CN106944047A - A kind of four coatings three-way catalyst and preparation method thereof - Google Patents
A kind of four coatings three-way catalyst and preparation method thereof Download PDFInfo
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- CN106944047A CN106944047A CN201710129031.0A CN201710129031A CN106944047A CN 106944047 A CN106944047 A CN 106944047A CN 201710129031 A CN201710129031 A CN 201710129031A CN 106944047 A CN106944047 A CN 106944047A
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- 238000000576 coating method Methods 0.000 title claims abstract description 228
- 239000003054 catalyst Substances 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 35
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 211
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 96
- 229910052593 corundum Inorganic materials 0.000 claims description 96
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 96
- 239000002131 composite material Substances 0.000 claims description 92
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 48
- 239000006255 coating slurry Substances 0.000 claims description 40
- 239000011248 coating agent Substances 0.000 claims description 36
- 239000002002 slurry Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000000498 ball milling Methods 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 19
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 19
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 229910002637 Pr6O11 Inorganic materials 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 239000010970 precious metal Substances 0.000 claims description 14
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 13
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 11
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 11
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 11
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- 230000001413 cellular effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000011068 loading method Methods 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 229910052573 porcelain Inorganic materials 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 abstract description 2
- 239000010948 rhodium Substances 0.000 description 145
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 51
- 241000264877 Hippospongia communis Species 0.000 description 30
- 229910000510 noble metal Inorganic materials 0.000 description 17
- 239000000919 ceramic Substances 0.000 description 16
- 210000003850 cellular structure Anatomy 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 241000256844 Apis mellifera Species 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- 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
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- 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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of four coatings three-way catalyst and preparation method thereof, including honeycomb substrate, Pd coatings are provided with the upper surface of honeycomb substrate inlet end, the first Rh coatings are provided with the upper surface of Pd coatings, the 2nd Rh coatings are provided with the upper surface of outlet side, the 3rd Rh coatings are provided with the upper surface of the 2nd Rh coatings；And the coated weight of Pd coatings is 50 ~ 220g/L, the coated weight of the first Rh coatings is 30 ~ 180g/L, and the coated weight of the 2nd Rh coatings is 50 ~ 220g/L, and the coated weight of the 3rd Rh coatings is 30 ~ 180g/L.Preparation method of the present invention is simple to operation, the three-way catalyst prepared uses sectional design, inlet end includes Pd coatings and Rh coatings, and outlet side is two Rh coatings, three-way catalyst is still possessed very high anti-air-fuel ratio fluctuation ability and high-speed operating mode NOx conversion ability after weathering.
Description
Technical field
The invention discloses a kind of four coatings three-way catalyst, the invention also discloses a kind of four coatings three-element catalytic
The preparation method of agent.
Background technology
The major pollutants of vehicle exhaust are carbon monoxide (CO), hydrocarbon (HC) and oxynitrides (NOx).With
The fast development of auto industry, the hydrocarbon and oxynitrides of China's motor vehicle emission in 2015 in millions of tons,
The discharge capacity of carbon monoxide is up to tens million of tons, and motor vehicle exhaust emission turns into the main source of big and medium-sized cities air pollution.Peace
Three-way catalyst in gasoline vehicle exhaust system can be by carbon monoxide, oxidizing hydrocarbon into carbon dioxide (CO2)
With water (H2O), oxynitrides and is made to be reduced to nitrogen (N simultaneously2), so as to realize the synchronization of three kinds of major pollutants in tail gas
Purification.The three-way catalyst is generally made up of two parts：Cellular ceramics or metallic carrier, and it is attached to urging on carrier
Agent coating.Catalyst coat is generally by the inorganic oxide material (such as γ-Al with large specific surface area2O3With containing CeO2's
Cerium zirconium sosoloid etc.) and to be supported on the noble metal active component of oxide surface (be often Pt (platinum), in Pd (palladium), Rh (rhodium)
It is one or more of) composition.
From China by having made laws since controlling motor vehicle exhaust emission, European NEDC test loops are continued to use always to test automobile
Exhaust emissions.However, in vehicle traveling process, the anxious situation for accelerating and suddenly slowing down is very universal, and highway driving
During ultrahigh speed (130km/h) phenomenon also often occur, these actual conditions can cause especially severe exhaust emissions.In order to
More effectively control motor vehicle exhaust emission, China is " stage of state six " will use WLTC test loops.With it is more stable
NEDC circulations are compared, and WLTC test loops are substantially transient condition, and F-Zero is in more than 130km/h, NOx when serious
Discharge capacity may improve more than 50%.In addition, the exhaust temperature before catalyst reaches as high as more than 800 DEG C, catalyst it is anti-
Aging Capability Requirement is higher.The anti-fluctuation ability of traditional PdRh two-layer three-way catalysts is weaker, and superelevation air speed is (when referring to unit
In flow through the ratio between the mixed gas volume and catalyst of catalyst volume itself) operating mode when conversion rate of NOx be also not high enough to,
" the requirement of the discharge standard of state six " can not be effectively met.Compared with Pd, there is Rh noble metals more excellent NOx catalysis to live
Property, and Novel oxygen storage materials there has also been very big development, therefore carry out high Rh types three-way catalyst for solving to locate after automobile
Reason technical barrier tool is of great significance.
