CN104190413B - SCR-based NO oxidation catalyst and preparation method thereof - Google Patents
SCR-based NO oxidation catalyst and preparation method thereof Download PDFInfo
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- CN104190413B CN104190413B CN201410396395.1A CN201410396395A CN104190413B CN 104190413 B CN104190413 B CN 104190413B CN 201410396395 A CN201410396395 A CN 201410396395A CN 104190413 B CN104190413 B CN 104190413B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 79
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 21
- 230000003647 oxidation Effects 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 86
- 239000011248 coating agent Substances 0.000 claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 14
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- DUFCMRCMPHIFTR-UHFFFAOYSA-N 5-(dimethylsulfamoyl)-2-methylfuran-3-carboxylic acid Chemical compound CN(C)S(=O)(=O)C1=CC(C(O)=O)=C(C)O1 DUFCMRCMPHIFTR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000002808 molecular sieve Substances 0.000 claims abstract description 8
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000006255 coating slurry Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000002270 dispersing agent Substances 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 21
- 238000000498 ball milling Methods 0.000 claims description 13
- 238000007598 dipping method Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 claims description 2
- 238000001802 infusion Methods 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 abstract description 8
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 229910052763 palladium Inorganic materials 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 238000005470 impregnation Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- 241000264877 Hippospongia communis Species 0.000 description 8
- 230000032683 aging Effects 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 241000256844 Apis mellifera Species 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 3
- 239000008246 gaseous mixture Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
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- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a SCR-based NO oxidation catalyst and a preparation method thereof. The preparation method of the SCR-based NO oxidation catalyst comprises the following steps: firstly coating the surface of a catalyst carrier with coating slurry containing noble metal Pt by taking cordierite honeycomb ceramic as the catalyst carrier, drying and roasting; and subsequently fixing a certain amount of noble metal Pd solution at one end of the catalyst by using an impregnation method, wherein the amount of the impregnated noble metal Pd solution accounts for 1/3 of the total water absorption amount of the catalyst; the coating slurry is prepared by taking a molecular sieve as an HC adsorption material, taking SiO2 as a dispersing agent, taking zirconium acetate as a thermal stability additive, taking noble metal Pt as an active component and adding an alumina gel adhesive. The preparation method of the SCR-based NO oxidation catalyst is simple in processing steps; the noble metal Pt or Pd is impregnated in the air inlet direction of the prepared catalyst; by virtue of the improved catalyst, the oxidation rate of the NO at the low temperature can be improved, so that the and the temperature window is relatively wide when the NO is oxidized to between 40%-70% in the process of oxidizing NO into NO2; the catalyst is relatively high in stability.
Description
Technical field
The present invention relates to a kind of no oxidation catalyst based on scr and preparation method thereof, belong to diesel vehicle oxidizing catalytic
The preparing technical field of agent.
Background technology
Automobile exhaust pollution has become one of main source of atmospheric pollution.Most no in cityx, co, hc and pm
All produced by vehicle exhaust.nox, co, hc, pm not only cause to human body to damage but also produce blue under certain conditions
Photochemical fog, make vegetation dead, the environment of human survival is destroyed.Existing exhaust method regulation, Beijing, Shanghai will be implemented
Diesel vehicle state five discharge standard, national implementation date of diesel vehicle state four discharge standard nearly, therefore, urges to diesel vehicle oxidisability
The catalytic conversion efficiency of agent it is also proposed higher requirement.
Diesel vehicle oxidative catalyst (doc) is used for solvable organic in co, no, hc and pm in the tail gas of oxidated diesel oil car
Composition (sof), its coating is mainly made up of oxide coating and active noble metal constituent, and noble metal is the pass of oxidative catalyst
Key component, it is simply that can reduce the chemical anti-of hc, co and sof in diesel engine vent gas etc. using doc for diesel vehicle doc
The activation energy answered, enables these materials to carry out oxidation reaction at a lower temperature with the oxygen in tail gas, is converted into co2With
h2o；Oxidation catalyst, generally with ceramic honey comb or honeycomb as carrier, loads oxide coating and active metal group thereon
Point, conventional noble metal component is pt, pd etc., and the widely used noble metal of current exhaust gas from diesel vehicle post processing is pt, the master of pt
If being used for aoxidizing co, hc.
