in the aluminum sheets. This corresponds to a particularly preferred embodiment of the invention Catalytic converter. Instead of beads, of course, grooves or rather point-like knobs can also be formed in the plate-shaped parts.

Fig. 4 shows an SEM image of an open-pored sintered glass 6, which is also, and particularly well, as a support for the catalyst core 2 of one according to the invention Can serve catalytic converter.

Claims (9)

y'pf \ Roh £ ". ·; '.]' Protection claims: 1. Exhaust gas catalytic converter, in particular for combustion exhaust gases from internal combustion engines of motor vehicles, with a housing and a catalyst core arranged in the housing, through which the exhaust gases flow, the catalyst core from a support with a very large surface and a coating of a catalyst material, in particular, applied to the surface of the support consists of a lacquer-like catalyst material, thereby characterized in that the support of the catalyst core (2) of - 'Thin plate-shaped parts (3) with large-pored, rough surfaces anodically oxidized aluminum with large-pored, rough surfaces or from open-pored sintered glass (6) is formed. 2. Catalytic converter according to claim 1, characterized in that the plate-shaped Parts (3) are designed as metal sheets, in particular as anodically oxidized aluminum sheets. 3. Catalytic converter according to claim 1 or 2, characterized in that the plate-shaped parts (3) are stacked one on top of the other. 4. Catalytic converter according to claim 3, characterized in that the to A stack of plate-shaped parts (3) stacked on top of one another to form a cuboid catalyst core (2) through equal widths. 5. Catalytic converter according to claim 3, characterized in that the to one Stack of stacked plate-shaped parts (3) with overall widths decreasing from the inner to the outer plate-shaped parts (3) form a circular cylindrical catalyst core (2). 6. Catalytic converter according to claim 3, characterized in that a plate-shaped Part or several plate-shaped parts is wound into a roll or are. G ^ stjnii / sert &. jvprj raw r '. · 7. exhaust gas catalytic converter according to one of claims 1 to 6, characterized in that that spacers (4) are provided to form flow channels (5) for the exhaust gases. 8. Catalytic converter according to claim 7, characterized in that the spacers (4) are formed as embossed beads, grooves or knobs in the plate-shaped parts (3). 9. Catalytic converter according to one of claims 1 to 8, wöbe? the carrier of the The catalyst core consists of anodically oxidized aluminum, characterized in that that the surface of the support of the catalyst core (2) is left raw, that is, it is not subjected to a hot water aftertreatment. • t f I · ·