US20080124264A1 - Oxidation Catalyst and Exhaust-Gas Purification System Using the Same - Google Patents

Oxidation Catalyst and Exhaust-Gas Purification System Using the Same Download PDF

Info

Publication number
US20080124264A1
US20080124264A1 US11/946,620 US94662007A US2008124264A1 US 20080124264 A1 US20080124264 A1 US 20080124264A1 US 94662007 A US94662007 A US 94662007A US 2008124264 A1 US2008124264 A1 US 2008124264A1
Authority
US
United States
Prior art keywords
exhaust gas
catalyst
exhaust
oxidation catalyst
reducing agent
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.)
Abandoned
Application number
US11/946,620
Other languages
English (en)
Inventor
Masanori Ikeda
Naohiro Kato
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.)
ICT Co Ltd
International Catalyst Technology Inc
Original Assignee
ICT Co Ltd
International Catalyst Technology Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39148612&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20080124264(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ICT Co Ltd, International Catalyst Technology Inc filed Critical ICT Co Ltd
Assigned to INTERNATIONAL CATALYST TECHNOLOGY, INC., ICT CO., LTD. reassignment INTERNATIONAL CATALYST TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IKEDA, MASANORI, KATO, NAOHIRO
Publication of US20080124264A1 publication Critical patent/US20080124264A1/en
Priority to US12/656,799 priority Critical patent/US8034311B2/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/44—Palladium
    • 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
    • B01J35/19—
    • 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
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0027—Powdering
    • B01J37/0036—Grinding
    • 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
    • B01J37/0248—Coatings comprising impregnated particles
    • 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
    • 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
    • B01D2251/2062—Ammonia
    • 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
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • 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
    • 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
    • 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
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/74—Iron group metals
    • B01J23/745—Iron
    • B01J35/56—
    • B01J35/60—
    • 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
    • B01J37/0246—Coatings comprising a zeolite
    • 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
    • F01N2240/40—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 hydrolysis catalyst
    • 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
    • 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
    • F01N2370/04—Zeolitic material
    • 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 oxidation catalyst and an exhaust-gas purification system using the same, and in particular, to an exhaust-gas purification system having excellent performance in purifying particularly nitrogen oxides from an internal combustion engine such as a diesel engine.
  • a method of making use of plasma is known as a technology for forming NO 2 .
  • a method for decreasing particulate matters in an exhaust gas by using nitrogen dioxide and ozone formed by means of generating plasma in the exhaust gas is disclosed (US-A-2004-168429 (JP-A-2004-169643)).
  • Another technology for forming NO 2 is a technology of using an oxidation catalyst to promote the reaction of the above formula (5).
  • platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh) and the like are proposed as a active component of a catalyst for oxidizing NO in the exhaust gas to NO 2 in pursuit of removing diesel particulates (particulate matters) in U.S. Pat. No. 4,902,487 (JP-A-1-318715).
  • JP-A-1-318715 Specific data on the metals other than Pt, however, are not disclosed.
  • Pat. No. 4,902,487 or US-A-2002-039550 is used that sufficient effect for purifying nitrogen oxides and particulate matters has not been obtained.
  • the temperature of exhaust gases is low, it has been necessary in a conventional method to elevate the temperature of the exhaust gas, which sometimes has made a system complicated.
  • an object of the present invention is to provide an oxidation catalyst for efficiently promoting oxidation of NO to NO 2 even in a low temperature range.
  • Another object of the present invention is to provide an exhaust-gas purification system and method for efficiently removing nitrogen oxides or particulate matters even in a low temperature range.
  • the present inventors have found, after having intensively studied a way to solve the above problem, that an oxidation catalyst containing platinum and palladium as catalytically active components which contains 1 to 55% by weight of the palladium relative to 100% by weight of the platinum, efficiently promotes oxidation of NO to NO 2 even in a low temperature range, and completed the present invention.
  • the present invention provides an oxidation catalyst comprising platinum and palladium as catalytically active components, which promotes oxidation of nitrogen monoxide to nitrogen dioxide, wherein the oxidation catalyst comprises 1 to 55% by weight of the palladium relative to 100% by weight of the platinum.
  • the present invention provides an exhaust-gas purification system, which comprises an oxidation catalyst containing platinum and palladium as catalytically active components and promoting oxidation of nitrogen monoxide to nitrogen dioxide which contains 1 to 55% by weight of the palladium relative to 100% by weight of the platinum, in the exhaust-gas passage of an internal-combustion engine.
  • the present invention provides an exhaust-gas purification method for purifying the exhaust gas discharged from an internal-combustion engine, having (1) a step for converting nitrogen monoxide in the exhaust gas to nitrogen dioxide by bringing the exhaust gas into contact with an oxidation catalyst containing platinum and palladium as catalytically active components which contains 1 to 55% by weight of the palladium relative to 100% by weight of the platinum, and (2) a step for reducing the nitrogen oxides in the exhaust gas by bringing the exhaust gas obtained in the step (1) into contact with a NO X reduction catalyst in the presence of a reducing agent.
  • the present invention provides an exhaust-gas purification method for purifying the exhaust gas discharged from an internal-combustion engine, having (1) a step for converting nitrogen monoxide in the exhaust gas to nitrogen dioxide by bringing the exhaust gas into contact with an oxidation catalyst containing platinum and palladium as catalytically active components which contains 1 to 55% by weight of the above palladium relative to 100% by weight of the platinum, (2) a step for reducing the nitrogen oxides in the exhaust gas by bringing the exhaust gas obtained in the step (1) into contact with a NO X reduction catalyst in the presence of a reducing agent, and (3) a step for removing at least a part of particulate matters.
  • the oxidation catalyst of the present invention can form NO 2 even when an exhaust gas is at low temperature, it can efficiently promote a reaction of a substance to be reacted with NO 2 even when an exhaust gas is at low temperature.
  • FIG. 1 is a drawing showing the result of Evaluation Example 1.
  • FIG. 2 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • FIG. 3 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • FIG. 4 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • FIG. 5 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • FIG. 6 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • FIG. 7 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • FIG. 8 is a schematic drawing showing an example of the exhaust-gas purification system of the present invention.
  • the first aspect of the present invention is an oxidation catalyst containing platinum and palladium as catalytically active components and promoting oxidation of nitrogen monoxide to nitrogen dioxide, which is characterized by containing 1 to 55% by weight of the above palladium relative to 100% by weight of the above platinum.
  • Pt, Pd, Ru, Rh and the like are disclosed as a catalytically active component for promoting oxidation of NO to NO 2 , for example, in U.S. Pat. No. 4,902,487.
