CN106378179A - A combined molecular sieve SCR catalyst having a wide temperature window - Google Patents
A combined molecular sieve SCR catalyst having a wide temperature window Download PDFInfo
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- CN106378179A CN106378179A CN201610692516.6A CN201610692516A CN106378179A CN 106378179 A CN106378179 A CN 106378179A CN 201610692516 A CN201610692516 A CN 201610692516A CN 106378179 A CN106378179 A CN 106378179A
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/005—Mixtures of molecular sieves comprising at least one molecular sieve which is not an aluminosilicate zeolite, e.g. from groups B01J29/03 - B01J29/049 or B01J29/82 - B01J29/89
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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
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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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
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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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
- B01J29/80—Mixtures of different zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
- B01D2255/502—Beta zeolites
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
- B01D2255/504—ZSM 5 zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2255/00—Catalysts
- B01D2255/65—Catalysts not containing noble metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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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
- B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
- B01J29/10—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing iron group metals, noble metals or copper
- B01J29/14—Iron group metals or copper
- B01J29/146—Y-type faujasite
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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
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/42—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing iron group metals, noble metals or copper
- B01J29/46—Iron group metals or copper
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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
- B01J29/72—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
- B01J29/7215—Zeolite Beta
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates (SAPO compounds)
Abstract
A combined molecular sieve SCR catalyst having a wide temperature window is disclosed, and includes a substrate and two active coatings disposed on the substrate, wherein the upstream active coating contains a first catalyst, the downstream active coating contains a second catalyst, the upstream and downstream active coatings do not overlap with each other, the upstream active coating contains a copper-based molecular sieve catalyst, and the downstream active coating contains an iron-based molecular sieve catalyst. The combined molecular sieve SCR catalyst gives consideration to the optimum low temperature performance of the copper-based molecular sieve catalyst and the optimum high temperature performance of the iron-based molecular sieve catalyst.
Description
Technical field
The present invention relates to a kind of catalyst of vehicle maintenance service technical field and its technology of preparing, specifically a kind of
The composite molecular sieve SCR catalyst of wide temperature window.
Background technology
In recent years, China has formulated increasingly stricter rule and standard to control the discharge of vehicle exhaust, extensive
Gasoline car major pollutants discharged NOx, CO, HC can not cut down more than 90% by the three-way catalyst of application, but with gasoline engine not
With diesel engine is burning under excess oxygen, and high air-fuel ratio limits the use of three-way catalyst, therefore, for diesel oil
The heterogeneity of Pollution from the engine exhaust and control targe and occur in that different post-processing technology means.
Carrying out overall reduction exhaust pollution of diesel engines thing with DOC+DPF+SCR combination technique becomes trend, especially for weight
The emission control of type diesel vehicle.DOC mainly for the treatment of the dissolved organic matter (SOF) in HC, the CO and particulate matter in aerofluxuss,
To NOXEffect little.DPF is used for removing the particulate matter in aerofluxuss, can affect NO/NO in nitrogen oxides after there is cyclic regeneration2
Ratio.SCR (SCR) is the removal of nitrogen oxide technology commonly using most at present, and the key of this technology is choosing
Select the catalyst of function admirable.
At present, commercial Application most commonly used SCR catalyst system mostly is catalytic component based on vanadium, mainly includes V2O5/TiO2、
V2O5/MO3‐TiO2And V2O5/WO3‐TiO2Deng, such catalyst technology is ripe, has the advantages that high activity and high selectivity, but
There is also V species secondary pollution and effective operation window narrower (300～400 DEG C) the problems such as, thus, new environmental friendliness
Efficient molecular sieve SCR catalyst become the focus of research.
Research finds, cuprio molecular sieve catalyst low temperature performance well, and the high temp effect of iron-based molecular sieve catalyst is good, Cu Fe
Molecular sieve catalyst has high temperature performance concurrently.But existing copper ferrum-based catalyst is all by the load of copper and iron active component or ion
Exchange to same molecular sieve, the presence of two kinds of active components can produce certain restriction to the performance of respective one-component, though
So there is certain low temperature and high-temperature behavior, but be not reaching to Performance optimization.