The content of the invention
An object of the present invention be overcome the deficiencies in the prior art there is provided a kind of anti-tail gas fluctuation ability it is strong and
The sufficiently high four coatings three-way catalyst of superelevation air speed operating mode conversion rate of NOx.
It is a further object of the present invention to provide the preparation method of a kind of four times coating three-way catalysts.
The technical scheme provided according to the present invention, four coatings three-way catalyst, including honeycomb substrate, honeycomb substrate
One end be inlet end, the other end of honeycomb substrate is outlet side, Pd coatings is provided with the upper surface of inlet end, in Pd coatings
Upper surface is provided with the first Rh coatings, is provided with the 2nd Rh coatings in the upper surface of outlet side, is provided with the upper surface of the 2nd Rh coatings
3rd Rh coatings；And the coated weight of Pd coatings is 50~220g/L, the coated weight of the first Rh coatings is 30~180g/L, the 2nd Rh
The coated weight of coating is 50~220g/L, and the coated weight of the 3rd Rh coatings is 30~180g/L；2nd Rh coatings and the 3rd
The Rh loaded in Rh coatings mass ratio is 1:15~10:1, the Rh loaded in the first Rh coatings and the 3rd Rh coatings matter
Amount is than being 1:15~10:1；
The Pd coatings include load Pd La2O3-Al2O3With the first zirconia composite oxide, La2O3-Al2O3With
The mass ratio of one zirconia composite oxide is 1:20~10:1；
The first Rh coatings include load Rh the second zirconia composite oxide and La2O3-Al2O3, the second zirconium oxide
Composite oxides and La2O3-Al2O3Mass ratio be 1:6~20:1；
The 2nd Rh coatings are load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh
The second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide
And La2O3-Al2O3Mass ratio be 1:6~20:1；
The 3rd Rh coatings are load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh
The second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide
And La2O3-Al2O3Mass ratio be 1:6~20:1.
As preferred：By weight percentage containing 20%~70% in first zirconia composite oxide
CeO2, 20%~70% ZrO2With 5%~15% La2O3、Y2O3、Pr6O11、Nd2O3In one or more.
As preferred：By weight percentage containing 65%~95% ZrO in second zirconia composite oxide2
With 5%~35% CeO2、La2O3、Y2O3、Pr6O11、Nd2O3In one or more.
As preferred：The La2O3-Al2O3In by weight percentage containing 1%~8% La2O3With 92%~99%
Al2O3。
The material of the honeycomb substrate is ceramics or metal.
A kind of preparation method of four coatings three-way catalyst comprises the following steps：
By Pd precious metal solutions, La2O3-Al2O3, the first zirconia composite oxide and deionized water mixing, after ball milling
It is configured to coating slurry；Slurries are coated on the inlet end of honeycomb substrate for 50~220g/L by coated weight, after coating
Honeycomb substrate dries 0.2~24h at a temperature of 80~150 DEG C so that Pd coatings are formed on the inlet end of honeycomb substrate；
By Rh precious metal solutions, the first zirconia composite oxide or the second zirconia composite oxide, La2O3-Al2O3
With deionized water mixing, and coating slurry is configured to after ball milling；It is that slurries are coated to honeycomb by 50~220g/L by coated weight
On the outlet side of carrier, the honeycomb substrate after coating is dried into 0.2~24h at a temperature of 80~150 DEG C, then by the honeybee of drying
Nest carrier is in 350~650 DEG C of 1~5h of roasting temperature so that the 2nd Rh coatings are formed on the outlet side of honeycomb substrate；
By Rh precious metal solutions, the second zirconia composite oxide, La2O3-Al2O3Mixed with deionized water, and through ball milling
After be configured to coating slurry；Slurries are coated on Pd coatings for 30~180g/L by coated weight, by the honeycomb substrate after coating
0.2~24h is dried at a temperature of 80~150 DEG C so that the first Rh coatings are formed on Pd coatings；
By Rh precious metal solutions, the first zirconia composite oxide or the second zirconia composite oxide, La2O3-Al2O3
With deionized water mixing, and coating slurry is configured to after ball milling；It is that slurries are coated to second by 30~180g/L by coated weight
On Rh coatings, the honeycomb substrate after coating is dried into 0.2~24h at a temperature of 80~150 DEG C, then by the honeycomb substrate of drying
In 350~650 DEG C of 1~5h of roasting temperature so that form the 3rd Rh coatings on the 2nd Rh coatings.
