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
  • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
  • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
  • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • 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
  • B01D53/9463—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 one brick
  • B01D53/9472—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 one brick in different zones
• • 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
• • B01J35/613—
• • 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
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
  • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
  • F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
• • 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 filters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2251/00—Reactants
  • B01D2251/20—Reductants
  • B01D2251/206—Ammonium compounds
  • B01D2251/2067—Urea
• • 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
  • B01D2255/2065—Cerium
• • 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
  • B01D2255/20707—Titanium
• • 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
  • B01D2255/20738—Iron
• • 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
  • B01D2255/30—Silica
• • 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
  • B01D2255/00—Catalysts
  • B01D2255/90—Physical characteristics of catalysts
  • B01D2255/903—Multi-zoned catalysts
  • B01D2255/9032—Two zones
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2255/00—Catalysts
  • B01D2255/90—Physical characteristics of catalysts
  • B01D2255/92—Dimensions
  • B01D2255/9207—Specific surface
• • 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
  • B01J21/063—Titanium; Oxides or hydroxides thereof
• • 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
  • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
  • B01J23/24—Chromium, molybdenum or tungsten
  • B01J23/30—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
  • B01J29/00—Catalysts comprising molecular sieves
  • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
  • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
  • B01J29/65—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the ferrierite type, e.g. types ZSM-21, ZSM-35 or ZSM-38, as exemplified by patent documents US4046859, US4016245 and US4046859, respectively
  • B01J29/66—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the ferrierite type, e.g. types ZSM-21, ZSM-35 or ZSM-38, as exemplified by patent documents US4046859, US4016245 and US4046859, respectively containing iron group metals, noble metals or copper
  • B01J29/68—Iron group metals or copper
• • 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
  • F01N2250/00—Combinations of different methods of purification
  • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
• • 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
• • 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
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• • 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

