CN107519857B - Processing technology of automobile exhaust three-way catalyst - Google Patents
Processing technology of automobile exhaust three-way catalyst Download PDFInfo
- Publication number
- CN107519857B CN107519857B CN201710699132.1A CN201710699132A CN107519857B CN 107519857 B CN107519857 B CN 107519857B CN 201710699132 A CN201710699132 A CN 201710699132A CN 107519857 B CN107519857 B CN 107519857B
- Authority
- CN
- China
- Prior art keywords
- carrier
- slurry
- automobile exhaust
- column body
- processing technology
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- B01J23/10—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
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention relates to the field of automobile exhaust purification, in particular to a processing technology of an automobile exhaust three-way catalyst, which comprises the steps of mixing, ball-milling and grinding zirconium oxide, cerium oxide and lanthanum powder into composite powder according to mass fractions; preparing the composite powder into slurry by using deionized water; immersing the pretreated hollow columnar carrier into the slurry; after the slurry is fully loaded on the carrier, moving the column body and driving the carrier to move out of the slurry; surplus slurry in the carrier pore passage is thrown out by rotating the cylinder, and the thrown slurry is recycled; and then soaking the carrier into a palladium chloride ammonia solution, taking out, drying, roasting and cooling to obtain the catalyst. The invention refines the catalyst powder particles by ball milling, and the grain size reaches the nanometer level; meanwhile, the activity of the catalyst is improved by adopting metal lanthanum; the slurry in the pore channel is thrown out from the inside of the carrier outwards by utilizing centrifugal force, so that wind power can be prevented from blowing to the outer surface of the carrier, and the uniformity of the coating on the outer surface of the carrier is ensured.
Description
Technical Field
The invention relates to the field of automobile exhaust purification, in particular to a processing technology of an automobile exhaust three-way catalyst.
Background
The existing three-way catalyst consists of a honeycomb-shaped ceramic or metal carrier and a catalyst coating attached to the carrier. The catalyst coating layer is generally composed of an oxide material (such as alumina) with a large specific surface area, an oxygen storage material, and a precious metal active component (often one or more of Pt (platinum), Pd (palladium), and Rh (rhodium)) dispersed on the surface of the oxide or oxygen storage material. The oxygen storage material is a composite oxide containing cerium and zirconium, and the proportion of oxidizing components and reducing components in the tail gas is adjusted by adsorbing oxygen in the stored tail gas or releasing oxygen, so that carbon monoxide and hydrocarbon oxygen are oxidized and nitrogen oxides are reduced. The current three-way catalysts generally adopt a double-coating structure, i.e., a lower coating layer attached to a honeycomb carrier supports Pd, and an upper coating layer attached to the lower coating layer supports Rh. The activity of Rh catalytic reduction oxynitride after high-temperature aging is obviously improved, but due to the insufficient oxygen storage capacity, the pollutant emission under the transient working condition is still very high, and especially for the oxynitride emission which is very sensitive to the change of tail gas air-fuel ratio, the purification effect of the catalyst is not ideal.
Disclosure of Invention
Aiming at the technical problems, the invention provides a processing technology of an automobile exhaust three-way catalyst capable of improving the exhaust purification effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: the processing technology of the automobile exhaust three-way catalyst comprises the following steps:
(1) mixing zirconium oxide, cerium oxide and lanthanum powder according to mass fraction, ball-milling, adding aluminum oxide powder, and continuing ball-milling to obtain composite powder;
(2) preparing the composite powder into slurry by using deionized water;
(3) sleeving the pretreated hollow columnar carrier outside the column body, and driving the carrier to be immersed in the slurry through the column body;
(4) after the slurry is fully loaded on the carrier, moving the column body and driving the carrier to move out of the slurry;
(5) surplus slurry in the carrier pore passage is thrown out by rotating the cylinder, and the thrown slurry is recycled;
(6) and then soaking the carrier into a palladium chloride ammonia solution, taking out, drying, roasting and cooling to obtain the catalyst.
Preferably, in the composite powder, zirconia accounts for 4-8 wt%, ceria accounts for 15-20 wt%, lanthanum accounts for 2-4 wt%, and the balance is alumina.
Preferably, the mixing and ball milling time is 30-50 h, and the continuous ball milling time is 20-40 h.
Preferably, the ball mill adopts a rotating speed of 180-220 r/min, and the ball-to-material ratio is (9-10): 1.
