EP1304456A1 - Filtre à particules régénérable et méthode de régénération d'un filtre à particules - Google Patents

Filtre à particules régénérable et méthode de régénération d'un filtre à particules Download PDF

Info

Publication number
EP1304456A1
EP1304456A1 EP01203954A EP01203954A EP1304456A1 EP 1304456 A1 EP1304456 A1 EP 1304456A1 EP 01203954 A EP01203954 A EP 01203954A EP 01203954 A EP01203954 A EP 01203954A EP 1304456 A1 EP1304456 A1 EP 1304456A1
Authority
EP
European Patent Office
Prior art keywords
soot filter
microwave
soot
regenerative
absorbing material
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Withdrawn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
EP01203954A
Other languages
German (de)
English (en)
Inventor
Alfred Bliek
Ye Zhang-Steenwinkel
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.)
Stichting voor de Technische Wetenschappen STW
Universiteit Van Amsterdam
Original Assignee
Stichting voor de Technische Wetenschappen STW
Universiteit Van Amsterdam
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 Stichting voor de Technische Wetenschappen STW, Universiteit Van Amsterdam filed Critical Stichting voor de Technische Wetenschappen STW
Priority to EP01203954A priority Critical patent/EP1304456A1/fr
Priority to PCT/EP2002/011740 priority patent/WO2003033883A1/fr
Priority to EP02782963A priority patent/EP1438489A1/fr
Publication of EP1304456A1 publication Critical patent/EP1304456A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • F01N3/028—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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means using microwaves
    • 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