  • Pt has been usually used as an active component for forming NO 2 , because Pd used alone as a catalytically active component has much poorer oxidation activity compared with Pt used alone as described in “Barry J. Cooper, et al., Role of NO in Diesel Particulate Emission Control, SAE paper, 890404”.
  • the present invention has found that a catalyst made of a combination of Pt and Pd has a synergistic effect on promotion of nitrogen dioxide formation and also has found the range where an oxidation catalyst functions effectively by specifying contents of the Pt and Pd even under a low temperature condition.
  • the oxidation catalyst has an adequate activity after the oxidation catalyst is used for a long period.
  • the ratio of the contents of Pt and Pd by weight is 1 to 55% by weight of Pd relative to 100% by weight of Pt. Further, it is preferably that the ratio of the contents of Pt and Pd by weight is 1 to 45% by weight, 1 to 35% by weight, 1 to 20% by weight, 4 to 20% by weight, 4 to 12% by weight, 5 to 12% by weight of Pd relative to 100% by weight of Pt, in this order.
  • An oxidation catalyst containing these ranges of Pt and Pd promotes conversion of NO to NO 2 very efficiently even in a low temperature range.
  • the amount (sum) of Pt and Pd to be used is preferably 0.1 to 20 g, more preferably 0.5 to 10 g per liter of a three-dimensional structure. This range of the amount gives excellent catalyst activity in initial and endurance operation.
  • the oxidation catalyst of the present invention may contain other metals and oxides thereof as catalytically active components as long as the catalyst contains Pt and Pd at the above specified ratio.
  • the metal includes specifically a metal such as ruthenium, rhodium, iridium, gold, cobalt, nickel and copper, and an alloy thereof, and the like.
  • the content of other metals and oxides thereof is usually 0 to 2000% by weight relative to 100% by weight of catalytically active components.
  • the oxidation catalyst of the present invention has a structure where a catalytically active component is supported on a refractory inorganic oxide to form a catalytically active component-supporting inorganic oxide which is further supported on a three-dimensional structure.
  • the catalytically active component which is supported on a refractory inorganic oxide is not particularly limited, and preferably is present in the state of catalyst metal particles having a mean particle diameter of preferably 1 to 50 nm.
  • the refractory inorganic oxide to be used in the present invention is not particularly limited as long as it is usually used as a catalyst carrier, and includes activated alumina such as ⁇ -, ⁇ -, ⁇ -, ⁇ - and ⁇ -alumina; zirconia, titania, zeolite, silica; or a composite oxide of these oxides such as alumina-silica, alumina-titania, alumina-zirconia and titania-zirconia. From the standpoint of improving catalyst performance, activated alumina, alumina-silica, zirconia, titania and zeolite are preferable and activated alumina is more preferable.
  • the above inorganic oxide may be used alone or in combination of two or more.
  • the shape of the refractory inorganic oxide is a powder.
  • the amount of the refractory inorganic oxide (excluding active components) to be used is preferably 10 to 300 g, more preferably 20 to 150 g per liter of a three-dimensional structure. This range of the amount gives sufficient dispersion of a noble metal and satisfactory durability.
  • the BET specific surface area of the refractory inorganic oxide is preferably 50 to 750 m 2 /g, more preferably 150 to 750 m 2 /g.
  • the mean primary particle diameter of the refractory inorganic oxide powder is 0.5 to 150 ⁇ m, preferably 1 to 100 ⁇ m.
  • the three-dimensional structure to be used in the present invention includes a heat-resistant carrier such as a honeycomb carrier, and particularly, a honeycomb structure of an integrally molded type is preferable, for example, a monolithic honeycomb carrier, a metal honeycomb carrier, a plug honeycomb carrier and a pellet carrier are included.
  • the monolithic carrier includes a carrier that is usually called a ceramic honeycomb carrier, and particularly, a honeycomb carrier made of material such as cordierite, mullite, ⁇ -alumina, zirconia, titania, titanium phosphate, aluminum titanate, betallite, spondumene, aluminosilicate, magnesium silicate is preferable, and cordierite-base is particularly preferable among these.
  • a three-dimensional structure made of a heat-resistant metal of oxidation resistance such as stainless steel and a Fe—Cr—Al alloy is used.
  • These monolithic carriers are manufactured by an extrusion molding method, a method of rolling up a sheet-shaped element, and the like.
  • the shape of a gas passage may be any of a hexagon, a quadrangle, a triangle and a corrugated shape.
  • the carrier having a cell density (number of cell/cross-sectional area) of 100 to 600 cells/square inch can be satisfactorily used, and preferably 200 to 500 cells/square inch.
  • the oxidation catalyst of the present invention may contain an alkaline metal such as potassium, an alkaline-earth metal such as magnesium and barium, a rare-earth metal such as lanthanum and cerium, and an metal oxide thereof, or zeolite, and the content thereof is usually 0 to 100 g per liter of a three-dimensional structure.
  • the production method for the oxidation catalyst of the present invention is not particularly limited, and will be described below with specific examples.
  • inorganic salts such as a chloride (halide), a nitrate, a sulfate, an ammonium salt, an amine, a carbonate, a bicarbonate, a nitrite and an oxalate of Pt and Pd; a carboxylate such as a formate, a hydroxide, an alkoxide, and an oxide of Pt and Pd; preferably a chloride, a nitrate, an ammonium salt, an amine and a carbonate are prepared.
  • the active component is Pt
  • dinitrodiammine platinate nitrate, chloroplatinic acid (hexachloroplatinic acid), platinum nitrate and the like are included
  • the active component is Pd
  • palladium nitrate, palladium chloride are included.
  • the above raw material and a refractory inorganic oxide powder are subjected to wet milling to prepare an aqueous slurry.
  • a three-dimensional structure is coated with the slurry, dried usually at 50 to 150° C. for 30 minutes to 8 hours and then calcined at usually 300 to 800° C., preferably 400 to 600° C.
  • oxidation catalyst having a metal-particle diameter of a catalytically active component of 1 to 50 nm gives excellent oxidation performance.
  • the oxidation performance of the oxidation catalyst having a metal-particle diameter smaller than 1 nm is undesirably impaired due to interaction with a carrier, whereas the oxidation catalyst having a metal-particle diameter larger than 50 nm has undesirably less metal surface area resulting in less numbers of metal atoms to be used for catalytic reaction.
  • the second aspect of the present invention is an exhaust-gas purification system wherein the oxidation catalyst of the first aspect of the present invention is installed in the exhaust-gas passage of an internal-combustion engine. Since the oxidation catalyst of the first aspect of the present invention efficiently converts NO to NO 2 even in a low temperature range as described above, the exhaust-gas purification system of the second aspect of the present invention can efficiently remove nitrogen oxides even under a low temperature condition.
  • FIG. 2 is a schematic drawing showing an embodiment of the exhaust-gas purification system of the second aspect of the present invention.
  • the exhaust-gas purification system shown in FIG. 2 is equipped with an oxidation catalyst 2 installed in the exhaust-gas passage of an internal-combustion engine, a apparatus (reducing agent injection nozzle 8 , pump 9 , reducing agent tank 10 ) supplying a reducing agent to latter stage of the oxidation catalyst, and a NO X reduction catalyst 3 in the exhaust-gas passage at latter stage of the reducing agent supplying apparatus.
  • the internal-combustion engine 1 and the pump 9 are controlled by a controller 4 .
  • a temperature controller is composed of the controller 4 and thermocouples 5 to 7 .
  • the exhaust gas discharged from the internal-combustion engine 1 is introduced through the exhaust-gas passage to the oxidation catalyst 2 installed in the exhaust-gas passage.
  • the exhaust gas contains NO and NO 2 as nitrogen oxides, most of which is NO under a low temperature condition.