Preferably, the composite powder and the deionized water are respectively conveyed to a slurry barrel to be stirred and mixed.
Preferably, the bottom end of the column body is provided with a stirring paddle for stirring and mixing the slurry.
Preferably, a support piece for supporting the carrier is arranged on the column body and above the stirring paddle.
Preferably, the cylinder is provided with a plurality of micro blades on the upper side of the support sheet, the carrier is sleeved on the outer sides of the blades, and the redundant slurry in the carrier pore channel is thrown out by wind power generated by driving the blades to rotate through the cylinder.
According to the technical scheme, the catalyst powder particles are refined by ball milling, and the grain size reaches the nanometer level; meanwhile, the activity of the catalyst is improved by adopting metal lanthanum; the slurry in the pore channel is thrown out from the inside of the carrier outwards by utilizing centrifugal force, so that wind power can be prevented from blowing to the outer surface of the carrier, and the uniformity of the coating on the outer surface of the carrier is ensured.
Detailed Description
The invention is described in detail below, with illustrative embodiments and descriptions of the invention provided herein to explain the invention without limiting it.
The processing technology of the automobile exhaust three-way catalyst comprises the following steps:
firstly, mixing zirconia, ceria and lanthanum powder according to mass fraction, ball-milling for 30-50 h, adding alumina, and continuing ball-milling for 20-40 h to obtain composite powder, wherein zirconia accounts for 4-8 wt%, ceria accounts for 15-20 wt%, lanthanum accounts for 2-4 wt%, and the balance is alumina, rotating speed of 180-220 r/min is adopted in the ball-milling process, and the ball-material ratio of (9-10): 1 is adopted, so that nanoscale composite powder can be obtained.
After nano-scale composite powder is obtained, preparing the composite powder material into slurry by using deionized water; composite powder material and deionized water carry respectively and stir the mixture in to the thick liquids bucket, make the material mix the mixing, at implementation, the cylinder bottom is provided with carries out the stirring rake that stirs the mixture to thick liquids, is favorable to making things convenient for the stirring. Meanwhile, the hollow columnar carrier needs to be pretreated to facilitate loading of the coating, then the hollow columnar carrier is sleeved outside the column body, and the carrier is driven by the column body to be immersed into the slurry; the support sheet arranged on the column body and positioned on the upper side of the stirring paddle can support the carrier on one hand, and can prevent the carrier from contacting with the stirring paddle on the other hand, so that the carrier is prevented from being damaged by the rotation of the stirring paddle.
After the slurry is fully loaded on the carrier, the cylinder is moved and drives the carrier to move out of the slurry, so that the carrier loaded with the coating is separated from the slurry barrel, and then the cylinder is rotated to throw out the redundant slurry in the pore channel of the carrier; according to the invention, the plurality of miniature blades are arranged on the cylinder body and positioned on the upper side of the support sheet, the carrier is sleeved on the outer sides of the blades, and redundant slurry in a carrier pore passage is thrown out by wind power generated by driving the blades to rotate through the cylinder body, so that the coating of the carrier is ensured to be uniform. In the implementation process, the supporting plate is provided with a stop block for preventing the carrier from rotating, so that the coating on the surface of the carrier can be prevented from being thrown away due to the rotation of the carrier. When the redundant slurry in the pore canal is thrown out, the carrier is separated from the slurry barrel, so the thrown slurry can enter the slurry barrel to be recycled, the environment is not polluted, and the cost is saved.
After the slurry is coated, a carrier is immersed into 1 g/L of palladium chloride ammonia solution, magnetic stirring is carried out for 4 hours, palladium ions are adsorbed on the carrier, then the carrier is taken out, redundant solution is blown off, air drying is carried out, drying is carried out for 4 hours at 120 ℃, roasting is carried out for 2 hours at 500 ℃, and cooling is carried out, so that the catalyst plated with the elemental palladium is obtained.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention.