Gradually strict with discharge standard, simply use doc and be unable to reach emission request, doc and dpf is used in conjunction elimination pm
Or it is used in conjunction elimination nox with scr and be increasingly becoming study hotspot.It is desirable to no generates no when doc and dpf is used in conjunction2Conversion ratio
Height, is so conducive to the regeneration of dpf；It is desirable to no generates no when doc and scr is used in conjunction2Conversion ratio between 40%～70%,
And window temperature is more wide better, be so conducive to accelerating the reaction rate of scr, reduce nox discharge.
There are problems in existing diesel vehicle oxidative catalyst at present in terms of no oxidation, the diesel oil based on scr aspect
The no oxidizing temperature window of car oxidative catalyst is narrower, and when noble metal addition improves, no conversion ratio is higher；Through aging
Afterwards, catalyst performance declines substantially.
Content of the invention
The invention aims in solution prior art diesel vehicle oxidative catalyst no is aoxidized 40%～
A kind of narrower problem of temperature window between 70%, there is provided no based on scr that preparation method is simple, no conversion ratio is wider
Oxidation catalyst and preparation method thereof.
The present invention adopts the following technical scheme that a kind of no oxidation catalyst based on scr, and catalyst is made pottery with cordierite honeycomb
Porcelain is catalyst carrier, and the surface-coated of catalyst carrier contains the coating slurry of noble metal pt, and one end of catalyst is using dipping
Method is fixed with a certain amount of noble metal pd solution, and the noble metal pd amount of solution of described fixation is the 1/ of described catalyst total suction
3, it is hc adsorbing material that described coating slurry adopts molecular sieve, sio2For dispersant, zirconium acetate is thermally-stabilised auxiliary agent, noble metal pt
For active component, aluminium glue binding agent is added to make.
A kind of preparation method of the no oxidation catalyst based on scr, comprises the steps:
(1) River Bank Stability: by a certain percentage by sio2, molecular sieve, zirconium acetate, aluminium glue binding agent be added to deionized water
In, weight ratio for 0.4～0.72:0.25～0.45:0.02～0.1:0.01～0.05, stirs, and adds nitric acid to adjust
Section serosity ph is less than 4.0；
(2) serosity ball milling: serosity grinds through planetary ball mill, the rotating speed of planetary ball mill is 250～380 turns/
Point, run time is 3～6h, and serous granule degree to d90 is 2～20um；
(3) mensure of solid content: take 10g serosity in dry pot, dry pot is placed in 550～600 DEG C of Muffle kiln roasting 10-
20min, is cooled to room temperature, weighs its powder quality, with this quality divided by 10g, just obtains slurry solid content；
(4) addition of noble metal pt solution: noble metal pt solution is added in ball milling rear slurry, stirs 2～8h, extremely live
Property component noble metal pt solution be thoroughly dispersed in serosity, the amount of added noble metal pt is 15～30g/ft3；
(5) coating coating: carrier cordierite honeycomb ceramic is immersed in serosity, takes out the carrier cordierite honeybee being saturated with serosity
Nest pottery, blows away unnecessary serosity with air gun, and by coated weight be 100～180g/l and solid content controls wet weightening, calculates actual painting
The amount of covering；
(6) dry: through 100～180 DEG C of flash bakings, drying time is 3～6h by coating to the catalyst having coated
Water evaporation fall；
(7) roasting: put in Muffle furnace by drying rear catalyst, 450～550 DEG C of roasting 1～2h, insulation cools down after terminating
To room temperature, weigh catalyst weight；
(8) quantitative dipping noble metal pd solution: one end dipping noble metal pd solution of catalyst, the amount of dipping noble metal pd
For 5～10g/ft3, as airintake direction, catalyst dries 3～6h through 100～180 DEG C to dipping noble metal area end, in 450
Under the conditions of～550 DEG C, roasting 1～2h makes.
