CN109261220A - A kind of preparation method and application of non-homogeneous coating tai-gas clean-up catalyst - Google Patents
A kind of preparation method and application of non-homogeneous coating tai-gas clean-up catalyst Download PDFInfo
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
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- 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
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
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Abstract
The invention discloses a kind of preparation method and applications of non-homogeneous coating tai-gas clean-up catalyst.Non-homogeneous coating tai-gas clean-up catalyst of the invention is that a kind of ignition performance and thermal stability are excellent, because the difference of position has different catalyst coatings.Catalyst realizes the combined application of the material with different catalysis on single-stage catalyst, pass through noble metal, the Sub-region and hierarchical of catalyst coatings material, the efficient application of proparea and back zone or internal layer and cladding material ingredient, the Multifunctional designs of the different realization catalyst matched and catalyst increases the flexibility that catalyst is designed in coating formula, noble metal distribution, coating structure.
Description
Technical field
The present invention relates to a kind of cleaning catalyst for tail gases of automobiles, can effectively eliminate in vehicle exhaust more particularly to a kind of
The preparation method and application of the non-homogeneous coating catalyst of CO, NMHC and NOx.
Background technique
As the reinforcement of environmental consciousness and the day of tail-gas law are increasingly tight, vehicle emission control technology is welcome new
Challenge, three-way catalyst is the major measure that can effectively eliminate CO, NOx, HC in tail-gas from gasoline automobiles generally acknowledged at present, works as temperature
When more than 250 DEG C, transformation efficiency can be up to 99% or more.In the application of catalyst, it is primarily present the double loads of single-stage, twin-stage and single-stage
Three kinds of layout type, and it is most commonly seen with first two.Single-stage and the front stage catalyst (CCC) of twin-stage are in design in order to be conducive to
Ignition usually has that carrier mesh number is high, the high feature of bullion content, and the rear stage catalyst (UFC) of twin-stage is in order to reduce into
This generally has carrier mesh number low, the low feature of bullion content.In recent years, due to prevailing, the single-stage catalyst of automobile with small output volume
It is widely used, such catalyst is close from engine, and performance is easy quickly to reduce in use.By many years to oxidation
Aluminium, cerium zirconium material, noble-metal-supported technological improvement are promoted, and present catalyst has in terms of catalytic performance and thermal stability
Biggish promotion.
For single-stage catalyst, subregion and the important method that layering is that coating structure designs, noble metal subregion can reduce expensive
The usage amount of metal and the initiation temperature of catalyst, layering can improve the endurance quality of catalyst, the usual proparea of noble metal subregion
Bullion content is high, and back zone content is low；Hierarchical design is usually that bottom is Pd, and upper layer is Rh or bottom is Pd, upper layer Pd,
Rh (101203301 A of CN102405104A, CN102325591A, CN101820997A, CN).Subregion and layering are more at present
Application be confined to noble metal, for example the reduction activation of Rh is high, but when being closely supported with Pd, there are the feelings of activity reduction
Condition, therefore can be layered using catalyst, Pd and Rh is loaded separated from each other.In order to promote the performance of catalyst, researcher
Have begun the subregion of coating material and layering studied, but rare report at present.8,557 204 B2 of US is disclosed
A kind of proparea single layer, the three-way catalyst of back zone bilayer, section length is preferably the 25~50% of overall length before the catalyst, and back zone is urged
Agent length is preferably the 50~75% of overall length, and proparea only has Pd layers, and back zone is internal layer Pd, outer layer Rh or Pt/Rh, and bottom
Front and back area coating material is different.The Sub-region and hierarchical of coating material can be according to area's material before and after carrying out the characteristics of vehicle in practical application
Material or layer materials are freely arranged in pairs or groups, and can give full play to the advantage of different materials, therefore the present invention provides a kind of non-homogeneous painting
Cover catalyst and preparation method thereof, it is therefore intended that improve the performance of catalyst to meet and constantly add tight regulation and reduction catalyst
Noble metal dosage.
Summary of the invention
The object of the present invention is to provide one kind to have excellent performance, the non-homogeneous painting that because of the difference of position there is different coating to constitute
The preparation method of the catalyst of layer distribution and its application in exhaust emissions.
