EP1912726A1 - Dispositif de reduction selective de nox dans des gaz d'echappement contenant du nox - Google Patents

Dispositif de reduction selective de nox dans des gaz d'echappement contenant du nox

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Publication number
EP1912726A1
EP1912726A1 EP06776827A EP06776827A EP1912726A1 EP 1912726 A1 EP1912726 A1 EP 1912726A1 EP 06776827 A EP06776827 A EP 06776827A EP 06776827 A EP06776827 A EP 06776827A EP 1912726 A1 EP1912726 A1 EP 1912726A1
Authority
EP
European Patent Office
Prior art keywords
carrier layer
hydrogen
exhaust gases
selective
reduction
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Withdrawn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
EP06776827A
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German (de)
English (en)
Inventor
Florian Schott
Sven Kureti
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Universitaet Karlsruhe
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Filing date
Publication date
Application filed by Universitaet Karlsruhe filed Critical Universitaet Karlsruhe
Publication of EP1912726A1 publication Critical patent/EP1912726A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • B01J37/0244—Coatings comprising several layers
    • 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
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/652—Chromium, molybdenum or tungsten
    • B01J23/6527—Tungsten
    • 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
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • B01J37/0225—Coating of metal substrates
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/202—Hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20715—Zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20776—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/902—Multilayered catalyst
    • B01D2255/9025—Three layers
    • 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
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/34—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electrolyser
    • 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
    • F01N2370/02—Selection of materials for exhaust purification used in 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
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/04—Adding substances to exhaust gases the substance being hydrogen
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • 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
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a device for selective NO x - reduction in NO x -containing exhaust gases, a method for selective NO x reduction in NO x -containing exhaust gases, a catalyst for use in a selective NO x reduction in NO x -containing exhaust gases by supplying hydrogen to the exhaust gases and a method for producing a catalyst for selective NO x - reduction in NO x -containing exhaust gases.
  • EP 1 475 149 A1 discloses a catalyst for the reduction of NO x to N 2 with hydrogen under O 2 -rich conditions.
  • This known catalyst is based on platinum, which is distributed in an amount between 0.1 and 2 percent by weight on a carrier material consisting of magnesium or cerium oxide or a precursor thereof.
  • a carrier material consisting of magnesium or cerium oxide or a precursor thereof.
  • the catalyst used in this case adsorbs the nitrogen oxides located in the exhaust gas, whereupon the catalyst is supplied with a gas having a specific content of a reducing substance at predetermined time intervals and for certain periods of time.
  • Such storage catalysts in which basic components such as lithium oxide, potassium oxide, sodium oxide, barium oxide or similar oxides are used, however, require a relatively complicated control and usually have a high regeneration requirement.
  • NO x storage catalysts In these NO x storage catalysts, the mainly emitted NO is oxidized on a platinum-containing catalyst to NO 2 , which is subsequently adsorbed to special storage media, for example BaCO 3 . When the storage capacity of this catalyst is exhausted, a motor-induced regeneration of the catalyst is initiated, in which the nitrogen oxides introduced are converted into nitrogen.
  • special storage media for example BaCO 3 .
  • Another disadvantage of the known NO x storage catalysts is the danger of poisoning of the NO x sorbents by the sulfur oxides SO 2 and SO 3 contained in the exhaust gas. To avoid this problem, usually costly engine management strategies are required.
  • EP 0 960 649 B1 discloses an exhaust gas purification catalyst in which the materials used comprise cerium oxide and / or zirconium dioxide mixed oxides which serve to remove saturated hydrocarbons from the exhaust gas.
  • the materials used comprise cerium oxide and / or zirconium dioxide mixed oxides which serve to remove saturated hydrocarbons from the exhaust gas.
  • As a reducing agent for the nitrogen oxides contained in the exhaust gas is Ammo used niak.
  • the active component V 2 O 5 frequently used in such SCR catalysts is of toxicological concern and may also melt or vaporize at very high exhaust gas temperatures.
  • EP 0 763 380 A1 describes shell catalysts which consist of a core and at least one outer shell or of a support, at least one inner and at least one outer shell, the outer shells containing oxides of specific elements. Furthermore, a method for the catalytic removal of nitrogen oxides, carbon monoxide and hydrocarbons from the exhaust gases of internal combustion engines is described.
  • the exhaust gas has a temperature of 50 to 800 0 C and a pressure of 0.01 to 200 bar and it is again ammonia used as a reducing agent.
  • DE 44 36 890 A1 describes a method for the simultaneous reduction of the hydrocarbons, carbon monoxide and nitrogen oxides contained in the exhaust gas of an internal combustion engine.
  • the catalyst used in this case has an aluminum silicate as a high surface area support material.
  • the device according to the invention allows optimal use of the catalyst for selective NO x reduction of exhaust gases, wherein the hydrogen can be introduced in a simple manner by means of the hydrogen supply into the exhaust pipe.
  • the use of zirconia for the support layer, platinum for the active component, and tungsten oxide for the promoter / activator results in a catalyst having both higher DeNO x activity and much higher N 2 selectivity than known catalyst compositions. to which contributes in a particularly advantageous manner, the supply of hydrogen to the exhaust gases.
  • Tungsten oxide as a promoter, which advantageously increases the activity of platinum and contributes to a considerable improvement in the selectivity in the reduction of NO x to N 2 , is particularly advantageous, since this is a toxicologically harmless substance, which is thus both in the production as well as in a possible later disposal no problems.
  • platinum and tungsten oxide are present as a mixture on the surface of the carrier body.
  • the hydrogen supply device has a feed opening leading to the exhaust pipe, which is provided with a closure whose opening state can be changed by a control device.