Further, take the serosity 20g with noble metal to be centrifuged after the completion of described step (4), carry out solid liquid phase and divide
From taking solid fraction icp to carry out the mensure of noble metal pt content.
Further, the mass ratio of the noble metal platinum in described step (4) and (9) and palladium is 3:1.
Present invention process step is simple, and the catalyst prepared is impregnated with noble metal pd in the direction of air inlet, after improvement
Catalyst can improve no oxygenation efficiency at low temperature, makes no be oxidized to no2Between 40%～70%, temperature window is more wider,
The stability of catalyst is more preferable.
Specific embodiment
Below will the invention will be further described according to specific embodiment.Three below example is all using a diameter of
The cylindrical cordierite honeycomb ceramic carrier of 80mm, a height of 60mm, volume is 0.301l, and vehicle weight is 97g, noble metal pt's
Concentration is 0.138g (noble metal)/g (liquid), and the concentration of noble metal pd is 0.1511g (noble metal)/g (liquid).
Embodiment one: a kind of preparation method of the no oxidation catalyst based on scr, comprise the steps:
(1) River Bank Stability: by a certain percentage by sio2, molecular sieve, zirconium acetate, binding agent be added in deionized water, weight
Amount ratio is 0.72:0.25:0.02:0.01, stirs, and surveying ph is 3.24；
(2) serosity ball milling: serosity grinds through planetary ball mill, rotating speed is 250 revs/min, and run time is 6h, serosity
Granularity is 3.22um to d90；
(3) mensure of solid content: take 10g serosity in dry pot, dry pot is placed in 600 DEG C of Muffle kiln roasting 10min, cold
But to room temperature, weighing its powder quality is 3.95g, and with this quality divided by 10g, just obtaining slurry solid content is 39.5%；
(4) addition of noble metal pt solution: take the serosity 1000g after ball milling, noble metal pt addition is 15g/ft3, apply
The amount of covering is 100g/l, and the amount calculating noble metal pt is 2.092g, and the amount weighing noble metal pt solution is 15.157g, will
Noble metal pt solution be added to ball milling after serosity in, stir 2h, be thoroughly dispersed in serosity to active component noble metal platinum；
(5) take 20g serosity to be placed in test tube, put into centrifugation in centrifuge, carry out Solid-Liquid Separation, measured using icp solid
The content of noble metal pt in phase, result is 0.0052g (noble metal)/g (powder body)；
(6) coating coating: carrier cordierite honeycomb ceramic is immersed in serosity, takes out the carrier cordierite honeybee being saturated with serosity
Nest pottery, blows away unnecessary serosity with air gun, by coated weight requirement and the wet weightening of solid content control targe recording of 150g/l, counts
Calculation catalyst practical coating amount is 77.4g；
(7) dry: the catalyst having coated dries 6h through 100 DEG C, and the water evaporation in coating is fallen；
(8) roasting: put in Muffle furnace by drying rear catalyst, 450 DEG C of roasting 2h, insulation is cooled to room temperature after terminating,
Weighing catalyst weight is 127.5g；
(9) noble metal pd solution quantitatively impregnates: catalyst impregnates fixing noble metal pd solution at one end, and noble metal pd adds
Measure as 5g/ft3, the amount calculating noble metal pd is 0.053g, weighs noble metal pd solution 0.3509g, adds water to dipping
Amount desired value is 42.5g, and as airintake direction, catalyst dries 6h through 100 DEG C to dipping pd noble metal area end, in 450 DEG C
Under the conditions of roasting 2h be prepared from；
Embodiment two: a kind of preparation method of the no oxidation catalyst based on scr, comprise the steps:
(1) River Bank Stability: by a certain percentage by sio2, molecular sieve, zirconium acetate, aluminium glue binding agent be added to deionized water
In, its weight ratio for 0.58:0.35:0.04:0.03, stirs, and surveying ph is 3.29；
(2) serosity ball milling: serosity grinds through planetary ball mill, rotating speed is 320 revs/min, and run time is 4h, serosity
Granularity is 3.16um to d90；
(3) mensure of solid content: take 10g serosity in dry pot, dry pot is placed in 600 DEG C of Muffle kiln roasting 10min, cold
But to room temperature, weighing its powder quality is 3.89g, with this quality divided by 10g, just obtains slurry solid content 38.9%；
