CN108927168A - A kind of natural gas vehicle three-way catalyst and preparation method thereof - Google Patents
A kind of natural gas vehicle three-way catalyst and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of natural gas vehicle three-way catalysts, the catalyst by carrier and coated on carrier prime coating and rear class coating form, the prime coating is two layers of catalyst coat of the coating A successively coated and coating B, and coating A is the γ-Al modified by nickel, manganese and neodymium2O3Coating, coating B are the γ-Als modified by cerium, zirconium, yttrium, praseodymium2O3The high concentration layer of precious metal of load, the rear class coating are by magnesium, calcium, barium, cobalt improved γ-Al2O3The low concentration layer of precious metal of load.Preparation process condition of the present invention is easy to control, practical.In addition, the present invention and traditional three-way catalyst difference are to coat using layering, classification, the catalytic activity of catalyst is improved；Effectively alleviate NOXIt is excessive rarefied for air-fuel ratio fluctuation and gaseous mixture for NO in decontamination processXThe inhibition of conversion realizes methane emission controls by improving combustion to greatest extent, while can activate Rh, it is made to show better NOXConversion capability.
Description
Technical field
The invention belongs to catalyst preparation technical fields, especially belong to natural gas purification catalyst preparation technical field, relate to
And a kind of natural gas vehicle three-way catalyst and preparation method thereof.
Background technique
Increasingly urgent with energy and environmental problem, in order to protect environment, energy saving, people are to motor-vehicle tail-gas
Emission control is put forward higher requirements.
China's natural gas resource uses natural gas to have quite as fuel compared with horn of plenty, relative to conventional gasoline, diesel oil
Considerable cost advantage, in addition natural gas can also be widely used in fuel for motor vehicle as a kind of sustainable development source in the future
In, natural gas is more and more used in motor vehicle fuel at present.Compared to traditional gasoline, diesel fuel, natural gas has more
Stable molecular structure, higher exhaust gas conversion initiation temperature, therefore, the vent gas treatment of natural gas vehicle also has higher difficulty
Degree, compared to traditional gasoline car three-way catalyst, using natural gas as the ignition way of fuel, when engines tail gas disposal, is past
Toward higher precious metal concentration is needed, cost pressure is larger.
Summary of the invention
The present invention in view of the deficiencies of the prior art, discloses a kind of natural gas vehicle three-way catalyst and preparation method thereof.
In order to solve the above technical problems, the technical scheme is that a kind of natural gas vehicle three-way catalyst, described to urge
Agent by carrier and coated on carrier prime coating and rear class coating form, the prime coating is the coating successively coated
Two layers of catalyst coat of A and coating B, coating A are the γ-Als modified by nickel, manganese and neodymium2O3Coating, coating B be by cerium,
Modified γ-the Al of zirconium, yttrium, praseodymium2O3The high concentration layer of precious metal of load, the rear class coating are by magnesium, calcium, barium, cobalt improved
γ-Al2O3The low concentration layer of precious metal of load.
Preferably, a kind of natural gas three-way catalyst, coating A in the prime coating by nickel, manganese and neodymium extremely
Few one kind is carried on γ-Al2O3Composition, wherein the weight percent loadings of nickel are 5%-15%, and the weight percent of manganese loads
Amount is 2%-10%, and the weight percent loadings of neodymium are 1%-5%.
Preferably, a kind of natural gas three-way catalyst, the coating B in the prime coating is changed by cerium, zirconium, lanthanum, yttrium, praseodymium
γ-the Al of property2O3Carried noble metal composition, wherein cerium, zirconium, lanthanum, yttrium, praseodymium weight percent dosage be 30-50%, in coating B
Noble metal is Pt-Pd or Pt-Pd-Rh, and it is 5:1-20:1 that wherein the ratio of Pt, Pd, which are the ratio of 1:1-1:10, Pt+Pd and Rh,
Precious metal concentration range is 40-150g/ft3。
Preferably, a kind of natural gas three-way catalyst, the rear class coating magnesium, calcium, barium, at least two loads in cobalt
In γ-Al2O3Composition, the weight percent of load are 5%-15%, and the noble metal of rear class coating load is Rh or Pd-Rh,
The ratio 0:1-5:1 of Pd-Rh, the concentration range 5g/ft3-15g/ft of noble metal3。
Preferably, a kind of natural gas and auto tail gas handles catalyst, the coated weight of the prime coating floating coat A are as follows:
The coated weight of 20-50g/L, prime coating floating coat B are 30-100g/L, and rear class coating coated weight is 80-150g/L.