As preferred：The Pd coatings include load Pd La2O3-Al2O3With the first zirconia composite oxide, La2O3-
Al2O3Mass ratio with the first zirconia composite oxide is 1:20~10:1；
The first Rh coatings include load Rh the second zirconia composite oxide and La2O3-Al2O3, the second zirconium oxide
Composite oxides and La2O3-Al2O3Mass ratio be 1:6~20:1；
The 2nd Rh coatings are load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh
The second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide
And La2O3-Al2O3Mass ratio be 1:6~20:1；
The 3rd Rh coatings are load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh
The second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide
And La2O3-Al2O3Mass ratio be 1:6~20:1.
As preferred：By weight percentage containing 20%~70% in first zirconia composite oxide
CeO2, 20%~70% ZrO2With 5%~15% La2O3、Y2O3、Pr6O11、Nd2O3In one or more.
As preferred：By weight percentage containing 65%~95% ZrO in second zirconia composite oxide2
With 5%~35% CeO2、La2O3、Y2O3、Pr6O11、Nd2O3In one or more.
As preferred：The La2O3-Al2O3In by weight percentage containing 1%~8% La2O3With 92%~99%
Al2O3。
Preparation method of the present invention is simple to operation, and the three-way catalyst prepared uses sectional design, and inlet end includes
Pd coatings and Rh coatings, outlet side are two Rh coatings, three-way catalyst is still possessed very high anti-air-fuel ratio ripple after weathering
Kinetic force and high-speed operating mode NOx conversion ability.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
With reference to specific embodiment, the invention will be further described.
Embodiment 1
A kind of four coatings three-way catalyst, including honeycomb substrate 1, specification is Ф 118.4mm × 152.4mm, hole density
For 600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb substrate 1 enters outgoing direction one end for inlet end by gas,
The other end is outlet side, and the length ratio of inlet end and outlet side is 1:1, the Rh of Pd coatings 2 and the first paintings are attached with inlet end
The coated weight of layer 3, Pd coatings is 180g/L, and Pd content is 100g/ft3；The coated weight of first Rh coatings is 140g/L, Rh's
Content is 4g/ft3, the 2nd Rh coatings 4 of attachment and the 3rd Rh coatings 5 on outlet side, the coated weight of the 2nd Rh coatings 4 is 180g/
L, Rh content are 7g/ft3；The coated weight of 3rd Rh coatings 5 is 140g/L, and Rh content is 7g/ft3。
The preparation method of four coatings three-way catalyst, using following processing step：
The coating procedure of Pd coatings 2：By the zirconia composite oxides of 1000g first, 1000gLa2O3-Al2O3With go in right amount
Ionized water is mixed, and coating slurry is obtained after ball milling, then the palladium nitrate solution containing 39.24g precious metals pds is added into slurries
In, coating slurry is coated on the inlet end of cellular structure ceramic carrier for 180g/L by coated weight.Wherein, the first zirconium oxide is answered
Close the CeO that percentage in oxide contains 50%2, 40% ZrO2, 5% La2O3With 5% Pr6O11, La2O3
The middle percentage of stable aluminum oxide contains 5% La2O3With 95% Al2O3。
The coating procedure of 2nd Rh coatings 4：By the zirconia composite oxides of 1000g second, 1000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 2.75g noble metals Rh is added to slurry
It is the outlet side that the coating slurry is coated to cellular structure ceramic carrier by 180g/L by coated weight in liquid；By the catalysis after coating
5h is dried in agent at a temperature of 120 DEG C, then by the catalyst of drying in 500 DEG C of roasting temperature 3h.Wherein, the second zirconium oxide is answered
Close the CeO that percentage in oxide contains 10%2, 85% ZrO2With 5% La2O3, La2O3-Al2O3In by weight
Amount percentage meter contains 5% La2O3With 95% Al2O3。
The coating procedure of first Rh coatings 3：By the zirconia composite oxides of 1000g second, 1000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 2.02g noble metals Rh is added to slurry
It is the inlet end that the coating slurry is coated to the cellular structure ceramic carrier for being coated with Pd coatings 2 by 140g/L by coated weight in liquid
On.Wherein, percentage contains 10 %CeO in the second zirconia composite oxide2, 85% ZrO2With 5%
La2O3, La2O3-Al2O3Middle percentage contains 5% La2O3With 95% Al2O3。
