CN103316689A - Three-way catalytic converter carrier and manufacturing method thereof - Google Patents
Three-way catalytic converter carrier and manufacturing method thereof Download PDFInfo
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- CN103316689A CN103316689A CN2013102297376A CN201310229737A CN103316689A CN 103316689 A CN103316689 A CN 103316689A CN 2013102297376 A CN2013102297376 A CN 2013102297376A CN 201310229737 A CN201310229737 A CN 201310229737A CN 103316689 A CN103316689 A CN 103316689A
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Abstract
The invention discloses a three-way catalytic converter carrier and a manufacturing method thereof, characterized in that the three-way catalytic converter carrier is set in the front side and the back side of a three-way catalytic converter of an engine exhaust pipe, and the three-way catalytic converter carrier are mainly woven wire carrier with coatings on the surface; the coatings are slurry made from cerium-zirconium composite oxide RC-25, cerium-zirconium composite oxide RC-35, alumina, aluminium glue and deionized water. By dipping the woven wire carrier in the slurry, the woven wire is provided with reinforcing function for harmful gas in tail gas, and can strictly control the discharge of the tail gas and realize harmless discharge if the three-way catalytic converter is out of service.
Description
Technical field
The present invention relates to a kind of ternary catalyzing unit repair vector and preparation method thereof, ternary catalyzing unit repair vector of especially a kind of good purification and preparation method thereof.
Background technology
Ternary catalyzing unit is mounted in most important outer purifier in the automobile exhaust system, has carbon monoxide (CO), hydrocarbon (HC) and the nitrogen oxide (NO that vehicle exhaust can be discharged
x) etc. pernicious gas by oxidation and reduction, change harmless carbon dioxide, water and nitrogen into.Because ternary catalyzing unit can be converted into innocuous substance with the harmful substances that mainly contains in the waste gas simultaneously; therefore day by day harsh along with environmental protection requirement; increasing automobile has been installed ternary catalyzing unit; utilize it to be installed in the exhaust pipe of engine; by redox reaction carbon dioxide and nitrogen, thereby realize harmless emission.But the long-time use along with ternary catalyzing unit, a series of phenomenons such as inefficacy, sintering, breakage, disappearance can appear in the ternary catalyzing unit in the vehicle, thereby along with the appearance of the problems such as inefficacy, there is underproof problem in the tail gas of discharging, thereby does not accomplish harmless emission.
Summary of the invention
Technical problem to be solved by this invention provides a kind of ternary catalyzing unit repair vector and preparation method thereof, by will be with the wire mesh carrier of coat, be arranged on exhaust pipe of engine ternary catalyzing unit the place ahead and rear, remedy the purification to tail gas, accomplish harmless emission.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of ternary catalyzing unit repair vector, its innovative point is: described ternary catalyzing unit repair vector is arranged at exhaust pipe of engine ternary catalyzing unit the place ahead and rear, be mainly the wire mesh carrier of surface band coat, described coat is the slurry by the deionized water preparation of the aluminium glue of the aluminium oxide of the cerium zirconium compound oxide RC-35 of the cerium zirconium compound oxide RC-25 of part by weight 6.8%, part by weight 6.8%, part by weight 17.0%, part by weight 1.36% and surplus.
Further, the preparation method for the ternary catalyzing unit repair vector mainly comprises the steps:
A) at first, cerium zirconium compound oxide RC-25, the cerium zirconium compound oxide RC-35, aluminium oxide, aluminium glue and the ionized water that take by weighing aforementioned proportion are poured in the stainless steel cask, then utilize mixer that the raw material in the stainless steel cask is stirred, and mixing time is 4h;
B) then stainless steel cask is moved on the thermostatic oven and heat, keeping heating-up temperature is 65 ~ 75 ℃, in the heating process, utilizes cutter that the raw material in the stainless steel cask is sheared, and the maintenance rotating speed is 3000rad/s, and shear time is 72h;
C) after shearing finishes, remove thermostatic oven and cutter, the stainless steel cask nature ageing 48h of raw material then will be housed;
D) then detect the granularity of raw material, when raw material particle size during less than or equal to 7.0 microns, namely obtain required coat slurry; If the granularity of raw material greater than 7.0 microns, is then returned step a;
E) then take by weighing the slurry of constant weight, add noble metal in slurry, so that the ratio of slurry and noble metal is 240:1, and utilizes mixer that it is stirred, mixing time is 2.5 ~ 3.0h;
F) at last wire mesh carrier is immersed in the slurry among the step e, utilizes coating machine that wire mesh carrier is evenly applied, apply finish after, natural air drying 3h, then roasting 2.5h again, sintering temperature is 600 ℃.
Further, the noble metal among the described step e is mainly one or more of Europe two, Europe three, Ou Wuzhong.