Preferably, a kind of natural gas vehicle three-way catalyst, the carrier is cordierite ceramic or metal beehive carrier.
The invention also discloses a kind of above-mentioned natural gas vehicle three-way catalysts, and preparation method includes the following steps: institute
Catalyst components dosage is stated to prepare by any one of claim 1 to 5 dosage；
(1) it is formed according to the catalyst of above-mentioned prime coating, weighs the γ-Al of corresponding weight2O3Powder；
(2) required Mn, Ni salt is weighed according to above-mentioned coating A catalyst composition, suitable quantity of water is added, amount of water is (1)
Middle γ-Al2O30.8-1.0 times of water absorption is uniformly mixed；
(3) the weighed powder of step (1) is added in the solution of step (2)；It is stirred until homogeneous rapidly, standing time >=3
Hour, 80 DEG C are dried in vacuo 2 hours, and 600 DEG C are calcined 2 hours, obtain a kind of γ-Al that Mn, Ni are modified2O3Powder；
(4) suitable deionized water ball milling is added according to claim 5 in step (3) resulting powder and obtains prime
The slurry of coating A be coated on carrier on, through 120 DEG C forced air drying 20 minutes, 550 DEG C calcine 2 hours, obtain prime A coating and urge
Agent；
(5) it is formed according to the catalyst of above-mentioned coating B, weighs the γ-Al of corresponding weight2O3Powder；And according to step (2)
Mixing salt solution containing Ce, Zr, La, Pr, Y required for method is prepared；
(6) by the weighed γ-Al of step (5)2O3Powder and mixing salt solution stir evenly rapidly, standing time >=3 hour,
80 DEG C drying 8 hours, 550 DEG C are calcined 2 hours, and the modified γ-Al of a kind of Ce, Zr, La, Pr, Y is obtained2O3Powder；
(7) precious metals pd, Rh or Pd, Pt, Rh solution are weighed according to the requirement of coating B, suitable quantity of water is added, amount of water is
(6) γ-Al in2O30.8-1.0 times of water absorption is uniformly mixed；Standing time >=3 hour, 80 DEG C drying 2 hours, 550 DEG C are forged
It burns 2 hours, obtains the noble metal powder of coating B；
(8) appropriate amount of deionized water ball milling is added in the requirement according to claim 5 of step (7) resulting powder to obtain
The slurry of coating B；
(9) slurry of coating B is coated on step (4) obtained coating A, through 120 DEG C forced air drying 20 minutes, 550
DEG C calcining 2 hours, obtain the prime coating；
(10) it is formed according to the catalyst of above-mentioned rear class coating, weighs corresponding γ-Al2O3Powder；And according to step (2)
The mixing salt solution of Ca, Mg, Ba, Co required for method is prepared；
(11) by the weighed γ-Al of step (10)2O3Powder and mixing salt solution stir evenly rapidly, and standing time >=3 are small
When, 80 DEG C drying 8 hours, 550 DEG C are calcined 2 hours, and the modified γ-Al of a kind of Ca, Mg, Ba, Co is obtained2O3Powder；
(12) salting liquid of noble metal Rh or Pd, Rh are weighed according to the requirement of rear class coating, suitable quantity of water is added, and amount of water is
(10) γ-Al in2O30.8-1.0 times of water absorption is uniformly mixed；Standing time >=3 hour, 80 DEG C drying 2 hours, 550 DEG C are forged
It burns 2 hours, obtains the noble metal powder of rear class coating；
(13) appropriate amount of deionized water ball milling is added according to claim 5 in the resulting noble metal powder of step (12) to obtain
To the slurry of rear class coating；
(14) slurry of rear class coating is coated on carrier, through 120 DEG C forced air drying 20 minutes, 550 DEG C of calcinings are 2 small
When, obtain the rear class coating；
(15) above-mentioned catalyst coat when in use, can individually be coated on carrier, can also cooperate coated on carrier.
