EP1751409A1 - Minimisation des emissions d'hydrocarbures aromatiques polycycliques lors de la regeneration de filtres a particules - Google Patents

Minimisation des emissions d'hydrocarbures aromatiques polycycliques lors de la regeneration de filtres a particules

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Publication number
EP1751409A1
EP1751409A1 EP05750495A EP05750495A EP1751409A1 EP 1751409 A1 EP1751409 A1 EP 1751409A1 EP 05750495 A EP05750495 A EP 05750495A EP 05750495 A EP05750495 A EP 05750495A EP 1751409 A1 EP1751409 A1 EP 1751409A1
Authority
EP
European Patent Office
Prior art keywords
adsorption
catalyst
filter
diesel
particle filter
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Withdrawn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
EP05750495A
Other languages
German (de)
English (en)
Inventor
Roman Baican
Ronny Mönnig
Peter Zima
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.)
Fiat Auto SpA
GM Global Technology Operations LLC
Original Assignee
Fiat Auto SpA
GM Global Technology Operations LLC
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 Fiat Auto SpA, GM Global Technology Operations LLC filed Critical Fiat Auto SpA
Publication of EP1751409A1 publication Critical patent/EP1751409A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filter
    • 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
    • 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
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
    • 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
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
    • B01D46/84—Chemical processes for the removal of the retained particles, e.g. by burning by heating only
    • 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
    • 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
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0835—Hydrocarbons
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7027—Aromatic hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/22—Selection of materials for exhaust purification used in non-catalytic purification apparatus
    • F01N2370/24—Zeolitic material
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0684—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having more than one coating layer, e.g. multi-layered coatings

