CN110180539A - A kind of ternary catalyst for automobile tail gas coating material and its preparation process - Google Patents
A kind of ternary catalyst for automobile tail gas coating material and its preparation process Download PDFInfo
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- CN110180539A CN110180539A CN201910572051.4A CN201910572051A CN110180539A CN 110180539 A CN110180539 A CN 110180539A CN 201910572051 A CN201910572051 A CN 201910572051A CN 110180539 A CN110180539 A CN 110180539A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/656—Manganese, technetium or rhenium
- B01J23/6562—Manganese
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/101—Three-way catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a kind of ternary catalyst for automobile tail gas coating material and its preparation processes, belong to auto-exhaust catalyst field.Include the following steps: for cerium salt, manganese salt, dispersing agent, titanium tetrachloride and acidic silicasol to be add to deionized water stirring and dissolving, ammonium hydroxide neutralization is added to pH and obtains mixed liquor, filter cake is obtained by filtration；After filter cake is calcined, crush；Then smashed filter cake is configured to slurry with deionized water, and acid adding adjusts the viscosity of slurry；Pretreated cordierite carrier is immersed in slurry again, finally dry, roasting, cooling, acquisition three-way catalyst.The present invention refines catalyst fines particle by chemical synthesis, and particle is uniformly mixed, and crystallite dimension reaches nanoscale；Meanwhile the viscosity of slurry is adjusted by acid adding, carrier is improved to the adsorbance of coating；The antiwear property for solving existing three-way catalyst floating coat is poor, and thermal shock ability is poor, the problem of being easy to fall off.
Description
Technical field
The invention belongs to auto-exhaust catalyst field, especially a kind of ternary catalyst for automobile tail gas coating material and its
Preparation process.
Background technique
Automotive exhaust catalysis device is mainly made of active constituent, carrier, coating and auxiliary agent.Its core is with honeycomb ducts
The ceramic cylinder of structure, because ceramics are intolerant to colliding and shaking, so outside encapsulates iron-clad, interlayer is asbestos lining to play branch
Support and protective effect.Catalyst is just applied in the duct of ceramic monolith.Active constituent includes that noble metal, base metal and rare earth are mixed
Miscellaneous type catalyst etc., plays main catalytic action.Carrier is capable of providing active surface and suitable pore structure, obtains catalyst
Certain mechanical strength improves catalyst thermal stability, and most widely used at present is honeycomb ceramic carrier.Coating is claimed again
Make " Second support ", be attached to the surface of carrier, the specific surface area of carrier can be increased, generally use γ-AlO, under high temperature not
Stablize, it may occur that phase transformation is attached to the surface of carrier, increases the coating γ-Al of carrier2O3Reduce surface area by auxiliary agent for example some dilute
Native oxide etc., can be with the thermal stability of fortifying catalytic agent, to improve its service performance.
Wherein, catalyst is mainly made of noble metals such as Pt, Rh and Pd, and noble metal catalyst fruit is good, but higher cost.But
The non-precious metal catalysts such as calcium titanium-type oxide, common metal (Cu etc.), cost is relatively low, but catalytic performance can not show a candle to noble metal
Catalytic action.And with rear-earth-doped noble metal catalyst, noble metal dosage can be greatly reduced, not only reduce cost, simultaneously
Keep preferable catalytic effect.
It in the prior art, is to be realized by installing catalytic cleaner additional, and be catalyzed net to the control of motor vehicle exhaust emission
The key for changing device is catalyst.Catalyst generallys use three-decker and is made of active component, washcoat and carrier.One side
The catalytic performance of the noble metal catalyst of the existing one-component in face is bad, stability is poor, expensive, is not able to satisfy increasingly tight
High motor vehicle exhaust emission pollution；It on the other hand, is physical absorption, the absorption of coating between carrier due to three-way catalyst
Ability, antiwear property and thermal shock ability are poor, are easy to fall off.
Summary of the invention
Goal of the invention: a kind of ternary catalyst for automobile tail gas coating material and its preparation process are provided, urged with solving ternary
The adsorption capacity of the coating of agent, antiwear property and thermal shock ability are poor, the problem of being easy to fall off.
