CN105728026B - Diesel vehicle platinum base oxidative catalyst and preparation method thereof - Google Patents
Diesel vehicle platinum base oxidative catalyst and preparation method thereof Download PDFInfo
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- CN105728026B CN105728026B CN201610077387.XA CN201610077387A CN105728026B CN 105728026 B CN105728026 B CN 105728026B CN 201610077387 A CN201610077387 A CN 201610077387A CN 105728026 B CN105728026 B CN 105728026B
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/78—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J29/7815—Zeolite Beta
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0244—Coatings comprising several layers
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0246—Coatings comprising a zeolite
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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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
Abstract
The present invention relates to a kind of diesel vehicle platinum base oxidative catalyst and preparation method thereof, including carrier, contact layer is coated on carrier, outer layer slurry layer is coated on contact layer, contact layer is aluminium oxide slurry layer, and the coated weight of contact layer is 30 ~ 50g/L, and the coated weight of outer layer slurry layer is 90 ~ 100g/L.Preparation method of the present invention is simple, step is easily operated, silicon aluminium oxide is mixed in outer layer slurry layer as dispersing agent, ammonium tungstate is thermostabilization auxiliary agent, and molecular sieve is the storage material of low temperature HC, can be improved HC under low temperature and adsorbs, zirconium glue caking agent is added, acid can play the role of fixed noble metal, and to prevent noble metal migration, manganese nitrate solution finally is added after noble metal is fixed.Addition ammonium tungstate and manganese nitrate are passed through using catalyst prepared by the present invention, preferable ignition effect is obtained in the case where noble metal additive amount is less, HC and CO low temperature light-off performance is preferable, and endurance quality is more preferable, the production cost for reducing catalyst improves the competitiveness of oxidative catalyst.
Description
Technical field
The present invention relates to a kind of diesel vehicle platinum base oxidative catalysts and preparation method thereof, belong to catalyst preparation technology neck
Domain.
Background technique
Tail gas pollution of motor-driven vehicle has become one of main source of atmosphere pollution.In city most NOX, CO, HC and
PM is generated by motor-vehicle tail-gas, and NOx and PM the discharge specific gravity of especially diesel vehicle are maximum.These pollutants are not only to people
Body causes to damage and can generate photochemical fog under certain conditions, keeps vegetation dead, the environment of human survival is by tight
It destroys again.The beginning of this year, four emission regulation of diesel vehicle state is formal in China to be implemented, it is contemplated that will be implemented more within 2018
Stringent five regulation of state.Therefore, to the catalytic conversion efficiency of diesel vehicle oxidative catalyst, higher requirements are also raised.
Solubility of the diesel vehicle oxidative catalyst (DOC) in CO, NO, HC and PM in the tail gas of oxidated diesel oil vehicle has
Machine ingredient (SOF), coating is mainly made of oxide carrier and active noble metal constituent, and noble metal is oxidative catalyst
Key component.For diesel vehicle DOC, the chemistry of HC, CO and SOF in diesel engine vent gas etc. can be exactly reduced using DOC
The activation energy of reaction enables these substances to carry out oxidation reaction at a lower temperature with the oxygen in tail gas, be converted into CO2 and
H2O；Oxidation catalyst loads oxide coating and active metal group usually using ceramic honey comb or honeycomb as carrier thereon
Point, common noble metal component is Pt, Pd etc..Exhaust gas from diesel vehicle post-processing is widely used expensive before four emission regulation of state at present
Metal is Pt.
The existing diesel vehicle oxidative catalyst of four discharge phase of state catalyst low temperature ignition, thermal endurance, in terms of
There are problems, and cryogenic property is not good enough, and the decline of aging catalyst performance is obvious, and coating bullion content is at high cost greatly.
Summary of the invention
The purpose of the present invention is to solve the above problems, provide a kind of simple diesel vehicle platinum base oxidation of preparation method
Property catalyst and preparation method thereof, the catalyst being prepared has better HC and CO low temperature light-off performance, and durability is more preferable.
The present invention adopts the following technical scheme: a kind of diesel vehicle platinum base oxidative catalyst, including carrier, the carrier are
Cordierite honeycomb ceramic is coated with contact layer on the carrier, is coated with outer layer slurry layer, the contact layer on the contact layer
For aluminium oxide, the coated weight of the contact layer is 30~50g/L, and the outer layer slurry layer is sial composite oxides, described outer
The amount of precious metals pt is 15~60g/ft in layer slurry layer3, the coated weight of the outer layer slurry layer is 90~100g/L.
