CN100389247C - Motor vehicle exhaust catalytic converter, and its preparing method - Google Patents
Motor vehicle exhaust catalytic converter, and its preparing method Download PDFInfo
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- CN100389247C CN100389247C CNB2005100356017A CN200510035601A CN100389247C CN 100389247 C CN100389247 C CN 100389247C CN B2005100356017 A CNB2005100356017 A CN B2005100356017A CN 200510035601 A CN200510035601 A CN 200510035601A CN 100389247 C CN100389247 C CN 100389247C
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- 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
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a motor vehicle exhaust catalytic converter, where the catalyst carrier is a metal cellular carrier using hot dip aluminized thin steel plate as precursor and made by micro-arc oxidized ceramic film process; the carried catalyst coating is a noble metal-rare earth combined catalyst coating formed on the carrier by making YSZ and Pd into mixed pulp and coating it on the carrier. And the invention also discloses a method for preparing the motor vehicle exhaust catalytic converter, making hot dip plating aluminum by salt bath process and in situ growing the ceramic film on the surface of the hot dip aluminized thin steel plate by micro-arc oxidizing process, where the ceramic film has a structure of crystalline oxide ceramic phase, compact and even, firm to bond, and having low making energy consumption, and outstanding advantages of improving purifying effect and prolonging the service life. And it is applied to exhaust purification for various motor vehicles using leadless gasoline.
Description
Technical field
The present invention relates to oxious component to I. C. engine exhaust and carry out catalyzed conversion and handle and make it become nontoxic or other venting gas appliance, especially relate to a kind of motor vehicle exhaust catalytic converter and preparation method thereof.
Background technique
A large amount of uses of Motor Vehicle more and more aggravate the pollution level of atmosphere, and the current mobility tail gas purifies mainly takes emission controls by improving combustion and external purification dual mode.And external purification mainly adopts in vent systems and to install by preceding deflector, carrier shell, back deflector and place in the carrier shell exhaust gas catalytic converter of being made up of the honeycomb ceramic carrier of the substrate of flat and the mutual coiling and molding of wavy wave support plate to solve the tail gas clean-up problem.Motor vehicle exhaust catalytic converter be exactly a kind of be installed in the motor vehicle exhaustion system by catalyzer reduce and oxidation reaction to reduce the catalytic convention design of carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) discharge amount in the exhaust simultaneously.Existing motor vehicle exhaust catalytic converter generally is to adopt catalyzer such as noble metal type, non-noble metal type, precious metal and rare earth be compound, and is made into the coating coated that contains catalyzer is combined into catalytic converter on pottery or metallic carrier.Catalyst metal carrier commonly used is to adopt the FeCrAl alloy to claim high aluminium stainless steel to make again mostly, and the surface smoothing of this metallic carrier does not have the porous structure of ceramic monolith; And variant with the thermal expansion coefficient of stupalith, there is serious mutual thermal stress in the interface when causing thermal cycle; Because the substrate material surface diffusion can cause the matrix surface oxidation, on this metallic carrier, can not directly upload the crystalline oxide active coating, in addition, the FeCrAl alloy costs an arm and a leg, and price 8 per ton～200,000 yuan does not wait.For solve catalyst coat and carrier in use combine life problems, technologies such as main at present employing high temperature oxidation, alramenting, plasma spraying, electric arc spraying and electrophoretic deposition are carried out pretreatment to metal carrier surface, generate between one deck and the metallic carrier and be chemical bond and the transition layer of good heat coupling arranged, make metallic carrier and aluminum oxide coating layer energy strong bonded with active coating.Yet high temperature oxidation process is to generate the alumina whisker transition layer in the FeCrAl metal surface, only is suitable for being rich in the metallic carrier of aluminium, and common metallic carrier can not adopt this kind technology, and its industrial applications is restricted; Metal carrier surface is phosphorous after the alramenting process treating, cause the catalyzer phosphorism easily, form the glass transition compound at catalyst surface, cause the active site loss, reduce catalytic activity, cause that catalytic converter is too fast to lose part or all of function, the working life of obviously reducing catalytic converter, phosphating process also can pollute environment, is not suitable for use in the process of surface treatment of metallic carrier; Can cause waste of material as for carry out plasma spray coating process on wire mesh carrier, simultaneously coating can not degree of depth spraying, metal beehive carrier that can not deal with complex shapes; Equally also there is the problem of waste of material in electric arc spraying, is not suitable for preparing the coating of porous matrix, and energy consumption is bigger, and cost is higher relatively, has influenced being extensive use of of catalytic converter to a certain extent.
