CN105233820A - High-stability catalyst for purifying tail gas of gasoline car and preparation method thereof - Google Patents
High-stability catalyst for purifying tail gas of gasoline car and preparation method thereof Download PDFInfo
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- CN105233820A CN105233820A CN201510739050.6A CN201510739050A CN105233820A CN 105233820 A CN105233820 A CN 105233820A CN 201510739050 A CN201510739050 A CN 201510739050A CN 105233820 A CN105233820 A CN 105233820A
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Abstract
The invention relates to a high-stability catalyst for purifying the tail gas of a gasoline car and a preparation method thereof. The catalyst comprises a carrier and an active coating, wherein the active coating comprises a rare earth composite oxide, modified aluminum oxide, a binding agent, an additive and an active component, wherein the additive is one or more of polymethacrylates, polyisobutylene, ethylene propylene copolymer and hydroxyethyl cellulose. The preparation method comprises the steps of: (1) preparing an additive solution; (2) preparing a first-class coating sizing agent; (3) preparing a second-class coating sizing agent; (4) preparing a precursor of a catalyst sizing agent; (5) preparing the catalyst sizing agent; and (6) coating the carrier. According to the high-stability catalyst and the preparation method thereof disclosed by the invention, the problems that in the conventional size mixing technology, the stability of the sizing agent is poor, the acid consumption of a low-concentration sizing agent is large, and the sizing agent is easy to generate precipitates, so that the consistency of the nature of an upper-layer sizing agent and the nature of a lower-layer sizing agent is poor, are solved; the stability of the obtained sizing agent is improved, the cost of the obtained sizing agent is low, the low-concentration sizing agent cannot generate the precipitates, and the consistency of the sizing agent is good.
Description
Technical field
The present invention relates to a kind of tail-gas from gasoline automobiles purification high stability Catalysts and its preparation method, belong to tail-gas from gasoline automobiles purification techniques field.
Background technology
In recent years, along with developing rapidly of urban construction and communication, vehicles number increases rapidly year by year.While automobile offers convenience to the trip of people, following vehicle exhaust causes huge pollution to atmospheric environment.Current people isolate 100 many kinds of substances from vehicle exhaust, wherein kind more than 80 is harmful substance, mainly comprises: carbon monoxide, hydrocarbon, nitrogen oxide, carbon dioxide, smokeshade (containing some heavy metal compound, lead compound, black smoke and mist of oil), foul smell (containing formaldehyde etc.).According to statistics, every thousand automobiles are discharged carbon monoxide and be about 3000kg, hydrocarbon 200 ~ 400kg, nitrogen oxide 50 ~ 150kg every days.Vehicle exhaust is one of main source becoming atmosphere pollution.At present, arrangement for catalytic purification all installed by the car that the country in the U.S. and Europe produces, and is provided with the car of three-way catalytic converter more than 90% in worldwide.On the Chinese side, along with the fast development of automobile industry and the progressively enhancing of environmental consciousness, the catalytic conversion technique of motor vehicle exhaust emission is more and more subject to the people's attention.Tail-gas from gasoline automobiles cleaning catalyst generally comprises carrier, active coating two parts.Traditional easy layering of catalyst coat slurry, precipitation, and coating coating intensity is general.In order to meet stricter Abgasgesetz, need the stability and the intensity that improve active coating, this just has higher requirement to the stability of our catalyst coat slurry.
The patent No. is that the patent of invention of CN103084176B discloses a kind of diesel car tail gas refining dual oxide type Catalysts and its preparation method, comprise the front grade carrier and rear grade carrier that axially set gradually along engine exhaust port, described front grade carrier is arranged near engine exhaust port, described rear grade carrier is arranged away from engine exhaust port, described front grade carrier is coated with prime coating, described rear grade carrier is coated with rear class coating, carrying capacity on effective increase active coating, overcome coating shedding, and coating uniform, there is obvious catalytic activity, effectively can realize diesel car tail gas refining.But in actual use, the effect of catalysis is undesirable all the time.
Summary of the invention
An object of the present invention is to provide a kind of tail-gas from gasoline automobiles to purify high stability catalyst, solve traditional size mixing technology, Stability of Slurry is poor, and low concentration slurry acid consumption is large, and easily there is precipitation in slurry, makes the defect of its levels slurry properties uniformity difference; The Stability of Slurry obtained improves, and with low cost, and low concentration slurry there will not be precipitation, and sizing agent consistency is good.
