GB2213073A - Air filter with catalytic filter bodies - Google Patents

Air filter with catalytic filter bodies Download PDF

Info

Publication number
GB2213073A
GB2213073A GB8825264A GB8825264A GB2213073A GB 2213073 A GB2213073 A GB 2213073A GB 8825264 A GB8825264 A GB 8825264A GB 8825264 A GB8825264 A GB 8825264A GB 2213073 A GB2213073 A GB 2213073A
Authority
GB
United Kingdom
Prior art keywords
filter
component
weight
bodies
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8825264A
Other versions
GB8825264D0 (en
Inventor
Paul J M Haufe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB8825264D0 publication Critical patent/GB8825264D0/en
Publication of GB2213073A publication Critical patent/GB2213073A/en
Withdrawn legal-status Critical Current

Links

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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8643—Removing mixtures of carbon monoxide or hydrocarbons and nitrogen oxides
    • B01D53/8646—Simultaneous elimination of the components
    • B01D53/8653—Simultaneous elimination of the components characterised by a specific device
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/889—Manganese, technetium or rhenium
    • B01J23/8892—Manganese
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H3/00—Other air-treating devices
    • B60H3/06—Filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H3/00—Other air-treating devices
    • B60H3/06—Filtering
    • B60H3/0658—Filter elements specially adapted for their arrangement in vehicles

