CN109678176A - The synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable - Google Patents
The synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/36—Pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
- C01B39/38—Type ZSM-5
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- C01P2004/00—Particle morphology
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- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
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Abstract
The invention belongs to zeolite molecular sieve synthetic technology field, the synthetic method of specially a kind of needle-shaped ZSM-5 molecular sieve of size tunable.Sized zeolite particles size and pattern are an important factor for influencing molecular sieve catalytic performance.The present invention mainly passes through simple adjustment silicon source and the silicon source degree of polymerization, using mixed templates, can effectively control sized zeolite particles, while obtaining needle-shaped pattern zeolite.This method synthesis step is very easy, is easy to industrialize.Sample XRD and SEM show that the silicon degree of polymerization changes so that sized zeolite particles are effectively controlled.
Description
Technical field
The invention belongs to zeolite molecular sieve synthetic technology field, specially a kind of needle-shaped ZSM-5 molecular sieve of size tunable
Synthetic method.
Background technique
Zeolite is a kind of microporous crystalline SiClx aluminate (aluminosilicate), the common oxygen-octahedron of skeleton and
Aluminum-oxygen tetrahedron is interconnected to constitute that (chemical general formula is [M by covalent bond2(I),M(II)]O·Al2O3·nSiO2·mH2O,
(wherein, M (I) and M (II) is respectively monovalence and divalent metal (usually Na, Ca, Ka etc., n are Zeolite)).ZSM-5
Zeolite belongs to second generation zeolite, has typical MFI structure.Due to the straight channel system of special two dimension and intersection duct knot
Structure, higher hydrothermal stability, shape selectivity and oleophilic drainage ability, ZSM-5 have gradually developed into petrochemical industry first choice
Catalysis material.
CN201210073742.8 provides a kind of preparation method of ZSM-5 zeolite molecular sieve microsphere, and utilization is methylic
Organosiloxane and ethyl orthosilicate make silicon source one-step method and prepare ZSM-5 zeolite molecular sieve microsphere, and microballoon is by tiny ZSM-5
Zeolite grain composition, change the additive amount containing methylsiloxane, the size of microballoon can be adjusted at 3-8 μm, and ZSM-5 zeolite point
Son sieve Microsphere Size it is uniform, good dispersion, preparation process is simple, be easy to largely prepare, can catalysis, absorption and in terms of
It is applied.CN200510028781.6 is related to a kind of control sized zeolite particles, the method for preparing small crystal grain ZSM-5 zeolite.Pass through
Using waterglass, silica solution or white carbon black as silicon source, aluminium salt or aluminate are silicon source, the mol ratio of reaction mixture: XNa2O∶
YAl2O3∶100SiO2∶ZH2O, wherein X=4~36, Y=0~3, Z=1400~6000 add before crystallization into crystallization mother liquor
Enter a small amount of seeding director, the technical solution of the ZSM-5 zeolite of little crystal grain is obtained through crystallization, it is big preferably to control sized zeolite particles
It is small.It solves to exist in small-grain ZSM-5 zeolite preparation method in conventional art using more template, crystallization time length, cost
Higher and big environmental pollution problem.CN200910072747.7, which is described, a kind of is added to Template-free method for pre- crystallization crystal seed
Synthesize nano-ZSM-5 molecular sieve gel rubber system in, crystallization 24 hours at 160~180 DEG C, be cooled to room temperature by product from
The heart is filtered, washed, dries, roasts, and high aggregation, nanometer without stray crystal phase is made in the method for controlling ZSM-5 molecular sieve partial size
Scale crystalline has the advantages that at low cost, environmentally friendly.CN200510200328.9 describes a kind of high silica alumina ratio ZSM-5 zeolite point
Son sieve size controlling method added it in the aluminum salt solution of acidification using surfactant, then will by waterglass,
Template, crystal seed are formed by alkaline solution and are added drop-wise in aluminum salt solution at leisure, and the mixture total composition of gained reaction meets
Na2O∶Al2O3∶SiO2∶H2The molar ratio of O=1.5-4.0:1:20-280:500-2000, then routinely by the reaction mixture
Method hydrothermal crystallizing.Small crystal grain ZSM-5 zeolite molecular sieve synthesized by this method, silica alumina ratio is high, and even grain size.