The preparation method of diesel vehicle platinum base oxidative catalyst, includes the following steps:
The River Bank Stability of contact layer and coating
(1) preparation of contact layer slurries: by weight 0.9~0.96:0.04~0.1 by Al2O3It is separately added into zirconium acetate
It into deionized water, stirs and slurries is made, dust technology is added and adjusts slurries pH less than 4.5；
(2) slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 250~380 turns/
Point, runing time is 3~6h, and serous granule degree to D90 is 2~20um；
(3) in contact layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 550~600 DEG C of horses
Not kiln roasting 10-20min is cooled to room temperature, and weighs its powder quality, with the quality divided by 10g, just obtains slurry solid content；
(4) it the coating of contact layer: is coated with quantitatively coating special plane, catalyst carrier is placed at application chamber, is pressed
It is that the solid content that 30~50g/L is required and measured calculates the wet weight gain of target according to coated weight, the slurries calculated is added to slurry
In disk, quantitative coating is carried out, contact layer slurries are coated on carrier surface；
(5) drying of contact layer slurries: the catalyst coated passes through 100~150 DEG C of flash bakings, drying time 3
~6h falls the water evaporation in coating；
(6) roasting of contact layer slurries: drying rear catalyst is put into Muffle furnace, and 450~550 DEG C of 1~2h of roasting are protected
It is cooled to room temperature after temperature, weighs catalyst weight；
The River Bank Stability of outer layer slurry layer and coating
(7) outer layer River Bank Stability: by weight 0.695~0.88:0.1~0.25:0.01~0.03:0.01~0.025
Sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent are add to deionized water, stirred；
(8) ball milling of outer layer slurries: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 250~
380 revs/min, runing time is 3~6h, and serous granule degree to D90 is 2~20um；
(9) in outer layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 550~600 DEG C of Muffles
10~20min of kiln roasting, is cooled to room temperature, and weighs its powder quality, with the quality divided by 10g, just obtains slurry solid content；
(10) in outer layer slurries precious metal solution addition: by noble metal [Pt (NH3)4](OH)2Solution is slowly added into ball
In slurries after mill, 2~5h is stirred, until active component precious metals pt solution is thoroughly dispersed in slurries；
(11) outer layer slurries pH adjust: dust technology is slowly added into noble metal slurries, adjust the pH to 4.5 of slurries with
Under；
(12) doping of manganese: a certain amount of manganese nitrate is slowly added dropwise in outer layer slurries for realizing the doping of manganese element；
(13) outer layer slurry coating coats: being coated with quantitatively coating special plane, catalyst carrier is placed in application chamber
Place is that the solid content that 90~100g/L is required and measured calculates the wet weight gain of target according to coated weight, the slurries calculated is added
Into slurry disk, quantitative coating is carried out, on the contact layer by the coating of outer coating slurries；
(14) outer layer slurries are dried: the catalyst coated passes through 100~150 DEG C of flash bakings, and drying time is 3~6h
Water evaporation in coating is fallen；
(15) outer layer slurries roast: drying rear catalyst being put into Muffle furnace, 450~550 DEG C of 1~2h of roasting, heat preservation
After be cooled to room temperature, weigh catalyst weight.
Further, the mass percent of silicon is 1.5~5% in the sial composite oxides in the step (8), remaining
For aluminum oxide.
Further, the doping of the manganese in the step (12) is indicated with manganese oxide, and the quality of manganese oxide is outer layer slurry
The 1~3% of powder quality after liquid roasting.
Preparation method of the present invention is simple, and step is easily operated, and contact layer and outer layer slurry layer, outer layer are successively coated on carrier
Silicon aluminium oxide is mixed in slurry layer as dispersing agent, ammonium tungstate is added in powder as auxiliary agent, the thermal stability of coating can be improved,
Enhance the endurance quality of catalyst, and catalyst surface acidic site can be enhanced, be conducive to the generation of reduction-state platinum, improves catalyst
Activity, molecular sieve is low temperature HC storage material, improve the absorption of HC under low temperature, while the fixed noble metal of a small amount of acid is added,
To prevent noble metal migration, be finally added manganese nitrate solution after noble metal is fixed, the doping of manganese to CO ignition and NO oxidation have compared with
Good facilitation, it is less in noble metal additive amount using catalyst prepared by the present invention by addition ammonium tungstate and manganese nitrate
In the case where obtain preferable ignition effect, there is better HC and CO low temperature light-off performance, and endurance quality is more preferable, lowers
The production cost of catalyst, improves the competitiveness of oxidative catalyst.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated.