  • the reducing agent stored in the reducing agent tank 10 is then supplied from the reducing agent injection nozzle 8 to the exhaust-gas passage with actuation of the pump 9 .
  • Ammonia, urea, a hydrocarbon such as light oil, an alcohol of 1 to 3 carbon atoms and an ether of 2 to 6 carbon atoms can be used as the reducing agent, but from the standpoint of handling, preferably at least one selected from urea, light oil, dimethyl ether, methane, ethane, propane, hexane, ethylene, propylene, hexene, gasoline, kerosene, fuel oil A (JIS), fuel oil C (JIS), methanol, ethanol and propanol, more preferably at least one kind selected from urea, ammonia, light oil, dimethyl ether, methanol, ethanol and propanol, still more preferably urea, light oil, dimethyl ether and ethanol, and particularly preferably urea and light oil are used.
  • JIS fuel oil A
  • JIS fuel oil C
  • methanol, ethanol and propanol more preferably at least one kind selected from urea, ammonia, light oil,
  • a catalyst for hydrolyzing urea 14 is installed downstream as shown in FIG. 3 or the NO X reduction catalyst to be described later has a function for hydrolyzing urea.
  • urea water is injected from the injection nozzle 8 as shown in FIG. 3 .
  • the temperature controller composed of the controller 4 and the thermocouples 5 to 7 shown in FIG. 2 can control the temperature of the exhaust gas at each stage.
  • the temperature of the exhaust gas may be controlled to be preferably 140° C. or higher, more preferably 160° C. or higher before the exhaust gas is introduced to the oxidation catalyst 2 .
  • the temperature of the exhaust gas is controlled to be preferably 135° C. or higher, more preferably 160° C. or higher before the exhaust gas is introduced to the reduction catalyst 3 .
  • thermal decomposition of urea represented by the following formula (6) or hydrolysis of isocyanic acid, which is generated by the thermal decomposition of urea, represented by the following formula (7) proceeds easily.
  • the temperature of the exhaust gas before the exhaust gas is introduced to the NO X reduction catalyst 3 is preferably the boiling point of the hydrocarbon or higher.
  • the temperature of the exhaust gas is controlled to be preferably 200° C. or higher, more preferably 250 to 550° C. In such a temperature range, preferably, the liquid hydrocarbon hardly sticks to the surface of the reduction catalyst leading to efficient removal of NO X .
  • the NO X reduction catalyst is not particularly limited as long as it is usually known, and may be selected as appropriate according to the vehicle weight, the engine displacement and the like, to be mounted.
  • the reducing agent is urea
  • a zeolite catalyst exchanged by a specific transition metal is preferably used.
  • the reducing agent is a hydrocarbon such as light oil, an alcohol of 1 to 3 carbon atoms and an ether of 2 to 6 carbon atoms
  • a noble metal such as Pt, Pd and Rh supported on an inorganic carrier such as alumina, silica and alumina-silica is preferably used in a low temperature range of 300° C. or lower
  • a zeolite catalyst exchanged by a specific transition metal is preferably used in a high temperature range of 300° C. or higher.
  • the zeolite catalyst exchanged by a transition metal is preferably supported on a three-dimensional structure.
  • the three-dimensional structure the structure described in column of the above oxidation catalyst can be used.
  • the transition metal is not limited, and includes copper, iron, cerium, vanadium, chromium, nickel and oxides thereof, preferably copper, iron, vanadium and oxides thereof.
  • the amount of the transition metal to be used is preferably 1 to 80 g, more preferably 2 to 40 g per liter of a three-dimensional structure. This range of the amount gives excellent catalyst activity in initial and endurance operation.
  • the zeolite catalyst exchanged by a transition metal includes not only the zeolite having the form where a transition metal is ion exchanged, but also the zeolite having both of the form where a transition metal is ion exchanged and the form where a transition metal is coated.
  • the above amount of the transition metal to be used indicates the sum of the ion-exchanged transition metal and the transition metal coated on the zeolite.
  • the zeolite to be used is not particularly limited, and includes BEA type, MFI type, FER type, FAU type and MOR type zeolite, preferably BEA type and MFI type zeolite.
  • the amount of zeolite to be used is preferably 10 to 300 g, preferably 50 to 300 g per liter of a three-dimensional structure. This range of the amount gives sufficient dispersion of a transition metal and satisfactory durability.
  • the BET specific surface area of zeolite is preferably 50 to 750 m 2 /g, more preferably 150 to 750 m 2 /g.
  • the mean primary particle diameter of zeolite is preferably 0.5 to 150 ⁇ m, more preferably 1 to 100 ⁇ m.
  • the NO X reduction catalyst to be used in the present invention may contain an alkaline metal such as potassium, an alkaline-earth metal such as magnesium and barium, a rare-earth element such as lanthanum and cerium, and oxides thereof or zeolite.
  • the production method for the NO X reduction catalyst that can be used in the present invention is not particularly limited. As one example, a production method for a zeolite catalyst exchanged by a specific transition metal will be specifically described below.
  • a transition metal salt such as iron nitrate, iron acetate and iron sulfate is prepared as a raw material of a transition metal.
  • the above raw material and zeolite are then subjected to wet milling to prepare an aqueous slurry.
  • a three-dimensional structure is coated with this slurry, dried usually at 50 to 150° C. for 30 minutes to 8 hours and then calcined at 300 to 800° C., preferably 400 to 600° C. for 15 minutes to 2 hours, preferably 30 minutes to 1 hour to obtain a NO X reduction catalyst.
  • the purification system of the present invention includes various improved embodiments that use the oxidation catalyst of the first aspect of the present invention, preferably have a supplying apparatus of a reducing agent at the latter stage of the oxidation catalyst and further have a NO X reduction catalyst at the latter stage of the supplying apparatus of a reducing agent.
  • a catalyst of suppressing slip of a reducing agent 11 at the latter stage of the NO X reduction catalyst 3 FIG. 4
  • an embodiment having a diesel particulate filter 13 at the latter stage of the NO X reduction catalyst 3 FIG. 8
  • an embodiment including a diesel particulate filter 13 at the latter stage of the oxidation catalyst 2 FIG.
  • FIG. 5 an embodiment including a catalyst for hydrolyzing urea 14 ( FIG. 3 ) and a combination ( FIG. 6 and FIG. 7 ) of these embodiments are included.
  • Thermocouple 12 is installed after the NO X reduction catalyst 3 in the embodiment of FIG. 5 or FIG. 6 .
  • the reducing agent is urea or ammonia
  • an embodiment having a catalyst of suppressing slip of a reducing agent 11 installed as shown in FIG. 4 is preferable.
  • the catalyst of suppressing slip of a reducing agent indicates a catalyst for preventing discharge of extra ammonia, for which a conventionally known oxidizing catalyst can be used.
  • a diesel particulate filter can remove at least a part of particulate matters.
  • a fuel supplying apparatus composed of a fuel injection nozzle 17 , a pump 18 and a fuel tank 19 may be installed before the diesel particulate filter 13 as shown in FIG. 5 or FIG. 7 .
  • the filter requires processing for regeneration when particulates are accumulated.
  • the system of FIG. 7 is described as follows: Fuel is supplied from the fuel supplying apparatus to the oxidation catalyst 16 through the exhaust-gas passage and the temperature of the exhaust gas is controlled to be high enough to burn the particulates.
  • Thermocouple 15 is installed after the diesel particulate filter 13 in the embodiment of FIG. 7 .
  • the fuel necessary for regeneration of the diesel particulate filter may be supplied either to the exhaust-gas passage as shown above or before an exhaust-gas discharge step after fuel combustion in an engine cylinder.
  • the temperature of the exhaust gas to be introduced to the diesel particulate filter is not too low, specifically 200° C. or higher in view of regeneration of the diesel particulate filter.
  • Various kinds of diesel particulate filters are available and a known filter such as a filter made of cordierite and a filter made of heat-resistant silicon carbide can be used.