Content of the invention
The present invention is directed to deficiencies of the prior art, and the composite molecular sieve SCR proposing a kind of wide temperature window urges
Agent, by the first molecular sieve catalyst and second molecular sieve catalytic with different SCR performances positioned at same overall substrate
Agent combination is constituted, and preferably, the high-temperature behavior of the second catalyst is preferable for the low temperature active of the first catalyst, and the first catalyst is located at
The upstream of the second catalyst, the present invention can take into account optimal cryogenic property and the iron-based molecular sieve catalytic of cuprio molecular sieve catalyst
The optimal high-temperature behavior of agent.
The present invention is achieved by the following technical solutions：
The present invention relates to a kind of molecular sieve SCR catalytic unit of wide temperature window, including substrate and be arranged at this substrate
On two kinds of active coatings, wherein：Upstream active coating contains the first catalyst, and downstream activity coating contains the second catalyst,
And non-overlapping copies between the active coating of upstream and downstream.
The direction of described upstream and downstream is distinguished according to the direction that engine efflux flows through.
Described substrate using but be not limited to ceramic bases or metallic substrates.
The described upstream active coating containing the first catalyst refers to：Containing cuprio molecular sieve catalyst, energy under low temperature
Enough it is catalyzed NOXThere is SCR reaction, can be obtained by ion exchange or infusion process.
The described downstream activity coating containing the second catalyst refers to：Containing iron-based molecular sieve catalyst, under high temperature
NO can be catalyzedXThere is SCR reaction, can be obtained by ion exchange or infusion process.
Described molecular sieve includes but is not limited to BEA, MFI, MOR, CHA, FAU type molecular sieve.
The present invention relates to the preparation method of the molecular sieve SCR catalytic unit of above-mentioned wide temperature window, by upper in substrate
Trip and downstream are coated with successively and calcine the upstream active coating containing the first catalyst and the downstream activity containing the second catalyst
Coating.
Methods described specifically includes：Part of substrate is coated with the work containing the first catalyst by the side along base length direction
Property coating, after drying and calcination, this active coating is fixed in substrate and constitutes upstream active coating；Again from other direction by base
The remaining part active coating containing the second catalyst for the coating at bottom, after drying and calcination, this active coating is fixed in substrate
Constitute downstream activity coating.
Described upstream active coating is 1 with the coating length ratio of downstream activity coating:9～9:1.
Described upstream active coating, by the precursor solution of copper is mixed homogeneously in deionized water with molecular sieve,
After after the completion of ion-exchange reactionss or impregnation through filtering, being dried, obtain catalyst powder after roasting；Again by catalyst powder
Stir in deionized water with binding agent and ball milling after obtain apply serosity；Finally substrate one end be impregnated in serosity,
Drying, roasting both obtained.
Described binding agent using but be not limited to：Boehmite and SiO2Mixing suspension.
Described downstream activity coating, by the precursor solution of ferrum is mixed homogeneously in deionized water with molecular sieve,
After after the completion of ion-exchange reactionss or impregnation through filtering, being dried, obtain catalyst powder after roasting；Again by catalyst powder
Stir in deionized water with binding agent and ball milling after obtain apply serosity；Finally the substrate other end is not provided with upstream to live
Property coating partial immersion in serosity, drying, roasting are both.
Described binding agent using but be not limited to：Boehmite and SiO2Mixing suspension.
Technique effect
Compared with prior art, the preparation process of the present invention is simple, and preparation condition is easily controlled, and the combination of this method preparation divides
Sub- sieve catalyst has very wide active temperature windows, NO in 140～545 DEG CXMore than Transformation efficiency is up to 90 %.
Brief description
Fig. 1 is the NO of the combination catalyst of embodiments of the invention 1 preparationXConversion rate curve；
Fig. 2 is the schematic diagram of the combination catalyst of embodiments of the invention 1 preparation；
In figure：1 is upstream active coating, 2 is downstream activity coating.
Specific embodiment
Embodiment 1
The present embodiment comprises the following steps：
1) copper nitrate solution and SAPO34 molecular sieve are added in deionized water, stir, under room temperature, carry out ion
Exchange, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu SAPO34 molecular sieve SCR catalyst powder body for 4 hours.
