CN208057201U - Novel 3rd areas, two layers of TWC catalyst for gasoline exhaust gas application - Google Patents
Novel 3rd areas, two layers of TWC catalyst for gasoline exhaust gas application Download PDFInfo
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Abstract
Disclose three-way catalyst product, and its purposes in the exhaust system for internal combustion engine.Catalyst article for handling exhaust gas, it includes：Including arrival end, outlet end and the carrier with axial length L；Start from the arrival end and extend less than the catalyst at inlet layer of the axial length L, wherein the catalyst at inlet layer includes inlet palladium component；Start from the outlet end and extend less than the outlet catalyst layer of the axial length L, wherein the outlet catalyst layer includes outlet rhodium component；Wherein the outlet catalyst layer is Chong Die with the catalyst at inlet layer.
Description
Technical field
The catalytic article that the utility model is related to be discharged for handling the exhaust gas of gasoline engine.
Background technology
Internal combustion engine generates the exhaust gas containing multiple pollutant, and pollutant includes hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxidation
Object (" NOx").The emission control systems comprising exhaust gas catalyst are widely used and arrive air to reduce these pollutant emissions
Amount.Custom catalysts for gasoline engine application are TWC.TWC executes three major functions：(1) oxidation of CO；(2) unburned
HC oxidation；(3) NOxIt is reduced to N2。
In most catalytic converters, TWC is applied to the high surface area carrier such as flow type honeycomb that can bear high temperature
On body material all in one piece.The high surface area of these carriers promotes required heterogeneous reaction, but will also result in increasing for exhaust back pressure, i.e.,
Limitation exhaust gas flows to exhaust pipe from engine.High back pressure in exhaust system can reduce engine fuel economy and power it is defeated
Go out.Although TWC technologies achieve progress, such as United States Patent (USP) 6,022,825, United States Patent (USP) 9,352,279, United States Patent (USP) 9,040,
003 and U.S. Patent Publication 2016/0228818 described in those of, but there is still a need for the improvement for certain engine flats
Catalytic converter, simultaneously generate high conversion rate and low back pressure.The utility model especially solves these needs.
Utility model content
The one side of the utility model is related to the catalyst article for handling exhaust gas, it includes：Including arrival end, go out
Mouth end and the carrier with axial length L；Start from the arrival end and extend less than the catalyst at inlet layer of the axial length L,
Wherein the catalyst at inlet layer includes inlet palladium component；Start from the outlet end and extend less than the outlet of the axial length L urging
Agent layer, wherein the outlet catalyst layer include outlet rhodium component；Wherein the outlet catalyst layer and the catalyst at inlet layer
Overlapping.
The utility model further includes the exhaust system for internal combustion engine, and it includes the three-way catalyst portions of the utility model
Part.
Description of the drawings
Fig. 1 shows the catalyst article with catalyst at inlet layer and outlet catalyst layer.Catalyst at inlet layer is complete
Ground is directly loaded/is deposited on carrier.Outlet catalyst layer is partly directly loaded/is deposited on carrier, and partly load/
It is deposited on the upper surface of catalyst at inlet layer.
Fig. 2 shows the catalyst article with catalyst at inlet layer and outlet catalyst layer.It is complete to export catalyst layer
Ground is directly loaded/is deposited on carrier.Directly loads/be deposited on carrier to catalyst at inlet layer segment, and partly load/
It is deposited on the upper surface of outlet catalyst layer.
Fig. 3 shows the commercial catalysts product of comparison, and there are two catalyst layers for tool on the carrier in the same region.
Specific implementation mode
The utility model is related to the catalyzed conversions for the exhaust gas that burning waste gas is such as generated by gasoline engine or other engines, and relate to
And relevant catalytic article and system.More specifically, the utility model is related to the NO in vehicle exhaust systemx, CO and HC it is same
When purify.The inventors discovered that conspiracy relation between certain catalytically-active metals and their orientation, unexpectedly
Generate NOx, CO and HC high conversion, while reducing exhaust back pressure.
