WO2006068022A1 - ディーゼル排ガス処理用の燃焼触媒及びディーゼル排ガスの処理方法 - Google Patents
ディーゼル排ガス処理用の燃焼触媒及びディーゼル排ガスの処理方法 Download PDFInfo
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- WO2006068022A1 WO2006068022A1 PCT/JP2005/023025 JP2005023025W WO2006068022A1 WO 2006068022 A1 WO2006068022 A1 WO 2006068022A1 JP 2005023025 W JP2005023025 W JP 2005023025W WO 2006068022 A1 WO2006068022 A1 WO 2006068022A1
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- catalyst
- exhaust gas
- iridium
- diesel exhaust
- combustion
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- 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
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/66—Silver or gold
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/065—Surface coverings for exhaust purification, e.g. catalytic reaction for reducing soot ignition temperature
Definitions
- the present invention relates to a catalyst for treating diesel exhaust gas and a method for treating diesel exhaust gas. Specifically, the present invention relates to a catalyst capable of burning and removing particulate suspended matters contained in diesel exhaust gas, particularly carbon fine particles (soot) at a lower temperature than before.
- exhaust gas discharged from diesel engines contains solid or liquid particulate suspended matter.
- This particulate suspended matter is mainly composed of solid carbon particles, solid or liquid incombustible fuel hydrocarbon-based particles, and sulfides mainly composed of sulfur dioxide generated by combustion of sulfur in the fuel. It is configured.
- a catalyst for burning particulate suspended matters a catalyst in which a noble metal such as platinum, palladium, rhodium or the like, or an oxide of such noble metal is supported as a catalyst component has been used.
- the activation temperature (hereinafter sometimes referred to as combustion temperature) is as high as 500 ° C or higher.
- combustion temperature is as high as 500 ° C or higher.
- the sulfur disulfide contained in diesel exhaust gas is converted to sulfur trioxide and sulfuric acid mist, and particulate suspended matter is not removed.
- exhaust gas purification was incomplete. Therefore, development of a catalyst suitable for the use is required for diesel exhaust gas treatment.
- the applicant of the present application has proposed a catalyst described in Patent Document 1 as a catalyst that is active even at a low temperature of 500 ° C. or lower and can burn particulate suspended matter.
- oxide particles which are catalyst carriers for supporting a catalyst component, are loaded with an oxide of alkali metal such as potassium instead of a noble metal as a catalyst component.
- a catalyst capable of burning particulate suspended matter at a low combustion temperature can be obtained.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-170483
- the above-mentioned conventional diesel exhaust gas treatment catalyst has a certain result as compared with the activation purpose and the original purpose.
- the activation temperature is lower. This is because the exhaust temperature from a diesel engine is 350 ° C or higher when the engine is operating under high load conditions, but the normal operating condition (for example, when a vehicle with a diesel engine is running in an urban area) Etc.) rarely exceed 300 ° C. Therefore, even if the catalyst is mounted, it may be insufficient for purifying exhaust gas in a normal operation state.
- an object of the present invention is to provide a catalyst for treating diesel exhaust gas having a lower temperature than that of the prior art, specifically, an activation temperature of less than 350 ° C.
- ceria-zircoua which is a complex oxide of ceria (cerium oxide: CeO) and zircoure (zirconium oxide: ZrO)
- Or ceria which is a complex oxide of ceria and praseodymium oxide (Pr 2 O 3 or Pr 2 O 3).
- oxide-based ceramic particles containing either praseodymium oxide or misalignment are preferred as the carrier, and have arrived at the present invention.
- the present invention relates to a catalyst for combustion treatment of particulate suspended matters in diesel exhaust gas.
- a combustion catalyst for treating diesel exhaust gas in which a noble metal or a noble metal oxide is supported as a catalyst component on a support made of oxide ceramic particles containing ceria zirconia or praseodymium ceria. .