The present invention determines coating A, the coating B in prime coating when preparing the catalyst according to the design needs first
Coated weight and catalyst noble metal dosage；γ-the Al of coating A is determined according to the design needs2O3, Ni, Mn and Nd dosage,
Middle Mn, Nd and Ni are soluble-salt, such as nickel nitrate；The modification γ-of coating B is determined according to the noble metal dosage of catalyst
Al2O3And noble metal dosage.Catalyst of the present invention first coats A coating in coating, and after 550 DEG C of roastings are stablized, re-coating B is applied
Layer, its purpose is to allow layer of precious metal to separate with base metal layer, respectively plays catalytic action.According to the A's of coating and coating B
The raw emissions situation of the usage amount and engine of upper carrying capacity and noble metal determines the dosage of Ca, Mg, Ba, Co in rear class coating
And the usage amount ratio of ratio and noble metal.
By adopting the above-described technical solution, the invention has the following advantages: preparation process condition of the present invention is easily-controllable
System, it is practical.In addition, the present invention and traditional three-way catalyst difference are to coat using layering, classification, prime coating draws
Modified γ-the Al of Mn, Ni, Nd of stronger tail gas transfer capability is entered to have2O3Coating A and modified by cerium, zirconium, lanthanum, yttrium, praseodymium
γ-Al2O3The coating B of carried noble metal composition, improves the catalytic activity of catalyst；Rear class coating is that Ca, Mg, Ba, Co change
γ-the Al of property2O3The low concentration noble coatings of load, effectively alleviate NOXFor air-fuel ratio fluctuation in decontamination process
And gaseous mixture is excessive rarefied for NOXThe inhibition of conversion, air-fuel ratio can fluctuate in higher range in engine machine,
Methane emission controls by improving combustion is realized to greatest extent, while can activate Rh, it is made to show better NOXConversion capability.
Detailed description of the invention:
Fig. 1 is the CH4 conversion rate curve of present invention experiment detection.
Fig. 2 is the NOx conversion curve of present invention experiment detection.
Specific embodiment
The present invention is further described With reference to embodiment, and specific embodiment is to of the invention further
Illustrate, do not limit the invention in any way, same or like technology is without departing from the scope of protection of the invention with the present invention.
Reference Example:
Coated weight is 150g/l single coating catalyst preparation
Rhodium salting liquid and palladium salt solution (Pd1.377g, Rh0.153g) are weighed respectively, are added in 80g deionized water, stirring
Uniformly；By 98.35g cerium, zirconium, lanthanum, the modified γ-Al of yttrium2O3In powder addition rhodium, palladium mixing salt solution, place after mixing evenly rapidly
1 hour；Then it is dried in vacuo 8 hours for 80 DEG C, 550 DEG C are calcined 2 hours, and Pd-Rh/ γ-Al2O3 powder is obtained；By powder ball milling system
For at slurries, it is coated in hole mesh number 400cell/in2, in volume 2.5ml cordierite ceramic honeycomb carrier, dry coating weight is uploaded
Amount are as follows: 0.38g；Drying and roasting, as bullion content are 65g/ft3Palladium rhodium catalyst.
Embodiment 1:
Coating A coated weight in prime coating is 40g/L, and coating B is 80g/L；Rear class coating coated weight is 150g/L.