The one side of the utility model is related to the catalyst article for handling exhaust gas, it includes：Including arrival end, go out
Mouth end and the carrier with axial length L；Start from the arrival end and extend less than the catalyst at inlet layer of the axial length L,
Wherein the catalyst at inlet layer includes inlet palladium component；Start from the outlet end and extend less than the outlet of the axial length L urging
Agent layer, wherein the outlet catalyst layer include outlet rhodium component；Wherein the outlet catalyst layer and the catalyst at inlet layer
Overlapping.
The catalyst article of the utility model can be divided into three catalyst zones along the axis of carrier：Entrance is merely coated with to urge
The upstream of agent layer, is coated with the middle area of entrance and exit catalyst layer, and is merely coated with the catchment of outlet catalyst layer.
The inventors discovered that this catalyst comprising a variety of orientations generates in terms of improving catalytic performance and reducing back pressure
Synergistic effect, this is can not achieve using catalyst that is individual or being conventionally orientated.The unexpected benefit of the utility model
The lower back pressure compared with the conventional TWC catalyst of similar concentration (carrier coating (washcoat) load capacity), and with routine
TWC catalyst is compared to (or even when routine TWC has higher concentration) improved catalyst performance.These benefits are improved
Engine performance, improved fuel economy and lower cost.
The catalyst at inlet layer of catalyst article can extend the 50-99% of axial length L.Preferably, catalyst at inlet
Layer can extend 55-95%, the 60-90% of axial length L, more preferable 65-85%.(for example, see Fig. 1 and 2)
The outlet catalyst layer of catalyst article can extend the 50-99% of axial length L.Preferably, catalyst is exported
Layer can extend 55-95%, the 60-90% of axial length L, more preferable 65-85%.(for example, see Fig. 1 and 2)
Catalyst at inlet layer can be substantially free of the PGM metals except inlet palladium component.
Catalyst at inlet layer can include at most 300g/ft3Inlet palladium component.Preferably, catalyst at inlet layer can be with
Including 10-200g/ft3, more preferable 20-150g/ft3Inlet palladium component.
Catalyst at inlet layer can further include entrance inorganic oxide material, storage oxygen (OSC) material, entrance alkali metal
Or alkaline earth metal component and/or entrance inorganic oxide.
Total carrier coating load capacity of catalyst at inlet layer can be 0.1-5g/in3.Preferably, catalyst at inlet layer
Total carrier coating load capacity is 0.5-3.5g/in3, most preferably, total carrier coating load capacity of catalyst at inlet layer is 1-
2.5g/in3。
Entrance OSC material is selected from cerium oxide, zirconium oxide, Ceria-zirconia mixed oxide and alumina-thoria-
Zirconia mixed oxide.It is highly preferred that entrance OSC material includes Ceria-zirconia mixed oxide.Cerium oxide-oxidation
Zr mixed oxide can further include some dopants, such as La, Nd, Y, Pr.
Ceria-zirconia mixed oxide can have zirconium oxide and cerium oxide at least 50:50, preferably greater than 60:40,
More preferably greater than 75:25 molar ratio.In addition, entrance OSC material can serve as the carrier material of inlet palladium component.
Entrance OSC material (such as Ceria-zirconia mixed oxide) can be total load based on catalyst at inlet layer
Body coating load gauge 10-90wt%, preferably 25-75wt%.More preferable 35-65wt%.
Entrance OSC material load capacity in catalyst at inlet layer can be less than 1.5g/in3.In some embodiments, enter
Entrance OSC material load capacity in mouth catalyst layer is not more than 1.2g/in3, 1.0g/in3, 0.9g/in3, 0.8g/in3, 0.7g/
in3Or 0.6g/in3。
In some embodiments, entrance alkali or alkaline earth metal can be deposited in entrance OSC material.Alternatively or
Additionally, entrance alkali or alkaline earth metal can be deposited on entrance inorganic oxide.I.e. in some embodiments, entrance
Alkali or alkaline earth metal can be deposited on, that is, be present in entrance OSC material and entrance inorganic oxide the two.
Preferably, entrance alkali or alkaline earth metal is loaded/is deposited on entrance inorganic oxide (such as aluminium oxide).It is right
For being contacted with entrance inorganic oxide additionally or alternatively, entrance alkali or alkaline earth metal can be with entrance OSC materials
Material also has inlet palladium component contact.
