CN109603823A - The lean-burn NO of diesel engine vent gas purification systemxTrap catalyst and preparation method thereof - Google Patents

The lean-burn NO of diesel engine vent gas purification systemxTrap catalyst and preparation method thereof Download PDF

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CN109603823A
CN109603823A CN201910019907.5A CN201910019907A CN109603823A CN 109603823 A CN109603823 A CN 109603823A CN 201910019907 A CN201910019907 A CN 201910019907A CN 109603823 A CN109603823 A CN 109603823A
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catalyst
lean
slurries
burn
oxide
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CN109603823B (en
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王秀庭
侯富华
张元�
董铭鑫
王刚
柯峰
杨金
吕衍安
郝士杰
金炜阳
张云
岳军
贾莉伟
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Wuxi Weifu Environmental Protection Catalyst Co Ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
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    • 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
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D2255/1023—Palladium
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    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
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    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/204—Alkaline earth metals
    • B01D2255/2042—Barium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals
    • B01D2255/2065—Cerium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/20715—Zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D2255/20—Metals or compounds thereof
    • B01D2255/209—Other metals
    • B01D2255/2092—Aluminium
    • 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
    • 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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Abstract

The present invention relates to a kind of lean-burn NO of diesel engine vent gas purification systemxTrap catalyst, is coated with bottom catalyst coat on the surface of catalyst carrier, is coated with overlying catalyst coating on the surface of bottom catalyst coat；Corresponding every liter of catalyst carrier includes the composite oxides of 200 ~ 300g, the barium monoxide of 10 ~ 30g, the precious metals pt of 1.0 ~ 3.0g and the precious metals pd of 0.4 ~ 0.7g in bottom catalyst coat；Corresponding every liter of catalyst carrier, includes composite oxides, the precious metals pt of 0.6 ~ 1.0g and the noble metal Rh of 0.15 ~ 0.25g of 30 ~ 60g in overlying catalyst coating；Composite oxides include ceria, aluminium oxide and other oxides；And other oxides are at least one of magnesia, zirconium oxide or lanthana.The present invention can not only the oxidizing fire hydro carbons (HC) and carbon monoxide (CO) that not exclusively generate, moreover it is possible to trapping and nitrogen oxides reduction (NOx).

Description

The lean-burn NO of diesel engine vent gas purification systemxTrap catalyst and preparation method thereof
Technical field
The invention discloses a kind of lean-burn NO of diesel engine vent gas purification systemxTrap catalyst, the invention also discloses A kind of lean-burn NOxThe preparation method of trap catalyst, the invention belongs to diesel motor exhaust cleaning catalyst technical fields.
Background technique
Diesel engine has fuel economy higher and CO as a kind of lean-burn automotive2The low advantage of discharge amount, makes Diesel vehicle is especially more more and more universal in Europe in most of developed countries.But compared with stoichiometric gasoline engine, The soot and NO of emission of diesel enginexIt is more, therefore the censure by vast public opinion.Diesel car engine is transported under lean-burn condition It goes, the air-fuel ratio in tail gas is much larger than 14.7, and the clean-up effect of three-effect catalysis technology is unable to satisfy requirement in this case.At present Applied to NO in exhaust gas from diesel vehiclexThe selective catalytic reduction technique of the mainstream technology of catalytic purification (SCR), lean-burn NOx trap Technology (LNT) etc..
On the other hand, i.e., state's VI discharge standard of implementation is greatly reduced to the emission limit of NOx again, this is for diesel oil Engine emission reduction work constitutes great challenge.For light-duty small displacement diesel engine, since cold start-up and idling etc. are low The lower NO discharged of temperaturexIt can not be handled by SCR catalyst, therefore LNT is considered to have a kind of NO of Research ProspectsxCatalysis is net Change post-processing technology.Compared to other techniques, LNT technology biggest advantage is not need additionally to add reducing agent, utilizes absorption Memory technology has well solved low temperature NOxAnd the emission problem of unburned HC.LNT is the process of a cycle circulation, The lean-burn stage is usually 1-2min in systems in practice, and the fuel-rich stage is 3-5s.In longer lean-burn stage (λ > 1), NOxFirst It is adsorbed on catalyst surface, is then stored in the form of nitrite or nitrate on a catalyst, when reaction atmosphere switches To of short duration fuel-rich stage (λ < 1), the NO of catalyst desorptionxBy H2, the reducibility gas such as CO, HC be reduced to N2Equal gases, and make Catalyst is regenerated, and the circulation of next round is then proceeded by.