(4) addition of precious metal solution pt: take ball milling rear slurry 1000g, noble metal pt addition is 20g/ft3, coating
Measure as 140g/l, the amount calculating noble metal pt is 1.9625g, the amount weighing noble metal pt solution is 14.24g, your gold
Belong in the serosity after pt solution is added to ball milling, stir 2h, be thoroughly dispersed in serosity to active component noble metal pt；
(5) take 20g serosity to be placed in test tube, put into centrifugation in centrifuge, carry out Solid-Liquid Separation, measured using icp solid
The content of noble metal pt in phase, result is 0.0050g (noble metal)/g (powder body)；
(6) coating coating: carrier cordierite honeycomb ceramic is immersed in serosity, takes out the carrier cordierite honeybee being saturated with serosity
Nest pottery, blows away unnecessary serosity with air gun, by coated weight requirement and the wet weightening of solid content control targe recording of 140g/l
108.3g, practical coating amount is 110.3g；
(7) dry: the catalyst having coated dries 4h through 150 DEG C, and the water evaporation in coating is fallen；
(8) roasting: put in Muffle furnace by drying rear catalyst, 500 DEG C of roasting 1.5h, insulation is cooled to room after terminating
Temperature, weighing catalyst weight is 139.1g；
(9) noble metal pd solution quantitatively impregnates: catalyst impregnates noble metal pd solution at one end, and noble metal pd addition is
6.7g/ft3, the amount calculating noble metal pd is 0.071g, weighs noble metal pd solution 0.4698g, adds water to pickup
Desired value is 46.3g, and the pickup of this noble metal pd solution is the 1/3 of the total water absorption rate of catalyst, impregnates noble metal pd solution area
Domain end dries 4h as airintake direction, catalyst through 150 DEG C, and under the conditions of 500 DEG C, roasting 1.5h is prepared from；
Embodiment three: a kind of preparation method of the no oxidation catalyst based on scr, comprise the steps:
(1) River Bank Stability: by a certain percentage by sio2, molecular sieve, zirconium acetate, aluminium glue binding agent be added to deionized water
In, its weight ratio for 0.4:0.45:0.1:0.05, stirs, and surveying ph is 3.45；
(2) serosity ball milling: serosity grinds through planetary ball mill, rotating speed is 380 revs/min, and run time is 3h, serosity
Granularity is 3.08um to d90；
(3) mensure of solid content: take 10g serosity in dry pot, dry pot is placed in 580 DEG C of Muffle kiln roasting 20min, cold
But to room temperature, weighing its powder quality is 3.97g, with this quality divided by 10g, just obtains slurry solid content 39.7%；
(4) addition of noble metal pt solution: take ball milling rear slurry 1000g, noble metal pt addition is 30g/ft3Calculate,
Coated weight is 180g/l, and the amount calculating noble metal pt is 2.337g, and the amount weighing noble metal pt solution is 16.937g,
Noble metal pt solution be added to ball milling after serosity in, stir 8h, be thoroughly dispersed in serosity to active component noble metal pt；
(5) take 20g serosity to be placed in test tube, put into centrifugation in centrifuge, carry out Solid-Liquid Separation, measured using icp solid
The content of noble metal pt in phase, result is 0.0057g (noble metal)/g (powder body)；
(6) coating coating: carrier cordierite honeycomb ceramic is immersed in serosity, takes out the carrier cordierite honeybee being saturated with serosity
Nest pottery, blows away unnecessary serosity with air gun, by the coated weight requirement and wet weightening of solid content control targe recording of 180g/l is
136.5g, practical coating 137.8g；
(7) dry: the catalyst having coated dries 3h through 180 DEG C, and the water evaporation in coating is fallen；
(8) roasting: put into 550 DEG C of roasting 1h in Muffle furnace by drying rear catalyst, insulation is cooled to room temperature after terminating, and claims
Amount catalyst weight is 151.7g；
(9) noble metal pd solution quantitatively impregnates: catalyst impregnates noble metal pd solution at one end, and noble metal pd addition is
10g/ft3, the amount calculating noble metal pd is 0.106g, weighs noble metal pd solution 0.703g, adds water to pickup mesh
Scale value is 50.5g, and as airintake direction, catalyst dries 3h through 180 DEG C to the area end of dipping noble metal pd solution, in 550
Under the conditions of DEG C, roasting 1h is prepared from.
