WO2008013169A1 - Catalyseur pour purification de gaz d'échappement - Google Patents
Catalyseur pour purification de gaz d'échappement Download PDFInfo
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- WO2008013169A1 WO2008013169A1 PCT/JP2007/064496 JP2007064496W WO2008013169A1 WO 2008013169 A1 WO2008013169 A1 WO 2008013169A1 JP 2007064496 W JP2007064496 W JP 2007064496W WO 2008013169 A1 WO2008013169 A1 WO 2008013169A1
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- WIPO (PCT)
- Prior art keywords
- catalyst
- layer
- exhaust gas
- upper layer
- noble metal
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Classifications
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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
- 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
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
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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
- 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
- B01J37/0244—Coatings comprising several layers
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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
- 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
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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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- 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
- F01N3/103—Oxidation catalysts for HC and CO only
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/908—O2-storage component incorporated in the catalyst
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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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
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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
- F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
- F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
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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
- F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
- F01N2510/0684—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having more than one coating layer, e.g. multi-layered coatings
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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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0864—Oxygen
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Definitions
- the present invention relates to an exhaust gas purifying catalyst for automobiles.
- exhaust gas purification catalysts such as an oxidation catalyst and a three-way catalyst are used. These exhaust gas purifying catalysts are obtained by supporting a noble metal such as Pt, Rh, and Pd on a carrier made of a porous oxide such as ⁇ -alumina. Porous oxide species or noble metal species can be used in various combinations depending on the purpose!
- Rh is a noble metal that has a high reduction activity and is indispensable for an exhaust gas purifying catalyst.
- the activity decreases when supported in the vicinity of Pt. Therefore, two catalyst layers are used, each supporting Pt and Rh in each layer, or a method in which Pt and Rh are supported on different oxide powders and then mixed, and Pt and Rh are separated and supported. To be done.
- ceria or ceria-zircoua solid solution has an oxygen storage / release capacity (OSC).
- OSC oxygen storage / release capacity
- Japanese Patent Application Laid-Open No. 2003-326170 and Japanese Patent Application Laid-Open No. 2004-330025 are somewhat large.
- a method is described in which an upper layer is formed from a slurry mixed with activated carbon having a particle size and the like, and the upper layer having a large porosity is formed by burning it off during firing.
- the exhaust gas purifying catalyst having the upper layer formed in this way the gas diffusibility in the upper layer is greatly improved and the contact property with the noble metal is also improved, so that the purification performance is improved.
- honeycomb substrates having innumerable cell passages are widely used as carrier substrates used for three-way catalysts and the like.
- This honeycomb substrate is made of a heat-resistant ceramic such as cordierite and has a cell passage having a square cross section.
- the honeycomb substrate is wash coated with slurry, and a coating layer is formed.
- the surface tension of the slurry causes the corner of the cell passage to be coated thicker. For this reason, when the thick part has a low gas diffusivity and a large amount of noble metal supported, the thin part has a high support density of the catalyst noble metal, which causes a problem of grain growth during use.
- Japanese Patent Application Laid-Open No. 10-263416 or Japanese Patent Application Laid-Open No. 2000-237602 describes the use of a honeycomb substrate having a cell passage having a hexagonal cross section. If a honeycomb substrate having a hexagonal cell passage is used in this way, the force S can be reduced by mitigating the phenomenon of thicker corners.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-326170
- Patent Document 2 JP 2004-330025 A
- Patent Document 3 Japanese Patent Laid-Open No. 10-263416
- Patent Document 4 JP 2000-237602
- the thickness of the lower layer is increased to increase the absolute amount of the cocatalyst having OSC, the OSC can be satisfied, and the CO purification rate in a stoichiometric to lean atmosphere is improved. If this is the case, the thickness of the entire catalyst coat layer will increase, leading to an increase in pressure loss, which will adversely affect engine performance.
- the present invention has been made in view of the above circumstances, and an object to be solved is to particularly improve the CO purification rate in a stoichiometric to lean atmosphere and to prevent an increase in pressure loss.
- the exhaust gas purifying catalyst of the present invention that solves the above problems is characterized in that a honeycomb-shaped carrier substrate having a large number of cell passages partitioned by cell partition walls, and a catalyst coating layer formed on the surface of the cell partition walls
- the catalyst coating layer is composed of a lower layer containing an oxygen storage / release material and an upper layer containing a catalyst noble metal formed on the surface of the lower layer, and the upper layer has a thickness of 5 ⁇ m to It is 40 ⁇ m.
- the upper layer has a thickness of 30 m or less! /.
