EP1924340A1 - Exhaust gas cleaning component for cleaning an internal combustion engine exhaust gas - Google Patents
Exhaust gas cleaning component for cleaning an internal combustion engine exhaust gasInfo
- Publication number
- EP1924340A1 EP1924340A1 EP06791679A EP06791679A EP1924340A1 EP 1924340 A1 EP1924340 A1 EP 1924340A1 EP 06791679 A EP06791679 A EP 06791679A EP 06791679 A EP06791679 A EP 06791679A EP 1924340 A1 EP1924340 A1 EP 1924340A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust gas
- gas purification
- coating
- purification component
- oxygen storage
- 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- Withdrawn
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 title abstract description 5
- 239000007789 gas Substances 0.000 claims abstract description 102
- 238000000576 coating method Methods 0.000 claims abstract description 71
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000001301 oxygen Substances 0.000 claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 70
- 239000011248 coating agent Substances 0.000 claims abstract description 68
- 238000000746 purification Methods 0.000 claims description 63
- 230000003197 catalytic effect Effects 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 15
- 230000032683 aging Effects 0.000 description 12
- 239000003054 catalyst Substances 0.000 description 10
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 230000007704 transition Effects 0.000 description 10
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 241000158147 Sator Species 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013025 ceria-based material Substances 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229910003447 praseodymium oxide Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F01N3/10—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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
-
- 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
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
-
- 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
- B01D53/9495—Controlling the catalytic process
-
- 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
- B01J35/19—Catalysts containing parts with different compositions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/908—O2-storage component incorporated in the catalyst
-
- 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
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
-
- 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
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/16—Oxygen
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- Exhaust gas purification component for cleaning an engine exhaust gas
- the invention relates to an exhaust gas purification component for cleaning an engine exhaust gas having the features of the preamble of claim 1.
- the channels are usually provided with a catalytically active coating, which is applied to the channels, so that the exhaust gas flowing through the channels comes into contact with the coating and catalyzed by the coating reactions of exhaust gas components can proceed.
- the coatings have an oxygen storage capacity. This allows in particular a catalyzing of redox reactions.
- aging of the exhaust gas purification component may result in a reduction of its functionality.
- aging may be accompanied by a decrease in the oxygen storage function. Such undesirable aging effects reduce the reliability of the corresponding emission control component.
- the object of the invention is therefore to provide an exhaust gas purification component with improved operational reliability.
- the coating with oxygen storage capability is provided for a first delimited subregion of the carrier body, and a second delimited subregion of the carrier body is free of a coating with oxygen storage capability or has a coating with a greatly reduced oxygen storage capacity compared to the first subsection.
- the coating used is preferably a coating designed as a so-called washcoat.
- the coating may contain finely divided catalytically active noble metals, in particular of the platinum group.
- the coating contains an oxygen-capable material, such as an oxide of a rare-earth element. This is homogeneously distributed in the coating or the washcoat, so that the coating has an overall oxygen storage capacity in this case.
- cerium oxide and / or praseodymium oxide-based oxides or mixed oxides as materials with oxygen storage capability, which are homogeneously distributed in the coating, so that the coating as a whole has an oxygen storage capacity.
- the first sub-area For the first sub-area, a share of about 20% to 70% of the Materials with oxygen storage capacity in the coating are preferred. By contrast, a content of less than 10% is preferred for the second subregion. However, the second portion may also have a coating that does not contain such material, or it may be completely free of coating. For the sake of simplicity, an OSC-rich subarea and an OSC-poor or OSC-free subarea (OSC) will be referred to below for the embodiments of the first and the second subarea.
- OSC-rich subarea and an OSC-poor or OSC-free subarea OSC
- different shaped regions of the exhaust gas purification component may be formed as a first or second partial region.
- the extend first and / or the second portion over the entire length of the carrier body, but not over the full cross-sectional area.
- the first and / or the second subregion can also extend over the full cross-sectional area of the carrier body, but not over the entire length.
- the first portion and / or the second portion extend over the entire cross section of the carrier body and are limited in the axial direction with respect to the extension of the carrier body.
- This embodiment is particularly easy to manufacture by means of a dip / suction coating.
- the first subarea adjoins the second subarea.
- an OSC-rich subarea extends over the entire cross section of the carrier body and in the axial direction directly adjoins an OSC-poor or OSC-free subarea which likewise extends over the entire cross section. In this way, the transitions are clearly defined and located in the axial direction on the carrier body.
- the first OSC-rich subregion extends over the predominant part of the length of the carrier body.
- This embodiment is particularly advantageous for exhaust gas purification components that require a large amount of oxygen storage capacity for their function. For example, this is the case with three-way catalysts.