Definitions

  • the invention pertains to a regenerative soot filter device applicable to exhaust gases from combustion engines, particularly diesel type engines, comprising a microwave generator and a soot filter material.
  • Such a device is known in the art, e.g. from EP-A1-0 635 625.
  • This European patent application discloses a method of regenerating a ceramic soot filter, as well as a device for performing this method.
  • Soot deposited on the ceramic soot filter used for diesel exhaust gases is oxidized by application of microwave radiation from a microwave generator.
  • the soot is heated by the microwave radiation and oxidized in an oxygen excess present in the diesel exhaust gases. It is indicated that an ignition temperature of around 600°C is needed to completely oxidize soot which mainly comprises graphitic carbonaceous components, as well as aliphatic, alicyclic and aromatic hydrocarbons.
  • a catalytically active material may be present to enhance CO oxidation.
  • Noble metals especially Pt, Rd and Pd, are generally known to be particularly suitable for this catalytic requirement. They are, for instance, widely used as so-called three way catalysts in automobiles.
  • the object of the invention is to provide a regenerative soot filter device wherein the above mentioned drawbacks have been reduced or even eliminated, and a more efficient use of microwave energy is accomplished.
  • the regenerative soot filter device is characterized in that a microwave absorbing material is provided on the soot filter material.
  • the microwave absorbing material is provided on the soot filter material by deposition techniques known in the art so that the surface of the soot filter material is covered.
  • a deposition technique is chosen such that a physical or chemical bonding is obtained between the microwave absorbing material and the soot filter material, the bonding being capable of withstanding the working conditions.
  • the term 'microwave absorbing material' is shortly explained hereinafter for clarity's sake.
  • the microwave absorbing capacity of a material is indicated by its dielectric loss factor ⁇ ".
  • ⁇ dielectric loss factor
  • A n * f * ⁇ " * tan ⁇ / E 2
  • f the frequency of the microwave radiation
  • E the mean strength of the electromagnetic field in the absorbing volume
  • tan 6 the ratio of the dielectric loss factor ⁇ " to the dielectric constant ⁇ ' of the material.
  • the microwave absorbing material has a dielectric loss factor being a multiple of the dielectric loss factor of the soot filter material as well as the soot.
  • a known soot filter material like cordierite having a dielectric loss factor typically of 0.14 would be provided according to the invention with a microwave absorbing material having a dielectric loss factor being at least two times higher.
  • the use of such a microwave absorbing material with a dielectric loss factor higher than the filter material and the soot reduces the need to apply a high electric field strength, still allowing the soot to reach ignition temperatures. Consequently, an important advantage of the device according to the invention is that the ignition temperature of soot can be reached by applying lower strengths of the electrical field, resulting in a decrease of the energy consumption.
  • the invention aims at supplying thermal energy for the oxidation of soot while protecting the soot filter material from being overheated by providing the soot filter material with a microwave absorbing material as defined above.
  • the invention provides a regenerative soot filter device that uses microwave energy in a more efficient way, for instance a lower power of the applied microwave source may be employed. Moreover, a pulsing of microwave radiation to the extent according to the prior art is not required, so that the heating of the soot is less limited and more easily maintained in the device according to the invention, leading to a more complete oxidation of soot. Secondly, the microwave absorbing material provided on the soot filter material will also lower the penetration of microwave radiation into the soot filter material itself considerably.
  • the greater part of the surface of the soot filter material is covered by a microwave absorbing material to obtain a good heat exchange with soot as well as with the gas passing through and a sufficient protecting effect from overheating.
  • the absorption of microwave radiation is proportional to the volume of the microwave absorbing material, the beneficial effects can further be controlled by adjusting the thickness of the microwave absorbing material provided on the soot filter material.
  • the device according to the invention comprises also an oxidation catalyst to completely oxidize any partially oxidized products like CO, as well as other hydrocarbons present in the gas phase.
  • the device comprises a microwave absorbing material that is an oxidation catalyst.
  • the device according to the invention preferably comprises a microwave absorbing material comprising a compound AMO y having a perovskite structure (also referred to as 'a perovskite' hereinafter) wherein A is a rare earth metal, M is a transition metal, wherein the A atom is partly substituted by a different atom A', A' also being a rare earth metal and y is a numerator for the number of oxygen atoms O,the numerator y being dependent on the mean valency of the metalions included in the perovskite.
  • AMO y having a perovskite structure
  • M is a transition metal
  • y is a numerator for the number of oxygen atoms O,the numerator y being dependent on the mean valency of the metalions included in the perovskite.
  • the microwave absorbing material comprises a compound AMO y having a perovskite structure wherein A is La or Sr, A' is La, Ce, Hf or Sr, and M is Mn, Co, Fe or Ti.
  • AMO y having a perovskite structure wherein A is La or Sr, A' is La, Ce, Hf or Sr, and M is Mn, Co, Fe or Ti.
  • Perovskites containing combinations of these specific elements surprisingly show a higher catalytic activity over perovskites in general.
  • more preferred perovskites are compounds of formula AMO y wherein A is La, A' is Ce, M is Mn, and y is 3. It is noted that the value of y, being dependent on the mean valency of the metalions included in the perovskite, should formally be interpreted as an approximate value.
  • the device according to the invention preferably comprises microwave absorbing material comprising a perovskite as described above, wherein the degree of substitution of the A atom is between 5 and 40%.
  • Perovskites having these specific degrees of substitution surprisingly show a higher catalytic activity over perovskites in general.
  • Most preferred perovskites are compounds wherein the degree of substitution of the A atom is 20%, in particular La 0.8 Ce 0.2 MnO 3 .
  • the soot filter material in the soot filter device according to the invention can be a conventional one, such as ceramic cordierite, alumina, silica, zirconia or titania, preferably having a honeycomb structure design.
  • a favorable application of the regenerative soot filter device according to the invention is in (stationary and instationary) diesel engines, because diesel engines are generally known to produce more soot than other combustion engines.
  • the invention also relates to a method of regenerating a soot filter, comprising a soot filter material, which method comprises applying microwave radiation to the soot filter by a microwave generator and passing a gas flow comprising oxygen over the soot filter, characterized in that the microwave radiation applied to the soot filter is absorbed by a microwave absorbing material that is provided on the soot filter material.
