Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/033—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
  • 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
• • 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
  • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
  • B01D53/86—Catalytic processes
  • B01D53/8621—Removing nitrogen compounds
  • B01D53/8625—Nitrogen oxides
• • 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
  • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
  • B01D53/86—Catalytic processes
  • B01D53/90—Injecting reactants
• • 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
• • 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
  • 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
  • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
• • 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
• • 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
  • F01N3/08—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
• • 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
• • 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
  • B01D2251/206—Ammonium compounds
• • 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
  • B01D2251/2062—Ammonia
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2251/00—Reactants
  • B01D2251/20—Reductants
  • B01D2251/208—Hydrocarbons
• • 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
  • B01D2255/20753—Nickel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2255/00—Catalysts
  • B01D2255/90—Physical characteristics of catalysts
  • B01D2255/906—Catalyst dispersed in the gas
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2257/00—Components to be removed
  • B01D2257/40—Nitrogen compounds
  • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
• • 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
  • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
  • F01N2570/10—Carbon or carbon oxides
• • 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
  • F01N2570/12—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
  • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
  • F01N2570/14—Nitrogen oxides
• • 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
  • F01N2610/01—Adding substances to exhaust gases the substance being catalytic material in liquid form
• • 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
  • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
• • 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
  • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
• • 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
  • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
• • 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

• the present invention relates to a product for the depollution of exhaust gases, in particular of an internal combustion engine, in particular for a motor vehicle, and an exhaust gas depollution process using this product. It relates more particularly to a process for treating the pollutants contained in the exhaust gases of a diesel-type internal combustion engine, especially for a motor vehicle, but in no way rules out such a process for spark ignition engines, such as those operating with a gaseous fuel or with gasoline, and in particular with a lean mixture.
• the exhaust gases of these engines contain numerous pollutants, such as unburned hydrocarbons (HC), carbon monoxide, nitrogen oxides (NO and NO 2 ), more commonly known as NOx, and in addition to the particles.
• pollutants such as unburned hydrocarbons (HC), carbon monoxide, nitrogen oxides (NO and NO 2 ), more commonly known as NOx, and in addition to the particles.
• NOx is the result of combustion that takes place at high temperatures and in the presence of oxygen. These conditions are generally encountered in all types of combustion, particularly those taking place in lean mixture, such as those with direct injection lean mixture, regardless of the fuel used.
• NOx has a major disadvantage because it has a direct negative impact on the health of humans, particularly NO 2 , and indirectly by the secondary formation of tropospheric ozone.
• NO 2 a direct negative impact on the health of humans
• tropospheric ozone In order to meet pollutant emission standards and to preserve the environment and human health, it has become necessary to treat these pollutants before releasing the exhaust gases into the atmosphere. As is generally known, this is achieved by a treatment in pollution of the exhaust gas flowing in the exhaust line of the engine.
• catalyst means such as an oxidation catalyst, are placed on the exhaust line.
• a particulate filter is advantageously placed on this line so as to capture and then eliminate the particles present in the exhaust gases and thus prevent them are released into the atmosphere.
• This filter which may also be a catalyzed filter, must be periodically regenerated so that it retains all its filtration capacity by producing a combustion of particles retained in this filter.
• These regeneration operations consist mainly of an increase in the temperature of the filter, which can either occur spontaneously during use of the high-load engine, or be generated by means of exothermic oxidation on a catalyst placed upstream of the filter. reducing chemical species resulting from combustion or an injection directly to the exhaust triggered by the engine control.
• the exhaust gases also pass through other means of catalysis, in particular catalytic catalysts of the SCR type (for Selective Catalytic Reduction).
• This SCR catalyst selectively reduces NOx to nitrogen by the action of a reducing agent.
• This reducing agent which is generally injected upstream of the SCR catalyst, may be ammonia or a compound generating ammonia by decomposition, such as urea, or be a hydrocarbon originating from an oxygenated or non-oxygenated hydrocarbon substance. .
• the urea solution is injected into the exhaust line upstream of the SCR catalyst.
• the water contained in this solution is quickly vaporized under the effect of the temperature of the exhaust gas, then each molecule of urea decomposes in two steps into two molecules of ammonia:
• ammonia can be directly injected in the gaseous state into the exhaust line upstream of the SCR catalyst.
• the system for decontaminating exhaust gas comprises an exhaust line comprising a depollution means combining a particulate filter and a catalyst with selective catalytic reduction (SCR), this set being called catalyzed filter RCS or FRCS filter, a single tank containing a mixture of an additive for the regeneration of the particulate filter and a reducing agent for the removal of NOx present in this means of depollution and an injector for introducing this mixing upstream of the FRCS filter.
