Catalyst body

 

(57) Abstract:

The invention relates to the field of catalysis. Catalyst body contains many of the streamline in the preferred direction of the channels. Each channel is perpendicular to the preferred direction approximately rectangular cross-section. Number of channels per unit area is in the range from 0.5 to 2.5 cm-2. The longitudinal sides of the first group of channels are approximately orthogonal to the longitudinal sides of the second group of channels. Channels in the combined group and the channels in each subgroup relative to their cross-sectional form approximately square location. The invention reduces the number of cracks in the catalyst during its manufacture and to improve the efficiency of the catalyst. 6 C.p. f-crystals, 3 ill.

The invention relates to a catalyst body, which contains many of the streamline in the preferred direction of the channels.

Catalysts are used, for example, to remove nitrogen oxides, hydrocarbons, carbon monoxide and/or dioxins from waste gas incinerators. Such catalysts can be in the form of cell catalysts. In the case of cell Kagami in the preferred direction of the fluid and/or gas, for example, the exhaust gas.

Such cell catalyst may be provided for the recovery or for the oxidation of harmful substances. Intended as DeNOx-catalyst cell catalyst, for example, restores the so-called SCR-method (method of selective catalytic reduction) adding a reducing oxides of nitrogen (NOx) in nitrogen (N2) and water (H2About). Known SCR activity, however, also has cell catalyst made as dioxindole catalyst. Dioxines catalyst oxidizes molecular oxygen, for example, polychlorinated dibenzodioxins/furans.

For catalytic cleaning of stationary or mobile installations for the incineration or combustion engines use cell catalysts, whose bodies have quadratic geometry of the channels. From DE 2819378 C2-known cell catalyst with continuous cells, which generally have a rectangular shape. Thus the longitudinal side of the first group of channels are approximately perpendicular to the longitudinal sides of the second group of channels. The number of channels may be at this 10/6,452 cm2. Also the application for ne structured body with a honeycomb body, channels which have an approximately rectangular cross-section, in addition, it is known in principle from the book "House of technology" professional other-ing. E. Shtajnmetts (publisher), publishing house of the Volcano Essen (1992), S. 23.

In such catalyst bodies there are, of course, the risk of mechanical blockage of cell holes chalk dust. To ensure reliable operation of the catalyst is therefore necessary regular, relatively time-consuming cleaning of the catalyst. Additionally, during the production of this catalyst bodies there is a problem that, due to its own tension catalyst bodies in the manufacturing process appears cracking.

The basis of the invention lies task is to specify catalyst body of the aforementioned type, which can very safely be operated at low cost for treatment. Also the cracks in the process of manufacturing a catalyst body should appear particularly rare.

This task is solved by the catalyst body of the aforementioned type, in which each channel is perpendicular to the preferred direction has an approximately rectangular cross-section defined longitudinal side and the more short the longitudinal side of the first group of channels are approximately perpendicular to the longitudinal sides of the second group of channels, and in which according to the invention, the channels in the combined group and the channels in each subgroup relative to their cross-sectional form approximately square location, and each subgroup is composed respectively of the channels of the same group.

The invention thus proceeds from the consideration that the catalyst body operates particularly reliably also at low cleaning costs if the risk of mechanical clogging of the channels is kept small. Also catalyst body, made for a particularly low risk of clogging of channels, must possess high catalytic activity. As it turned out, especially suitable for this purpose is the catalyst body, in which the number of channels per unit area is in the range from 0.5 to 2.5 cm-2preferably, from 0.9 to 1.6 cm-2and channels which have a virtually rectangular cross-sectional shape.

Measure the catalytic activity of the catalyst body is the so-called value AP. It is defined as the ratio of the geometric surface of the catalyst body to its spatial extent. With the same value up catalyst body, the channels which have approximately the selected edges, than the catalyst body, the cross section of the channels is approximately square. The lower is the number of channel edges, the less the tendency to mechanical blockage of the channels, so as fugitive dust is collected preferably in the area of the channel edges.

In order to keep their own voltage when the production of honeycomb catalyst bodies and the associated formation of cracks in the manufacturing process is particularly small, the preferred way of longitudinal side of the first group of channels are approximately orthogonal to the longitudinal sides of the second group of channels. In addition, the channels in subgroups, with each subgroup consists of channels of the same group. The channels of these subgroups with respect to their cross-sectional form approximately square location. Such subgroups allows particularly simple and flexible arrangement of the channels in the catalyst body. Neighboring subgroups may - depending on the feasibility is to be assigned to the first or second group of channels. In both cases, is especially stable overall structure. Such catalyst body can withstand relative to each external s form of execution of the invention subgroups combined in layers. Layers, which are alternately subgroups of the first and second channel groups, are particularly suitable, as each similarly performed layer is itself particularly insensitive to cracking in the manufacturing process.

In an alternative preferred form of execution of all channels of one layer belong to the same group of channels.

The preferred location of channels such catalyst body obtained due to the fact that belonging to the first and second group of channels, the layers are arranged alternately.

Catalyst body can be performed as a catalyst on the carrier in which the carrier is coated with a catalytically active layer. The preferred way, however, the catalyst body is made in a single piece of extruded products. In this case, the catalyst body consists exclusively of catalyst material. The solid extruded product may occur by using an extrusion machine, which produces molded products made of a soft plastic mass.

Freely available gas and/or liquid surface of each channel may preferably is of indena (YPA3from 5 to 20 wt.% and vanadium pentoxide (V2O5) less than 5 wt.%. Such catalyst body is preferably provided as DeNOx-catalyst.