The preparation of catalyst:
Nickel nitrate (nickeliferous 5g), manganese nitrate (containing manganese 2g), neodymium nitrate (containing Nd0.5g) is weighed to be added in 80g deionized water,
It stirs evenly, it is spare to obtain salting liquid；By 95.00g γ-Al2O3Powder is added in nickel nitrate solution, and it is small to place 1 after mixing evenly rapidly
When；Then it is dried in vacuo 8 hours for 80 DEG C, 600 DEG C are calcined 2 hours, and Ni/ γ-Al is obtained2O3Powder；By Ni/ γ-Al2O3Powder ball
Mill preparation is coated in hole mesh number 400cell/in at slurries2, in volume 2.5ml cordierite ceramic honeycomb carrier, dry coating weight
Upper carrying capacity are as follows: 0.1g；After drying and roasting, coating A is obtained；Weigh respectively palladium salt, rhodium salting liquid (containing Pd2.542g and
Rh0.283g), it is added in 80g deionized water, stirs evenly, it is spare to obtain palladium rhodium salting liquid；Lanthanum, cerium, zirconium, yttrium, praseodymium is modified
77.2gγ-Al2O3Powder is added in palladium rhodium salting liquid, places 1 hour after mixing evenly rapidly；Then 80 DEG C of vacuum drying 8 are small
When, 550 DEG C roast 2 hours, obtain Pd-Pt/ γ-Al2O3 powder (for khaki powder)；Slurry is made in powder ball milling to be coated on
On coating A, carrying capacity on dry coating weight are as follows: 0.2g；Drying and roasting, as bullion content are 80g/ft3Palladium rhodium catalyst.
Magnesium nitrate (containing magnesium 0.5g), calcium nitrate (calcic 1g), cobalt nitrate (containing cobalt 1g), barium acetate (baric 3g) is weighed to be added
In 80g deionized water, stir evenly；By 94.5g γ-Al2O3Powder is added in solution, places 1 hour after mixing evenly rapidly；So
It is dried in vacuo 8 hours for 80 DEG C afterwards, 600 DEG C are calcined 2 hours, and modified γ-Al is obtained2O3Powder；Palladium salt is weighed respectively, rhodium salting liquid (contains
Palladium 0.296g, rhodium 0.059g) it is added in 80g deionized water, by modified γ-Al2O3Powder is added, then 80 DEG C of vacuum drying
8 hours, 600 DEG C were calcined 2 hours, obtained the γ-Al of modified load noble metal2O3Powder is added the preparation of deionized water ball milling and is slurried
Liquid is coated in hole mesh number 400cell/in2, in volume 2.5ml cordierite ceramic honeycomb carrier, carrying capacity on dry coating weight are as follows:
0.375g；After drying and roasting, back segment carrier coating, precious metal concentration 15g/ft are obtained3。
The above various types of materials, nitrate, acetate etc. are commercially available.
Embodiment 2, embodiment 3, embodiment 4 are identical as the preparation process of embodiment 1, only Mn, Ni in coating,
The load capacity of Nd, Mg, Ca, Ba, Co are different.Its list of ingredients is as follows:
| Number | Ni | Mn | Nd | Mg | Ca | Ba | Co |
| Embodiment 2 | 5% | 5% | 1% | 1% | 1% | 3% | 1% |
| Embodiment 3 | 5% | 10% | 1% | 0.5% | 0.5% | 5% | 2% |
| Embodiment 4 | 10% | 5% | 2% | 0.5% | 0.5% | 10% | 2% |
Testing result:
Catalyst in the above comparative example and embodiment is subjected to active evaluation test, experimental condition is as follows:
Simulate lean-combustion engine exhaust gas volume composition: methane: 1000ppm, carbon monoxide: 3000ppm, titanium dioxide
Carbon: 10%, nitric oxide: 1000ppm, oxygen: 3675ppm, nitrogen: Balance Air；Air speed: 60000h-1.
