CN105797767B - A kind of diesel vehicle oxidation catalyst with low temperature active and preparation method thereof - Google Patents
A kind of diesel vehicle oxidation catalyst with low temperature active and preparation method thereof Download PDFInfo
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- CN105797767B CN105797767B CN201610144944.5A CN201610144944A CN105797767B CN 105797767 B CN105797767 B CN 105797767B CN 201610144944 A CN201610144944 A CN 201610144944A CN 105797767 B CN105797767 B CN 105797767B
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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
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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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
- B01J2229/20—After treatment, characterised by the effect to be obtained to introduce other elements in the catalyst composition comprising the molecular sieve, but not specially in or on the molecular sieve itself
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The present invention relates to a kind of diesel vehicle oxidation catalysts with low temperature active and preparation method thereof, the coating coated including carrier and on carrier, load has noble metal in coating, coating includes tungsten sial composite oxides and molecular sieve, noble metal is the mixture of one or both of Pt, Pd substance, the coated weight of coating is 80 180 g/l, the coated weight of noble metal is 0.5 4.5 g/l, tungsten sial composite oxides are prepared using equi-volume impregnating first during preparation, are then 1 by the mass ratio of molecular sieve and tungsten sial composite oxides：2~10 are made slurries, and add precious metals pt, Pd, finally immerse in slurries carrier and diesel vehicle oxidation catalyst is obtained after drying and sintering.Preparation method of the present invention is simple, and step is easily operated, and the diesel vehicle oxidation catalyst initiation temperature being prepared is low, high conversion rate, thermal stability are good, has good oxidability to the HC in exhaust gas from diesel vehicle and CO, and with preferable sulfur resistive ability.
Description
Technical field
The present invention relates to a kind of diesel vehicle oxidation catalysts with low temperature active and preparation method thereof, belong to catalyst
Preparing technical field.
Background technology
With economic rapid development, people's living standards continue to improve, transportation has obtained unprecedented
Development, the yield and ownership of motor vehicle increase year by year.When fuel-cell vehicle and hybrid electric vehicle are not yet popularized, diesel vehicle
There is the market demand that higher fuel-economy type, relatively lower tail gas pollution are emitted on 21 century to increase compared with gasoline car
Quickly.And being continuously increased with diesel vehicle quantity, air environmental pollution caused by exhaust gas from diesel vehicle discharge also increasingly cause
The extensive concern of people.Mainly there are carbon monoxide (CO), hydrocarbon (HC), nitrogen oxides (NOX) in the pollutant of emission of diesel engine
And particulate matter (PM), particulate matter are mainly made of dry carbon, dissolved organic matter (SOF) and a small amount of sulfuric acid and sulfate.Bavin
Oil machine oxidation catalyst (DOC) is the diesel engine vent gas post-processing technology being applied earliest, is mainly used for eliminating in tail gas
HC, CO and PM in SOF, usually catalytic removal effect is preferable under 250 DEG C or more of environment.DOC both can be used alone,
It can be used in combination again with other exhaust aftertreatment technologies, diesel oil upgrading with additive technology, internal purification technology.And DOC
It safeguards simply, need not regenerate, therefore be most widely used Diesel Engine After-treatment Technology.But due to containing in domestic oil product
Sulfur content is higher, and more sulfur dioxide (SO is contained in tail gas2), and sulfur dioxide can be oxidized to sulfur trioxide (SO3), into
One step forms sulfate, causes catalyst inactivation, poisoning, reduces catalyst and CO, HC and SOF in exhaust gas from diesel vehicle are turned
Change ability, so DOC should have certain sulfur resistance.In recent years, as emission regulation is more stringent, to oxidation catalyst
Catalytic performance requirement it is also higher and higher, such as low temperature light-off performance, service life.