Being all made of diameter in three examples below is 80mm, and the cylindrical cordierite ceramic honey comb of a height of 60mm is carrier,
Volume is 0.301L, and vehicle weight 97g, the concentration of precious metals pt is the [Pt (NH of 0.1191g (noble metal)/g (liquid)3)4]
(OH)2Solution.
Embodiment one: the preparation method of diesel vehicle platinum base oxidative catalyst includes the following steps:
Contact layer River Bank Stability and coating
(1) preparation of contact layer slurries: by Al2O3, zirconium acetate by weight being add to deionized water for 0.96:0.04,
It stirs, it is 4.45 that nitric acid, which is added, and adjusts slurries pH；
(2) contact layer slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 250 turns/
Point, runing time 6h, serous granule degree to D90 is 15.3um；
(3) in contact layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 550 DEG C of Muffle furnaces
20min is roasted, is cooled to room temperature, weighing its powder quality is 2.81g, and with the quality divided by 10g, just obtaining slurry solid content is
28.1%；
(4) contact layer coats: it is coated with quantitatively coating special plane, catalyst carrier is placed at application chamber, according to
Coated weight is that the wet weight gain of solid content calculating target slurry that 30g/L is required and measured is 32.1g, and load weighted slurries are added to
In slurry disk, quantitative coating is carried out, contact layer slurries are coated on carrier surface, practical coating slurry weight is 33.2g；
(5) contact layer is dried: the catalyst coated passes through 100 DEG C of flash bakings, and drying time 6h will be in coating
Water evaporation is fallen；
(6) contact layer roasts: drying rear catalyst being put into Muffle furnace, 450 DEG C of roasting 2h are cooled to after heat preservation
Room temperature, weighing catalyst weight are 106.2g；
External coating River Bank Stability and coating
(7) preparation of outer layer slurries: sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent are pressed in proportion
Weight ratio is add to deionized water for 0.71:0.25:0.02:0.02, stirs；
(8) outer layer slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 250 turns/
Point, runing time 6h, serous granule degree to D90 is 13.8um；
(9) in outer layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 550 DEG C of Muffle furnaces and is roasted
20min is burnt, is cooled to room temperature, weighing its powder quality is 3.25g, with the quality divided by 10g, just obtains slurry solid content
32.5%；
(10) in outer layer slurries precious metal solution addition: take ball milling rear slurry 1000g, precious metals pt additional amount is 60g/
ft3, coated weight 100g/L, the amount for calculating precious metals pt is 6.88g, and the amount for weighing precious metals pt solution is
57.82g in the slurries after precious metal solution to be slowly added into ball milling, stirs 5h, until active component noble metal is thoroughly dispersed in
In slurries, the amount of added noble metal is 60/ft3；
(11) outer layer slurries pH is adjusted: dust technology being slowly added into noble metal slurries, the pH to 4.45 of slurries is adjusted；
(12) doping of manganese: being slowly added dropwise a certain amount of manganese nitrate in outer layer slurries for realizing the doping of manganese element,
The doping of manganese indicates that the quality of manganese oxide is 1% of powder quality after outer layer slurries roast with manganese oxide；
(13) outer layer slurry layer coats: being coated with quantitatively coating special plane, catalyst carrier be placed at application chamber,
According to coated weight be 100g/L requirement and the wet weight gain of solid content calculating target measured is 94g, and load weighted slurries are added to
In slurry disk, quantitative coating is carried out, outer coating slurries are coated on contact layer coating, practical coating slurry weight is
94.8g
(14) outer layer slurry layer is dried: the catalyst coated passes through 100 DEG C of flash bakings, and drying time 6h will be applied
Water evaporation in layer is fallen；
(15) outer layer slurry layer roasts: drying rear catalyst being put into Muffle furnace, 450 DEG C of roasting 2h are cold after heat preservation
But to room temperature, weighing catalyst weight is 137.1g.