If CN102614875A discloses a kind of LNT catalyst applied for combining LNT-SCR, LNT catalyst is with firefly The proton conductive oxide of stone structure, i.e. based on Ca (Sr)-La-Ce (Zr, Pr) mixed oxide, and further with Pt-Pd Or Pt-Pd-Rh noble metal component combines.But even if these catalyst under low-speed (volume space velocity 10,000h-1), NOx is not completely converted.
If CN102688691A discloses a kind of LNT catalyst that manganese-base oxide promotes, using containing MnOxBase metal Oxide mixture (such as MnOx-CeO2) instead of the platinum in LNT system, with NOxStorage material and NOxReducing material combination makes With.But these catalyst equally exist NOxThe low problem of transformation efficiency.
Therefore, lean-burn NOxThe NOx purifying property of trap catalyst is there is still a need for improving, to realize high NOxTransformation efficiency.
Summary of the invention
An object of the present invention is to overcome the deficiencies in the prior art, provide one kind can oxidizing fire it is incomplete The hydro carbons (HC) and carbon monoxide (CO) of generation can simultaneously trap and nitrogen oxides reduction (NOx) diesel engine vent gas purification system Lean-burn NOxTrap catalyst.
It is a further object of the present invention to provide a kind of lean-burn NO of diesel engine vent gas purification systemxThe preparation of trap catalyst Method.
According to technical solution provided by the invention, the lean-burn NO of the diesel engine vent gas purification systemxTrap catalyst, The surface of catalyst carrier is coated with bottom catalyst coat, applies on the surface of bottom catalyst coat coated with overlying catalyst Layer；Corresponding every liter of catalyst carrier, the oxygen of composite oxides, 10~30g in bottom catalyst coat comprising 200~300g Change barium, the precious metals pt of 1.0~3.0g and the precious metals pd of 0.4~0.7g；Corresponding every liter of catalyst carrier, in overlying catalyst It include composite oxides, the precious metals pt of 0.6~1.0g and the noble metal Rh of 0.15~0.25g of 30~60g in coating；
The composite oxides include ceria, aluminium oxide and other oxides；And other oxides are magnesia, oxygen Change at least one of zirconium or lanthana.
As preferred: the catalyst carrier is that cordierite honeycomb ceramic or iron-chromium-aluminum metal honeycomb, hole density exist 100-600 mesh/square inch.
As preferred: in the composite oxides, the weight ratio of ceria, aluminium oxide and other oxides is (3- 6):(3-6):(0.1-2)。
A kind of lean-burn NO of diesel engine vent gas purification systemxThe preparation method of trap catalyst the following steps are included:
A, at least one of magnesium nitrate, zirconium nitrate or lanthanum nitrate are impregnated on aluminium oxide together with cerous nitrate, it is quiet It sets 8~12 hours, is then dried at 120~140 DEG C 7~9 hours, finally roast 2~3 hours, obtain at 500~600 DEG C Mixed oxide；
B, the mixture that step a is obtained is weighed as required, and the presoma of mixed oxide, barium monoxide is added to deionization In water, stir evenly, formed slurries, institute weighed mixed oxide quality and deionized water quality ratio be (1~2): 3, the slurries are handled with ball-milling technology, granularity D90 is controlled at 10 μm, platinum nitrate solution and nitric acid is added in the slurries Slurries are all coated in catalyst carrier by palladium solution after mixing evenly, 8~12 hours dry at 120~140 DEG C, most It is roasted 2~3 hours at 500~600 DEG C afterwards, is covered with bottom catalyst coat so that applying on the surface of catalyst carrier；
C, the mixed oxide that step a is obtained is weighed as required, mixed oxide is add to deionized water, and stirring is equal It is even, formed slurries, the quality of the deionized water and institute the quality of weighed mixed oxide ratio be (1~2): 3；Through ball milling Make 10 μm of granularity D90 of slurries, platinum nitrate solution and rhodium nitrate solution is then added in the slurries, after mixing evenly Slurries are all coated to by bottom catalyst coat made from step b, are dried 7~9 hours at 120~140 DEG C, 500~600 DEG C roast 2~3 hours to get lean-burn NOx trap catalyst is arrived.
As preferred: the presoma of the barium monoxide is barium acetate or barium hydroxide.
