CN101417244B - Coating method of motorcycle tail-gas catalyst metal carrier transition layer - Google Patents
Coating method of motorcycle tail-gas catalyst metal carrier transition layer Download PDFInfo
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- CN101417244B CN101417244B CN200810218986A CN200810218986A CN101417244B CN 101417244 B CN101417244 B CN 101417244B CN 200810218986 A CN200810218986 A CN 200810218986A CN 200810218986 A CN200810218986 A CN 200810218986A CN 101417244 B CN101417244 B CN 101417244B
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Abstract
The invention discloses a coating method of motorcycle tail gas catalyst metal carrier transition layer, comprising the following process steps: pre-processing of metal carrier: the metal carrier is washed by alkali and cleaned clearly by water, then baked in a high-temperature furnace and is cooled in the furnace; the preparation of the transition layer disposal liquid: pseudo-boehmite and magnesium nitrates with a certain quantity disposed by high temperature are weighed and a certain water and auxiliary agent are added and mixed with the pseudo-boehmite and magnesium nitrates; ball-grinding is carried out subsequently and the viscosity of the transition layer disposal liquid is adjusted finally; coating of the metal carrier transition layer: the preprocessed metal carrier is dipped in the transition layer disposal liquid; subsequently, the residual transition layer disposal liquid in the metal carrier is removed; and the metal carrier is dried and baked. The coating method can form a transition layer of a metal surface and a magnesia-alumina spinel aggregate and a Gama-Al2O3 transition layer, greatly reduces the expulsion rate of the active coating layer, and has simple process and high production efficiency.
Description
Technical field
The present invention relates to a kind of processing method of tail-gas catalyst metal carrier, especially a kind of painting method that is applied to the tail-gas catalyst metal carrier transition layer on the motorcycle.
Background technology
Along with people's growth in the living standard, motorcycle have become the vehicles that people go out and ride instead of walk, and especially in small and medium-sized cities, quantity sharply increases.When motorcycle brings convenience for people, but its discharge tail gas is but seriously influencing The Surroundings in Cities.In order to solve the problem of motorcycle exhaust exhaust emission, adopted tail gas catalyzed technology, two kinds of catalyst carriers are arranged at present, a kind of is ceramic monolith, another kind is a metallic carrier.Comparatively speaking, the tail gas catalyzing unit that adopts metallic carrier to make has that initiation temperature is low, purifying rate is high, disposal ability is big, exhaust back pressure is little, vibration resistance is strong and characteristics such as catalyst life is long, thereby is widely used in motorcycle tail gas cleaning.In the preparation process of catalyst converter, need the just active coat of catalyst be attached to the surface of metallic carrier, but before active coat applies, generally also need carry out the transition zone coating processing of metallic carrier.Existing comparatively general transition layer disposal liquid preparation method has two kinds, and the one, with γ-Al
2O
3With the rare-earth oxide mixing and ball milling, the 2nd, make MgAI earlier
2O
4Presoma again with γ-Al
2O
3With the rare-earth oxide mixing and ball milling.The transition zone painting method of metallic carrier is then: metallic carrier is at high temperature heated, make its surface form Modification on Al
2O
3, metal carrier surface is better combined with transition zone, then transition layer disposal liquid is coated to metal carrier surface and roasting.But form Modification on Al through heat
2O
3At the metal carrier surface skewness; And above-mentioned two kinds of transition zones that method obtained and metal carrier surface adhesion neither be very strong, and therefore final metallic carrier and active coating adhesion still are poor, are prone to cause coating shedding; Especially Tail Pipe Temperature is higher in the motorcycle driving process; Coating shedding is more serious, thereby reduces the purifying rate of catalytic converter, is even no purifying rate.
Summary of the invention
The painting method that the purpose of this invention is to provide a kind of motorcycle tail-gas catalyst metal carrier transition layer, forming with the magnesium aluminate spinel at metal carrier surface is the MgAL of aggregate
2O
4-γ-AL
2O
3Transition zone effectively increases the adhesion of metallic carrier and active coat, reduce active coat expulsion rate greatly, and technology is simple, and production efficiency is high.
The present invention realizes above-mentioned purpose like this:
The painting method of motorcycle tail-gas catalyst metal carrier transition layer, forming with the magnesium aluminate spinel at metal carrier surface is the MgAL of aggregate
2O
4-γ-AL
2O
3Transition zone comprises following processing step:
A. metallic carrier preliminary treatment: the alkali cleaning of metallic carrier elder generation, water are rinsed well, put into the high temperature kiln roasting, cool off with stove then;
B. the preparation of transition layer disposal liquid: take by weighing a certain amount of boehmite and magnesium nitrate through high-temperature process, add a certain amount of water and auxiliary agent and stir, ball milling is then adjusted the viscosity of transition layer disposal liquid at last;
C. the coating of metal carrier transition layer: will immerse in the transition layer disposal liquid through pretreated metallic carrier, and take out and remove transition layer disposal liquid unnecessary in the metallic carrier then, with metallic carrier oven dry and roasting.