• Device for treating the exhaust gases of a vehicle comprising a heat engine.
• the present invention relates to a device for treating the exhaust gas of a vehicle comprising a heat engine, equipped with an exhaust gas depollution device for treating unburned hydrocarbons, carbon monoxide to the of a treatment system by catalytic selective reduction of nitrogen oxides emitted by the engine and a fuel additive system used by the engine.
• Thermal engines such as those used by private vehicles or heavy vehicles, emit a number of emissions that should be limited to minimize the dissipation of pollutants such as nitrogen oxides, carbon monoxide or particles consisting for example of unburned hydrocarbons.
• the selective reduction of nitrogen oxides is commonly practiced for the purification of stationary plant fumes, using as a selective agent ammonia stored in a suitable tank.
• an ammonia precursor is used, such as pure urea or in solution. aqueous. Urea or urea solution is injected into the exhaust line; the water contained in the solution is vaporized and then the urea (NH 2 ) 2CO is decomposed into ammonia and isocyanic acid, said acid being itself hydrolysed by thermolysis.
• urea into the exhaust line must be carried out either continuously or pulsed and precisely dosed, in order to to treat all the nitrogen oxides present and secondly, to avoid untimely emission of ammonia.
• the continuous selective reduction by ammonia on catalysts based on zeolites exchanged with either iron or copper is one of the technologies well known to those skilled in the art and it is well suited for applications on DIESEL vehicles, but has a low temperature limitation, typically this process is not implemented when the catalyst inlet temperature is below about 170 ° C.
• NOx trap Another nitrogen oxides reduction device known under the name NOx trap consists of trapping the nitrogen oxides in the form of nitrates at low temperature and then reducing these nitrates to nitrogen by passages in a rich medium, it is possible to ie when the exhaust gases are reducing.
• This device is very intrusive at engine settings and is not very efficient at high temperatures because the storage capacity of NOx on the NOx trap phases drops sharply from 350 ° C.
• the exhaust lines are also equipped with filters, known as particle filters, which trap in particular the unburnt particles due to a temperature of the exhaust gas substantially too low.
• particle filters filters, known as particle filters, which trap in particular the unburnt particles due to a temperature of the exhaust gas substantially too low.
• the filter is filter wall type, ceramic, for example cordierite, or silicon carbide, or aluminum titanium, through which the exhaust gas flow. It may also be sieves made of wire cloth, ceramic foam or fibrous material.
• This filter is capable of stopping a high proportion of soot generated by the combustion of the fuel in the engine. However, it becomes less and less effective as the soot accumulates because it closes progressively the filter, which leads to a pressure drop that increases in the filter, and ultimately reduces the performance of the engine. It is therefore necessary to regularly burn the soot collected by the filters, by an operation called "regeneration of the filter". Also, periodically, these filters must be regenerated by temporarily increasing the temperature of the exhaust gas to burn the filtered particles.
• a regeneration technique uses a so-called catalyzed filter particle filter, which is composed of a filter and a catalytic phase deposited in the porosity of the filter walls of the filter.
• These catalytic phases may be based on noble metals such as platinum deposited on supports such as alumina or cerium-zirconium oxides, or based on mixed oxides such as cerium-zirconium-praseodymium ternary oxides.
• This technique also has drawbacks: noble metals are complex to form on supports, and are an expensive raw material. And the ternary oxides have a modest efficiency at low temperature, which imposes relatively long filter regeneration times, so overconsumption fuel.
• an exhaust gas treatment device consisting of a particulate filter disposed in the exhaust line, retaining the soot and particles and loaded on its outer face with a SCR catalytic material for reducing NOx, means being provided to bring ammonia into the exhaust line upstream of the particulate filter.
• a SCR catalytic material for reducing NOx means being provided to bring ammonia into the exhaust line upstream of the particulate filter.
• Regeneration can also be cyclically in a known manner by increasing the hydrocarbon content in the exhaust gas.
• the reaction that follows is highly exothermic and may damage the SCR catalyst material.
• the SCR catalysts proposed in US 2008/0041040 are not sufficiently resistant to thermal stresses and therefore lose their effectiveness over time and their use.
• the present invention aims to propose a device for treating exhaust gases from an engine.
• thermal device comprising a particulate filter consisting of a porous material for trapping and oxidizing soot and a selective reduction catalyst of the nitrogen oxides deposited on the outlet faces of the walls of the particulate filter, characterized in that said catalyst selective reduction is chosen from those of the type having a specific surface area of at least 65M 2 / g after aging at 800 ° C.
• the catalyst material SCR is chosen to advantageously withstand the thermal stresses encountered during the regeneration of the particulate filter and be thermally stable so that the treatment device according to the invention has all the qualities required to meet the requirements of the invention. standards increasingly severe.
• the specific surface of the catalyst remains high even after aging, that is to say after having been subjected to hydrothermal stresses at 800 ° C.
• said selective reduction catalyst is chosen from those of the type having a specific surface area of at least 65M 2 / g after aging at 850 ° C. Even more preferably, the selective reduction catalyst is selected from those of the type having a surface area of at least 65M 2 / g after aging at 900 ° C.
• specific surface is meant the specific surface B.E.T. determined by nitrogen adsorption according to ASTM D 3663-78 established from the BRUNAUER-EMMETT-TELLER method described in the periodical "The Journal of the American Chemical Society, 60,309 (1938).
• an SCR catalyst material for a device according to the invention may be chosen from acidic oxides such as those described by the company Rhodia, the commercial SCR catalytic phase based on Zr-Ti-Si-W-Ce and any other catalyst material having a surface area of at least 65 M 2 / g after aging at 800 ° C.
• the oxidation of soot in the treatment device is promoted by the use of an additive Ce or Ce-Fe or Fe introduced into the fuel that lowers the soot combustion temperature.
• an exhaust gas treatment device in the inlet channels from which the particles are retained and are the soot is then oxidized during regeneration, the soot being oxidized to CO 2 and H 2 O, at a temperature lowered by means of the additive from the fuel and deposited on the soot while on the wall of the outlet the reduction of NOx by ammonia on the SCR catalyst deposited on these filtering walls.
• urea or ammonia may be introduced upstream of the treatment device according to the invention.
• urea is introduced into the exhaust line downstream of the oxidation catalyst of CO and hydrocarbons and upstream of the treatment device according to the invention.
• a catalyst for decomposing urea ammonia deposited on the inlet channels of the particle filter of the treatment device according to the invention is preferably provided. The urea is thus decomposed in the wall of the particle filter, which makes it possible to avoid using a mixer upstream of the Filter / SCR device.
• the invention also relates to a motor vehicle comprising such a treatment device.
• Example 1 Device according to the state of the art
• Example 1 a processing device is produced according to the prior state described in US 2008/004140, an SCR catalyst according to this document being deposited on the outlet face of a particulate filter (FAP).
• FAP particulate filter
• composition of the SCR catalyst in the SiC particle filter of 400 cpsi is as follows:
• FAP deposition of anatase titanium oxide, on the exit channels of the FAP deposition of 101 grs / l of FAP of a commercial SCR catalyst based on 2% by weight of iron deposited on a zeolite ferrierite.
• Example 2 is carried out a device according to the invention by deposition of a commercial SCR catalytic phase based on Zr-Ti-Si-W-Ce on a 400cpsi SiC particle filter.
• This active phase is deposited on the outlet wall of the particle filter channels by conventional dipping, blowing, drying and calcining at 500 ° C.
• composition of the catalyst according to the invention is as follows:
• Example 3 Aging Devices of Examples 1 and 2
• This hydrothermal treatment is applied to represent the hydrothermal aging that the FAP-catalyst devices undergo during regeneration of particulate filters under real conditions on the vehicle.
• Catalyst A for the catalyst of Example 1 aged at 850 ° C.
• Catalyst B for the catalyst of the invention described in Example 2 aged at 850 ° C.
• the catalysts A and B are evaluated on a synthetic gas bench under the following conditions:
• NO x 400 ppm (50% N0 + 50% NO2)
• VVH Hourly Volumetric Velocity
• Temperature programming from 180 to 500 ° C with a temperature rise rate of 5 ° C per minute.
• composition of the gases leaving the catalytic reactor is measured by -
• Table 1 NOx Conversion as a Function of Temperature for Catalysts A and B The results reported in Table 1 show that the catalyst B according to the invention is more efficient in reducing NOx than the catalyst A according to the prior art.

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• 2009
  • 2009-11-04 FR FR0957784A patent/FR2952123B1/fr active Active
• 2010
  • 2010-10-21 WO PCT/FR2010/052249 patent/WO2011055053A1/fr active Application Filing
  • 2010-10-21 EP EP10785156A patent/EP2496801A1/de not_active Withdrawn

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