The present invention can not only the oxidizing fire hydro carbons (HC) and carbon monoxide (CO) that not exclusively generate, moreover it is possible to trapping and also Former nitrogen oxides (NOx)。
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Embodiment 1
A kind of lean-burn NO of diesel engine vent gas purification systemxTrap catalyst, catalyst carrier are carrier cordierite ceramic, The volume of catalyst carrier is 0.73L, and the hole density of catalyst carrier is 400 mesh/square inch；On the surface of catalyst carrier Coated with bottom catalyst coat, overlying catalyst coating is coated on the surface of bottom catalyst coat；Corresponding every liter of catalysis Agent carrier aoxidizes in bottom catalyst coat comprising cerium-magnesium-aluminum complex oxide comprising 227.3 grams per liters, 20 grams per liters Barium, 2.25 grams per liter Pt and 0.45 grams per liter Pd；Corresponding every liter of catalyst carrier, in overlying catalyst coating comprising 49.1 grams/ Cerium-magnesium-aluminum complex oxide, 0.72 grams per liter Pt and the 0.18 grams per liter Rh risen；And the weight of cerium oxide, magnesia and aluminium oxide Than for 4:1:5.
The lean-burn NO of above-mentioned diesel engine vent gas purification systemxTrap catalyst the preparation method is as follows:
A, it is small that 8 are then allowed to stand by magnesium nitrate and cerous nitrate co-impregnation to aluminium oxide using the method for incipient impregnation When, it dries 7 hours at 120 DEG C, obtains mixed oxide after last 500 DEG C of roastings 2 hours；
B, the mixed oxide that step a is obtained is weighed as required, and weighed mixed oxide, barium acetate are added to 380g It in deionized water, stirring evenly, forms slurries, handle the slurries with ball-milling technology, granularity D90 is at 10 μm or so for control, Then platinum nitrate solution and palladium nitrate solution are added in the slurries, slurries are all coated to catalyst load after mixing evenly 8 hours dry at 120 DEG C on body, 500 DEG C roast 2 hours, are covered with bottom catalyst so that applying on the surface of catalyst carrier Coating；
C, the mixed oxide that step a is obtained is weighed as required and is added in 143.4g deionized water, is stirred evenly, shape At slurries；Make 10 μm of granularity D90 or so of slurries through ball milling, platinum nitrate solution and nitric acid are then added in the slurries Slurries are coated on bottom catalyst coat by rhodium solution after mixing evenly, 7 hours dry at 120 DEG C, and 500 DEG C of roastings 2 are small When, so that overlying catalyst coating is formed on bottom catalyst coat to get lean-burn NO is arrivedxTrap catalyst.
Embodiment 2
A kind of lean-burn NO of diesel engine vent gas purification systemxTrap catalyst, catalyst carrier are carrier cordierite ceramic, The volume of catalyst carrier is 0.73L, and the hole density of catalyst carrier is 100 mesh/square inch；On the surface of catalyst carrier Coated with bottom catalyst coat, overlying catalyst coating is coated on the surface of bottom catalyst coat；Corresponding every liter of catalysis Agent carrier aoxidizes in bottom catalyst coat comprising cerium-zirconium-lanthanum-aluminium composite oxide comprising 227 grams per liters, 20 grams per liters Barium, 2.25 grams per liter Pt and 0.45 grams per liter Pd；Corresponding every liter of catalyst carrier includes 50 grams per liters in overlying catalyst coating Cerium-zirconium-lanthanum-aluminium composite oxide, 0.72 grams per liter Pt and 0.18 grams per liter Rh；And cerium oxide, zirconium oxide, lanthana and oxidation The weight ratio of aluminium is 3:0.05:0.05:3.
The lean-burn NO of above-mentioned diesel engine vent gas purification systemxTrap catalyst the preparation method is as follows:
A, then quiet by zirconium nitrate, lanthanum nitrate and cerous nitrate co-impregnation to aluminium oxide using the method for incipient impregnation It sets and is dried 8 hours at 10 hours, 130 DEG C, obtain mixed oxide after last 550 DEG C of roastings 2.5 hours；
B, the mixed oxide that step a is obtained is weighed as required, and weighed mixed oxide, barium hydroxide are added to It in 380g deionized water, stirs evenly, forms slurries, handle the slurries with ball-milling technology, control granularity D90 on 10 μm of left sides Then platinum nitrate solution and palladium nitrate solution are added in the slurries, slurries are all coated to catalysis after mixing evenly for the right side 10 hours dry at 130 DEG C on agent carrier, 550 DEG C roast 2.5 hours, are covered with bottom so that applying on the surface of catalyst carrier Layer catalyst coat；
C, the mixed oxide that step a is obtained is weighed as required and is added in 143g deionized water, is stirred evenly, and is formed Slurries；Make 10 μm of granularity D90 or so of slurries through ball milling, platinum nitrate solution and rhodium nitrate are then added in the slurries Slurries are coated on bottom catalyst coat by solution after mixing evenly, 8 hours dry at 130 DEG C, and 550 DEG C of roastings 2.5 are small When, so that overlying catalyst coating is formed on bottom catalyst coat to get lean-burn NO is arrivedxTrap catalyst.