For achieving the above object, the present invention adopts following technical scheme: a kind of tail-gas from gasoline automobiles purification high stability catalyst, comprise carrier and active coating, described active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, binding agent, additive and active component; Described additive is one or more in polymethacrylates, polyisobutene, ethylene propylene copolymer, hydroxyethylcellulose; Described active component is the mixture of a kind of in palladium, rhodium or two kinds, and the presoma of described palladium and rhodium is respectively palladium nitrate and rhodium nitrate.
Repeatedly repeatedly testing detect delay through applicant to catalyst, find that existing catalyst effect is poor, is that easily occur precipitation, the uniformity of slurry is poor, uneven, easily comes off because the poor stability of slurry.Technique scheme is by adding a kind of new material additive, control the stability of slurry, break a traditional thinking of sizing mixing with acid, solve traditional size mixing technology, Stability of Slurry is poor, and low concentration slurry acid consumption is large, and easily there is precipitation in slurry, makes the defect of its levels slurry properties uniformity difference.After adding new additive agent, compared with traditional size mixing technology, Stability of Slurry improves, and with low cost, and technique is simple, and low concentration slurry there will not be precipitation, and sizing agent consistency is good.Can realize the immersion coating repeatedly of carrier, can effectively increase carrying capacity on active coating, overcome coating shedding, and gradation coating composition uniformity is good, homogeneity of product is high.Because coating is more even, stable, this catalyst has obvious catalytic activity, effectively can realize tail-gas from gasoline automobiles purification.
As preferably, the principal component of described complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; The mol ratio of cerium, zirconium is 1:5 ~ 1:1, and the quality of the oxide of lanthanum is 3% ~ 5% of described complex rare-earth oxidate containing valuable metal, and the quality of the oxide of praseodymium is 3% ~ 5% of described complex rare-earth oxidate containing valuable metal.
As preferably, described complex rare-earth oxidate containing valuable metal is by cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate and precipitating reagent are reacted gained.
As preferably, described precipitating reagent is one or more mixtures in ammoniacal liquor, ammonium carbonate, carbonic hydroammonium.
As preferably, described binding agent is one or both the mixture in boehmite, aluminum nitrate.
As preferably, the viscosity of described additive is 2000 ~ 6000mPas.
An object of the present invention is the preparation method in order to provide above-mentioned catalyst, adopts following technical scheme:
A preparation method for tail-gas from gasoline automobiles purification high stability catalyst, comprises following step:
(1) deionized water is joined in additive, 30 ~ 80
oheat 10 ~ 60min under C, be stirred to and dissolve completely, obtain additive solution; The content of described additive is 0.1% ~ 2%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, grind with sand mill after stirring; Active component presoma is often risen 1.0 ~ 2.1g add, stir; Obtain one-level coating paste; The granularity of described one-level coating paste is 5 ~ 15 μm;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal and binding agent, grind with sand mill after stirring; Active component presoma is added by often liter of 0.2 ~ 1.0g, stirs, obtain secondary coating paste; The granularity of described secondary coating paste is 5 ~ 15 μm;
(4) additive solution prepared in a certain amount of step (1) is added in secondary coating paste, stir 4 ~ 8h, obtain catalyst pulp precursor; The proportioning of described additive solution and described secondary coating paste meets additive is step (3) middle rare earth composite oxides 0 ~ 2%;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 1 ~ 5h; Add water adjusting slurry solid content to 22% ~ 31%, obtains catalyst pulp;
(6) carrier is immersed in the catalyst pulp of step (5) gained, take out the carrier of the full catalyst pulp of leaching, blow away additional size, obtain the carrier that surface has active coating after flash baking, roasting, i.e. catalyst.
This preparation method is simple, and noble metal, by different precious metal concentration, is separated load on different carriers material by step (2), (3), inhibits the migration of noble metal in pyroprocess to sinter, substantially increases the stability of slurry.
As preferably, the upper carrying capacity of described active coating is 150 ~ 200g/L.