Table 1 is Reference Example or different embodiment catalyst CH4Activity data
Table 1
2 Reference Example of table or different embodiment catalyst n OXInitiation temperature
| Serial number | T50/℃ | T90/℃ |
| Reference Example | 294 | 354 |
| Embodiment 1 | 277 | 335 |
| Embodiment 2 | 281 | 342 |
| Embodiment 3 | 274 | 340 |
| Embodiment 4 | 276 | 338 |
It can be learnt from table 1,2:
Embodiment catalyst performance is superior to Reference Example.By the change of modifying element additive amount, noble metal dosage is reduced
In the case where, twin-stage, double coated catalysts performance performance be better than single coating, have lower CH4Initiation temperature and
Excessive oxygen concentration following table reveals better air-fuel ratio characteristic.
By changing the coated weight ratio of prime coating floating coat A and coating B and the coated weight of rear class coating, specific implementation
Under such as:
Embodiment 5:
It weighing nickel nitrate (nickeliferous 5g), manganese nitrate (containing manganese 2g), neodymium nitrate (containing Nd0.5g) are added in 80g deionized water,
It stirs evenly, it is spare to obtain mixed solution；By 92.5g γ-Al2O3Powder is added in mixing salt solution, places 1 after mixing evenly rapidly
Hour；Then it is dried in vacuo 8 hours for 80 DEG C, 600 DEG C are calcined 2 hours, and modified γ-Al is obtained2O3Powder；γ-Al2O3Powder ball milling
Slurries are prepared into, hole mesh number 400cell/in is coated in2, volume 2.5ml cordierite ceramic honeycomb carrier on, on dry coating weight
Carrying capacity are as follows: 0.125g.After drying and roasting, coating A is obtained；Weigh respectively palladium salt, rhodium salting liquid (containing Pd2.542g and
Rh0.283g), it is added in 80g deionized water, stirs evenly；By the modified 77.2g γ-Al of lanthanum, cerium, zirconium, yttrium, praseodymium2O3Powder adds
Enter in palladium rhodium solution, places 1 hour after mixing evenly rapidly；Then it is dried in vacuo 8 hours for 80 DEG C, 550 DEG C roast 2 hours, obtain
To Pd-Pt/ γ-Al2O3Powder (for khaki powder).Slurry is made in powder ball milling to be coated on coating A, on dry coating weight
Carrying capacity are as follows: 0.2g；Drying and roasting, prime coating B such as 1 noble metal-coating content of embodiment are 80g/ft3Palladium rhodium catalyst.
Rear class coating weighs magnesium nitrate (containing potassium 0.5g), calcium nitrate (calcic 1g) cobalt nitrate (containing cobalt 1g), barium acetate (baric
It 3g) is added in 80g deionized water, stirs evenly；By 94.5g γ-Al2O3Powder is added in solution, places 1 after mixing evenly rapidly
Hour；Then it is dried in vacuo 8 hours for 80 DEG C, 600 DEG C are calcined 2 hours, and modified γ-Al is obtained2O3Powder；Palladium salt, rhodium salt are weighed respectively
(0.296g containing palladium, rhodium 0.059g) solution is added in 80g deionized water, by modified γ-Al2O3Powder is added thereto, and then 80
DEG C vacuum drying 8 hours, 600 DEG C calcine 2 hours, obtain the γ-Al of modified load noble metal2O3Deionization water polo is added in powder
Mill preparation is coated in hole mesh number 400cell/in at slurries2, in the cordierite ceramic honeycomb carrier of volume 2.5ml, dry coating weight
Upper carrying capacity are as follows: 0.3g；After drying and roasting, rear class coating, precious metal concentration 15g/ft are obtained3。
Embodiment 6 is identical as the preparation process of embodiment 5, is only adjusted in coating A, the coated weight of coating B and ratio
Whole, noble metal total amount is identical in coating B；Rear class coating noble metal total amount is identical.Its list of ingredients is as follows:
| Serial number | Coating A coated weight | Coating B coated weight | Rear class coating coated weight |
| Embodiment 5 | 50g/L | 80g/L | 120g/L |
| Embodiment 6 | 50g/L | 100g/L | 100g/L |
Testing result:
Table 3 is the embodiment of different coated weights and ratio, NO under the conditions of CH4 initiation temperature and excess of oxygenXInitiation temperature
It can be learnt from table 3:
The performance of embodiment 5,6 is superior to comparative example, the good catalyst of available performance.