Embodiment 3
A kind of lean-burn NO of diesel engine vent gas purification systemxTrap catalyst, catalyst carrier are carrier cordierite ceramic, The volume of catalyst carrier is 0.73L, and the hole density of catalyst carrier is 600 mesh/square inch；On the surface of catalyst carrier Coated with bottom catalyst coat, overlying catalyst coating is coated on the surface of bottom catalyst coat；Corresponding every liter of catalysis Agent carrier includes cerium-magnesium-zirconium-lanthanum-aluminium composite oxide, 20 grams per liter oxygen comprising 227 grams per liters in bottom catalyst coat Change barium, 2.25 grams per liter Pt and 0.45 grams per liter Pd；Corresponding every liter of catalyst carrier, in overlying catalyst coating comprising 50 grams/ Cerium-magnesium-lanthanum-aluminium composite oxide, 0.72 grams per liter Pt and the 0.18 grams per liter Rh risen；And cerium oxide, magnesia, zirconium oxide, oxygen The weight ratio for changing lanthanum and aluminium oxide is 6:0.06:0.06:0.08:6.
The lean-burn NO of above-mentioned diesel engine vent gas purification systemxTrap catalyst the preparation method is as follows:
A, using the method for incipient impregnation, by magnesium nitrate, zirconium nitrate, lanthanum nitrate and cerous nitrate co-impregnation to aluminium oxide On, it is then allowed to stand at 12 hours, 140 DEG C and dries 9 hours, obtain mixed oxide after last 600 DEG C of roastings 3 hours；
B, the mixed oxide that step a is obtained is weighed as required, and weighed mixed oxide, barium acetate are added to 380g It in deionized water, stirring evenly, forms slurries, handle the slurries with ball-milling technology, granularity D90 is at 10 μm or so for control, Then platinum nitrate solution and palladium nitrate solution are added in the slurries, slurries are all coated to catalyst load after mixing evenly 12 hours dry at 140 DEG C on body, 600 DEG C roast 3 hours, are covered with bottom catalysis so that applying on the surface of catalyst carrier Agent coating；
C, the mixed oxide that step a is obtained is weighed as required and is added in 143g deionized water, is stirred evenly, and is formed Slurries；Make 10 μm of granularity D90 or so of slurries through ball milling, platinum nitrate solution and rhodium nitrate are then added in the slurries Slurries are coated on bottom catalyst coat by solution after mixing evenly, 9 hours dry at 140 DEG C, and 600 DEG C of roastings 3 are small When, so that overlying catalyst coating is formed on bottom catalyst coat to get lean-burn NO is arrivedxTrap catalyst.
NOxTransformation efficiency evaluation
Carry out 20 lean combustions/fuel-rich switching circulation NO respectively at 150,200,250,300,350,400 DEG CxTransformation efficiency It evaluates, includes 250ppm NO, 10%O in lean-burn atmosphere2、1000ppm CO、300ppm C3H6, 5%H2O, 5%CO2, use N2 As Balance Air, duration 100s；Fuel-rich atmosphere includes 250ppm NO, 0.5%O2, 3%CO, 0.5%H2、900ppm C3H6, 5%H2O, 5%CO2, N2As Balance Air, duration 10s.Volume space velocity is 80,000h-1.Use Fourier transform Infrared spectroscopy (FTIR) analyzer detection outlet production concentration, thus calculates the average NO of 20 circulationsxTransformation efficiency.