Claims (5)
1. The processing technology of the automobile exhaust three-way catalyst comprises the following steps:
(1) mixing zirconium oxide, cerium oxide and lanthanum powder according to mass fraction, ball-milling, adding aluminum oxide powder, and continuing ball-milling to obtain composite powder;
(2) preparing the composite powder into slurry by using deionized water;
(3) sleeving the pretreated hollow columnar carrier outside the column body, and driving the carrier to be immersed in the slurry through the column body;
(4) after the slurry is fully loaded on the carrier, moving the column body and driving the carrier to move out of the slurry;
(5) surplus slurry in the carrier pore passage is thrown out by rotating the cylinder, and the thrown slurry is recycled;
(6) then immersing the carrier into a palladium chloride ammonia solution, taking out, drying, roasting and cooling to obtain a catalyst; the bottom end of the column body is provided with a stirring paddle for stirring and mixing the slurry; a support sheet for supporting the carrier is arranged on the column body and positioned on the upper side of the stirring paddle; the column body is provided with a plurality of miniature blades on the upper side of the support sheet, the carrier is sleeved on the outer sides of the blades, and redundant slurry in a carrier pore passage is thrown out by wind power generated by driving the blades to rotate through the column body.
2. The processing technology of the automobile exhaust three-way catalyst according to claim 1, characterized in that: in the composite powder, zirconia accounts for 4-8 wt%, ceria accounts for 15-20 wt%, lanthanum accounts for 2-4 wt%, and the balance is alumina.
3. The processing technology of the automobile exhaust three-way catalyst according to claim 1, characterized in that: the mixing and ball milling time is 30-50 h, and the continuous ball milling time is 20-40 h.
4. The processing technology of the automobile exhaust three-way catalyst according to claim 1, characterized in that: the ball milling adopts the rotating speed of 180-220 r/min, and the ball-material ratio is (9-10): 1.
5. The processing technology of the automobile exhaust three-way catalyst according to claim 1, characterized in that: and respectively conveying the composite powder and the deionized water to a slurry barrel for stirring and mixing.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107519857A CN107519857A (en) | 2017-12-29 |
| CN107519857B true CN107519857B (en) | 2020-07-14 |
Family
ID=60681270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710699132.1A Active CN107519857B (en) | 2017-08-16 | 2017-08-16 | Processing technology of automobile exhaust three-way catalyst |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107519857B (en) |
Families Citing this family (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 |
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 |
-
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107519857A (en) | 2017-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1134297C (en) | Catalyst composition containing oxygen storage components | |
| US9566568B2 (en) | Catalyst design for heavy-duty diesel combustion engines | |
| US10183276B2 (en) | Rhodium-containing catalysts for automotive emissions treatment | |
| CN110614101A (en) | Catalyst for catalytic combustion of VOCs and preparation method thereof | |
| CN102909020B (en) | Sulfur-resistant catalytic-combustion catalyst and preparation method thereof | |
| JP2004508186A (en) | Exhaust gas purification catalyst composition | |
| EP2542339A2 (en) | Carbon monoxide conversion catalyst | |
| CN1271618A (en) | High performance catalyst | |
| CN102631917A (en) | Oxidation catalyst for purifying tail gas of diesel vehicle and preparation method for oxidation catalyst | |
| CN103041873A (en) | Catalytic combustion catalyst and preparation method thereof | |
| CN106999921B (en) | Titania doped zirconia as platinum group metal support in catalysts for treating exhaust gas streams from combustion engines | |
| US20120172212A1 (en) | Tri-layer structured metal oxides composite material and method for manufacturing the same | |
| CN1842370A (en) | Improved noble metal catalyst | |
| CN107519857B (en) | Processing technology of automobile exhaust three-way catalyst | |
| CN105688905A (en) | Preparation technology of automobile exhaust catalyst | |
| CN105251485A (en) | Motor vehicle exhaust purification catalyst and production process thereof | |
| JP5925956B2 (en) | Exhaust gas purification catalyst composition and exhaust gas purification catalyst | |
| CN1178717A (en) | Air purifying catalyst carrying noble metal particle and its preparing method | |
| JP5940992B2 (en) | Exhaust gas purification catalyst | |
| CN116371405B (en) | Ternary catalyst and preparation method and application thereof | |
| CN107376910A (en) | The process equipment of ternary catalyst for automobile tail gas | |
| CN107537488B (en) | Preparation method of three-way catalyst for automobile | |
| CN107519943B (en) | Method for treating catalyst slurry for automobile | |
| CN109261147B (en) | Pt-Pd single-coating catalyst for treating benzene substances and preparation method thereof | |
| CN1311903C (en) | Method for preparing rare earth base high-performance three-effect catalyst |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
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. |
|
| TR01 | Transfer of patent right |