Definitions

  • PAH polycyclic aromatic hydrocarbons
  • Honeycomb filters ceramic cell filters
  • RiC silicon carbide
  • mullite a soot layer is formed, which causes a fixed exhaust gas back pressure over time.
  • Candle filters are made from ceramic fibers, which are wound into a filter candle.
  • the fibers consist of silicon oxide or aluminum oxide and are specially processed to improve the filtration.
  • the particles When flowing through the filter candle, the particles are deposited between the fibers by adhesive forces and impact, whereby there is usually no soot layer (so-called depth filter).
  • foam bodies are made from aluminum oxide or silicon carbide (SiC), through which the exhaust gas flows, the soot particles being embedded in the structure.
  • SiC silicon carbide
  • the filter efficiency can be controlled via the pore size, but is usually insufficient for the requirements in the automotive sector.
  • the stored soot must be removed continuously or periodically.
  • the filter temperatures are usually briefly increased to values that enable the retained carbon particles to be burned safely and quickly. Temperatures above 620 ° C are required for the efficient combustion of a soot particle, which are difficult to achieve in diesel exhaust gas even when operating at full load (e.g. when driving uphill with a trailer load). Additional energy must therefore be supplied in order to set the regeneration conditions, whereby a discontinuous loading and regeneration process is usually observed.
  • the W096 / 24755 AI discloses a device for reducing the amount of soot particles escaping in diesel internal combustion engines, which consist of a container with a gas inlet and outlet nozzle and a hollow body, which is partially filled with a knitted fabric made of filter material, the fuel before the internal combustion engine is supplied with a catalytic additive and the filter material has a plurality of knitted ceramic packets, the ceramic packets being knitted hoses rolled from one end and made of high-quality ceramic threads, which are traversed by a heat-resistant wire, the coarse mesh size of the hose has a certain size and the heat-resistant wire runs through every single stitch of the knitted fabric.
  • European patent EP-B-0 703 352 discloses an exhaust emission control system with a particulate filter, the filter having at least one catalyst in its upstream part in the flow of a regenerative gas and in its downstream part, which is regenerated by the use of this regenerative gas, containing the fuel, the control system Determination means for determining when the filter needs to be regenerated.
  • the control system in this filter includes a partial combustion control means for causing particle combustion in only the downstream part of the filter in the flow of the regenerative gas by controlling the temperatures so that combustion of the fuel in the regenerative gas is caused only in the downstream part of the filter.
  • combustion spread control means for causing the particle combustion in the downstream portion of the filter to spread to the upstream portion of the filter in the regenerative gas stream by burning the fuel in the regenerative gas over the catalyst in the upstream portion of the filter.
  • the health hazard posed by diesel soot is recognized to be attributable to the above-mentioned accumulations, in particular polycyclic aromatic hydrocarbons (PAHs) and among these the PAHs from the group naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene , Benz (a) anthracene, chrysene, benzo (b) fluoranthene, benzo (k) fluoranthene, benz (a) pyrene, dibenz (ah) anthracene, benzo (ghi) perylene and indenopyrene apart from the nitro-PAHs are particularly dangerous get ranked.
  • PAHs polycyclic aromatic hydrocarbons
  • Temperature as set forth above, can be increased to temperatures above 620 ° C. Due to the high heat capacity of the engine and the entire exhaust system, this temperature is only reached with a considerable time delay in the entire filter, which consequently manifests itself in the filter heating up slowly.
  • the present invention was therefore based on the object of providing a catalyst and a method which minimizes or prevents the escape of PAHs from the exhaust system.
  • this object is achieved by a method for reducing the emissions of diesel-powered engines with particle filters, in which, when the particle filter is regenerated, the polycyclic aromatic hydrocarbons (PAHs) are first bound in adsorption layers and cracked in this absorber material at higher temperatures (with a time delay).
  • PAHs polycyclic aromatic hydrocarbons
  • the method according to the invention leads to a significant reduction in the possible PAH emissions and thus to a reduction in any health risks associated with the regeneration of diesel particle filters and in the upstream process of engine enrichment for the desired increase in the exhaust gas temperature. temperatures.
  • the process is also characterized by a high level of flexibility, which enables it to be adapted to all common filter systems. It is also advantageous that the method according to the invention is highly insensitive to sulfur, so that use in countries with inferior fuel is harmless.
  • the PAHs are bound in suitable adsorption layers without being able to get into the environment with the exhaust gas stream. With the time-delayed rise in temperature in the filter, the PAHs are converted into low molecular weight and easily destructible compounds (mainly cracked).
  • Suitable adsorption layers that can be used in the process according to the invention are, for example, those on a natural basis (i.e. those which are biodegradable).
  • Preferred adsorption layers are modified clay minerals, in particular modified clay minerals from the smectite group.
  • montmorillonite the main component of bentonite
  • the more expensive synthetic representatives of mesoporous molecular sieves, such as M41S, or hydrophobic, temperature-insensitive zeolites are also suitable for this application.
  • the adsorption on adsorption layers from mineral adsorbents and catalysts preferably from modified clay minerals, particularly preferably from modified clay minerals from the smectite group, or M41S-related silicates is carried out.
  • Bentonite is the name given to clayey rocks that have arisen from the weathering of volcanic ash.
  • the properties of the bentonites are determined by the clay mineral montmorillonite. Their outstanding ability of pillaring, ie the targeted expansion of the silicate layer structure, is particularly characteristic and can be used advantageously.
  • Montmorillonite is an aluminum hydrosilicate (layer silicate) that belongs to the group of phyllosilicates. Montmorillonite is the main representative in the group of (dioctahedral) layered silicates, which are also known as smectites. In practice, bentonite, smectite and montmorillonite are therefore used as synonyms for swellable multilayer silicates. Bentonite can also contain accompanying minerals such as quartz, feldspar, mica.
  • a montmorillonite crystal is made up of about 15 to 20 elementary layers. In addition to the crystal water, there are exchangeable cations between these layers, which compensate for the negative excess charges of the lattice (tetravalent aluminum). These are loosely bound to the lattice and can be replaced by other cations or by positively charged organic molecules (eg alkylammonium salts). Bentonites and montmorillonites have a pronounced ability to ion exchange and to store organic, mostly strongly polar particles. The specific surface area of montmorillonite when pilled can be up to 800 m 2 / g. In practice, only 300-400 m 2 / g are often obtained, which is mainly due to structural defects.