Table 1 describes average NO of the 1-3 of the embodiment of the present invention under lean combustion/fuel-rich switching cycling conditionxTransformation efficiency. At 150 and 200 DEG C, the NO of 3 embodimentsxConversion ratio is suitable, and respectively 17% and 78% or so；In 250-400 DEG C of temperature model In enclosing, the NO of embodiment 1xConversion ratio highest, followed by embodiment 3, and in this temperature range, the NO of embodiment 1xConversion ratio All 80% or more.Evaluation result shows to use cerium-magnesium-aluminum complex oxide as carrier to NOxConversion performance is better than use Cerium-zirconium-aluminium composite oxide is as carrier；Compared to barium hydroxide, barium acetate is used to be conducive to mention as oxidation barium precursor Rise the high temperature NO of LNT catalystxTransformation efficiency.
Table 1
NOxConversion ratio/% Embodiment 1 Embodiment 2 Embodiment 3
150℃ 16.0 17.6 16.9
200℃ 77.6 78.3 79.3
250℃ 91.1 87.8 91.6
300℃ 92.1 86.9 90.8
350℃ 89.9 74.4 85.5
400℃ 81.2 69.9 72.0

Claims (5)

1. a kind of lean-burn NO of diesel engine vent gas purification systemxTrap catalyst, it is characterized in that: being applied on the surface of catalyst carrier It is covered with bottom catalyst coat, is coated with overlying catalyst coating on the surface of bottom catalyst coat；Corresponding every liter of catalyst Carrier, in bottom catalyst coat comprising the composite oxides of 200 ~ 300g, the barium monoxide of 10 ~ 30g, 1.0 ~ 3.0g your gold Belong to the precious metals pd of Pt and 0.4 ~ 0.7g；Corresponding every liter of catalyst carrier, the answering comprising 30 ~ 60g in overlying catalyst coating Close oxide, the precious metals pt of 0.6 ~ 1.0g and the noble metal Rh of 0.15 ~ 0.25g；
The composite oxides include ceria, aluminium oxide and other oxides；And other oxides are magnesia, zirconium oxide Or at least one of lanthana.
2. the lean-burn NO of diesel engine vent gas purification system as described in claim 1xTrap catalyst, it is characterized in that: the catalysis Agent carrier is cordierite honeycomb ceramic or iron-chromium-aluminum metal honeycomb, and hole density is in 100-600 mesh/square inch.
3. the lean-burn NO of diesel engine vent gas purification system as described in claim 1xTrap catalyst, it is characterized in that: described multiple It closes in oxide, the weight ratio of ceria, aluminium oxide and other oxides is (3-6): (3-6): (0.1-2).
4. a kind of lean-burn NO of diesel engine vent gas purification systemxThe preparation method of trap catalyst the following steps are included:
A, at least one of magnesium nitrate, zirconium nitrate or lanthanum nitrate are impregnated on aluminium oxide together with cerous nitrate, standing 8 ~ It 12 hours, is then dried at 120 ~ 140 DEG C 7 ~ 9 hours, is finally roasted 2 ~ 3 hours at 500 ~ 600 DEG C, obtain mixed oxidization Object；
B, the mixed oxide that step a is obtained is weighed as required, and the presoma of mixed oxide, barium monoxide is added to deionization In water, stir evenly, formed slurries, institute weighed mixed oxide quality and deionized water quality ratio be (1 ~ 2): 3, The slurries are handled with ball-milling technology, granularity D90 is controlled at 10 μm, platinum nitrate solution and palladium nitrate is added in the slurries Slurries are all coated in catalyst carrier by solution after mixing evenly, 8 ~ 12 hours dry at 120 ~ 140 DEG C, are finally existed It is roasted 2 ~ 3 hours at 500 ~ 600 DEG C, is covered with bottom catalyst coat so that applying on the surface of catalyst carrier；
C, the mixed oxide that step a is obtained is weighed as required, and mixed oxide is add to deionized water, is stirred evenly, Formed slurries, institute weighed mixed oxide quality and deionized water quality ratio be (1 ~ 2): 3, make slurries through ball milling Granularity D90 is 10 μm, platinum nitrate solution and rhodium nitrate solution is then added in the slurries, after mixing evenly by slurries It is all coated to by bottom catalyst coat made from step b, is dried 7 ~ 9 hours at 120 ~ 140 DEG C, at 500 ~ 600 DEG C 2 ~ 3 hours are roasted to get lean-burn NOx trap catalyst is arrived.
5. the lean-burn NO of diesel engine vent gas purification system as claimed in claim 4xThe preparation method of trap catalyst, feature Be: the presoma of the barium monoxide is barium acetate or barium hydroxide.