CN200810204150.9 discloses a kind of control ZSM-5 molecular sieve partial size and obtains the synthetic method of nano zeolite, by meta-aluminic acid
Reaction mixture is made in sodium or aluminum sulfate, silica solution or waterglass, sodium hydroxide and isopropylamine, then reaction mixture is carried out water
Thermal crystallisation, the good reaction mixture of last hydrothermal crystallizing are filtered, washed, dry, roast through conventional, obtain nano-ZSM-5 molecule
Sieve.The average diameter of synthesized ZSM-5 molecular sieve crystal grain cross-section is not more than 100nm, specific surface area with higher, production stream
The advantages of journey is short, at low cost, is conducive to industrialized production and application.
In above patent the method, the method for controlling sized zeolite particles size is cumbersome, and gained sample is nanometer spherical.
Summary of the invention
The technical problem to be solved by the present invention is to the prior arts to obtain different-grain diameter zeolite especially acicular nanometer ZSM-5
Zeolite molecular sieve, preparation process is cumbersome, crystallization time is long, higher cost and environmental pollution are big, is not easy to industrialize.The present invention
A kind of method of new control ZSM-5 molecular sieve partial size is provided, sized zeolite particles can effectively be controlled by having, and obtain nanometer, micron
The characteristics of needle-shaped ZSM-5 molecular sieve.
In order to solve the above technical problems, technical solution of the present invention is as follows:
The synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable, it is characterised in that specific steps are as follows:
Water, template T1, template T2, silicon source, the mol ratio of silicon source in system are as follows:
H2O/SiO2=5-500；T1/SiO2=0.1-100；T2/SiO2=0.1-100；Under the conditions of Si/Al=50- ∞,
The degree of polymerization is defined as: with repetitive unit SiO2Several or Al (OH)3On the basis of, i.e. contained number of repeat unit on polymer macromolecule chain
Purpose average value, is defined as n；In crystallization kettle, gel aging 0-120 hours at room temperature, in 50- between 60-300 DEG C
1000rpm stirs crystallization 1-15 days lower；After being cooled to room temperature, product is washed and is centrifuged, after drying, obtains different-grain diameter size
ZSM-5 zeolite；The template T1 is 4-propyl bromide, tetrapropylammonium hydroxide, 4 bromide, tetraethyl bromination
Ammonium, tetramethylammonium hydroxide, tetraethyl ammonium hydroxide, hexamethylene diisocyanate, hexamethylene diamine, hexa
And its at least one of derivative (methenamine and its derivative), template T2 triethylenediamine, cyclic ethylene imines,
At least one of quinoline, aliphatic cyclic amine.
In above-mentioned technical proposal, the silicon source in the system uses hydroxide treatment in advance, to control the silicon source degree of polymerization, or
Person, the silicon source in the system uses mineral acid treatment in advance, to control the silicon source degree of polymerization.
In above-mentioned technical proposal, the aliphatic cyclic amine includes cyclohexylamine.
In above-mentioned technical proposal, before the silicon source or source of aluminium addition system, first passes through calculating and determine the silicon source degree of polymerization
Or the silicon source degree of polymerization.
The calculation method of the silicon source degree of polymerization or the silicon source degree of polymerization is as follows: the average molecular weight D of silicon source or silicon source is measured,
D is divided by repetitive unit SiO later2Or the degree of polymerization is calculated in 3 molecular weight of Al (OH).Utilize small angle x-ray diffraction (SAXD) method, end
Base analysis, film osmosis, electron microscope, equilibrium sedimentation light scattering method, the equilibrium sedimentation in density gradient or low-angle X are penetrated
The methods of line diffraction measures average molecular weight D.In embodiment 1, the silicon source degree of polymerization is 200, passes through small angle x-ray diffraction (SAXD) method
The average molecular weight D for measuring silica solution is 12000, D divided by repetitive unit SiO2Molecular weight 60 is calculated 200.
In above-mentioned technical proposal, it is preferred that the hydroxide is sodium hydroxide or potassium hydroxide.Above-mentioned technical proposal
In, it is preferred that the inorganic acid is nitric acid, at least one of hydrochloric acid.
In above-mentioned technical proposal, it is preferred that n when the system silicon degree of polymerization is high≥400, it is big for obtaining nano zeolite particle size range
In 6 microns, n < 400 when the system silicon degree of polymerization is low, obtaining nano zeolite particle size range is less than 5 microns.It is further preferable that system
The silicon degree of polymerization is 400≤n≤10000, and nano zeolite particle size range is 6-50 microns；The silicon degree of polymerization is 1 n < 400 <, is received
Rice sized zeolite particles range is 0.05-5 microns.In a specific embodiment of the invention, the control silicon degree of polymerization is 1500, sized zeolite particles
It is 15 microns.