  • bentonites calcium bentonite, in which the smectite group is almost exclusively occupied by Ca 2+ or Mg 2+ ions in the intermediate layers; Sodium bentonite (natural bentonite), in which the smectite group is predominantly coated with Na 2+ ions in the intermediate layers, but Ca 2+ or Mg 2+ , NH4 + ions can also be present in various amounts; Active bentonite, which is originally a calcium bentonite, in which the original cation coating of the intermediate layers is calic activation are exchanged by nations; acid-activated bentonite, in which the smectite group is partially dissolved in a special process in connection with acids, whereby large surfaces are created; Organobentonite, in which the cations of the interlayers are exchanged for polar, organic molecules (such as quaternary ammonium compounds). This hydrophobization allows the bentonite to swell even in polar liquids.
  • modified clay minerals mentioned in particular the modified clay minerals from the smectite group and from these the montmorillonite, have been proven to be very suitable for the adsorption / storage of PAHs desorbable from the soot. On the other hand, they are able to efficiently crack the retained PAHs when the temperatures rise.
  • the process according to the invention is preferably carried out in such a way that ⁇ low molecular weight and thus easily degradable (0- xycat) compounds are products of the cracking process.
  • processes are preferred in which the catalytic cracking is characterized by the selective formation of an HC (O) fraction (chain length) with 2-6 carbon atoms.
  • acidic zeolites and other tectosilicates such as M41S can also be used as adsorbents for the PAHs.
  • the activated hydrophobic zeolites have an MFI structure, with ZSM zeolites such as ZSM-5 being particularly preferred. These have the general empirical formula [Na n (H 2 0) ⁇ 6 ] [Al n Si 96 - n O ⁇ 92 ] -MFI, n ⁇ 27.
  • the modification which increases the activity can, on the one hand, consist of exchanging the sodium ions in whole or in part for H + in order to obtain acidic zeolites in this way, on the other hand the zeolites can also be modified by metal loading.
  • zeolites which can be used as the adsorption layer, particularly acidic, metal-modified (Cu, Fe) and thus oxidation-active zeolites are preferred, it being possible to dispense with the use of expensive and (by discharge) toxic noble metals.
  • the hexagonal MCM-41 phase which belongs to the family of M41S materials, has mesopores with diameters in the range from 2 nm to 10 nm and a specific surface area above 1000 m 2 / g.
  • the H (O) C fraction formed by the cracking process is not passed into the environment with the exhaust gas stream, but is instead oxidized to water and carbon dioxide.
  • Processes according to the invention in which the cracked HC fraction is passed over an oxidizing coating in a further stage are preferred according to the invention.
  • Preferred processes according to the invention are characterized in that the two stages (adsorption with subsequent cracking and oxidation of the products) are carried out on a catalyst.
  • the PAHs are first adsorbed and then cracked, and the cracked products are then passed over an oxidation catalyst.
  • the two stages are represented on a catalyst, such as multi-brick systems or zone coating.
  • Another object of the present invention is a diesel particle filter (DPF) for carrying out the exhaust gas purification method according to the invention.
  • DPF diesel particle filter
  • Such a DPF has at least one component that is capable of PAH effectively withheld and chemically converted in a suitable manner when the temperature rises subsequently.
  • both the catalytic cracking and an optional subsequent oxidation are expediently carried out within a component.
  • a diesel particle filter (DPF) according to the invention for carrying out the method according to the invention is characterized in that it has at least adsorption layers made of zeolites and / or mesoporous and / or pillared clay minerals.
  • the adsorber and cracking material can be arranged directly inside the particle filter (for example by coating the gas outlet channels). However, it can also be contained in a separately arranged further catalyst brick if the (insufficient) temperature resistance of the selected material does not allow it.
  • a filter / catalyst design with a high-cell substrate can also be used, the coating types for the adsorption and the subsequent cracking being applied in a specific arrangement along the carrier.
  • a catalytic converter design in zone technology is particularly suitable, in which more adsorbing and cracking coating is applied at the catalyst inlet and more locally oxidizing coating is applied towards the catalyst outlet. In principle, however, no restrictions are made on catalyst distribution on the support (separate zones, multi-brick system or zone course).
  • the catalytically active compounds for cracking the hydrocarbons in particular the mineral carriers, preferably modified clay minerals, particularly preferably modified clay minerals from the smectite group, are used as the basis for the catalyst, such a zone profile can be realized in that only one coating for the oxidation of the resulting hydrocarbons is applied to the carrier. Further measures improving the invention are described in more detail below with the description of three specific exemplary embodiments of the invention with reference to the figures. It shows:
  • FIG. 1 shows a schematic illustration of a diesel particle filter in a first embodiment
  • FIG. 2 shows a schematic illustration of a diesel particle filter in a second embodiment
  • FIG 3 shows a schematic representation of a diesel particle filter in a third embodiment.
  • a diesel particle filter la for carrying out the method according to the invention has an adsorption layer 4 on the side of an inflowing exhaust gas 2, whereas an oxidizing coating 5 is provided on the side of the exhaust gas 3 flowing out of the diesel particle filter la.
  • the entire exhaust gas first passes through the adsorption layer 4 and then through the oxidizing coating 5 of the diesel particle filter la.
  • a diesel particle filter 1b is equipped with a composite coating which is arranged between inflowing exhaust gas 2 and outflowing exhaust gas 3 and which combines the adsorption layer 4 'and the oxidizing coating 5'.
  • coatings according to the invention are applied to a diesel particle filter 1c in a specific arrangement along the longitudinal extent of the diesel particle filter 1c such that the adsorption layer 4 ′′ is provided at the catalyst inlet on the part of the inflowing exhaust gas 2 and the oxidizing coating 5 ′′ is applied to the catalytic converter outlet on the part of the outflowing exhaust gas 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Catalysts (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Selon l'invention, les émissions d'hydrocarbures aromatiques polycycliques (polycyclischen aromatischen Kohlenwasserstoffen / PAK) provenant du système d'échappement de moteurs diesel à filtres à particules, peuvent être minimisées ou supprimées. A cet effet, lors de la régénération du filtre à particules, les hydrocarbures aromatiques polycycliques (PAK) sont tout d'abord fixés dans des couches d'adsorption où ils sont ensuite craqués à haute température, l'élimination des produits de craquage étant réalisée de préférence au cours d'une étape d'oxydation.
EP05750495A 2004-05-18 2005-05-13 Minimisation des emissions d'hydrocarbures aromatiques polycycliques lors de la regeneration de filtres a particules Withdrawn EP1751409A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024519A DE102004024519A1 (de) 2004-05-18 2004-05-18 Minimierung von PAK-Emissionen bei der Regeneration von Partikelfiltern
PCT/EP2005/005284 WO2005113953A1 (fr) 2004-05-18 2005-05-13 Minimisation des emissions d'hydrocarbures aromatiques polycycliques lors de la regeneration de filtres a particules