A kind of technical solution: preparation process of ternary catalyst for automobile tail gas coating material, comprising the following steps:
Cerium salt, manganese salt, dispersing agent are added sequentially in deionized water by S1, mass fraction, and titanium tetrachloride is added after stirring and dissolving
And acidic silicasol is added ammonium hydroxide neutralization to pH6.5 ~ 7.5 and obtains mixed liquor, filter, washing obtains filter cake after mixing evenly；
S2, by filter cake after 350 ~ 700 DEG C of 2 ~ 10h of calcining, it is cooling, crush；
S3, above-mentioned smashed powder are configured to slurry, acid adding or ammonium hydroxide with deionized water, and the apparent viscosity of slurry is adjusted to
8~15mPa·s；
S4, again by pretreated cordierite carrier immerse slurry in, then take out, and blow away slurry extra in duct, then
It dried, roasted；
S5, above-mentioned step 2 ~ 3 time S4 are repeated；Then carrier is immersed in palladium chloride ammonia solution, then takes out drying, roasts, is cold
But, three-way catalyst is obtained.
In a further embodiment, in the filter cake, titanium oxide accounts for 65 ~ 95%, and silica accounts for 5 ~ 20wt%, and cerium oxide accounts for
0.5 ~ 3wt%, manganese oxide account for 0.5 ~ 3wt%.
In a further embodiment, the cerium salt is one of cerium chloride, cerous nitrate, cerous acetate or a variety of.
In a further embodiment, the manganese salt is one of manganese chloride, manganese nitrate, manganese acetate or a variety of.
In a further embodiment, the dispersing agent is polyvinylpyrrolidone, polyethylene glycol, aliphatic alcohol polyethenoxy
One of ether is a variety of.
In a further embodiment, the acid is the one or more of them of hydrochloric acid, nitric acid, acetic acid.
The utility model has the advantages that passing through chemistry the present invention relates to a kind of preparation process of ternary catalyst for automobile tail gas coating material
Synthesis refines catalyst fines particle, and particle is uniformly mixed, and crystallite dimension reaches nanoscale；Meanwhile it being adjusted by acid adding
The viscosity of slurry improves carrier to the adsorbance of coating；The antiwear property for solving existing three-way catalyst floating coat is poor,
The problem of thermal shock ability is poor, is easy to fall off.
Detailed description of the invention
Fig. 1 is the TEM photo of 1 filter cake powder of the embodiment of the present invention
Fig. 2 is the grain size distribution of slurry obtained in the embodiment of the present invention 1 ~ 2.
Fig. 3 is the grain size distribution of slurry obtained in the embodiment of the present invention 3.
Fig. 4 is change curve of the slurry under different viscosities between load capacity and viscosity in the embodiment of the present invention 2.
Specific embodiment
In the following description, a large amount of concrete details are given so as to provide a more thorough understanding of the present invention.So
And it is obvious to the skilled person that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid confusion with the present invention, for some technical characteristics well known in the art not into
Row description.
Coating is attached to the surface of carrier also referred to as " Second support ", can increase the specific surface area of carrier, generally adopt
It is unstable under high temperature, it may occur that phase transformation is attached to the surface of carrier, and the coating γ-Al2O3 for increasing carrier makes surface with γ-AlO
Product reduces for example some rare earth oxides of auxiliary agent etc., can be with the thermal stability of fortifying catalytic agent, to improve its service performance.Tradition
It prepares ternary catalyst for automobile tail gas and generallys use dip coating, i.e., repeatedly impregnate carrier in various auxiliary agent slurry solution respectively.
In order to which the antiwear property for solving existing three-way catalyst floating coat is poor, thermal shock ability is poor, the problem of being easy to fall off,
It is further explored on the basis of existing infusion process, research influences slurry with the influence of three-way catalyst.