Entrance alkali or alkaline earth metal is preferably barium or strontium.Preferably, when it is present, the amount of barium or strontium be based on
The barium content of the total weight 0.1-15wt%, more preferable 3-10wt% of catalyst at inlet layer.
Preferably, barium is as BaCO3Form exists.Such material can in any method known in the art, such as
Incipient wetness impregnation is spray-dried to obtain.
Entrance inorganic oxide is preferably the oxide of the race of the 2nd, 3,4,5,13 and 14 element.Entrance inorganic oxide is preferred
Selected from aluminium oxide, cerium oxide, magnesia, silica, niobium oxide, lanthanum, zirconium, neodymium, praseodymium oxide and its mixed oxide or again
Close oxide.It is particularly preferred that entrance inorganic oxide is aluminium oxide, lanthanum/alumina composite oxide or magnesia/aluminium oxide
Composite oxides.A kind of especially preferred entrance inorganic oxide is lanthanum/alumina composite oxide or magnesia/aluminium oxide.
Entrance inorganic oxide can be the carrier material for inlet palladium component and/or for entrance alkali or alkaline earth metal.
Preferred entrance inorganic oxide preferably has greater than 80m2The fresh surface area of/g, the pore volume of 0.1-4mL/g.
Particularly preferably have and is more than 100m2The high surface area inorganic oxide of the surface area of/g, such as high surface area alumina.Other are excellent
The entrance inorganic oxide of choosing includes lanthanum/alumina composite oxide, optionally further includes cerium component such as cerium oxide.?
In the case of in this way, cerium oxide can reside on the surface of the lanthanum/alumina composite oxide, such as coating.
Entrance OSC material and entrance inorganic oxide, which can have, is not more than 10:1, preferably no greater than 8:1 or 5:1, it is more excellent
Choosing is not more than 4:1 or 3:1, most preferably no greater than 2:1 weight ratio.
Alternatively, entrance OSC material and entrance inorganic oxide can have 10:1-1:10, preferably 8:1-1:8 or 5:1-
1:5, more preferable 4:1-1:4 or 3:1-1:3, most preferably 2:1-1:2 weight ratio.
Exporting catalyst layer can be substantially free of the PGM metal except outlet rhodium component.
It can includes 1-20g/ft to export catalyst layer3Outlet rhodium component.Preferably, outlet catalyst layer can include
2-15g/ft3, more preferable 3-10g/ft3Outlet rhodium component.
The total carrier coating load capacity for exporting catalyst layer can be 0.1-3.5g/in3.Preferably, catalyst layer is exported
Total carrier coating load capacity be 0.5-3g/in3, most preferably, the total carrier coating load capacity for exporting catalyst layer is 0.6-
2g/in3。
Outlet catalyst layer can further include outlet storage oxygen (OSC) material, outlet alkali or alkaline earth metal component
And/or outlet inorganic oxide.
Outlet OSC material is preferably selected from cerium oxide, zirconium oxide, Ceria-zirconia mixed oxide and alumina-silica
Cerium-zirconia mixed oxide.It is highly preferred that outlet OSC material includes Ceria-zirconia mixed oxide.Cerium oxide-oxygen
Some doped chemicals, such as lanthanum, neodymium, praseodymium, yttrium can be further included by changing Zr mixed oxide.
Ceria-zirconia mixed oxide can have zirconium oxide and cerium oxide at least 50:50, preferably greater than 60:40,
More preferably greater than 80:20 molar ratio.In addition, outlet OSC material can serve as the carrier material of outlet rhodium component.
It can be that total carrier coating based on outlet catalyst layer loads gauge to export OSC material (such as loose cerium oxide)
10-90wt%, preferably 25-75wt%, more preferable 35-65wt%.
Outlet OSC material load capacity in outlet catalyst layer can be less than 1.5g/in3.In some embodiments, go out
Outlet OSC material load capacity in mouth catalyst layer is not more than 1.2g/in3, 1.1g/in3Or 1.0g/in3。
It is preferably barium or strontium to export alkali or alkaline earth metal.Preferably, when it is present, the amount of barium or strontium be based on
Export the barium content of the total weight 0.1-15wt%, more preferable 3-10wt% of catalyst layer.