Embodiment two: the preparation method of diesel vehicle platinum base oxidative catalyst includes the following steps:
Contact layer River Bank Stability and coating
(1) preparation of contact layer slurries: in proportion by Al2O3, zirconium acetate be add to deionized water, weight ratio 0.93:
0.07, it stirs, it is 4.43 that nitric acid, which is added, and adjusts slurries PH；
(2) contact layer slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 320 turns/
Point, runing time 4h, serous granule degree to D90 is 12.3um；
(3) in contact layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 580 DEG C of Muffle furnaces
20min is roasted, is cooled to room temperature, weighing its powder quality is 2.78g, and with the quality divided by 10g, just obtaining slurry solid content is
27.8%；
(4) contact layer coats: it is coated with quantitatively coating special plane, catalyst carrier is placed at application chamber, according to
Coated weight is that the wet weight gain of solid content calculating target slurry that 40g/L is required and measured is 43.7g, and load weighted slurries are added to
In slurry disk, quantitative coating is carried out, contact layer slurries are coated on carrier surface, practical coating slurry weight is 44.2g；
(5) contact layer is dried: the catalyst coated passes through 120 DEG C of flash bakings, and drying time 5h will be in coating
Water evaporation is fallen；
(6) contact layer roasts: drying rear catalyst being put into Muffle furnace, 500 DEG C of roasting 1.5h are cooling after heat preservation
To room temperature, weighing catalyst weight is 109.1g；
External coating River Bank Stability and coating
(7) outer layer River Bank Stability: sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent are added in proportion
Into deionized water, weight ratio 0.77.5:0.20:0.01:0.015 is stirred；
(8) outer layer slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 320 turns/
Point, runing time 4h, serous granule degree to D90 is 13.8um；
(9) in outer layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 580 DEG C of Muffle furnaces and is roasted
20min is burnt, is cooled to room temperature, weighing its powder quality is 3.33g, with the quality divided by 10g, just obtains slurry solid content
33.3%；
(10) in outer layer slurries precious metal solution addition: take ball milling rear slurry 1000g, precious metals pt additional amount is 50g/
ft3, coated weight 95g/L, the amount for calculating precious metals pt is 6.189g, and the amount for weighing precious metals pt solution is
51.97g in the slurries after precious metal solution to be slowly added into ball milling, stirs 4h, until active component noble metal is thoroughly dispersed in
In slurries, the amount of added noble metal is 50/ft3；
(11) outer layer slurries pH is adjusted: organic acid tartaric acid being slowly added into noble metal slurries, the PH of slurries is adjusted
To 4.49；
(12) doping of manganese: being slowly added dropwise a certain amount of manganese nitrate in outer layer slurries for realizing the doping of manganese element,
The quality of manganese oxide is 2% of powder quality after outer layer slurries roast；
(13) outer layer slurry layer coats: being coated with quantitatively coating special plane, catalyst carrier be placed at application chamber,
According to coated weight be 95g/L requirement and the wet weight gain of solid content calculating target measured is 85.9g, and load weighted slurries are added to
In slurry disk, quantitative coating is carried out, outer coating slurries are coated on contact layer coating, practical coating slurry weight is
86.3g；
(14) outer layer slurry layer is dried: the catalyst coated passes through 120 DEG C of flash bakings, and drying time 5h will be applied
Water evaporation in layer is fallen；
(15) outer layer slurry layer roasts: drying rear catalyst being put into Muffle furnace, 500 DEG C of baking 1.5h, heat preservation terminates
After be cooled to room temperature, weighing catalyst weight be 137.5g.
Embodiment three: the preparation method of diesel vehicle platinum base oxidative catalyst includes the following steps:
Contact layer River Bank Stability and coating
(1) contact layer River Bank Stability: in proportion by Al2O3, zirconium acetate be add to deionized water, weight ratio 0.9:
0.1, it stirs, it is 4.38 that nitric acid, which is added, and adjusts slurries PH；
(2) contact layer slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 380 turns/
Point, runing time 3h, serous granule degree to D90 is 11.4um；
(3) in contact layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 600 DEG C of Muffle furnaces
10min is roasted, is cooled to room temperature, weighing its powder quality is 2.69, and with the quality divided by 10g, just obtaining slurry solid content is
26.9%；
(4) contact layer coats: it is coated with quantitatively coating special plane, catalyst carrier is placed at application chamber, according to