Cu SAPO34 molecular sieve SCR catalyst powder body and binding agent are added in deionized water, stirs, after ball-milling technology is processed
Make coating serosity；The length of cordierite honeycomb ceramic carrier 50% is immersed in serosity, takes out after the completion of dipping, blow hole
Residual liquid in road, standby after 100 DEG C of dryings 4 hours, 550 DEG C of roastings 2 hours.
2) iron nitrate solution and ZSM 5 molecular sieve are added in deionized water, stir, under room temperature, carry out ion friendship
Change, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Fe ZSM 5 molecular sieve SCR catalyst powder body for 4 hours.Will
Fe ZSM 5 molecular sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology is made after processing
Coating serosity；The 50% length uncoated end leaching by the cordierite honeycomb ceramic carrier of above-mentioned coated copper zeolite catalyst
Stain, in serosity, is taken out after the completion of dipping, is blown residual liquid in duct, and 100 DEG C of dryings 4 hours, 550 DEG C of roastings obtain after 2 hours
Composite molecular sieve honeycomb catalyst is as shown in Figure 2.
If Fig. 1 is the NH of the composite molecular sieve honeycomb catalyst sample of embodiment 1 preparation3SCR reaction result, has good
Good reduction NOXActive and wider active temperature windows, NO in 140～545 DEG CXMore than Transformation efficiency is up to 90 %.Reaction condition
For：1000ppm NH3, 1000ppm NO, 5%O2, Balance Air is nitrogen, and air speed is 1.2 × 105h‐1.
Embodiment 2
The present embodiment comprises the following steps：
1) copper nitrate solution and SAPO34 molecular sieve are added in deionized water, stir, under room temperature, carry out ion
Exchange, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu SAPO34 molecular sieve SCR catalyst powder body for 4 hours.
Cu SAPO34 molecular sieve SCR catalyst powder body and binding agent are added in deionized water, stirs, after ball-milling technology is processed
Make coating serosity；The length of cordierite honeycomb ceramic carrier 50% is immersed in serosity, takes out after the completion of dipping, blow hole
Residual liquid in road, standby after 100 DEG C of dryings 4 hours, 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, under room temperature, carry out ion friendship
Change, then filter, be dried, roasting obtains Fe Beta molecular sieve SCR catalyst powder body.By Fe Beta molecular sieve SCR catalyst
Powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will be above-mentioned coated
50% length uncoated end of the cordierite honeycomb ceramic carrier of copper zeolite catalyst is immersed in serosity, takes after the completion of dipping
Go out, blow residual liquid in duct, 100 DEG C of dryings 4 hours, 550 DEG C of roastings obtain composite molecular sieve honeycomb catalyst after 2 hours.
Embodiment 3
The present embodiment comprises the following steps：
1) copper nitrate solution and Y molecular sieve are added in deionized water, stir, under room temperature, carry out ion exchange,
Then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu Y molecular sieve SCR catalyst powder body for 4 hours.By Cu Y molecule
Sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will
The length of cordierite honeycomb ceramic carrier 50% is immersed in serosity, takes out, blow residual liquid in duct after the completion of dipping, does 100
Standby after DEG C drying 4 hours, 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, under room temperature, carry out ion friendship
Change, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Fe Beta molecular sieve SCR catalyst powder body for 4 hours.By Fe
Beta molecular sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating after processing
Serosity；50% length uncoated end of the cordierite honeycomb ceramic carrier of above-mentioned coated copper zeolite catalyst is immersed in
In serosity, take out after the completion of dipping, blow residual liquid in duct, 100 DEG C of dryings 4 hours, 550 DEG C of roastings are combined after 2 hours
Molecular sieve honeycomb catalyst.
Embodiment 4
The present embodiment comprises the following steps：
1) copper nitrate solution and Y molecular sieve are added in deionized water, stir, under room temperature, carry out ion exchange,
Then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu Y molecular sieve SCR catalyst powder body for 4 hours.By Cu Y molecule
Sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will
The length of cordierite honeycomb ceramic carrier 50% is immersed in serosity, takes out, blow residual liquid in duct after the completion of dipping, 100 DEG C
Be dried 4 hours, standby after 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, under room temperature, carry out ion friendship
Change, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Fe Beta molecular sieve SCR catalyst powder body for 4 hours.By Fe
Beta molecular sieve SCR catalyst powder body adds in deionized water, adds modenite, obtains Fe Beta/Mor after drying, roasting
Molecular sieve catalyst powder body.Fe Beta/Mor molecular sieve SCR catalyst powder body and binding agent are added in deionized water, stirring
Uniformly, ball-milling technology makes coating serosity after processing；Cordierite honeycomb ceramic by above-mentioned coated copper zeolite catalyst
50% length uncoated end of carrier is immersed in serosity, takes out, blow residual liquid in duct, 100 DEG C of dryings 4 are little after the completion of dipping
When, 550 DEG C of roastings obtain composite molecular sieve honeycomb catalyst after 2 hours.