  • the microwave absorbing material used is an oxidation catalyst.
  • a microwave absorbing material that comprises a compound AMO y having a perovskite structure wherein A is a rare earth metal, M is a transition metal, wherein the A atom is partly substituted by a different atom A', A' also being a rare earth metal and y is a numerator for the number of oxygen atoms O.
  • the microwave absorbing material comprises a compound AMO y having a perovskite structure wherein A is La or Sr, A' is La, Ce, Hf or Sr, and M is Mn, Co, Fe or Ti.
  • AMO y having a perovskite structure wherein A is La or Sr, A' is La, Ce, Hf or Sr, and M is Mn, Co, Fe or Ti.
  • more preferred perovskites are compounds of formula AMO y wherein A is La, A' is Ce, M is Mn, and y is 3 +/- d.
  • a perovskite as defined above is used, wherein the degree of substitution of the A atom is between 5 and 40%, more preferably 20%.
  • An aqueous solution of corresponding nitrates was used with sodium hydroxide solution and hydrogen peroxide as the precipitating agents.
  • the pH was kept at pH 9-9.4 at 50°C.
  • the metal nitrates, the sodium hydroxide solution and hydrogen peroxide were added to 600 ml double distilled water while vigorously stirring the suspension.
  • the precipitation time was about 90 minutes.
  • the precipitate was aged for about 30 minutes, filtered off, washed three times with double distilled water to remove the remaining reactants, and dried over night at 120°C in air. After drying the precipitates were crushed and sieved to obtain a particle size between 125 and 212 ⁇ m.
  • ground precipitates were calcined in technical air at different temperatures with heating rate of 5°C.min -1 (with the final temperature ranging from 500°C to 800°C, preferably 800°C) for 6 hours with an airflow of 100 ml/min.
  • the catalytic activity of the perovskites from Example 1 was investigated by using CO oxidation as model system.
  • the experiments were carried out in a reactor coupled to a mass spectrometer (MS).
  • MS mass spectrometer
  • a gas mixture with 1 vol% CO and 1 vol% O 2 in He was passed over the catalyst.
  • As a catalyst 50 mg of perovskite was used having a particle size smaller than 0.2 mm.
  • the conversion of CO was measured by MS in a temperature range of 75-300°C with a heating rate of 5°C/min. The results are given in fig. 1.
  • Example 2 The impact of water vapor addition on catalyzed CO oxidation over La 0.8 Ce 0.2 MnO 3 prepared according to Example 1 is demonstrated in fig. 2.
  • the addition of 3 vol.% water to the gas mixture used in Example 2 causes the decrease of the CO conversion.
  • the CO conversion reduces instanteneously to about 72% of its original level, at which it stabilizes very quickly. After removal of the water-supply the activity is rapidly restored to about 100% of its original level. After repeated cycles the same activity levels are reached.
  • This hydrothermal stability renders the perovskite more favorable to be applied to engine exhaust gases which normally contain some water vapor as well.
  • the microwave heating was carried out in a microwave system, which consisted of microwave source (2.45 GHz, 1kW, Muegge, MW-46029-850-01), a circulator (Philips, 27722.163.02071), a 3-stub tuner section (Muegge, MW-7614-0060), a monomode microwave cavity TE 10 and water load.
  • the radiation is transported through the wave-guide, which is formed by a copper rectangular channel with the dimensions 0f 7.21 cm (width) by 3.61 cm (height), to the desired location.
  • the circulator is placed to protect the microwave source from the reflected radiation. Any radiation reflected in the reactor is led to a water load located behind the circulator.
  • the stub tuners are used to minimize the reflected radiation.
  • a quartz tubular reactor with internal diameter of 18 mm is placed in the applicator section, which contains two power sensors (Rhode & Schwarz, 828.3818.02).
  • the water load at the end of the wave-guide absorbs any microwave radiation after passing through the reactor.
  • the microwave set-up system is operated in travelling wave mode; any radiation not absorbed after passing through the microwave cavity, is absorbed by the water load.
  • a sample with constant volume (10 ml) was placed in the reactor.
  • the temperature in the sample bed was controlled through a temperature control loop coupled to the microwave power and the optical fiber.
  • All the perovskites La 1-x Ce x MnO 3 show the microwave absorption, independent of the quantity of substitution of lanthanum by cerium.
  • the perovskites also show high thermal stability upon the heating from 24 hours, because no gas release was measured by MS, and the weight before and after is comparable.
  • the dielectric constant and the dielectric loss factor of La 0.9 Ce 0.1 MnO 3 were measured at room temperature and the frequency ranged from 30 MHz to 3000 MHz. The obtained results are shown in fig. 3.
  • the real part of dielectric constant of this perovskite ( ⁇ ') is about 4 and the dielectric loss factor, the imaginary part ( ⁇ ") is about 0.91.
  • the dielectric loss factor of this perovskite is about six times and two times higher.
  • the results of the repeated heating over La 0.8 Ce 0.2 MnO 3 at 200W are presented in fig. 4.
  • a preferred embodiment of the device according to the invention is depicted in Figure 5, showing said device in cross sectional view.
  • a regenerative soot filter device 1 is equipped with a soot filter material 10 of cordierite ceramic with a honeycomb structure on which microwave absorbing material is provided.
  • the soot filter material 10 is positioned in a cylindrical filter chamber 12 having two narrowing conical ends 11.
  • At the height of the soot filter material 10 at the outside of the filter chamber 12 is connected to one end of a microwave conducting channel 15 which is at the other end connected to a microwave generator 16, so that microwave radiation generated can enter the filter chamber 12.
  • One narrowing conical end of the filter chamber 12 is connected to an inlet for exhaust gases 20 and the other narrowing conical end is connected to an outlet 22 for the gases after having passed through the soot filter material 10.
  • the filter chamber 12 is further equipped with so-called Lambda quarter traps 18 to trap microwave radiation in order to prevent leakage of radiation out into other parts connected to the regenerative soot filter device 1.
  • the direction of the gas stream is indicated by arrows 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)
EP01203954A 2001-10-17 2001-10-17 Filtre à particules régénérable et méthode de régénération d'un filtre à particules Withdrawn EP1304456A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01203954A EP1304456A1 (fr) 2001-10-17 2001-10-17 Filtre à particules régénérable et méthode de régénération d'un filtre à particules
PCT/EP2002/011740 WO2003033883A1 (fr) 2001-10-17 2002-10-16 Dispositif de filtre a suie a regeneration et procede de regeneration d'un filtre a suie
EP02782963A EP1438489A1 (fr) 2001-10-17 2002-10-16 Dispositif de filtre a suie a regeneration et procede de regeneration d'un filtre a suie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01203954A EP1304456A1 (fr) 2001-10-17 2001-10-17 Filtre à particules régénérable et méthode de régénération d'un filtre à particules