The coating procedure of 3rd Rh coatings 5：By the zirconia composite oxides of 1000g first, 1000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 3.53g noble metals Rh is added to slurry
It is that the coating slurry is coated to and to be coated with the cellular structure ceramic carriers of the 2nd Rh coatings 4 and go out by 140g/L by coated weight in liquid
On gas end；Catalyst after coating is dried into 5h at a temperature of 120 DEG C, then roasted the catalyst of drying at a temperature of 500 DEG C
Burn 3h.Wherein, percentage contains 50 %CeO in the first zirconia composite oxide2, 40 %ZrO2, 5%
La2O3With 5% Pr6O11, La2O3-Al2O3Middle percentage contains 5% La2O3With 95% Al2O3。
Embodiment 2
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:1, Pd coatings and the first Rh coatings are attached with inlet end,
The coated weight of Pd coatings is 180g/L, and Pd content is 100g/ft3；The coated weight of first Rh coatings is 140g/L, Rh content
For 4g/ft3, the 2nd Rh coatings of attachment and the 3rd Rh coatings on outlet side, the coated weight of the 2nd Rh coatings is 180g/L, and Rh's contains
Measure as 7g/ft3；The coated weight of 3rd Rh coatings is 140g/L, and Rh content is 7g/ft3。
The preparation of the catalyst exemplar of embodiment 2：Each parameter, composition and preparation process are same as Example 1, except outlet side
The 2nd Rh coatings 3 in the second zirconia composite oxide be changed to the first zirconia composite oxide, constitute as 50%
CeO2, 40% ZrO2, 5% La2O3, 5% Pr6O11；The first zirconia composite oxide in 3rd Rh coatings 5 is changed into
Second zirconia composite oxide, the CeO of composition 10%2, 85% ZrO2With 5% La2O3。
Embodiment 3
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:1, the Rh coatings of Pd coatings 2 and the first are attached with inlet end
The coated weight of 3, Pd coatings 2 is 180g/L, and Pd content is 100g/ft3；The coated weight of first Rh coatings 3 is 140g/L, Rh's
Content is 8g/ft3, the 2nd Rh coatings 4 of attachment and the 3rd Rh coatings 5 on outlet side, the coated weight of the 2nd Rh coatings 4 is 180g/
L, Rh content are 2g/ft3；The coated weight of 3rd Rh coatings 5 is 140g/L, and Rh content is 8g/ft3。
The preparation of the catalyst exemplar of embodiment 3：Each parameter, composition and preparation process are same as Example 2, except outlet side
The 2nd Rh coating slurries in noble metal Rh addition be changed into expensive in 0.79g, the first Rh coatings 3 and the slurries of the 3rd Rh coatings 5
Metal Rh addition is changed into 4.04g.
Embodiment 4
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:1, the Rh coatings of Pd coatings 2 and the first are attached with inlet end
The coated weight of 3, Pd coatings 2 is 180g/L, and Pd content is 100g/ft3；The coated weight of first Rh coatings 3 is 140g/L, Rh's
Content is 4g/ft3, the 2nd Rh coatings 4 of attachment and the 3rd Rh coatings 5 on outlet side, the coated weight of the 2nd Rh coatings 4 is 180g/
L, Rh content are 12g/ft3；The coated weight of 3rd Rh coatings 5 is 140g/L, and Rh content is 2g/ft3。
The preparation of the catalyst exemplar of embodiment 4：Each parameter, composition and preparation process are same as Example 2, except outlet side
Noble metal Rh addition is changed into noble metal Rh in 4.71g, the slurries of the 3rd Rh coatings of outlet side 5 in the slurries of 2nd Rh coatings 4
Addition is changed into 1.01g.
Embodiment 5
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:5, the Rh coatings of Pd coatings 2 and the first are attached with inlet end
The coated weight of 3, Pd coatings 2 is 180g/L, and Pd content is 300g/ft3；The coated weight of first Rh coatings 3 is 140g/L, Rh's
Content is 4g/ft3, the 2nd Rh coatings 4 of attachment and the 3rd Rh coatings 5 on outlet side, the coated weight of the 2nd Rh coatings 4 is 180g/
L, Rh content are 6g/ft3；The coated weight of 3rd Rh coatings 5 is 140g/L, and Rh content is 4g/ft3。
The preparation of the catalyst exemplar of embodiment 5：Each parameter, composition and preparation process are same as Example 2, except inlet end
In the slurries of Pd coatings 2 addition of precious metals pd be changed into noble metal Rh's in 117.72g, the slurries of the 2nd Rh coatings of outlet side 4 plus
Enter quantitative change for 2.36g, noble metal Rh addition is changed into 2.02g in the slurries of the 3rd Rh coatings of outlet side 5.