Embodiment 5
The present embodiment comprises the following steps：
1) copper nitrate solution and Y molecular sieve are added in deionized water, stir, under room temperature, carry out ion exchange,
Then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu Y molecular sieve SCR catalyst powder body for 4 hours.By Cu Y molecule
Sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will
The length of cordierite honeycomb ceramic carrier 50% is immersed in serosity, takes out, blow residual liquid in duct after the completion of dipping, 100 DEG C
Be dried 4 hours, standby after 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, impregnated under room temperature, so
110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Fe Beta molecular sieve SCR catalyst powder body for 4 hours afterwards.By Fe Beta molecular sieve
SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will be upper
The 50% length uncoated end stating the cordierite honeycomb ceramic carrier of coated copper zeolite catalyst is immersed in serosity, leaching
Take out after the completion of stain, blow residual liquid in duct, 100 DEG C of dryings 4 hours, 550 DEG C of roastings obtain composite molecular sieve honeycomb after 2 hours
Catalyst.
Embodiment 6
The present embodiment comprises the following steps：
1) copper nitrate solution and Y molecular sieve are added in deionized water, stir, impregnated under room temperature, then
110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu Y molecular sieve SCR catalyst powder body for 4 hours.Cu Y molecular sieve SCR is catalyzed
Agent powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；By cordierite honeycomb
The length of ceramic monolith 50% is immersed in serosity, takes out, blow residual liquid in duct after the completion of dipping, 100 DEG C of dryings 4 hours,
Standby after 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, impregnated under room temperature, so
110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Fe Beta molecular sieve SCR catalyst powder body for 4 hours afterwards.By Fe Beta molecular sieve
SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will be upper
The 50% length uncoated end stating the cordierite honeycomb ceramic carrier of coated copper zeolite catalyst is immersed in serosity, leaching
Take out after the completion of stain, blow residual liquid in duct, 100 DEG C of dryings 4 hours, 550 DEG C of roastings obtain composite molecular sieve honeycomb after 2 hours
Catalyst.
Embodiment 7
The present embodiment comprises the following steps：
1) copper nitrate solution and Y molecular sieve are added in deionized water, stir, under room temperature, carry out ion exchange,
Then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu Y molecular sieve SCR catalyst powder body for 4 hours.By Cu Y molecule
Sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will
30% length of cordierite honeycomb ceramic carrier is immersed in serosity, takes out, blow residual liquid in duct after the completion of dipping, 100 DEG C
Be dried 4 hours, standby after 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, under room temperature, carry out ion friendship
Change, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Beta molecular sieve SCR catalyst powder body for 4 hours.By Fe
Beta molecular sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating after processing
Serosity；70% length uncoated end of the cordierite honeycomb ceramic carrier of above-mentioned coated copper zeolite catalyst is immersed in
In serosity, take out after the completion of dipping, blow residual liquid in duct, 100 DEG C of dryings 4 hours, 550 DEG C of roastings are combined after 2 hours
Molecular sieve honeycomb catalyst.
Embodiment 8
The present embodiment comprises the following steps：
1) copper nitrate solution and Y molecular sieve are added in deionized water, stir, under room temperature, carry out ion exchange,
Then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Cu Y molecular sieve SCR catalyst powder body for 4 hours.By Cu Y molecule
Sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating serosity after processing；Will
60% length of cordierite honeycomb ceramic carrier is immersed in serosity, takes out, blow residual liquid in duct after the completion of dipping, 100 DEG C
Be dried 4 hours, standby after 550 DEG C of roastings 2 hours.
