US20040067175A1 - Ceramic filter element and method for production thereof - Google Patents

Ceramic filter element and method for production thereof Download PDF

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Publication number
US20040067175A1
US20040067175A1 US10/332,582 US33258203A US2004067175A1 US 20040067175 A1 US20040067175 A1 US 20040067175A1 US 33258203 A US33258203 A US 33258203A US 2004067175 A1 US2004067175 A1 US 2004067175A1
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US
United States
Prior art keywords
catalyst
support
filter element
catalyst material
bonding
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.)
Abandoned
Application number
US10/332,582
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English (en)
Inventor
Steffen Heidenreich
Max-Eckhard Rossler
Astrid Walch
Manfred Gutmann
Sven Chudzinski
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.)
Pall Corp
Original Assignee
Steffen Heidenreich
Max-Eckhard Rossler
Astrid Walch
Manfred Gutmann
Sven Chudzinski
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 Steffen Heidenreich, Max-Eckhard Rossler, Astrid Walch, Manfred Gutmann, Sven Chudzinski filed Critical Steffen Heidenreich
Publication of US20040067175A1 publication Critical patent/US20040067175A1/en
Priority to US11/544,586 priority Critical patent/US20070031304A1/en
Priority to US12/946,889 priority patent/US8388898B2/en
Assigned to PALL CORPORATION reassignment PALL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HEIDENREICH, STEFFEN, WALCH, ASTRID
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2407—Filter candles
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/0212—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters with one or more perforated tubes surrounded by filtering material, e.g. filter candles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/06—Details of supporting structures for filtering material, e.g. cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2273/20—High temperature filtration

