CN109482226A - One-step method prepares transition metal modified molecular sieve integral type catalyst and method - Google Patents
One-step method prepares transition metal modified molecular sieve integral type catalyst and method Download PDFInfo
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- 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
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
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- 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
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- 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
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
- B01J29/7615—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
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates (SAPO compounds)
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/702—Hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
Transition metal modified molecular sieve integral type catalyst and method are prepared the invention discloses one-step method.The preparation method includes coating solution preparation, slurry preparation, catalyst coating, catalyst is dry and calcines four continuous processing processes.The process characteristic is to be not necessarily to be filtered, washed, dry, calcining after coating solution is prepared, and is directly transferred to slurrying and coating process.The technical process is simple, and molecular sieve catalyst obtained has excellent low temperature active, hydrothermal stability, can be used for nitrogen oxides (NOx) selective reduction, hydrocarbon (HC) low-temperature treatment, there is extensive prospects for commercial application.
Description
Technical field
Transition metal modified molecular sieve integral type catalyst and method, the preparation are prepared the present invention relates to one-step method
Molecular sieve catalyst can be applied to diesel engine NOxSelective reduction and HC low-temperature treatment.
Background technique
NOxIt is the important pollutant of diesel engine vent gas with HC.Wherein NOxIt is acid rain, photochemical fog, ozone hole etc.
The main reason for environmental problem, and there is significant impact to human health.HC has the eyes and respiratory tract of human body bright
Aobvious stimulation, and contain the substance for leading to human carcinogen in hydro carbons.At this stage, it can efficiently be reduced using post-processing catalyst
HC and NO in diesel engine vent gasxDischarge, and optimal post-processing catalysis and purification technology at present.
In recent years, diesel engine HC and NO have been greatly reduced using catalyst tail gas clean-up technologyxEqual exhaust emissions.So
And delivery temperature is low when diesel engine starting, is extremely difficult to the initiation temperature of conventional catalyst.Therefore, tail gas row when cold start-up
Put the key reason for often causing diesel emission exceeded.
Currently, NOxPt base or Pt-Pd base oxidation catalysis are mainly used using vanadium based selective reducing catalyst (SCR), HC
Agent (DOC) is handled.The advantage of both catalyst is that have good high temperature catalytic performance, but disadvantage is cryogenic property
It is insufficient.
Studies have shown that being directed to low temperature key technical problem, it is living that modified molecular sieve catalyst materials exhibit goes out excellent low temperature
Property.Mainly there are BEA, MFI, CHA etc. for metal-modified blank molecular sieve.Modified metal includes Mn, Cu, Pd, Pt, Fe etc..
[CN102946997A], which is disclosed, a kind of directly to be exchanged Cu into Na+The preparation method of the molecular sieve powder material of type chabasie.
Na in the technology+The influence of highly significant is played to catalyst activity, is such as controlled during the preparation process not precisely, remaining is super
Cross a certain amount of Na+By the serious durability for reducing catalyst.Based on ion-exchange process the disadvantage, (Chem. such as Ren.L.M
Commun. 2011,47:9783) etc. it is SSZ-13 points modified by the Cu of template fabricated in situ better performances of copper-amine complex
Son sieve catalysis powder body material, but the modified molecular screen material amount containing Cu that this method obtains is high, is unfavorable for ageing properties, needs additional
Carry out drop copper content processing, the higher cost in industrial application, it is more difficult to realize.[CN107262145A] discloses a kind of zeolite carbon
Hydrogen adsorbs the preparation method of reforming catalyst, which carries out Fe ion weight in the FAU type molecular sieve catalytic material independently synthesized
It is whole, and then obtain the hydrocarbon absorption reforming catalyst of Fe-FAU type zeolite.It is more equal in order to allow metal Fe to disperse but in this method
It is even, using the molecular sieve of low silica-alumina ratio, silica alumina ratio 3.7-10.The molecular sieve of the type hydrothermal aging ability resistant to high temperatures
Weaker, being easy high temperature hydrothermal dealumination leads to catalyst inactivation.[CN1205651A] is disclosed using platinum group load
The conventional moleculars such as beta sieve carries out the processing of HC adsorption and oxidation, however, such conventional unmodified molecular sieve is difficult to meet high temperature hydro-thermal
Aging demand.
