CN105728026A - Diesel vehicle platinum-based oxidation catalyst and preparation method thereof - Google Patents
Diesel vehicle platinum-based oxidation catalyst and preparation method thereof Download PDFInfo
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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 invention relates to a diesel vehicle platinum-based oxidation catalyst and a preparation method thereof.The catalyst comprises a carrier coated with a contact layer.The contact layer is coated with an outer size layer and is an aluminum oxide size layer.The coating amount of the contact layer is 30-50 g/L, and the coating amount of the outer size layer is 90-100 g/L.The preparation method is simple, steps are easy to operate, the outer size layer is doped with aluminum oxide as the dispersing agent, ammonium tungstate serves as a thermal stabilizing auxiliary, a molecular screen is a low-temperature HC storage material, and HC adsorption at a low temperature can be improved; by adding zirconium adhesives, acid can have effects on fixing precious metal and preventing transfer of heavy metal; a manganous nitrate solution is added after heavy metal is fixed.By adding ammonium tungstate and manganous nitrate, a good combustion effect is achieved when the addition amount of heavy metal is small, HC and CO low-temperature combustion activity is good, durability is better, the production cost of the catalyst is reduced, and the competitiveness of the oxidation catalyst is improved.
Description
Technical field
The present invention relates to a kind of diesel vehicle platino oxidative catalyst and preparation method thereof, belong to catalyst preparation technical field.
Background technology
One of tail gas pollution of motor-driven vehicle main source becoming atmospheric pollution.In city, most NOX, CO, HC and PM are produced by motor-vehicle tail-gas, and especially NOx and the PM discharge proportion of diesel vehicle is maximum.Human body is not only caused damage but also can produce photochemical fog under certain conditions by these pollutant, makes vegetation dead, and the environment of human survival is seriously damaged.The beginning of this year, diesel vehicle state four Abgasgesetz is formally implemented in China, it is contemplated that within 2018, will implement more strict state five regulation.Therefore, the catalytic conversion efficiency of diesel vehicle oxidative catalyst be it is also proposed higher requirement.
Diesel vehicle oxidative catalyst (DOC) is for the soluble organic fraction (SOF) in CO, NO, HC and PM in the tail gas of oxidated diesel oil car, its coating is mainly made up of oxide carrier and active noble metal constituent, and noble metal is the key component of oxidative catalyst.For diesel vehicle DOC, it is simply that utilize DOC can reduce the activation energy of chemical reaction of HC, CO and SOF etc. in diesel engine vent gas, make these materials can carry out oxidation reaction at a lower temperature with the oxygen in tail gas, be converted into CO2 and H2O；Oxidation catalyst is generally with ceramic honey comb or honeycomb for carrier, and load oxide coating and active metal component on it, conventional noble metal component is Pt, Pd etc..Before current state four Abgasgesetz, the widely used noble metal of exhaust gas from diesel vehicle post processing is Pt.
There are problems in the existing diesel vehicle oxidative catalyst of state four discharge phase, cryogenic property is good not in catalyst low temperature ignition, thermal endurance, cost etc., and aging catalyst hydraulic performance decline is obvious, and the big cost of coating bullion content is high.
Summary of the invention
The invention aims to solve the problems referred to above, it is provided that a kind of simple diesel vehicle platino oxidative catalyst of preparation method and preparation method thereof, the catalyst prepared has better HC and CO low temperature light-off performance, and durability is better.
The present invention adopts the following technical scheme that a kind of diesel vehicle platino oxidative catalyst, including carrier, described carrier is cordierite honeycomb ceramic, described carrier is coated with contact layer, being coated with outer layer slurry layer on described contact layer, described contact layer is aluminium oxide, and the coated weight of described contact layer is 30～50g/L, described outer layer slurry layer is sial composite oxides, and in described outer layer slurry layer, the amount of precious metals pt is 15～60g/ft3, the coated weight of described outer layer slurry layer is 90～100g/L.