- the ceria in the carrier also has a direct combustion action on the particulate suspended matter, but as a more useful function, the ceria in the catalyst is in the form of particles on the catalyst by the oxygen storage-release action. It has an auxiliary function of supplying oxygen for burning suspended matters.
- the use of the complex oxide form of ceria-zircoua or ceria-praseodymium oxide is more effective in heat resistance and sulfur poisoning resistance in the form of these complex oxides than in the case of ceria alone. Because there is.
- the precious metal or precious metal oxide which is a catalyst component bears the action which the catalyst called combustion of particulate suspended solids should originally exhibit.
- the oxide-based ceramic containing ceria-zirconia or ceria-praseodymium oxide as a support releases oxygen in the diesel exhaust gas atmosphere while releasing the noble metal or noble metal oxide.
- Auxiliary functions are provided to promote the combustion of particulate suspended matter.
- the content of ceria in the oxide ceramic particles constituting the support is preferably as high as possible. Specifically, it is preferable to contain 45% by weight or more of ceria with respect to the weight of the support. As described above, ceria has an action of supplying oxygen to burn particulate suspended matter at a low temperature, and even if it is less than 50% by weight, it has an effect of reducing the activation temperature. In this case, particulate suspended matter This is because it is difficult to completely burn. A more preferable range of the ceria content is 45 to 95% by weight.
- this carrier is preferably one in which the balance other than ceria is zircoure or praseodymium oxide, but may contain other oxides. For example, alumina, silica, titania and the like may be included. In particular, a carrier further containing yttria and lanthanum oxide, which will be described later, exhibits preferable characteristics.
- the present inventors have further added yttria (yttrium oxide: YO) or oxidized oxide to the ceria-zirconia or ceria-praseodymium oxide.
- yttria yttrium oxide: YO
- oxidized oxide to the ceria-zirconia or ceria-praseodymium oxide.
- grains containing a tantalum was discovered. This carrier is also
- the catalyst has an auxiliary function by oxygen storage-release action, and has improved heat resistance and sulfur poisoning resistance.
- the heat resistance of the catalyst is further improved by containing yttria or lanthanum oxide. It is.
- the content of ceria is as large as possible. Specifically, it is preferable that ceria is 45 to 95% by weight, and yttria or lanthanum oxide is 0 ⁇ :! to 15% by weight. Most preferably, the remainder other than ceria, yttria, and lanthanum oxide is composed of ceria-zircoua-yttria composite oxide or ceria-zircoua-lanthanum oxide composite oxide. However, other oxides may be included. For example, alumina, silica, titania and the like may be included.
- the catalyst component supported on the support is preferably ruthenium, iridium, platinum or silver, which is preferably a noble metal.
- Particularly preferred noble metal components are those containing ruthenium or iridium as a main component.
- the activity is best when the carrier is ceria-zircoua or ceria-praseodymium oxide.
- a carrier further containing yttria and lanthanum oxide (ceria, dinoleconia, yttria, and ceria praseodymium lanthanum oxide).
- ceria zirconia yttria or preriaodymium lanthanum oxide as a carrier.
- the catalyst component may be in the metal state of these noble metals, or may be one in which all or part of it is an oxide.
- the amount of the noble metal (norretium, iridium, platinum, silver) supported is preferably in an appropriate range. This is because the purpose of low-temperature combustion is fully exhibited.
- the supported amount of the catalyst component is preferably 0.1 to 10% by weight with respect to the weight of the carrier.
- the lower limit of 0.1% by weight is the minimum supported amount for ensuring activity.
- the upper limit of 10% by weight is a force that does not improve the activity (decrease in the activation temperature) even if it is supported any more.
- a particularly preferable loading is 0.:! To 5% by weight.
- a catalyst carrying ruthenium or iridium (hereinafter, sometimes simply referred to as a ruthenium catalyst or an iridium catalyst) is more than carrying these precious metals alone.
- the one that additionally supports other precious metals is preferred.
- the additional catalyst component is preferably a ruthenium catalyst, and thus iridium and / or silver.