Coated weight is that the wet weight gain of solid content calculating target slurry that 50g/L is required and measured is 55.94g, and load weighted slurries are added
Into slurry disk, quantitative coating is carried out, contact layer slurries are coated on carrier surface, practical coating slurry weight is
55.98g；
(5) contact layer is dried: the catalyst coated passes through 150 DEG C of flash bakings, and drying time 3h will be in coating
Water evaporation is fallen；
(6) contact layer roasts: drying rear catalyst being put into Muffle furnace, 550 DEG C of roasting 1h are cooled to after heat preservation
Room temperature, weighing catalyst weight are 112.3g；
External coating River Bank Stability and coating
(7) preparation of outer layer slurries: sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent are pressed in proportion
Weight ratio 0.845:0.10:0.03:0.025, which is add to deionized water, to be stirred；
(8) outer layer slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 380 turns/
Point, runing time 3h, serous granule degree to D90 is 11.3um；
(9) in outer layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 600 DEG C of Muffle furnaces and is roasted
10min is burnt, is cooled to room temperature, weighing its powder quality is 3.41g, with the quality divided by 10g, just obtains slurry solid content
34.1%；
(10) in outer layer slurries precious metal solution addition: take ball milling rear slurry 1000g, precious metals pt additional amount is 15g/
ft3, coated weight 90g/L, the amount for calculating precious metals pt is 2.007g, and the amount for weighing precious metals pt solution is
16.85g in the slurries after precious metal solution to be slowly added into ball milling, stirs 3h, until active component noble metal is thoroughly dispersed in
In slurries, the amount of added noble metal is 15/ft3；
(11) outer layer slurries PH is adjusted: organic acid tartaric acid being slowly added into noble metal slurries, the pH of slurries is adjusted
To 4.46；
(12) doping of manganese: being slowly added dropwise a certain amount of manganese nitrate in outer layer slurries for realizing the doping of manganese element,
The quality of manganese oxide is 3% of powder quality after outer layer slurries roast；
(13) outer layer slurry layer coats: being coated with quantitatively coating special plane, catalyst carrier be placed at application chamber,
According to coated weight be 90g/L requirement and the wet weight gain of solid content calculating target measured is 79.4g, and load weighted slurries are added to
In slurry disk, quantitative coating is carried out, outer coating slurries are coated on contact layer coating, practical coating slurry weight is
80.2g
(14) outer layer slurry layer is dried: the catalyst coated passes through 150 DEG C of flash bakings, and drying time 2h will be applied
Water evaporation in layer is fallen；
(15) outer layer slurry layer roasts: drying rear catalyst being put into Muffle furnace, 550 DEG C of baking 1h, after heat preservation
It is cooled to room temperature, weighing catalyst weight is 139.6g.
Catalytically active assessment is carried out to the catalyst that embodiment two is prepared
1, fresh state catalyst activity evaluation
Test carries out in high temperature furnace.
Test method: NO, CO will be contained2、H2O、C3H8, CO gaseous mixture be passed through in high temperature reaction stove, wherein NO:
300ppm, CO:500ppm, C3H8: 300ppm, H2O:6%, CO2: 6%；Heating rate is that every min heats up 10 DEG C, is eventually raised to
500℃。
Test result is as shown in table 1.
The fresh state catalyst activity evaluation result of table 1
As shown in Table 1, the initiation temperature T50 of the HC and CO of catalyst prepared by embodiment two are respectively 255 DEG C and 108
℃；NO is converted into NO2Conversion ratio reach highest, conversion ratio 91.54% at 200 DEG C.
2, heat ageing state catalyst activity is evaluated
Pre-treatment: being placed in aging in Muffle furnace for catalyst prepared by embodiment two first, and aging temperature is 650 DEG C, always
The change time be 20h, the then carry out activity investigation of NOx, CO and HC in simulated automotive tail gas again,
Test is carried out in high temperature reaction stove.
Test method: NO, CO will be contained2、H2O、C3H8, CO gaseous mixture be passed through in high temperature reaction stove, wherein NO:
300ppm, CO:500ppm, C3H8: 300ppm, H2O:6%, CO2: 6%；Heating rate is that every min heats up 10 DEG C, is eventually raised to
500℃。
Test result is as shown in table 2.
2 aging state catalyst activity evaluation result of table
As shown in Table 2, the initiation temperature T50 of the HC and CO of catalyst prepared by embodiment two are respectively 322 DEG C and 136
℃；NO is converted into NO2At 200 DEG C, conversion ratio reaches highest, conversion ratio 89.9%.