The preparation method of diesel vehicle platino oxidative catalyst, comprises the steps:
The River Bank Stability of contact layer and coating
(1) preparation of contact layer serosity: by weight 0.9～0.96:0.04～0.1 by Al2O3It is added separately in deionized water with zirconium acetate, stirs and make serosity, add dust technology and regulate serosity pH less than 4.5；
(2) serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 250～380 revs/min, and the operation time is 3～6h, and serous granule degree is 2～20um to D90；
(3) mensuration of solid content in contact layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 10-20min in 550～600 DEG C of Muffle furnaces, is cooled to room temperature, weigh its powder quality, by this quality divided by 10g, just obtains slurry solid content；
(4) coating of contact layer: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that 30～50g/L solid content requiring and recording calculates the wet weightening finish of target according to coated weight, the serosity calculated is joined in slurry dish, quantitatively it is coated with, contact layer serosity is coated on carrier surface；
(5) drying of contact layer serosity: the catalyst being coated with is through 100～150 DEG C of flash bakings, and drying time is that the water in coating is evaporated by 3～6h；
(6) roasting of contact layer serosity: put in Muffle furnace by drying rear catalyst, 450～550 DEG C of roasting 1～2h, insulation is cooled to room temperature after terminating, weigh 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 joined in deionized water, stir；
(8) ball milling of outer layer serosity: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 250～380 revs/min, and the operation time is 3～6h, and serous granule degree is 2～20um to D90；
(9) mensuration of solid content in outer layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 10～20min in 550～600 DEG C of Muffle furnaces, is cooled to room temperature, weigh its powder quality, by this quality divided by 10g, just obtains slurry solid content；
(10) addition of precious metal solution in outer layer serosity: by noble metal [Pt (NH3)4](OH)2Solution is slowly added in the serosity after ball milling, stirs 2～5h, is thoroughly dispersed in serosity to active component precious metals pt solution；
(11) outer layer serosity pH regulator: be slowly added into by dust technology in noble metal serosity, adjusts the pH to less than 4.5 of serosity；
(12) doping of manganese: be slowly added dropwise a certain amount of manganese nitrate in outer layer serosity for realizing the doping of manganese element；
(13) outer layer slurry coating coating: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that 90～100g/L solid content requiring and recording calculates the wet weightening finish of target according to coated weight, the serosity calculated is joined in slurry dish, quantitatively it is coated with, outer coating serosity is coated with on the contact layer；
(14) outer layer serosity is dried: the catalyst being coated with is through 100～150 DEG C of flash bakings, and drying time is that the water in coating is evaporated by 3～6h；
(15) outer layer serosity roasting: put in Muffle furnace by drying rear catalyst, 450～550 DEG C of roasting 1～2h, insulation is cooled to room temperature after terminating, weigh catalyst weight.
Further, in the sial composite oxides in described step (8), the mass percent of silicon is 1.5～5%, and all the other are aluminium sesquioxide.
Further, the doping manganese oxide of the manganese in described step (12) represents, the quality of manganese oxide is after outer layer serosity roasting the 1～3% of powder quality.
nullPreparation method of the present invention is simple，Step is easily operated，Carrier is coated with contact layer and outer layer slurry layer successively，Outer layer slurry layer is mixed silicon aluminium oxide as dispersant，Ammonium tungstate adds in powder body as auxiliary agent，The heat stability of coating can be improved，Strengthen the endurance quality of catalyst，Catalyst surface acidic site can be strengthened again，Be conducive to the generation of reduction-state platinum，Improve the activity of catalyst，Molecular sieve is that low temperature HC stores material，Improve the absorption of HC under low temperature，It is simultaneously introduced the noble metal that a small amount of acid is fixing，In case noble metal migrates，Last addition manganese nitrate solution after noble metal is fixing，CO ignition and NO are aoxidized by the doping of manganese good facilitation，Adopt catalyst prepared by the present invention by adding ammonium tungstate and manganese nitrate，Good ignition effect is obtained in the less situation of noble metal addition，There is better HC and CO low temperature light-off performance，And endurance quality is better，Reduce the production cost of catalyst，Improve the competitiveness of oxidative catalyst.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further illustrated.