Particularly, catalyst of the invention is that single-stage partitioned organization, wherein proparea and back zone include at least one layer, preferably
Bilayer such as coats the number of plies more than two layers, then increases production process, reduce production capacity.Proparea coating coated length is the 15 of overall length
~60%, preferably 20~50%, rear section length is 40~85%, preferably the 50~80% of overall length.
The catalyst proparea active oxidation aluminium content is high, 60~100wt% of alumina content, back zone cerium zirconium hydrogen-storing material
Content is high, 40~70wt% of cerium zirconium content.
The catalyst adjusts the coating thickness of coating by coating load amount and slurry viscosity, when catalyst is single layer
When structure, 120~250g/L of catalyst loadings, front and back area load capacity can be identical, can not also be identical；When catalyst is double
When layer structure, the catalyst inner layer load capacity 60~200g/L, 60~200g/L of outer layer, if the load capacity of internal layer or outer layer is low
When the range, the loading concentrations of catalyst noble metal increase, the growth of noble metal when be easy to causeing high temperature, activity drop
Low, if the load capacity of outer layer is higher than the range, the diffusivity that will cause gas is reduced, and cannot play the catalytic action of internal layer.
The catalyst proparea is single or double layer structure, containing precious metals pd or Rh, when catalyst proparea is single layer,
Precious metals pd, Rh can contain only Pd in one layer or the layer simultaneously, and preferably Pd, Rh is existed simultaneously；When catalyst proparea is double
When layer structure, precious metals pd is in internal layer, and Rh is in outer layer or part Pd and Rh in outer layer, and Pd, Rh are simultaneously in outer layer, the content of Pd
It is 1.0~5.0 times of Rh, preferably 1.0-2.0 times.
The catalyst proparea mainly contains activated alumina and a small amount of CeZr hydrogen-storing material.When proparea is single layer structure,
Alumina content is 60~100% in coating, preferably 60~75%, CeZr hydrogen-storing material 0~40%, preferably 20~40%, when
When proparea is double-layer structure, internal layer coating active oxidation aluminium content is 60~100%, preferably 75~100%, CeZr hydrogen-storing material
0~25%, preferably 0~10%, more preferable 0~5%；Outer coating active oxidation aluminium content be 25~70%, preferably 40~
60%, CeZr hydrogen-storing material 30~75%, preferably 40~60%.
Catalyst proparea activated alumina, preferably La-Al2O3、Ba-Al2O3、Ce-Al2O3、 Zr-Al2O3In one
Kind is several.La2O3、BaO、CeO2、ZrO2Content 1~15%, preferably 3~10%.
Catalyst proparea activated alumina can have different Phase stractures, γ, θ, δ, η, preferably γ and θ.
The CeZr hydrogen-storing material, the preferably quaternary of one or more doping containing La, Y, Pr, Nd or five yuan of oxides.
ZrO2To CeO2Mass ratio be 0.6~3.0, preferably 1.0~2.0, other rare earth total contents 1~15%, preferably 3~10%.It urges
At least contain a kind of CeZr composite oxides in agent, several difference ZrO can also be contained2:CeO2The CeZr composite oxides of mass ratio.
There are also a kind of oxides selected from rare earth element, alkaline-earth metal and triels in the catalyst, preferably
Y2O3、Nd2O3、Pr6O11、La2O3、BaO、SrO、ZrO2One or more of.
The catalyst back zone is single or double layer or three-decker, preferably double-layer structure, when catalyst back zone is single layer
When, Rh is at least contained in the coating, other noble metals, such as Pd can also be contained；Precious metals pd, Rh can be simultaneously at one layers；Work as catalysis
When agent back zone is double-layer structure, precious metals pd is in internal layer, and Rh is in outer layer or part Pd and Rh in outer layer, and preferably Pd, Rh are in difference
Layer.
The catalyst back zone mainly contains activated alumina and CeZr hydrogen-storing material.When back zone is single layer structure, coating
Middle alumina content is 20~60%, preferably 30~60%, CeZr hydrogen-storing material 40~80%, preferably 40~70%；Work as back zone
When for double-layer structure, internal layer coating active oxidation aluminium content is 30~70%, preferably 30~60%, CeZr hydrogen-storing material 30~
70%, preferably 40~70%；Outer coating active oxidation aluminium content is 25~50%, CeZr hydrogen-storing material 50~75%.