Claims (1)
1. a kind of diesel vehicle platinum base oxidative catalyst, it is characterised in that: including carrier, the carrier is cordierite honeycomb pottery
Porcelain is coated with contact layer on the carrier, and outer layer slurry layer is coated on the contact layer, and the contact layer is aluminium oxide, institute
The coated weight for stating contact layer is 30 ~ 50g/L, and the outer layer slurry layer is sial composite oxides, expensive in the outer layer slurry layer
The amount of Pt metal is 15 ~ 60g/ft3, the coated weight of the outer layer slurry layer is 90 ~ 100g/L；Preparation method, including walk as follows
It is rapid:
The River Bank Stability of contact layer and coating
(1) preparation of contact layer slurries: by weight 0.9 ~ 0.96:0.04 ~ 0.1 by Al2O3With zirconium acetate be added separately to from
It in sub- water, stirs and slurries is made, dust technology is added and adjusts slurries pH less than 4.5；
(2) slurries ball milling: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 250 ~ 380 revs/min, fortune
The row time is 3 ~ 6h, and serous granule degree to D90 is 2 ~ 20um；
(3) in contact layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 550 ~ 600 DEG C of Muffle furnaces
10 ~ 20min is roasted, is cooled to room temperature, weighs its powder quality, with the quality divided by 10g, just obtains slurry solid content；
(4) it the coating of contact layer: is coated, catalyst carrier is placed at application chamber, according to painting with quantitatively coating special plane
The amount of covering is that the solid content that 30 ~ 50g/L is required and measured calculates the wet weight gain of target, and the slurries calculated are added in slurry disk,
Quantitative coating is carried out, contact layer slurries are coated on carrier surface；
(5) drying of contact layer slurries: the catalyst coated passes through 100 ~ 150 DEG C of flash bakings, and drying time will for 3 ~ 6h
Water evaporation in coating is fallen；
(6) roasting of contact layer slurries: drying rear catalyst is put into Muffle furnace, 450 ~ 550 DEG C of 1 ~ 2h of roasting, heat preservation terminates
After be cooled to room temperature, weigh catalyst weight；
The River Bank Stability of outer layer slurry layer and coating
(7) outer layer River Bank Stability: sial is answered by weight 0.695 ~ 0.88:0.1 ~ 0.25:0.01 ~ 0.03:0.01 ~ 0.025
It closes oxide, β-molecular sieve, ammonium tungstate, zirconium glue caking agent to be add to deionized water, stir, sial combined oxidation
The mass percent of silicon is 1.5 ~ 5% in object, remaining is aluminum oxide；
(8) ball milling of outer layer slurries: slurries are ground by planetary ball mill, and the revolving speed of planetary ball mill is 250 ~ 380 turns/
Point, runing time is 3 ~ 6h, and serous granule degree to D90 is 2 ~ 20um；
(9) in outer layer slurries solid content measurement: take 10g slurries in dry pot, dry pot be placed in 550 ~ 600 DEG C of Muffle furnaces and is roasted
10 ~ 20min is burnt, is cooled to room temperature, weighs its powder quality, with the quality divided by 10g, just obtains slurry solid content；
(10) in outer layer slurries precious metal solution addition: by noble metal [Pt (NH3)4](OH)2After solution is slowly added into ball milling
Slurries in, stir 2 ~ 5h, until active component precious metals pt solution is thoroughly dispersed in slurries；
(11) outer layer slurries pH is adjusted: dust technology being slowly added into noble metal slurries, 4.5 or less the pH to of slurries is adjusted；
(12) doping of manganese: being slowly added dropwise a certain amount of manganese nitrate in outer layer slurries for realizing the doping of manganese element, manganese
Doping indicates that the quality of manganese oxide is 1 ~ 3% of powder quality after outer layer slurries roast with manganese oxide；
(13) outer layer slurry coating coats: being coated with quantitatively coating special plane, catalyst carrier is placed at application chamber, is pressed
It is that the solid content that 90 ~ 100g/L is required and measured calculates the wet weight gain of target according to coated weight, the slurries calculated is added to slurry
In disk, quantitative coating is carried out, on the contact layer by the coating of outer coating slurries；
(14) outer layer slurries are dried: the catalyst coated passes through 100 ~ 150 DEG C of flash bakings, and drying time is 3 ~ 6h by coating
In water evaporation fall；
(15) outer layer slurries roast: drying rear catalyst being put into Muffle furnace, 450 ~ 550 DEG C of 1 ~ 2h of roasting, after heat preservation
It is cooled to room temperature, weighs catalyst weight.
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| CN109261200A (en) * | 2018-09-30 | 2019-01-25 | 无锡威孚环保催化剂有限公司 | NH_3 leakage catalyst and preparation method thereof for equivalent burn natural gas engines |
| CN115382543A (en) * | 2022-08-30 | 2022-11-25 | 惠州市瑞合环保科技有限公司 | Diesel oil oxidation catalyst containing strontium and tungsten and preparation method thereof |
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