As the improvement of technique scheme, in the metallic carrier pre-treatment step, also need be after the roasting cooling with certain density solution soaking 1～2 minute and the oven dry that contains magnesium compound.
Wherein, the temperature of roasting is 800～1000 ℃ in the metallic carrier preliminary treatment, and roasting time is 4～6 hours.
The painting method of motorcycle tail-gas catalyst metal carrier, forming with the magnesium aluminate spinel at metal carrier surface is the MgAL of aggregate
2O
4-γ-AL
2O
3Transition zone comprises following processing step:
Wherein, the adding ratio of said boehmite and magnesium nitrate is: 19: 1～19: 5.
Wherein, the said ball milling time is 1～3 hour, and the average grain diameter that makes acquisition is less than 10 μ m.
Wherein, said transition layer disposal liquid viscosity method of adjustment is to add nitric acid, and the adjustment pH value is 2～5.
Wherein, the time of metallic carrier immersion transition layer disposal liquid is 1～2 minute.
Wherein, the sintering temperature of the metallic carrier after the coating is 700～900 ℃, and roasting time is 2～4 hours.
The invention has the beneficial effects as follows: above-mentioned painting method can form with magnesium aluminate spinel MgAL at metal carrier surface
2O
4MgAL for aggregate
2O
4-γ-AL
2O
3Transition zone is because MgAL
2O
4Saturated structures make it that higher heat endurance and intensity arranged, the MgAL that is evenly distributed simultaneously
2O
4Played skeleton function, the one deck that evenly distributes in the metal surface contains the Mg compound can form spinelles such as magnalium, iron magnesium with the metal surface, improved the adhesion of metal and transition zone more.And on this transition zone, apply active coat, and can increase the adhesion of metallic carrier and active coat, and transition zone has higher firmness and hear resistance, reduce active coat expulsion rate greatly, and technology is simple, the production efficiency height.Form MgAL in addition
2O
4Amount is appropriate, so transition zone still has bigger specific area, helps active coating and applies.
The specific embodiment
The painting method of motorcycle tail-gas catalyst metal carrier comprises following processing step:
A. metallic carrier preliminary treatment: the alkali cleaning of metallic carrier elder generation, water are rinsed well, can effectively be removed the dirt of metal carrier surface.Put into the high temperature kiln roasting to metallic carrier then, sintering temperature is 800～1000 ℃, and roasting time 4～6 hours with the stove cooling, through roasting, forms AL on the surface of metallic carrier
2O
3, favourable metallic carrier combines with transition zone.
In order further to increase the binding ability of metallic carrier and transition zone, after the roasting cooling, also need contain the solution soaking 1～2 minute of magnesium compound and dry with certain density, can form the compound of one deck magnesium like this at metal carrier surface, make can with MgAL
2O
4-γ-AL
2O
3Transition zone better combines.
B. the preparation of transition layer disposal liquid: take by weighing a certain amount of boehmite and magnesium nitrate through high-temperature process; The weight ratio of boehmite and magnesium nitrate is 19: 1～19: 5; Adding a certain amount of water and auxiliary agent stirs; Ball milling then, the ball milling time is 1～3 hour, the average grain diameter that makes acquisition is less than 10 μ m.At last for the viscosity of adjusting transition layer disposal liquid so that the coating of metallic carrier, adding nitric acid adjustment pH value is about 2～5, with control viscosity to 30～60C.P.
C. the coating of metallic carrier: will immerse in the active transition layer treatment fluid through pretreated metallic carrier; The immersion time is 1～2 minute; Take out and remove active transition layer treatment fluid unnecessary in the metallic carrier then; With metallic carrier oven dry and roasting, burning temperature is 700～900 ℃, and roasting time is 2～4 hours.
Above-mentioned painting method can form with magnesium aluminate spinel MgAL at metal carrier surface
2O
4MgAL for aggregate
2O
4-γ-AL
2O
3Transition zone is because MgAL
2O
4Saturated structures make it that higher heat endurance and intensity arranged, the MgAL that is evenly distributed simultaneously
2O
4Played skeleton function, the one deck that evenly distributes in the metal surface contains the Mg compound can form spinelles such as magnalium, iron magnesium with the metal surface, improved the adhesion of metal and transition zone more.And on this transition zone, apply active coat, and can increase the adhesion of metallic carrier and active coat, and transition zone has higher firmness and hear resistance, reduce active coat expulsion rate greatly, and technology is simple, the production efficiency height.