  • the carrier layer of zirconium oxide has a surface area of at least 50 m 2 / g, in particular of at least 100 m 2 / g.
  • a large surface of the carrier layer leads to a significantly improved effectiveness of the catalyst of the device according to the invention in the same size.
  • a very high efficiency or effectiveness of the catalyst of the inventive device is achieved when the backing layer of zirconia in a tetragonal crystal structure ⁇ present.
  • Fig. 1 is a very schematic representation of a first embodiment of the structure of the catalyst of the device according to the invention
  • the catalyst 1 shows, in a very schematic and greatly enlarged illustration, a first embodiment of a catalytic converter 1, which serves for the selective reduction of NO x in the exhaust gases of an internal combustion engine 2 shown in FIG. 3, preferably operating according to the diesel principle.
  • the catalyst 1 has a base body 3 which generates the same rigidity and which may be formed, for example, as a honeycomb body and may consist of a ceramic material.
  • the main body 3 may also be designed as a soot filter to filter any soot particles from the exhaust gases.
  • a carrier layer 4 which consists of zirconium oxide (ZrO 2 ).
  • the carrier layer 4 is preferably highly porous and has a surface area of at least 50 m 2 / g, preferably of at least 100 m 2 / g, of the carrier layer 4 and the zirconium oxide is present in a tetragonal crystal structure.
  • a coating 5 which has an active component 5a, which in the present case consists of platinum (Pt), and a promoter 5b, which consists of tungsten oxide.
  • the tungsten oxide and then the platinum are applied to the carrier layer 4.
  • the tungsten oxide is present as tungsten salt in an aqueous solution which is applied to the carrier layer 4.
  • the platinum salt ie the platinum salt solution, also present in an aqueous solution, is then applied to the carrier layer 4 coated with the tungsten oxide and then dried again. Again, calcination and reduction in a reductant-containing gas stream may follow. In this procedure, therefore, two drying steps are required, whereas in the production of the catalyst lysators 1 shown in FIG. 1 only a drying step is required.
  • Fig. 3 shows a device 6 for selective NO x reduction in the exhaust gases of the internal combustion engine 2, with which it is possible to perform a method for selective NO x reduction in the exhaust gases of the internal combustion engine 2, wherein the exhaust gases hydrogen is supplied as a reducing agent ,
  • the supply of hydrogen to the exhaust gases results in an immediate conversion of NO x with H 2 to N 2 and H 2 O on the catalyst 1.
  • the catalyst 1 is arranged in an exhaust pipe 7 extending from the internal combustion engine 2.
  • the device 6 further comprises a hydrogen supply device 8, which has a container 9 which is provided with a feed opening 10. To the feed opening 10, a supply line 11 is connected, which leads to the exhaust pipe 7.
  • the supply opening 10 is provided with a closure 12, the opening state of which can be changed by the action of a control device 13.
  • the control device 13 is in turn connected to a NO x sensor 14 arranged in the exhaust gas line 7 and to a sensor 15 which is arranged in an intake line 16 which leads to the internal combustion engine 2.
  • the sensor 15 is formed in this case as per se known mass air flow sensor and able to measure the flowing to the internal combustion engine 2 air mass flow.
  • the sensor 15 could also be arranged in the exhaust pipe 7 and it would also be possible to provide a temperature sensor in the exhaust pipe 7. Furthermore, it would also be possible to dispense with one of the two sensors 14 or 15.
  • the control device 13 is thereby able to conduct the hydrogen present in the container 9 as a function of the NO x concentration within the exhaust gas line 7 or as a function of an air mass flow through the internal combustion engine 2 into the exhaust gas line 7. In this way, for example, in an acceleration process in which a higher NO x emissions is to be expected, a larger amount of hydrogen to be introduced into the exhaust pipe 7. It is also possible to deposit the required data in a map in the control device 13 in order to supply an increased amount of hydrogen at certain times. Of course, it is also possible to continuously guide the hydrogen in the exhaust pipe 7. Another possibility is to direct a certain basic amount of hydrogen into the exhaust pipe 7 and to increase the amount of hydrogen introduced at a detected by one of the sensors 14 or 15 need.
  • the hydrogen supply device 8 can be connected to a device, not shown, for reforming hydrocarbon or derivatives to hydrogen from the fuel provided for the internal combustion engine 2, ie a reformer or the like.
  • the required hydrogen could also be produced by means of an electrolysis of a suitable substance, for example water.
  • H 2 generator the container 9 can either be omitted or replaced by a smaller intermediate storage. If the main body 3 is not simultaneously designed as a soot filter, as described briefly above, so in the flow direction of the exhaust gas in the exhaust pipe 7, a particle filter, not shown, the catalyst 1 upstream or downstream. The main body 3 thus serves only for holding the carrier layer 4.
  • Tmax temperature at which the maximum NO conversion is measured
  • Ref. 1 "Kinetics and mechanism of the reduction of nitric oxides by H 2 under lean-burn conditions on a Pt-Mo-Co / ⁇ -Al 2 O 3 catalyst" by Brigitta Frank, Gerhard Emig, Albert Renken (Labora- tory of Chemical Reaction and Electrochemical Engineering
  • Ref. 2 "An investigation of the NO / H 2 / O 2 reaction on noble metal catalysts at low temperature under lean-burn conditions" by R. Burch, MD Coleman (Catalysis Research Center, Chemistry Department, University of Reading, Whiteknights, Berks, RG ⁇ 6AD, UK) (Applied Catalysis B: Environmental 23 (1999) 115-121) - 48/2. Ref.
  • Ref. 4 "An investigation of the NO / H 2 / O 2 (lean deNO x) Reaction on a highly active and selective Pt / La 0th 5 Ce 0th 5 / MnO 3 Catalyst" by CN.
  • Costa, VN Stathopoulos, VC Belessi and AM Efstathiou (Department of Chemistry, University of Cyprus, PO box 20537, CY 1678 Nicosia, Cyprus; and Department of Chemistry, University of Vietnamesenina, Vietnamese) (Journal of Catalysis 197, 350-364 (2001)) - 54/4.
  • Ref. 5 "Investigation of the NO / H 2 / O 2 (Lean De-NO x ) Reaction on a Highly Active and Selective PtZLa 0-7 Sr 0-2 Ce 0-2 FeO 3 Catalyst at Low Temperatures" of CN. Costa, PG Savva, C Andronikou, PS Lambrou, K. Polychronopoulou, V.
  • the catalyst 1 was subjected to hydrothermal aging at 780 ° C. for 15 hours. Subsequently, the tests were carried out again under the same conditions and the same results were obtained, which leads to the conclusion that the hydrothermal aging has not led to any damage or impairment of the operation of the catalyst 1.