Fig. 1,2 are the data used in table 1,2,3 respectively, and the CH of the present invention experiment detection made4、 NOXConversion ratio
Curve.In figure, abscissa is temperature, unit: DEG C；Ordinate is conversion ratio, unit: %." 0 " is Reference Example catalyst performance in figure
Energy curve, " 1-6 " are respectively the catalyst performance curve for implementing 1- embodiment 6.
From Fig. 1,2 it can be concluded that, segmentation, classification coating, leading portion using bottom non-noble metal Ni, Mn, Nd element coating
A, upper layer coat high concentration layer of precious metal, and rear class coats the modified low concentration noble coatings of Ca, Mg, Ba, Co, CH4It is catalyzed oxygen
Change temperature T50, T90 temperature significantly lower than conventional monolayers catalyst and the usage amount of noble metal can be saved；Catalyst
Methane convert T90 at 422 DEG C hereinafter, and comparative example catalyst at 455 DEG C；And exist by comparing Reference Example and embodiment
NO under the conditions of excessive oxygenXInitiation temperature is converted, finds the NO of embodimentXInitiation temperature is significantly lower than Reference Example, in embodiment
The highest T50/T90 temperature spot of NOX conversion is 281/342 DEG C, hence it is evident that lower than 294/354 DEG C of Reference Example；This catalyst can be very
Good applies to the processing of chemically correct fuel natural gas and auto tail gas.
The equipment used in the present invention is the commonly used equipment of this field, and details are not described herein.
The foregoing is merely the schematical specific embodiment of the present invention, the range being not intended to limit the invention.It is any
Those skilled in the art, made equivalent changes and modifications under the premise of not departing from design and the principle of the present invention,
It should belong to the scope of protection of the invention.
Claims (7)
1. a kind of natural gas vehicle three-way catalyst, the catalyst is by carrier and coated in the prime coating and rear class on carrier
Coating composition, which is characterized in that the prime coating is two layers of catalyst coat of the coating A successively coated and coating B, coating A
It is the γ-Al modified by nickel, manganese and neodymium2O3Coating, coating B are the γ-Als modified by cerium, zirconium, yttrium, praseodymium2O3The height of load
Concentration layer of precious metal, the rear class coating are by magnesium, calcium, barium, cobalt improved γ-Al2O3The low concentration layer of precious metal of load.
2. a kind of natural gas three-way catalyst according to claim 1, it is characterised in that: in the prime coating
Coating A is carried on γ-Al by least one of nickel, manganese and neodymium2O3Composition, wherein the weight percent loadings of nickel are 5%-
15%, the weight percent loadings of manganese are 2%-10%, and the weight percent loadings of neodymium are 1%-5%.
3. a kind of natural gas three-way catalyst according to claim 1, it is characterised in that: the coating in the prime coating
γ-Al B modified by cerium, zirconium, lanthanum, yttrium, praseodymium2O3Carried noble metal forms, wherein the weight percent use of cerium, zirconium, lanthanum, yttrium, praseodymium
Amount is 30-50%, and noble metal is Pt-Pd or Pt-Pd-Rh in coating B, and wherein the ratio of Pt, Pd are 1:1-1:10, Pt+Pd and
The ratio of Rh is 5:1-20:1, and precious metal concentration range is 40-150g/ft3。
4. a kind of natural gas three-way catalyst according to claim 1, it is characterised in that: the rear class coating magnesium, calcium,
At least two in barium, cobalt are carried on γ-Al2O3Composition, the weight percent of load are 5%-15%, rear class coating load
Noble metal is Rh or Pd-Rh, the ratio 0:1-5:1 of Pd-Rh, the concentration range 5g/ft3-15g/ft of noble metal3。
5. a kind of natural gas and auto tail gas according to claim 1 handles catalyst, it is characterised in that: the prime coating
The coated weight of floating coat A are as follows: the coated weight of 20-50g/L, prime coating floating coat B are 30-100g/L, rear class coating coated weight
For 80-150g/L.