The technology of preparing of modified molecular screen integral catalyzer is mainly two-step method.First pass through with liquid, washing, drying,
Calcining prepares modified molecular screen coat powder material, then again obtains powder body material progress slurrying, coating, drying, calcining whole
Body formula catalyst.[106984357A] disclose it is a kind of first by after one or more steps ion exchange, through filtering, dry, forge
Modified molecular screen powder body material is fired to obtain, then carries out slurrying again, the method that coating obtains catalyst.[102215960A] is open
The preparation method of zeolite catalyst with CHA crystal structure, low silica and alumina ration, the patent equally use
Two-step method prepares monoblock type molecular sieve catalyst.Two-step process is complicated, and control point is more, is unfavorable for product quality consistency control
System, high production cost, production capacity are low.
The present invention uses an one-step preparation method, obtains the modified molecular screen integral catalyzer haveing excellent performance, and the technique is simple,
Strong operability has the application value compared with high-tech creativeness sum.
Summary of the invention
It is an object of that present invention to provide a kind of one-step method prepare transition metal modified molecular sieve integral type catalyst and
Method.The preparation method includes coating solution preparation, slurry preparation, catalyst coating, catalyst is dry and calcining four continuous
Process flow.The process characteristic is to be not necessarily to be filtered, washed, dry, calcining after coating solution is prepared, and is directly transferred to slurrying and painting
Cover process.Molecular sieve integral type catalyst obtained has excellent low temperature active, hydrothermal stability；
In order to achieve the above object, The technical solution adopted by the invention is as follows:
A kind of step 1: coating solution preparation: by blank molecular sieve powder and certain density transition metal salt solution and auxiliary agent
It is added in reaction kettle, under the conditions of 30 DEG C -150 DEG C, reacts 0.5h ~ 8h；
Blank molecular sieve is Na in the present invention+Type, H+Type, NH4 +One or more of type；Blank molecular sieve includes following one kind
It is or several: BEA, MFI, AEI, AFX, CHA, LTA, SiO2With Al2O3Mass ratio be 8.0-15.0；
Transition metal is one or several kinds of in Cu, Ni, Mn, Co in the present invention；The quality of molecular sieve and transition metal salt solution
Than for 1-50:15-50, transition metal salt solution concentration is 0.005mol/L-5mol/L.It is wherein calculated with metallic element, every kind
Transition metal quality accounts for the 0.05%-5% of molecular sieve quality；
In the present invention auxiliary agent be transition metal, rare earth metal, it is one or several kinds of in alkaline-earth metal, comprising: Cr, Sn, Ce, Ba,
Sr,Fe；Auxiliary agent accounts for the 0.01%-10% of catalyst gross mass；
The pH of coating solution in the present invention be 2-7, using acid or alkali be adjusted, it is selected acid be acetic acid, nitric acid, hydrochloric acid or
In sulfuric acid any one or at least two mixture, selected alkali be ethyl class ammonium hydroxide, Organic Alcohol amine alkali
Any one or at least two mixture；
The temperature of floating coat solution heating of the present invention is 30 DEG C -150 DEG C；
Step 2: slurrying coating: will add a certain amount of binder, auxiliary agent in gained coating solution in step 1, stir evenly,
It is ground to required partial size；Carrier is coated on by the dry coating weight amount of 80g/L-350g/L；After the completion of the catalyst of coating is dry,
0.5h-6h is calcined at 500 DEG C -800 DEG C to get transition metal modified molecular sieve integral type catalyst is arrived；
The present invention uses blank molecular sieve for raw material, passes through coating solution preparation, slurry preparation, catalyst coating, catalyst
Molecular sieve integral type catalyst is made in dry and four one steps of continuous processing process of calcining.The method overcomes conventional two-step
Many and diverse technological problems, molecular sieve catalyst obtained have excellent low temperature active and hydrothermal stability；
Auxiliary agent of the present invention is transition metal, rare earth metal, one or several kinds of in alkaline-earth metal, comprising: Cr, Sn, Ce, Ba, Sr,
Fe；The auxiliary agent accounts for the 0.01%-10% of catalyst gross mass；
The binder that the present invention adds includes Al2O3、SiO2、TiO2、ZrO2It is one or more of in powder or colloid；Addition
Binder is calculated by oxide, and additive amount is the 1%-15% of molecular sieve powder quality；
Slurry size controlling range of the present invention is 1 μm -20 μm；
Coating method of the present invention uses upper feed technique or lower feed technique；Coating number is one or many coatings；
Drying temperature of the present invention is 50 DEG C -200 DEG C, drying time 0.5h-24h；
The temperature that the present invention roasts is 400 DEG C~800 DEG C.
The second object of the present invention is to provide a kind of transition metal modified molecular sieve integral type catalyst, the transition
Metal-modified molecular sieve integral type catalyst is prepared by method as described above.The catalyst has excellent at low temperature
Low temperature active and hydrothermal stability.