Form MgAL in addition
2O
4Amount is appropriate, so transition zone still has bigger specific area, helps active coating and applies.
Below by ultrasonic impact test, comparative illustration prior art and difference of the present invention.Process of the test is that the metallic carrier that is coated with active coat is put into ultrasonic washing instrument, uses 300W power to clean 20 minutes.
1. be coated with the result of the test of the motorcycle catalyst of transition zone through ultrasonic impact.
2. use the result of the test of the motorcycle catalyst of prior art acquisition through ultrasonic impact.
| The sample sequence number | The former weight g of carrier | Carrier gain in weight g | The 1st sharp water g | The 2nd sharp water g | The 3rd sharp water g | Expulsion rate % |
| 1 | 52.364 | 53.681 | 53.643 | 53.632 | 53.63 | 3.87 |
| 2 | 52.419 | 53.641 | 53.6 | 53.58 | 53.578 | 5.16 |
| 3 | 53.121 | 54.559 | 54.501 | 54.498 | 54.497 | 4.31 |
It is visible to contrast above-mentioned data, and the transition zone that the present invention obtained can increase the adhesion of metallic carrier and active coat, and transition zone has higher firmness and hear resistance, reduces active coat expulsion rate greatly.
Claims (8)
1. the painting method of motorcycle tail-gas catalyst metal carrier transition layer is the MgAl of aggregate in metal carrier surface formation with the magnesium aluminate spinel
2O
4-γ-Al
2O
3Transition zone comprises following processing step:
A. metallic carrier preliminary treatment: the alkali cleaning of metallic carrier elder generation, water are rinsed well, put into the high temperature kiln roasting, cool off with stove then;
B. the preparation of transition layer disposal liquid: take by weighing a certain amount of boehmite and magnesium nitrate through high-temperature process, add a certain amount of water and auxiliary agent and stir, ball milling is then adjusted the viscosity of transition layer disposal liquid at last;
C. the coating of metal carrier transition layer: will immerse in the transition layer disposal liquid through pretreated metallic carrier, and take out and remove transition layer disposal liquid unnecessary in the metallic carrier then, with metallic carrier oven dry and roasting.
2. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1 is characterized in that: in the metallic carrier pre-treatment step, after the roasting cooling, also need also dry in 1～2 minute with the certain density solution soaking that contains magnesium compound.
3. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1, it is characterized in that: the temperature of roasting is 800～1000 ℃ in the metallic carrier preliminary treatment, roasting time is 4～6 hours.
4. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1, it is characterized in that: the adding weight ratio of said boehmite and magnesium nitrate is: 19: 1～19: 5.
5. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1 is characterized in that: said transition layer disposal liquid viscosity method of adjustment is to add nitric acid, and adjustment pH value is 2～5.
6. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1, it is characterized in that: the said ball milling time is 1～3 hour, the average grain diameter that makes acquisition is less than 10 μ m.
7. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1 is characterized in that: the time that metallic carrier immerses transition layer disposal liquid is 1～2 minute.
8. the painting method of motorcycle tail-gas catalyst metal carrier transition layer according to claim 1, it is characterized in that: the sintering temperature of the metallic carrier after the coating is 700～900 ℃, roasting time is 2～4 hours.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810218986A CN101417244B (en) | 2008-11-10 | 2008-11-10 | Coating method of motorcycle tail-gas catalyst metal carrier transition layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810218986A CN101417244B (en) | 2008-11-10 | 2008-11-10 | Coating method of motorcycle tail-gas catalyst metal carrier transition layer |
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| CN101417244A CN101417244A (en) | 2009-04-29 |
| CN101417244B true CN101417244B (en) | 2012-09-26 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513131B (en) * | 2011-12-09 | 2013-09-11 | 十堰市登喜路实业有限公司 | Catalyst for purification of tail gas produced by military diesel offroad vehicle and coating method thereof |
| CN102784667B (en) * | 2012-09-05 | 2014-06-18 | 重庆辉虎催化剂有限公司 | Transition layer for surface treatment of catalyst for motorcycles and coating method of transition layer |
| CN105344353B (en) * | 2015-11-03 | 2017-11-24 | 中国第一汽车股份有限公司 | A kind of preparation method of mutually chimeric nitrogen oxides reduction carrier coating |
| CN105903496B (en) * | 2016-04-19 | 2018-05-22 | 中国科学院宁波材料技术与工程研究所 | The painting method of catalyst and the carbon soot particles filter prepared using this method |
| CN112844381B (en) * | 2021-02-01 | 2021-12-14 | 四川大学 | Magnesium aluminate spinel modified Pt-based automobile exhaust catalyst, preparation method and application |
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