- the supported amount of iridium is preferably 1: 20-20: 1 with the ratio of the supported amount of ruthenium and the supported amount of iridium (ruthenium: iridium) being 1: 20-20: 1 (more preferably 1: 20-3: 1).
- the ratio of the amounts of both metals supported is preferably 1: 1-10: 1, more preferably 1: 3-3: 1). If the amount of iridium and silver supported is less than the above ratio, the effect is not exhibited. On the other hand, if these loadings are too large, the catalytic properties of ruthenium, the main catalyst component, will be diluted.
- iridium demonstrates an effect by addition of a small amount compared with silver.
- a preferred additional catalyst component in the iridium catalyst is at least one of platinum, rhodium, ruthenium, palladium, and silver. Particularly preferred among these additional noble metals are platinum, rhodium and ruthenium.
- the supported amount of platinum is preferably such that the ratio of the supported amount of iridium to the supported amount of platinum (iridium: platinum) is 1: 30-30: 1 (more preferably 1: 3-3 : 1).
- the rhodium loading is preferably such that the ratio of the iridium loading to the rhodium loading (iridium: rhodium) is 1: 30-30: 1 (more preferably 1: 3 to 3: 1).
- the supported amount of ruthenium is preferably such that the ratio of the supported amount of iridium to the supported amount of ruthenium (iridium: ruthenium) is 1:20 to 20: 1 (more preferably, 1: 3 to : 10: 1). As described above, this is because the effect of supporting an additional noble metal is exhibited and the characteristics of iridium as a main component are not deteriorated. Note that a plurality of these additional metals may be supported. For example, two kinds of noble metals, ruthenium and silver, may be additionally supported with respect to iridium.
- the combustion catalyst according to the present invention can be produced by a simple method. Basically, metal species such as noble metal metal powder, noble metal oxide powder, colloidal particles, alkoxide and metal salt (nitrate, carbonate, sulfate, acetate, etc.) hydroxide, which are catalyst components, are used.
- the catalyst containing the catalyst component can be obtained by impregnating the aqueous solution containing the oxide-based ceramic powder serving as a carrier, attaching a metal species to the surface of the ceramic powder, and then drying and further heat-treating. This is the same as the usual method for producing a catalyst.
- a noble metal as a main component is supported on the support.
- a mixed aqueous solution containing additional metal species may be used as the aqueous solution.
- a catalyst on which a noble metal as a main component is supported may be manufactured first, and impregnated with an aqueous solution containing an additional catalyst component metal species, or vice versa.
- the aqueous solution for supporting additional metals separately is the same as described above.
- the catalyst according to the present invention is supported on an appropriate base material (a ceramic honeycomb such as alumina, zirconia, titania, silica, and zeolite, or a metallic base material such as a metal honeycomb) in actual use. Is preferred.
- a powdered catalyst can be made into a slurry, and the base material can be immersed in this to form a catalyst layer on the surface of the base material.
- the catalyst according to the present invention can also be used in a powder state. In this case, the catalyst can be used by filling a container in a powder state and allowing exhaust gas to pass through the container.
- a catalyst layer on the substrate by a so-called wash coating method.
- a substrate is immersed in an oxide ceramic slurry containing ceria (zirconia, praseodymium oxide, yttria, lanthanum oxide) serving as a carrier to form a ceramic layer (wash coat) on the surface.
- the catalyst layer can be formed by dipping in an aqueous solution containing a metal species and attaching the metal species to the ceramic layer, followed by heat treatment.
- the thickness of the washcoat is preferably 5 to 50 ⁇ m.
- a catalyst layer made only of an oxide ceramic containing ceria may be formed on the base material by a wash coat method.
- an oxide such as alumina, zirconia, titania, silica, zeolite and the like conventionally used in the wash coat method is formed as an underlayer, and an oxide ceramic layer according to the present invention is formed thereon to form a double layer.
- An oxide layer may be formed, and a catalytic metal may be supported on the oxide layer.