The content of the invention
The purpose of the present invention is to solve the above problems, provide a kind of diesel vehicle oxidized form with low temperature active and urge
Agent and preparation method thereof, the diesel vehicle oxidation catalyst initiation temperature that is prepared is low, high conversion rate, thermal stability are good,
There is good oxidability to the HC in exhaust gas from diesel vehicle and CO, and with preferable sulfur resistive ability.
The present invention adopts the following technical scheme that：A kind of diesel vehicle oxidation catalyst with low temperature active, including carrier
And the coating coated on carrier, in coating load have noble metal, the coating includes tungsten-sial composite oxides and molecule
Sieve, the noble metal are the mixture of one or both of Pt, Pd substance, and the coated weight of the coating is 80-180 g/l,
The coated weight of the noble metal is 0.5-4.5 g/l.
Further, the mass ratio of the molecular sieve and tungsten-sial composite oxides is 1：2~10.
Further, the mass ratio of wolfram element and sial composite oxides is 1 in the tungsten-sial composite oxides：19
~99.
Further, silica quality fraction is 5~25wt% in the sial composite oxides, remaining is three oxidations
The sial of two aluminium.
Further, the molecular sieve is Hydrogen beta-molecular sieve.
Further, the carrier is cordierite ceramic honeycomb or iron-chromium-aluminum metal honeycomb, and the hole density of the carrier is
200-600 mesh/square feet.
The preparation method of diesel vehicle oxidation catalyst with low temperature active, includes the following steps：
(1) equi-volume impregnating prepares tungsten-sial composite oxides：By wolfram element and the mass ratio of sial composite oxides
For 1：19-99 weighs ammonium tungstate and sial composite oxides respectively, and ammonium tungstate water is prepared by the saturated extent of adsorption of silicon-aluminium compound
Solution, by prepared ammonium tungstate aqueous solution be added dropwise in sial composite oxides and continue stirring 2~8 it is small when, then stand,
It is dried after when ageing 6~15 is small under the conditions of 100~170 DEG C, and tungsten-sial combined oxidation is obtained after 350~550 DEG C of roastings
Object；
(2) preparation of coating slurry：It is 1 by the mass ratio of molecular sieve and tungsten-sial composite oxides：2~10 by tungsten-silicon
Aluminium composite oxide is added separately to stirring in deionized water with molecular sieve and forms slurries, tungsten-sial composite oxides and molecule
The gross mass of sieve and the mass ratio of deionized water are 2：3~8, slurries are then handled using ball-milling technology, it is 5- to control particle D90
40 μm, coating slurry is made；
(3) it is the requirement of 0.5-4.5 g/l of calculating noble metal according to the coated weight of noble metal on carrier, will contains expensive
The solution of one or both of Pt metal, Pd substance is added in coating slurry, is stirred evenly, and forms final slurries；
(4) carrier cordierite ceramic honeycomb or iron-chromium-aluminum metal honeycomb are immersed in final slurries, impregnate 0.5~5min
After take out, the passage of carrier inside blown using compressed air logical, purge time is 0.5~3min, then by carrier 100~
Under the conditions of 170 DEG C it is dry 3~8 it is small when, finally by carrier when roasting 2~3 is small under the conditions of 350~550 DEG C to get to diesel vehicle
Oxidation catalyst.
Preparation method of the present invention is simple, and step is easily operated, the diesel vehicle oxidation catalyst initiation temperature being prepared
Low, high conversion rate, thermal stability are good, have good oxidability to the HC in exhaust gas from diesel vehicle and CO, and with preferable
Sulfur resistive ability.Compared with traditional titania coating, the sial composite oxide coating that the present invention uses has higher phase transformation
Temperature and good thermal stability.
The acid sial composite oxides with large specific surface area and porous structure are used as coated substrate, by waiting bodies
Tungsten-sial composite oxides have been prepared in product infusion process, and acidity is further improved compared with sial composite oxides.In Pt
For in the catalyst oxidation reaction of main active component, the presence of Lewis-acid sites can inhibit the oxidation of Pt, and zero-valent state
Pt is the most active in the reaction, therefore the lewis acid for improving carrier can effectively promote catalyst activity.And the addition of wolfram element,
The Lewis-acid sites of sial composite oxides can further be increased, and then effectively promote catalyst coat performance.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated.