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CN110075836A (en) * 2019-05-29 2019-08-02 上海歌地催化剂有限公司 Lean-burn NOx trap catalyst
CN110201707A (en) * 2019-05-17 2019-09-06 昆明贵研催化剂有限责任公司 For the NO under equivalent combustion interval hyperoxia operating conditionxThree-effect catalyst for purifying and preparation method thereof
CN111939906A (en) * 2020-08-26 2020-11-17 无锡威孚环保催化剂有限公司 Lean-burn NOx trapping catalyst
CN112221494A (en) * 2020-11-11 2021-01-15 中自环保科技股份有限公司 Pt-containing catalyst suitable for gasoline vehicle tail gas purification and preparation method thereof
CN113600188A (en) * 2021-08-10 2021-11-05 无锡威孚环保催化剂有限公司 Catalyst for purifying tail gas of gasoline vehicle and preparation method thereof
CN113750996A (en) * 2021-09-29 2021-12-07 无锡威孚环保催化剂有限公司 Catalyst for enhancing internal combustion engine tail gas purification and preparation method thereof
CN114870860A (en) * 2022-04-14 2022-08-09 中自环保科技股份有限公司 Natural gas vehicle tail gas purification catalyst and preparation method thereof
CN115445613A (en) * 2022-08-11 2022-12-09 凯龙蓝烽新材料科技有限公司 Coating for lean-burn CNG catalyst and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101610844A (en) * 2006-11-29 2009-12-23 巴斯福催化剂公司 The NO of resistant to thermal aging xStorage material and trap
CN105934274A (en) * 2014-01-23 2016-09-07 庄信万丰股份有限公司 Diesel oxidation catalyst and exhaust system
CN106457215A (en) * 2014-03-21 2017-02-22 巴斯夫公司 Integrated LNT-TWC catalyst
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
CN107735161A (en) * 2015-03-03 2018-02-23 巴斯夫公司 NOxAdsorber catalyst, method and system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101610844A (en) * 2006-11-29 2009-12-23 巴斯福催化剂公司 The NO of resistant to thermal aging xStorage material and trap
CN105934274A (en) * 2014-01-23 2016-09-07 庄信万丰股份有限公司 Diesel oxidation catalyst and exhaust system
CN106457215A (en) * 2014-03-21 2017-02-22 巴斯夫公司 Integrated LNT-TWC catalyst
CN107735161A (en) * 2015-03-03 2018-02-23 巴斯夫公司 NOxAdsorber catalyst, method and system
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

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110201707A (en) * 2019-05-17 2019-09-06 昆明贵研催化剂有限责任公司 For the NO under equivalent combustion interval hyperoxia operating conditionxThree-effect catalyst for purifying and preparation method thereof
CN110075836A (en) * 2019-05-29 2019-08-02 上海歌地催化剂有限公司 Lean-burn NOx trap catalyst
CN111939906A (en) * 2020-08-26 2020-11-17 无锡威孚环保催化剂有限公司 Lean-burn NOx trapping catalyst
CN112221494A (en) * 2020-11-11 2021-01-15 中自环保科技股份有限公司 Pt-containing catalyst suitable for gasoline vehicle tail gas purification and preparation method thereof
CN112221494B (en) * 2020-11-11 2023-10-20 中自环保科技股份有限公司 Pt-containing catalyst suitable for purifying tail gas of gasoline vehicle and preparation method thereof
CN113600188A (en) * 2021-08-10 2021-11-05 无锡威孚环保催化剂有限公司 Catalyst for purifying tail gas of gasoline vehicle and preparation method thereof
CN113600188B (en) * 2021-08-10 2023-05-30 无锡威孚环保催化剂有限公司 Catalyst for purifying tail gas of gasoline car and preparation method thereof
CN113750996A (en) * 2021-09-29 2021-12-07 无锡威孚环保催化剂有限公司 Catalyst for enhancing internal combustion engine tail gas purification and preparation method thereof
CN113750996B (en) * 2021-09-29 2023-10-20 无锡威孚环保催化剂有限公司 Catalyst for enhancing purification of tail gas of internal combustion engine and preparation method thereof
CN114870860A (en) * 2022-04-14 2022-08-09 中自环保科技股份有限公司 Natural gas vehicle tail gas purification catalyst and preparation method thereof
CN115445613A (en) * 2022-08-11 2022-12-09 凯龙蓝烽新材料科技有限公司 Coating for lean-burn CNG catalyst and preparation method thereof

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