Particularly, the catalyst back zone is also possible to the adsorbent material containing HC, such as ZSM-5, the difference such as beta-molecular sieve Si/
Al is than the molecular sieve with structure.The molecular sieve can be coated on the internal layer of three layers of catalyst, can be the interior of double-layer catalyst
Layer, is also possible to the carrier of noble metal in single-layer catalyst.
Catalyst back zone activated alumina, preferably La-Al2O3、Ba-Al2O3、Ce-Al2O3One or more of,.
La2O3、BaO、CeO2Content 1~15%, preferably 3~10%.
The catalyst back zone CeZr hydrogen-storing material, the preferably quaternary or five of one or more doping containing La, Y, Pr, Nd
First oxide.ZrO2To CeO2Mass ratio be 0.6~3.0, preferably 1.0~2.0, other rare earth total contents 1~15%, preferably 3
~10%.At least contain a kind of CeZr composite oxides in catalyst, several difference ZrO can also be contained2:CeO2The CeZr of mass ratio is multiple
Close oxide.
Oxygen in the catalyst back zone also containing one or more selected from rare earth element, alkaline-earth metal and triels
Compound, preferably Y2O3、Nd2O3、Pr6O11、La2O3、BaO、SrO、ZrO2One or more of.
Particularly, when catalyst of the present invention is single or double layer structure, single layer or internal layer proparea are with back zone with different
Coating proportion, outer layer can be identical coating, is also possible to different coatings.
As described above, catalyst of the invention has the advantages that
1, catalyst of the invention has more excellent low temperature active, has preferably transformation efficiency to CO, HC and NOx,
There is excellent performance especially for the elimination of cold start-up HC compound, therefore as a kind of three-way catalyst, it is effective.
2, catalyst of the invention realizes the combined application of the material with different catalysis on single-stage catalyst, can
To realize the efficient application of catalyst according to the actual discharge situation of different engines targetedly Combination Design catalyst, increase
The flexibility for having added catalyst to design in coating formula, noble metal distribution, coating structure.
3, catalyst of the invention controls the thickness of catalyst ectonexine by load capacity, is conducive to play the excellent of each layer
Gesture, while inhibiting the reunion of high temperature noble metal.
Detailed description of the invention
Fig. 1 (a) is that conventional catalyst coats design diagram；Fig. 1 (b) is that the non-homogeneous coating of catalyst of the present invention designs
Schematic diagram.
Fig. 2 is the embodiment of the present invention and comparative example aging catalyst initiation temperature comparison diagram, catalyst information: sizeMesh number 600/4.3, volume 1.26L, 60@0:55:5 of proparea noble metal, 10@0:5:5 of back zone noble metal.
Fig. 3 be the embodiment of the present invention and the lower three kinds of pollutants of comparative example aging catalyst difference λ transformation efficiency comparison (1:
CO, 2:THC, 3:NOx), catalyst information: sizeMesh number 600/4.3, volume 1.26L, the expensive gold in proparea
Belong to 60@0:55:5,10@0:5:5 of back zone noble metal.
Specific embodiment
The present invention will be illustrated by following embodiment and comparative example, but the invention is not limited to following embodiments.
Embodiment is only illustrated the principle of the present invention and its effect, without departing from disclosed technology in all category technical fields
All equivalent modifications completed under thought or change should be covered as contained by claim of the invention.
Embodiment 1
The preparation of proparea internal layer catalyst coatings:
By the La-Al of predetermined amount2O3It is dispersed in water, stirs the BaSO of addition predetermined amount after 15min4, stir 15min, drop
Palladium nitrate is added, control pH value is not less than 5.0, after stirring 1h, grinds the mixture to required partial size, adjust slurry solid content and
Slurry is coated to honeycomb ceramic carrier using vacuum pumping device, is then dried by viscosity, completes proparea internal layer catalyst coatings
Preparation.Resulting catalyst coat includes following coated weights: 120g/L activated alumina；8g/L BaSO4；1.94g/L Pd；
Coated length is the 1/2 of carrier.
The preparation of back zone internal layer catalyst coatings:
By the La-Al of predetermined amount2O3It is dispersed in water with CeZr composite oxides, predetermined amount is added after stirring 15min
BaSO4, 15min is stirred, palladium nitrate is added dropwise to, control pH value is not less than 5.0, after stirring 1h, grinds the mixture to required grain
Diameter is adjusted slurry solid content and viscosity, coats to honeycomb ceramic carrier slurry using vacuum pumping device, then dry,
500 DEG C of calcining 4h complete the preparation of internal layer catalyst coatings.Resulting back zone catalyst coat includes following coated weights: 60g/L is living
Property aluminium oxide；60g/L CeZr composite oxides；8g/L BaSO4；0.177g/L Pd.Coated length is the 1/2 of carrier.