- the catalyst coat layer preferably has a total thickness of 10 111 to 80 111 occupying 90% or more of the total.
- At least Rh is supported on the upper layer and at least one of Pt and Pd is supported on the lower layer.
- the upper layer has a thickness of 40 in or less, so that the gas diffusibility is excellent, and the OSC due to the oxygen storage / release material contained in the lower layer is maximized. Therefore, the CO purification rate in a stoichiometric to lean atmosphere is particularly improved. Further, since the upper layer has a thickness of 5 111 or more, the grain growth of the catalyst noble metal during use is suppressed. Therefore, the durability of the purification performance is excellent! [0019] Further, if the total thickness of the catalyst coating layer is in the range of 10 m to 80 m occupies 90% or more of the total, it is possible to avoid an increase in pressure loss while ensuring an absolute amount of oxygen absorption / release. it can
- FIG. 1 is a perspective view of an exhaust gas purifying catalyst according to an embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view of a main part of an exhaust gas purifying catalyst according to an embodiment of the present invention.
- FIG. 3 is a graph showing the relationship between the air-fuel ratio and the purification rate in the catalyst of Example 1.
- FIG. 4 is a graph showing the relationship between the air-fuel ratio and the purification rate in the catalyst of Comparative Example 1.
- FIG. 5 is a graph showing the oxygen storage capacity of the catalysts of Example 1 and Comparative Example 1.
- FIG. 6 is a graph showing the relationship between the precious metal loading position and catalyst efficiency.
- the exhaust gas-purifying catalyst of the present invention comprises a support substrate and a catalyst coat layer.
- the carrier substrate is in the form of a honeycomb having a large number of cell passages partitioned by cell partition walls, and is a monolith substrate formed from a heat-resistant ceramic such as cordierite, a certain layer, or a corrugated sheet made of metal foil.
- stacked the flat plate alternately can be used.
- the number of cell passages or the cross-sectional area thereof those conventionally used can be used.
- the number of cells is 400 to 900 / in 2
- the maximum diameter of the cell passage is 700 m to 1300 m.
- a catalyst coat layer is formed on the surface of the cell partition wall.
- the catalyst coat layer is composed of a lower layer containing an oxygen absorbing / releasing material and an upper layer formed on the surface of the lower layer and containing a catalyst noble metal.
- the upper layer and the lower layer are reversed, the catalytic action of the catalytic noble metal contained in the upper layer is lowered, which is not practical.
- the oxygen storage / release material contained in the lower layer includes CeO, CeO 2 -ZrO composite oxide,
- Examples include CeO ZrO — A1 0 complex oxide. A10, TiO, ZrO and many others
- this lower layer carry at least one selected from the forces S, Pt, and Pd that can develop a certain amount of OSC without carrying a catalyst noble metal. This further improves OSC.
- the formation amount of the lower layer is preferably 50 to 250 g per liter of the catalyst. This is 5m ⁇
- the amount of the lower layer is less than this range, the absolute amount of oxygen absorbed and released becomes insufficient. Further, when the catalyst noble metal is supported, the density of the support increases, so that the grain growth is caused by heat at the time of use and the activity decreases. If the amount of the lower layer formed exceeds this range, the upper layer is supported with an extremely thin thickness of less than 5 m, resulting in grain growth of the catalyst noble metal, or the upper layer thickness of 5 Hm. Even in the range of ⁇ 40 [I m, the pressure loss increases as the total thickness of the catalyst coat layer increases.
- the amount of catalyst noble metal supported in the lower layer is preferably 0.1 to 10 g per liter of the catalyst. If the loading amount is less than this range, the OSC becomes insufficient and the CO purification rate in the stoichiometric / lean atmosphere decreases, and even if the loading amount exceeds this range, the effect is saturated and the activity is increased by the grain growth during use. Deteriorating defects occur.
- the upper layer essentially includes a catalyst noble metal, and includes a support made of a porous oxide and a catalyst noble metal. It is desirable to use at least Rh, which has excellent power NO purification activity, which can be selected from Pt, Rh, Pd, Ir, etc. as the catalyst noble metal.
- a porous oxide is A10,
- porous oxides can be used in combination with CeO.
- the upper layer is formed to a thickness of 5111 to 40111. This corresponds to 50 g to 250 g per liter of catalyst.
- the thickness of the upper layer is less than this range, the support density of the catalyst noble metal increases, so that the grains grow due to heat during use and the activity decreases. Further, if the amount of formation in the upper layer exceeds this range, the gas diffusibility deteriorates, the 0 SC due to the oxygen storage / release material in the lower layer decreases, and the CO purification rate in a stoichiometric to lean atmosphere significantly decreases. Further, the pressure loss increases as the total thickness of the catalyst coat layer increases.