Embodiment 1：A kind of diesel vehicle oxidation catalyst with low temperature active, catalyst carrier are made pottery for cordierite honeycomb
Porcelain, volume are 1.101 liters, and hole density is 400 mesh/square feet；Contain tungsten-sial composite oxides and molecular sieve in coating,
Coating coated weight is 120 g/l；Noble metal is platinum, and the coated weight of noble metal platinum is 3.1 g/l.
Preparation method includes the following steps：
(1) equi-volume impregnating prepares tungsten-sial composite oxides：Tungsten-sial composite oxides use incipient impregnation
It is prepared by method.The mass fraction of dioxide-containing silica is 15% in used sial combined oxidation raw material, remaining is three oxidations
Two aluminium.The sial composite oxides that quality is 990 grams are weighed, 13.9 grams of ammonium tungstate dissolvings is weighed, it is compound to be configured to sial used
The aqueous solution of oxide saturated extent of adsorption, then ammonium tungstate solution is added dropwise in sial composite oxide powder and continues stirring 4
Hour；Then stand, be aged 10 it is small when, afterwards 120 DEG C drying 12 it is small when, 500 DEG C roasting 4 it is small when after obtain tungsten-sial
Composite oxides, in the tungsten being prepared-sial composite oxides, the mass ratio of wolfram element and sial composite oxides is 1：
99。
(2) 1400 grams of deionized water is weighed, adds in tungsten -800 grams of sial composite oxides, 200 grams of molecular sieve stirs evenly
Coating slurry is formed, control serous granule degree D90 is about 25 microns；
(3) continue that platinum nitrate is added in coating paste in whipping process, stir evenly, form final slurry.
(4) taken out after cordierite ceramic honeycomb matrix is impregnated 1 minute in this final slurry, it then will with compressed air
Extra slurries are blown down inside carrier surface and duct, and purge time is 2 minutes, and it is small to be subsequently placed in baking oven at 120 DEG C dry 2
When, to get to diesel oxidation catalyst when roasting 2 is small at 500 DEG C in Muffle furnace.
Comparative example：Tungsten in coating-sial composite oxides are changed into tungsten-silicon-titanium coating, preparation method and embodiment
1 is identical, and using identical cordierite ceramic honeycomb carrier, identical coated weight, the identical diesel oil of bullion content has been prepared
Vehicle oxidation catalyst.
Embodiment 2：
Specific preparation method and example 1 are essentially identical, the difference is that, in tungsten used-sial composite oxides, tungsten member
The mass ratio of element and sial composite oxides is 1：39.
Embodiment 3：
Specific preparation method and example 1 are essentially identical, the difference is that, in tungsten used-sial composite oxides, tungsten member
The mass ratio of element and sial composite oxides is 1：19.
Embodiment 4：
Specific preparation method and example 1 are essentially identical, the difference is that, the sial combined oxidation used in oxide raw material
The sial composite oxides that object is 25% for the fraction of quality containing silica.
Embodiment 5：
Specific preparation method and example 1 are essentially identical, the difference is that, oxide raw material used is containing siliceous
The sial composite oxides that fraction is 25% are measured, and in tungsten used-sial composite oxides, wolfram element and sial combined oxidation
The mass ratio of object is 1：39.
Embodiment 6：
Specific preparation method and example 1 are essentially identical, the difference is that, oxide raw material used is containing siliceous
The sial composite oxides that fraction is 25% are measured, and in tungsten used-sial composite oxides, wolfram element and sial combined oxidation
The mass ratio of object is 1：19.
Embodiment 7：A kind of diesel vehicle oxidation catalyst with low temperature active, catalyst carrier are iron-chromium-aluminum metal bee
Nest, volume are 1.101 liters, and hole density is 200 mesh/square feet；Contain tungsten-sial composite oxides and molecular sieve in coating,
Coating coated weight is 80 g/l；Noble metal is platinum, and the coated weight of noble metal platinum is 0.5 g/l.