Summary of the invention
Technical problem to be solved by this invention is the defective that remedies prior art, proposes a kind ofly to improve purifying effect, increases the service life and cost is relatively low motor vehicle exhaust catalytic converter.
Another technical problem to be solved by this invention is the preparation method who proposes a kind of motor vehicle exhaust catalytic converter.
For motor vehicle exhaust catalytic converter of the present invention, above-mentioned technical problem is solved like this:
This motor vehicle exhaust catalytic converter, comprise carrier shell, place the catalyst carrier in the carrier shell, and the preceding deflector, the back deflector that place the catalyst carrier front and back respectively, described catalyst carrier is the honeycomb substrate by the substrate of flat and the mutual coiling and molding of wavy wave support plate.
The characteristics of this motor vehicle exhaust catalytic converter are:
Described catalyst carrier is the metal beehive carrier of making as precursor employing ceramic coating formed by micro-arc oxidation technology with the hot-dip aluminizing sheet metal, satisfies automobile, the motorcycle catalytic converter general technical specifications of national sector standard regulation.
The moment in micro-arc discharge district, nearly 2000 ℃ high temperature sintering effect made the ceramic membrane of growth in situ have crystalline oxide such as α-Al
2O
3, γ-Al
2O
3The ceramic phase structure, not only evenly fine and close, and in conjunction with firm.The liquid cooled speed height in differential of the arc zone, the hardness distribution gradient between oxide ceramic membrane and the substrate material so more helps uploading of catalyst activity coating, can improve purifying effect, increase the service life and cost relatively low.
The catalyst coat that described catalyst carrier is uploaded is precious metal and rare earth composite catalyst coating, is to be made into mixed slurry and to be coated in the coating that forms on the catalyst carrier make the yttria-stabilized zirconia ZrO2 (YSZ) of additive and palladium (Pd) with rare earth oxide Y2O3.
YSZ is high temperature resistant high-ratio surface material, it is oxygen ion conductor preferably, has good oxygen ion conduction function and electric conductivity, YSZ is fully mixed with active component Pd, can promote activity of such catalysts, can improve oxidation, the reduction reaction rate of catalyzer to a great extent, can also make catalyzer on the mounting point with the engine exhaust port close-coupled, shorten the catalyzer light-off time to greatest extent, reduce pollutant emission.
The content ratio of YSZ and Pd is (800～1200) in described YSZ and the Pd mixed slurry: 1, take into account the cost that improves activity of such catalysts and reduce catalytic converter, the preferred content ratio is (900～1000): 1, because YSZ content is excessive, can reduce activity of such catalysts, YSZ content is too small, again can corresponding increase cost.
For motor vehicle exhaust catalytic converter of the present invention, above-mentioned technical problem is to solve according to qualifications like this:
Described sheet metal is to comprise that grade of steel is the carbon steel thin plate of A3, Q235 or comprise that grade of steel is 304,316 Stainless Sheet Steel.
For the preparation method of motor vehicle exhaust catalytic converter of the present invention, above-mentioned technical problem is solved like this:
The preparation method of this motor vehicle exhaust catalytic converter, comprise and adopt first volume method or back volume legal system to make metal beehive carrier, and coating active coating, described first volume method is earlier sheet metal to be rolled the fastening again typing of honeycomb substrate, comprise later each step that applies active coating successively, described back volume method is earlier sheet metal to be comprised each step that applies active coating successively, rolls the fastening again typing of honeycomb substrate later on.