The third object of the present invention is to provide a kind of purposes of transition metal modified molecular sieve catalyst, the transition
Metal-modified molecular sieve catalyst can be used for NO in diesel engine vent gasxSelective reduction, HC low-temperature treatment.
Detailed description of the invention
Fig. 1: the NO of two kinds of catalyst of A and B after fresh and agingxThe comparison of selective reduction activity.
Fig. 2: the HC desorption performance comparison of two kinds of catalyst of C and D after fresh and aging.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, of the invention is typical but non-limiting
Embodiment is as follows:
Embodiment 1
The copper-bath for preparing 0.03mol/L, in copper solution and H-SSZ-13 molecular sieve quality than the ratio preparation for 18:1
Coating solution, after being adjusted to 4-5 by pH and stir 6h, addition cerous nitrate (Ce additive amount is calculated by the 0.5% of catalyst weight),
Stirring evenly and adding ethyl class oxyammonia to adjust pH is 5-6.Above-mentioned slurry is ground, size controlling is pressed at 2.5 μm -8 μm
150g/L load capacity is coated on cordierite carrier, and 110 DEG C of drying, coating is dried after reaching load capacity, 650 DEG C of roasting 3h systems
Obtain monoblock type CeOx/ Cu molecular sieve catalyst, number are denoted as A.To what is compared, first prepared using conventional ion exchange method
It is B that Cu-SSZ-13 powder body material carries out coating preparation monoblock type Cu-SSZ-13 catalyst number again.
Embodiment 2
The copper acetate and 0.005mol/L manganese nitrate mixed solution for preparing 0.03mol/L, by copper solution and SAPO-18 molecular sieve matter
Amount prepares coating solution than the ratio for being 18:1, and after being adjusted to 4-5 by pH and stir 6h, (Ce additive amount is by urging for addition cerous nitrate
The 0.2% of agent weight calculates), stirring evenly and adding ethyl class oxyammonia to adjust pH is 5-6.Above-mentioned slurry is ground, grain
Diameter is controlled at 2.5 μm -8 μm, is coated on cordierite carrier by 160g/L load capacity, 110 DEG C of drying, after coating reaches load capacity
Powdered monoblock type CeO is made in drying, 550 DEG C of roasting 3hx/ Mn-Cu-SAPO-18 catalyst.
Embodiment 3
The iron nitrate solution and 0.005mol/L barium hydroxide mixed solution for preparing 0.14mol/L, by mixed solution and molecular sieve
The ratio that mass ratio is 2:1 adds H-type beta molecular sieve, after being adjusted to 4-5 by pH and stir 6h, adds ethyl class oxyammonia
Adjusting pH is 5-6, by the silica of molecular sieve amount addition 5%.Above-mentioned slurry is ground, size controlling is pressed at 1.2 μm -8 μm
240g/L load capacity is coated on cordierite carrier, and 160 DEG C of drying, coating is dried after reaching load capacity, and 650 DEG C of roasting 3h are made
Fe/BaO-beta integral catalyzer.
Embodiment 4
The manganese nitrate solution and 0.005mol/L cerous nitrate mixed solution for preparing 0.08mol/L, by mixed solution and molecular sieve matter
Amount adds NH than the ratio for being 2.86:13Type beta molecular sieve adjusts pH value of solution for 2-3 and after stirring 6h, adds isopropanolamine
Adjusting pH is 6-7, by the zirconium oxide of molecular sieve amount addition 5%.Above-mentioned slurry is ground, size controlling is pressed at 1 μm -10 μm
240g/L load capacity is coated on metallic carrier, and 160 DEG C of drying, coating is dried after reaching load capacity, roasted in 650 DEG C of air
Mn-Ce-beta integral catalyzer is made in 3h, and number is denoted as C.For comparison, first prepared using conventional ion exchange method
H-beta powder body material carries out coating and prepares integral catalyzer number to be D again.
Embodiment 5
0.2mol/L copper acetate solution is configured, in mixed solution and molecular sieve quality than adding LTA molecule for the ratio of 1.43:1
Sieve adjusts pH value of solution for 5-6 and after stirring 3h, by the aluminium oxide of molecular sieve amount addition 3%.Above-mentioned slurry is ground, size controlling
At 1 μm -10 μm；Slurry is coated on wall-flow type SiC carrier by load capacity 100g/L, and 160 DEG C of drying, 700 DEG C of roasting 1h are made
Cu-LTA integral catalyzer.