The preparation in proparea and back zone outer layer catalyst coatings:
The CeZr compound of predetermined amount is dispersed in water, BaSO is added4, lanthana, plus La-Al2O3, after being sufficiently stirred,
It is added dropwise to rhodium nitrate, control pH value is not less than 6.0, after Rh is sufficiently adsorbed, after stirring 1h, grinds the mixture, adjusts slurry
Solid content and viscosity are coated slurry to being completed on the carrier of internal layer preparation using vacuum pumping device, then drying, 500
DEG C calcining 4h obtain catalyst.Resulting catalyst outer layer includes following coated weights: 60g/L CeZr mixture；40g/L activity
Aluminium oxide； 8g/L BaSO4；0.177g/L Rh.
Comparative example 1
The preparation in proparea and back zone internal layer catalyst coatings:
By the La-Al of predetermined amount2O3It is dispersed in water with CeZr composite oxides, predetermined amount is added after stirring 15min
BaSO4, 15min is stirred, palladium nitrate is added dropwise to, control pH value is not less than 5.0, after stirring 1h, grinds the mixture to required grain
Diameter is adjusted slurry solid content and viscosity, coats to honeycomb ceramic carrier slurry using vacuum pumping device, then dry,
500 DEG C of calcining 4h complete the preparation of internal layer catalyst coatings.Resulting back zone catalyst coat includes following coated weights: 60g/L is living
Property aluminium oxide: 60g/L CeZr composite oxides；8g/L BaSO4；Proparea 1.94g/L Pd, back zone 0.177g/L Pd.Front and back
Area respectively accounts for the 1/2 of carrier lengths.
The preparation in proparea and back zone outer layer catalyst coatings: same to embodiment
Evaluating catalyst
The test that catalyst performance is carried out to the method that the catalyst of embodiment and comparative example uses tail gas simulation distribution, is urged
Agent is tested after carrying out 160h aging using GMAC875 operating condition on engine pedestal, and test object THC, CO, NOx's rises
Fire the transformation efficiency of temperature T50 (i.e. pollutant transformation efficiency reaches 50% corresponding temperature) and the lower three kinds of pollutants of different λ.From
The result of Fig. 2~Fig. 3 illustrates, non-homogeneous coating catalyst conventional catalyst of the invention has lower initiation temperature and wider
Air-fuel ratio window, therefore as three-way catalyst, it is effective.
Claims (10)
1. a kind of non-homogeneous coating tai-gas clean-up catalyst, it is characterised in that: catalyst has different catalysis because of the difference of position
Coating is constituted, and is that single-stage partitioned organization, wherein proparea and back zone include at least one layer, preferably double-deck, proparea coating coating length
Degree is the 15~60%, preferably 20~50% of overall length, and rear section length is 40~85%, preferably the 50~80% of overall length.
2. catalyst according to claim 1, it is characterised in that: active oxidation aluminium content in proparea is high, alumina content 60
~100wt%, back zone cerium zirconium hydrogen-storing material content is high, 40~70wt% of cerium zirconium content.
3. catalyst according to claim 1, it is characterised in that: when catalyst is single layer structure, catalyst loadings
120~250g/L, front and back area load capacity can be identical, can not also be identical；When catalyst is double-layer structure, the catalyst
Internal layer 60~200g/L of load capacity, 60~200g/L of outer layer.
4. catalyst according to claim 1, it is characterised in that: the catalyst proparea is single or double layer structure, is contained
There are precious metals pd or Rh, when catalyst proparea is single layer, precious metals pd, Rh can be contained only in one layer or the layer simultaneously
Pd, preferably Pd, Rh are existed simultaneously；When catalyst proparea is double-layer structure, precious metals pd is in internal layer, and Rh is in outer layer or part Pd
And Rh is in outer layer, and simultaneously in outer layer, the content of Pd is 1.0~5.0 times of Rh by Pd, Rh, preferably 1.0-2.0 times.