All adopting diameter in three below example is 80mm, the high cylindrical cordierite ceramic honey comb for 60mm is carrier, volume is 0.301L, and vehicle weight is 97g, and 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 platino oxidative catalyst, comprises the steps:
Contact layer River Bank Stability and coating
(1) preparation of contact layer serosity: by Al2O3, zirconium acetate by weight joining in deionized water for 0.96:0.04, stir, adding nitric acid, to regulate serosity pH be 4.45；
(2) contact layer serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 250 revs/min, and the operation time is 6h, and serous granule degree is 15.3um to D90；
(3) mensuration of solid content in contact layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 20min in 550 DEG C of Muffle furnaces, is cooled to room temperature, weighing its powder quality is 2.81g, and by this quality divided by 10g, just obtaining slurry solid content is 28.1%；
(4) contact layer coating: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that the 30g/L solid content calculating target slurry requiring and recording is wet according to coated weight and increases weight as 32.1g, load weighted serosity is joined in slurry dish, quantitatively it is coated with, being coated on carrier surface by contact layer serosity, practical coating slurry weight is 33.2g；
(5) contact layer is dried: the catalyst being coated with is through 100 DEG C of flash bakings, and drying time is 6h, is evaporated by the water in coating；
(6) contact layer roasting: put in Muffle furnace by drying rear catalyst, 450 DEG C of roasting 2h, insulation is cooled to room temperature after terminating, and weighing catalyst weight is 106.2g；
External coating River Bank Stability and coating
(7) preparation of outer layer serosity: in proportion by sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent by weight joining in deionized water for 0.71:0.25:0.02:0.02, stir；
(8) outer layer serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 250 revs/min, and the operation time is 6h, and serous granule degree is 13.8um to D90；
(9) mensuration of solid content in outer layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 20min in 550 DEG C of Muffle furnaces, is cooled to room temperature, weighing its powder quality is 3.25g, by this quality divided by 10g, just obtains slurry solid content 32.5%；
(10) addition of precious metal solution in outer layer serosity: take ball milling rear slurry 1000g, precious metals pt addition is 60g/ft3, coated weight is 100g/L, and the amount calculating precious metals pt is 6.88g, the amount weighing precious metals pt solution is 57.82g, is slowly added into by precious metal solution in the serosity after ball milling, stirs 5h, being thoroughly dispersed in serosity to active component noble metal, the amount of added noble metal is 60/ft3；
(11) outer layer serosity pH regulator: be slowly added into by dust technology in noble metal serosity, adjusts the pH to 4.45 of serosity；
(12) doping of manganese: being slowly added dropwise a certain amount of manganese nitrate in outer layer serosity for realizing the doping of manganese element, the doping manganese oxide of manganese represents, the quality of manganese oxide is after outer layer serosity roasting the 1% of powder quality；
(13) outer layer slurry layer coats: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that the 100g/L solid content calculating target requiring and recording is wet according to coated weight and increases weight as 94g, load weighted serosity is joined in slurry dish, quantitatively it is coated with, being coated in by outer coating serosity on contact layer coating, practical coating slurry weight is 94.8g
(14) outer layer slurry layer is dried: the catalyst being coated with is through 100 DEG C of flash bakings, and drying time is 6h, is evaporated by the water in coating；
(15) outer layer slurry layer roasting: put in Muffle furnace by drying rear catalyst, 450 DEG C of roasting 2h, insulation is cooled to room temperature after terminating, and weighing catalyst weight is 137.1g.