Preferably, barium is as BaCO3Form exists.Such material can in any method known in the art, such as just
Wet impregnation is spray-dried to obtain.
It exports catalyst layer and is preferably generally free of outlet alkali or alkaline earth metal.It is highly preferred that outlet catalyst layer
Substantially free of outlet alkali or alkaline earth metal.
Outlet inorganic oxide is preferably the oxide of the race of the 2nd, 3,4,5,13 and 14 element.It is preferred to export inorganic oxide
Selected from aluminium oxide, zirconium oxide, magnesia, silica, niobium oxide, lanthanum, zirconium, neodymium, praseodymium oxide and its mixed oxide or again
Close oxide.It is particularly preferred that outlet inorganic oxide is aluminium oxide, lanthanum/alumina composite oxide or magnesia/aluminium oxide
Composite oxides.A kind of especially preferred outlet inorganic oxide be lanthanum/alumina composite oxide or magnesia/aluminium oxide or
Zirconium/alumina composite oxide.Outlet inorganic oxide can be the carrier material for outlet rhodium component.
Exporting OSC material and outlet inorganic oxide can have no more than 10:1, preferably no greater than 8:1 or 5:1, it is more excellent
Choosing is not more than 4:1, most preferably no greater than 3:1 weight ratio.
Alternatively, outlet OSC material and outlet inorganic oxide can have 10:1-1:10, preferably 8:1-1:8 or 5:1-
1:5, more preferable 4:1-1:4, most preferably 3:1-1:3 weight ratio.
In some embodiments, outlet rhodium component and inlet palladium component have 60:1-1:60 weight ratio.Preferably,
Outlet rhodium component and inlet palladium component have 30:1-1:30 weight ratio.It is highly preferred that outlet rhodium component and inlet palladium component tool
Have 20:1-1:20 weight ratio.Most preferably, outlet rhodium component and inlet palladium component have 15:1-1:15 weight ratio.
The catalyst article of the utility model can include other components well known by persons skilled in the art.For example, this reality
At least one binder and/or at least one surfactant can be further included with novel composition.It is bonded when existing
When agent, preferably dispersible alumina binder.
Preferably, carrier is flow type material all in one piece or wall-flow type gasoline particles filter.It is highly preferred that carrier is that flow type is whole
Material.
Carrier lengths can be less than 100mm, preferably 50-90mm.
Flow type monolith carrier has defines longitudinal the first face and the second face therebetween.Flow type monolith carrier has more
A channel extended between the first face and second face.Multiple channels extend in the longitudinal direction, provide multiple inner surfaces and (such as limit
The surface of the wall in each channel).Multiple channels each have the opening in the opening in the first face and in the second face.To avoid doubting
Justice, flow type monolith carrier are not wall-flow filters.
First face is usually in the arrival end of carrier, and the second face is in the outlet end of carrier.
Channel can be constant width, and multiple channels can each have uniform channel width.
Preferably, with longitudinally perpendicular plane in, monolithic substrate has 100-900 channel per square inch, excellent
Select 300-750.For example, on the first face, the density of open first passage and closed second channel is per square inch
300-750 channel.Channel can have rectangle, square, circle, ellipse, triangle, hexagon or other geometries
Cross section.
Monolithic substrate serves as the carrier material for being used to support catalysis material.It is used to form the suitable material of monolithic substrate
Including Ceramic Like material, such as cordierite, silicon carbide, silicon nitride, zirconium oxide, mullite, spodumene, alumina silica, oxygen
Change magnesium or zirconium silicate or porous refractory metal.Such material and their applications in manufacture porous monolith carrier are
It is well known in field.
It should be noted that flow-through monolith as described herein is single component (i.e. monolithic support).But, work as formation
When discharge treating system, multiple channels can be by being bonded together or by by multiple smaller this paper by carrier used
The carrier binder is formed together.The suitable shell and construction of such technology and discharge treating system is this
It is well known in field.