- the first, OSC-rich subsection extends from an end which is remote from the input side of the carrier body in the axial direction Place to the output side end of the carrier body.
- An input-side, preferably disk-shaped portion of the carrier body is thus OSC-poor or OSC-free executed. This avoids that oxygen-storing materials experience an increased aging in the usually particularly temperature-stressed input area of the exhaust gas cleaning component.
- heat-dissipating reactions proceeding from the input area are displaced axially to the rear via the oxygen-storing material.
- sufficient oxygen storage capacity is still available downstream of the OSC-poor or OSC-free input area for the function of the exhaust gas purification component.
- At least two spaced-apart (OSC-rich) first partial regions are provided for the exhaust gas purification component. It can be advantageous, in particular, for the function of an exhaust gas catalytic converter as an exhaust gas purification component to alternate successively in the axial direction, preferably in each case disk-shaped OSC-poor or OSC-free partial areas and OSC-rich partial areas.
- the exhaust gas purification component is designed as an exhaust gas catalytic converter. It may be a so-called full catalyst or a so-called supported catalyst. Particularly advantageous is an embodiment of the exhaust gas purification component according to the invention as a three-way catalyst.
- the exhaust gas purification component is designed as an exhaust gas particle filter.
- This is preferably a particle filter in a so-called wall-flow design.
- the channels of the particulate filter can along its gas inlet side and / or be catalytically coated along its gas outlet side or be substantially free of a catalytic coating.
- temperature detection means are provided for detecting the temperature of the coating with oxygen storage capability in the first subregion.
- temperature changes caused by redox reactions occurring via the OSC-rich coating can be detected. If the activity of the coating decreases as a result of aging, this can be detected by the detected temperatures of the coating.
- a modification transition of the oxygen-storing material occurring during an oxygen storage can be detected, since this is usually accompanied by a heat of reaction.
- their oxygen storage capacity can be detected. Therefore, it is possible to diagnose the exhaust gas purifying component, since age-related deterioration of the function of the oxygen-storing coating can be detected through the temperature detection.
- 1 shows a first advantageous embodiment of the exhaust gas purification component according to the invention
- 2 shows a second advantageous embodiment of the exhaust gas purification component according to the invention
- FIG. 6 shows a first arrangement of a temperature sensor for the exhaust gas purification component according to the invention in a side view (left) and in a front view (right),
- Fig. 7 shows a second arrangement of a
- Temperature sensor for the exhaust gas purification component according to the invention in a side view
- Fig. 8a to 8d further advantageous embodiments of the exhaust gas purification component according to the invention in conjunction with a temperature sensor arranged in FIG. 6 and
- FIG. 1 schematically shows an exhaust gas purification component 1 designed as an exhaust gas catalyst m honeycomb body design.
- the catalytic converter 1 may be embodied as a so-called full catalytic converter in which the honeycomb body itself consists of catalytically active material, a supported catalytic converter with a metallic or ceramic carrier body is assumed below.
- the carrier body is of a plurality of flow channels. 2 crossed on the walls 3 at least partially a coating is applied, which is not shown in detail. This is preferably a catalytically active coating.
- the exhaust gas catalytic converter 1 is provided in its rear partial region 5 with an OSC-rich coating, ie with a coating having a comparatively large oxygen storage capacity.
- the catalytic converter 1 is OSC-free or low-OSC.
- the input-side partial region 6 can be designed to be free of a coating or have a coating without or with a comparatively low oxygen storage capacity. From a manufacturing point of view, it is preferred if coatings on the walls 3 of the flow channels 2 in the respective subregions 5, 6 are applied approximately uniformly and comprise the entire cross section of the catalytic converter 1.
- FIG. 1 The embodiment shown in FIG. 1 is preferred for a catalytic converter which is used close to the engine as the first catalytic exhaust gas purification component in the exhaust gas system of an internal combustion engine.
- Such exhaust gas cleaning components are exposed to strong thermal loads, in particular in their input area, since the incoming exhaust gas can have high temperatures. Reactions of reactive exhaust constituents with oxygen stored in the catalyst and / or modification transitions of the oxygen storage material itself may further increase the temperature load on the catalyst.
- the input region of the catalytic converter is OSC-poor or OSC-free.
- the directly adjacent downstream portion 5 is preferably carried out uniformly rich OSC.
- an input-side subregion 5 OSC-rich and a directly adjacent, downstream subregion 6 are OSC-poor or OSC-free , This embodiment is recommended if an increased oxygen storage capacity is not required for the function of the exhaust gas purification component 1. This may be the case, for example, in an exhaust gas purification component 1 designed as an oxidation catalyst or as a soot filter.
- the input-side OSC-rich subregion 5 can serve in particular in this case as a diagnostic region such that the aging of the exhaust gas purification component 1 is determined by repeated determinations of the oxygen storage capability of the OSC-rich subregion 5.