- the form of the substrate is not limited to the above honeycomb shape, and may be a granular or sheet shape. In addition, it can be used as a base material for filters such as fibers and wire mesh, and various PM filters for diesel exhaust.
- filters such as fibers and wire mesh, and various PM filters for diesel exhaust.
- the combustion catalyst for treating diesel exhaust gas according to the present invention has sufficient activity for the combustion of particulate suspended matter in the gas, and generates combustion at a low temperature around 300 ° C. Can be used.
- the catalyst according to the present invention operates stably for a long period of time, and can burn particulate suspended matters, particularly carbon fine particles.
- the step of collecting particulate suspended matter in diesel exhaust gas and combusting and removing the collected particulate suspended matter with the catalyst according to the present invention includes.
- other exhaust gas treatment may be performed before and after the treatment step with the catalyst according to the present invention.
- a process of reducing NO in exhaust gas to N2 may be performed before the treatment process with the catalyst of the present invention.
- Example 1 4.5. 67 g of a 5% solution of noretenum nitrate solution was impregnated in 1 g of ceria monozinoleconia powder, dried, and then calcined at 500 ° C for 0.5 hours. A catalyst (ruthenium catalyst) in which ruthenium was supported on a ceria-zircoua support was obtained. The amount of ruthenium supported by this catalyst is 3% by weight.
- Ratio 1 As a comparative example for confirming low temperature combustion of the catalyst according to Example 1, a combustion catalyst in which platinum particles were supported as catalyst particles on alumina particles as a carrier was manufactured. After dropping 0.59 g of a dinitrodiammine platinum solution with a platinum concentration of 8.476 wt% into 1. Og alumina powder, the catalyst was manufactured by heat treatment in the same manner as in the first embodiment (platinum supported amount). 5% by weight).
- Combustion Performance by heating a mixed powder (carbon fine powder content: 5 wt%) obtained by mixing the combustion catalyst according to Example 1 and Comparative Example 1 and fine carbon powder to burn the fine carbon powder. It was investigated. The combustion performance was examined by the TG-DTA method (thermal mass differential thermal analysis). In the test, the final heating temperature is set to 600 ° C, and the specified temperature after reaching 600 ° C from the start of heating. The mass change of the mixed powder up to the time was followed and the amount of heat generated was measured. The combustion temperature was determined by determining the temperature at which clear mass loss and heat generation began to occur in the obtained TG-DTA curve. Table 1 shows the combustion start temperature of each catalyst.
- Example 2 and Example 3 Here, with respect to Example 1, catalysts in which iridium and silver were additionally supported in addition to ruthenium as a catalyst metal were produced, and the combustion temperatures thereof were examined. Ruthenium catalyst prepared in Example 1 (Noreteniumu 3 wt 0/0) 2g, the Shioi ⁇ iridium solution 2g of iridium concentration 1.0 wt 0/0 by impregnating the ruthenium iridium catalyst (Example 2). The ruthenium-iridium catalyst lg of Example 2 was impregnated with a silver nitrate solution lg having a silver concentration of 3.0 wt% to obtain a ruthenium iridium silver catalyst (Example 3).
- Example 2 For these catalysts, as in Example 1, mixed powder (carbon fine powder content: 5 wt%) mixed with the catalyst and carbon fine powder was heated to burn the carbon fine powder. TG- DTA The combustion performance was examined at. Here, in the same manner as in Example 1, in addition to the initial activity (combustion start temperature immediately after production), the combustion start temperature of the catalyst heated at 650 ° C. for a predetermined time was investigated, and its heat resistance was also examined. Table 2 shows the results.
- Example 4 a catalyst was produced by supporting ceria zirconia as a support, oxide ceramics containing yttria, and iridium as a catalyst metal. 2g of iridium content 1.0g of salt and iridium solution was impregnated into lg ceria-dinoleconia-yttria powder (average particle size about 5 / m), dried and then at 500 ° C for 2 hours Baked. Thereafter, chlorine and impurities were washed, filtered and dried overnight at 120 ° C. to obtain a catalyst. The amount of iridium supported by this catalyst is 2% by weight.