In above-mentioned technical proposal, it is preferred that n when the system aluminium degree of polymerization is high>500, it is big for obtaining nano zeolite particle size range
In 6 microns, n < 500 when the system aluminium degree of polymerization is low, obtaining nano zeolite particle size range is less than 5 microns.It is further preferable that system
The aluminium degree of polymerization is 500≤n≤5000, and nano zeolite particle size range is 6-50 microns；The aluminium degree of polymerization is 1 n < 500 <, obtains nanometer
Sized zeolite particles range is 0.05-5 microns.In a specific embodiment of the invention, the control aluminium degree of polymerization is 600, and sized zeolite particles are
12 microns.
In above-mentioned technical proposal, revolving speed is preferably 150-250rpm in crystallization process.
In above-mentioned technical proposal, silicon source is preferably silica solution, ethyl orthosilicate or amorphous silicon oxide powder, in silicate
At least one, silicon source are preferably at least one of Patent alum, aluminium isopropoxide or meta-aluminate, aluminate.
In above-mentioned technical proposal, crystallization time is preferably 1-3 days；Crystallization temperature preferred scope is 100-200 DEG C.
In above-mentioned technical proposal, it is slowly added to silicon source dropwise in whipping process or is slowly added to dropwise in whipping process
Silicon source.Silicon source i.e. in system be slowly added to dropwise in whipping process or system in silicon source be in whipping process by
Drop is slowly added to.
In above-mentioned technical proposal, H2O/SiO2Preferred scope is 5-200.
In above-mentioned technical proposal, T1/SiO2Preferred scope is 0.1-50；T2/SiO2Preferred scope is 0.2-30.
In above-mentioned technical proposal, the molar ratio of the template T1 and template T2 are preferably 0.05-0.5.More preferably
Ground, 0.1-0.4.
The present invention mainly changes silicon source and the silicon source degree of polymerization is different, using template T1 and template T2, controls needle-shaped
ZSM-5 zeolite partial size obtains the sample with good crystallinity different sizes, and carries out table to sample with XRD and SEM
Sign.
Product of the invention is needle-shaped ZSM-5 molecular sieve, by the difference, the adjusting template that adjust silicon source or the silicon source degree of polymerization
The ratio of agent T1 and T2 and silicon, aluminium, are stirred in crystallization process, can effectively control sample crystallite dimension and pattern,
Obtain the different needle-shaped ZSM-5 zeolite of partial size.Meanwhile the synthetic method obtains different-grain diameter zeolite especially nano-ZSM-5 and boils
Stone molecular sieve.The present invention provides a kind of method of new control ZSM-5 molecular sieve partial size, and zeolite grain can effectively be controlled by having
Diameter, the characteristics of obtaining acicular nanometer, micron ZSM-5 molecular sieve.Combined coefficient not only can be improved using this method, shorten crystallization
Time reduces synthesis cost, can also reduce environmental pollution, and has better practicability and validity.This method synthesis point
The step of son sieve has obtained unexpected technical effect, avoids different solutions configuration in traditional preparation methods and mixes is numerous
It is trivial, it is more applicable in industrialization, it is simple and feasible.
The 0.5-1.5 microns of needle-shaped ZSM-5 zeolites of partial size prepared by this method are applied in olefin cracking reaction, reaction
At 550 DEG C of temperature, after 6 hours reaction time, ZSM-5 catalyst has good catalytic effect, and butene conversion reaches
100%, Propylene Selectivity reaches 80%.
Following example will make furtherly the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable provided by the invention
It is bright.
Specific embodiment
Embodiment 1
Synthetic method: 15g water, 0.051g Patent alum, 12g tetrapropylammonium hydroxide, 16g cyclohexylamine are added
In reaction kettle, after mixing evenly, it is slowly added to the silica solution that 15g mass fraction is 40%, the silicon dropwise in whipping process
Colloidal sol measures being averaged for silica solution by small angle x-ray diffraction (SAXD) method method by the way that 2.3g naoh treatment is added in advance
Molecular weight D is 12000, D divided by repetitive unit SiO2Molecular weight 60 calculates, and the control silicon degree of polymerization obtains 200, stirs 30min, room
The lower gel aging of temperature.Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing is centrifuged 3 times,
80 DEG C of drying 12h, obtain final products Z-1.
Fig. 1 is the XRD spectra of 1 products therefrom of embodiment, it can be seen that product has the characteristic diffraction peak of ZSM-5, and
Crystallinity with higher.Fig. 2 is the SEM photograph of products obtained therefrom, it can be seen that needle-shaped pattern, particle diameter size is presented in sample
About 0.5-1.5 microns.