  • the diesel particulate filter may contain a catalyst component.
  • the catalyst component is not limited and includes one that at least one kind of catalytically active component such as platinum, palladium, rhodium, iridium, gold, silver, iron, copper and manganese is supported on a refractory inorganic oxide.
  • the refractory inorganic oxide includes activated alumina; zirconia, titania, zeolite, silica, ceria, magnesia, silica-alumina, ceria-zirconia, and the mixture thereof.
  • the amount of the catalytically active component is preferably 0.1-10 g per liter of the catalyst, and the amount of the refractory inorganic oxide is preferably 5-100 g per liter of the catalyst.
  • a catalyst of suppressing slip of a reducing agent and a catalyst for hydrolyzing urea that are conventionally known can be used.
  • the third aspect of the present invention is an exhaust-gas purification method for purifying an exhaust gas discharged from an internal-combustion engine.
  • the exhaust-gas purification method is characterized by comprising (1) a step for converting nitrogen monoxide in the exhaust gas to nitrogen dioxide by bringing the exhaust gas into contact with the oxidation catalyst of the first aspect of the present invention and (2) a step for reducing the nitrogen oxides in the exhaust gas by bringing the exhaust gas obtained in the step (1) into contact with a NO X reduction catalyst in the presence of a reducing agent.
  • the method comprises further (3) a step for purifying at least a part of particulate matters. The details of each step are as described above.
  • the oxidation catalyst of the present invention and the purification system using it can purify nitrogen oxides discharged from various internal-combustion engines such as a diesel engine, a gasoline engine and a compressed-natural-gas engine, and are preferably applied to a diesel engine among the above engines or to a vehicle driven by a diesel engine.
  • various internal-combustion engines such as a diesel engine, a gasoline engine and a compressed-natural-gas engine, and are preferably applied to a diesel engine among the above engines or to a vehicle driven by a diesel engine.
  • the calcination at 700° C. for 11 hours is a durable treatment for evaluating a catalyst performance after long-period use.
  • the conversion ratio of NO to NO 2 was calculated by the following equation and plotted against the temperature at the catalyst-bed inlet. The results are shown in FIG. 1 .
  • the oxidation catalyst of the present invention which contains a specific amount of Pd and Pt as catalytically active components shows a higher conversion ratio of NO to NO 2 than an oxidation catalyst which contains only Pt as a catalytically active component.
  • the aqueous slurry (F) was prepared in 15 times as many amounts by weight as that in Example 4.
  • a cylindrical honeycomb carrier made of cordierite of 10.5 inches in diameter and 6 inches in length having 300 cells per square inch of cross-sectional area was coated (wash coat) with this slurry so that the sum of platinum, palladium and alumina is 124 g per liter of the honeycomb carrier, dried at 120° C. for 8 hours and then calcined at 500° C. for an hour to obtain catalyst J.
  • the aqueous slurry (I) was prepared in 15 times as many amounts by weight as that in Comparative Example 3.
  • a cylindrical honeycomb carrier made of cordierite of 10.5 inches in diameter and 6 inches in length having 300 cells per square inch of cross-sectional area was coated (wash coat) with this slurry so that the sum of platinum and alumina is 124 g per liter of the honeycomb carrier, dried at 120° C. for 8 hours and then calcined at 500° C. for an hour to obtain catalyst K.
  • An aqueous solution of iron nitrate of the amount corresponding to 48 g of iron and 1,600 g of MFI type zeolite (BET specific surface area: 380 m 2 /g, mean primary particle diameter: 15 ⁇ m) were subjected to wet milling by a ballmill to prepare 4,500 g in total of an aqueous slurry (L).
  • a cylindrical honeycomb carrier made of cordierite of 10.5 inches in diameter and 6 inches in length having 400 cells per square inch of cross-sectional area was coated (wash coat) with this slurry so that the sum of iron and zeolite is 164.8 g per liter of the honeycomb carrier, dried at 120° C. for 8 hours and then calcined at 500° C. for an hour to obtain catalyst L.
  • An exhaust-gas discharge apparatus was fabricated by installing catalyst J after an engine 1 and reduction catalyst L after the catalyst as shown in FIG. 2 .
  • a direct-injection diesel engine of 9.8 L was used as the internal-combustion engine.
  • An exhaust-gas discharge apparatus was fabricated by installing catalyst K after an engine 1 and reduction catalyst L after the catalyst as shown in FIG. 2 .
  • a direct-injection diesel engine of 9.8 L was used as the internal-combustion engine.
  • An exhaust-gas discharge apparatus was fabricated in the same way as Comparative Example 5 except that a cylindrical honeycomb carrier made of cordierite of 10.5 inches in diameter and 6 inches in length having 300 cells per square inch of cross-sectional area was installed instead of catalyst K.
  • a direct-injection diesel engine of 9.8 L was used as the internal-combustion engine.
  • thermocouple 5 before the oxidation catalyst (the thermocouple 5 before the reduction catalyst in Comparative Example 6) indicated 400° C. and the exhaust gas was passed through the oxidation catalyst for 15 minutes. The engine was then run so that the thermocouple 5 before the oxidation catalyst indicates 180° C. on average and 200° C.
  • NO X ⁇ ⁇ Conversion ⁇ ⁇ Ratio ⁇ ⁇ ( % ) NO X ⁇ ⁇ concentration ⁇ ⁇ after ⁇ ⁇ reduction ⁇ ⁇ catalyst NO X ⁇ ⁇ concentration ⁇ ⁇ before ⁇ ⁇ oxidation ⁇ ⁇ catalyst ⁇ 100
  • the aqueous slurry (A) was prepared in 5 times as many amounts by weight as that in Example 1.
  • a cylindrical honeycomb carrier made of cordierite of 5.7 inches in diameter and 6 inches in length having 400 cells per square inch of cross-sectional area was coated (wash coat) with this slurry so that the sum of platinum, palladium and alumina is 124 g per liter of the honeycomb carrier, dried at 120° C. for 8 hours and then calcined at 500° C. for an hour to obtain catalyst M.
  • the aqueous slurry (D) was prepared in 5 times as many amounts by weight as that in Comparative Example 1.
  • a cylindrical honeycomb carrier made of cordierite of 5.7 inches in diameter and 6 inches in length having 400 cells per square inch of cross-sectional area was coated (wash coat) with this slurry so that the sum of platinum and alumina is 124 g per liter of the honeycomb carrier, dried at 120° C. for 8 hours and then calcined at 500° C. for an hour to obtain catalyst N.
  • An exhaust-gas discharge apparatus was fabricated by installing catalyst M after a direct-injection diesel engine of 2.2 L and a cylindrical diesel particulate filter made of SiC of 5.2 inches in diameter and 9 inches in length having 316 cells per square inch of cross-sectional area in which 9 g of particulate matters discharged from the engine accumulated, after the catalyst.
  • An exhaust-gas discharge apparatus was fabricated by installing catalyst N after a direct-injection diesel engine of 2.2 L and a cylindrical diesel particulate filter made of SiC of 5.2 inches in diameter and 9 inches in length having 316 cells per square inch of cross-sectional area in which 9 g of particulate matters discharged from the engine accumulated, after the catalyst.
  • the removal ratio of particulate matters was evaluated using the exhaust-gas discharge apparatuses of Example 10 and Comparative Example 7.
  • the weight change of the diesel particulate filter from before to after the temperature indicated by the thermocouple before the oxidation catalyst was raised from 115° C. to 400° C. in 100 minutes was measured and thus the weight of the particulate matters remaining on the diesel particulate filter was calculated.
  • the diesel particulate filter was weighed after it was dried at 150° C. for an hour.
  • the removal ratio of particulate matters was determined from the weight of the remaining particulate matters using the following equation. The results are shown in Table 3.
  • Removal ⁇ ⁇ ratio ⁇ ⁇ of ⁇ ⁇ particulate ⁇ ⁇ matters ⁇ ⁇ ( % ) 100 - ⁇ Weight ⁇ ⁇ of ⁇ ⁇ remaining ⁇ ⁇ particulate matters ⁇ ⁇ after ⁇ ⁇ heated ⁇ ⁇ to ⁇ ⁇ ⁇ 400 ⁇ ° ⁇ ⁇ C . 9 ⁇ 100