Preparation method includes the following steps：
(1) equi-volume impregnating prepares tungsten-sial composite oxides：Tungsten-sial composite oxides use incipient impregnation
It is prepared by method.The mass fraction of dioxide-containing silica is 5% in used sial combined oxidation raw material, remaining is three oxidations two
Aluminium.The sial composite oxides that quality is 990 grams are weighed, 13.9 grams of ammonium tungstate dissolvings is weighed, is configured to sial composite oxygen used
The aqueous solution of compound saturated extent of adsorption, then ammonium tungstate solution is added dropwise in sial composite oxide powder and to continue stirring 2 small
When；Then stand, be aged 10 it is small when, afterwards when 100 DEG C of drying 12 are small, when 500 DEG C of roastings 4 are small after to obtain tungsten-sial multiple
Oxide is closed, in the tungsten being prepared-sial composite oxides, the mass ratio of wolfram element and sial composite oxides is 1：99.
(2) 1400 grams of deionized water is weighed, adds in tungsten -400 grams of sial composite oxides, 200 grams of molecular sieve stirs evenly
Coating slurry is formed, control serous granule degree D90 is about 5 microns；
(3) continue that platinum nitrate is added in coating paste in whipping process, stir evenly, form final slurry.
(4) taken out after cordierite ceramic honeycomb matrix is impregnated 0.5 minute in this final slurry, then use compressed air
Slurries extra inside carrier surface and duct are blown down, purge time is 2 minutes, is subsequently placed in baking oven at 100 DEG C dry 3
Hour, to get to diesel oxidation catalyst when roasting 3 is small at 350 DEG C in Muffle furnace.
Embodiment 8：A kind of diesel vehicle oxidation catalyst with low temperature active, catalyst carrier are made pottery for cordierite honeycomb
Porcelain, volume are 1.101 liters, and hole density is 600 mesh/square feet；Contain tungsten-sial composite oxides and molecular sieve in coating,
Coating coated weight is 180 g/l；Noble metal is platinum, and the coated weight of noble metal platinum is 4.5 g/l.
Preparation method includes the following steps：
(1) equi-volume impregnating prepares tungsten-sial composite oxides：Tungsten-sial composite oxides use incipient impregnation
It is prepared by method.The mass fraction of dioxide-containing silica is 15% in used sial combined oxidation raw material, remaining is three oxidations
Two aluminium.The sial composite oxides that quality is 990 grams are weighed, 13.9 grams of ammonium tungstate dissolvings is weighed, it is compound to be configured to sial used
The aqueous solution of oxide saturated extent of adsorption, then ammonium tungstate solution is added dropwise in sial composite oxide powder and continues stirring 8
Hour；Then stand, be aged 6 it is small when, afterwards when 170 DEG C of drying 12 are small, when 550 DEG C of roastings 4 are small after to obtain tungsten-sial multiple
Oxide is closed, in the tungsten being prepared-sial composite oxides, the mass ratio of wolfram element and sial composite oxides is 1：99.
(2) 1400 grams of deionized water is weighed, adds in tungsten -2000 grams of sial composite oxides, 200 grams of molecular sieve, stirring is
Even formation coating slurry, control serous granule degree D90 is about 40 microns；
(3) continue that platinum nitrate is added in coating paste in whipping process, stir evenly, form final slurry.
(4) cordierite ceramic honeycomb matrix in this final slurry is impregnated and taken out after five minutes, it then will with compressed air
Extra slurries are blown down inside carrier surface and duct, and purge time is 3 minutes, and it is small to be subsequently placed in baking oven at 170 DEG C dry 2
When, to get to diesel oxidation catalyst when roasting 2 is small at 550 DEG C in Muffle furnace.