Further, be added with red fuming nitric acid (RFNA) in the slurry among the described step e, so that slurry and red fuming nitric acid (RFNA) ratio are 55:1.
Further, have additional the oxidation operation of a wire mesh carrier between described steps d and step e, the oxidizing temperature of described wire mesh carrier is 800 ℃, and oxidation operation insulation duration is 1h.
The invention has the advantages that: by before and after exhaust pipe of engine ternary catalyzing unit, being provided with the wire mesh carrier of coat, because coat be the slurry that the deionized water by the aluminium glue of the aluminium oxide of the cerium zirconium compound oxide RC-35 of the cerium zirconium compound oxide RC-25 of part by weight 6.8%, part by weight 6.8%, part by weight 17.0%, part by weight 1.36% and surplus prepares, thus make it with tail gas in CO, HC and NO
xReact, obtain harmless carbon dioxide, water and nitrogen, thereby for the situation of ternary catalyzing unit failure in a long time, strictly the discharging of control tail gas, accomplish harmless emission.
Also there is following advantage in the soft carrier of woven wire in addition: the wall thickness of the soft carrier of l. woven wire can be as thin as 0. 04mm, and its effective cross-section increases greatly, thereby can reduce exhaust back pressure, help to reduce the engine power loss.2. the soft carrier of woven wire has larger geometrical surface, can save the consumption of noble metal under the condition that obtains identical purifying property.3. the Fast light-off that the heat conductivility that the soft carrier of woven wire is good and lower thermal capacity help catalyst, thereby and the dissipation of heat that can in time catalytic combustion be produced avoid hot-spot.4. the ductility of the soft carrier of woven wire is good, and shock resistance is strong, is difficult for embrittlement, has more lasting mechanical life.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Diagram is wire mesh carrier mounting structure schematic diagram in a kind of ternary catalyzing unit repair vector of the present invention and preparation method thereof.
Among the figure: 1-ternary catalyzing unit, 2-blast pipe, 3-wire mesh carrier.
The specific embodiment
Ternary catalyzing unit repair vector of the present invention is mainly the wire mesh carrier 3 of surface band coat, this wire mesh carrier 3 is arranged at ternary catalyzing unit 1 the place ahead and rear in the exhaust pipe of engine 2, thereby for problems such as ternary catalyzing unit failures in a long time, play the function that a reinforcement purifies, thereby guarantee to accomplish harmless emission through the tail gas that blast pipe is discharged.
Coat is the slurry by the deionized water preparation of the aluminium glue of the aluminium oxide of the cerium zirconium compound oxide RC-35 of the cerium zirconium compound oxide RC-25 of part by weight 6.8%, part by weight 6.8%, part by weight 17.0%, part by weight 1.36% and surplus in the wire mesh carrier of above-mentioned surface band coat.
The preparation method of ternary catalyzing unit repair vector of the present invention: at first, the deionized water that takes by weighing cerium zirconium compound oxide RC-25, cerium zirconium compound oxide RC-35, aluminium oxide, aluminium glue and the capacity of aforementioned proportion is poured in the stainless steel cask, then utilize mixer that the raw material in the stainless steel cask is stirred, mixing time is 4h.Then, stainless steel cask moved on the thermostatic oven heat, keeping heating-up temperature is 65 ~ 75 ℃, in the heating process, utilize cutter that the raw material in the stainless steel cask is sheared, the maintenance rotating speed is 3000rad/s, shear time is 72h, after shearing end, remove thermostatic oven and cutter, the stainless steel cask nature ageing 48h of raw material then will be housed;
Detect the granularity of raw material this moment, when raw material particle size during less than or equal to 7.0 microns, namely obtain required qualified coat slurry; If the granularity of raw material greater than 7.0 microns, is then returned initial step, so move in circles, until obtain required qualified slurry.
Then wire mesh carrier is carried out oxidation, find through great many of experiments, oxidizing temperature is set to 800 ℃, and the insulation duration is 1h, the ferrous (FeCr of chromous acid that the wire mesh carrier Surface Creation that obtains is tabular
2O
4) and alundum (Al2O3) (Al
2O
3) the solid solution whisker, and the slurry acidity value that this surface mass and respective outer side edges adapt to, being highly advantageous to strengthens the adhesive force on coating and woven wire surface.
Then, take by weighing constant weight and stir the slurry that obtains, in slurry, add noble metal, so that the ratio of slurry and noble metal is 240:1, noble metal is mainly one or more of Europe two, Europe three, Ou Wuzhong, then utilizes mixer that it is stirred, mixing time is 2.5 ~ 3.0h, be added with red fuming nitric acid (RFNA) in this process, the ratio of slurry and red fuming nitric acid (RFNA) is 55:1, thereby so that the pH value of slurry between 1.5 ~ 1.7.
At last wire mesh carrier is immersed in the slurry of above-mentioned steps acquisition, utilizes coating machine that wire mesh carrier is evenly applied, after coating finished, natural air drying 3h followed again roasting 2.5h, and sintering temperature is 600 ℃.