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

0 -1 t - 1 AIR FILTER 2 2 13
BACKGROUND OF THE INVENTION
The invention relates to a filter for treating the air fed to the passenger compartment of a motor vehicle or the like.
The ventilating means in motor vehicles contain filters in the suction path of the air being fed to the vehicle cabin for filtering dust out of the air. considerable amounts of harmful substances are fed to the cabin during stop-and-go traffic and traffic jams so that generally the fresh air supply must be shut off. However, where harmful substances within the outside air are not directly evident, harmful substances do get into the passenger cabin in large amounts.
Filter cartridges are known for use in breathing apparatuses which not only filter the air mechanically but also treat it chemically by adding, for example, oxygen from an oxygen supply or removing C02 and steam therefrom.
However, such filters are used up relatively quickly and are therefore only satisfactory for emergency uses.
it is also known to reduce the emissions from internal combustion engines of carbon monoxide, nitrosic.gases (NOX) and non-combusted hydr6carbons (CH.) which are after-burned by using catalysts to convert them chemically into more stable and less harmful products. Such catalysts have a monolithic ceramic base structure which is coated with a precious metal. However, in view of their large block geometry, they are not very suitable for use in the vent means of a motor vehicle, the air conduits of which are very angled and which change drastically in their geometry from v 1 k, one vehicle to the next. Moreover, exhaust gas catalysts operate at very high gas temperatures which are not feasible for venting means in motor vehicles.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide a filter which is easily adaptable to receiving chambers having various geometries and which provide the advantages of a catalytic conversion of gas-like harmful substances into less harmful products. The air which is fed to the passenger cabin of a motor vehicle is also cleaned by using such a filter.
The filter employed in accordance with a preferred embodiment of the invention includes a plurality of filter bodies which support one or more catalysts and which, in at least two directions, have dimensions of a few millimeters to a few centimeters, respectively. In practice these dimensions may be between about 3 mm and 1-5 cm, for example. The dimensions of the filter bodies are chosen in such as manner that they may be employed as a fill within receiving chambers or filter cartridges without escaping therefrom through meshes, screens or lattice structures therein.
In view of the fact that the catalyst material is supported by the abovementioned bodies, one can usedifferent catalyst materials supported by different filter bodies which, under normal circumstances, would interfere with each other. However, when disposed on discrete bodies, t, 1 1 1 t only small contact points exist therebetween such that no impairment of the operations of the different catalyst materials would be expected.
A first advantage of the invention relates-to the very economical and efficient use of catalyst material in the manufacture of a filter.
Another advantage of the invention is that the individual filter bodies which support the catalyst material are easily constructed and treated by using finely ground, powder-like catalyst material which is applied to the surface thereof and provides a large effective surface.
If the base filter bodies are made from thermoplastic material, they cannot only be made very economically and in different geometrical configurations, but the base bodies can also be brought into a viscous state at the surface to insure the bonding of blown-on catalyst powder. The powder may be applied by simply providing a hot air flow including the catalyst powder, the temperature of the air being sufficiently high to bring the surfaces of the base filter bodies to a soft or molten state.
The surfaces of the filter are preferably corrugated and/or ribbed to provide large surface areas and to minimize the areas of contact with adjacent filter bodies. Several different configurations of filter bodies may be used in the same unit to further reduce the contact areas therebetween.
.In accordance with a further embodiment of the invention, mixtures of catalyst powders can be applied to individual filter bodies providing they do not interfere with the functioning of each other. The presence of particles of i different catalyst materials on the same filter body is sometimes advantageous since favorable synergistic effects may result between different catalyst materials. For example, a low exothermic reaction or a somewhat endothermic reaction may benefit from a strong exothermic reaction in its immediate vicinity.
in accordance with a still further embodiment of the invention, catalyst materials may be applied to a relatively large, open-pored base body such as polyurethane foam. The base body is formed in a mold which corresponds to the shape of a filter cartridge housing.