6. a kind of natural gas vehicle three-way catalyst according to claim 1, it is characterised in that: the carrier is cordierite
Ceramics or metal beehive carrier.
7. a kind of natural gas vehicle three-way catalyst described in any claim in -6 according to claim 1, which is characterized in that
Preparation method includes the following steps: the catalyst components dosage is quasi- by any one of claim 1 to 5 dosage
It is standby；
(1) it is formed according to the catalyst of above-mentioned prime coating, weighs the γ-Al of corresponding weight2O3Powder；
(2) required Mn, Ni salt is weighed according to above-mentioned coating A catalyst composition, suitable quantity of water is added, amount of water is γ-in (1)
Al2O30.8-1.0 times of water absorption is uniformly mixed；
(3) the weighed powder of step (1) is added in the solution of step (2)；It is stirred until homogeneous rapidly, standing time >=3 hour,
80 DEG C are dried in vacuo 2 hours, and 600 DEG C are calcined 2 hours, obtain a kind of γ-Al that Mn, Ni are modified2O3Powder；
(4) suitable deionized water ball milling is added according to claim 5 in step (3) resulting powder and obtains prime coating
The slurry of A be coated on carrier on, through 120 DEG C forced air drying 20 minutes, 550 DEG C calcine 2 hours, obtain prime A coated catalysts；
(5) it is formed according to the catalyst of above-mentioned coating B, weighs the γ-Al of corresponding weight2O3Powder；And according to the method for step (2)
Mixing salt solution containing Ce, Zr, La, Pr, Y required for preparing；
(6) by the weighed γ-Al of step (5)2O3Powder and mixing salt solution stir evenly rapidly, standing time >=3 hour, and 80 DEG C
8 hours dry, 550 DEG C are calcined 2 hours, obtain a kind of γ-Al that Ce, Zr, La, Pr, Y are modified2O3Powder；
(7) precious metals pd, Rh or Pd, Pt, Rh solution are weighed according to the requirement of coating B, suitable quantity of water is added, amount of water is in (6)
γ-Al2O30.8-1.0 times of water absorption is uniformly mixed；Standing time >=3 hour, 80 DEG C drying 2 hours, 550 DEG C of calcinings are 2 small
When, obtain the noble metal powder of coating B；
(8) appropriate amount of deionized water ball milling is added in the requirement according to claim 5 of step (7) resulting powder and obtains coating
The slurry of B；
(9) slurry of coating B is coated on step (4) obtained coating A, through 120 DEG C forced air drying 20 minutes, 550 DEG C are forged
It burns 2 hours, obtains the prime coating；
(10) it is formed according to the catalyst of above-mentioned rear class coating, weighs corresponding γ-Al2O3Powder；And according to the method for step (2)
The mixing salt solution of Ca, Mg, Ba, Co required for preparing；
(11) by the weighed γ-Al of step (10)2O3Powder and mixing salt solution stir evenly rapidly, standing time >=3 hour, and 80
DEG C dry 8 hours, 550 DEG C were calcined 2 hours, and a kind of γ-Al that Ca, Mg, Ba, Co are modified is obtained2O3Powder；
(12) salting liquid of noble metal Rh or Pd, Rh are weighed according to the requirement of rear class coating, suitable quantity of water is added, and amount of water is
(10) γ-Al in2O30.8-1.0 times of water absorption is uniformly mixed；Standing time >=3 hour, 80 DEG C drying 2 hours, 550 DEG C are forged
It burns 2 hours, obtains the noble metal powder of rear class coating；
(13) after the resulting noble metal powder of step (12) being obtained according to claim 5 addition appropriate amount of deionized water ball milling
The slurry of grade coating；
(14) by the slurry of rear class coating be coated on carrier on, through 120 DEG C forced air drying 20 minutes, 550 DEG C calcine 2 hours, obtain
The rear class coating；
(15) above-mentioned catalyst coat when in use, can individually be coated on carrier, can also cooperate coated on carrier.
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