• SCR selective catalytic reduction
• EP 2 541 012 is limited to using a regeneration additive containing an oxygen storage capacity.
• Such an additive has little advantage in a medium already rich in oxygen, as is the case for an engine exhaust line operating lean mixture.
• the catalytic phase of the SCR catalyst is protected only when it is coated in a particulate filter. This excludes those configurations for which the functions of particle filtration and catalytic reduction of NOx by SCR are carried out on dissociated elements.
• the system described only relates to situations for which the temperature of the exhaust gas is high.
• the combustion of the particles is likely to further increase the temperature within the FRCS filter, which can lead to deterioration of the catalytic phase.
• the present invention proposes to overcome the aforementioned drawbacks by means of a product and a process which make it possible to carry out the depollution of the exhaust gases in a simple and effective manner.
• the present invention relates to a product for the depollution of exhaust gas, in particular of an internal combustion engine, said product being a mixture of an additive for the treatment of particles and a reducing agent for elimination.
• nitrogen oxides (NOx) characterized in that the product comprises a mixture of a reducing agent containing ammonia or an ammonia generating compound by decomposition, or a hydrocarbon derived from an oxygenated hydrocarbon substance or no, and an additive to catalyze the oxidation of particles.
• the product may comprise at least one metal compound.
• the metal compound may be an organometallic compound.
• the metal compound may be a metal selected from the elements sodium, potassium, magnesium, calcium, barium, strontium, titanium, cerium, chromium, molybdenum, manganese, iron, rubidium, cobalt, rhodium, nickel, palladium, platinum, copper, silver or is a mixture of at least two of these elements.
• the organometallic compound may include ferrocene.
• the metal compound may be an inorganic metal compound.
• the inorganic metal compound may be a compound chosen from fluorides, chlorides, bromides, iodides, oxides, nitrates, sulphates, phosphates, hydrides, carbonates, nitrides or a mixture of at least two of these compounds.
• the invention also relates to a process for the depollution of exhaust gases circulating in an exhaust line, in particular an internal combustion engine, and using the product as mentioned above, said line comprising a catalytic converter means.
• selective catalytic reduction of nitrogen oxides (NOx) a means for removing particles, and means for introducing the product into the exhaust line, characterized in that it consists of:
• the method may include regularly introducing the product into the exhaust line.
• the method may include controlling the flow rate of the injected product as a function of the amount of NOx.
• the method may comprise combining, in a single element, the selective catalytic reduction catalytic reduction means of the nitrogen oxides and the particulate removal means into a catalyzed SCR filter.
• the method may include placing the catalytically selective catalytic reduction means of the nitrogen oxides in front of the particulate removal means.
• the method may include placing the particulate removal means in front of the catalytically selective catalytic reduction means of the nitrogen oxides.
• the method may include placing at least one additional catalyst in the exhaust line.
• FIG. 2 which illustrates a first variant of FIG.
• This exhaust gas depollution treatment plant comprises an exhaust line 10 conveying the exhaust gas of an internal combustion engine 12, for example for a motor vehicle.
• an internal combustion engine it is understood a diesel engine, but this does not exclude in any way all other internal combustion engines, such as engines running on gasoline or gas.
• the exhaust line 10 comprises, in the direction of flow of the exhaust gas from its inlet 14 in the vicinity of the exhaust manifold 1 6 of the engine to its outlet 18 to the air free, at least one means for capturing and removing the particles present in the exhaust gas and a NOx reduction means also contained in these gases.
• these means are combined into a single element which is better known as the catalyzed RCS 20 filter or FRCS filter.
• this FRCS filter 20 is placed downstream of an oxidation catalyst 22 whose function is to treat unburned hydrocarbons and carbon monoxide contained in the exhaust gases before they pass through the FRCS filter. .
• This oxidation catalyst 22 also has the function of partially converting nitric oxide to nitrogen dioxide, the ideal case being to have an equimolar distribution between the nitric oxide and the nitrogen dioxide at the inlet the FRCS filter to maximize its effectiveness.
• the exhaust line comprises an introduction means, preferably an injector 24, a mixture of an additive for the regeneration of the particles and a reducing agent for the removal of NOx.
• This injector is placed upstream of the FRCS filter and in the vicinity of its inlet 26 so that this mixture can combine as homogeneously as possible with the exhaust gases before their introduction into the FRCS filter.
• the line comprises a differential pressure determining means 28 between the inlet 26 of the FRCS filter and its outlet 30.