Embodiment two: the preparation method of diesel vehicle platino oxidative catalyst, comprises the steps:
Contact layer River Bank Stability and coating
(1) preparation of contact layer serosity: in proportion by Al2O3, zirconium acetate join in deionized water, weight ratio is 0.93:0.07, stirs, add nitric acid regulate serosity PH be 4.43；
(2) contact layer serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 320 revs/min, and the operation time is 4h, and serous granule degree is 12.3um to D90；
(3) mensuration of solid content in contact layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 20min in 580 DEG C of Muffle furnaces, is cooled to room temperature, weighing its powder quality is 2.78g, and by this quality divided by 10g, just obtaining slurry solid content is 27.8%；
(4) contact layer coating: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that the 40g/L solid content calculating target slurry requiring and recording is wet according to coated weight and increases weight as 43.7g, load weighted serosity is joined in slurry dish, quantitatively it is coated with, being coated on carrier surface by contact layer serosity, practical coating slurry weight is 44.2g；
(5) contact layer is dried: the catalyst being coated with is through 120 DEG C of flash bakings, and drying time is 5h, is evaporated by the water in coating；
(6) contact layer roasting: put in Muffle furnace by drying rear catalyst, 500 DEG C of roasting 1.5h, insulation is cooled to room temperature after terminating, and weighing catalyst weight is 109.1g；
External coating River Bank Stability and coating
(7) outer layer River Bank Stability: joining in deionized water by sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent in proportion, weight ratio is 0.77.5:0.20:0.01:0.015, stirs；
(8) outer layer serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 320 revs/min, and the operation time is 4h, and serous granule degree is 13.8um to D90；
(9) mensuration of solid content in outer layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 20min in 580 DEG C of Muffle furnaces, is cooled to room temperature, weighing its powder quality is 3.33g, by this quality divided by 10g, just obtains slurry solid content 33.3%；
(10) addition of precious metal solution in outer layer serosity: take ball milling rear slurry 1000g, precious metals pt addition is 50g/ft3, coated weight is 95g/L, and the amount calculating precious metals pt is 6.189g, the amount weighing precious metals pt solution is 51.97g, is slowly added into by precious metal solution in the serosity after ball milling, stirs 4h, being thoroughly dispersed in serosity to active component noble metal, the amount of added noble metal is 50/ft3；
(11) outer layer serosity pH regulator: be slowly added in noble metal serosity by organic acid tartaric acid, adjusts the PH to 4.49 of serosity；
(12) doping of manganese: be slowly added dropwise a certain amount of manganese nitrate in outer layer serosity for realizing the doping of manganese element, the quality of manganese oxide is after outer layer serosity roasting the 2% of powder quality；
(13) outer layer slurry layer coats: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that the 95g/L solid content calculating target requiring and recording is wet according to coated weight and increases weight as 85.9g, load weighted serosity is joined in slurry dish, quantitatively it is coated with, being coated in by outer coating serosity on contact layer coating, practical coating slurry weight is 86.3g；
(14) outer layer slurry layer is dried: the catalyst being coated with is through 120 DEG C of flash bakings, and drying time is 5h, is evaporated by the water in coating；
(15) outer layer slurry layer roasting: put in Muffle furnace by drying rear catalyst, 500 DEG C bakee 1.5h, and insulation is cooled to room temperature after terminating, and weighing catalyst weight is 137.5g.