Activity rating is carried out to the catalyst of embodiment two preparation.
First, fresh state catalyst activity evaluation is investigated:
Test is carried out in high temperature furnace.
Method of testing: will be containing no, co2、h2o、c3h8, the gaseous mixture of co 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 shown in Table 1
The fresh state catalyst activity evaluation result of table 1
Found by table 1 Data Comparison, no is converted into no2It is 170 DEG C -425 DEG C in the temperature window of 40%-70%.
2nd, heat ageing rear catalyst activity rating is investigated:
Pre-treatment: first catalyst is placed in aging in Muffle furnace, aging temperature is 750 DEG C, ageing time is 20h, so
Again the conversion ratio of nox, co and hc in vehicle exhaust respectively is investigated afterwards,
Test is to carry out in high temperature reaction stove.
Method of testing: will be containing no, co2、h2o、c3h8, the gaseous mixture of co 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 shown in Table 2.
Table 2 heat ageing rear catalyst Activity evaluation
From the data in table 2, it can be seen that no is converted into no2Temperature window 40%～70% is 202 DEG C～407 DEG C, low temperature window
Mouth comparatively fresh state improves nearly 32 DEG C, is 202 DEG C, can reach more than 40% at 200 DEG C about, reach requirement, high temperature window exists
400 DEG C remain in that more than 40%.
3rd, sulfur aging rear catalyst activity rating is investigated:
Pre-treatment: the catalyst of preparation is placed in Muffle furnace, is passed through so2, 100ppm, 350 DEG C of heating-up temperature, the time
10h, then more respectively to the no in vehicle exhaustx, the conversion ratio of co and hc investigated.
Test is to carry out in high temperature reaction stove.
Method of testing: will be containing no, co2、h2o、c3h8, the gaseous mixture of co 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 shown in Table 3.
Table 3 sulfur aging catalyst Activity evaluation
As seen from the results in Table 3, no is converted into no2It is 206～396 DEG C in the temperature window of 40%-70%, low temperature window is relatively
Fresh state improves nearly 36 DEG C, is 206 DEG C, and high temperature window reaches more than 40% in 396 DEG C of no oxidations.
Claims (4)
1. a kind of no oxidation catalyst based on scr it is characterised in that: catalyst with cordierite honeycomb ceramic for catalyst carry
Body, the surface-coated of catalyst carrier contains the coating slurry of noble metal pt, and one end of catalyst is fixed with necessarily using infusion process
The noble metal pd solution of amount, the noble metal pd amount of solution of described fixation is the 1/3 of described catalyst total suction, described coating slurry
It is hc adsorbing material that liquid adopts molecular sieve, sio2For dispersant, zirconium acetate is thermally-stabilised auxiliary agent, and noble metal pt is active component,
Aluminium glue binding agent is added to make.