Embodiment 2
The positive silicon of 6.93g is slowly added to dropwise in whipping process after mixing evenly using with the same terms in example 1
Acetoacetic ester, the ethyl orthosilicate are 80 by the way that 3g naoh treatment, the control silicon degree of polymerization are added in advance, stir 30min, room
The lower gel aging of temperature.Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing is centrifuged 3 times,
80 DEG C of drying 12h, obtain final products Z-2.Sample XRD characterization result, it can be seen that product has ZSM-5 characteristic diffraction peak,
Products obtained therefrom SEM photograph illustrates that needle-shaped pattern is presented in sample, and particle diameter size is 100-200 nanometers.
Embodiment 3
2g silicon powder, institute are slowly added to dropwise in whipping process after mixing evenly using with the same terms in example 1
It is 100 that silicon powder, which is stated, by the way that 2.5 naoh treatments, the control silicon degree of polymerization are added in advance, stirs 30min, at room temperature gel aging.
Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing is centrifuged 3 times, 80 DEG C of drying 12h,
Obtain final products Z-3.Sample XRD characterization result, it can be seen that product has ZSM-5 characteristic diffraction peak, and products obtained therefrom SEM shines
Piece illustrates that needle-shaped pattern is presented in sample, and particle diameter size is 1-2 microns.
Embodiment 4
Synthetic method: 15g water, 0.016g aluminium isopropoxide, 9g tetrapropylammonium hydroxide, 16g morpholine are added in reaction kettle,
After mixing evenly, it is slowly added to the silica solution that 15g mass fraction is 40% dropwise in whipping process, the aluminium isopropoxide passes through
1g sulfuric acid treatment is added in advance, the control aluminium degree of polymerization is 8, stirs 30min, at room temperature gel aging.Later, 180 DEG C, 150rpm
It stirs lower crystallization 2 days, after being cooled to room temperature, deionized water washing is centrifuged 3 times, 80 DEG C of drying 12h, obtains final products Z-4.Sample
Product XRD characterization result, it can be seen that product has ZSM-5 characteristic diffraction peak, and products obtained therefrom SEM photograph illustrates that needle is presented in sample
Shape pattern, particle diameter size are 1 microns.
Embodiment 5
Using with the same terms in example 4, change silicon source is 0.013g sodium aluminate, and the sodium aluminate by being added in advance
1.3g sulfuric acid, the control aluminium degree of polymerization are 5, obtain final products Z-5.Sample XRD characterization result, it can be seen that product has ZSM-
5 characteristic diffraction peaks, products obtained therefrom SEM photograph illustrate that needle-shaped pattern is presented in sample, and granular size is 3 microns.
Embodiment 6
Synthetic method: by 15g water, 0.051g Patent alum, 12g 4-propyl bromide, morpholine dosage be 28g,
The silica solution is 1500 by the way that 0.5g naoh treatment, the control silicon degree of polymerization are added in advance, is added in reaction kettle, stirring is equal
After even, it is slowly added to the silica solution that 5g mass fraction is 40% dropwise in whipping process, stirs 30min, gel is old at room temperature
Change.Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing centrifugation 3 times, 80 DEG C dry
12h obtains final products.Sample XRD characterization result, it can be seen that product has ZSM-5 characteristic diffraction peak, SEM photograph explanation
Needle-shaped pattern is presented in sample, and granular size is 15 microns.
Embodiment 7
The positive silicon of 6.93g is slowly added to dropwise in whipping process after mixing evenly using with the same terms in example 6
Acetoacetic ester, the ethyl orthosilicate are 1800 by the way that the processing of 0.5g potassium hydroxide solution, the control silicon degree of polymerization are added in advance, stirring
30min, at room temperature gel aging.Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water is washed
Centrifugation 3 times, 80 DEG C of drying 12h obtain final products.Sample XRD characterization result, it can be seen that there is product ZSM-5 feature to spread out
Peak is penetrated, SEM photograph illustrates that needle-shaped pattern is presented in sample, and granular size is 20 microns.