Embodiment three: the preparation method of diesel vehicle platino oxidative catalyst, comprises the steps:
Contact layer River Bank Stability and coating
(1) contact layer River Bank Stability: in proportion by Al2O3, zirconium acetate join in deionized water, weight ratio is 0.9:0.1, stirs, add nitric acid regulate serosity PH be 4.38；
(2) contact layer serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 380 revs/min, and the operation time is 3h, and serous granule degree is 11.4um to D90；
(3) mensuration of solid content in contact layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 10min in 600 DEG C of Muffle furnaces, is cooled to room temperature, weighing its powder quality is 2.69, and by this quality divided by 10g, just obtaining slurry solid content is 26.9%；
(4) contact layer coating: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that the 50g/L solid content calculating target slurry requiring and recording is wet according to coated weight and increases weight as 55.94g, load weighted serosity is joined in slurry dish, quantitatively it is coated with, being coated on carrier surface by contact layer serosity, practical coating slurry weight is 55.98g；
(5) contact layer is dried: the catalyst being coated with is through 150 DEG C of flash bakings, and drying time is 3h, is evaporated by the water in coating；
(6) contact layer roasting: put in Muffle furnace by drying rear catalyst, 550 DEG C of roasting 1h, insulation is cooled to room temperature after terminating, and weighing catalyst weight is 112.3g；
External coating River Bank Stability and coating
(7) preparation of outer layer serosity: sial composite oxides, β-molecular sieve, ammonium tungstate, zirconium glue caking agent are joined in deionized water by weight 0.845:0.10:0.03:0.025 stir in proportion；
(8) outer layer serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 380 revs/min, and the operation time is 3h, and serous granule degree is 11.3um to D90；
(9) mensuration of solid content in outer layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 10min in 600 DEG C of Muffle furnaces, is cooled to room temperature, weighing its powder quality is 3.41g, by this quality divided by 10g, just obtains slurry solid content 34.1%；
(10) addition of precious metal solution in outer layer serosity: take ball milling rear slurry 1000g, precious metals pt addition is 15g/ft3, coated weight is 90g/L, and the amount calculating precious metals pt is 2.007g, the amount weighing precious metals pt solution is 16.85g, is slowly added into by precious metal solution in the serosity after ball milling, stirs 3h, being thoroughly dispersed in serosity to active component noble metal, the amount of added noble metal is 15/ft3；
(11) outer layer serosity PH regulates: be slowly added in noble metal serosity by organic acid tartaric acid, adjusts the pH to 4.46 of serosity；
(12) doping of manganese: be slowly added dropwise a certain amount of manganese nitrate in outer layer serosity for realizing the doping of manganese element, the quality of manganese oxide is after outer layer serosity roasting the 3% of powder quality；
(13) outer layer slurry layer coats: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that the 90g/L solid content calculating target requiring and recording is wet according to coated weight and increases weight as 79.4g, load weighted serosity is joined in slurry dish, quantitatively it is coated with, being coated in by outer coating serosity on contact layer coating, practical coating slurry weight is 80.2g
(14) outer layer slurry layer is dried: the catalyst being coated with is through 150 DEG C of flash bakings, and drying time is 2h, is evaporated by the water in coating；
(15) outer layer slurry layer roasting: put in Muffle furnace by drying rear catalyst, 550 DEG C bakee 1h, and insulation is cooled to room temperature after terminating, and weighing catalyst weight is 139.6g.
The catalyst that embodiment two is prepared carries out catalytically active assessment
1, fresh state catalyst activity is evaluated
Test carries out in high temperature furnace.
Method of testing: will containing NO, CO2、H2O、C3H8, CO gaseous mixture pass 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 DEG C.
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 HC and the CO of the catalyst prepared by embodiment two respectively 255 DEG C and 108 DEG C；NO is converted into NO2Conversion ratio reach the highest when 200 DEG C, conversion ratio is 91.54%.
2, heat ageing state catalyst activity is evaluated
Pre-treatment: first catalyst prepared by embodiment two is placed in Muffle furnace aging, aging temperature is 650 DEG C, and ageing time is 20h, then again the NOx in simulated automotive tail gas, CO and HC carrying out activity investigate,
Test is to carry out in high temperature reaction stove.
Method of testing: will containing NO, CO2、H2O、C3H8, CO gaseous mixture pass 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 DEG C.
Test result is as shown in table 2.
The aging state catalyst activity evaluation result of table 2
As shown in Table 2, the initiation temperature T50 of HC and the CO of the catalyst prepared by embodiment two respectively 322 DEG C and 136 DEG C；NO is converted into NO2When 200 DEG C, conversion ratio reaches the highest, and conversion ratio is 89.9%.
Claims (4)
1. a diesel vehicle platino oxidative catalyst, it is characterized in that: include carrier, described carrier is cordierite honeycomb ceramic, described carrier is coated with contact layer, being coated with outer layer slurry layer on described contact layer, described contact layer is aluminium oxide, and the coated weight of described contact layer is 30 ~ 50g/L, described outer layer slurry layer is sial composite oxides, and in described outer layer slurry layer, the amount of precious metals pt is 15 ~ 60g/ft3, the coated weight of described outer layer slurry layer is 90 ~ 100g/L.