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
US11/946,620 2006-11-29 2007-11-28 Oxidation Catalyst and Exhaust-Gas Purification System Using the Same Abandoned US20080124264A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/656,799 US8034311B2 (en) 2006-11-29 2010-02-17 Oxidation catalyst and exhaust-gas purification system using the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-322490 2006-11-29
JP2006322490 2006-11-29

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/656,799 Division US8034311B2 (en) 2006-11-29 2010-02-17 Oxidation catalyst and exhaust-gas purification system using the same

Publications (1)

Publication Number Publication Date
US20080124264A1 true US20080124264A1 (en) 2008-05-29

Family

ID=39148612

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/946,620 Abandoned US20080124264A1 (en) 2006-11-29 2007-11-28 Oxidation Catalyst and Exhaust-Gas Purification System Using the Same
US12/656,799 Active US8034311B2 (en) 2006-11-29 2010-02-17 Oxidation catalyst and exhaust-gas purification system using the same

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/656,799 Active US8034311B2 (en) 2006-11-29 2010-02-17 Oxidation catalyst and exhaust-gas purification system using the same

Country Status (6)

Country Link
US (2) US20080124264A1 (ko)
EP (2) EP3925700A1 (ko)
JP (3) JP5619340B2 (ko)
KR (4) KR20080048958A (ko)
CN (1) CN101190410B (ko)
TW (1) TWI449572B (ko)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080274876A1 (en) * 2004-07-27 2008-11-06 Ott Kevin C Catalyst for reduction of nitrogen oxides
US20090074641A1 (en) * 2007-09-19 2009-03-19 General Electric Company Catalyst and method of manufacture
US20090087365A1 (en) * 2007-09-27 2009-04-02 Raoul Klingmann Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly stoichiometric air/fuel mixture
US20090155151A1 (en) * 2007-12-18 2009-06-18 Xinsheng Liu Methods and Systems Including CO Oxidation Catalyst With Low NO to NO2 Conversion
US20090193796A1 (en) * 2008-02-05 2009-08-06 Basf Catalysts Llc Gasoline engine emissions treatment systems having particulate traps
US20090263297A1 (en) * 2007-09-19 2009-10-22 General Electric Company Catalyst and method of manufacture
US20090301067A1 (en) * 2008-06-06 2009-12-10 Delphi Technologies, Inc. Reagent dosing system and method of dosing reagent
WO2010086148A1 (de) 2009-01-28 2010-08-05 Süd-Chemie AG Vanadiumfreier diesel-oxidationskatalysator und vefahren zu dessen herstellung
WO2010086149A1 (de) * 2009-01-28 2010-08-05 Süd-Chemie AG Diesel-oxidationskatalysator mit guter tieftemperaturaktivität
US20100233053A1 (en) * 2008-05-19 2010-09-16 General Electric Company Catalyst and method of manufacture
US20110027155A1 (en) * 2008-03-19 2011-02-03 Ict Co., Ltd. Catalyst for cleaning internal combustion engine exhaust gas and method for cleaning exhaust gas using said catalyst
US20110030346A1 (en) * 2009-08-05 2011-02-10 Basf Se Treatment System for Gasoline Engine Exhaust Gas
US20110047995A1 (en) * 2009-08-31 2011-03-03 General Electric Company Catalyst and method of manufacture
US20110047988A1 (en) * 2009-08-31 2011-03-03 General Electric Company Catalyst and method of manufacture
US20110237430A1 (en) * 2008-11-13 2011-09-29 Beijing University Of Chemical Technology Process for preparing catalyst comprising palladium supported on carrier with high dispersion
US20120094826A1 (en) * 2009-06-17 2012-04-19 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifying catalyst
EP2385227A4 (en) * 2009-01-30 2012-08-15 Mitsubishi Heavy Ind Ltd EMISSION CONTROL DEVICE
US20130236364A1 (en) * 2010-11-19 2013-09-12 Toyota Jidosha Kabushiki Kaisha Exhaust purifying apparatus in internal combustion engine
US8815189B2 (en) 2010-04-19 2014-08-26 Basf Corporation Gasoline engine emissions treatment systems having particulate filters
US20140256541A1 (en) * 2012-10-30 2014-09-11 Jx Nippon Oil & Energy Corporation Dehydrogenation catalyst and method for producing the same
US8889587B2 (en) 2009-08-31 2014-11-18 General Electric Company Catalyst and method of manufacture
US20150078966A1 (en) * 2012-05-14 2015-03-19 N.E. Chemcat Corporation Exhaust gas purifier
US20150352496A1 (en) * 2013-01-24 2015-12-10 Hino Motors, Ltd. Exhaust gas purifier
US9272271B2 (en) 2007-09-19 2016-03-01 General Electric Company Manufacture of catalyst compositions and systems
US9375710B2 (en) 2007-09-19 2016-06-28 General Electric Company Catalyst and method of manufacture
EP2498898B1 (de) 2009-11-12 2016-07-13 Umicore AG & Co. KG Verbesserter dieseloxidationskatalysator
US9463438B2 (en) 2009-01-30 2016-10-11 General Electric Company Templated catalyst composition and associated method
US9463439B2 (en) 2009-01-30 2016-10-11 General Electric Company Templated catalyst composition and associated method
EP2969191A4 (en) * 2013-03-12 2016-11-16 Basf Corp CATALYST MATERIALS FOR NO OXIDATION
US9522385B2 (en) 2013-04-19 2016-12-20 Cataler Corporation Exhaust gas purifying catalyst
US9523302B2 (en) 2011-04-28 2016-12-20 N.E. Chemcat Corporation Off gas purification device
US9545618B2 (en) 2011-06-21 2017-01-17 General Electric Company Method for preparing a catalyst composition suitable for removing sulfur from a catalytic reduction system
EP3088078A4 (en) * 2013-12-24 2017-09-27 Heesung Catalysts Corporation Exhaust gas oxidation catalyst for compressed natural gas combustion system