Embodiment 6
The solution and 0.005mol/L nitric acid iron mixed solution for preparing 0.15mol/L cerous nitrate, by mixed solution and molecular sieve matter
Amount adds AFX molecular sieve than the ratio for being 3.33:1, after being 2-3 and stirred 12h with nitric acid adjusting pH value of solution, adds ethyl hydrogen-like
It is 6-7 that amine oxide, which adjusts pH, by the aluminium oxide of molecular sieve amount addition 5%.Above-mentioned slurry is ground, size controlling at 1 μm -10 μm,
It is coated on cordierite carrier by 200g/L load capacity, the catalysis of Ce-Fe-AFX monoblock type is made in 140 DEG C of drying, 550 DEG C of roasting 6h
Agent.
It is as follows that embodiment 1 tests catalyst sample condition:
Catalyst specification is φ 25.4mm × 76.2mm, coating load amount 150g/L, the composition of reaction mixture gas are as follows: [NO]=
[NH3]=500ppm, [O2]=10%, [H2O]=10%, N2Balance Air, air speed 100,000h-1, 180 DEG C~550 DEG C of reaction temperature.
NO、NO2、NH3And N2O gas is measured using infrared-gas pond.
The sample of prepared integral catalyzer is carried out to active investigation, fresh and aging on fixed bed reactors
The catalytic activity of two kinds of catalyst of A and B compares as shown in Fig. 1 afterwards.
Compared to catalyst B obtained by conventional ion exchange process, preparation method institute provided by the invention it can be seen from Fig. 1
Obtain catalyst A has higher NO under the conditions of low temperature (250 DEG C of <)xCatalytic activity and broader active temperature windows.With
This simultaneously, catalyst A still keeps fine NO after hydrothermal aging 16 hours at 800 DEG CxReduction activation.It can thus be seen that this hair
Catalyst made from the preparation method of bright offer has excellent low temperature active, hydro-thermal in the lower temperature range investigated
Stability and broader active temperature windows.
It is as follows that embodiment 4 tests monolithic catalyst sample condition:
Catalyst specification is φ 25.4mm × 76.2mm, catalyst coat load capacity 240g/L, the composition of reaction mixture gas are as follows:
[C3H8]=100ppm, [C3H6]=100ppm, [C2H8]=100ppm, [C2H6]=100ppm, [CO]=200ppm, [H2O]=5%,
[O2]=8%, [NO]=500ppm, N2Make Balance Air, air speed 60,000h-1, before reaction, catalyst temperature stabilization, will at 50 DEG C
All atmosphere are passed through catalyst, when catalyst outlet concentration is consistent with setting value, using N2The HC class of physical absorption is purged, so
Temperature programming afterwards, 450 DEG C of progress programmed desorptions.
Prepared integral catalyzer is carried out to active investigation on fixed bed reactors, two kinds of catalyst of C and D
Total HC desorption situation is as shown in Fig. 2 after fresh and aging.As seen from Figure 2, compared to the obtained catalysis of conventional ion exchange process
Agent D, catalyst C obtained by preparation method provided by the invention have a higher HC desorption rate under cryogenic, and desorption temperature to
Low temperature offset.For two kinds of catalyst after 650 DEG C of hydrothermal agings handle 50h, total HC desorption rate of catalyst C is almost unchanged, and
Catalyst D desorption rate is greatly decreased.This explanation still keeps fine HC to inhale after preparing the processing of catalyst hydrothermal aging using the present invention
Attached ability.
The Applicant declares that the present invention illustrates method detailed of the invention through the foregoing embodiment, but the present invention not office
It is limited to above-mentioned specific method, this means that the present invention, which necessarily relies on above-mentioned specific method, to be implemented.Technical field
Technical staff carries out equivalence replacement to each raw material of product of the present invention and addition assists it will be clearly understood that any improvement in the present invention
Ingredient etc., all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. a kind of preparation method of transition metal modified molecular sieve integral type catalyst, it is characterised in that prepared using one-step method
Technology, comprising the following steps:
1) prepared by coating solution: a kind of blank molecular sieve powder is added to certain density transition metal salt solution and auxiliary agent
In reaction kettle, 0.5h-8h is reacted under the conditions of 30 DEG C -150 DEG C, the mass ratio of the blank molecular sieve and transition metal salt solution is
1-50:15-50；
2) prepared by slurry: 1) will add a certain amount of binder, auxiliary agent in the coating solution described in, stir evenly, be ground to institute
Need partial size；
3) catalyst coats: 2) slurry described in being coated on monolithic substrate, dry coating weight 80g/L-350g/L；
4) catalyst is dry, calcines: 3) catalyst described in being dried, is calcined to get molecular sieve integral type of the invention
Catalyst.
2. the method as described in claim 1, it is characterised in that: step 1) the floating coat solution is disposable preparation, nothing
It need to repeatedly process.