2. the preparation method of diesel vehicle platino oxidative catalyst as claimed in claim 1, it is characterised in that: comprise the steps:
The River Bank Stability of contact layer and coating
(1) preparation of contact layer serosity: by weight 0.9 ~ 0.96:0.04 ~ 0.1 by Al2O3It is added separately in deionized water with zirconium acetate, stirs and make serosity, add dust technology and regulate serosity pH less than 4.5；
(2) serosity ball milling: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 250 ~ 380 revs/min, and the operation time is 3 ~ 6h, and serous granule degree is 2 ~ 20um to D90；
(3) mensuration of solid content in contact layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 10 ~ 20min in 550 ~ 600 DEG C of Muffle furnaces, is cooled to room temperature, weigh its powder quality, by this quality divided by 10g, just obtains slurry solid content；
(4) coating of contact layer: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that 30 ~ 50g/L solid content requiring and recording calculates the wet weightening finish of target according to coated weight, the serosity calculated is joined in slurry dish, quantitatively it is coated with, contact layer serosity is coated on carrier surface；
(5) drying of contact layer serosity: the catalyst being coated with is through 100 ~ 150 DEG C of flash bakings, and drying time is that the water in coating is evaporated by 3 ~ 6h；
(6) roasting of contact layer serosity: put in Muffle furnace by drying rear catalyst, 450 ~ 550 DEG C of roasting 1 ~ 2h, insulation is cooled to room temperature after terminating, weigh 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 joined in deionized water, stir；
(8) ball milling of outer layer serosity: serosity grinds through planetary ball mill, and the rotating speed of planetary ball mill is 250 ~ 380 revs/min, and the operation time is 3 ~ 6h, and serous granule degree is 2 ~ 20um to D90；
(9) mensuration of solid content in outer layer serosity: take 10g serosity in dry pot, dry pot is placed in roasting 10 ~ 20min in 550 ~ 600 DEG C of Muffle furnaces, is cooled to room temperature, weigh its powder quality, by this quality divided by 10g, just obtains slurry solid content；
(10) addition of precious metal solution in outer layer serosity: by noble metal [Pt (NH3)4](OH)2Solution is slowly added in the serosity after ball milling, stirs 2 ~ 5h, is thoroughly dispersed in serosity to active component precious metals pt solution；
(11) outer layer serosity pH regulator: be slowly added into by dust technology in noble metal serosity, adjusts the pH to less than 4.5 of serosity；
(12) doping of manganese: be slowly added dropwise a certain amount of manganese nitrate in outer layer serosity for realizing the doping of manganese element；
(13) outer layer slurry coating coating: be coated with quantitatively coating special plane, catalyst carrier is positioned over application chamber place, it is that 90 ~ 100g/L solid content requiring and recording calculates the wet weightening finish of target according to coated weight, the serosity calculated is joined in slurry dish, quantitatively it is coated with, outer coating serosity is coated with on the contact layer；
(14) outer layer serosity is dried: the catalyst being coated with is through 100 ~ 150 DEG C of flash bakings, and drying time is that the water in coating is evaporated by 3 ~ 6h；
(15) outer layer serosity roasting: put in Muffle furnace by drying rear catalyst, 450 ~ 550 DEG C of roasting 1 ~ 2h, insulation is cooled to room temperature after terminating, weigh catalyst weight.
3. the preparation method of diesel vehicle platino oxidative catalyst as claimed in claim 2, it is characterised in that: in the sial composite oxides in described step (8), the mass percent of silicon is 1.5 ~ 5%, and all the other are aluminium sesquioxide.
4. the preparation method of diesel vehicle platino oxidative catalyst as claimed in claim 2, it is characterised in that: the doping manganese oxide of the manganese in described step (12) represents, the quality of manganese oxide is after outer layer serosity roasting the 1 ~ 3% of powder quality.
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