The invention will be described in terms of preferred embodiments with reference to the drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional side elevation view of a filter body according to the invention, including an enlarged sectional view of a portion thereof; Fig. 2 is a plan view of the filter body shown in Fig. 1; Fig. 3 is a sectional side elevation view of a filter body in iccordance with a.first alternative embodiment of the inventioni Fig. 4 is a sectional side elevation view of a filter body in accordance with a second alternative embodiment of 25 the invention; and Fig. 5 is a perspective view of an air filter for the venting means of a motor vehicle.
1.
is - 5 DETAILED DESCRIPTION OF THE INVENTION
In Figs. 1 and 2, a disc-like filter body 10 having a diameter of about I cm and a thickness of about 4 mm is shown. The diameter of such a body is preferably 1-5 cm, the thickness being about a few millimeters.
The filter body 10 includes a thermoplastic, injectionmolded base body 12 and fine particles 14 of a catalyst material partially imbedded into the surface of the base body. in practice, these particles 14 may have a core size of a few hundred microns. The catalyst material may promote the removal of such gases as CO, NOX, CH. and/or SCX from air.
The imbedding of particles 14 into the surfaces of the base bodies 12 is performed by bringing the surfaces of the base bodies into a softened, molten or viscous state by blowing or feeding a hot air stream therethrough while simultaneously blowing the particles 14 onto the surfaces. Preferably, this is performed by using a hot air stream to which the particles 14 are added. This hot air stream is fed to a rotating drum containing the base bodies 12. After recooling of the base bodies 12, the particles 14 are imbedded into the surfaces thereof.
As s ahown in Figs. 1 and 2, the base bodies 12 are provided with triangular, parallel corrugations 16 for enlarging the surface and the thickness of filter body 10 as viewed in cross section.
In order to prevent different filter bodies 10, when used as a filling with a chamber or filter cartridge, from making excessive surface contact with each other, ribs 18 are 1 provided which also have triangular cross sections and extLend vertically with respect to the corrugations 16, so that the base body 12 has a waffle-like structure. However, the ribs 18 have a somewhat lesser height than the corrugations 16, so that adjacent filter bodies 10 can somewhat align with respect to each other and hook up with each other, but passages parallel to the corrugations 16 still remain free.
The corrugations 16 together with the ribs 18 help to stiffen the base bodies 12, so that only a small wall thickness is required. This is advantageous with respect to providing a unit having relatively low weight. A low weight is generally desirable in the construction of motor vehicles. In addition, the low mass insures that the filter bodies when the vehicle is driven are subjected to only low shock stresses. Since the base bodies 12 are injection molded from plastic, they withstand shocks and vibrations very well. Such shocks and vibrations occur constantly during driving operations.
Face-to-face engagement of filter bodies 10 can also be minimized or prevented by mixing filter bodies of different geometries.
Fig. 3 illustrates a modified filter body 101 which is provided with wavelike or sinuous corrugations 161, so that excessive surface contact with filter bodies 10 is prevented even when the corrugations are separated by comparable distances.
Fig. 4 illustrates a further modified filter body 1011, wherein the corrugations 1611 are geometrically similar to the corrugations 16 of Fig. 1, but have a different separation.
1 7 Here too, face-to-face contacts between the filter bodies 1011 and the filter bodies 10, and between the filter bodies loll and the filter bodies 101, are prevented.
Fig. 5 illustrates a filter 20 for use in the venting means of a motor vehicle which is constructed from two cartridges 22, 24. The cartridges 22, 24 each have a housing 26 which is closed on its front and rear side with a lattice 28. The mesh width of lattice 28 is somewhat smaller than the diameters of the filter bodies 10,101 and 1011, so that the latter can be poured through an opening 30 in the upper wall of housing 26 into the interior thereof. After this filling of the housing, the opening 30 is permanently closed by a lid 32. An elastic, compressible layer 34 is provided between the lid and the surfaces of the filling. This layer 34 may be made from foam rubber which resiliently maintains the filling of discrete filter bodies under pressure.
I. The filter bodies 10 within cartridge 22 may be of the type which help convert gas-like harmful substances to other products which may be discharged from the cartridge 22 together with the air passing therethrough. The filter bodies within cartridge 24 may include different catalyst materials which generate solid products from harmful substances introduced therein, so that the filter bodies are used up during a given time. Such filter bodies are, for example, ones which convert SOX into elementary sulfur. Thus, the cartridge 24 can be replaced at certain time intervals, while the cartridge 22 may be used over long periods of time.