In the catalyst article of the utility model includes the embodiment of ceramic monolith, which can be by any
Suitable heat-resisting material is made, the heat-resisting material for example aluminium oxide, silica, titanium dioxide, cerium oxide, zirconium oxide,
Magnesia, zeolite, silicon nitride, silicon carbide, zirconium silicate, magnesium silicate, aluminosilicate and metal aluminosilicates (such as cordierite and
Spodumene) or its arbitrary mixture or mixed oxide of two or more.Particularly preferred cordierite, Almasilate and carbon
SiClx.
In the catalyst article of the utility model includes the embodiment of metallic carrier, which can be by any
Suitable metal, especially heating resisting metal and metal alloy are made, the heating resisting metal and metal alloy such as titanium and stainless steel with
And there is the Alfer of other trace metals containing iron, nickel, chromium and/or aluminium.
As shown in fig. 1, catalyst at inlet layer is fully directly on load/deposition vehicle.Export catalyst layer partly
It directly loads/is deposited on carrier, and partly load/be deposited on above catalyst at inlet layer.So middle area includes entrance
Both catalyst layer and outlet catalyst layer.
As shown in Figure 2, outlet catalyst layer is fully directly loaded/is deposited on carrier.Catalyst at inlet layer segment
Ground is directly loaded/is deposited on carrier, and is partly loaded/be deposited on above outlet catalyst layer.So middle area includes
Mouth both catalyst layer and catalyst at inlet layer.
Catalytic converter equipped with the TWC manufactured according to the utility model is not only shown to be improved compared with conventional TWC
Or comparable catalyst performance, and in terms of showing back pressure significant improvement (for example, see 1 He of Examples 1 and 2 and table
2)。
The another aspect of the utility model is related to the system for handling vehicle exhaust, which includes as described herein urge
Agent product, together with the exhaust pipe for the exhaust gas to be conveyed to the system.
Definition
Term " carrier coating " is it is well known in the art that referring to usually being administered to carrier in producing catalyst process
Adhesive coatings.
Abbreviation " PGM " used herein refers to " platinum group metal ".Term " platinum group metal " refer generally to selected from Ru,
The metal of Rh, Pd, Os, Ir and Pt are preferably selected from the metal of Ru, Rh, Pd, Ir and Pt.Generally speaking, term " PGM " is preferred
Refer to the metal selected from Rh, Pt and Pd.
Terms used herein " mixed oxide " refer generally to the hopcalite of single-phase, such as this field
In it is conventionally known.Terms used herein " composite oxides " refer generally to the group with the oxide more than a phase
Object is closed, as conventionally known in this field.
Expression " mainly by ... form " used herein by characteristic range be limited to include the material specified or step with
The not any other materials or step of the fundamental characteristics of materially affect this feature, such as a small amount of impurity.Expression is " mainly by ... group
At " include expression " by ... form ".
Usually in the context of the content in region, the areas Ceng Huo, the expression " being generally free of " herein for materials'use is anticipated
Think of is that the material is a small amount of, such as≤5wt%, preferably≤2wt%, more preferably≤1wt%.Expression is included in expression " being generally free of "
" not including ".
Usually in the context of the content in region, the areas Ceng Huo, anticipate herein for the expression substantially free of materials'use
Think of is that the material is trace, such as≤1wt%, preferably≤0.5wt%, more preferably≤0.1wt%.Expression substantially free is included
It expresses " not including ".
Herein in use any dopant referred to amount, especially total amount indicates with wt%, refer to carrier material or
The weight of its refractory metal oxide.
Terms used herein " load capacity " refer to the measurement based on weight metal, unit g/ft3。
Following embodiment only illustrates the utility model.Those skilled in the art will appreciate that the utility model purport and right
Many variations within the scope of claim.
Embodiment
Material
All material is commercially available and obtained from known suppliers, unless otherwise noted.