Embodiment 6
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:1, the Rh coatings of Pd coatings 2 and the first are attached with inlet end
The coated weight of 3, Pd coatings 2 is 220g/L, and Pd content is 100g/ft3；The coated weight of first Rh coatings 3 is 30g/L, Rh's
Content is 4g/ft3, the 2nd Rh coatings 4 of attachment and the 3rd Rh coatings 5 on outlet side, the coated weight of the 2nd Rh coatings 4 is 220g/
L, Rh content are 7g/ft3；The coated weight of 3rd Rh coatings 5 is 30g/L, and Rh content is 7g/ft3。
The preparation method of four coating three-way catalysts, comprises the following steps：
The coating procedure of Pd coatings 2：By the zirconia composite oxides of 1000g first, 6000g La2O3-Al2O3With go in right amount
Ionized water is mixed, and coating slurry is obtained after ball milling, then the palladium nitrate solution containing 112.37g precious metals pds is added into slurries
In, coating slurry is coated on the inlet end of cellular structure ceramic carrier for 220g/L by coated weight.Wherein, the first zirconium oxide is answered
Close the CeO that percentage in oxide contains 50%2, 40% ZrO2, 5% La2O3With 5% Pr6O11, La2O3
The middle percentage of stable aluminum oxide contains 5% La2O3With 95% Al2O3；
The coating procedure of 2nd Rh coatings 4：By the zirconia composite oxides of 1000g first, 6000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 7.87g noble metals Rh is added to slurry
It is the outlet side that the coating slurry is coated to cellular structure ceramic carrier by 220g/L by coated weight in liquid；By the catalysis after coating
5h is dried in agent at a temperature of 120 DEG C, then by the catalyst of drying in 500 DEG C of roasting temperature 3h.Wherein, the first zirconium oxide is answered
Close the CeO that percentage in oxide contains 50%2, 40% ZrO2, 5% La2O3With 5% Pr6O11, La2O3
The middle percentage of stable aluminum oxide contains 5% La2O3With 95% Al2O3；
The coating procedure of first Rh coatings 3：By the zirconia composite oxides of 2000g second, 100gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 9.89g noble metals Rh is added to slurry
It is the inlet end that the coating slurry is coated to the cellular structure ceramic carrier for being coated with Pd coatings 2 by 30g/L by coated weight in liquid
On.Wherein, percentage contains 10% CeO in the second zirconia composite oxide2, 85% ZrO2With 5%
La2O3, La2O3-Al2O3Middle percentage contains 5% La2O3With 95% Al2O3；
The coating procedure of 3rd Rh coatings 5：By the zirconia composite oxides of 2000g second, 100gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 4.94g noble metals Rh is added to slurry
It is the outlet that the coating slurry is coated to the cellular structure ceramic carrier for being coated with the 2nd Rh coatings 4 by 30g/L by coated weight in liquid
On end；Catalyst after coating is dried into 5h at a temperature of 120 DEG C, then by the catalyst of drying in 500 DEG C of roasting temperatures
3h.Wherein, percentage contains 10% CeO in the second zirconia composite oxide2, 85% ZrO2With 5%
La2O3, La2O3-Al2O3Middle percentage contains 5% La2O3With 95% Al2O3。
Embodiment 7
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:1, the Rh coatings of Pd coatings 2 and the first are attached with inlet end
The coated weight of 3, Pd coatings 2 is 50g/L, and Pd content is 100g/ft3；The coated weight of first Rh coatings 3 is 180g/L, Rh's
Content is 4g/ft3, the 2nd Rh coatings 4 of attachment and the 3rd Rh coatings 5 on outlet side, the coated weight of the 2nd Rh coatings 4 is 50g/L,
Rh content is 7g/ft3；The coated weight of 3rd Rh coatings 5 is 180g/L, and Rh content is 7g/ft3。
The preparation method of four coating three-way catalysts, comprises the following steps：
The coating procedure of Pd coatings 2：By the zirconia composite oxides of 2000g first, 100g La2O3-Al2O3With it is appropriate go from
Sub- water mixing, obtains coating slurry, then the palladium nitrate solution containing 148.33g precious metals pds is added into slurries after ball milling
In, coating slurry is coated on the inlet end of cellular structure ceramic carrier for 50g/L by coated weight.Wherein, the first zirconium oxide is answered
Close percentage in oxide and contain CeO250wt%, ZrO240wt%, La2O35wt%, Pr6O115wt%,
La2O3The middle percentage of stable aluminum oxide contains 5% La2O3With 95% Al2O3；
The coating procedure of 2nd Rh coatings 4：By the zirconia composite oxides of 2000g first, 100gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 10.38g noble metals Rh is added to
It is the outlet side that the coating slurry is coated to cellular structure ceramic carrier by 50g/L by coated weight in slurries；By the catalysis after coating
5h is dried in agent at a temperature of 120 DEG C, then by the catalyst of drying in 500 DEG C of roasting temperature 3h.Wherein, the first zirconium oxide is answered
