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
  • F01N3/2066—Selective catalytic reduction [SCR]
• • 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
• • 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
  • B01D53/9459—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
  • 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
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
  • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
  • F01N3/106—Auxiliary oxidation catalysts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • 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
  • B01D2251/206—Ammonium compounds
  • B01D2251/2067—Urea
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2255/00—Catalysts
  • B01D2255/10—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
  • B01D2255/10—Noble metals or compounds thereof
  • B01D2255/102—Platinum group metals
  • B01D2255/1023—Palladium
• • 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
  • B01D2255/1025—Rhodium
• • 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
  • B01D2255/20761—Copper
• • 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
  • B01D2258/00—Sources of waste gases
  • B01D2258/01—Engine exhaust gases
  • B01D2258/012—Diesel engines and lean burn gasoline engines
• • 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
• • 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
  • F01N2330/00—Structure of catalyst support or particle filter
  • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
• • 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
  • F01N2330/00—Structure of catalyst support or particle filter
  • F01N2330/06—Ceramic, e.g. monoliths
• • 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
  • F01N2370/04—Zeolitic material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • 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
  • 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
  • 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 an SCR (Selective Catalytic Reduction) catalyst composition having improved NO x conversion and a device for post-treating diesel engine exhaust gas using the same. More particularly, the present invention relates to an SCR catalyst composition which is capable of effectively converting NO x in diesel engine exhaust gas into harmless components, and to a device for emitting exhaust gas, which has an improved capability to purify diesel engine exhaust gas, in particular, NO x , using the catalyst composition.
• SCR Selective Catalytic Reduction
• a diesel engine having inherently high heat efficiency (i.e. high fuel economy) and high torque at low speed is useful as a device for providing driving force to a vehicle, and may be driven at a high A/F (air to fuel) ratio under conditions of dilute fuel mixture.
• the diesel engine exhibits high HC and CO conversions, but has high NO x and particulate emissions.
• NO x and particulates are diesel exhaust gas components difficult to convert into harmless components, and the emission standards related thereto are increasingly restricted because of associated environmental problems.
• various methods for removal of NO x are devised.
• an SCR catalyst system or a NO x adsorption (lean NO x trap) catalyst system may be proposed, but the present invention is directed to SCR techniques .
• FIG. 1 schematically shows an SCR system.
• the SCR reduces NO x into N 2 and H 2 O using ammonia or urea as a reducing agent as below.
• the SCR catalyst is exemplified by a V 2 O 5 /TiO 2 catalyst.
• the V 2 O 5 /TiO 2 catalyst is operated in the temperature range of 250 ⁇ 450 ° C.
• low- temperature performance of the catalyst is not ensured.
• the catalyst has improved performance and a wide low-temperature operating range.
• an oxidation catalyst is disposed upstream of the SCR system such that NO is oxidized into NO 2 to increase the concentration of NO 2 .
• FIG. 2 schematically shows the system of the reference patent. This system is configured such that an oxidation catalyst for converting NO of NO x generated from the engine into NO 2 , a particulate filter, a reducing agent injector, and an SCR catalyst are sequentially disposed. The SCR system thus configured is disclosed to exhibit NO x conversion of 80% or more.
• a V 2 O 5 ZWO 3 ZTiO 2 SCR catalyst is employed .
• the particulate filter for decreasing a particulate concentration is a catalyzed diesel particulate filter (CDPF) , called a catalyzed soot filter (CSF) .
• CDPF catalyzed diesel particulate filter
• CSF catalyzed soot filter
• this filter is configured such that particulates in exhaust gas are trapped and the filter is regenerated, and is exemplified by various known filter structures usable to trap particulates in diesel exhaust, including a honeycomb wall- flow filter for trapping particulates .
• the particulates trapped in the filter and accumulated thereon should be continuously or periodically combusted from the filter (for filter regeneration) . Accordingly, to lower the combustion temperature adapted therefor, a catalyst is provided, thus forming the CDPF.
• the CDPF or CSF may remove 90% or more of particulates, along with the regeneration of the filter following the passive combustion of particulates accumulated thereon.
• the present inventors have directed their attention to the problems of the SCR catalyst mentioned in the JMI patent in that 1) performance of an oxidation catalyst disposed upstream of the SCR catalyst should be concurrently considered because NO x conversion depends on the NO 2 /NO ratio and 2) NO x conversion is not efficient at low temperatures attributable to poor low-temperature activity of the SCR catalyst.
• the SCR catalyst is required to be newly designed.
• the present inventors have developed a novel SCR catalyst based on various catalyst design methods, and the SCR catalyst according to the present invention has been confirmed to exhibit superior low-temperature activity and thus effectively react even at the temperature of engine exhaust gas and as well achieve desired NO x conversion even in the absence of an oxidation catalyst.
• FIG. 3 schematically shows the device for emitting diesel engine exhaust gas according to the present invention.
• An object of the present invention is to provide an SCR catalyst composition having superior low-temperature activity and high NO x conversion. Thanks to the high NO x conversion of the SCR catalyst according to the present invention, use of an oxidation catalyst which should essentially be disposed upstream of the conventional SCR catalyst may be excluded.
• Another object of the present invention is to provide a device for emitting diesel engine exhaust gas which uses the SCR catalyst having superior low-temperature activity and high NO x conversion.