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4982241B2 (ja) * 2007-04-27 2012-07-25 エヌ・イーケムキャット株式会社 自動車用排気ガス浄化触媒、排気ガス浄化触媒系、および排気ガスの浄化方法
JP2010115600A (ja) * 2008-11-13 2010-05-27 Mitsubishi Fuso Truck & Bus Corp 酸化触媒及びそれを用いた排気処理装置
KR101626541B1 (ko) 2009-11-19 2016-06-01 에스케이이노베이션 주식회사 암모니아의 선택산화 촉매 및 이의 제조방법
ES2590924T3 (es) * 2010-04-01 2016-11-24 Toyota Jidosha Kabushiki Kaisha Método de purificación de gases de escape para motor de combustión interna
EP2520354A1 (en) 2010-06-24 2012-11-07 N.E. Chemcat Corporation Exhaust gas catalytic purging unit using selective reduction catalyst, exhaust gas purging method, and diesel automobile equipped with exhaust gas catalytic purging unit
US9528413B2 (en) * 2010-07-30 2016-12-27 Ford Global Technologies, Llc Synergistic SCR/DOC configurations for lowering diesel emissions
US9120077B2 (en) * 2010-10-01 2015-09-01 Basf Corporation Surface-coated zeolite materials for diesel oxidation applications
US8505285B2 (en) * 2010-10-06 2013-08-13 General Electric Company Catalyst and method of manufacture
CN102451679A (zh) * 2010-10-15 2012-05-16 中国石油化工股份有限公司 一氧化氮氧化剂及其制备方法
US20110165040A1 (en) * 2010-11-03 2011-07-07 Ford Global Technologies, Llc Device for remediating emissions and method of manufacture
JP5152416B2 (ja) * 2011-01-17 2013-02-27 トヨタ自動車株式会社 内燃機関の排気浄化装置
CN102162389B (zh) * 2011-03-30 2013-03-13 北京工业大学 一种基于重整气净化发动机尾气的装置及方法
US9896980B2 (en) 2011-07-26 2018-02-20 Paccar Inc Exhaust aftertreatment supplying a reducing agent
JP5938819B2 (ja) * 2011-10-06 2016-06-22 ジョンソン、マッセイ、パブリック、リミテッド、カンパニーＪｏｈｎｓｏｎ Ｍａｔｔｈｅｙ Ｐｕｂｌｉｃ Ｌｉｍｉｔｅｄ Ｃｏｍｐａｎｙ 排気ガス処理用酸化触媒
GB201200781D0 (en) * 2011-12-12 2012-02-29 Johnson Matthey Plc Exhaust system for a lean-burn ic engine comprising a pgm component and a scr catalyst
KR101353447B1 (ko) * 2012-03-22 2014-01-21 주식회사 알란텀 3차원 반응 구조를 갖는 선택적 촉매 환원용 촉매 담체
JP2015183587A (ja) * 2014-03-24 2015-10-22 日立建機株式会社 熱機関の排ガス浄化装置、排ガス浄化方法及び排ガス浄化触媒
WO2016013794A1 (ko) * 2014-07-22 2016-01-28 두산인프라코어 주식회사 배기가스 정화 장치
CN104117381B (zh) * 2014-08-12 2016-09-14 无锡威孚力达催化净化器有限责任公司 含有Al-Si-Ti复合氧化物的柴油车氧化性催化剂
CN104624049A (zh) * 2014-12-12 2015-05-20 李可文 具有润滑作用的柴油机尾气还原剂、其应用及制备方法
DE102014226669A1 (de) * 2014-12-19 2016-06-23 Robert Bosch Gmbh Abgasnachbehandlungssystem für eine Brennkraftmaschine und Verfahren
JP6501115B2 (ja) * 2015-05-15 2019-04-17 株式会社 Ａｃｒ 二元燃料酸化触媒、二元燃料ｓｃｒ排ガス処理機構、二元燃料ディーゼル内燃機関、および、その制御方法
CN107787246A (zh) * 2015-07-03 2018-03-09 托普索公司 用于催化氧化反应中的温度控制的方法和系统
KR101825469B1 (ko) * 2015-12-23 2018-02-05 희성촉매 주식회사 압축천연가스 연소시스템 배기가스 산화촉매
EP3339590B1 (en) 2016-12-21 2019-08-28 Perkins Engines Company Limited Selective catalytic reduction system
US9914095B1 (en) 2017-02-08 2018-03-13 Ford Global Technologies, Llc Catalyst for automotive emissions control
CN107237663A (zh) * 2017-07-19 2017-10-10 无锡威孚高科技集团股份有限公司 一种用于轻型车双蒸发式dpf再生系统
DK201700681A1 (en) * 2017-12-01 2019-06-20 HANS JENSEN GREENTECH ApS A Selective Catalytic Reduction System and a Method for NOx Reduction
AU2022232918A1 (en) * 2021-03-09 2023-10-12 Sustaera Inc. Direct air capture co2 removal system and process

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US490248A (en) * 1893-01-17 harris
US3397154A (en) * 1963-07-09 1968-08-13 Du Pont Preparation of alumina-supported catalyst compositions and the products thereof
US3488150A (en) * 1966-02-22 1970-01-06 Degussa Production of hydrogen peroxide by the anthraquinone process
US4049576A (en) * 1974-10-04 1977-09-20 Ashland Oil, Inc. Platinum-palladium catalyst for selective hydrogenation of aromatics and olefins in hydrocarbon fractions
US4157316A (en) * 1975-08-27 1979-06-05 Engelhard Minerals & Chemicals Corporation Polyfunctional catalysts
US4171287A (en) * 1977-09-23 1979-10-16 Engelhard Minerals & Chemicals Corporation Catalyst compositions and the method of manufacturing them
US4536482A (en) * 1983-03-14 1985-08-20 E. I. Du Pont De Nemours And Company Catalyst composition
US4808394A (en) * 1987-09-08 1989-02-28 Phillips Petroleum Company Catalytic oxidation of carbon monoxide
US5275997A (en) * 1990-01-02 1994-01-04 Pcp Consulting And Research, Inc. Precious metal catalysts utilizing composites of oxygen-ion conducting and inert support materials
US5856263A (en) * 1992-08-28 1999-01-05 Union Carbide Chemicals & Plastics Technology Corporation Catalysts comprising substantially pure alpha-alumina carrier for treating exhaust gases
US6030921A (en) * 1996-07-15 2000-02-29 Chevron U.S.A. Inc. Sulfur resistant hydroconversion catalyst and hydroprocess of sulfur-containing lube feedstock
US20020039550A1 (en) * 2000-04-22 2002-04-04 Adolf Schafer-Sindlinger Process and catalyst for reducing nitrogen oxides
US20030139290A1 (en) * 2002-01-22 2003-07-24 Jordan Jeffrey D. Methodology for the effective stabilization of tin-oxide-based oxidation/reduction catalysts
US20040168429A1 (en) * 2002-11-21 2004-09-02 Kenji Dosaka Process for decreasing content of particulate material contained in exhaust gas from lean burn engine or the like
US7576031B2 (en) * 2006-06-09 2009-08-18 Basf Catalysts Llc Pt-Pd diesel oxidation catalyst with CO/HC light-off and HC storage function

Family Cites Families (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4912776A (en) * 1987-03-23 1990-03-27 W. R. Grace & Co.-Conn. Process for removal of NOx from fluid streams
US4902487A (en) 1988-05-13 1990-02-20 Johnson Matthey, Inc. Treatment of diesel exhaust gases
JP3276191B2 (ja) * 1993-01-29 2002-04-22 三菱重工業株式会社 窒素酸化物の浄化方法
JP3791968B2 (ja) * 1996-06-06 2006-06-28 財団法人石油産業活性化センター 窒素酸化物の接触還元方法
JPH1076141A (ja) * 1996-09-02 1998-03-24 Toyota Motor Corp 排気ガス浄化用触媒
GB9801023D0 (en) * 1998-01-19 1998-03-18 Johnson Matthey Plc Combatting air pollution
GB9802504D0 (en) 1998-02-06 1998-04-01 Johnson Matthey Plc Improvements in emission control
JP4012320B2 (ja) * 1998-10-15 2007-11-21 株式会社アイシーティー 希薄燃焼エンジン用排気ガス浄化用触媒
GB9913331D0 (en) * 1999-06-09 1999-08-11 Johnson Matthey Plc Treatment of exhaust gas
US6685897B1 (en) * 2000-01-06 2004-02-03 The Regents Of The University Of California Highly-basic large-pore zeolite catalysts for NOx reduction at low temperatures
US6492297B1 (en) * 2000-09-15 2002-12-10 Engelhard Corporation Catalyst composition for purifying exhaust gas
US6699448B2 (en) * 2001-01-26 2004-03-02 Engelhard Corporation SOx tolerant NOx trap catalysts and methods of making and using the same
GB0104682D0 (en) * 2001-02-26 2001-04-11 Johnson Matthey Plc Gas treatment using ammonia
US6764665B2 (en) * 2001-10-26 2004-07-20 Engelhard Corporation Layered catalyst composite
WO2003068394A1 (fr) * 2002-02-15 2003-08-21 Ict Co., Ltd. Catalyseur permettant de clarifier les emissions provenant d'un moteur a combustion interne, son procede de preparation, et procede de clarification des emissions provenant d'un moteur a combustion interne
US7384612B2 (en) * 2002-02-19 2008-06-10 Kabushiki Kaisha Chemical Auto Diesel exhaust gas purifying filter
CN1161183C (zh) * 2002-06-28 2004-08-11 福州大学 汽车尾气三元催化剂及其制备方法
ES2280779T3 (es) * 2002-09-13 2007-09-16 Johnson Matthey Public Limited Company Motor de encendido por compresion, y sistema de escape para este.
JP4254208B2 (ja) * 2002-11-20 2009-04-15 株式会社日立製作所 内燃機関の排ガス浄化装置，浄化方法及び触媒
JP2004169643A (ja) 2002-11-21 2004-06-17 Honda Motor Co Ltd リーンバーンエンジン等の排気ガスに含まれる粒子状物質の低減方法
JP2004188388A (ja) * 2002-12-13 2004-07-08 Babcock Hitachi Kk ディーゼル排ガス浄化用フィルタおよびその製造方法
JP4236543B2 (ja) * 2003-09-08 2009-03-11 本田技研工業株式会社 窒素酸化物の接触分解のための触媒と方法
JP2005248787A (ja) * 2004-03-03 2005-09-15 Mitsubishi Fuso Truck & Bus Corp 排気浄化装置
JP4351091B2 (ja) * 2004-03-09 2009-10-28 寛 松岡 排気ガス浄化システム
WO2006031297A2 (en) * 2004-07-27 2006-03-23 The Regents Of The University Of California Catalyst and method for reduction of nitrogen oxides
DE102004040549B4 (de) * 2004-08-21 2017-03-23 Umicore Ag & Co. Kg Katalytisch beschichtetes Partikelfilter und seine Verwendung
JP2006125206A (ja) * 2004-10-26 2006-05-18 Ict:Kk 内燃機関排気ガスの浄化方法およびその装置
US7462338B2 (en) * 2004-12-28 2008-12-09 Umicore Ag & Co. Kg Boron-alumina catalyst support
US7393511B2 (en) * 2005-02-16 2008-07-01 Basf Catalysts Llc Ammonia oxidation catalyst for the coal fired utilities
JP4681922B2 (ja) * 2005-04-01 2011-05-11 エヌ・イーケムキャット株式会社 排気ガス浄化用酸化触媒、及びそれを用いた排気ガス浄化システム
JP2006322490A (ja) 2005-05-18 2006-11-30 Honda Motor Co Ltd 電動パーキングロック装置
TWM299776U (en) * 2006-02-09 2006-10-21 Jr-Shing Liu Two-stage engine exhaust reduction device
JP2007285295A (ja) * 2006-03-24 2007-11-01 Ngk Insulators Ltd 排気ガス浄化システム
EP2097170A4 (en) * 2006-11-20 2010-04-07 Nanostellar Inc PROCESS FOR PRODUCING HETEROGENEOUS CATALYSTS CONTAINING METAL NANOPARTICLES
JP4982241B2 (ja) * 2007-04-27 2012-07-25 エヌ・イーケムキャット株式会社 自動車用排気ガス浄化触媒、排気ガス浄化触媒系、および排気ガスの浄化方法