Performance evaluation is carried out to catalyst prepared by embodiment 1-6：
The catalyst sample being prepared is subjected to laboratory simulation distribution evaluation, distribution component list is as shown in table 1.In sample
During judging valency, electric furnace temperature programming is controlled by temperature controller, by HC analyzers, CO analyzers and SO2Analyzer measurement reaction
The concentration of front and rear gas each component, obtains the conversion ratio of sample under different temperatures, and thus obtains the T50 of sample (conversion ratio is
Temperature when 50%).The T50 temperature of HC and CO is lower, shows that the catalytic performance of catalyst is better；And SO2T50 temperature get over
Height then shows that the sulfur resistive ability of catalyst is better.
1 diesel vehicle of table simulation distribution composition
| Gas | Content | Gas | Content |
| HC(C3H8) | 200ppm | O2 | 10% |
| NO | 300ppm | SO2 | 50ppm |
| CO | 500ppm | H2O | 10% |
| CO2 | 6% | N2 | Remaining nitrogen |
T50 (HC, CO, SO of 2 catalyst of table2)
| Sample | HC T50(℃) | CO T50(℃) |
| 1 | 229 | 103 |
| 2 | 212 | 101 |
| 3 | 235 | 110 |
| 4 | 215 | 104 |
| 5 | 203 | 98 |
| 6 | 227 | 112 |
| Comparative example | 232 | 110 |
The T50-aged (HC, CO) of 3 aging state catalyst of table
| Sample | HC T50-aged(℃) | CO T50-aged(℃) |
| 1 | 279 | 132 |
| 2 | 261 | 129 |
| 3 | 282 | 138 |
| 4 | 264 | 131 |
| 5 | 252 | 125 |
| 6 | 278 | 139 |
| Comparative example | 321 | 152 |
As shown in Table 2, the T50 of the HC and CO of the diesel vehicle oxidation catalyst obtained using the preparation method in the present invention
Temperature is relatively low, and the T50 temperature of the especially HC and CO of diesel vehicle oxidation catalyst prepared by embodiment 5 reach minimum and is respectively
203 DEG C and 98 DEG C, and SO2T50Temperature is 349 DEG C, shows that the catalyst has preferable sulfur resistive ability.
As shown in Table 3, the diesel vehicle oxidation catalyst aging state property obtained using the preparation method in the present invention can be with
Comparative example is compared to being obviously improved, and wherein the HC-T50 of diesel vehicle oxidation catalyst prepared by embodiment 5 is reduced compared with comparative example
69 DEG C.
Claims (4)
1. a kind of diesel vehicle oxidation catalyst with low temperature active, it is characterised in that：It is applied including carrier and on carrier
The coating covered, in coating load have noble metal, the coating includes tungsten-sial composite oxides and molecular sieve, the noble metal
For the mixture of one or both of Pt, Pd substance, the coated weight of the coating is 80-180 g/l, the noble metal
Coated weight for 0.5-4.5 g/l, the mass ratio of the molecular sieve and tungsten-sial composite oxides is 1：2~10, the tungsten-
The mass ratio of wolfram element and sial composite oxides is 1 in sial composite oxides：19~99, in the sial composite oxides
Silica quality fraction is 5~25wt%, remaining is alundum (Al2O3).
2. there is the diesel vehicle oxidation catalyst of low temperature active as described in claim 1, it is characterised in that：The molecular sieve
For Hydrogen beta-molecular sieve.
3. there is the diesel vehicle oxidation catalyst of low temperature active as described in claim 1, it is characterised in that：The carrier is
Cordierite ceramic honeycomb or iron-chromium-aluminum metal honeycomb, the hole density of the carrier is 200-600 mesh/square feet.