• the present invention provides a device for emitting diesel engine exhaust gas, composed of an SCR catalyst module disposed downstream of a diesel engine and including an injector, an oxidation catalyst module disposed downstream of the SCR catalyst module, and a CSF module, all of which are successively arranged in series.
• the SCR catalyst composition according to the present invention includes Cu or Fe-containing zeolite impregnated with one or a combination of two selected from the group consisting of Pt, Pd and Rh; or Cu, Fe or Si-containing alumina impregnated with one or a combination of two selected from the group consisting of Pt, Pd and Rh.
• the SCR catalyst can exhibit high NO x conversion at low temperatures, regardless of the N ⁇ 2 /NO x ratio which is optionally adjusted by a conventional diesel oxidation catalyst.
• the use of such a SCR catalyst enables the flexible design of a diesel engine exhaust system.
• FIG. 1 schematically shows an SCR system
• FIG. 2 schematically shows a diesel engine exhaust system in a conventional JMI patent
• FIG. 3 shows a diesel engine exhaust system according to the present invention
• FIG. 4 shows a graph of NO x conversions of the comparison catalysts and the novel catalyst composition according to the present invention.
• the exhaust system is configured such that an SCR catalyst module, a diesel oxidation catalyst (DOC) module and a CSF module are successively arranged in series, as shown in FIG. 3.
• DOC diesel oxidation catalyst
• CSF CSF
• the ⁇ module' indicates a device of a minimal unit for performing a single function.
• the ⁇ CDPF module' indicates a filter device for trapping particulates emitted from a diesel engine
• the ⁇ DOC module' indicates a carrier coated with so-called DOC for oxidizing HC or CO emitted from the diesel engine into harmless components.
• a device for emitting diesel engine exhaust gas includes an SCR catalyst module for receiving exhaust gas emitted from a diesel engine to convert NO x in the exhaust gas using a reducing agent which is introduced through a lateral side of the module, a DOC module disposed downstream of the SCR catalyst module to oxidize HC and CO, and a CSF module for trapping particulates, all of which are successively arranged in series .
• SCR Catalyst Module for receiving exhaust gas emitted from a diesel engine to convert NO x in the exhaust gas using a lateral side of the module
• DOC module disposed downstream of the SCR catalyst module to oxidize HC and CO
• CSF module for trapping particulates
• the SCR catalyst improved according to the present invention includes Cu or Fe-containing zeolite impregnated with one or a combination of two selected from the group consisting of Pt, Pd and Rh; or Cu, Fe or Si-containing alumina impregnated with one or a combination of two selected from the group consisting of Pt, Pd and Rh.
• a catalyst is applied on a carrier made of ceramic such as cordierite or fireproof metal such as stainless steel, thus forming the SCR catalyst module.
• a typical example of the carrier includes a flow-through type carrier having a plurality of fine channels extending between opposite sides thereof and thus communicating the opposite sides with each other.
• the SCR catalyst module includes a known injector disposed upstream thereof to spray a reducing agent.
• the injector may include a pump and an injection nozzle for spraying urea or ammonia acting as a reducing agent .
• the SCR catalyst composition used in the present invention may be prepared by impregnating 5-10 wt% Cu-containing zeolite with 0.5 wt% or less Pt, thus preparing a slurry, coating a cordierite- and metal-made carrier with the slurry, and then performing drying and burning.
• 5 ⁇ 10 wt% Fe-containing zeolite may be impregnated with Pt in the same amount by weight.
• alumina may be used as a support. As such, the alumina may be alumina containing Cu, Fe or Si.
• the novel SCR catalyst according to the present invention can be confirmed to considerably improve the conversion.
• the DOC oxidizes HC and CO in diesel engine exhaust gas and thus converts them into harmless components, removes 50 ⁇ 80% of a soluble organic fraction of particulate matter (PM) , and lessens diesel odor and black smoke.
• a catalyst Pt or Pd is used, and for example, a Pt/AlS ⁇ 3 catalyst is known as a typical DOC catalyst.
• a known module may be employed.
• a typical diesel particulate module is a filter for trapping PM emitted from a diesel engine, and includes for example, various known filter structures, such as a ceramic monolith filter, a ceramic fiber filter, and a sintered metal filter. Particularly useful is a ceramic monolith filter, called a ceramic wall-flow filter composed of porous ceramic such as cordierite. This filter has a plurality of channels in which each of the channels is closed at one end thereof such that opposite inlet and outlet ends of the channels are alternately closed.
• the exhaust gas introduced into one channel through an inlet end thereof passes through a porous wall between the channel and the adjacent channel and enters the adjacent channel, and then the exhaust gas is discharged to the outside through the outlet end of the adjacent channel, because the one channel is closed at the outlet end opposite the inlet end.
• the PM is trapped in the channels. Because the pore size of the porous wall of the filter has a direct influence on a diameter of trapped PM and engine back pressure, it is regarded as important for selecting the type of module.
• the PM trapped in the filter is ignited within as short a time as possible and the filter is regenerated to a state in which it can trap PM again.
• a CRT Continuous Regeneration Trap
• DPX DPX module
• the usable module is exemplified by CSF 12 composed of 250 g/ft 3 ZrO 2 , 500 g/ft 3 CeO 2 , 75 g/ft 3 Pt, available from ENGELHARD.
• CSF 12 composed of 250 g/ft 3 ZrO 2 , 500 g/ft 3 CeO 2 , 75 g/ft 3 Pt, available from ENGELHARD.
• DOC catalyst used in the present invention a known module may be employed.

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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)
• Toxicology (AREA)
• Materials Engineering (AREA)
• Biomedical Technology (AREA)
• Environmental & Geological Engineering (AREA)
• Analytical Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Exhaust Gas After Treatment (AREA)

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• 2008
  • 2008-08-05 KR KR1020080076607A patent/KR101011760B1/ko active IP Right Grant
  • 2008-08-06 WO PCT/KR2008/004572 patent/WO2010016631A1/en active Application Filing
  • 2008-08-06 EP EP08793086A patent/EP2318674A1/de not_active Withdrawn
  • 2008-08-06 US US13/056,284 patent/US20110126525A1/en not_active Abandoned

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