Publications (1)

Publication Number Publication Date
EP1304456A1 true EP1304456A1 (fr) 2003-04-23

Family

ID=8181092

Family Applications (2)

Application Number Title Priority Date Filing Date
EP01203954A Withdrawn EP1304456A1 (fr) 2001-10-17 2001-10-17 Filtre à particules régénérable et méthode de régénération d'un filtre à particules
EP02782963A Withdrawn EP1438489A1 (fr) 2001-10-17 2002-10-16 Dispositif de filtre a suie a regeneration et procede de regeneration d'un filtre a suie

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP02782963A Withdrawn EP1438489A1 (fr) 2001-10-17 2002-10-16 Dispositif de filtre a suie a regeneration et procede de regeneration d'un filtre a suie

Country Status (2)

Country Link
EP (2) EP1304456A1 (fr)
WO (1) WO2003033883A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1820562A1 (fr) * 2006-02-21 2007-08-22 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Filtre à particules pour diesel pour la purification de gaz d'échappement le contenant
EP2169191A1 (fr) 2008-09-30 2010-03-31 Perkins Engines Company Limited Méthode et dispositif de régénération d'un filtre.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028720A1 (de) * 1989-09-28 1991-04-11 Interatom Keramischer wabenkoerper, enthaltend stoffe mit hoher dielektrozitaetskonstante
JPH04279715A (ja) * 1991-03-06 1992-10-05 Toyota Motor Corp 内燃機関の排気浄化装置
EP0635625A1 (fr) 1993-06-26 1995-01-25 DORNIER GmbH Méthode et appareil d'incinération de la suie d'un filtre pour particules solides d'un moteur diesel
US5622680A (en) * 1990-07-25 1997-04-22 Specialites Et Techniques En Traitement De Surfaces-Stts Post-combustion catalysts
EP1160427A2 (fr) * 2000-05-31 2001-12-05 Corning Incorporated Filtre à particules pour moteurs diesel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0872911A3 (fr) * 1997-04-15 2000-05-03 Zexel Corporation Couche d'absorption pour un catalyseur à chauffage à haute fréquence