9_ - 8 Those skilled in the art will appreciate that the filter bodies 10 may be manufactured in a number of configurations, including spherical balls, wherein the coating of the surfaces thereof can be accomplished in the above-described manner. In a further modification of the invention, one can press the filter-material massive from catalyst material, whereby the blank should preferably be subjected to a sinter treatment to sinter the filter bodies together.
materials therefore statements
Example 1:
Example 2:
Example 3:
Example 4:
The following examples disclose mixtures of catalyst which are compatible with each other and which can be disposed on one filter body 10. All component are given in weight percent.
60% by we.ight Mn02 40% by weight CuO 80'. by Weight V2 05 20% by weight A920 15% by weight CUC12 85% by weight Fe2 03 5% by weight COM004 10% by weight Fe(M004)3 remainder: one B12 (M004) Example 5: 10% by weight Th02 80% by weight Zno 10% by weight A1203 Example 6,; 40% by weirht Cr203 60% by weight A1203 Example 7: 20% by weight coo 10% by weight Nio 70% by weight Fe203 Example 8: 33% by weight Fe2(MoO4)3 33% by weight CoM004 33% by weight Bi2(M004)3 Example 9: 80% by weight A1903 6.6% by weight si ' lver (Ag) 6.6% by weight platinum (Pt) 6.6% by weight rhodium (Rh) 1 1 20.
Further examples for catalyst materials for the filter bodies 10 are particles of alpha-aluminum oxide which are provided with a thin layer of precious metal on their surfaces. This surface coating may be performed, for example, by vaporizing in a vacuum, sputtering or the like.
Example 10: alpha-aluminum oxide vaporized with 1% by weight ruthenium (Ru).
Example 11: alpha-aluminum-axide vaporized with 2% by weight with the same weight components of metallic platinum (Pt) and rhodium (Rh).
Example 12: particles of alpha-aluminum oxide vaporized on the surface with two (weight) percent of platinum (Pt) and ruthenium (Ru) in equal components.
Further suitable catalyst materials for the filter bodies 10 comprise pure substances:
Example 13: Cr203 Example 14:
Ti3 (V04) 4 Example 15: Sb204 From the aforementioned filter bodies one can make combination filter materials by mixing different filter bodies with catalyst materials in accordance with the aforementioned examples 1-15. In the following some preferred examples for.such filter body mixtures are stated:
Example A: 1/3 filter body in accordance with example 1 1/3 filter body in accordance with example 2 1/3 filter body in accordance with example 3, Example B: 1/4 filter body in accordance with example 1 1/4 filter body in accordance with example 3 1/4 filter body in accordance with example 4 1/4 filter body in accordance with example 13 t -10 Example C: 1/4 filter body in accordance with example 1 1/4 filter body in accordance with example 4 1/4 filter body in accordance with example 5 1/4 filter body in accordance with example 13 Example D: 1/3 filter body in accordance with example 6 1/3 filter body in accordance with example 7 1/3 filter body in accordance with example 10 Example E: 1/3 filter body in accordance with example 8 1/3 filter body in accordance with example 10 1/3 filter body in accordance with example 11 Example F: 1/4 filter body in accordance with example 6 1/4 filter body in accordance with example 9 1/4 filter body in accordance with example 10 1/4 filter body in accordance with example 11 Example G: 1/4 filter body in accordance with example 2 1/4 filter body in accordance with example 4 1/4 filter body in accordance with example 8 1/4 filter body in accordance with example 12 Example H: 1/5 filter body in accordance with example 6 1/5 filter body in accordance with example 9 1/5 filter body in accordance with example 10 1/5 filter body in accordance with example 11 30 1/5 filter body in accordance with example 14 Example 1: 1/4 filter body in accordance with example 8 1/4 filter body in accordance with example 10 1/4 filter body in accordance with example 11 1/4 filter body in accordance with example 15 In a modification of the aforedescribed embodiments, one can make cartridges having filters which have different catalyst materials supported by a base body, from a monolithi- filter block which is then inserted into an outer housing similar to that shown in Fig. 5.
For example, such a monolithic filter block may be.made by foaming polyurethane in mold which corresponds to.the geometry of a cartridge housing. Such foam molds may be made relatively economically for complicated geometries, so that one can mount corresponding filter inserts in bends and in 1 A 11 segments of the air shafts of the venting means of the motor vehicle which may have irregular cross sectional configurations.
The catalyst material may be added to the plastic to be foamed before the foaming operation or during the foaming process (when pores are already formed, but when the plastic material is not yet solidified). If the open pore base body has very large pores, one may apply the coating after hardening of the plastic material by applying a suspension of lo the catalyst mixture or by immersing the base body into such a suspension.