As preferably, described in step (6), carrier is before entering described catalyst pulp, is first immersed in one-level coating paste or secondary coating paste, after taking out oven dry, roasting, obtain catalyst precarsor, make the gain in weight of catalyst precarsor reach 60 ~ 80g/L; Again catalysis is added precursor and enter into the catalyst pulp immersing step (5) gained, take out the carrier of the full catalyst pulp of leaching, blow away additional size, after flash baking, roasting, obtain catalyst.
As preferably, the temperature of drying in step (6) is 150 DEG C; The technique of roasting is elder generation roasting 0.5 ~ 1h, then roasting 2 ~ 3h under 500 ~ 600 DEG C of conditions under 300 ~ 400 DEG C of conditions.
By implementing technique scheme, the present invention adds additive in catalyst pulp, control the stability of slurry, between raw material in additive and catalyst, amalgamation is good, compared with the technique adopting acid to size mixing with tradition, catalyst pulp stability improves, and it is with low cost, technique is simple, catalyst pulp there will not be precipitation, sizing agent consistency is good, without layering and deposited phenomenon, higher with the adhesion strength of carrier, the uniformity of coating is better, improve the clean-up effect of catalyst to tail-gas from gasoline automobiles, this catalyst has obvious catalytic activity, effectively can realize tail-gas from gasoline automobiles purification, by simple technological process, preparation good evenness, active high catalyst pulp, and realize efficiently being combined between catalyst pulp with carrier, carrying capacity on effective increase active coating, overcomes coating shedding, and gradation coating composition uniformity is good, homogeneity of product is high, and coating is more even, stable.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.
Special instruction, is below only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Embodiment 1:
A kind of tail-gas from gasoline automobiles purification high stability catalyst, comprise carrier and active coating, said carrier can be ceramic monolith, and can be also metallic carrier, the present embodiment selects cordierite honeycomb ceramic.Active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, binding agent, additive and active component.The principal component of complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; Adopt Co deposited synthesis: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are mixed, adding precipitating reagent under agitation to the pH of solution is 9.0, reaction terminates rear ageing 4, by the composite oxides presoma that obtains after filtration, after washing, dry for 110 DEG C and also after 550 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal.Each component is 1:5 by the mol ratio of cerium, zirconium, and the quality of the oxide of lanthanum is 3% of described complex rare-earth oxidate containing valuable metal, and the quality of the oxide of praseodymium is that 3% of described complex rare-earth oxidate containing valuable metal adds.Wherein, precipitating reagent is the mixture of ammoniacal liquor and ammonium carbonate.Modified aluminas is the γ Al of La modification
2o
3.Binding agent is boehmite; Additive is the mixture of polymethacrylates, polyisobutene, ethylene propylene copolymer, and viscosity is 2000mPas.Active component is two noble metal systems of palladium and rhodium two kinds mixing composition, and the presoma of palladium and rhodium is respectively palladium nitrate and rhodium nitrate.
Concrete preparation process comprises:
(1) deionized water is joined in additive, 80
oheat 10min under C, be stirred to and dissolve completely, obtain additive solution; The content of described additive is 0.1%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, grind with sand mill after stirring; Active component presoma is added by 1.0g in often liter of active coating, stirs; Obtain one-level coating paste; The granularity of described one-level coating paste is 10 μm; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal, modified aluminas is 1:0.1:0.05, and the consumption of binding agent is 6% of active coating cumulative volume;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal and binding agent, grind with sand mill after stirring; Active component presoma is added by 1.0g in often liter of active coating, stirs, obtain secondary coating paste; The granularity of described secondary coating paste is 5 ~ 10 μm; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal is 1:0.5, and the consumption of binding agent is 3% of active coating cumulative volume;
(4) additive solution prepared in a certain amount of step (1) is added in secondary coating paste, stir 4h, obtain catalyst pulp precursor; The volume proportion of described additive solution and described secondary coating paste meets additive solution is step (3) middle rare earth composite oxides 0.1 ~ 2%;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 3h; Add water adjusting slurry solid content to 25%, obtains catalyst pulp;
(6) carrier is immersed in the catalyst pulp of step (5) gained, take out the carrier of the full catalyst pulp of leaching, blow away additional size, flash baking under 100 DEG C of conditions, immerse again in catalyst pulp, again and blow away additional size, oven dry, repeat until the upper carrying capacity of catalyst pulp reaches 180g/L, then roasting 1h under 300 DEG C of conditions, then roasting 3h under 500 DEG C of conditions, obtains catalyst after roasting.