Close percentage in oxide and contain CeO250wt%, ZrO240wt%, La2O35wt%, Pr6O115wt%,
La2O3The percentage of the aluminum oxide of middle stabilization contains 5% La2O3With 95% Al2O3；
The coating procedure of first Rh coatings 3：By the zirconia composite oxides of 1000g second, 6000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 5.49g noble metals Rh is added to slurry
It is the inlet end that the coating slurry is coated to the cellular structure ceramic carrier for being coated with Pd coatings by 180g/L by coated weight in liquid
On.Wherein, percentage contains CeO in the second zirconia composite oxide210wt%, ZrO285wt%, La2O3
5wt%, La2O3-Al2O3Middle percentage contains 5% La2O3With 95% Al2O3；
The coating procedure of 3rd Rh coatings 5：By the zirconia composite oxides of 1000g second, 6000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the rhodium nitrate solution containing 9.61g noble metals Rh is added to slurry
It is the outlet that the coating slurry is coated to the cellular structure ceramic carrier for being coated with the 2nd Rh coatings by 180g/L by coated weight in liquid
On end；Catalyst after coating is dried into 5h at a temperature of 120 DEG C, then by the catalyst of drying in 500 DEG C of roasting temperatures
3h.Wherein, percentage contains 10% CeO in the second zirconia composite oxide2, 85%ZrO2、La2O3-Al2O3
Middle percentage contains 5% La2O3With 95% Al2O3。
Comparative example
A kind of four coatings three-way catalyst, including honeycomb substrate, specification is Ф 118.4mm × 152.4mm, and hole density is
600cpsi, duct wall thickness is 4.3mil, and volume is 1.678L；Honeycomb support enters outgoing direction one end for inlet end by gas, separately
One end is outlet side, and the length ratio of inlet end and outlet side is 1:1, the first Pd coatings are adhered on inlet end, coated weight is 180g/
L, Pd content are 100g/ft3；Adhere to the 2nd Pd coatings on outlet side, coated weight is 180g/L, and Pd content is 10g/ft3；
Rh coatings are attached with respectively on first Pd coatings of inlet end and the 2nd Pd coatings of outlet side, and coated weight is 140g/L, Rh
Content be 4g/ft3。
The preparation method of four coatings three-way catalyst, using following processing step：
The coating procedure of first Pd coatings 3：By the zirconia composite oxides of 1000g first, 1000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the palladium nitrate solution containing 39.24g precious metals pds is added to
In slurries, the coating slurry is coated on the inlet end of cellular structure ceramic carrier for 140g/L by coated weight；Wherein, the first oxygen
Change the CeO that percentage in zirconium mixed oxide contains 50%2, 40% ZrO2, 5% La2O3With 5%
Pr6O11, La2O3-Al2O3Middle percentage contains 5% La2O3With 95% Al2O3；
The coating procedure of 2nd Pd coatings 4：By the zirconia composite oxides of 1000g first, 1000gLa2O3-Al2O3With it is suitable
Deionized water mixing is measured, coating slurry is obtained after ball milling, then the palladium nitrate solution containing 3.92g precious metals pds is added to slurry
It is then that the coating slurry is coated to outlet side by 180g/L by coated weight in liquid；By the catalyst after coating in 120 DEG C of temperature
Lower drying 5h, then by the catalyst of drying in 500 DEG C of roasting temperature 3h.Wherein, pressed in the first zirconia composite oxide
Percent by weight contains 50% CeO2, 40% ZrO2, 5%La2O3And 5%Pr6O11, La2O3-Al2O3In percentage by weight
Number meter contains 5% La2O3With 95% Al2O3；
The coating procedure of inlet end and outlet side Rh coatings：By the zirconia composite oxides of 1000g second, 1000g
La2O3-Al2O3With appropriate amount of deionized water mixing, coating slurry is obtained after ball milling, by the rhodium nitrate containing 2.02g noble metals Rh
Solution is added in slurries, is that the coating slurry is coated to and is coated with the ceramic honeycombs of Pd coatings by 140g/L by by coated weight
On the inlet end of carrier, then coating slurry is coated on outlet side for 140g/L by coated weight；By the catalyst after coating
5h is dried at a temperature of 120 DEG C, then by the catalyst of drying in 500 DEG C of roasting temperature 3h.Wherein, the second zirconium oxide is combined
Percentage contains 10% CeO in oxide2, 85% ZrO2With 5% La2O3, La2O3-Al2O3In by weight
Percentage meter contains 5% La2O3With 95% Al2O3。
By the catalyst sample obtained by 1~embodiment of embodiment 7 and comparative example in 1050 DEG C of high temperature Muffle furnace
Interior same condition aging 20h, is then encapsulated into clarifier, carries out vehicle emission test by WLTC circulations, tests the engine of vehicle
Discharge capacity is 1.6L, and emission test result is as shown in table 1.
