CN107790124A - Three-component Catalytic Converters for Automobiles - Google Patents
Three-component Catalytic Converters for Automobiles Download PDFInfo
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- CN107790124A CN107790124A CN201610778980.7A CN201610778980A CN107790124A CN 107790124 A CN107790124 A CN 107790124A CN 201610778980 A CN201610778980 A CN 201610778980A CN 107790124 A CN107790124 A CN 107790124A
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 39
- 239000003054 catalyst Substances 0.000 claims abstract description 58
- 238000012986 modification Methods 0.000 claims abstract description 27
- 230000004048 modification Effects 0.000 claims abstract description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 22
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 22
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 claims abstract description 21
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002808 molecular sieve Substances 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 15
- 210000003850 cellular structure Anatomy 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- 229910001868 water Inorganic materials 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 239000003795 chemical substances by application Substances 0.000 abstract description 9
- 229910000510 noble metal Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 230000003213 activating effect Effects 0.000 abstract description 3
- 230000032683 aging Effects 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 239000010970 precious metal Substances 0.000 abstract description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 37
- 239000010948 rhodium Substances 0.000 description 34
- 239000002002 slurry Substances 0.000 description 14
- 239000003643 water by type Substances 0.000 description 7
- 229910052703 rhodium Inorganic materials 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910052763 palladium Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 206010013786 Dry skin Diseases 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 206010001497 Agitation Diseases 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013028 emission testing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/46—Ruthenium, rhodium, osmium or iridium
- B01J23/464—Rhodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—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
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/74—Noble metals
- B01J29/7415—Zeolite Beta
-
- 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
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/396—Distribution of the active metal ingredient
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0205—Impregnation in several steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0207—Pretreatment of the support
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Toxicology (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of Three-component Catalytic Converters for Automobiles, including cellular structure ceramic carrier and coated in supported catalyst, it is characterized in that the three-way catalytic converter has double-decker, internal layer is Pd layer catalyst converters, outer layer is coated in the Rh Catalytic Layers on Pd layer catalyst converters, the Pd layers catalyst converter includes cellular structure ceramic carrier and coated in the Pd Catalytic Layers composition on carrier, and the Pd coatings are by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and precious metals pd be mixed with；The Rh coatings are by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and noble metal Rh be mixed with.Three-way catalytic converter of the present invention uses bi-layer coating structure, the high-temperature aging resisting ability of catalyst converter can be lifted, reduce the probability for making activating agent fail because forming alloy between noble metal, Rh layers in extexine are advantageous to NOx Preferential adsorption conversion, NOx transformation efficiency is improved, reduces NOx emission.
Description
Technical field
The invention belongs to vehicle maintenance service field, more particularly to a kind of Three-component Catalytic Converters for Automobiles.
Background technology
Contain many harmful substances in vehicle exhaust, it is main to include hydrocarbon and oxynitrides, reduce car tail
The discharge of harmful substance in gas, it is the important topic that the mankind must solve.At present, the most effective approach of automobile exhaust pollution is controlled
It is that wherein harmful components will be converted into innocuous gas using reforming unit, converter the most frequently used at present is three-way conversion device.Three
First converter, be mounted in most important outer purifier in automobile exhaust system, can by vehicle exhaust discharge CO, HC and
The pernicious gases such as NOx are changed into harmless carbon dioxide, water and nitrogen by oxidation and reduction, enable vehicle exhaust net
Change.
The catalyst coat of automobile catalytic device generally by with high-specific surface area complex rare-earth oxidate containing valuable metal material (such as γ-
Al2O3And CeO2Deng) 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.Current three-way catalyst generally all uses Pd-Rh noble metals as active component, by Pd and cerium zirconium
Composite oxides, Modification on Al2O3Pd slurries are mixed to get, by Rh and cerium zirconium compound oxide, Modification on Al2O3It is mixed to get Rh slurries
Material, is mixed to form catalyst pulp by Pd slurries and Rh slurry agitations, coated on ceramic honeycomb carrier, drying and roasting, obtains
Automobile three-way catalysts.
But existing vehicle NOx ratio is relatively difficult to convert, discharge capacity is high, and current ternary catalyzing unit effectively can not turn for NOx
Change, NOx conversion efficiency is low, it is impossible to meets the motor vehicle emission high standard of national regulation requirement.
The content of the invention
The present invention is in order to solve the defects of above-mentioned prior art is present and deficiency, there is provided a kind of automobile three way catalytic conversion
Device, the coating structure of Three-component Catalytic Converters for Automobiles of the present invention can lift the high-temperature aging resisting ability of catalyst converter, reduce because expensive
The probability for forming alloy between metal and making activating agent fail, and be advantageous to NOx Preferential adsorption conversion, improve NOx conversion
Efficiency, reduce NOx emission.
An object of the present invention there is provided a kind of new automobile three-way catalytic converter, including cellular structure ceramic carrier
With coated in supported catalyst, it is characterised in that the three-way catalytic converter has a double-decker, and internal layer is that Pd layers are urged
Change device, outer layer is to include cellular structure ceramic carrier and painting coated in the Rh Catalytic Layers on Pd layer catalyst converters, the Pd layers catalyst converter
The Pd Catalytic Layers composition overlayed on carrier.
Preferably, the coated weight of Pd catalyst is 100g/L~150g/L on the cellular structure ceramic carrier.
Preferably, the coated weight of the outer layer Rh Catalytic Layers is 80g/L~120g/L, and the Rh layers of outer layer are advantageous to NOx's
Preferential adsorption converts, and improves NOx transformation efficiency, reduces NOx emission.
The second object of the present invention is to provide the preparation method of above-mentioned Three-component Catalytic Converters for Automobiles, the preparation method bag
Include following steps：
1) by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and deionized water mixing, add Pd, stir 1~5h；Add
Enter adhesive, continue to stir 0.5h~3h, Pd catalyst pulps are formed after adding water for ball milling regulation solid content；
2) by the Pd catalyst pulps in step 1) coated on cellular structure ceramic carrier, in 120 DEG C of dry 3~10h,
500 DEG C~600 DEG C are calcined 1~5 hour, obtain Pd layer catalyst；
3) by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and deionized water mixing, add Rh, stir 1~5h；Add
Enter adhesive, continue to stir 0.5h~3h, Rh catalyst pulps are formed after adding water for ball milling regulation solid content；
4) by the Rh catalyst pulps in step 3) be coated in step 2) in Pd layer catalyst converters on, 120 DEG C dry 3~
10h, it is calcined 1~5 hour at 500 DEG C~600 DEG C, obtains Pd-Rh automobile three-way catalysts.
Preferably, the cerium zirconium compound oxide described in step 1), Modification on Al2O3, molecular sieve part by weight be 1:3:
0.1~3:1:1.
Preferably, the adhesive described in step 1) is that described adhesive accounts for the 1~5% of Pd catalyst pulp weight
Preferably, the cerium zirconium compound oxide described in step 2), Modification on Al2O3, molecular sieve part by weight be 1:3:
0.1~3:1:1.
Preferably, step 1), the Modification on Al described in step 3)2O3For the γ-Al of alkali modification processing2O3, at alkalescence
γ-the Al of reason2O3The duct of carrier is increased, increases the load capacity of Pd, Rh active catalytic components, improves Pd, Rh active catalytic group
The dispersiveness and stability divided.
Preferably, step 1), the molecular sieve described in step 3) are Beta molecular sieves, increase Pd, Rh active catalytic components
Load capacity, prevent from forming alloy between Pd, Rh, influence the catalytic activity of catalyst.
Compared with prior art, the beneficial effects of the present invention are：The Three-component Catalytic Converters for Automobiles of the present invention uses Pd-
Rh bi-layer coating structures, by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and precious metals pd, Rh catalyst be mixed with painting
Layer material, the high-temperature aging resisting ability of catalyst converter can be lifted, reduce makes activating agent fail because forming alloy between noble metal
Probability, the Rh layers in extexine are advantageous to NOx Preferential adsorption conversion, improve NOx transformation efficiency, reduce NOx emission
Amount.
Embodiment
The embodiment of the present invention is described further below.Herein it should be noted that for these implementations
The explanation of mode is used to help understand the present invention, but does not form limitation of the invention.In addition, invention described below
As long as involved technical characteristic does not form conflict can and is mutually combined each other in each embodiment.
Embodiment 1
Three-component Catalytic Converters for Automobiles is prepared with the following method：
1) by 57g cerium zirconium compound oxides, 57g Modification on Al2O3, 29g Beta molecular sieves and 120g deionized waters mixing, add
Enter 2.2963g Pd, stir 3h；Adhesive is added, continues to stir 1h, adds water for ball milling 10min, formation Pd is urged after adjusting solid content
Agent slurry；
2) the Pd catalyst pulps in step 1) are coated on cellular structure ceramic carrier by 100g/L, in 120 DEG C of dryings
5h, it is calcined 3 hours at 500 DEG C DEG C, obtains Pd layer catalyst；
3) by 45.6g cerium zirconium compound oxides, 45.6g Modification on Al2O3, 29g Beta molecular sieves and 100g deionized waters mix
Close, add 0.1209g Rh, stir 3h；Adhesive is added, continues to stir 1h, Rh catalysis is formed after adding water for ball milling regulation solid content
Agent slurry；
4) the Rh catalyst pulps in step 3) are coated on the Pd layer catalyst converters in step 2) by 80g/L, at 120 DEG C
5h is dried, is calcined 3 hours at 500 DEG C, obtains Pd-Rh automobile three-way catalysts.
Embodiment 2
Three-component Catalytic Converters for Automobiles is prepared with the following method：
1) by 54.8g cerium zirconium compound oxides, 82.1g Modification on Al2O3, 5.5g Beta molecular sieves and 150g deionized waters mix
Close, add 2.2963gPd, stir 5h；Adhesive is added, continues to stir 0.5h, formation Pd is urged after adding water for ball milling regulation solid content
Agent slurry；
2) the Pd catalyst pulps in step 1) are coated on cellular structure ceramic carrier by 120g/L, in 120 DEG C of dryings
10h, it is calcined 5 hours at 600 DEG C, obtains Pd layer catalyst；
3) by 85.6g cerium zirconium compound oxides, 28.5g Modification on Al2O3, 28.5g Beta molecular sieves and 120g deionized waters
Mixing, 0.1209g Rh are added, stir 1h；Adhesive is added, continues to stir 3h, formation Rh is urged after adding water for ball milling regulation solid content
Agent slurry；
4) the Rh catalyst pulps in step 3) are coated on the Pd layer catalyst converters in step 2) by 100g/L, 120
DEG C dry 10h, 600 DEG C be calcined 1 hour, obtain Pd-Rh automobile three-way catalysts.
Embodiment 3
Three-component Catalytic Converters for Automobiles is prepared with the following method：
1) by 28.5g cerium zirconium compound oxides, 85.5g Modification on Al2O3, 28.5g Beta molecular sieves and 120g deionized waters
Mixing, 2.2963g Pd are added, stir 3h；Adhesive is added, continues to stir 3h, formation Pd is urged after adding water for ball milling regulation solid content
Agent slurry；
2) the Pd catalyst pulps in step 1) are coated on cellular structure ceramic carrier by 150g/L, in 120 DEG C of dryings
10h, it is calcined 1 hour at 600 DEG C, obtains Pd layer catalyst；
3) by 28.5g cerium zirconium compound oxides, 85.6g Modification on Al2O3, 28.5g Beta molecular sieves and 120g deionized waters
Mixing, 0.1209g Rh are added, stir 1h；Adhesive is added, continues to stir 3h, formation Rh is urged after adding water for ball milling regulation solid content
Agent slurry；
4) the Rh catalyst pulps in step 3) are coated on the Pd layer catalyst converters in step 2) by 120g/L, 120
DEG C dry 3h, 600 DEG C be calcined 5 hours, obtain Pd-Rh automobile three-way catalysts.
Comparative example
Three-component Catalytic Converters for Automobiles is prepared with the following method：
1) by 57g cerium zirconium compound oxides, 57g Modification on Al2O3Mixed with 120g deionized waters, add 2.2963gPd, stir
3h is mixed, obtains Pd slurries；
2) by 45.6g cerium zirconium compound oxides, 45.6g Modification on Al2O3Mix, add with 100g appropriate amount of deionized water
0.1209gRh, 3h is stirred, obtains Rh slurries；
3) Pd slurries and Rh slurries are mixed, stirs 2h, add adhesive, continued to stir 1h, add water for ball milling 10min, adjust
Catalyst pulp is formed after section solid content, coated weight is coated on ceramic honeycomb carrier by 180g/L, 120 DEG C of dry 6h, 500 DEG C
3h is calcined, obtains automobile three-way catalysts.
Experiment effect
As described in Table 1, the emission testing of state five of different automobile three-way catalysts on the rolling stock is determined, with comparative example
Compare, the ternary catalyzing unit disclosed in the embodiment of the present invention 1~3 can effectively reduce the discharge of harmful substance in vehicle exhaust
Amount, the wherein NOx conversion efficiency of the present embodiment ternary catalyzing unit have higher NOx conversion efficiency, dropped apparently higher than comparative example
Low NOx drainage amount.
1 different automobile three-way catalysts of the table emission result of state five on the rolling stock
| THC, g/km | CO, g/km | NOx, g/km | NMHC, g/km | |
| Discharge standard | 0.1 | 1 | 0.06 | 0.068 |
| Embodiment 1 | 0.042 | 0.472 | 0.026 | 0.037 |
| Embodiment 2 | 0.037 | 0.359 | 0.023 | 0.032 |
| Embodiment 3 | 0.026 | 0.312 | 0.018 | 0.028 |
| Comparative example | 0.051 | 0.571 | 0.037 | 0.046 |
The embodiment of invention is explained in detail above, but the invention is not restricted to described embodiment.For
For those skilled in the art, in the case where not departing from the principle of the invention and spirit, these embodiments are carried out a variety of
Change, modification, replacement and modification, still fall within protection scope of the present invention.
Claims (10)
1. a kind of Three-component Catalytic Converters for Automobiles, including cellular structure ceramic carrier and coated in supported catalyst, its feature
It is that the three-way catalytic converter has double-decker, internal layer is Pd layer catalyst converters, and outer layer is coated on Pd layer catalyst converters
Rh Catalytic Layers, the Pd layers catalyst converter include cellular structure ceramic carrier and coated on carrier Pd Catalytic Layers composition.
2. Three-component Catalytic Converters for Automobiles according to claim 1, it is characterised in that：Pd on the cellular structure ceramic carrier
The coated weight of catalyst is 100g/L~150g/L.
3. Three-component Catalytic Converters for Automobiles according to claim 1, it is characterised in that：The coating of the outer layer Rh Catalytic Layers
Measure as 80g/L~120g/L.
A kind of 4. preparation method of the Three-component Catalytic Converters for Automobiles described in claim 1-3, it is characterised in that：Including following step
Suddenly：
1) by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and deionized water mixing, add Pd, stir 1~5h；Add viscous
Mixture, continue to stir 0.5h~3h, Pd catalyst pulps are formed after adding water for ball milling regulation solid content；
2) by the Pd catalyst pulps in step 1) coated on cellular structure ceramic carrier, in 120 DEG C of dry 3~10h, 500
DEG C~600 DEG C be calcined 1~5 hour, obtain Pd layer catalyst；
3) by cerium zirconium compound oxide, Modification on Al2O3, molecular sieve and deionized water mixing, add Rh, stir 1~5h；Add viscous
Mixture, continue to stir 0.5h~3h, Rh catalyst pulps are formed after adding water for ball milling regulation solid content；
4) the Rh catalyst pulps in step 3) are coated on the Pd layer catalyst converters in step 2), in 120 DEG C of dry 3~10h,
It is calcined 1~5 hour at 500 DEG C~600 DEG C, obtains Pd-Rh automobile three-way catalysts.
5. the preparation method of new automobile three-way catalytic converter according to claim 4, it is characterised in that：In step 1)
Described cerium zirconium compound oxide, Modification on Al2O3, molecular sieve part by weight be 1:3:0.1~3:1:1.
6. it is characterized in that：Adhesive described in step 1) accounts for the 1~5% of Pd catalyst pulp weight.
7. the preparation method of Three-component Catalytic Converters for Automobiles according to claim 4, it is characterised in that：Described in step 3)
Cerium zirconium compound oxide, Modification on Al2O3, molecular sieve part by weight be 1:3:0.1~3:1:1.
8. the preparation method of Three-component Catalytic Converters for Automobiles according to claim 4, it is characterised in that：Described in step 3)
Adhesive account for the 1~5% of Rh catalyst pulp weight.
9. the preparation method of Three-component Catalytic Converters for Automobiles according to claim 4, it is characterised in that：Step 1), step
3) Modification on Al described in2O3For the γ-Al of alkali modification processing2O3。
10. the preparation method of Three-component Catalytic Converters for Automobiles according to claim 4, it is characterised in that：Step 1), step
3) molecular sieve described in is Beta molecular sieves.
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