Catalyst 1 (comparison)
Catalyst 1 is business ternary (Pd-Rh) catalyst for having double-layer structure (such as shown in Figure 3).Bottom by
Pd is supported in the coating being made of the first CeZr mixed oxides, the stabilized aluminium oxide of La and Ba auxiliary agents.The coating of bottom
Load capacity is about 2.2g/in3, wherein Pd load capacity is 75g/ft3.Upper layer is supported on by Rh by the 2nd CeZr mixed oxides, La
In the coating of stabilized aluminium oxide composition.The carrier coating load capacity on upper layer is about 1.6g/in3, wherein Rh load capacity is 5g/
ft3.Total carrier coating load capacity of catalyst 1 is about 3.8g/in3。
Catalyst 2
Catalyst 2 is prepared according to the utility model.Bottom is supported on by Pd by entrance CeZr mixed oxides, La stabilizations
In the aluminium oxide of change, the coating of Ba auxiliary agents composition.The carrier coating load capacity of bottom is about 2.2g/in3, wherein Pd load capacity is
75g/ft3.Upper layer is supported on by Rh on the coating being made of outlet CeZr mixed oxides, the stabilized aluminium oxide of La.Upper layer
Carrier coating load capacity be about 1.6g/in3, wherein Rh load capacity is 5g/ft3.Catalyst 2 total carrier coating load capacity (in
Between area) be about 3.8g/in3。
Using standard application program, by the final base pastes containing Pd from the entrance of carrier identical with comparative catalyst 1
Face coats, and target coat depth is the 80% of carrier lengths, in 90 DEG C of dryings.It then, will be containing Rh's using standard application program
For upper slurry from the exit face coating of the carrier containing dry bottom, target coat depth is 80%, Zhi Hou of carrier lengths
90 DEG C of dryings are calcined 45 minutes at 500 DEG C.
Catalyst 3
Catalyst 3 is prepared according to the utility model.Bottom is supported on by Pd by entrance CeZr mixed oxides, La stabilizations
In the aluminium oxide of change, the coating of Ba auxiliary agents composition.The carrier coating load capacity of bottom is about 1.9g/in3, wherein Pd load capacity is
75g/ft3.Upper layer is supported on by Rh by exporting CeZr mixed oxides, the stabilized aluminium oxide of La forms.The carrier on upper layer applies
Layer load capacity is about 1.5g/in3, wherein Rh load capacity is 5g/ft3.Total carrier coating load capacity (middle area) of catalyst 3 is
About 3.4g/in3。
Using standard application program, by the final base pastes containing Pd from the entrance of carrier identical with comparative catalyst 1
Face coats, and target coat depth is the 80% of carrier lengths, in 90 DEG C of dryings.It then, will be containing Rh's using standard application program
For upper slurry from the exit face coating of the carrier containing dry bottom, target coat depth is 80%, Zhi Hou of carrier lengths
90 DEG C of dryings are calcined 45 minutes at 500 DEG C.
Catalyst 4
Catalyst 4 is prepared according to the utility model.Bottom is supported on by Pd by entrance CeZr mixed oxides, La stabilizations
In the aluminium oxide of change, the coating of Ba auxiliary agent agent composition.The carrier coating load capacity of bottom is about 1.7g/in3, wherein Pd load capacity
For 75g/ft3.Upper layer is supported on by Rh by exporting in CeZr mixed oxides, the coating that the stabilized aluminium oxide of La forms.On
The carrier coating load capacity of layer is about 1.3g/in3, wherein Rh load capacity is 5g/ft3.Total carrier coating load capacity of catalyst 4
(middle area) is about 3.0g/in3。
Using standard application program, by the final base pastes containing Pd from the entrance of carrier identical with comparative catalyst 1
Face coats, and target coat depth is the 80% of carrier lengths, in 90 DEG C of dryings.It then, will be containing Rh's using standard application program
For upper slurry from the exit face coating of the carrier containing dry bottom, target coat depth is 80%, Zhi Hou of carrier lengths
90 DEG C of dryings are calcined 45 minutes at 500 DEG C.
Experimental result
Embodiment 1
Comparative catalyst 1 and catalyst 2-4 are carried out with four operating mode standard ageing cycle racks to 200 hours engine beds
Frame degradation, peak temperature are about 980 DEG C.In the enterprising driving discharge of the commercial vehicle with 1.4 liters of engines.It is being catalyzed
Discharge is measured before and after agent.