Embodiment 2:
A kind of tail-gas from gasoline automobiles purification high stability catalyst, comprise carrier and active coating, said carrier can be ceramic monolith, and can be also metallic carrier, the present embodiment selects cordierite honeycomb ceramic.Active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, binding agent, additive and active component.The principal component of complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; Adopt Co deposited synthesis: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are mixed, adding precipitating reagent under agitation to the pH of solution is 9.5, reaction terminates rear ageing 3h, by the composite oxides presoma that obtains after filtration, after washing, dry for 110 DEG C and also after 550 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal.Each component is 1:3 by the mol ratio of cerium, zirconium, and the quality of the oxide of lanthanum is 5% of described complex rare-earth oxidate containing valuable metal, and the quality of the oxide of praseodymium is that 4% of described complex rare-earth oxidate containing valuable metal adds.Wherein, precipitating reagent is ammoniacal liquor.Binding agent is aluminum nitrate; Additive is polymethacrylates, and viscosity is 4000mPas.Active component is palladium, and palladium presoma is palladium nitrate.
Concrete preparation process comprises:
(1) deionized water is joined in additive, 30
oheat 60min under C, be stirred to and dissolve completely, obtain additive solution; The content of described additive is 1%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, grind with sand mill after stirring; Active component presoma is added by 2.1g in often liter of active coating, stirs; Obtain one-level coating paste; The granularity of described one-level coating paste is 10 ~ 15 μm; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal, modified aluminas is 1:0.5:0.1, and the consumption of binding agent is 10% of active coating cumulative volume;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal and binding agent, grind with sand mill after stirring; Active component presoma is added by 1.5g in often liter of active coating, stirs, obtain secondary coating paste; The granularity of described secondary coating paste is 10 ~ 15 μm; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal is 1:0.1, and the consumption of binding agent is 5% of active coating cumulative volume;
(4) additive solution prepared in a certain amount of step (1) is added in secondary coating paste, stir 5h, obtain catalyst pulp precursor; The volume proportion of described additive solution and described secondary coating paste meets additive solution is step (3) middle rare earth composite oxides 2%;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 5h; Add water adjusting slurry solid content to 31%, obtains catalyst pulp;
(6) carrier is immersed in the catalyst pulp of step (5) gained, take out the carrier of the full catalyst pulp of leaching, blow away additional size, flash baking under 150 DEG C of conditions, repeat until the upper carrying capacity of catalyst pulp reaches 200g/L, then roasting 0.5h under 400 DEG C of conditions, then roasting 2h under 600 DEG C of conditions, obtains catalyst after obtaining catalyst roasting after roasting.
Embodiment 3:
A kind of tail-gas from gasoline automobiles purification high stability catalyst, comprise carrier and active coating, said carrier can be ceramic monolith, and can be also metallic carrier, the present embodiment selects metallic carrier.Active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, binding agent, additive and active component.The principal component of complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; Adopt Co deposited synthesis: at ambient temperature, cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate are mixed, adding precipitating reagent under agitation to the pH of solution is 10.0, reaction terminates rear ageing 6h, by the composite oxides presoma that obtains after filtration, after washing, dry for 110 DEG C and also after 550 DEG C of roastings, obtain complex rare-earth oxidate containing valuable metal.Each component is 1:1 by the mol ratio of cerium, zirconium, and the quality of the oxide of lanthanum is 4% of described complex rare-earth oxidate containing valuable metal, and the quality of the oxide of praseodymium is that 5% of described complex rare-earth oxidate containing valuable metal adds.Wherein, precipitating reagent is carbonic hydroammonium.Binding agent is the mixture of boehmite and aluminum nitrate; Additive is the mixture of polyisobutene, ethylene propylene copolymer, hydroxyethylcellulose three, and viscosity is 6000mPas.Active component is rhodium, and its presoma is rhodium nitrate.