Table 1
| Low speed | Middling speed+high speed | Ultrahigh speed | |
| NOx(g) | NOx(g) | NOx(g) | |
| Comparative example | 0.348 | 0.464 | 0.316 |
| Embodiment 1 | 0.337 | 0.437 | 0.251 |
| Embodiment 2 | 0.329 | 0.429 | 0.235 |
| Embodiment 3 | 0.323 | 0.408 | 0.208 |
| Embodiment 4 | 0.336 | 0.442 | 0.258 |
| Embodiment 5 | 0.343 | 0.455 | 0.278 |
| Embodiment 6 | 0.341 | 0.450 | 0.280 |
| Embodiment 7 | 0.342 | 0.451 | 0.283 |
As shown in table 1, catalyst vehicle emission test result shows, compared with comparative example, the institute of the embodiment of the present invention 1~7
The three-way catalyst of preparation is in transient condition (middling speed+high speed stage) and high-speed operating mode (ultrahigh speed stage) NOx detergent powers
Significantly increase.
Claims (10)
1. a kind of four coatings three-way catalyst, including honeycomb substrate（1）, honeycomb substrate（1）One end be inlet end, cellular set
Body（1）The other end be outlet side, the upper surface of inlet end be provided with Pd coatings（2）, in Pd coatings（2）Upper surface provided with the
One Rh coatings（3）, the 2nd Rh coatings are provided with the upper surface of outlet side（4）, in the 2nd Rh coatings（4）Upper surface be provided with the 3rd
Rh coatings（5）；And Pd coatings（2）Coated weight be 50 ~ 220g/L, the first Rh coatings（3）Coated weight be 30 ~ 180g/L, the
Two Rh coatings（4）Coated weight be 50 ~ 220g/L, the 3rd Rh coatings（5）Coated weight be 30 ~ 180g/L；2nd Rh is applied
Layer（4）With the 3rd Rh coatings（5）The Rh of middle load mass ratio is 1:15~10:1, the first Rh coatings（3）Applied with the 3rd Rh
Layer（5）The Rh of middle load mass ratio is 1:15~10:1；
The Pd coatings（2）La including loading Pd2O3-Al2O3With the first zirconia composite oxide, La2O3-Al2O3With first
The mass ratio of zirconia composite oxide is 1:20~10:1；
The first Rh coatings（3）The second zirconia composite oxide and La including loading Rh2O3-Al2O3, the second zirconium oxide answer
Close oxide and La2O3-Al2O3Mass ratio be 1:6~20:1；
The 2nd Rh coatings（4）To load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh's
Second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide and
La2O3-Al2O3Mass ratio be 1:6~20:1；
The 3rd Rh coatings（5）To load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh's
Second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide and
La2O3-Al2O3Mass ratio be 1:6~20:1.
2. four coatings three-way catalyst as claimed in claim 1, it is characterized in that：In first zirconia composite oxide
By weight percentage containing 20% ~ 70% CeO2, 20% ~ 70% ZrO2With 5% ~ 15% La2O3、Y2O3、Pr6O11、Nd2O3In
One or more.
3. four coatings three-way catalyst as claimed in claim 1, it is characterized in that：In second zirconia composite oxide
By weight percentage containing 65% ~ 95% ZrO2With 5% ~ 35% CeO2、La2O3、Y2O3、Pr6O11、Nd2O3In one kind or several
Kind.
4. four coatings three-way catalyst as claimed in claim 1, it is characterized in that：The La2O3-Al2O3In percentage by weight
Than counting containing 1% ~ 8% La2O3With 92% ~ 99% Al2O3。
5. four coatings three-way catalyst as claimed in claim 1, it is characterized in that：The honeycomb substrate（1）Material for pottery
Porcelain or metal.