- the upper layer thickness is more preferably 30 m or less.
- the amount of catalyst noble metal supported in the upper layer is preferably 0.1 to 3 g per liter of the catalyst. Good. If the loading amount is less than this range, the purification activity by the catalyst noble metal is lowered, and even if the loading is larger than this range, the effect is saturated, and there is a problem that the activity is lowered due to grain growth during use.
- the total thickness of the catalyst coat layer be 90% or more in the range of 10 Hm to 80 ⁇ m.
- a total thickness of 10 to 111 to 80 in corresponds to 120 to 350 g of catalyst coat layer formed per liter of catalyst. If the total thickness is less than 10 m, the supported density of the catalyst noble metal becomes too high and the activity decreases due to grain growth, and if it exceeds 80 m, the pressure loss increases.
- the coating thickness varies depending on the cross-sectional shape of the cell passage. In the case of a general square cell, the corner becomes thicker. If 150 g or more is coated per liter of catalyst, the thickness of the corner exceeds 80 m. In areas other than the corner, the thickness is often less than 5 m and is too thin.
- the force S can be reduced by reducing the difference in thickness between the corner portion and the flat portion.
- multiple coatings are required to ensure the specified coating amount. Therefore, not only the cost is increased, but also the maximum inner diameter of the cell passage after coating is shortened (hydraulic diameter is shortened) as compared with the case where a slurry having high viscosity is coated. Therefore, even if the same amount of coating layer is formed, there is a problem that the pressure loss increases when the low viscosity slurry is coated multiple times.
- a honeycomb substrate having a polygonal cross-section cell passage having a hexagonal cross section or more instead of the honeycomb base material having a square cross-section cell passage.
- the corner portion may be filled with a heat-resistant material in advance to form a polygonal cell having a hexagonal cross section or more.
- a honeycomb substrate with a hexagonal cross section cell passage is used, even if the same amount of coat layer is formed, the pressure loss is about 12% lower than when a honeycomb substrate with a square cross section cell passage is used. Can be reduced.
- This catalyst is a cell The honeycomb base material 1 having only the hexagonal cell passages 11 partitioned by the partition walls 10, the catalyst coating layer 2 formed on the surface of the cell partition walls 10, and the like.
- the catalyst coat layer includes a lower layer 20 formed on the surface of the cell partition wall 10 and an upper layer 21 formed on the surface of the lower layer 20.
- a predetermined amount of CeO 2 -ZrO composite oxide powder is mixed in a predetermined amount of water, and stirred while stirring.
- a predetermined amount of ZrO powder is mixed in a predetermined amount of water, and while stirring, the Rh nitric acid chemical solution is mixed.
- Rh / ZrO powder carrying Rh A predetermined amount was added. This was evaporated to dryness with stirring, and then calcined at 250 ° C for 1 hour to prepare Rh / ZrO powder carrying Rh. The amount of Rh supported is 0.5% by mass.
- Minasol 50 parts by mass and 25 parts by mass of water were mixed and milled with a ball mill to prepare slurry (R).
- cordierite honeycomb substrate 1 (3.5 mil, 600 cells, capacity 0.9 L) having hexagonal cells is prepared, immersed in slurry (soot), and then extra in a suction coater. The slurry was sucked, dried at 120 ° C for 30 minutes, and calcined at 250 ° C for 2 hours. As a result, 175 g of the lower layer 20 per liter of the honeycomb substrate 1 was formed on the surface of the cell partition wall 10.
- the catalyst coating layer 2 was formed in an amount of 255 g per liter of the honeycomb substrate 1, and the noble metal loading per liter of the honeycomb substrate 1 was PS 1.5 g, Rh Is 0.3g. [0044] (Comparative Example 1)
- An exhaust gas purification catalyst of Comparative Example 1 was prepared in the same manner as Example 1 except that a honeycomb substrate having only square cells (3.5 mil, 600 cells, capacity 0.9 L) was used.
- Example 1 For the catalysts of Example 1 and Comparative Example 1, the thickness of the catalyst coat layer at the corner and the flat portion was measured by microscopic observation. The results are shown in Table 1.
- Example 1 The three-way catalysts of Example 1 and Comparative Example 1 were converted into converters and attached to both banks of the V-type 8-cylinder gasoline engine. Then, an endurance test was performed for 50 hours, in which the fuel was cut for 3 seconds every 10 seconds under the condition of a catalyst bed temperature of 900 ° C. The bank was replaced in 25 hours.