Publications (1)

Publication Number Publication Date
EP1751409A1 true EP1751409A1 (fr) 2007-02-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05750495A Withdrawn EP1751409A1 (fr) 2004-05-18 2005-05-13 Minimisation des emissions d'hydrocarbures aromatiques polycycliques lors de la regeneration de filtres a particules

Country Status (7)

Country Link
US (1) US20070217978A1 (fr)
EP (1) EP1751409A1 (fr)
JP (1) JP2007538192A (fr)
KR (1) KR20070052703A (fr)
CN (1) CN1965152B (fr)
DE (1) DE102004024519A1 (fr)
WO (1) WO2005113953A1 (fr)

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WO2012085931A1 (fr) 2010-12-22 2012-06-28 Mahindra & Mahindra Limited Système intégré de post-traitement du gaz d'échappement pour des moteurs diesel

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WO2011042976A1 (fr) * 2009-10-08 2011-04-14 イビデン株式会社 Appareil et procédé de purification des gaz d'échappement
DE102009060289A1 (de) * 2009-12-23 2011-06-30 Volkswagen AG, 38440 Abgasreinigung bei Ottomotoren unter Verwendung eines Adsorbers mit Partikelfilterfunktion
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JP5599747B2 (ja) * 2011-03-24 2014-10-01 日本碍子株式会社 ハニカム構造体及びその製造方法
US9080480B2 (en) * 2011-07-01 2015-07-14 Toyota Jidosha Kabushiki Kaisha Exhaust purification system for internal combustion engine
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DE102004024519A1 (de) 2005-12-15
WO2005113953A1 (fr) 2005-12-01
US20070217978A1 (en) 2007-09-20
CN1965152A (zh) 2007-05-16
KR20070052703A (ko) 2007-05-22
JP2007538192A (ja) 2007-12-27

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