The preparation method's of this motor vehicle exhaust catalytic converter characteristics are:
Before applying the active coating step, have successively hot-dip aluminizing, the differential arc oxidation step;
Described hot-dip aluminizing is to adopt the salt bath legal system to be equipped with the hot-dip aluminizing sheet metal, with flat sheet metal or roll cellular sheet metal, immerse melt temperature and be 1min～5min in 710 ℃～750 ℃ the liquid aluminium, be cooled to room temperature after the proposition, form aluminium lamination at surface of thin steel sheet and be goods.
The hot-dip aluminizing sheet metal not only kept steel intrinsic good mechanical properties, but also have the various premium properties of surperficial aluminium coated: excellent decay resistance, its corrosion resistance is about 5～9 times of galvanized steel; Resistance to heat is good, reveals good heat/corrosion resistance 600 ℃ of following tables; High temperature oxidation resistance is equivalent to 1Crl8Ni9Ti (18-8) stainless steel; Mechanical processing characteristic is good, can stretch and punching press; Favorable conductive and heat-conducting property.The main component of the ferroaluminium layer that forms between matrix and aluminium lamination is that matrix is Fe
2Al
3Solid solution (FeCrNi)
2Al
5With matrix be FeAl
3Solid solution, also have the characteristics of high hardness, high wear resistance.
Described differential arc oxidation is to adopt micro-arc oxidation process at hot-dip aluminizing surface of thin steel sheet growth in situ ceramic membrane, the hot-dip aluminizing sheet metal is inserted electrolytic bath with temperature control and agitating function, connect DC electrical source and form micro-arc discharge on the thin steel of hot-dip aluminizing surface, the growth in situ ceramic membrane, make amorphous oxide become the crystalline state phase, described electrolyte solution is the mixed solution of silicate and hydroxide, the content ratio of silicate and hydroxide is (10～75): 1, the electrolyte solution temperature is 10 ℃～45 ℃, and current density is 0.010A/cm
2～0.10A/cm
2, DC electrical source voltage is 400V～700V.
When DC electrical source voltage during greater than 700V, can form arc discharge on the thin steel of hot-dip aluminizing surface, bigger acnode appears, send sharp-pointed Ping, form some pittings at ceramic membrane surface, destroy the performance of ceramic membrane, therefore, operating voltage will be controlled at below the micro-arc discharge district, makes it not enter the arc discharge district.The outstanding feature of micro-arc oxidation process is: reliable and stable, step and equipment are simple, and reaction is carried out at normal temperatures, easy to operate, the ceramic membrane of surface in situ growth is evenly fine and close, in conjunction with firmly, can improve surface hardness, wearability, heat resistance and the corrosion resistance of material significantly.Adopt the silicate of environment protection type and the alkaline electrolyte solution that hydroxide mixes, environmental pollution is little, meets the environment protection emission requirement.Electrolyte temperature is in room temperature range, and the shape of micro-arc oxidation workpiece can be complicated, and the part internal surface also can be handled.
For the preparation method of motor vehicle exhaust catalytic converter of the present invention, above-mentioned technical problem is to solve according to qualifications like this:
Described coating active coating is the compound coating of noble metal-coating and rare earth, is with rare earth oxide Y
2O
3Make the yttria-stabilized zirconia ZrO of additive
2(YSZ) and palladium (Pd) be made into mixed slurry and be coated in and form active coating on the catalyst carrier.
Described active coating is the active coating that forms through roasting.
The preparation of described YSZ has following steps successively:
1) according to mol ratio Y: Zr=50: 50 take by weighing Y (NO
3) 36H
2O and Zr (0
3) 45H
2O is a complexing agent with ammoniacal liquor, fully mixes, and heating-up temperature to 50 ℃～70 ℃, 15min～25min stirs the mixture;
2) speed with 30～50/min adds ammoniacal liquor, impels to generate pale brown look gel precipitation, and the pH value is adjusted to 9～12, seals up for safekeeping behind the stirring 60min;
3) filter the precipitation that produces, water cyclic washing sludge, flush away ammoniacal liquor and nitrate;
4) heating-up temperature to 110 ℃～150 ℃ of oven dry;
5) at 300 ℃～370 ℃ following pre-burning 1h～2h of temperature, again at 700 ℃～750 ℃ following roasting 3h～5h of temperature;
6) goods yttria-stabilized zirconia Y is taken out in the cooling back
0.5Zr
0.5O
2Powder.
The temperature of described roasting is 650 ℃～750 ℃.
For the preparation method of motor vehicle exhaust catalytic converter of the present invention, above-mentioned technical problem is further to solve like this:
The thickness of described aluminium plating membrane is 10 μ m～30 μ m, measures with the 0.01mm screw thread micrometer.
Described liquid aluminium is the commercial-purity aluminium of purity＞99.7wt%, and fluxing agent is NaCl+Na
3AlF
6
Described differential arc oxidation is a kind of in sodium silicate, potassium silicate, lithium metasilicate, the manganous silicate or two or more mixture arbitrarily with the silicate in the electrolyte solution.
Described differential arc oxidation is one or both a mixture in sodium hydroxide, the caustic potoash with the hydroxide in the electrolyte solution.
Preferred differential arc oxidation electrolyte solution is the mixed solution of sodium silicate and sodium hydroxide, and the content ratio of sodium silicate and sodium hydroxide is (20～60): 1.
Described sheet metal is to comprise that grade of steel is the carbon steel thin plate of A3, Q235 or comprise that grade of steel is 304,316 Stainless Sheet Steel.
The fastening typing of described first volume method is that soldering is fixed.Preferably vacuum brazing is fixed.
The fastening typing of described back volume method is that rivet is fixed.
Technique effect of the present invention is: the moment high temperature sintering effect in micro-arc discharge district makes the ceramic membrane of growth in situ have crystalline oxide ceramic phase structure, not only evenly fine and close, and in conjunction with firm, especially the ceramic coating formed by micro-arc oxidation power consumption of polymer processing is far below the existing making energy consumption that adopts FeCrAl alloy (high aluminium stainless steel) high temperature oxidation process, back volume method is only fixed with rivet, can also significantly reduce cost.The product contrast of the present invention and existing same size has the outstanding advantage that can improve purifying effect and increase the service life.The present invention is applicable to the catalytic converter of all kinds of Motor Vehicle of use unleaded gas as exhaust gas purification, can be the supporting OEM product of new production car, also can be the AFM product at the usefulness car that is used to change damage, lost efficacy or be used for not install purifier.
Description of drawings
Below the contrast accompanying drawing and in conjunction with embodiment the present invention is further detailed explanation:
Accompanying drawing is the tangent plane structural representation of the convoluted metal beehive carrier of concentric circle of embodiment.
Embodiment
A kind of motor exhaust catalytic converter
This motor exhaust catalytic converter, comprise carrier shell, place the catalyst carrier in the carrier shell, and the preceding deflector, the back deflector that place the catalyst carrier front and back respectively, described catalyst carrier is that accompanying drawing is its tangent plane structural representation by the convoluted metal beehive carrier of concentric circle of the substrate of flat and the mutual coiling and molding of wavy wave support plate.
Described catalyst carrier is the convoluted metal beehive carrier of making as precursor employing ceramic coating formed by micro-arc oxidation technology with the hot-dip aluminizing sheet metal of concentric circle, satisfies the motorcycle catalytic converter general technical specifications of national sector standard regulation.
The catalyst coat that described catalyst carrier is uploaded is precious metal and rare earth composite catalyst coating, is with rare earth oxide Y
2O
3Make the yttria-stabilized zirconia ZrO of additive
2(YSZ) and palladium (Pd) be made into mixed slurry and be coated in the coating that forms on the catalyst carrier.
The content ratio of YSZ and Pd is (900～1000) in described YSZ and the Pd mixed slurry: 1.
Described sheet metal is that grade of steel is the carbon steel thin plate of A3.
The preparation method of this motor exhaust catalytic converter, comprise and adopt back volume legal system to make metal beehive carrier, and coating active coating, described back volume method is earlier sheet metal to be comprised each step that applies active coating successively, before applying the active coating step, have successively hot-dip aluminizing, the differential arc oxidation step, roll the fastening again typing of honeycomb substrate later on.Its concrete steps be successively thin plate shearing, punching press, hot-dip aluminizing, oil removing, washing, differential arc oxidation, washing again, dry, apply active coating, roasting, roll honeycomb substrate and rivet is fixed.
Described hot-dip aluminizing is to adopt the salt bath legal system to be equipped with the hot-dip aluminizing sheet metal, adopt the heating of SG-3-12 type high-temperature crucibles electric furnace of resistance type, and with KSY type controllable silicon temperature controller control furnace temperature, aluminum melting crucible is a high-temperature ceramic copple, the grade of steel of cleaning surfaces is the flat sheet metal of A3 or rolls cellular sheet metal, immerse melt temperature and be 3min in 730 ℃ the liquid aluminium, a series of physics and chemical reaction take place at solid-state sheet metal and liquid aluminium interface, propose the back and in air, be cooled to room temperature, after cleaning the residual salt in aluminium plating membrane surface, form one deck aluminium lamination at surface of thin steel sheet and be goods, the thickness of aluminium plating membrane is 20 μ m, measures with the 0.01mm screw thread micrometer.Described liquid aluminium is the commercial-purity aluminium of purity＞99.7wt%, and fluxing agent is NaCl+Na
3AlF
6
Described differential arc oxidation is to adopt micro-arc oxidation process at hot-dip aluminizing surface of thin steel sheet growth in situ ceramic membrane, adopts the continuously adjustable three-phase half controlled bridge formula of voltage rectifier power source, and voltage is 400V～700V.Electrolytic bath is that stainless steel is made, be placed in the bosh, temperature with control electrolytic solution, electrolytic bath middle-jiao yang, function of the spleen and stomach is the hot-dip aluminizing sheet metal very, negative electrode is the stainless steel electrolytic groove, with the stepless speed regulation stirrer electrolyte solution is stirred in the differential arc oxidation process, so that electrolyte solution composition uniformity, the hot-dip aluminizing sheet metal is inserted electrolytic bath with temperature control and agitating function, connecting DC electrical source interacts the aluminum metal on the thin steel surface of hot-dip aluminizing and electrolyte solution, form micro-arc discharge growth in situ ceramic membrane on the surface, electrolyte solution is that the content ratio of sodium silicate and sodium hydroxide is 40: 1 a mixed solution, the electrolyte solution temperature is 20 ℃, and current density is 0.010A/cm
2～0.10A/cm
2
Described coating active coating is that YSZ and Pd are made into that the coating that contains catalyzer is coated on the catalyst carrier through excess temperature is that 700 ℃ of roastings form active coatings.
The preparation of described YSZ has following steps successively:
1) according to mol ratio Y: Zr=50: 50 take by weighing Y (NO
3) 36H
2O and Zr (NO
3) 45H
2O is a complexing agent with ammoniacal liquor, fully mixes, and heating-up temperature to 60 ℃, 20min stirs the mixture;
2) speed with 40/min adds ammoniacal liquor, impels to generate pale brown look gel precipitation, and the pH value is adjusted to 10, seals up for safekeeping behind the stirring 60min;
3) filter the precipitation that produces, water cyclic washing sludge, flush away ammoniacal liquor and nitrate;
4) heating-up temperature to 130 ℃ oven dry;
5) at 330 ℃ of following pre-burning 1.5h of temperature, again at 720 ℃ of following roasting 4h of temperature;
6) goods yttria-stabilized zirconia Y is taken out in the cooling back
0.5Zr
0.5O
2Powder.
The current density of this embodiment drops to 100A/m
2The time, every m
2The manufacturing expense of carbon steel ceramic coating formed by micro-arc oxidation is lower than 20 yuan of RMB, every price of carbon steel heat dip calorizing ceramic coating formed by micro-arc oxidation honeycomb substrate of φ 35 * 100 is at RMB below 6 yuan, and every price of FeCrAl metallic carrier of same model specification is 15 yuan～17 yuan of RMB.Sample detects every index and all reaches No. three emission standards in Europe through national motorcycle quality supervision and inspection center, the conversion ratio that is used for 4 stroke motorcycle satisfies: HC 〉=75%, CO 〉=80%, NOx 〉=30%, HC, CO, NOx and granular material discharged concentration satisfy the regulation of GB 14621, the decline of car load power performance was not more than 5% after catalytic converter was installed, and compare car load fixation noise with former car and can not surpass former car noise level, and the endurance test mileage reaches 10,000 kilometers.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (8)
1. motor vehicle exhaust catalytic converter, comprise carrier shell, place the catalyst carrier in the carrier shell, and the preceding deflector, the back deflector that place the catalyst carrier front and back respectively, described catalyst carrier is by the honeycomb substrate of the substrate of flat and the mutual coiling and molding of wavy wave support plate, it is characterized in that:
Described catalyst carrier is the metal beehive carrier that adopts ceramic coating formed by micro-arc oxidation technology to make as precursor with the hot-dip aluminizing sheet metal;
The catalyst coat that described catalyst carrier is uploaded is precious metal and rare earth composite catalyst coating, is with rare earth oxide Y
2O
3Make the yttria-stabilized zirconia ZrO of additive
2(YSZ) and palladium (Pd) be made into mixed slurry and be coated in the coating that forms on the catalyst carrier, the content ratio of YSZ and Pd is (800～1200) in described YSZ and the Pd mixed slurry: 1.
2. the preparation method of a motor vehicle exhaust catalytic converter, comprise and adopt first volume method or back volume legal system to make metal beehive carrier, and coating active coating, described first volume method is earlier sheet metal to be rolled the fastening again typing of honeycomb substrate, comprise later each step that applies active coating successively, described back volume method is earlier sheet metal to be comprised each step that applies active coating successively, rolls the fastening again typing of honeycomb substrate later on, it is characterized in that:
Before applying the active coating step, have successively hot-dip aluminizing, the differential arc oxidation step;
Described hot-dip aluminizing is to adopt the salt bath legal system to be equipped with the hot-dip aluminizing sheet metal, with flat sheet metal or roll cellular sheet metal, immerse melt temperature and be 1min～5min in 710 ℃～750 ℃ the liquid aluminium, be cooled to room temperature after the proposition, form aluminium lamination at surface of thin steel sheet and be goods;
Described differential arc oxidation is to adopt micro-arc oxidation process at hot-dip aluminizing surface of thin steel sheet growth in situ ceramic membrane, the hot-dip aluminizing sheet metal is inserted electrolytic bath with temperature control and agitating function, connect DC electrical source and form micro-arc discharge on the thin steel of hot-dip aluminizing surface, the growth in situ ceramic membrane, make amorphous oxide become the crystalline state phase, described electrolyte solution is the mixed solution of silicate and hydroxide, the content ratio of silicate and hydroxide is (10～75): 1, the electrolyte solution temperature is 10 ℃～45 ℃, and current density is 0.010A/cm
2～0.10A/cm
2, DC electrical source voltage is 400V～700V.
3. according to the preparation method of the described described motor vehicle exhaust catalytic converter of claim 2, it is characterized in that:
Described coating active coating is the compound coating of noble metal-coating and rare earth, is with rare earth oxide Y
2O
3Making the yttria-stabilized zirconia ZrO2 (YSZ) of additive and palladium (Pd) is made into mixed slurry and is coated in and forms active coating on the catalyst carrier.
4. according to the preparation method of claim 2 or 3 described described motor vehicle exhaust catalytic converters, it is characterized in that:
The preparation of described YSZ has following steps successively:
1) according to mol ratio Y: Zr=50: 50 take by weighing Y (NO
3) 36H
2O and Zr (NO
3) 45H
2O is a complexing agent with ammoniacal liquor, fully mixes, and heating-up temperature to 50 ℃～70 ℃, 15min～25min stirs the mixture;
2) speed with 30～50/min adds ammoniacal liquor, impels to generate pale brown look gel precipitation, and the pH value is adjusted to 9～12, seals up for safekeeping behind the stirring 60min;
3) filter the precipitation that produces, water cyclic washing sludge, flush away ammoniacal liquor and nitrate;
4) heating-up temperature to 110 ℃～150 ℃ of oven dry;
5) at 300 ℃～370 ℃ following pre-burning 1h～2h of temperature, again at 700 ℃～750 ℃ following roasting 3h～5h of temperature;
6) goods yttria-stabilized zirconia Y is taken out in the cooling back
0.5Zr
0.5O
2Powder.
5. according to the preparation method of claim 2 or 3 described described motor vehicle exhaust catalytic converters, it is characterized in that:
The thickness of described aluminium plating membrane is 10 μ m～30 μ m, measures with the 0.01mm screw thread micrometer.
6. according to the preparation method of the described described motor vehicle exhaust catalytic converter of claim 2, it is characterized in that:
Described liquid aluminium is the commercial-purity aluminium of purity＞99.7wt%, and fluxing agent is NaCl+Na
3AlF
6
7. according to the preparation method of claim 2 or 3 described described motor vehicle exhaust catalytic converters, it is characterized in that:
Described differential arc oxidation is a kind of in sodium silicate, potassium silicate, lithium metasilicate, the manganous silicate or two or more mixture arbitrarily with the silicate in the electrolyte solution;
Described differential arc oxidation is one or both a mixture in sodium hydroxide, the caustic potoash with the hydroxide in the electrolyte solution.
8. according to the preparation method of the described motor vehicle exhaust catalytic converter of claim 7, it is characterized in that:
Described differential arc oxidation electrolyte solution is the mixed solution of sodium silicate and sodium hydroxide, and the content ratio of sodium silicate and sodium hydroxide is (20～60): 1.
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| CNB2005100356017A CN100389247C (en) | 2005-07-06 | 2005-07-06 | Motor vehicle exhaust catalytic converter, and its preparing method |
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|---|---|---|---|
| CNB2005100356017A CN100389247C (en) | 2005-07-06 | 2005-07-06 | Motor vehicle exhaust catalytic converter, and its preparing method |
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| CN100389247C true CN100389247C (en) | 2008-05-21 |
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|---|---|---|---|---|
| JP2009156071A (en) * | 2007-12-25 | 2009-07-16 | Mitsubishi Motors Corp | Exhaust emission control device for internal combustion engine |
| CN102407129B (en) * | 2011-10-14 | 2013-05-29 | 上海交通大学 | High temperature resistant catalyst for low concentration methane combustion and preparation method thereof |
| JP5760152B2 (en) * | 2011-11-01 | 2015-08-05 | ビーエーエスエフ コーポレーション | System and method for manufacturing a honeycomb body |
| CN103774144B (en) * | 2014-03-03 | 2016-03-23 | 哈尔滨工业大学（威海） | A kind of metallic fiber sintered felt separation net and preparation method thereof |
| CN104941612B (en) * | 2015-06-05 | 2017-06-13 | 广东美的制冷设备有限公司 | A kind of adsorption catalyst and its preparation method and application and a kind of air purification method and its application |
| CN113844123A (en) * | 2021-09-18 | 2021-12-28 | 南通三多电子科技有限公司 | High-temperature honeycomb sandwich board and manufacturing method thereof |
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|---|---|
| CN1891989A (en) | 2007-01-10 |
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