1 vehicle of table dilution bag adopts exhaust emissions result
As shown in table 1, catalyst 4 is even to be equivalent to about 80% lower total carrier coating in comparative catalyst 1
Load capacity shows comparable or even improved catalyst performance and (discharges relevant improvement for example, see with THC/NMHC
Performance from 0.047/0.031g/km to 0.042/0.026g/km, is improved respectively when catalyst 4 is compared with comparative catalyst 1
11% and 16%).
Embodiment 2
Comparative catalyst 1, catalyst 2 and catalyst 4 are coated with identical carrier type, hole mesh number and size,
Then in 200,300,400 and 600m3The air mass flow of/h evaluates their cold flow back pressure.
It is shown in table 2, catalyst 1, catalyst 2 and catalyst 4, the back pressure percentage relative to uncoated carrier increases.
Data point out that multi-region catalyst 4 has notable lower contribution compared with the standard double embodiment of catalyst 1, to back pressure.
2 catalyst cold flow back pressure test result of table
Claims (11)
1. the catalyst article for handling exhaust gas, it includes：
Including arrival end, outlet end and the carrier with axial length L；
Start from the arrival end and extend less than the catalyst at inlet layer of the axial length L, wherein the catalyst at inlet layer includes
Inlet palladium component；
Start from the outlet end and extend less than the outlet catalyst layer of the axial length L, wherein the outlet catalyst layer includes
Outlet rhodium component；With
Wherein the outlet catalyst layer is Chong Die with the catalyst at inlet layer.
2. catalyst article according to claim 1, wherein the catalyst at inlet layer extend the 50%- of the axial length L
99%.
3. catalyst article according to claim 1 or 2, wherein the outlet catalyst layer extend the axial length L
50%-99%.
4. catalyst article according to claim 1 or 2, wherein the outlet catalyst layer are Chong Die with the catalyst at inlet layer
The 5%-90% of the axial length L.
5. catalyst article according to claim 1 or 2, wherein the outlet catalyst layer are Chong Die with the catalyst at inlet layer
The 40%-80% of the axial length L.
6. catalyst article according to claim 1 or 2, wherein the catalyst at inlet layer are substantially free of the entrance palladium group
/ outer PGM metals.
7. catalyst article according to claim 1 or 2, the wherein carrier are flow type material all in one piece or wall-flow filter.
8. catalyst article according to claim 1 or 2, the wherein carrier lengths are less than 100mm.
9. catalyst article according to claim 1 or 2, wherein the catalyst at inlet layer directly load/are deposited on the load
On body.
10. catalyst article according to claim 1 or 2, wherein the outlet catalyst layer directly load/are deposited on the load
On body.
11. for the discharge treating system for the treatment of of combustion flue gas stream, it includes according to described in any one of claim 1-10
Catalyst article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721704812.XU CN208057201U (en) | 2017-12-08 | 2017-12-08 | Novel 3rd areas, two layers of TWC catalyst for gasoline exhaust gas application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721704812.XU CN208057201U (en) | 2017-12-08 | 2017-12-08 | Novel 3rd areas, two layers of TWC catalyst for gasoline exhaust gas application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019109998A1 (en) * | 2017-12-08 | 2019-06-13 | 庄信万丰(上海)化工有限公司 | Novel three-zone two-layer twc catalyst in gasoline waste gas applications |
-
2017
- 2017-12-08 CN CN201721704812.XU patent/CN208057201U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019109998A1 (en) * | 2017-12-08 | 2019-06-13 | 庄信万丰(上海)化工有限公司 | Novel three-zone two-layer twc catalyst in gasoline waste gas applications |
| US11110447B2 (en) | 2017-12-08 | 2021-09-07 | Johnson Matthey (shanghai) Chemicals Co., Ltd. | Three-zone two-layer TWC catalyst in gasoline waste gas applications |
| US11577234B2 (en) | 2017-12-08 | 2023-02-14 | Johnson Matthey (Shanghai) Chemicals Limited | Three-zone two-layer TWC catalyst in gasoline waste gas applications |
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