5. catalyst according to claim 1, it is characterised in that: the catalyst back zone is single or double layer or three-layered node
Structure, preferably double-layer structure at least contain Rh in the coating, can also contain other noble metals, such as when catalyst back zone is single layer
Pd；Precious metals pd, Rh can be simultaneously at one layers；When catalyst back zone is double-layer structure, precious metals pd is in internal layer, and Rh is in outer layer
Or part Pd and Rh, in outer layer, preferably Pd, Rh are in different layers.
6. catalyst according to claim 1, it is characterised in that: the catalyst proparea mainly contains activated alumina and lacks
CeZr hydrogen-storing material is measured, when proparea is single layer structure, alumina content is 60~100%, preferably 60~75% in coating,
CeZr hydrogen-storing material 0~40%, preferably 20~40%, when proparea is double-layer structure, internal layer coating active oxidation aluminium content is
60~100%, preferably 75~100%, CeZr hydrogen-storing material 0~25%, preferably 0~10%, more preferable 0~5%；Outer coating
Active oxidation aluminium content is 25~70%, preferably 40~60%, CeZr hydrogen-storing material 30~75%, preferably 40~60%.
7. catalyst according to claim 1, it is characterised in that: the catalyst back zone mainly contain activated alumina and
CeZr hydrogen-storing material.When back zone is single layer structure, alumina content is 20~60% in coating, preferably 30~60%, CeZr
Hydrogen-storing material 40~80%, preferably 40~70%；When back zone be double-layer structure when, internal layer coating active oxidation aluminium content be 30~
70%, preferably 30~60%, CeZr hydrogen-storing material 30~70%, preferably 40~70%；Outer coating active oxidation aluminium content is
25~50%, CeZr hydrogen-storing material 50~75%.
8. catalyst according to claim 6 or 7, it is characterised in that: the activated alumina, preferably La-Al2O3、Ba-
Al2O3、Ce-Al2O3、Zr-Al2O3One or more of.La2O3、BaO、CeO2、ZrO2Content 1~15%, preferably 3~
10%,
The activated alumina, can have different Phase stractures, γ, θ, δ, η, preferably γ and θ,
The CeZr hydrogen-storing material, the preferably quaternary of one or more doping containing La, Y, Pr, Nd or five yuan of oxides,
ZrO2To CeO2Mass ratio be 0.6~3.0, preferably 1.0~2.0, other rare earth total contents 1~15%, preferably 3~
10%.At least contain a kind of CeZr composite oxides in catalyst, several difference ZrO can also be contained2:CeO2The CeZr of mass ratio is compound
Oxide,
There are also a kind of oxide selected from rare earth element, alkaline-earth metal and triels, preferably Y in the catalyst2O3、
Nd2O3、Pr6O11、La2O3、BaO、SrO、ZrO2One or more of, when the catalyst is single or double layer structure, single layer
Or internal layer proparea from back zone there are different coatings to match, outer layer can be identical coating, be also possible to different coatings.
9. a kind of preparation method of non-homogeneous coating tai-gas clean-up catalyst, it is characterised in that contain following processing step:
1) preparation of proparea internal layer catalyst coatings:
By the La-Al of predetermined amount2O3It is dispersed in water, stirs the BaSO of addition predetermined amount after 15min4, 15min is stirred, is added dropwise to
Palladium nitrate controls pH value and is not less than 5.0, after stirring 1h, grinds the mixture to required partial size, adjusts slurry solid content and glue
Degree, slurry is coated to honeycomb ceramic carrier, then dry using vacuum pumping device, completes proparea internal layer catalyst coatings
Preparation.Resulting catalyst coat includes following coated weights: 120g/L activated alumina；8g/L BaSO4；1.94g/L Pd；It applies
Cover 1/2 that length is carrier；
2) preparation of back zone internal layer catalyst coatings:
By the La-Al of predetermined amount2O3It is dispersed in water with CeZr composite oxides, stirs the BaSO of addition predetermined amount after 15min4,
15min is stirred, palladium nitrate is added dropwise to, control pH value is not less than 5.0, after stirring 1h, grinds the mixture to required partial size, adjustment
Slurry is coated to honeycomb ceramic carrier using vacuum pumping device, is then dried by slurry solid content and viscosity, and 500 DEG C are forged
Burn the preparation that 4h completes internal layer catalyst coatings.Resulting back zone catalyst coat includes following coated weights: 60g/L active oxidation
Aluminium；60g/L CeZr composite oxides；8g/L BaSO4；0.177g/L Pd.Coated length is the 1/2 of carrier；
3) preparation in proparea and back zone outer layer catalyst coatings:
The CeZr compound of predetermined amount is dispersed in water, BaSO is added4, lanthana, plus La-Al2O3, after being sufficiently stirred, it is added dropwise
Enter rhodium nitrate, control pH value is not less than 6.0, after Rh is sufficiently adsorbed, after stirring 1h, grinds the mixture, adjustment slurry contains admittedly
Amount and viscosity, using vacuum pumping device by slurry coat to be completed internal layer preparation carrier on, then drying, 500 DEG C forge
It burns 4h and obtains catalyst.Resulting catalyst outer layer includes following coated weights: 60g/L CeZr mixture；40g/L active oxidation
Aluminium；8g/L BaSO4；0.177g/L Rh.