2) iron nitrate solution and Beta molecular sieve are added in deionized water, stir, under room temperature, carry out ion friendship
Change, then filter, 110 DEG C of dryings 2 hours, 500 DEG C of roastings obtain Beta molecular sieve SCR catalyst powder body for 4 hours.By Fe
Beta molecular sieve SCR catalyst powder body and binding agent add in deionized water, stir, and ball-milling technology makes coating after processing
Serosity；40% length uncoated end of the cordierite honeycomb ceramic carrier of above-mentioned coated copper zeolite catalyst is immersed in
In serosity, take out after the completion of dipping, blow residual liquid in duct, 100 DEG C of dryings 4 hours, 550 DEG C of roastings are combined after 2 hours
Molecular sieve honeycomb catalyst.
Above-mentioned be embodied as can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference
Mode local directed complete set is carried out to it, protection scope of the present invention is defined by claims and is not embodied as institute by above-mentioned
Limit, each implementation in the range of it is all by the constraint of the present invention.
Claims (10)
1. a kind of molecular sieve SCR catalytic unit of wide temperature window is it is characterised in that including substrate and being arranged in this substrate
Two kinds of active coatings, wherein：Upstream active coating contains the first catalyst, and downstream activity coating contains the second catalyst, and
Non-overlapping copies between the active coating of upstream and downstream；
The described upstream active coating containing the first catalyst refers to：Containing cuprio molecular sieve catalyst；
The described downstream activity coating containing the second catalyst refers to：Containing iron-based molecular sieve catalyst.
2. molecular sieve SCR catalytic unit according to claim 1, is characterized in that, the direction root of described upstream and downstream
Distinguish according to the direction that engine efflux flows through.
3. molecular sieve SCR catalytic unit according to claim 1, is characterized in that, described substrate adopt ceramic bases or
Metallic substrates.
4. molecular sieve SCR catalytic unit according to claim 1, is characterized in that, described molecular sieve includes：BEA、MFI、
MOR, CHA, FAU type molecular sieve.
5. a kind of preparation method of the molecular sieve SCR catalytic unit of the wide temperature window according to any of the above-described claim,
It is characterized in that, be coated with successively by the upstream and downstream in substrate and calcine the upstream active coating containing the first catalyst and
Downstream activity coating containing the second catalyst.
6. preparation method according to claim 5, is characterized in that, specifically includes：Along base length direction side by portion
Divide the substrate active coating containing the first catalyst for the coating, after drying and calcination, this active coating is fixed in substrate on constituting
Trip active coating；From other direction, the remaining part of substrate is coated with the active coating containing the second catalyst again, is dried and forges
After burning, this active coating is fixed on composition downstream activity coating in substrate.
7. the preparation method according to claim 5 or 6, is characterized in that, described upstream active coating, by by before copper
Drive liquid solution to mix homogeneously in deionized water with molecular sieve, treat after the completion of ion-exchange reactionss or impregnation through filtering, doing
Catalyst powder is obtained after dry, roasting；Again catalyst powder and binding agent are stirred in deionized water and ball milling after
To coating serosity；Finally substrate one end be impregnated in serosity, drying, roasting both obtained.
8. preparation method according to claim 7, is characterized in that, described binding agent adopts boehmite and SiO2's
Mixing suspension.
9. the preparation method according to claim 5 or 6, is characterized in that, described downstream activity coating, by by before ferrum
Drive liquid solution to mix homogeneously in deionized water with molecular sieve, treat after the completion of ion-exchange reactionss or impregnation through filtering, doing
Catalyst powder is obtained after dry, roasting；Again catalyst powder and binding agent are stirred in deionized water and ball milling after
To coating serosity；Finally the substrate other end is not provided with the partial immersion of upstream active coating in serosity, drying, roasting were both
?.
10. preparation method according to claim 9, is characterized in that, described binding agent adopts boehmite and SiO2's
Mixing suspension.
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| CN111530463A (en) * | 2020-05-01 | 2020-08-14 | 西安交通大学 | Denitration catalyst of honeycomb ceramic load double oxide rice hull ash carrier, preparation method and application |
| 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 |
| CN114904568A (en) * | 2022-04-14 | 2022-08-16 | 中化学科学技术研究有限公司 | SCR catalyst and preparation method thereof |
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