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028720A1 (de) * 1989-09-28 1991-04-11 Interatom Keramischer wabenkoerper, enthaltend stoffe mit hoher dielektrozitaetskonstante
US5622680A (en) * 1990-07-25 1997-04-22 Specialites Et Techniques En Traitement De Surfaces-Stts Post-combustion catalysts
JPH04279715A (ja) * 1991-03-06 1992-10-05 Toyota Motor Corp 内燃機関の排気浄化装置
EP0635625A1 (fr) 1993-06-26 1995-01-25 DORNIER GmbH Méthode et appareil d'incinération de la suie d'un filtre pour particules solides d'un moteur diesel
EP1160427A2 (fr) * 2000-05-31 2001-12-05 Corning Incorporated Filtre à particules pour moteurs diesel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 080 (M - 1368) 17 February 1993 (1993-02-17) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1820562A1 (fr) * 2006-02-21 2007-08-22 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Filtre à particules pour diesel pour la purification de gaz d'échappement le contenant
US7923408B2 (en) 2006-02-21 2011-04-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Diesel particulate filter and exhaust emission control system
EP2169191A1 (fr) 2008-09-30 2010-03-31 Perkins Engines Company Limited Méthode et dispositif de régénération d'un filtre.

Also Published As

Publication number Publication date
EP1438489A1 (fr) 2004-07-21
WO2003033883A1 (fr) 2003-04-24

Similar Documents

Publication Publication Date Title
US9643160B2 (en) Electrically heated catalyst for a compression ignition engine
RU2704801C2 (ru) ДИЗЕЛЬНЫЙ ОКИСЛИТЕЛЬНЫЙ КАТАЛИЗАТОР, ОБЛАДАЮЩИЙ АКТИВНОСТЬЮ АДСОРБЕРА NOx
JP5210316B2 (ja) Ｃｅ−Ｚｒ−Ｒ−Ｏ触媒、Ｃｅ−Ｚｒ−Ｒ−Ｏ触媒を含む物品並びに該Ｃｅ−Ｚｒ−Ｒ−Ｏ触媒の製造及び使用方法
US6358880B1 (en) Support composition based on a cerium oxide, a zirconium oxide and a scandium or rare earth oxide and use for treating exhaust gas
RU2735770C1 (ru) Способ и устройство для повышения конверсии nox в выхлопных газах путем введения озона
JP2002058931A (ja) マイクロ波再生ディーゼル微粒子フィルタおよびその製造方法
EP3334912B1 (fr) Système d'échappement comprenant un adsorbeur de nox passif
JPH07189661A (ja) 固体触媒の加熱を促進させる方法
JP2009036199A (ja) 排ガスの物質浄化装置
US9006131B2 (en) Composite oxide for exhaust gas purification catalyst, method for manufacturing the same, coating material for exhaust gas purification catalyst, and filter for diesel exhaust gas purification
KR101574553B1 (ko) 배기가스 정화촉매용 복합산화물과 그 제조방법 및 배기가스 정화촉매용 도료와 디젤 배기가스 정화용 필터
JP2011252387A (ja) 内燃機関の排気浄化装置
US6767526B1 (en) Method for treating by combustion carbon-containing particles in an internal combustion engine exhaust circuit
KR102020303B1 (ko) 선택적 촉매환원반응용 저온 탈질촉매 및 그 제조방법
CN105327706A (zh) 一种低温催化去除环境污染物的催化剂及其制备方法
EP2954950B1 (fr) Catalyseur d'épuration des gaz d'échappement du type à occlusion-réduction des nox et procédé d'épuration des gaz d'échappement l'utilisant
EP1304456A1 (fr) Filtre à particules régénérable et méthode de régénération d'un filtre à particules
RU2389535C2 (ru) Каталитический фильтр для дизельной сажи и способ его использования
US10975744B2 (en) Exhaust gas purification apparatus for motor vehicles
JPH04241717A (ja) 排ガス浄化装置
JP2006140063A (ja) マイクロ波加熱方法及びマイクロ波加熱装置
JPH10288027A (ja) 高周波加熱触媒
JP2000104538A (ja) 排気ガス浄化装置
JP2019173583A (ja) 車両用排ガス浄化装置
US9114389B2 (en) Method for producing catalyst composition, catalyst composition, diesel particulate filter using the same, and exhaust gas purification system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20031024