Achieved by the advantages of the invention consist in particular in that the catalyst body, the channels which are perpendicular to the preferred direction approximately rectangular cross section, with the same AP value is less risk of mechanical clogging of channels than the catalyst body, the channels which have approximately square cross-section. Catalyst body, the number of channels which is in the range from 0.5 to 2.5 cm-2has a particularly high value AP and particularly low risk of mechanical clogging of the channels. Catalyst body, therefore, is particularly suitable for use on coal-fired power plants. Flue gas may have a load of chalk dust for high-grade coal from 6 to 20 grams per normal cubic meter, for deballasting, off-grade coal from 6 to 50 g per normal cubic meter. However due to the formation of sub-channels is especially simple orchestration volume catalizatorilor body is kept particularly small.

Examples of carrying out the invention are explained in more detail using the drawings, which show:

Fig.1 is schematically DeNOxcatalyst modular unit of the nine catalyst bodies,

Fig.2 - neckline catalyst body according to Fig.1 in cross-section in the first form of execution and

Fig.3 - neckline catalyst body according to Fig.1 in cross section a second form of execution.

DeNOxcatalyst modular unit 2 according to Fig.1 contains a lot of respectively the same type of catalyst bodies 4, which are placed in the housing 6. While DeNOxcatalyst modular unit may also contain more or less of the catalyst bodies 4, than it shows Fig.1. Each catalyst body 4 contains a number of channels 8, which are streamlined in a preferred direction 10 of the exhaust gas incinerators and are perpendicular to the preferred direction 10 is approximately rectangular cross-section. Each channel 8 limited longitudinal side 8A and shorter in comparison to the transverse side 8B.

The outer walls 14 and 16 of the respective catalyst body 4 are respectively a length of 150 mm Channels 8P>-2. Thus the number of channels 8 is in the range from 112 to 562 on the catalyst body 4. These channels 8 in the schematic drawing of Fig.1 is not shown, and only the target.

The catalyst body 4 are respectively in the form of a solid extruded product and contain materials titanium dioxide (TiO2) from 70 to 95 weight. % tungsten trioxide (WO3and/or molybdenum trioxide (Moo3from 5 to 20 weight. % and the vanadium pentoxide (V2O5) less than 5 wt.%. Alternative catalyst body 4 may also contain a carrier, which has a coating of the above materials.

Fig.2 and 3 show the neckline catalyst body 4 according to Fig.1 in cross-section in the first and second form of execution. In both forms of execution channels 8 is divided into the first group 20 and the second group 22. The 8 channels of the first group 20 are arranged in relation to their longitudinal sides 8A at right angles to the channels 8 of the second group 22. Groups 20, 22 channels 8 respectively contain subgroups 24. Subgroup 24 is formed from two adjacent channels 8 of the same group 20, 22. The channels 8 of these subgroups together in regard to their cross-section is approximately square location. Many subgroups 24, in St. Eremenko are subgroups 24 of the first group of 20 channels 8 and the second group 22 of the channels 8. The longitudinal sides 8A of each channel 8 respectively have a length 11,36 mm, their respective transverse side 8B - length 5,16 mm Number of channels 8 per unit area of each catalyst body 4 is of 1.28 cm-2. Thus, each catalyst body contains 288 channels and free streamlined cross section of 75% is set up equal to 423 m2/m3.

In the example of execution according to Fig.3 layer 26 is made exclusively from channel 8 one of the groups 20 or 22. Layers 26 are arranged alternately in such a way that adjacent layers 26 do not belong to the same group 20, 22 channels 8. The longitudinal sides 8A of each channel 8 catalyst body 4 according to Fig.3 have a length 11,59 mm, their respective transverse side 8B - length of 5.39 mm Each catalyst body 4 contains 288 channels. Thus the number of channels 8 per unit area is of 1.28 cm-2. In a free streamlined cross section of 80% of each catalyst body 4 is set up equal to 435 m2/m3.

Both examples perform the catalyst body 4 according to Fig.2 and 3 are of a particularly high value AP and particularly low risk of mechanical clogging of the channels 8. So pest from waste gas incinerators. When this catalyst body 4 are of a particularly high reliability when only small cleanup costs. In addition, due to the formation of sub-channels 8 are provided especially easy negotiating the terms of the respective catalyst body 4 with different geometric executions, and the manufacturing costs for a separate catalyst bodies 4 are supported particularly small.

1. Catalyst body with many streamlined in the preferred direction of the channels, each of which is perpendicular to the preferred direction approximately rectangular cross-section defined longitudinal side and shorter in comparison to the transverse side, and the number of channels per unit area is in the range from 0.5 to 2.5 cm-2and in which the longitudinal side of the first group of channels are approximately at right angles to the longitudinal sides of the second group of channels, wherein the channels in the combined group and the channels in each subgroup relative to their cross-sectional form approximately square location, and each sub-group is composed respectively of the channels of the same group.

2. Catalyst body under item 1, autocatalator body p. 1 or 2, characterized in that the subgroups form the layers, with each layer are alternately subgroups of the first group and second group.

4. Catalyst body under item 1 or 2, characterized in that the subgroups form the layers, all the channels of one layer belong to the same group of channels.

5. Catalyst body according to p. 4, characterized in that the layers belonging to the first group and the second group of channels are arranged alternately.

6. Catalyst body according to any one of paragraphs. 1-5, characterized in that it is made in the form of a solid extruded product and contains materials of titanium dioxide (TiO2) from 70 to 95 weight. % tungsten trioxide (WO3and/or molybdenum trioxide (Moo3from 5 to 20 weight. % and the vanadium pentoxide (V2O5) less than 5 weight. %.

7. Catalyst body according to any one of paragraphs. 1-6, characterized in that it is part of DeNOxcatalyst modular block.

 

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