- Example 5 A catalyst was produced using ceria-zircoua-yttria as a carrier and platinum as a catalyst metal. 0.094 g of a dinitrodiammine platinum solution having a platinum concentration of 8.476% by weight was impregnated with 1 g of ceria-dinoleconia-yttria powder (average particle size of about 5 xm), dried, and then heated at 500 ° C. Baked for hours. Thereafter, chlorine and impurities were washed, filtered, and dried overnight at 120 ° C to obtain a catalyst. The amount of platinum supported by this catalyst is 0.8% by weight.
- Example 4 For the catalysts produced in Example 4 and Example 5, as in Example 1, mixed powder (carbon fine powder content: 5 wt%) in which the catalyst and carbon fine powder were mixed was heated to produce carbon fine powder. Combustion performance was examined using TG-DTA after burning the powder. Table 3 shows the results.
- Example 6 Next, according to the production process in Example 4, the amount of iridium supported was adjusted by adjusting the amount of salt-iridium solution used, and the amount of iridium supported was 0.5% by weight, 1%, 2%, 3%, 5%, 10%, and 20% iridium catalysts were produced. A combustion test was conducted on these catalysts in the same way to examine their performance. Table 4 shows the results.
- Example 7 Here, a catalyst was produced using ceria zirconia yttria as a support, iridium as a catalyst metal, and silver as an additional noble metal. Impregnated lg ceria-dinoleconia-yttria powder (average particle size about 5 / m) with lg of iridium content 1.0% iridium iridium solution, dried, and then dried at 500 ° C for 2 hours Baked. Thereafter, chlorine and impurities were washed, filtered, and dried overnight at 120 ° C. to obtain an iridium catalyst. This iridium catalyst lg is impregnated with silver nitrate solution lg having a silver concentration of 3.0% by weight. A silver catalyst was used (iridium loading: 1% by weight, silver loading: 3% by weight).
- Example 8 In the same manner as in Example 7, a catalyst was produced by supporting Ceria-Dinoreconia-yttria as a carrier, iridium as a catalyst metal, and rhodium as an additional noble metal.
- Iridium catalyst produced in the same process as in Example 7 iridium supported amount: 1% by weight
- 1 g was impregnated with 0.67 g of a rhodium nitrate solution having a mouthwater concentration of 3.0% by weight to obtain an iridium-rhodium catalyst.
- Iridium loading 1 wt%
- rhodium loading 0.2 wt%).
- Example 9 A catalyst was produced by supporting ceria-zirconia-yttria as a carrier, iridium as a catalyst metal, and platinum as an additional metal.
- An iridium catalyst produced in the same process as in Example 7 (iridium supported amount: 1 wt%) 1 ⁇ impregnated with 0.059 g of a dinitrodiamine platinum solution having a platinum concentration of 8.476 wt% (Iridium carrying amount: 1% by weight, platinum carrying amount: 0.5% by weight).
- Example 10 A catalyst was produced by supporting ceria-zirconia-yttria as a carrier, iridium as a catalyst metal, and ruthenium as an additional metal.
- Iridium catalyst produced in the same process as in Example 7 iridium supported amount: 1% by weight
- lg was impregnated with 0.022 g of a 4.5% noretenium nitrate solution to give an iridium-ruthenium catalyst (iridium supported amount) : 1 weight 0/0, ruthenium weight:. 0 1 weight 0/0).
- Example 1 Mixed powder (carbon fine powder content: 5 wt%) in which the catalyst and fine carbon powder were mixed was heated to produce carbon. Combustion performance was examined using TG-DTA after burning fine powder. Table 5 shows the results.