4. the preparation method of the diesel vehicle oxidation catalyst with low temperature active as described in claim 1, it is characterised in that：
Include the following steps：
（1）Equi-volume impregnating prepares tungsten-sial composite oxides：It is 1 by the mass ratio of wolfram element and sial composite oxides：
19-99 weighs ammonium tungstate and sial composite oxides respectively, and ammonium tungstate aqueous solution is prepared by the saturated extent of adsorption of silicon-aluminium compound,
By prepared ammonium tungstate aqueous solution be added dropwise in sial composite oxides and continue stirring 2~8 it is small when, then stand, be aged 6
~15 it is small when after dried under the conditions of 100~170 DEG C, and in 350~550 DEG C roasting after obtain tungsten-sial composite oxides；
（2）The preparation of coating slurry：It is 1 by the mass ratio of molecular sieve and tungsten-sial composite oxides：2~10 is multiple by tungsten-sial
It closes oxide and molecular sieve and is added separately to stirring in deionized water and forms slurries, tungsten-sial composite oxides and molecular sieve
The mass ratio of gross mass and deionized water is 2：3~8, slurries are then handled using ball-milling technology, it is 5-40 μ to control particle D90
Coating slurry is made in m；
（3）It is the requirement of 0.5-4.5 g/l of calculating noble metal according to the coated weight of noble metal on carrier, noble metal will be contained
The solution of one or both of Pt, Pd substance is added in coating slurry, is stirred evenly, and forms final slurries；
（4）Carrier cordierite ceramic honeycomb or iron-chromium-aluminum metal honeycomb are immersed in final slurries, taken after impregnating 0.5~5min
Go out, blown the passage of carrier inside using compressed air logical, purge time is 0.5~3min, then by carrier 100~170
Under the conditions of DEG C it is dry 3~8 it is small when, finally by carrier when roasting 2~3 is small under the conditions of 350~550 DEG C to get to diesel vehicle oxygen
Change type catalyst.
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| CN106362792B (en) * | 2016-08-26 | 2019-06-04 | 江苏万路达环保科技有限公司 | A kind of reparation of light-duty diesel vehicle oxidation catalyst slurry, preparation method and applications |
| CN106807432A (en) * | 2017-02-06 | 2017-06-09 | 无锡威孚环保催化剂有限公司 | A kind of Pt Pd bimetallic catalysts for NO oxidations and preparation method thereof |
| CN106902865B (en) * | 2017-02-13 | 2019-09-03 | 无锡威孚环保催化剂有限公司 | Diesel vehicle particle oxidative catalyst and preparation method thereof |
| CN106902864A (en) * | 2017-03-09 | 2017-06-30 | 无锡威孚环保催化剂有限公司 | A kind of ammoxidation catalyst for diesel engine vent gas cleaning system and preparation method thereof |
| CN106823592B (en) * | 2017-03-15 | 2019-07-05 | 四川绵阳华元航升环保科技有限公司 | A kind of preparation method of light-duty diesel vehicle type oxide particle trap |
| CN111330633B (en) * | 2020-03-10 | 2023-05-30 | 无锡威孚环保催化剂有限公司 | Diesel vehicle oxidation catalyst with low-temperature adsorption capacity and preparation method thereof |
| CN115555013B (en) * | 2022-10-24 | 2023-11-14 | 华中师范大学 | Pt/silicon modified alumina-based catalyst and preparation method and application thereof |
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| CN101530787A (en) * | 2009-04-13 | 2009-09-16 | 无锡威孚环保催化剂有限公司 | Oxidation catalyst for purifying tail gas of diesel vehicles and preparation method thereof |
| CN102869431A (en) * | 2010-06-30 | 2013-01-09 | 恩亿凯嘉股份有限公司 | Flue gas-cleaning device and flue gas-cleaning method that use selective catalytic reduction catalyst |
| CN102631917A (en) * | 2012-04-09 | 2012-08-15 | 福州大学 | Oxidation catalyst for purifying tail gas of diesel vehicle and preparation method for oxidation catalyst |
| CN103752338A (en) * | 2014-02-08 | 2014-04-30 | 无锡威孚力达催化净化器有限责任公司 | Preparation method for oxidation catalyst used for purifying diesel exhaust |
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