- FIG. 3 and FIG. 4 shows that the catalyst of Example 1 has a significantly higher CO purification rate in the stoichiometric to lean atmosphere than the catalyst of Comparative Example 1. It is known that the oxidation reaction of CO is mostly due to the catalytic action of Pt. The supported Pt is used more effectively than Comparative Example 1.
- the oxygen storage capacity of the catalyst of Example 1 is improved by about 23% compared to the catalyst of Comparative Example 1, and the catalytic activity of the noble metal is improved in the catalyst of Example 1 due to the relaxation of atmospheric fluctuations. It is inferred that it has improved.
- these effects are as follows: the total thickness of the corner is as thin as 85 mm, and the thickness of the upper layer 11 is in the range of 15 to 25 m in the flat and corner areas. And thinly formed! /, Due to that! /, The power S is obvious.
- the thickness of the coat layer is constant, the upper layer supported product in which the noble metal is supported only within the range of 30 m from the surface of the coat layer, and the coat layer
- An intermediate-layer-supported product in which a noble metal was supported only in the range of 30 to 80 m from the surface of the coating and a lower-layer-supported product in which a noble metal was supported only in a range of 81 am or more from the surface of the coat layer were prepared.
- the Cmax value of the lower layer supported product is 0.167.
- the catalyst efficiency of the lower layer supported product is calculated to be about 8% of the catalyst efficiency of the upper layer supported product.
- the catalyst efficiency of the intermediate layer supported product was calculated, and the result is shown in FIG. From FIG. 6, it is clear that the catalyst efficiency decreases as the noble metal loading position becomes deeper, and it is desirable that the noble metal is loaded in the range from the surface of the coat layer to 80111.
- the total thickness of the catalyst coat layer in the range of 10 m to 80 m, it is possible to ensure that the noble metal loading position is in the range of 80 in from the surface of the coat layer, which is particularly preferable. Gagawa power.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/375,013 US7759283B2 (en) | 2006-07-25 | 2007-07-24 | Catalyst for purifying exhaust gas |
EP07791222A EP2047904A4 (en) | 2006-07-25 | 2007-07-24 | CATALYST FOR EXHAUST GAS PURIFICATION |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006202099A JP2008023501A (ja) | 2006-07-25 | 2006-07-25 | 排ガス浄化用触媒 |
JP2006-202099 | 2006-07-25 |
Publications (1)
Publication Number | Publication Date |
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WO2008013169A1 true WO2008013169A1 (fr) | 2008-01-31 |
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ID=38981480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/064496 WO2008013169A1 (fr) | 2006-07-25 | 2007-07-24 | Catalyseur pour purification de gaz d'échappement |
Country Status (7)
Country | Link |
---|---|
US (1) | US7759283B2 (ja) |
EP (1) | EP2047904A4 (ja) |
JP (1) | JP2008023501A (ja) |
KR (1) | KR20090025361A (ja) |
CN (1) | CN101495233A (ja) |
RU (1) | RU2009102253A (ja) |
WO (1) | WO2008013169A1 (ja) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008029970A (ja) * | 2006-07-28 | 2008-02-14 | Toyota Motor Corp | ガス浄化触媒 |
EP2112339A1 (de) * | 2008-04-24 | 2009-10-28 | Umicore AG & Co. KG | Verfahren und Vorrichtung zur Reinigung von Abgasen eines Verbrennungsmotors |
JP5492448B2 (ja) * | 2009-04-28 | 2014-05-14 | 株式会社キャタラー | 排ガス浄化用触媒 |
US8246923B2 (en) * | 2009-05-18 | 2012-08-21 | Umicore Ag & Co. Kg | High Pd content diesel oxidation catalysts with improved hydrothermal durability |
US8207084B2 (en) * | 2009-06-23 | 2012-06-26 | Ford Global Technologies, Llc | Urea-resistant catalytic units and methods of using the same |
US8557203B2 (en) * | 2009-11-03 | 2013-10-15 | Umicore Ag & Co. Kg | Architectural diesel oxidation catalyst for enhanced NO2 generator |
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Also Published As
Publication number | Publication date |
---|---|
US7759283B2 (en) | 2010-07-20 |
CN101495233A (zh) | 2009-07-29 |
EP2047904A1 (en) | 2009-04-15 |
KR20090025361A (ko) | 2009-03-10 |
EP2047904A4 (en) | 2009-09-02 |
US20090239745A1 (en) | 2009-09-24 |
JP2008023501A (ja) | 2008-02-07 |
RU2009102253A (ru) | 2010-07-27 |
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