Claims (58)

WHAT IS CLAIMED IS:
1. A filter for purifying air comprising:
plurality of filter bodies; catalytic material supported by said filter bodies; and means for supporting said filter bodies.
2. A filter as defined in claim 1 wherein each of said filter bodies has a diameter of between about one and five centimeters and a thickness of about a few millimeters.
3. A filter as defined in claim 2 wherein each of said filter bodies has a generally disc-like configuration.
4. A filter as defined in claim 1 wherein said supporting means includes a housing, said plurality of filter bodies comprising a fill within said housing.
5. A filter as defined in claim 4 wherein said housing includes an aperture including a lattice, the openings in said lattice being smaller than the sizes of said filter bodies...
6. A filter a defined in claim 4, wherein at least some of said filter bodies include corrugations in the surfaces thereof.
7. A filter as defined in claim 6 wherein at least some of said filter bodies include ribs extending between 1 said corrugations
8. A filter as defined in claim 1 wherein said filter bodies are made from thermoplastic material.
9. A filter as defined in claim 8 wherein said catalytic material is partially embedded within the surfac of said filter bodies.
10. A filter as defined in claim 9 wherein said catalytic material is embedded in the form of particles within the surfaces of said filter bodies by heating said filter bodies such that the surfaces thereof become molten and then introducing said catalyst material in powder form to said molten surfaces.
11. A filter as defined in claim 1 wherein said catalytic material is in the form of particles partially embedded within the surfaces of said filter bodies.
12. A filter as defined in claim 4 wherein said filter bodies have a plurality of different configurations to minimize face-to-face contact therebetween.
13. A filter as defined in claim 1 wherein at least some of said filter bodies include a plurality of different catalyst materials supported thereon.
1 I-
14. A filter as defined in claim 4 including means for resiliently applying pressure to said fill.
15. A filter as defined in claim 1 wherein said means for supporting said filter bodies includes first and second cartridges, said filter bodies being positioned within said first and second cartridges.
16. A filter as defined in claim 15 wherein said filter bodies within said first cartridge support different catalytic materials than said filter bodies within second 10 cartridge.
17. A filter as defined in claim 1 wherein at least one of said filter bodies includes a mixture of catalyst material components supported thereon which do not interfere with each other.
18. A filter as defined in claim 17, characterized in that the catalyst mixture contains Mn02 and CuO.
19. A filter as defined in claim 18, characterized in that the component Of Mn02 is about 60% by weight and the component of CuO is about 40% by weight.
20. A filter as defined in claim 17, characterized in that one mixture component is V205 and a second mixture component is A920.
T -1 I 1
21. A filter as defined in claim 20, characterized in that the component Of V205 is about 80% by weight and the component of A920 is about 20% by weight.
22. A filter as defined in claim 17, characterized in that one mixture the component is CUC12 and a second mixture component comprises Fe203.
23. A filter as defined in claim 22, characterized in that the component Of CuC12 is about 15% by weight and the component Of Fe203 is about 85% by weight.
24. A filter as defined in claim 17, characterized in that one mixture component is COM04, a second mixture component is Fe2 (14004)3, and a third mixture component is Bi2C4004)3
25. A filter as defined in claim 24, characterized in that the component Of COM04 is about 5% by weight and the component of Fe2 (1404)3 is about 10% by weight and the remainder component is Bi2WO04)3
26. A filter as defined in claim 17, characterized in that one of the mixture components is Th02, a second Of the 20 mixture components is Zno and a third mixture component is A1203 16 -
27. A filter as defined in claim 26, characterized in that the component of Th02 is about 10% by weight, the component of ZnO is about 80% by weight and the component of A1203 is about 10% by weight.
28. A filter as defined in claim 17, characterized in that one of the mixture components is Cr203 and a second of the mixture components is A1203,
29. A filter as defined in claim 28, characterized in that the component of Cr203 is about 40% by weight and the component of A1203 is about 60% by weight.
30. A filter as defined in claim 17, characterized in that one mixture component is Coo, a second of the mixture components is NiO and a third mixture component is Fe203
31. A filter as defined in claim 30, characterized in that the mixture component is Coo is about 20% by weight, the component of NiO is about 10% by weight and the component of Fe.-03 is about 70% by weight.
32. A filter as defined in claim 17, characterized in that one of the mixture components comprises alpha-A1203 which is vaporized on the surface with Ru.
33. A filter as defined in claim 32, characterized in that the component of Ru is about 1% by weight.
Y lk 3 "1;.
1
34. A filter as defined in claim 17, characterized in that one of the components is alpha-A1203 which an the surface is vaporized with Pt and Rh.
35. A filter as defined in claim 34, characterized in 5 that Pt and Rh are vaporized in equal percents by weight.
36. A filter as defined in claim 34, characterized in that the total component of Pt and Rh is about 2 percent by weight.
37. A filter as defined in claim 17, characterized in lo that one of the mixture components is alpha-A1203, a second mixture component is.g, and a third mixture component is Pt and a fourth mixture component is Rh.
38. A filter as defined in claim 37, characterized in that component of alpha-A1203 is about 80% by weight.
39. A filter as defined in claim 38, characterized in that the weight components of Ag,Pt,Rh are about equal.
40. A filter as defined in claim.17, characterized in that one of the mixture components comprises alpha-A1203, which is vaporized on its surface with Pt and Ru.
41. A filter as defined in claim 40, characterized in that the weight components of Pt and Ru are about equal.
i- i
42. A filter as defined in claim 41, characterized in that the total component of weight of the Pt and Ru is about 2%.
43. A filter as defined in claim 1, characterized in that the catalyst material includes Cr203.
44. A filter as defined in claim 1, characterized in that the catalyst material includes Ti3(V04)4.
45. A filter as defined in claim 1, characterized in that the catalyst material includes Sb204.
46. A filter as defined in claim 2 wherein said filter bodies are f ormed from catalyst material.
47. A filter as defined in claim 46 wherein said filter bodies are sintered together.
48. A filter body comprising a thermoplastic base body having an irregular surface, said base body having, in at least two directions, dimensions of about one to five cm. and about three mm, respectively, and particles of catalyst material embedded within said surface of said base body.
49. A filter body as defined in claim 48 wherein said base body has a disc-like configuration.
3 1 k_
50. A filter body as defined in claim 48 wherein said particles are embedded within said surface of said base body by heating said base body such that the surface thereof becomes molten and then introducing said particles in powder 5 form to said molten surface.
51. A filter as defined in claim 48 wherein said surface of said base body has particles of different catalyst materials embedded therein.
52. A filter comprising:
A porous, monolithic, plastic substrate made by foaming a plastic material within a mold; and catalyst material supported by said substrate, said catalyst material being suitable for purifying air.
53. A filter as defined in claim 52 wherein said catalyst material is added to said plastic material before or during the foaming, thereof, thereby embedding said catalyst material within said plastic substrate.
54. A filter as defined in claim 52 wherein said plastic material is polyurethane.
- 1
55. A method of manufacturing a filter comprising: injection molding a plurality of thermoplastic filter bodies; heating the surfaces of said filter bodies toA substantially molten state; introducing particles of catalyst material to said surfaces while in said molten state, said particles becoming embedded within said surfaces; and inserting said filter bodies within a filter housing.
56. A method as defined in claim 55 wherein said particles are introduced to said filter bodies by means of a hot air stream passed therethrough, said hot. air stream heating said surfaces'of said filter bodies 'to a substantially molten state.
57. A method as-defined in claim 56 including the steps of rotating said filter bodies in a drum, and feeding said hot air stream including said particles'into said drum.
58. A filter as substantially hereinbefore defined with refexence to and as illustrated in the accompanying drawings.
Published 1989 atTliePatentOffice, State House, 66"71 High HOlbOM,I, 0ndonWC1R4TP. Further coplesmay be obtainedfrom The p&tentoface. Sales Branch, St Maxy Cray, Orpington. Kent BRB 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent, Con. 1187 1 t J
GB8825264A 1987-11-26 1988-10-28 Air filter with catalytic filter bodies Withdrawn GB2213073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873740091 DE3740091A1 (en) 1987-11-26 1987-11-26 FILTER MATERIAL

Publications (2)

Publication Number Publication Date
GB8825264D0 GB8825264D0 (en) 1988-11-30
GB2213073A true GB2213073A (en) 1989-08-09

Family

ID=6341331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8825264A Withdrawn GB2213073A (en) 1987-11-26 1988-10-28 Air filter with catalytic filter bodies

Country Status (5)

Country Link
JP (1) JPH01258713A (en)
DE (1) DE3740091A1 (en)
FR (1) FR2623727A1 (en)
GB (1) GB2213073A (en)
IT (1) IT1227926B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8758460B2 (en) 1999-02-08 2014-06-24 Johnson Matthey Public Limited Company Catalyst composition
US10792647B2 (en) 2009-04-21 2020-10-06 Johnson Matthey Public Limited Company Base metal catalysts for the oxidation of carbon monoxide and volatile organic compounds

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5181995A (en) * 1990-10-01 1993-01-26 Ford Motor Company Electrochemical process and apparatus for reducing oxidants of vehicle interior air
DE4134222C2 (en) * 1991-10-16 2002-09-19 Mhb Filtration Gmbh & Co Kg Filters for passenger compartments
US5350443B2 (en) * 1993-04-19 1999-08-10 Von Hasso Bluecher Filter sheet material for passenger cabins in motor vehicles
DE19915534C2 (en) * 1999-04-07 2003-12-04 Joerg Brandes Device for reducing the concentration of colony-forming units in the interior of cars
DE102023106962A1 (en) 2023-03-20 2024-09-26 Mann+Hummel Gmbh Indoor air conditioning device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB913449A (en) * 1960-02-08 1962-12-19 American Cyanamid Co Catalyst composition and use thereof
GB1382820A (en) * 1970-12-24 1975-02-05 Draegerwerk Ag Air filterin apparauts
US4018568A (en) * 1976-02-09 1977-04-19 Uop Inc. Fume absorbing-treating system
GB1557708A (en) * 1975-06-24 1979-12-12 Sanchez Torres S Catalytic converter
EP0123566B1 (en) * 1983-01-26 1988-06-08 COMPAGNIE FRANCAISE DE PRODUITS OXYGENES Société anonyme Process for producing sterile air for medical use, and apparatus for carrying out this process