Embodiment 1
4.15g cerium chloride, 11.61g manganese acetate, 20ml polyethylene glycol (account for the volume that feeds intake 2%) are added sequentially to deionized water
In, addition 268.10g titanium tetrachloride and the acidic silicasol that 37.6g concentration is 30%, pH is 4, stir evenly after stirring and dissolving
Afterwards, ammonium hydroxide is added to neutralize to pH6.5 ~ 7.5, obtains mixed liquor, filter, washing obtains filter cake；By filter cake in 600 DEG C of calcining 4h
Afterwards, cooling, crush (titanium oxide wherein, is obtained by XRD analysis and accounts for 84wt%, cerium oxide accounts for 1.5wt%, and silica accounts for 12wt%,
Manganese oxide accounts for 2.5wt%).It is 30% slurry that above-mentioned smashed powder, which is configured to solid content with deionized water, at this time slurry viscosity
For 12mPas；Nitric acid is added, adjusts pH to 6.5, apparent viscosity of slurry is about 10mPas.It is again that pretreated violet is green
Stone carrier immerses in slurry, then about takes out after 1min, immerses 1min in slurry after drying again, then 130 °C of dry 3h, 600
°C roasting 2h, it is cooling；Then carrier is immersed in the palladium chloride ammonia solution of 1g/L, stirs 4h, then takes out, blown down extra molten
Liquid dries, cooling using 120 °C of dry 4h, 500 °C of roasting 2h, obtains the catalyst that palladium load capacity is 2g/L.
Embodiment 2
4.15g cerium chloride, 11.61g manganese acetate, 20ml polyethylene glycol (account for the volume that feeds intake 2%) are added sequentially to deionized water
In, addition 268.10g titanium tetrachloride and the acidic silicasol that 37.6g concentration is 30%, pH is 4, stir evenly after stirring and dissolving
Afterwards, ammonium hydroxide is added to neutralize to pH6.5 ~ 7.5, obtains mixed liquor, filter, washing obtains filter cake；By filter cake in 600 DEG C of calcining 4h
Afterwards, cooling, crush (titanium oxide wherein, is obtained by XRD analysis and accounts for 84wt%, cerium oxide accounts for 1.5wt%, and silica accounts for 12wt%,
Manganese oxide accounts for 2.5wt%).It is 30% slurry that above-mentioned smashed powder, which is configured to solid content with deionized water, and nitric acid is added, adjusts
PH to 4.0, apparent viscosity of slurry are about 40mPas.Pretreated cordierite carrier is immersed in slurry again, then about
It is taken out after 1min, immerses 1min in slurry after drying again, then 130 °C of dry 3h, 600 °C of roasting 2h, it is cooling；Then it will carry
Body immerses in the palladium chloride ammonia solution of 1g/L, stirs 4h, then takes out, and blows down redundant solution, dries, using 120 °C of dry 4h,
500 °C of roasting 2h, it is cooling, obtain the catalyst that palladium load capacity is 2g/L.
Embodiment 3
4.5g cerium oxide, 7.5g manganese oxide cerium powder are mixed by mass fraction, using the revolving speed of 200r/min, the ratio of grinding media to material of 10:1
Ball milling 20h adds 252.0g titanium oxide, 36.0g silica continuation Ball-milling Time 15h, obtains composite powder.It (wherein, aoxidizes
Titanium accounts for 84wt%, and cerium oxide accounts for 1.5wt%, and silica accounts for 12wt%, and manganese oxide accounts for 2.5wt%) then with deionized water by composite powder
End is configured to slurry, and slurry viscosity is 16mPas at this time；It is about 10mPas that ammonium hydroxide, which is added, and adjusts apparent viscosity of slurry.So
Pretreated cordierite carrier is immersed in slurry afterwards, then pretreated cordierite carrier is immersed in slurry, then about
It is taken out after 1min, immerses 1min in slurry after drying again, then 130 °C of dry 3h, 600 °C of roasting 2h, it is cooling；Then it will carry
Body immerses in the palladium chloride ammonia solution of 1g/L, stirs 4h, then takes out, and blows down redundant solution, dries, using 120 °C of dry 4h,
500 °C of roasting 2h, it is cooling, obtain the catalyst that palladium load capacity is 2g/L.