Concrete preparation process comprises:
(1) deionized water is joined in additive, 60
oheat 40min under C, be stirred to and dissolve completely, obtain additive solution; The content of described additive is 2%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, grind with sand mill after stirring; Active component presoma is added by 1.6g in often liter of active coating, stirs; Obtain one-level coating paste; The granularity of described one-level coating paste is 5 μm; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal, modified aluminas is 1:0.3:0.4, and the consumption of binding agent is 8% of active coating cumulative volume;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal and binding agent, grind with sand mill after stirring; Active component presoma is added by 2.1g in often liter of active coating, stirs, obtain secondary coating paste; The granularity of described secondary coating paste is 5 μm; The mass ratio of deionized water and complex rare-earth oxidate containing valuable metal is 1:0.2, and the consumption of binding agent is 2% of active coating cumulative volume;
(4) additive solution prepared in a certain amount of step (1) is added in secondary coating paste, stir 8h, obtain catalyst pulp precursor; The volume proportion of described additive solution and described secondary coating paste meets additive solution is step (3) middle rare earth composite oxides 1%;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 1h; Add water adjusting slurry solid content to 22%, obtains catalyst pulp;
(6) be immersed in by carrier in one-level coating paste or secondary coating paste, the present embodiment selects one-level coating paste, takes out 200 DEG C of oven dry, immerse again, dry, after roasting, until the gain in weight of carrier reaches 60 ~ 80g/L, the present embodiment is 65g/L, obtains catalyst precarsor; Again catalyst precarsor is immersed in the catalyst pulp of step (5) gained, take out the carrier of the full catalyst pulp of leaching, blow away additional size, flash baking under 200 DEG C of conditions, then immerse, dry, until the upper carrying capacity of catalyst pulp reaches 150g/L,, then roasting 0.8h under 360 DEG C of conditions, then roasting 2.5h under 550 DEG C of conditions, obtain catalyst after roasting, after roasting, obtain catalyst.
Embodiment 4:
Be from the different of embodiment 1: in active coating, add transition metal oxide, have the stability of catalyst and improve more significantly, with additive with the use of, adding more separately additive effect will get well, the adhesion property also resulting improvement of catalyst pulp and carrier; Addition is 0.01 ~ 0.1% of rare earth oxide amount.That transition metal oxide is selected is NiO, Fe
2o
3, Co
2o
3in one or more mixtures, be preferably NiO and Fe
2o
3mixing, NiO and Co
2o
3mixing, the present embodiment adopt NiO and Co
2o
3mixture, mass mixing ratio is 1:0.1 ~ 0.5, and the present embodiment is preferably 1:0.5.
Embodiment 5:
Be from the different of embodiment 1: add rare earth oxide auxiliary agent in active coating, addition is 0.01 ~ 0.1% of rare earth oxide and modified aluminas total amount.Rare earth oxide selection of auxiliary be La
2o
3, Nd
2o
3, CeO
2in one or more, preferred plan is used alone, and the present embodiment selects La
2o
3.
Claims (10)
1. a tail-gas from gasoline automobiles purification high stability catalyst, comprises carrier and active coating, it is characterized in that: described active coating comprises complex rare-earth oxidate containing valuable metal, modified aluminas, binding agent, additive and active component; Described additive is one or more in polymethacrylates, polyisobutene, ethylene propylene copolymer, hydroxyethylcellulose; Described active component is the mixture of a kind of in palladium, rhodium or two kinds, and the presoma of described palladium and rhodium is respectively palladium nitrate and rhodium nitrate.
2. a kind of tail-gas from gasoline automobiles purifies high stability catalyst according to claim 1, it is characterized in that: the principal component of described complex rare-earth oxidate containing valuable metal is the oxide of cerium, zirconium, lanthanum, praseodymium; The mol ratio of cerium, zirconium is 1:5 ~ 1:1, and the quality of the oxide of lanthanum is 3% ~ 5% of described complex rare-earth oxidate containing valuable metal, and the quality of the oxide of praseodymium is 3% ~ 5% of described complex rare-earth oxidate containing valuable metal.
3. a kind of tail-gas from gasoline automobiles purifies high stability catalyst according to claim 2, it is characterized in that: described complex rare-earth oxidate containing valuable metal is by cerous nitrate, zirconyl nitrate, lanthanum nitrate, praseodymium nitrate and precipitating reagent are reacted gained.
4. a kind of tail-gas from gasoline automobiles purifies high stability catalyst according to claim 3, it is characterized in that: described precipitating reagent is one or more mixtures in ammoniacal liquor, ammonium carbonate, carbonic hydroammonium.