- Example 11 Here, a catalyst was produced by using praseodymium lanthanum monoxide as a carrier and platinum as a catalyst metal. 0.094 g of platinum solution with platinum concentration of 8.476% by weight was impregnated with lg ceria-praseodymium oxide-lanthanum oxide powder (average particle size about 5 zm), dried, and then at 500 ° C for 2 hours. Baked. Thereafter, chlorine and impurities were washed, filtered and dried overnight at 120 ° C. to obtain a catalyst. The amount of platinum supported on this catalyst was 0.8% by weight.
- Example 12 Next, a catalyst was prepared by supporting praseodymium lanthanum monoxide as a carrier and iridium as a catalyst metal.
- An iridium-containing iridium salt solution having an iridium content of 1.0% was impregnated with lg ceria praseodymium lanthanum monoxide powder, dried, and calcined at 500 ° C. for 2 hours. Thereafter, chlorine and impurities were washed, filtered, and dried overnight at 120 ° C. to obtain a catalyst.
- the amount of iridium supported was adjusted by adjusting the amount of iridium chloride used, and catalysts with iridium loading of 0.5%, 1%, 3%, 10% and 20% by weight were produced.
- Example 2 For the produced catalyst, as in Example 1, mixed powder (carbon fine powder content: 5 wt%) in which the catalyst and fine carbon powder were mixed was heated to burn the fine carbon powder. Combustion performance was examined using DTA. Table 7 shows the results.
- the start temperature of combustion can be further lowered by using iridium as the catalyst metal.
- iridium as the catalyst metal.
- those having a weight of 10% by weight or less were able to make the combustion start temperature less than 300 ° C., and particularly preferable results were obtained.
- ⁇ M l ⁇ A catalyst was produced by using praseodymium ceria and zirconium oxide as a carrier, iridium as a catalyst metal, and silver as an additional noble metal. Iridium content 1.0. /.
- the lg of iridium chloride solution lg was impregnated with lg ceria-zircoua-praseodymium oxide powder (average particle size about 5 / m), dried, and calcined at 500 ° C. for 2 hours. Thereafter, chlorine and impurities were washed, filtered, and dried at 120 ° C. to obtain an iridium catalyst.
- Example 14 In the same manner as in Example 13, a catalyst was produced by supporting praseodymium ceria monozinoreconia monoxide as a carrier, iridium as a catalyst metal, and rhodium as an additional noble metal.
- Iridium catalyst produced in the same process as in Example 7 iridium supported amount: 1% by weight
- lg was impregnated with 0.067 g of a rhodium nitrate solution having a rhodium concentration of 3.0% by weight to obtain an iridium-rhodium catalyst (iridium (Supported amount: 1% by weight, Rhodium supported amount: 0.2% by weight).
- ⁇ M l ⁇ A catalyst was prepared by supporting praseodymium ceria and zircoure monoxide as a support, iridium as a catalyst metal, and platinum as an additional metal.
- Iridium catalyst produced in the same process as in Example 13 iridium supported amount: 1% by weight
- Iridium catalyst produced in the same process as in Example 13 (iridium supported amount: 1% by weight) 1 ⁇ was impregnated with 0.059 g of a dinitrodiammine platinum solution having a platinum concentration of 8.476% by weight, and iridium-platinum catalyst. (Iridium loading: 1 wt%, platinum loading: 0.5 wt%).
- a catalyst was produced by supporting iridium as a catalyst metal and ruthenium as an additional metal using ⁇ Ml ⁇ ceria-zircourea praseodymium as a carrier.
- Iridium catalyst produced in the same process as in Example 13 iridium loading: 1% by weight
- lg was impregnated with 0.022 g of a 4.5% ruthenium nitrate solution to give an iridium-ruthenium catalyst (iridium loading) : 1 wt%, ruthenium loading: 0.1 wt%).