Embodiment 4
In embodiment 4,2.72g cerium chloride, 4.56g manganese acetate, 20ml polyethylene glycol (account for the volume that feeds intake 2%) are sequentially added
Into deionized water, addition 282.15g titanium tetrachloride and the acid silicon that 35.21g concentration is 30%, pH is 4 are molten after stirring and dissolving
Glue is added ammonium hydroxide and neutralizes to pH6.5 ~ 7.5, obtain mixed liquor, filter, washing obtains filter cake after mixing evenly；Filter cake is existed
Cooling after 600 DEG C of calcining 4h, crushing (wherein, obtains titanium oxide by XRD analysis and accounts for 90wt%, cerium oxide accounts for 1wt%, silica
8wt% is accounted for, manganese oxide accounts for 1wt%).Then composite powder is configured to slurry with deionized water, apparent viscosity of slurry is at this time
20mPa·s。
Remaining technological parameter is same as Example 1.
Embodiment 5
In embodiment 5,3.37g cerium chloride, 8.49g manganese acetate, 20ml polyethylene glycol (account for the volume that feeds intake 2%) are sequentially added
Into deionized water, addition 269.02g titanium tetrachloride and the acid silicon that 63.71g concentration is 30%, pH is 4 are molten after stirring and dissolving
Glue is added ammonium hydroxide and neutralizes to pH6.5 ~ 7.5, obtain mixed liquor, filter, washing obtains filter cake after mixing evenly；Filter cake is existed
It is cooling after 600 DEG C of calcining 4h, crush (wherein titanium oxide wherein, is obtained by XRD analysis and accounts for 83t%, cerium oxide accounts for 1.2wt%,
Silica accounts for 14wt%, and manganese oxide accounts for 1.8wt%).Then composite powder is configured to slurry with deionized water, slurry is apparent at this time
Viscosity is 15mPas.
Remaining technological parameter is same as Example 1.
The comprehensive performance of above-described embodiment 1 ~ 3 is detected, is had:
As shown in attached drawing 2 ~ 3, the grain size distribution for the slurry that physical grinding and superalloy two ways obtain.
As shown in Fig. 4, the slurry in embodiment 2 repeatedly impregnates, load capacity and slurry apparently glue under different viscosities
Change curve between degree.Wherein, load capacity=(the carrier loaded preceding weight of weight-after carrier loaded)/preceding weight of load ×
100%.Wherein, 1st curve is the load capacity change curve of the first dipping, and 2nd curve is that the load capacity variation of the second dipping is bent
Line, 3rd curve are the load capacity change curve of third dipping,
The bond strength between coating and carrier is detected with ultrasonic oscillation technology.Method particularly includes: 1, wear resistance: by sample
Product are placed in supersonic wave cleaning machine, and the concussion cleaning 30min under the power of 50W, drying, calculates ultrasonic cleaning coating at weighing
Loss late.2, thermal shock resistance properties: sample is placed in baking oven, in 450 DEG C of heat preservations 2h, 700 DEG C of heat preservation 6h, after cooling, weighing,
The loss late of coating after calculating thermal shock.Wherein coating loss rate.3, comprehensive performance: sample is placed in supersonic wave cleaning machine,
Concussion cleaning 30min, is subsequently placed in baking oven under the power of 50W, in 450 DEG C of heat preservations 2h, 700 DEG C of heat preservation 6h, after cooling, claims
Weight, the total loss rate for calculating coating.Wherein, loss late: φ=(W1-W2)/W0, wherein wherein W0For the weight of coating, W1For
The weight of carrier, W before handling2For the weight of carrier after processing.Specific experiment data are as follows:
By comparing above-mentioned experimental data, the grain size distribution for the slurry that comparison physical grinding and superalloy two ways obtain
It obtains, the coating granule of the slurry obtained described in superalloy is smaller, passes through the abrasion resistance of comparative example 1 and embodiment 3
Energy, thermal shock resistance properties and comprehensive performance, may further deduce, slurry inner coating grain diameter is smaller, is more conducive to carrying
It is adsorbed above body, and degree of absorption is more stable；From the slurry in embodiment 2 under different viscosities, repeatedly impregnate, load capacity
Change curve between apparent viscosity of slurry is available, and the apparent viscosity of slurry has larger impact to the load capacity of carrier,
Load capacity after especially impregnating for the first time.By comparative example 1 and embodiment 2, apparent viscosity and wear resistance, Re Chong
It is negatively correlated to hit performance and comprehensive performance etc., when this may be larger due to viscosity, the load capacity of carrier is bigger, earthquake and punching
It is easy to cause entirety to fall off during hitting, causes wear resistance, thermal shock resistance properties and comprehensive performance poor.Comparative example 1
With the data such as the apparent viscosity, wear resistance of slurry in embodiment 4 ~ 5, thermal shock resistance properties and comprehensive performance, can deduce
The partial size of pulp particle is minimum in embodiment 2 in embodiment 1, under this proportion, thinning effect, wear resistance, thermal shock
Performance and comprehensive performance etc. are best.