5. a kind of tail-gas from gasoline automobiles purifies high stability catalyst according to claim 1, it is characterized in that: described binding agent is one or both the mixture in boehmite, aluminum nitrate.
6. a kind of tail-gas from gasoline automobiles purifies high stability catalyst according to claim 1, it is characterized in that: the viscosity of described additive is 2000 ~ 6000mPas.
7. a kind of tail-gas from gasoline automobiles purifies the preparation method of high stability catalyst as claimed in claim 1, it is characterized in that: comprise following step:
(1) deionized water is joined in additive, 30 ~ 80
oheat 10 ~ 60min under C, be stirred to and dissolve completely, obtain additive solution; The content of described additive is 0.1% ~ 2%;
(2) deionized water is joined in complex rare-earth oxidate containing valuable metal, modified aluminas and binding agent, grind with sand mill after stirring; Active component presoma is added, stirs; Obtain one-level coating paste; The granularity of described one-level coating paste is 5 ~ 15 μm;
(3) deionized water is joined in complex rare-earth oxidate containing valuable metal and binding agent, grind with sand mill after stirring; Active component presoma is added, stirs, obtain secondary coating paste; The granularity of described secondary coating paste is 5 ~ 15 μm;
(4) additive solution prepared in step (1) is added in secondary coating paste, stir 4 ~ 8h, obtain catalyst pulp precursor; The volume proportion of described additive solution and described secondary coating paste meets additive is step (3) middle rare earth composite oxides 0.1 ~ 2%;
(5) described one-level coating paste is mixed with the described catalyst pulp precursor in step (4), stir 1 ~ 5h; Add water adjusting slurry solid content to 22% ~ 31%, obtains catalyst pulp;
(6) carrier is immersed in the catalyst pulp of step (5) gained, take out the carrier of the full catalyst pulp of leaching, blow away additional size, after flash baking, roasting, obtain catalyst.
8. a kind of tail-gas from gasoline automobiles purifies the preparation method of high stability catalyst according to claim 7, it is characterized in that: the carrier gain in weight after application of described catalyst reaches 150 ~ 200g/L.
9. a kind of tail-gas from gasoline automobiles purifies the preparation method of high stability catalyst according to claim 8, it is characterized in that: described in step (6), carrier is before entering described catalyst pulp, first be immersed in one-level coating paste or secondary coating paste, after taking out oven dry, roasting, obtain catalyst precarsor, make the gain in weight of catalyst precarsor reach 60 ~ 80g/L; Again catalyst precarsor is immersed in the catalyst pulp of step (5) gained, takes out the carrier of the full catalyst pulp of leaching, blow away additional size, after flash baking, roasting, obtain catalyst.
10. a kind of tail-gas from gasoline automobiles purifies the preparation method of high stability catalyst according to claim 7, it is characterized in that: the temperature of drying in step (6) is 100 ~ 200 DEG C; The technique of roasting is elder generation roasting 0.5 ~ 1h, then roasting 2 ~ 3h under 500 ~ 600 DEG C of conditions under 300 ~ 400 DEG C of conditions.
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| CN106076331B (en) * | 2016-06-22 | 2018-06-19 | 无锡威孚环保催化剂有限公司 | A kind of preparation method of three-way catalyst |
| CN107537745A (en) * | 2017-07-14 | 2018-01-05 | 中国第汽车股份有限公司 | A kind of painting method for improving wall-flow particulate filter catalyst coatings catalytic activity |
| CN111167436A (en) * | 2019-12-06 | 2020-05-19 | 清华大学 | Coated monolithic catalyst and preparation method and application thereof |
| CN111957312A (en) * | 2020-08-21 | 2020-11-20 | 包头稀土研究院 | Catalyst for motor vehicle tail gas and preparation method and application thereof |
| CN111974390A (en) * | 2020-08-21 | 2020-11-24 | 包头稀土研究院 | Catalyst for tail gas of diesel vehicle, preparation process and application |
| CN111957312B (en) * | 2020-08-21 | 2023-03-14 | 包头稀土研究院 | Catalyst for motor vehicle tail gas and preparation method and application thereof |
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Application publication date: 20160113 |