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US490248A (en) * 1893-01-17 harris
US3397154A (en) * 1963-07-09 1968-08-13 Du Pont Preparation of alumina-supported catalyst compositions and the products thereof
US3488150A (en) * 1966-02-22 1970-01-06 Degussa Production of hydrogen peroxide by the anthraquinone process
US4049576A (en) * 1974-10-04 1977-09-20 Ashland Oil, Inc. Platinum-palladium catalyst for selective hydrogenation of aromatics and olefins in hydrocarbon fractions
US4157316A (en) * 1975-08-27 1979-06-05 Engelhard Minerals & Chemicals Corporation Polyfunctional catalysts
US4171287A (en) * 1977-09-23 1979-10-16 Engelhard Minerals & Chemicals Corporation Catalyst compositions and the method of manufacturing them
US4536482A (en) * 1983-03-14 1985-08-20 E. I. Du Pont De Nemours And Company Catalyst composition
US4808394A (en) * 1987-09-08 1989-02-28 Phillips Petroleum Company Catalytic oxidation of carbon monoxide
US5275997A (en) * 1990-01-02 1994-01-04 Pcp Consulting And Research, Inc. Precious metal catalysts utilizing composites of oxygen-ion conducting and inert support materials
US5856263A (en) * 1992-08-28 1999-01-05 Union Carbide Chemicals & Plastics Technology Corporation Catalysts comprising substantially pure alpha-alumina carrier for treating exhaust gases
US6030921A (en) * 1996-07-15 2000-02-29 Chevron U.S.A. Inc. Sulfur resistant hydroconversion catalyst and hydroprocess of sulfur-containing lube feedstock
US20020039550A1 (en) * 2000-04-22 2002-04-04 Adolf Schafer-Sindlinger Process and catalyst for reducing nitrogen oxides
US20030139290A1 (en) * 2002-01-22 2003-07-24 Jordan Jeffrey D. Methodology for the effective stabilization of tin-oxide-based oxidation/reduction catalysts
US7390768B2 (en) * 2002-01-22 2008-06-24 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Stabilized tin-oxide-based oxidation/reduction catalysts
US20040168429A1 (en) * 2002-11-21 2004-09-02 Kenji Dosaka Process for decreasing content of particulate material contained in exhaust gas from lean burn engine or the like
US7576031B2 (en) * 2006-06-09 2009-08-18 Basf Catalysts Llc Pt-Pd diesel oxidation catalyst with CO/HC light-off and HC storage function