Definitions

  • the invention relates to a ceramic filter element, in particular a filter candle or filter tube, in accordance with the preamble to Patent claims 1 and 15 , as well as a filter candle or filter tube in accordance with the preamble to Patent claim 28 .
  • the invention also relates to a method for the manufacture of such filter elements.
  • the reduction of nitrous oxides from gases is carried out by selective reaction of the nitrous oxides with the reduction media in solid catalytic converters.
  • solid catalytic converters In order for an adequate catalytic activity to be attained, and in order to exclude the depositing of salt on the surface of the catalyst, so leading to its deactivation, correspondingly high gas temperatures are required.
  • reduction catalytic converters are used for waste gas purification in power stations in the waste gas flow between the boiler and the air pre-heater at temperatures of some 300° C. to 350° C.
  • the ceramic catalyst material is in this situation arranged in most cases in the form of rigid plates or honeycomb bodies, but in part also in the form of bulk deposit layers.
  • the gases containing nitrous oxides are mixed with the reaction medium and that the mixture is conducted through at least one filter element having catalytic effect, which consists of a ceramic carrier material and the catalytic effect substances.
  • the catalytic effect filter element is also used for extracting dust from the gases containing nitrous oxides.
  • the filter element consists either of felts or non-woven fleece materials, which are manufactured from fibres of the ceramic carrier material by compaction and have been doped with the catalytic effect substances, or of porous sinter bodies, which are manufactured from granules of the ceramic carrier material by sintering and have been doped with the catalytic effect substances.
  • the filter element may exhibit the form of a filter candle or filter element.
  • the doping of the ceramic carrier material in the catalytic effect substances is effected by these substances being applied onto the ceramic carrier material before, during, or after the manufacture of the felts, non-woven fleeces, or sinter bodies. This can be done, for example, by impregnating the filter elements with salt solution and subsequent heating of the filter elements doped with the salts.
  • a filter device for gas purification which exhibits a single tubular body made of heat-resistant foam ceramics, which simultaneously has the effect of a dust filter and, with the appropriate coating, as a catalytic converter.
  • EP 0 470 659 a method is described for the separation of dust and organic compounds from oxygen-containing gases, in particular from combustion waste gases.
  • the waste gas which is to be purified is conducted through at least one filter element functioning as a catalytic converter, which is composed of a ceramic carrier material and the substances functioning as catalysts.
  • the filter element may consist of a porous sinter body, which is manufactured from granules of ceramic carrier material by sintering and has been doped with the catalytically effective substances.
  • WO 9012950 describes a Diesel soot filter, which consists of honeycomb bodies, of which the first honeycomb body is provided with a first surface layer which, in an inherently known manner, has the effect of catalytically converting the nitrous oxides and carbon monoxide into nitrogen or carbon dioxide respectively, while the second honeycomb bodies are provided with a second surface layer and in an inherently known manner catalytically cause a reduction of the ignition temperature of the soot adhering here.
  • a gas purification device in the form of a filter candle is known.
  • the filter candle exhibits on the outside a membrane layer of ultra-fine silicon carbide particles, in order to filter out dust particles.
  • a catalytically effective layer of sintered silicon carbide powder follows in the direction of flow inwards.
  • As the catalytic converter a vanadium-titanium compound is provided for, with which the silicon carbide filter is impregnated.
  • the filter candle is created by a subsequent coating of a porous element, which has the disadvantage that the porous layer cannot be applied entirely uniformly in the pore area, and therefore the distribution of the catalyst material is not homogenous.
  • there is the problem of the adherence of the applied layer to the silicon carbide particles whereby an added difficulty is that, in the area of the hot-gas filtration, temperature fluctuation stresses occur, which can encourage the separation of the coating.
  • the distance between the support material particles is greater than with filter elements with which the support material particles are first sintered and the bonding/catalyst materials are then introduced.
  • the bonding/catalyst materials form for preference web-type connections between the support material particles, whereby free spaces remain between the webs to allow the passage of the gas which is to be filtered.
  • per volume unit there is more catalyst material available in the filter element, as a result of which the degree of efficiency of the filter element is additionally increased in comparison with conventional filter elements.
  • the degree of efficiency of the filter element is further increased by the fact that the bonding material exhibits either catalyst material or is partly replaced by catalyst material.
  • the catalyst material simultaneously takes on a bonding function for the support material particles, so that it is possible to do without a pure bonding material in whole or in part.
  • the catalyst material can be increased to the degree to which the bonding material is reduced.
  • the catalyst and bonding materials are present as composite particles. These composite particles can consist of 90 to 99% by weight of catalyst material and the remainder of bonding material.
  • the catalyst material is already incorporated at the time of manufacture of the ceramic filter element, as a result of which a homogenous distribution of the catalyst material in the filter element is attained. As a result, the degree of efficiency of the filter element is likewise increased in comparison with conventional ceramic filter elements.
  • the catalyst material consists of oxides of the rare earths, of aluminates, of silicates, of titanates, or of titanium dioxide, or, for special preference, of calcium aluminate.
  • one substance of the substances cited may be concerned, or mixtures of several substances, each from one of the substance classes named, or mixtures of substances from several of the substance classes named.
  • aluminates, titanates, or titanium dioxide is used, if the bonding material is entirely replaced by the catalyst material.
  • Other catalyst materials are likewise suitable.
  • bonding material conventional materials are used, such as, for example, kaolin, flux agents, or clay.
  • an adherence agent to be added to the catalyst material in turn, which consists for preference of a flux.
  • the catalyst material is modified with promoters, or, if the catalyst material consists of a mixture of substances of the substance classes referred to heretofore, at least one of these substances is modified with promoters.
  • support material for the support bodies the known materials SiC, mullite, or aluminium oxide are used.
  • the proportion of the support material amounts to 60 to 90% by weight and that of the catalyst/bonding material 10 to 40 % by weight.
  • the proportion of the support material is about 65 to 75% by weight, and that of the catalyst bonding material 25 to 35 % by weight.
  • the support material may consist of SiC or Al 2 O 3 , and the catalyst bonding material of clay-earth element (calcium aluminate) and clay.
  • the catalyst material is located only in the second layer of the filter element.
  • the method for the manufacture of such a filter element in which the support body is manufactured first and then the layer for the particle separation is applied onto the support body, is characterised in that the bonding material is mixed fine-grained and homogenously with the catalyst material in each case, that this mixture is then mixed with the support material, and that this resultant mixture is then introduced into a mould for the manufacture of the support body and sintered.
  • a further variant of the manufacturing method makes provision for composite particles to be manufactured from bonding material and catalyst material, and that these composite particles are then mixed with the support material. To manufacture the support body, the resultant mixture is introduced into the mould and sintered.
  • a further embodiment makes provision for at least one source material in powder form or at least one source material present in a solution, which under the effects of heat form catalyst and/or bonding properties, being mixed with the support material, and that the resultant mixture is placed in a mould and sintered for the manufacture of the support body.
  • powder-form source materials for example, calcium oxide and aluminium oxide are well-suited, from which calcium aluminate is formed.
  • the catalyst material is formed during the sintering of the filter element by chemical reactions.
  • These source materials may contain both substances from which the catalyst material forms, as well as the bonding material.
  • the support material particles do not sinter with one another. Only by the sintering of the bonding and/or catalyst material, in particular of the bonding particles, will the holding effect of the support material particles be achieved.
  • the problem is resolved by a ceramic filter element which is characterised in that the support material is replaced at least in part by the catalyst material.
  • the catalyst material consists of one or several aluminates, of one or several titanates, or of titanium dioxide.
  • the catalyst material consists of one or more oxides or mixed oxides of the rare earths, with which the support material grains are coated.
  • the catalyst material consists of a mixture of at least one oxide or mixed oxide of the rare earths and at least one aluminate, a titanate, or titanium oxide.
  • Support material and catalyst material are used jointly for the manufacture of the support body, whereby both materials are present in fine-grain form and are mixed.
  • the coating according to method step b) is carried out for preference by means of the sol-gel method.
  • the support material grains can be sprayed with the sol in a mixer.
  • the advantage of this method lies in the fact that the excellent thermal shock resistance of silicon carbide, which is used for preference for the support material, is exploited, and an economical and uniform coating of the original grain is achieved before the burning of the filter element with catalyst. It is likewise of advantage, if selecting method step b), for the coating to be carried out by spraying on the ceramic mud. This is done for preference by the support material grains being sprayed with the ceramic mud in a mixer.
  • step c for preference two grain fractions are used, which are mixed with each other, whereby a fine-grain sintering is carried out with reduced burn temperature.
  • the bonding of the carrier body constructed directly from catalyst material is therefore carried out by means of an inherent bonding process, in order to avoid the wetting of the catalytically active surface by an additional bonding agent.
  • fine grain sintering is therefore chosen as the bonding, which is achieved by mixing in a fine fraction of the same material.
  • the support material grains it is also possible for the support material grains to be additionally doped with catalytically-active noble or non-noble metals. For preference this takes place after the sintering. After the sintering it is also possible for the catalyst material grains to be doped with catalytically-active noble or non-noble metals (method steps a), b), c)).
  • materials for the doping particular consideration can be given to platinum, palladium, rhodium, gold, silver, nickel, copper, manganese, or cobalt. The doping serves to provide the additional achieved increase in catalytic activity and selectivity for special chemical reactions.
  • the modification of the catalyst material can be effected by wet-chemical doping methods or gas-phase coating methods.
  • the problem is resolved by a filter candle or tube according to claim 22 .
  • a filter candle or tube according to the invention can be manufactured by the cylindrical mould body, closed on one side, of a conventional filter candle or tube being filled with a deposit of catalyst material, and the open side of the mould is closed, so that the catalyst deposit is not carried out. It has proved advantageous in this context if the closure is formed as a porous ceramic layer.
  • the catalyst material there come into consideration oxides or mixed oxides of the rare earths, aluminates, silicates, titanates, and titanium dioxide.
  • the catalyst material may consist of a single substance, of several substances from one of the substance classes referred to heretofore, or of a mixture of substances from different substances classes as referred to heretofore.
  • Of particular preference in this situation is the use of calcium aluminate.
  • the catalyst material is modified with promoters.
  • a high effect of the filter candle according to the invention is achieved if the catalyst material is doped with catalytically-active noble or non-noble metals.
  • doping materials particular preference is given to platinum, palladium, rhodium, gold, silver, nickel, copper, manganese, or cobalt.
  • the advantage of the invention lies in the fact that catalytically-active ceramic filter elements are obtained which are resistant to high temperature, resistant to steam, and resistant to hetero-element compounds. They can therefore be arranged directly in the hot smoke or waste gases flow, and at the same time guarantee the removal of dust from the hot gas as well as the total conversion of organic pollutants and residual components. In addition to the gas purification effect, the substance foundation for the formation of dioxins is therefore also removed (DeNovo synthesis).
  • the catalytic design of the filter elements may contain the bi-functional effect of the catalyst system, i.e. the total oxidation or the thermal-catalytic splitting, and therefore the subsequent reactions, which depend on the catalyst material used in each case, or the doping material used, as appropriate.
  • Typical wall thicknesses of the inner support body of the filter candle are between 10 and 15 mm.
  • the application temperatures of the filter candles according to the invention range up to 1000° C.
  • mullite grain is used as a standard material, although other materials can also be used. In general, all ceramic oxides, nitrides, and carbides are suitable.
  • the membrane layer can be an asymmetrical membrane layer formed from several layers.
  • the membrane layer thickness can measure up to 200 ⁇ m, whereby the pore size is between 0.05 to 40 ⁇ m.
  • the membrane layer is manufactured from bonded inert grain or from fine particles manufactured by means of polymer sol-gel methods. As coating methods, consideration may be given to spraying, electrophoresis, film casting, mud casting, or the sol-gel method.
  • FIG. 1 represents a filter candle or tube 10 in a vertical section.
  • the filter candle or tube 10 has a first external coating 11 for particle separation, and a second internal layer 12 , which forms the support body.
  • the direction of flow is indicated with arrows.
  • FIG. 2 shows an enlarged section from the second layer 12 .
  • the support material particles 1 exhibit an irregular shape and are arranged at distances from one another. These particles 1 are connected to one another by means of the particles 2 , consisting of catalyst and bonding material, which form web-like bridges 3 . Between the web-like bridges 3 free spaces 4 remain for the passage of the gas which is being filtered, whereby the free spaces are represented enlarged for the purpose of clarity.
  • the particles 2 represented here in diagrammatic form are compound particles of catalyst and bonding agent material.
US10/332,582 2000-07-13 2001-07-13 Ceramic filter element and method for production thereof Abandoned US20040067175A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/544,586 US20070031304A1 (en) 2000-07-13 2006-10-10 Filter candle
US12/946,889 US8388898B2 (en) 2000-07-13 2010-11-16 Ceramic filter element

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10034045.8 2000-07-13
DE10034045A DE10034045A1 (de) 2000-07-13 2000-07-13 Keramisches Filterelement und Verfahren zu seiner Herstellung
PCT/EP2001/008171 WO2002005928A1 (fr) 2000-07-13 2001-07-13 Element filtrant en ceramique et procede pour sa production

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US11/544,586 Division US20070031304A1 (en) 2000-07-13 2006-10-10 Filter candle
US12/946,889 Continuation US8388898B2 (en) 2000-07-13 2010-11-16 Ceramic filter element

Publications (1)

Publication Number Publication Date
US20040067175A1 true US20040067175A1 (en) 2004-04-08

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Application Number Title Priority Date Filing Date
US10/332,582 Abandoned US20040067175A1 (en) 2000-07-13 2001-07-13 Ceramic filter element and method for production thereof
US11/544,586 Abandoned US20070031304A1 (en) 2000-07-13 2006-10-10 Filter candle
US12/946,889 Expired - Fee Related US8388898B2 (en) 2000-07-13 2010-11-16 Ceramic filter element

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/544,586 Abandoned US20070031304A1 (en) 2000-07-13 2006-10-10 Filter candle
US12/946,889 Expired - Fee Related US8388898B2 (en) 2000-07-13 2010-11-16 Ceramic filter element

Country Status (6)

Country Link
US (3) US20040067175A1 (fr)
EP (2) EP1772178A1 (fr)
JP (1) JP5322364B2 (fr)
AU (1) AU2001281982A1 (fr)
DE (2) DE10034045A1 (fr)
WO (1) WO2002005928A1 (fr)

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US20070245702A1 (en) * 2006-04-25 2007-10-25 Sharp Kabushiki Kaisha Honeycomb structure and manufacturing method thereof, and air cleaner and water purifier containing the honeycomb structure
US20100223848A1 (en) * 2007-05-02 2010-09-09 Pall Corporation Gasification apparatus and method for generating syngas from gasifiable feedstock material
CN113476958A (zh) * 2021-06-22 2021-10-08 南京玻璃纤维研究设计院有限公司 一种滤料及其制备方法和应用
CN114573321A (zh) * 2022-03-21 2022-06-03 安徽紫朔环境工程技术有限公司 一种基于3d打印技术催化陶瓷滤管的制备方法

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CA2741480A1 (fr) * 2008-10-22 2010-04-29 Robert S. Dahlin Procede de decontamination de gaz de synthese
KR102454125B1 (ko) * 2015-03-20 2022-10-14 토프쉐 에이/에스 촉매화된 세라믹 캔들 필터 및 공정 오프가스 또는 배기가스의 정화 방법
CN107648936A (zh) * 2017-08-24 2018-02-02 江苏亚峰科技集团有限公司 一种滤芯
EP3946681A1 (fr) 2019-03-27 2022-02-09 Johnson Matthey Public Limited Company Système de filtre catalysé pour le traitement de gaz d'échappement contenant des particules provenant de sources d'émission stationnaires
DE102020115015A1 (de) * 2020-06-05 2021-12-09 Rath Gmbh Filterkerze aufweisend einen Konzentrationsgradienten an Katalysatormetallen, Verfahren zu deren Herstellung sowie deren Verwendung in einem Abgasreinigungsverfahren

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US20110058990A1 (en) 2011-03-10
DE50111106D1 (de) 2006-11-09
JP2004503375A (ja) 2004-02-05
JP5322364B2 (ja) 2013-10-23
US20070031304A1 (en) 2007-02-08
AU2001281982A1 (en) 2002-01-30
WO2002005928A1 (fr) 2002-01-24
EP1303341B1 (fr) 2006-09-27
US8388898B2 (en) 2013-03-05

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