- Example 2 For the catalysts of Examples 12 to 15 produced as described above, as in Example 1, mixed powder (carbon fine powder content: 5% by weight) obtained by mixing the catalyst and fine carbon powder was heated to produce Combustion performance was examined using TG-DTA after burning fine powder. Table 8 shows the results.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/586,548 US7875572B2 (en) | 2004-12-20 | 2005-12-15 | Combustion catalyst for treating diesel exhaust gas and method for treating diesel exhaust gas |
EP05816859.2A EP1712278B1 (en) | 2004-12-20 | 2005-12-15 | Combustion catalyst for treating diesel exhaust gas and method for treating diesel exhaust gas |
CN200580004890.2A CN1917957B (zh) | 2004-12-20 | 2005-12-15 | 柴油机排气处理用的燃烧催化剂以及柴油机排气的处理方法 |
JP2006522163A JP4501012B2 (ja) | 2004-12-20 | 2005-12-15 | ディーゼル排ガス処理用の燃焼触媒及びディーゼル排ガスの処理方法 |
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US (1) | US7875572B2 (ja) |
EP (1) | EP1712278B1 (ja) |
JP (1) | JP4501012B2 (ja) |
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- 2005-12-15 WO PCT/JP2005/023025 patent/WO2006068022A1/ja active Application Filing
- 2005-12-15 CN CN200580004890.2A patent/CN1917957B/zh active Active
- 2005-12-15 KR KR1020067015618A patent/KR20070057071A/ko active Search and Examination
- 2005-12-15 KR KR1020087007667A patent/KR100903468B1/ko active IP Right Grant
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Cited By (14)
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WO2007043442A1 (ja) * | 2005-10-06 | 2007-04-19 | Mitsui Mining & Smelting Co., Ltd. | パティキュレート燃焼触媒、パティキュレートフィルター及び排ガス浄化装置 |
JP2007296518A (ja) * | 2006-04-07 | 2007-11-15 | Honda Motor Co Ltd | 排ガス浄化触媒および排ガス浄化装置 |
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JP2009034661A (ja) * | 2006-11-08 | 2009-02-19 | Nissan Motor Co Ltd | Pm酸化触媒 |
WO2009025173A1 (ja) * | 2007-08-22 | 2009-02-26 | Honda Motor Co., Ltd. | 排ガス浄化触媒及びこれを用いた排ガス浄化装置 |
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JP2009078224A (ja) * | 2007-09-26 | 2009-04-16 | Denso Corp | パティキュレートマター燃焼用触媒の製造方法 |
JP2009255004A (ja) * | 2008-04-18 | 2009-11-05 | Mitsui Mining & Smelting Co Ltd | パティキュレート燃焼触媒、パティキュレートフィルター及び排ガス浄化装置 |
JP2010005580A (ja) * | 2008-06-30 | 2010-01-14 | Agc Seimi Chemical Co Ltd | 排気ガス浄化用触媒 |
WO2010041741A1 (ja) * | 2008-10-09 | 2010-04-15 | 本田技研工業株式会社 | 排ガス浄化装置 |
JPWO2010041741A1 (ja) * | 2008-10-09 | 2012-03-08 | 本田技研工業株式会社 | 排ガス浄化装置 |
JPWO2015087780A1 (ja) * | 2013-12-09 | 2017-03-16 | 株式会社キャタラー | 排ガス浄化用触媒 |
WO2018055893A1 (ja) * | 2016-09-20 | 2018-03-29 | パナソニックIpマネジメント株式会社 | 粒子状物質燃焼触媒及び粒子状物質燃焼触媒フィルタ |
Also Published As
Publication number | Publication date |
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JPWO2006068022A1 (ja) | 2008-06-12 |
EP1712278A1 (en) | 2006-10-18 |
US20080229731A1 (en) | 2008-09-25 |
US7875572B2 (en) | 2011-01-25 |
EP1712278B1 (en) | 2017-08-16 |
KR20070057071A (ko) | 2007-06-04 |
CN1917957B (zh) | 2014-07-30 |
CN1917957A (zh) | 2007-02-21 |
KR20080033554A (ko) | 2008-04-16 |
EP1712278A4 (en) | 2010-10-13 |
JP4501012B2 (ja) | 2010-07-14 |
KR100903468B1 (ko) | 2009-06-18 |
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