Claims (5)
1. ternary catalyzing unit repair vector, it is characterized in that: described ternary catalyzing unit repair vector is arranged at exhaust pipe of engine ternary catalyzing unit the place ahead and rear, be mainly the wire mesh carrier of surface band coat, described coat is the slurry by the deionized water preparation of the aluminium glue of the aluminium oxide of the cerium zirconium compound oxide RC-35 of the cerium zirconium compound oxide RC-25 of part by weight 6.8%, part by weight 6.8%, part by weight 17.0%, part by weight 1.36% and surplus.
2. the preparation method of a kind of ternary catalyzing unit repair vector according to claim 1 is characterized in that comprising the steps:
A) at first, cerium zirconium compound oxide RC-25, the cerium zirconium compound oxide RC-35, aluminium oxide, aluminium glue and the deionized water that take by weighing aforementioned proportion are poured in the stainless steel cask, then utilize mixer that the raw material in the stainless steel cask is stirred, and mixing time is 4h;
B) then stainless steel cask is moved on the thermostatic oven and heat, keeping heating-up temperature is 65 ~ 75 ℃, in the heating process, utilizes cutter that the raw material in the stainless steel cask is sheared, and the maintenance rotating speed is 3000rad/s, and shear time is 72h;
C) after shearing finishes, remove thermostatic oven and cutter, the stainless steel cask nature ageing 48h of raw material then will be housed;
D) then detect the granularity of raw material, when raw material particle size during less than or equal to 7.0 microns, namely obtain required coat slurry; If the granularity of raw material greater than 7.0 microns, is then returned step a;
E) then take by weighing the slurry of constant weight, add noble metal in slurry, so that the ratio of slurry and noble metal is 240:1, and utilizes mixer that it is stirred, mixing time is 2.5 ~ 3.0h;
F) at last wire mesh carrier is immersed in the slurry among the step e, utilizes coating machine that wire mesh carrier is evenly applied, apply finish after, natural air drying 3h, then roasting 2.5h again, sintering temperature is 600 ℃.
3. the preparation method of a kind of ternary catalyzing unit repair vector according to claim 2 is characterized in that: the noble metal among the described step e is mainly one or more of Europe two, Europe three, Ou Wuzhong.
4. the preparation method of a kind of ternary catalyzing unit repair vector according to claim 3 is characterized in that: be added with red fuming nitric acid (RFNA) in the slurry among the described step e, so that slurry and red fuming nitric acid (RFNA) ratio are 55:1.
5. the preparation method of a kind of ternary catalyzing unit repair vector according to claim 2, it is characterized in that: the oxidation operation that has additional a wire mesh carrier between described steps d and step e, the oxidizing temperature of described wire mesh carrier is 800 ℃, and oxidation operation insulation duration is 1h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117463364A (en) * | 2023-12-26 | 2024-01-30 | 陕西煤基特种燃料研究院有限公司 | Rh-Ru-based bimetallic load kerosene reforming catalyst and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08229350A (en) * | 1995-02-24 | 1996-09-10 | I C T:Kk | Catalyst for decomposing nitrogen oxide and purifying method of diesel engine exhaust gas using the same |
| US5674461A (en) * | 1993-12-09 | 1997-10-07 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust device |
| CN101015800A (en) * | 2007-02-07 | 2007-08-15 | 大连理工大学 | Honeycomb metal wire net carrier catalyst for catalytically reducing nitrogen oxide and preparing method thereof |
| CN101444734A (en) * | 2008-12-12 | 2009-06-03 | 无锡威孚环保催化剂有限公司 | Catalyst for purifying exhaust gas from non-road miniature diesel engine, and preparation method thereof |
-
2013
- 2013-06-09 CN CN2013102297376A patent/CN103316689A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5674461A (en) * | 1993-12-09 | 1997-10-07 | Honda Giken Kogyo Kabushiki Kaisha | Exhaust device |
| JPH08229350A (en) * | 1995-02-24 | 1996-09-10 | I C T:Kk | Catalyst for decomposing nitrogen oxide and purifying method of diesel engine exhaust gas using the same |
| CN101015800A (en) * | 2007-02-07 | 2007-08-15 | 大连理工大学 | Honeycomb metal wire net carrier catalyst for catalytically reducing nitrogen oxide and preparing method thereof |
| CN101444734A (en) * | 2008-12-12 | 2009-06-03 | 无锡威孚环保催化剂有限公司 | Catalyst for purifying exhaust gas from non-road miniature diesel engine, and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117463364A (en) * | 2023-12-26 | 2024-01-30 | 陕西煤基特种燃料研究院有限公司 | Rh-Ru-based bimetallic load kerosene reforming catalyst and preparation method thereof |
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Application publication date: 20130925 |