- An approximately 5 mm to 50 mm, or an approximately 5% to 50% of its total length OSC-rich executed input-side portion 5 of the exhaust gas purification component 1 is advantageous.
- an input-side partial region 5 ⁇ as well as a rear partial region 5 are OSC-rich, ie designed with a coating with comparatively high oxygen storage capacity.
- OSC-rich subregions 5 ⁇ 5 Between the OSC-rich subregions 5 ⁇ 5, an OSC-poor or OSC-free executed middle portion 6 is arranged.
- the middle OSC-poor or OSC-free executed partial region 6 preferably makes up about 20% to 30% of the total length of the exhaust gas catalytic converter. sators 1 off.
- the catalytic converter 1 therefore has an OSC-rich coating over the greater part of its length, so that its relevant function is available to a sufficient extent.
- an exhaust gas catalyst 1 is shown.
- a middle portion 5 is executed OSC rich.
- a directly adjacent front portion 6 and a directly adjacent rear portion 6 ⁇ OSC arm or OSC-free running.
- Such an embodiment is particularly advantageous for catalytic exhaust gas purification components in which a comparatively low oxygen storage capacity is required.
- This embodiment offers the advantage over a coating implemented over the entire length with a uniformly reduced oxygen storage capability that only a partial region has a reduced temperature resistance.
- the central portion 5 makes up about 20% to 60% of the total length of the catalytic converter 1.
- OSC-rich subregions 5, 5... 5 > ⁇ , 5 ⁇ > ⁇ alternate with OSC-poor or OSC-free subareas 6, 6 ⁇ , ⁇ x 6 ⁇ .
- the input-side portion 6 OSC-poor or OSC-free executed.
- the entrance area has a coating with high oxygen storage capacity. Since, in particular, cerium-containing coatings can catalyze water gas shift reactions with formation of hydrogen, in such a case hydrogen formed in the subregions with high oxygen storage capacity can be used in the subsequent subregions with little or no oxygen storage capability. This way you can the catalytic function of the catalytic converter 1 can be extended.
- each subregion makes up about 20% of the total length of the catalytic converter 1.
- the individual subregions can be made approximately the same length or different lengths.
- an improved catalytic function of the exhaust gas purification component results.
- the embodiment according to the invention can be used for monitoring the exhaust gas purification component with respect to its aging. For this purpose, a temperature detection of the coating with oxygen storage capacity in the OSC-rich portion is made such that a heat of reaction of a occurring during the storage of oxygen modification transition of the material can be detected with oxygen storage capacity. When oxygen is stored in the material with oxygen storage capacity, this changes from an oxygen-poor modification into an oxygen-rich modification.
- ceria-based materials having oxygen storage ability ceria changes from its trivalent form (Ce 2 ⁇ 3 ) to tetravalent form (CeO 2 ).
- the corresponding oxygen uptake reaction proceeds very rapidly and exothermally, therefore, with the storage of oxygen, the temperature of the coating with oxygen storage capacity increases. Due to the nature of the temperature increase can therefore be determined whether and to what extent a modification transition occurs, ie whether and to what extent material with oxygen storage capacity is available.
- a catalyst aging for example, as a result of exposure to elevated temperatures or poisoning, itself makes noticeable by a decrease in the oxygen storage capacity, can be evaluated by evaluating the temperature increase in the oxygen storage of the aging state of the exhaust gas purification component and a diagnosis can be performed. For this purpose, for example, the size of the temperature increase is determined and compared with a reference value.
- a temperature detection made at a distance from the exhaust gas inlet can distinguish between the temperature-increasing effect of a gas oxidation and a modification transition in the coating.
- a particularly reliable monitoring of the exhaust gas purification component can be made with determination of the existing there oxygen storage capacity.
- a change in operating mode of the internal combustion engine with a transition from reducing exhaust gas to a conditions with oxygen deficiency to oxidizing exhaust conditions with oxygen surplus occurring temperature increase evaluated. In this way, caused by gas oxidation temperature effects can be effectively hidden.
- the detection of the heat of reaction of the modification transition occurring when oxygen is stored in the material with oxygen storage capability can advantageously be carried out in exhaust-gas purification components which, according to the embodiments shown in FIGS. 1 and 3, are predominantly provided with an OSC-rich coating from the outset.
- the temperature detection can be done only at one point in the OSC-rich coating or at several axially and / or radially offset positions.
- a temperature sensor is preferably brought into heat-transmitting connection with the corresponding coating.
- the temperature sensor is preferably introduced in the radial direction or in the axial direction into the exhaust gas purification component and with its temperature-sensitive region in heat-transfer contact with the OSC-rich coating.