3. the method as described in claim 1, it is characterised in that: coating solution described in step 1) is not necessarily to filtering, washes after preparing
Wash, dry, calcine, be directly transferred to it is described 2), 3), 4) process.
4. the method as described in claim 1, it is characterised in that: step 2) the slurry size controlling range is 1 μm -20 μm.
5. the method as described in claim 1, which is characterized in that the step 3) coating method using upper feed technique or under
Feed technique.
6. the method as described in claim 1, which is characterized in that it is one or many coatings that step 3), which coats number,.
7. the method as described in claim 1, which is characterized in that the step 4) drying temperature is 50 DEG C -200 DEG C, when dry
Between 0.5h-24h；
The coating solution pH is 2-7, preferably 4-6；
The heating temperature is 30 DEG C -150 DEG C, preferably 60 DEG C~80 DEG C；
The temperature of the step 4) roasting is 400 DEG C~800 DEG C, preferably 500 DEG C -650 DEG C.
8. a kind of preparation method of transition metal modified molecular sieve integral type catalyst, it is characterised in that the following steps are included:
The copper-bath for preparing 0.03mol/L, in copper solution and H-SSZ-13 molecular sieve quality than the ratio preparation for 18:1
Coating solution after being adjusted to 4-5 by pH and stir 6h, adds cerous nitrate, and Ce additive amount is calculated by the 0.5% of catalyst weight,
Stirring evenly and adding ethyl class oxyammonia to adjust pH is 5-6, above-mentioned slurry is ground, size controlling is pressed at 2.5 μm -8 μm
150g/L load capacity is coated on cordierite carrier, and 110 DEG C of drying, coating is dried after reaching load capacity, and 650 DEG C of roasting 3h are made
Monoblock type CeOx/ Cu molecular sieve catalyst.
9. a kind of transition metal modified molecular sieve integral type catalyst, it is characterised in that:
The catalytic component includes: transition metal, blank molecular sieve, binder, auxiliary agent, monolithic substrate,
Monolithic substrate in the catalyst includes wall-flow type or through type carrier, and carrier medium includes cordierite, silicon carbide, titanium
Sour aluminium, iron-chromium-aluminum metal；
The blank molecular sieve includes following a kind of or several: BEA, MFI, AEI, AFX, CHA, LTA, SiO2With Al2O3
Mass ratio is 8.0-15.0；The blank molecular sieve is Na+Type, H+Type, NH4 +One or more of type；
The transition metal is one or more of Cu, Ni, Mn, Co；
The added transition metal salt solution concentration is 0.005mol/L-5mol/L；
It is calculated with metallic element, every kind of transition metal quality accounts for the 0.05%-5% of molecular sieve quality, preferably 1.5%-2.5%；
The auxiliary agent is the one or more of transition metal, rare earth metal, alkaline-earth metal, including Cr, Sn, Ce, Ba, Sr, Fe, is helped
Agent accounts for the 0.01%-10% of catalyst gross mass；
The binder of the addition is Al2O3、SiO2、TiO2、ZrO2It is one or more of in powder or colloid；
The binder of the addition is calculated by oxide, and additive amount is the 1%-15% of molecular sieve powder quality.
10. the molecular sieve catalyst of claim 1 the method preparation is used for NOxSelective reduction or HC low-temperature treatment.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102338A (en) * | 2019-04-30 | 2019-08-09 | 昆明贵研催化剂有限责任公司 | A kind of ammoxidation catalyst and preparation method thereof of high nitrogen selective |
| CN110404580A (en) * | 2019-08-08 | 2019-11-05 | 无锡威孚环保催化剂有限公司 | Rare-earth metal modified molecular sieve catalyst and preparation method thereof |
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| CN111762795A (en) * | 2020-07-13 | 2020-10-13 | 包头稀土研究院 | Molecular sieve containing rare earth elements and production method thereof |
| CN111871456A (en) * | 2020-08-20 | 2020-11-03 | 江苏博霖环保科技有限公司 | Preparation method for synthesizing copper-containing SCR catalyst with CHA structure by one-step method |
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| CN110947414A (en) * | 2019-12-12 | 2020-04-03 | 中节能万润股份有限公司 | Copper-iron bimetallic load monolithic denitration catalyst, and preparation method and application thereof |
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| CN112717991A (en) * | 2020-12-29 | 2021-04-30 | 青岛华世洁环保科技有限公司 | Preparation method and application of Fe and Cu composite molecular sieve catalyst |
| CN117323969A (en) * | 2023-11-30 | 2024-01-02 | 中汽研汽车检验中心（天津）有限公司 | Efficient nitrogen oxide adsorbent, preparation method and application |
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