1 ~ 5 conclusion based on the above embodiments, the effect of embodiment 1 be it is best, using the method for superalloy, starched
Material, adjusts the apparent viscosity of slurry to 8 ~ 15mPas, at this point, the load capacity of carrier reaches 13% and wear-resistant loss late, heat
Rushing loss late and comprehensive loss rate can be lower than 12%.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
Claims (7)
1. a kind of preparation process of ternary catalyst for automobile tail gas coating material, which comprises the following steps:
Cerium salt, manganese salt, dispersing agent are added sequentially in deionized water by S1, mass fraction, and titanium tetrachloride is added after stirring and dissolving
And acidic silicasol is added ammonium hydroxide neutralization to pH6.5 ~ 7.5 and obtains mixed liquor, filter, washing obtains filter cake after mixing evenly；
S2, by filter cake after 350 ~ 700 DEG C of 2 ~ 10h of calcining, it is cooling, crush；
S3, above-mentioned smashed powder are configured to slurry, acid adding or ammonium hydroxide with deionized water, and the apparent viscosity of slurry is adjusted to
8~15mPa·s；
S4, again by pretreated cordierite carrier immerse slurry in, then take out, and blow away slurry extra in duct, then
It dried, roasted；
S5, above-mentioned step 2 ~ 3 time S4 are repeated；Then carrier is immersed in palladium chloride ammonia solution, then takes out drying, roasts, is cold
But, three-way catalyst is obtained.
2. the preparation process of ternary catalyst for automobile tail gas coating material according to claim 1, which is characterized in that described
In filter cake, titanium oxide accounts for 65 ~ 95wt%, and silica accounts for 5 ~ 20wt%, and cerium oxide accounts for 0.5 ~ 3wt%, and manganese oxide accounts for 0.5 ~ 3wt%.
3. the preparation process of ternary catalyst for automobile tail gas coating material according to claim 1, which is characterized in that described
Cerium salt is one of cerium chloride, cerous nitrate, cerous acetate or a variety of.
4. the preparation process of ternary catalyst for automobile tail gas coating material according to claim 1, which is characterized in that described
Manganese salt is one of manganese chloride, manganese nitrate, manganese acetate or a variety of.
5. the preparation process of ternary catalyst for automobile tail gas coating material according to claim 1, which is characterized in that described
Dispersing agent is one of polyvinylpyrrolidone, polyethylene glycol, fatty alcohol polyoxyethylene ether or a variety of.
6. the preparation process of ternary catalyst for automobile tail gas coating material according to claim 1, which is characterized in that described
Acid is the one or more of them of hydrochloric acid, nitric acid, acetic acid.
7. a kind of ternary catalyst for automobile tail gas coating material, which is characterized in that using any one of the claims 1 ~ 6 system
Standby three-way catalyst.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI741927B (en) * | 2020-12-31 | 2021-10-01 | 國立虎尾科技大學 | Preparation method of alpha-cordierite fluorescent powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI741927B (en) * | 2020-12-31 | 2021-10-01 | 國立虎尾科技大學 | Preparation method of alpha-cordierite fluorescent powder |
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