2. the no oxidation catalyst based on scr described in claim 1 preparation method it is characterised in that: comprise the steps:
(1) River Bank Stability: in proportion by sio2, molecular sieve, zirconium acetate, aluminium glue binding agent be added in deionized water, weight ratio is
0.4 ~ 0.72:0.25 ~ 0.45:0.02 ~ 0.1:0.01 ~ 0.05, stirs, and adds nitric acid to adjust serosity ph and is less than 4.0；
(2) serosity ball milling: serosity grinds through planetary ball mill, the rotating 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) mensure of solid content: take 10g serosity in dry pot, dry pot is placed in 550 ~ 600 DEG C of Muffle kiln roasting 10-
20min, is cooled to room temperature, weighs its powder quality, with this quality divided by 10g, just obtains slurry solid content；
(4) addition of noble metal pt solution: noble metal pt solution is added in ball milling rear slurry, stirs 2 ~ 8h, to activearm
Noble metal pt solution is divided to be thoroughly dispersed in serosity, the amount of added noble metal pt is 15 ~ 30g/ft3；
(5) coating coating: carrier cordierite honeycomb ceramic is immersed in serosity, takes out the carrier cordierite honeycomb pottery being saturated with serosity
Porcelain, blows away unnecessary serosity with air gun, and by coated weight be 100 ~ 180g/l and solid content controls wet weightening, calculates practical coating amount；
(6) dry: through 100 ~ 180 DEG C of flash bakings, drying time is that the water in coating is steamed by 3 ~ 6h to the catalyst having coated
Send out；
(7) roasting: put in Muffle furnace by drying rear catalyst, 450 ~ 550 DEG C of roasting 1 ~ 2h, insulation is cooled to room after terminating
Temperature, weighs catalyst weight；
(8) quantitative dipping noble metal pd solution: one end dipping noble metal pd solution of catalyst, the amount of dipping noble metal pd is 5 ~
10g/ft3, as airintake direction, catalyst dries 3 ~ 6h through 100 ~ 180 DEG C to dipping noble metal pd area end, in 450 ~ 550
Under the conditions of DEG C, roasting 1 ~ 2h makes.
3. as claimed in claim 2 the no oxidation catalyst based on scr preparation method it is characterised in that: described step (4) is complete
Take the serosity 20g with noble metal pt to be centrifuged after one-tenth, carry out Solid-Liquid Separation, take solid fraction icp to carry out noble metal
The mensure of pt content.
4. as claimed in claim 2 the no oxidation catalyst based on scr preparation method it is characterised in that: described step (4) and
(8) mass ratio of noble metal pt and pd in is 3:1.
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| CN105148981B (en) * | 2015-09-29 | 2017-10-17 | 无锡威孚力达催化净化器有限责任公司 | Diesel vehicle multicoat oxidative catalyst and preparation method thereof |
| CN107998855B (en) * | 2016-11-01 | 2021-03-16 | 中国石油化工股份有限公司 | Two-stage flue gas denitration process and denitration equipment |
| CN107999058A (en) * | 2016-11-01 | 2018-05-08 | 中国石油化工股份有限公司 | A kind of two-phase method flue-gas denitration process and denitration device |
| CN108686453A (en) * | 2017-04-12 | 2018-10-23 | 宁夏澍侍信息科技有限公司 | A kind of aluminum-bar heating furnace exhaust gas processing device |
| CN108404975B (en) * | 2018-04-27 | 2021-03-23 | 中自环保科技股份有限公司 | Oxidation type catalytic system with good low-temperature ignition performance and preparation process thereof |
| CN108579801B (en) * | 2018-04-27 | 2021-03-23 | 中自环保科技股份有限公司 | Oxidation type catalytic system with good low-temperature NO oxidation capacity and preparation method thereof |
| CN108816224A (en) * | 2018-06-26 | 2018-11-16 | 中国天辰工程有限公司 | A kind of catalyst and preparation method handling the exhaust gas in the roasting of sial phosphorus molecular sieve |
| CN109395757A (en) * | 2018-11-12 | 2019-03-01 | 无锡威孚环保催化剂有限公司 | A kind of catalyst and preparation method thereof reducing dpf regeneration temperature |
| CN111408402A (en) * | 2020-04-10 | 2020-07-14 | 福建龙净环保股份有限公司 | Titanium modified SSZ-13 type molecular sieve catalyst slurry, preparation method thereof, modified molecular sieve catalyst and catalytic ceramic filter tube |
| CN111514922B (en) * | 2020-05-09 | 2022-12-13 | 无锡威孚环保催化剂有限公司 | DPF catalyst with better dispersity and preparation method thereof |
| CN115301296B (en) * | 2021-05-07 | 2024-04-05 | 国家能源投资集团有限责任公司 | Denitration catalyst and its preparation method and application |
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| CN115555044B (en) * | 2022-10-10 | 2024-02-09 | 无锡威孚环保催化剂有限公司 | Application of catalyst in removing NOx pollutants of hydrogen internal combustion engine |
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