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2030835A1 (en) * 1970-06-23 1972-01-05 Collo-Rheincollodium Köln GmbH, Werk Hersei, 5304 Hersei Filters for removing gases, vapors and the like from the air and a process for its manufacture
DE2134587A1 (en) * 1971-07-10 1973-01-25 Collo Rheincollodium Koeln Gmb Air filter - consisting of particles of foam material with open pores mixed with absorbent substances and/or redox catalyst
DE2329645A1 (en) * 1973-06-09 1975-01-09 Collo Rheincollodium Koeln Gmb Filtering granules for eliminating unpleasant odours - containing acidic or basic chemisorption material and moisture absorbent
DE2422574A1 (en) * 1974-05-09 1975-11-20 Collo Gmbh Filtering granules for eliminating unpleasant odours - containing acidic or basic chemisorption material and moisture absorbent
GB1586398A (en) * 1977-07-15 1981-03-18 Gen Motors Corp Pellet type oxidation catalyst
DE2804154C2 (en) * 1978-01-31 1984-04-19 Blücher, Hasso von, 4000 Düsseldorf Filter material and method and device for its manufacture
DE2817176C2 (en) * 1978-04-20 1982-02-04 Fa. Hermann Wegener, 3000 Hannover Process for the production of a filter material with a large specific surface
DE3228156C2 (en) * 1982-07-28 1994-01-20 Bluecher Hubert Use of a flexible surface filter in an air cleaning device for motor vehicle cabins
DE3325712C2 (en) * 1983-07-16 1987-03-12 Stettner & Co, 8560 Lauf Catalytic converter for the afterburning of flue gases
DE3347086A1 (en) * 1983-12-24 1985-07-04 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co. KG, 7000 Stuttgart MATRIX FOR A CATALYTIC REACTOR FOR EXHAUST GAS PURIFICATION

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB913449A (en) * 1960-02-08 1962-12-19 American Cyanamid Co Catalyst composition and use thereof
GB1382820A (en) * 1970-12-24 1975-02-05 Draegerwerk Ag Air filterin apparauts
GB1557708A (en) * 1975-06-24 1979-12-12 Sanchez Torres S Catalytic converter
US4018568A (en) * 1976-02-09 1977-04-19 Uop Inc. Fume absorbing-treating system
EP0123566B1 (en) * 1983-01-26 1988-06-08 COMPAGNIE FRANCAISE DE PRODUITS OXYGENES Société anonyme Process for producing sterile air for medical use, and apparatus for carrying out this process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8758460B2 (en) 1999-02-08 2014-06-24 Johnson Matthey Public Limited Company Catalyst composition
US10792647B2 (en) 2009-04-21 2020-10-06 Johnson Matthey Public Limited Company Base metal catalysts for the oxidation of carbon monoxide and volatile organic compounds

Also Published As

Publication number Publication date
GB8825264D0 (en) 1988-11-30
FR2623727A1 (en) 1989-06-02
JPH01258713A (en) 1989-10-16
IT8822729A0 (en) 1988-11-25
DE3740091A1 (en) 1989-06-15
IT1227926B (en) 1991-05-14

Similar Documents

Publication Publication Date Title
EP1113163B1 (en) Fuel vapor treatment canister
EP0038224B1 (en) Composite material for ozone removal
US4774217A (en) Catalytic structure for cleaning exhaust gas
US8062604B2 (en) Filter element
EP1283067B1 (en) Honeycomb filter for purifying exhaust gas
US3883637A (en) Catalytic method of purification of air for motor vehicle passenger compartment
WO2003035219A2 (en) Adsorption element and methods
GB2070957A (en) Catalytic device for purification of exhaust gas
JP3036779B2 (en) Process for producing carriers for filters or catalysts
GB2213073A (en) Air filter with catalytic filter bodies
JP3337398B2 (en) Adsorbent for evaporative fuel processing apparatus and method for producing the same
JPH05305213A (en) Air purifying sheet and air purifying filter using the same
JPH02108717U (en)
US4360957A (en) Method for fabricating an exhaust gas treating unit
DE3819002A1 (en) Air filter for passenger cells
JP2001096112A5 (en)
JPH11128667A (en) Deodorization filter
US3713782A (en) Method for insertion of particulate catalytic material in a catalytic converter housing
JPH0217209B2 (en)
JPS62149317A (en) Porous ceramic structural body and its production
JP4321127B2 (en) GAS PURIFICATION DEVICE, GAS PURIFICATION MATERIAL, AND METHOD FOR PRODUCING GAS PURIFICATION MATERIAL
JPS56126433A (en) Purifying body for waste gas
RU2036698C1 (en) Absorbing filtering material and method of its production, method of separation of gases from radioactive substances
CA2010754C (en) Catalytic converter/muffler
KR830001883B1 (en) Exhaust gas purification structure

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)