- FIG. 6 schematically shows a radial feed of a temperature sensor 7 into an exhaust gas purification component 1.
- the temperature-sensitive region of the temperature sensor 7 can be arranged off-center. A placement approximately at the height of the central longitudinal axis is of course also possible.
- FIG. 7 schematically shows an axial feed of a temperature sensor 7 into an exhaust gas purification component 1.
- a placement of the temperature sensor 7 in height of the central longitudinal axis, as shown is not required.
- the sensor axis can be moved parallel to the central longitudinal axis, these cut or skewed stand to her.
- the OSC-rich subregion 5 surrounds only the temperature-sensitive region of the temperature sensor 7 in the radial direction.
- the OSC is shown in FIGS. 8b and 8d -rich portion 5 in the axial direction comparatively short and only in the vicinity of the temperature sensor 7 available.
- the OSC-rich subregion 5 surrounds the entire sensor 7 from its entry point into the exhaust gas purification component 1; in FIG. 8d, the OSC-rich subregion 5 surrounds only the temperature-sensitive tip of the temperature sensor 7.
- a temperature sensor 7 for example designed as a thermocouple
- the latter can be in heat-transfer contact with an OSC-rich coating which is uniform over the entire component length or in an axial subarea or, as illustrated, with an OSC-rich coating present only in the immediate vicinity of the temperature-sensitive region of the temperature sensor 7.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005044545A DE102005044545A1 (en) | 2005-09-17 | 2005-09-17 | Exhaust gas purification component for cleaning an engine exhaust gas |
PCT/EP2006/008383 WO2007031190A1 (en) | 2005-09-17 | 2006-08-26 | Exhaust gas cleaning component for cleaning an internal combustion engine exhaust gas |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1924340A1 true EP1924340A1 (en) | 2008-05-28 |
Family
ID=37497058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06791679A Withdrawn EP1924340A1 (en) | 2005-09-17 | 2006-08-26 | Exhaust gas cleaning component for cleaning an internal combustion engine exhaust gas |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090301069A1 (en) |
EP (1) | EP1924340A1 (en) |
JP (1) | JP2009508049A (en) |
DE (1) | DE102005044545A1 (en) |
WO (1) | WO2007031190A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7960935B2 (en) | 2003-07-08 | 2011-06-14 | The Board Of Regents Of The University Of Nebraska | Robotic devices with agent delivery components and related methods |
GB0716833D0 (en) * | 2007-08-31 | 2007-10-10 | Nunn Andrew D | On board diagnostic system |
EP2322773B1 (en) * | 2009-10-28 | 2016-08-17 | Umicore AG & Co. KG | Method for cleaning combustion engine exhaust gases |
US9611868B2 (en) | 2010-04-09 | 2017-04-04 | Shipstone Corporation | System and method for energy storage and retrieval |
DE102013210270A1 (en) * | 2013-06-03 | 2014-12-04 | Umicore Ag & Co. Kg | three-way |
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JP3800200B2 (en) * | 1997-04-23 | 2006-07-26 | トヨタ自動車株式会社 | Exhaust gas purification method and exhaust gas purification catalyst |
JP3370957B2 (en) * | 1998-09-18 | 2003-01-27 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
US20040001781A1 (en) * | 2002-06-27 | 2004-01-01 | Engelhard Corporation | Multi-zone catalytic converter |
DE10248842A1 (en) * | 2002-10-19 | 2004-04-29 | Daimlerchrysler Ag | Process and apparatus for determining the deterioration condition of an exhaust gas catalyst using temperature and oxygen partial pressure measurements |
JP4359765B2 (en) * | 2004-01-29 | 2009-11-04 | 三菱自動車工業株式会社 | Exhaust purification catalytic equipment |
DE102004012159A1 (en) * | 2004-03-12 | 2005-09-29 | Adam Opel Ag | Monolithic catalyst, to clean exhaust gases from an IC motor, has a carrier with parallel flow channels coated with a noble metal only at the section towards the inflow |
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2005
- 2005-09-17 DE DE102005044545A patent/DE102005044545A1/en not_active Withdrawn
-
2006
- 2006-08-26 WO PCT/EP2006/008383 patent/WO2007031190A1/en active Application Filing
- 2006-08-26 JP JP2008530365A patent/JP2009508049A/en active Pending
- 2006-08-26 US US12/067,105 patent/US20090301069A1/en not_active Abandoned
- 2006-08-26 EP EP06791679A patent/EP1924340A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of WO2007031190A1 * |
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US20090301069A1 (en) | 2009-12-10 |
JP2009508049A (en) | 2009-02-26 |
DE102005044545A1 (en) | 2007-03-22 |
WO2007031190A1 (en) | 2007-03-22 |
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