Embodiment 8
2g silicon powder, institute are slowly added to dropwise in whipping process after mixing evenly using with the same terms in example 6
It is 1800 that silicon powder, which is stated, by the way that the processing of 0.8 potassium hydroxide solution, the control silicon degree of polymerization are added in advance, stirs 30min, at room temperature gel
Aging.Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing centrifugation 3 times, 80 DEG C dry
12h obtains final products.Sample XRD characterization result, it can be seen that product has ZSM-5 characteristic diffraction peak, SEM photograph explanation
Needle-shaped pattern is presented in sample, and granular size is 23 microns.
Embodiment 9
Synthetic method: 15g water, 0.016g aluminium isopropoxide, 3g 4-propyl bromide, 10g cyclohexylamine are added in reaction kettle,
After mixing evenly, it is slowly added to the silica solution that 5g mass fraction is 40% dropwise in whipping process, the aluminium isopropoxide passes through
0.3g sulfuric acid treatment is added in advance, the control aluminium degree of polymerization is 600, stirs 30min, at room temperature gel aging.Later, 180 DEG C,
150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing is centrifuged 3 times, 80 DEG C of drying 12h, is finally produced
Product.Sample XRD characterization result, it can be seen that product has ZSM-5 characteristic diffraction peak, and SEM photograph illustrates that needle-shaped shape is presented in sample
Looks, granular size are 12 microns.
Embodiment 10
Using with the same terms in example 9, change silicon source is 0.013g sodium aluminate, the aluminium isopropoxide by advance plus
Enter 0.3g sulfuric acid treatment, the control aluminium degree of polymerization obtains final products for 700.Sample XRD characterization result, it can be seen that product has
ZSM-5 characteristic diffraction peak, SEM photograph illustrate that needle-shaped pattern is presented in sample, and granular size is 10 microns.
Comparative example 1
Using the identical condition of embodiment 1, changing template is 13g 4-propyl bromide and 16g n-hexylamine, gained sample
For bulk morphologies, size is 1-2 microns, non-needle-shaped pattern.
Comparative example 2
Using embodiment the same terms, silicon source or the silicon source degree of polymerization are not controlled, and 15g water, 0.051g 18 water are closed into sulfuric acid
Aluminium, 12g tetrapropylammonium hydroxide, 16g cyclohexylamine are added in reaction kettle, and after mixing evenly, it is 40% that 15g mass fraction, which is added,
Silica solution stirs 30min, at room temperature gel aging.Later, 180 DEG C, crystallization 2 days under 150rpm is stirred, after being cooled to room temperature,
Deionized water washing centrifugation 3 times, 80 DEG C of drying 12h, obtaining final products is needle-shaped pattern, but particle size distribution is very not
It is uniform.
Comparative example 3
Synthetic method: 15g water, 0.051g Patent alum, 0.1g tetrapropylammonium hydroxide, 16g cyclohexylamine are added
Enter in reaction kettle, after mixing evenly, is slowly added to the silica solution that 15g mass fraction is 40% dropwise in whipping process, it is described
Silica solution measures the flat of silica solution by the way that 2.3g naoh treatment is added in advance, by small angle x-ray diffraction (SAXD) method method
Average molecular weight D is 12000, D divided by repetitive unit SiO2Molecular weight 60 calculates, and the control silicon degree of polymerization obtains 200, stirs 30min,
Gel aging at room temperature.Later, 180 DEG C, 150rpm is stirred lower crystallization 2 days, after being cooled to room temperature, and deionized water washing is centrifuged 3
Secondary, 80 DEG C of drying 12h, obtaining final products is 1-5 microns bulk morphologies zeolite.
Claims (10)
1. a kind of synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable, it is characterised in that specific steps are as follows:
Water, template T1, template T2, silicon source, the mol ratio of silicon source in system are as follows:
H2O/SiO2=5-500；T1/SiO2=0.1-100；T2/SiO2=0.1-100；Under the conditions of Si/Al=50- ∞, Yu Jinghua
In reaction kettle, gel aging 0-120 hours, between 60-300 DEG C crystallization 1-15 days under 50-1000rpm stirring；It is cooled to room
Product is washed and is centrifuged, after drying, obtains the acicular ZSM-5 zeolite of different-grain diameter size by Wen Hou；The template T1 is 4 third
Base ammonium bromide, tetrapropylammonium hydroxide, 4 bromide, tetraethylammonium bromide, tetramethylammonium hydroxide, tetraethyl hydroxide
At least one of ammonium, hexamethylene diisocyanate, hexamethylene diamine, hexa and its derivative, template T2
For at least one of triethylenediamine, cyclic ethylene imines, morpholine, aliphatic cyclic amine；
The silicon source uses hydroxide treatment in advance, to control the silicon source degree of polymerization, alternatively, source of aluminium uses mineral acid in advance
Reason, to control the silicon source degree of polymerization；The degree of polymerization is defined as: with repetitive unit SiO2Several or Al (OH)3On the basis of, i.e., polymer divides greatly
Contained number of repeat unit purpose average value, is defined as n in subchain.
2. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, which is characterized in that the silicon
Source is at least one of silica solution, ethyl orthosilicate or amorphous silicon oxide powder, silicate；
Source of aluminium is at least one of Patent alum, aluminium isopropoxide or meta-aluminate, aluminate.
3. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, which is characterized in that H2O/SiO2
For 5-200, T1/SiO2For 0.1-50, T2/SiO2For 0.2-30.
4. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, which is characterized in that in system
Silicon source be added dropwise in whipping process or system in silicon source be to be added dropwise in whipping process.
5. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, which is characterized in that the hydrogen
Oxide is sodium hydroxide or potassium hydroxide.
6. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, which is characterized in that the nothing
Machine acid is sulfuric acid, nitric acid, at least one of hydrochloric acid.
7. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, it is characterised in that system silicon is poly-
Right n>=400, obtaining nano zeolite particle size range is greater than 6 microns, and system silicon polymerization degree n<400 obtain nano zeolite partial size
Range is less than 5 microns.
8. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, it is characterised in that system silicon is poly-
Right is 400≤n≤10000, and nano zeolite particle size range is 6-50 microns；The silicon degree of polymerization is 1 n < 400 <, obtains nanometer boiling
Stone particle size range is 0.05-5 microns.
9. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, it is characterised in that system aluminium is poly-
N>=500 when right high, obtaining nano zeolite particle size range is greater than 6 microns, and n<500 when the system aluminium degree of polymerization is low obtain nanometer
Sized zeolite particles range is less than 5 microns.
10. the synthetic method of the needle-shaped ZSM-5 molecular sieve of size tunable according to claim 1, it is characterised in that system aluminium
The degree of polymerization is 500≤n≤5000, and nano zeolite particle size range is 6-50 microns；The aluminium degree of polymerization is 1 n < 500 <, obtains nanometer boiling
Stone particle size range is 0.05-5 microns.
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| CN110642264A (en) * | 2019-11-11 | 2020-01-03 | 湘潭大学 | Synthesis method of nano needle-shaped ZSM-11 and mixed crystal molecular sieve thereof |
| CN114436283A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Method for simultaneously synthesizing molecular sieves with two particle sizes |
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| CN105523568A (en) * | 2014-10-24 | 2016-04-27 | 中国石油化工股份有限公司 | One-dimensional rod-like ZSM-5 molecular sieve and synthesis method thereof |
| CN106629767A (en) * | 2015-11-02 | 2017-05-10 | 中国石油化工股份有限公司 | Method for effectively controlling particle size of ZSM-5 by virtue of silicon polymerization degree and aluminum polymerization degree |
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| CN105523568A (en) * | 2014-10-24 | 2016-04-27 | 中国石油化工股份有限公司 | One-dimensional rod-like ZSM-5 molecular sieve and synthesis method thereof |
| CN106629767A (en) * | 2015-11-02 | 2017-05-10 | 中国石油化工股份有限公司 | Method for effectively controlling particle size of ZSM-5 by virtue of silicon polymerization degree and aluminum polymerization degree |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110642264A (en) * | 2019-11-11 | 2020-01-03 | 湘潭大学 | Synthesis method of nano needle-shaped ZSM-11 and mixed crystal molecular sieve thereof |
| CN110642264B (en) * | 2019-11-11 | 2020-12-29 | 湘潭大学 | Synthesis method of nano needle-shaped ZSM-11 and mixed crystal molecular sieve thereof |
| CN114436283A (en) * | 2020-10-20 | 2022-05-06 | 中国石油化工股份有限公司 | Method for simultaneously synthesizing molecular sieves with two particle sizes |
| CN114436283B (en) * | 2020-10-20 | 2024-01-26 | 中国石油化工股份有限公司 | Method for synthesizing molecular sieves with two granularities simultaneously |
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