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7691769B2 (en) * 2004-07-27 2010-04-06 Los Alamos National Security, Llc Catalyst for reduction of nitrogen oxides
US20080274876A1 (en) * 2004-07-27 2008-11-06 Ott Kevin C Catalyst for reduction of nitrogen oxides
US9375710B2 (en) 2007-09-19 2016-06-28 General Electric Company Catalyst and method of manufacture
US9272271B2 (en) 2007-09-19 2016-03-01 General Electric Company Manufacture of catalyst compositions and systems
US20090263297A1 (en) * 2007-09-19 2009-10-22 General Electric Company Catalyst and method of manufacture
US20090074641A1 (en) * 2007-09-19 2009-03-19 General Electric Company Catalyst and method of manufacture
US8530369B2 (en) 2007-09-19 2013-09-10 General Electric Company Catalyst and method of manufacture
US20090087365A1 (en) * 2007-09-27 2009-04-02 Raoul Klingmann Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly stoichiometric air/fuel mixture
US8066963B2 (en) * 2007-09-27 2011-11-29 Umicore Ag & Co. Kg Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly stoichiometric air/fuel mixture
US7976784B2 (en) * 2007-12-18 2011-07-12 Basf Corporation Methods and systems including CO oxidation catalyst with low NO to NO2 conversion
US20090155151A1 (en) * 2007-12-18 2009-06-18 Xinsheng Liu Methods and Systems Including CO Oxidation Catalyst With Low NO to NO2 Conversion
US8173087B2 (en) 2008-02-05 2012-05-08 Basf Corporation Gasoline engine emissions treatment systems having particulate traps
US20090193796A1 (en) * 2008-02-05 2009-08-06 Basf Catalysts Llc Gasoline engine emissions treatment systems having particulate traps
US20110027155A1 (en) * 2008-03-19 2011-02-03 Ict Co., Ltd. Catalyst for cleaning internal combustion engine exhaust gas and method for cleaning exhaust gas using said catalyst
US8771624B2 (en) * 2008-03-19 2014-07-08 Umicore Shokubai Japan Co., Ltd Catalyst for purifying exhaust gas from internal combustion engine and process for purifying exhaust gas using the same
US20100233053A1 (en) * 2008-05-19 2010-09-16 General Electric Company Catalyst and method of manufacture
US8871669B2 (en) 2008-05-19 2014-10-28 General Electric Company Catalyst and method of manufacture
GB2460825A (en) * 2008-06-06 2009-12-16 Delphi Tech Inc Reagent dosing system
US8899021B2 (en) 2008-06-06 2014-12-02 Delphi International Operations Luxembourg S.A.R.L. Reagent dosing system and method of dosing reagent
US9279351B2 (en) 2008-06-06 2016-03-08 Delphi International Operations Luxembourg S.A.R.L. Reagent dosing system and method of dosing reagent
US10107164B2 (en) 2008-06-06 2018-10-23 Delphi Technologies Ip Limited Reagent dosing system and method of dosing reagent
US20090301067A1 (en) * 2008-06-06 2009-12-10 Delphi Technologies, Inc. Reagent dosing system and method of dosing reagent
US8765632B2 (en) * 2008-11-13 2014-07-01 Beijing University Of Chemical Technology Process for preparing catalyst comprising palladium supported on carrier with high dispersion
US20110237430A1 (en) * 2008-11-13 2011-09-29 Beijing University Of Chemical Technology Process for preparing catalyst comprising palladium supported on carrier with high dispersion
WO2010086149A1 (de) * 2009-01-28 2010-08-05 Süd-Chemie AG Diesel-oxidationskatalysator mit guter tieftemperaturaktivität
WO2010086148A1 (de) 2009-01-28 2010-08-05 Süd-Chemie AG Vanadiumfreier diesel-oxidationskatalysator und vefahren zu dessen herstellung
US9539562B2 (en) 2009-01-28 2017-01-10 Clariant Produkte (Deutschland) Gmbh Vanadium-free diesel oxidation catalyst and method for its production
US8859454B2 (en) 2009-01-28 2014-10-14 Clariant Produkte (Deutschland) Gmbh Diesel oxidation catalyst with good low-temperature activity
EP2385227A4 (en) * 2009-01-30 2012-08-15 Mitsubishi Heavy Ind Ltd EMISSION CONTROL DEVICE
US9463439B2 (en) 2009-01-30 2016-10-11 General Electric Company Templated catalyst composition and associated method
US9463438B2 (en) 2009-01-30 2016-10-11 General Electric Company Templated catalyst composition and associated method
US20120094826A1 (en) * 2009-06-17 2012-04-19 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifying catalyst
US9421535B2 (en) * 2009-06-17 2016-08-23 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifying catalyst
US20110030346A1 (en) * 2009-08-05 2011-02-10 Basf Se Treatment System for Gasoline Engine Exhaust Gas
US8758695B2 (en) 2009-08-05 2014-06-24 Basf Se Treatment system for gasoline engine exhaust gas
US8353155B2 (en) * 2009-08-31 2013-01-15 General Electric Company Catalyst and method of manufacture
US20110047995A1 (en) * 2009-08-31 2011-03-03 General Electric Company Catalyst and method of manufacture
US8889587B2 (en) 2009-08-31 2014-11-18 General Electric Company Catalyst and method of manufacture
US20110047988A1 (en) * 2009-08-31 2011-03-03 General Electric Company Catalyst and method of manufacture
EP2498898B1 (de) 2009-11-12 2016-07-13 Umicore AG & Co. KG Verbesserter dieseloxidationskatalysator
US8815189B2 (en) 2010-04-19 2014-08-26 Basf Corporation Gasoline engine emissions treatment systems having particulate filters
US20130236364A1 (en) * 2010-11-19 2013-09-12 Toyota Jidosha Kabushiki Kaisha Exhaust purifying apparatus in internal combustion engine
US9523302B2 (en) 2011-04-28 2016-12-20 N.E. Chemcat Corporation Off gas purification device
US9545618B2 (en) 2011-06-21 2017-01-17 General Electric Company Method for preparing a catalyst composition suitable for removing sulfur from a catalytic reduction system
US9480948B2 (en) * 2012-05-14 2016-11-01 N.E. Chemcat Corporation Exhaust gas purifier
US20150078966A1 (en) * 2012-05-14 2015-03-19 N.E. Chemcat Corporation Exhaust gas purifier
US9539544B1 (en) 2012-05-14 2017-01-10 N.E. Chemcat Corporation Exhaust gas purifier
US8999880B2 (en) * 2012-10-30 2015-04-07 Jx Nippon Oil & Energy Corporation Dehydrogenation catalyst and method for producing the same
US8993476B2 (en) 2012-10-30 2015-03-31 Jx Nippon Oil & Energy Corporation Dehydrogenation catalyst and method for producing the same
US20140256541A1 (en) * 2012-10-30 2014-09-11 Jx Nippon Oil & Energy Corporation Dehydrogenation catalyst and method for producing the same
US9765675B2 (en) * 2013-01-24 2017-09-19 Hino Motors, Ltd. Exhaust gas purifier
US20150352496A1 (en) * 2013-01-24 2015-12-10 Hino Motors, Ltd. Exhaust gas purifier
EP2969191A4 (en) * 2013-03-12 2016-11-16 Basf Corp CATALYST MATERIALS FOR NO OXIDATION
US9522385B2 (en) 2013-04-19 2016-12-20 Cataler Corporation Exhaust gas purifying catalyst
EP3088078A4 (en) * 2013-12-24 2017-09-27 Heesung Catalysts Corporation Exhaust gas oxidation catalyst for compressed natural gas combustion system

Also Published As

Publication number Publication date
JP2008155204A (ja) 2008-07-10
CN101190410A (zh) 2008-06-04
EP1941942A3 (en) 2010-08-11
KR20160013242A (ko) 2016-02-03
JP2017100132A (ja) 2017-06-08
KR20080048958A (ko) 2008-06-03
EP3925700A1 (en) 2021-12-22
KR20140109344A (ko) 2014-09-15
TWI449572B (zh) 2014-08-21
TW200822967A (en) 2008-06-01
CN101190410B (zh) 2013-03-06
EP1941942B1 (en) 2021-06-16
US20100150800A1 (en) 2010-06-17
US8034311B2 (en) 2011-10-11
JP6151002B2 (ja) 2017-06-21
JP5619340B2 (ja) 2014-11-05
EP1941942A2 (en) 2008-07-09
KR101849342B1 (ko) 2018-04-16
JP2013056336A (ja) 2013-03-28
KR20170049493A (ko) 2017-05-10

Similar Documents

Publication Publication Date Title
US8034311B2 (en) Oxidation catalyst and exhaust-gas purification system using the same
JP5769708B2 (ja) 選択還元型触媒を用いた排気ガス浄化装置及び排気ガス浄化方法
JP5110954B2 (ja) 選択還元型触媒を用いた排気ガス浄化触媒装置並びに排気ガス浄化方法
EP2102461B1 (en) Emission treatment systems and methods
KR100871898B1 (ko) 디젤 엔진의 배기가스 정화 장치
US20080127638A1 (en) Emission Treatment Systems and Methods
US10376839B2 (en) Exhaust gas purification catalyst for lean burn engine
KR20120113234A (ko) 차량용 포지티브 점화 내연 기관 엔진을 위한 배기 시스템
JP4644634B2 (ja) 脱硝触媒組成物、一体構造型脱硝触媒、及びそれを用いた脱硝方法
JP2016043320A (ja) 尿素加水分解触媒及び尿素加水分解材料を用いた選択還元触媒
JP5030343B2 (ja) 排ガス浄化装置及び排ガス処理方法
JP2003290629A (ja) 排ガス浄化システム
WO2014125934A1 (ja) 内燃機関の排ガス浄化装置、排ガス浄化方法及び排ガス浄化触媒
KR20080101451A (ko) 프라즈마개질기를 이용한 배기가스정화장치
KR100680324B1 (ko) 자동차 배기가스의 질소 산화물 저감용 촉매 조성물
JPH06343866A (ja) 排気ガス浄化用触媒

Legal Events

Date Code Title Description
AS Assignment

Owner name: INTERNATIONAL CATALYST TECHNOLOGY, INC., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IKEDA, MASANORI;KATO, NAOHIRO;REEL/FRAME:020171/0331

Effective date: 20071121

Owner name: ICT CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IKEDA, MASANORI;KATO, NAOHIRO;REEL/FRAME:020171/0331

Effective date: 20071121

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION