CN107519857A - The processing technology of ternary catalyst for automobile tail gas - Google Patents
The processing technology of ternary catalyst for automobile tail gas Download PDFInfo
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- CN107519857A CN107519857A CN201710699132.1A CN201710699132A CN107519857A CN 107519857 A CN107519857 A CN 107519857A CN 201710699132 A CN201710699132 A CN 201710699132A CN 107519857 A CN107519857 A CN 107519857A
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- carrier
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- catalyst
- tail gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01J37/0215—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0221—Coating of particles
- B01J37/0223—Coating of particles by rotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0232—Coating by pulverisation
-
- 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
- B01J37/0234—Impregnation and coating simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
Abstract
The present invention relates to the processing technology in purifying vehicle exhaust field, specifically ternary catalyst for automobile tail gas, it is included zirconium oxide, cerium oxide and lanthanum powder mixing and ball milling by mass fraction into composite powder；Above-mentioned composite powder is configured to slurry with deionized water；Pretreated hollow column like catalyst carrier is immersed in above-mentioned slurry；After slurry is fully supported on carrier, mobile cylinder simultaneously drives carrier to remove slurry；Slurry unnecessary in carrier duct is thrown away by rotating the cylinder, and reclaims the slurry thrown away；Then carrier is immersed in palladium bichloride ammonia solution, then takes out and dry, be calcined, cooling down, obtain catalyst.The present invention refines catalyst fines particle by ball milling, and its crystallite dimension reaches nanoscale；Meanwhile using lanthanoid metal so that the activity of catalyst is improved；The present invention is also outwards thrown away the slurry in duct from carrier inside using centrifugal force, wind-force can be avoided to blow to the outer surface of carrier, so as to ensure the uniformity of carrier outer surface coating.
Description
Technical field
The present invention relates to the processing technology in purifying vehicle exhaust field, specifically ternary catalyst for automobile tail gas.
Background technology
Existing three-way catalyst is by cellular ceramics or metallic carrier and is attached to supported catalyst coating group
Into.Catalyst coat is generally by the oxide material with large specific surface area（Such as aluminum oxide）, hydrogen-storing material and be dispersed in oxygen
Compound or the noble metal active component on hydrogen-storing material surface（Often it is Pt（Platinum）、Pd（Palladium）、Rh（Rhodium）In one or more）Group
Into.Hydrogen-storing material therein is generally the composite oxides containing cerium zirconium, and it is by the oxygen in adsorption storage tail gas or discharges oxygen
To adjust the ratio of oxidizing component and reproducibility component in tail gas, it is oxidized carbon monoxide and hydrocarbon oxygen same
When, oxynitrides is reduced.Current three-way catalyst generally all using double coating structures, that is, is attached on honeycomb substrate
Lower coating loading Pd, and be attached to the upper coating on lower coating and support Rh, in order that catalyst has enough oxygen storage capacities,
Generally there are substantial amounts of hydrogen-storing material and a certain amount of aluminum oxide in Rh coatings.Rh catalysis is gone back after significantly improving high temperature ageing
The activity of former oxynitrides, but due to the deficiency of oxygen storage capacity, the pollutant emission of transient condition is still very high, especially
For changing very sensitive oxynitride discharge to tail gas air-fuel ratio, the clean-up effect of this catalyst is unsatisfactory.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of ternary catalyst for automobile tail gas for improving tail gas clean-up effect
Processing technology.
Technical scheme is used by the present invention solves above-mentioned technical problem：The processing work of ternary catalyst for automobile tail gas
Skill, it comprises the following steps：
（1）By mass fraction by zirconium oxide, cerium oxide and lanthanum powder mixing and ball milling, then add alumina powder and continue ball milling, obtain
Composite powder；
（2）Above-mentioned composite powder is configured to slurry with deionized water；
（3）Pretreated hollow column like catalyst carrier is set in outside cylinder, drives carrier to immerse in above-mentioned slurry by cylinder；
（4）After slurry is fully supported on carrier, mobile cylinder simultaneously drives carrier to remove slurry；
（5）Slurry unnecessary in carrier duct is thrown away by rotating the cylinder, and reclaims the slurry thrown away；
（6）Then carrier is immersed in palladium bichloride ammonia solution, then takes out and dry, be calcined, cooling down, obtain catalyst.
Preferably, in the composite powder, zirconium oxide accounts for 4-8wt%, and cerium oxide accounts for 15-20wt%, lanthanum accounts for 2-
4wt%, surplus are aluminum oxide.
Preferably, the mixing and ball milling time is 30-50h, continuation Ball-milling Time is 20-40h.
Preferably, ball milling uses 180-220r/min rotating speed, ratio of grinding media to material is（9—10）:1.
Preferably, the composite powder and deionized water are delivered in size barrel respectively is stirred mixing.
Preferably, the cylinder bottom is provided with the agitating paddle that mixing is stirred to slurry.
Preferably, it is provided with the support chip for supporting the carrier on the upside of the agitating paddle on the cylinder.
Preferably, it is provided with several pieces micro-blades, the carrier set on the upside of the support chip on the cylinder
Blade outboard is located at, is thrown away slurry unnecessary in carrier duct with wind-force caused by movable vane piece rotation by cylinder.
As can be known from the above technical solutions, the present invention refines catalyst fines particle by ball milling, and its crystallite dimension reaches
Nanoscale；Meanwhile using lanthanoid metal so that the activity of catalyst is improved；The present invention also using centrifugal force from carrier inside to
The outer slurry by duct is thrown away, and wind-force can be avoided to blow to the outer surface of carrier, so as to ensure the uniform of carrier outer surface coating
Property.
Embodiment
The present invention is described in detail below, illustrative examples of the invention and explanation are used for explaining the present invention herein, but
It is not as a limitation of the invention.
The processing technology of ternary catalyst for automobile tail gas, it comprises the following steps：
First by mass fraction by zirconium oxide, cerium oxide and lanthanum powder 30-50h of mixing and ball milling, when adding aluminum oxide and continuing ball milling
Between 20-40h, obtain composite powder, wherein zirconium oxide accounts for 4-8wt%, and cerium oxide accounts for 15-20wt%, and lanthanum accounts for 2-4wt%, surplus
For aluminum oxide；180-220r/min rotating speed is used in mechanical milling process,（9—10）:1 ratio of grinding media to material, it can so obtain nanometer
The composite powder of level.In mechanical milling process, because stress-induced isomer phase transformation can occur for aluminum oxide ball milling, generation
α-Al2O3 are unfavorable to catalytic performance, so should participate in grinding again after ball milling zirconium oxide, cerium oxide and lanthanum powder；And before lanthanum powder is answered
Phase is mixed together ball milling with zirconium oxide, cerium oxide, is otherwise difficult refinement.The present invention first avoid aluminum oxide and only ball milling zirconium oxide,
Cerium oxide and lanthanum powder to a certain extent, then add aluminum oxide and continue ball milling, zirconium oxide can be made to be dissolved into completely in cerium oxide, dropped
The lattice constant of suboxides cerium, while lanthanum highly dispersed can be made in the solid solution of cerium oxide-cerium oxide；Therefore, this ball milling work
Skill can not only obtain cerium oxide-oxidation cerium solid solution, and refine lanthanum powder, and whole composite powder particle diameter can reach 60-
90nm。
It is last to obtain nanometer grade composit powder, the composite powder material is configured to slurry with deionized water；The composite powder
Powder material and deionized water are delivered in size barrel respectively is stirred mixing, mixes material mixing, in implementation process, institute
State cylinder bottom and be provided with the agitating paddle that mixing is stirred to slurry, be advantageous to conveniently stir.At the same time, need to be to hollow
Column like catalyst carrier is pre-processed, and to facilitate load coating, then hollow column like catalyst carrier is set in outside cylinder, passes through cylinder band
Dynamic load body is immersed in above-mentioned slurry；The support chip that the present invention is arranged on the cylinder on the upside of the agitating paddle on the one hand can
Carrier is supported, on the other hand can prevent carrier from being contacted with agitating paddle, avoids the rotation of agitating paddle from damaging carrier.
After slurry is fully supported on carrier, mobile cylinder simultaneously drives carrier to remove slurry so that loads cated load
Body departs from size barrel, then throws away slurry unnecessary in carrier duct by rotating the cylinder；The present invention is in the cylinder
Upper to be provided with several pieces micro-blades on the upside of the support chip, the carrier is set in blade outboard, passes through cylinder band movable vane
Wind-force caused by piece rotation throws away slurry unnecessary in carrier duct, thereby guarantees that the coating uniform of carrier.In implementation process
In, the stop block for preventing carrier from rotating is provided with the support chip, carrier can be avoided to get rid of the coating on its surface because of rotation
Fall.After slurry unnecessary in duct is thrown away, because carrier is departing from size barrel, therefore the slurry thrown away can enter into size barrel
Row recovery, does not pollute the environment not only, and cost-effective.
After slurry coats, carrier is immersed in 1g/L palladium bichloride ammonia solution, magnetic agitation 4h, make to adsorb palladium on carrier
Ion, then take out, blow down redundant solution, dry, using 120 DEG C of dry 4h, 500 DEG C of roasting 2h, cooling, so as to be coated with
The catalyst of simple substance palladium.After testing, the catalyst reaches more than 99% to CO, HC and NO conversion ratio.The present invention is made by ball milling
Catalyst fines particle refines, and its crystallite dimension reaches nanoscale；Meanwhile using lanthanoid metal so that the activity of catalyst is changed
It is kind；The present invention carries out plating palladium also on carrier, and not only coating is uniform, fine and close, and chemical stability is good, and hardness is high, lubricity
Property it is good, wear-resistant and anti-scuffing function is strong.
Above-mentioned embodiment is used for illustrative purposes only, and is not limitation of the present invention, relevant technical field
Those of ordinary skill, can be so that various changes can be made and modification without departing from the spirit and scope of the present invention, therefore institute
There is equivalent technical scheme also to belong to scope of the invention.
Claims (8)
1. the processing technology of ternary catalyst for automobile tail gas, it comprises the following steps：
（1）By mass fraction by zirconium oxide, cerium oxide and lanthanum powder mixing and ball milling, then add alumina powder and continue ball milling, obtain
Composite powder；
（2）Above-mentioned composite powder is configured to slurry with deionized water；
（3）Pretreated hollow column like catalyst carrier is set in outside cylinder, drives carrier to immerse in above-mentioned slurry by cylinder；
（4）After slurry is fully supported on carrier, mobile cylinder simultaneously drives carrier to remove slurry；
（5）Slurry unnecessary in carrier duct is thrown away by rotating the cylinder, and reclaims the slurry thrown away；
（6）Then carrier is immersed in palladium bichloride ammonia solution, then takes out and dry, be calcined, cooling down, obtain catalyst.
2. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：The composite powder
In, zirconium oxide accounts for 4-8wt%, and cerium oxide accounts for 15-20wt%, and lanthanum accounts for 2-4wt%, and surplus is aluminum oxide.
3. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：The mixing and ball milling time is
30-50h, continuation Ball-milling Time are 20-40h.
4. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：Ball milling using 180-
220r/min rotating speed, ratio of grinding media to material are（9—10）:1.
5. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：The composite powder and
Deionized water is delivered in size barrel respectively is stirred mixing.
6. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：The cylinder bottom is set
It is equipped with the agitating paddle that mixing is stirred to slurry.
7. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：It is upper in the cylinder
The support chip for supporting the carrier is provided with the upside of the agitating paddle.
8. the processing technology of ternary catalyst for automobile tail gas according to claim 1, it is characterised in that：It is upper in the cylinder
Several pieces micro-blades are provided with the upside of the support chip, the carrier is set in blade outboard, is revolved by cylinder band movable vane piece
Wind-force caused by turning throws away slurry unnecessary in carrier duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710699132.1A CN107519857B (en) | 2017-08-16 | 2017-08-16 | Processing technology of automobile exhaust three-way catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710699132.1A CN107519857B (en) | 2017-08-16 | 2017-08-16 | Processing technology of automobile exhaust three-way catalyst |
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| Publication Number | Publication Date |
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| CN107519857A true CN107519857A (en) | 2017-12-29 |
| CN107519857B CN107519857B (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710699132.1A Active CN107519857B (en) | 2017-08-16 | 2017-08-16 | Processing technology of automobile exhaust three-way catalyst |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113837A (en) * | 2018-08-31 | 2019-01-01 | 长春工程学院 | A kind of catalysis treatment method of vehicle exhaust |
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| CN2805609Y (en) * | 2005-06-08 | 2006-08-16 | 陈庆东 | Iron stone hot pot |
| CN105688905A (en) * | 2016-04-27 | 2016-06-22 | 柳州申通汽车科技有限公司 | Preparation technology of automobile exhaust catalyst |
| CN105772025A (en) * | 2016-04-27 | 2016-07-20 | 柳州申通汽车科技有限公司 | Preparation method of automobile exhaust ternary catalyst |
| CN105797708A (en) * | 2016-04-27 | 2016-07-27 | 柳州申通汽车科技有限公司 | Preparation method of ternary tail gas catalyst |
| CN105903467A (en) * | 2016-04-27 | 2016-08-31 | 柳州申通汽车科技有限公司 | Preparation method of palladium-only automobile exhaust catalyst |
-
2017
- 2017-08-16 CN CN201710699132.1A patent/CN107519857B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2805609Y (en) * | 2005-06-08 | 2006-08-16 | 陈庆东 | Iron stone hot pot |
| CN105688905A (en) * | 2016-04-27 | 2016-06-22 | 柳州申通汽车科技有限公司 | Preparation technology of automobile exhaust catalyst |
| CN105772025A (en) * | 2016-04-27 | 2016-07-20 | 柳州申通汽车科技有限公司 | Preparation method of automobile exhaust ternary catalyst |
| CN105797708A (en) * | 2016-04-27 | 2016-07-27 | 柳州申通汽车科技有限公司 | Preparation method of ternary tail gas catalyst |
| CN105903467A (en) * | 2016-04-27 | 2016-08-31 | 柳州申通汽车科技有限公司 | Preparation method of palladium-only automobile exhaust catalyst |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113837A (en) * | 2018-08-31 | 2019-01-01 | 长春工程学院 | A kind of catalysis treatment method of vehicle exhaust |
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| CN107519857B (en) | 2020-07-14 |
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Effective date of registration: 20230105 Address after: 545616 room 2-2, 2nd floor, No.60 zhengtongdao, Luorong Town, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Liuzhou Xinkai Chaohua Technology Co.,Ltd. Address before: 545000 Liudong New District, Liuzhou City, Guangxi Zhuang Autonomous Region, No. 2 Shuiwan Road, No. 2 Liudong Standard Factory Building, Second Floor 212 Patentee before: LIUZHOU SHENTONG AUTOMOBILE TECHNOLOGY Co.,Ltd. |