10. elimination or cold start-up HC chemical combination that catalyst described in claim 1 is applied to CO, NMHC and NOx in vehicle exhaust
The elimination of object.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108223079A (en) * | 2016-12-14 | 2018-06-29 | 福特环球技术公司 | The improvement of the coating of flow optimized or the relevant improvement of coating with flow optimized |
| CN110075836A (en) * | 2019-05-29 | 2019-08-02 | 上海歌地催化剂有限公司 | Lean-burn NOx trap catalyst |
| CN110801833A (en) * | 2019-10-24 | 2020-02-18 | 浙江达峰汽车技术有限公司 | Localized coating of automobile exhaust purification catalyst and preparation method thereof |
| CN110801832A (en) * | 2019-10-22 | 2020-02-18 | 浙江达峰汽车技术有限公司 | Gasoline engine tail gas purification three-effect catalyst meeting national emission standard |
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| CN111530283A (en) * | 2020-04-13 | 2020-08-14 | 江门市大长江集团有限公司 | Catalyst and preparation method and application thereof |
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| CN111841534A (en) * | 2019-04-25 | 2020-10-30 | 丰田自动车株式会社 | Catalyst for exhaust gas purification |
| CN110075836A (en) * | 2019-05-29 | 2019-08-02 | 上海歌地催化剂有限公司 | Lean-burn NOx trap catalyst |
| CN110801832A (en) * | 2019-10-22 | 2020-02-18 | 浙江达峰汽车技术有限公司 | Gasoline engine tail gas purification three-effect catalyst meeting national emission standard |
| CN110801833A (en) * | 2019-10-24 | 2020-02-18 | 浙江达峰汽车技术有限公司 | Localized coating of automobile exhaust purification catalyst and preparation method thereof |
| CN110801833B (en) * | 2019-10-24 | 2022-11-11 | 浙江达峰汽车技术有限公司 | Localized coating of automobile exhaust purification catalyst and preparation method thereof |
| CN111111698A (en) * | 2020-01-15 | 2020-05-08 | 盐城师范学院 | Preparation method of in-situ synthesized ZnO supported Ag photocatalyst |
| CN111530283A (en) * | 2020-04-13 | 2020-08-14 | 江门市大长江集团有限公司 | Catalyst and preparation method and application thereof |
| CN111530283B (en) * | 2020-04-13 | 2022-06-07 | 江门市大长江集团有限公司 | Catalyst, preparation method and application thereof |
| CN112577751A (en) * | 2020-12-14 | 2021-03-30 | 东风汽车集团有限公司 | Model selection method of automobile exhaust three-way catalyst |
| CN112577751B (en) * | 2020-12-14 | 2022-03-15 | 东风汽车集团有限公司 | Model selection method of automobile exhaust three-way catalyst |
| CN115634687A (en) * | 2021-07-19 | 2023-01-24 | 上海歌地催化剂有限公司 | Three-way catalyst for trapping NOx in tail gas of lean-burn gasoline engine or diesel engine |
| CN116116430A (en) * | 2022-08-04 | 2023-05-16 | 中钢集团天澄环保科技股份有限公司 | Catalyst for purifying carbon monoxide and nitrogen oxides simultaneously and preparation method and application thereof |
| CN118002195A (en) * | 2024-04-09 | 2024-05-10 | 昆明贵研催化剂有限责任公司 | Coupling type three-way catalyst for diesel engine and preparation method thereof |
| CN118002195B (en) * | 2024-04-09 | 2024-06-11 | 昆明贵研催化剂有限责任公司 | Coupling type three-way catalyst for diesel engine and preparation method thereof |
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