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

Abstract

L'invention concerne un dispositif de réduction sélective de NO<SUB>x</SUB> dans des gaz d'échappement contenant du NO<SUB>x</SUB>, présentant un catalyseur (1) disposé dans une ligne d'échappement, comportant un corps de base (3), une couche porteuse (4) en oxyde de zircon, disposée sur le corps de base, un composant actif (5a) en platine, disposé sur la couche porteuse (4), un promoteur (5b) en oxyde de tungstène, disposé sur la couche porteuse (4), et un dispositif d'alimentation en hydrogène destiné à introduire de l'hydrogène dans la ligne d'échappement.
EP06776827A 2005-08-12 2006-08-14 Dispositif de reduction selective de nox dans des gaz d'echappement contenant du nox Withdrawn EP1912726A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005038547A DE102005038547A1 (de) 2005-08-12 2005-08-12 Katalysator zur Verwendung bei einer selektiven NOx-Reduktion in NOx-haltigen Abgasen
PCT/EP2006/008014 WO2007020035A1 (fr) 2005-08-12 2006-08-14 Dispositif de reduction selective de nox dans des gaz d'echappement contenant du nox

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EP1912726A1 true EP1912726A1 (fr) 2008-04-23

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EP (1) EP1912726A1 (fr)
DE (1) DE102005038547A1 (fr)
WO (1) WO2007020035A1 (fr)

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US7622096B2 (en) 2007-08-09 2009-11-24 Basf Catalysts Llc Multilayered catalyst compositions
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US7718153B2 (en) 2008-05-16 2010-05-18 Siemens Energy, Inc. Catalytic process for control of NOx emissions using hydrogen
DE102010040808A1 (de) 2010-09-15 2012-03-15 Karlsruher Institut für Technologie Katalysator zur Verwendung bei einer selektiven NOx-Reduktion
DE102015120344A1 (de) 2015-11-24 2017-05-24 Hans Seidl Vorrichtung zur Reduktion von Stickoxiden
US10066587B2 (en) 2016-02-09 2018-09-04 Ford Global Technologies, Llc Methods and systems for a variable volume engine intake system
DE102016107466A1 (de) 2016-04-22 2017-10-26 Keyou GmbH Katalysator, Vorrichtung und Verfahren zur selektiven NOx-Reduktion mittels Wasserstoff in NOx-haltigen Abgasen
DE102017124541A1 (de) 2017-10-20 2019-04-25 Argomotive Gmbh Vorrichtung zur Nachbehandlung von Abgasen eines Verbrennungsmotors
DE102018127219A1 (de) 2018-10-31 2020-04-30 Keyou GmbH Katalysator zur Verwendung bei einer selektiven NOx-Reduktion in NOx-haltigen Abgasen, Verfahren zur Herstellung eines Katalysators, Vorrichtung zur selektiven NOx-Reduktion und Verfahren zur selektiven NOx-Reduktion

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DE102005038547A1 (de) 2007-02-15
WO2007020035A1 (fr) 2007-02-22

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