6. a kind of preparation method of four coatings three-way catalyst, it is characterized in that this method comprises the following steps：
By Pd precious metal solutions, La2O3-Al2O3, the first zirconia composite oxide and deionized water mixing, after ball milling prepare
Into coating slurry；Slurries are coated on the inlet end of honeycomb substrate for 50 ~ 220g/L by coated weight, by the cellular set after coating
Body dries 0.2 ~ 24h at a temperature of 80 ~ 150 DEG C so that Pd coatings are formed on the inlet end of honeycomb substrate（2）；
By Rh precious metal solutions, the first zirconia composite oxide or the second zirconia composite oxide, La2O3-Al2O3With go from
The mixing of sub- water, and it is configured to after ball milling coating slurry；It is that slurries are coated to going out for honeycomb substrate by 50 ~ 220g/L by coated weight
On gas end, the honeycomb substrate after coating is dried into 0.2 ~ 24h at a temperature of 80 ~ 150 DEG C, then the honeycomb substrate of drying existed
350 ~ 650 DEG C of 1 ~ 5h of roasting temperature so that the 2nd Rh coatings are formed on the outlet side of honeycomb substrate（4）；
By Rh precious metal solutions, the second zirconia composite oxide, La2O3-Al2O3Mix, and match somebody with somebody after ball milling with deionized water
Coating slurry is made；It is that slurries are coated to Pd coatings by 30 ~ 180g/L by coated weight（2）On, the honeycomb substrate after coating is existed
0.2 ~ 24h is dried at a temperature of 80 ~ 150 DEG C so that in Pd coatings（2）The first Rh coatings of upper formation（3）；
By Rh precious metal solutions, the first zirconia composite oxide or the second zirconia composite oxide, La2O3-Al2O3With go from
The mixing of sub- water, and it is configured to after ball milling coating slurry；It is that slurries are coated to the 2nd Rh coatings by 30 ~ 180g/L by coated weight
（4）On, the honeycomb substrate after coating is dried into 0.2 ~ 24h at a temperature of 80 ~ 150 DEG C, then by the honeycomb substrate of drying 350
~ 650 DEG C of 1 ~ 5h of roasting temperature so that in the 2nd Rh coatings（4）The 3rd Rh coatings of upper formation（5）.
7. four coatings three-way catalyst as claimed in claim 6, it is characterized in that：The Pd coatings（2）Including load Pd's
La2O3-Al2O3With the first zirconia composite oxide, La2O3-Al2O3Mass ratio with the first zirconia composite oxide is 1:
20~10:1；
The first Rh coatings（3）The second zirconia composite oxide and La including loading Rh2O3-Al2O3, the second zirconium oxide answer
Close oxide and La2O3-Al2O3Mass ratio be 1:6~20:1；
The 2nd Rh coatings（4）To load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh's
Second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide and
La2O3-Al2O3Mass ratio be 1:6~20:1；
The 3rd Rh coatings（5）To load Rh the first zirconia composite oxide and La2O3-Al2O3Or be load Rh's
Second zirconia composite oxide and La2O3-Al2O3, the first zirconia composite oxide or the second zirconia composite oxide and
La2O3-Al2O3Mass ratio be 1:6~20:1.
8. four coatings three-way catalyst as claimed in claim 6, it is characterized in that：In first zirconia composite oxide
By weight percentage containing 20% ~ 70% CeO2, 20% ~ 70% ZrO2With 5% ~ 15% La2O3、Y2O3、Pr6O11、Nd2O3In
One or more.
9. four coatings three-way catalyst as claimed in claim 6, it is characterized in that：In second zirconia composite oxide
By weight percentage containing 65% ~ 95% ZrO2With 5% ~ 35% CeO2、La2O3、Y2O3、Pr6O11、Nd2O3In one kind or several
Kind.
10. four coatings three-way catalyst as claimed in claim 6, it is characterized in that：The La2O3-Al2O3In percentage by weight
Than counting containing 1% ~ 8% La2O3With 92% ~ 99% Al2O3。
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|---|---|---|---|---|
| CN107715875A (en) * | 2017-11-01 | 2018-02-23 | 台州欧信环保净化器有限公司 | A kind of GPF four-way catalysts and preparation method thereof |
| CN108126698A (en) * | 2018-01-05 | 2018-06-08 | 无锡威孚环保催化剂有限公司 | A kind of selective cleaning three-way catalyst and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597748A (en) * | 2015-11-13 | 2016-05-25 | 无锡威孚环保催化剂有限公司 | Segmented type ternary catalyst and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597748A (en) * | 2015-11-13 | 2016-05-25 | 无锡威孚环保催化剂有限公司 | Segmented type ternary catalyst and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107715875A (en) * | 2017-11-01 | 2018-02-23 | 台州欧信环保净化器有限公司 | A kind of GPF four-way catalysts and preparation method thereof |
| CN107715875B (en) * | 2017-11-01 | 2020-06-02 | 台州欧信环保净化器有限公司 | GPF quaternary catalyst and preparation method thereof |
| CN108126698A (en) * | 2018-01-05 | 2018-06-08 | 无锡威孚环保催化剂有限公司 | A kind of selective cleaning three-way catalyst and preparation method thereof |
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