• this means comprises an upstream pressure sensor 32 placed at the inlet 26 of the FRCS filter and measuring the pressure of the exhaust gases at this inlet, another sensor 34, called a downstream sensor, placed at the output 30 of this FRCS filter and measuring the exhaust gas pressure at this output, and a calculator 36 for determining the pressure difference between the inlet and the outlet of the FRCS filter. This makes it possible to know the rate of clogging by the particles of the FRCS filter.
• the exhaust line carries a temperature sensor (not shown) placed on the exhaust line, and more particularly at the inlet of the FRCS filter, to know at any time the temperature of the gases. exhaust flowing in this line.
• a temperature sensor not shown
• it may be provided to use logic and / or computer means that can estimate at any time the temperature of the exhaust gas flowing in the line.
• This line may also carry a NOx sensor (not shown) placed at the output of the FRCS filter 20 to know at any time the amount of NOx coming out of the FRCS filter.
• the mixture introduced into the exhaust line by the injector 24 is fed through a conduit 38 connecting this injector to a reservoir 40 containing this mixture.
• This mixture is circulated between the reservoir and the injector under the effect of a pumping means, such as a metering pump 42.
• the mixture in the reservoir comprises a reducing agent for NOx, which may be ammonia or an ammonia generating compound by decomposition, such as urea, or which may be a hydrocarbon derived from a hydrocarbon substance oxygenated or not, and a catalytic type additive for the treatment of particles and more particularly an additive for catalyzing the oxidation of these particles.
• a reducing agent for NOx which may be ammonia or an ammonia generating compound by decomposition, such as urea, or which may be a hydrocarbon derived from a hydrocarbon substance oxygenated or not
• a catalytic type additive for the treatment of particles and more particularly an additive for catalyzing the oxidation of these particles.
• the catalytic type additive for the treatment of the particles may be a metal compound.
• This metal compound may be an organometallic compound, such as, for example, ferrocene.
• the metal of this organometallic compound may be sodium, potassium, magnesium, calcium, barium, strontium, titanium, cerium, chromium, molybdenum, manganese, iron, rubidium, cobalt, rhodium, nickel, palladium, platinum, copper, silver or a mixture of at least two of these elements.
• This metal compound may be an inorganic metal compound, such as, for example, nickel chloride. More generally, this inorganic metal compound may be part of the family of fluorides, chlorides, bromides, iodides, oxides, nitrates, sulphates, phosphates, hydrides, carbonates, nitrides or a mixture of these compounds.
• the engine computer that usually includes any engine knows at any time the temperature of the exhaust gas and the amount of NOx output of the FRCS filter.
• the mixture contained in the tank 30 is introduced regularly into the exhaust line by the injector 24 upstream of the FRCS filter.
• the amount of the mixture injected into the exhaust line is substantially proportional to the formation of NOx and is determined by the engine computer.
• FIG. 2 differs from FIG. 1 in that the FRCS filter of FIG. 1, which is in a single element, is replaced by at least two exhaust gas treatment means.
• One of the means is a catalyst of the SCR catalyst type 44 which is followed by another means which is a particulate filter 46.
• the injector 24 is placed upstream of the catalyst
• one of the means is a particulate filter 46 which is followed by another means which is a catalyst of the SCR 44 catalyst type.
• the injector 24 is upstream of the particulate filter 464.
• the exhaust line comprises, for the variant of FIG. 2 as well as that of FIG. 3, an injector 24 of the mixture described above comprising an additive for the regeneration of the particles of the particulate filter and a reducing agent for the NOx removal by the RCS 44 catalyst
• This injector is placed upstream of the exhaust gas treatment means (RCS 44 catalyst or a particle filter 46) closest to the oxidation catalyst 22.
• the exhaust line comprising the FRCS filter 20 or the exhaust line comprising a SCR catalyst 44 and a particulate filter 46 may comprise additional catalysts, for example an SCR catalyst in addition to the FRCS filter, and / or a clean catalyst -up, etc.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Combustion & Propulsion (AREA)
• Health & Medical Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Environmental & Geological Engineering (AREA)
• Biomedical Technology (AREA)
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• General Chemical & Material Sciences (AREA)
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• Exhaust Gas After Treatment (AREA)

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• 2014
  • 2014-12-11 FR FR1462228A patent/FR3029800B1/fr active Active
• 2015
  • 2015-12-01 CN CN202110789433.XA patent/CN113356972A/zh not_active Withdrawn
  • 2015-12-01 WO PCT/EP2015/078199 patent/WO2016091657A1/fr active Application Filing
  • 2015-12-01 EP EP15802125.3A patent/EP3229941A1/de active Pending
  • 2015-12-01 US US15/534,974 patent/US10167758B2/en active Active
  • 2015-12-01 CN CN201580067240.6A patent/CN107002529A/zh active Pending

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