CN106185979B - A kind of preparation method of multi-stage porous ZSM-5 molecular sieve - Google Patents
A kind of preparation method of multi-stage porous ZSM-5 molecular sieve Download PDFInfo
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- CN106185979B CN106185979B CN201610527651.5A CN201610527651A CN106185979B CN 106185979 B CN106185979 B CN 106185979B CN 201610527651 A CN201610527651 A CN 201610527651A CN 106185979 B CN106185979 B CN 106185979B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- 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
- C01B39/40—Type ZSM-5 using at least one organic template directing agent
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
Abstract
The present invention discloses a kind of preparation method of multi-stage porous ZSM-5 molecular sieve, the following steps are included: by a certain amount of solid material silicon source, alkali source, mineralizer and template mixed grinding to uniform, then it seals, in 150-180 DEG C of progress crystallization, product is washed, filtering, dries, obtains multi-stage porous ZSM-5 molecular sieve after high-temperature calcination；The method of the invention, as silicon source, reduces the cost of synthesis process using cheap nonmetallic mineral diatomite；The macroporous structure of diatomite is that synthesis multilevel hole material is laid a good foundation simultaneously；In addition, synthetic method is solid phase solventless method, one step of synthesis process is completed, and generated time is shortened, and reduces energy consumption, while avoiding use secondary pollution caused by environment of solvent in prior synthesizing method, the method for the invention is low in cost, quick, environmentally friendly.
Description
Technical field
The present invention relates to a kind of preparation methods of multi-stage porous ZSM-5 molecular sieve, belong to molecular screen material preparation technical field.
Background technique
Micropore, mesoporous, large pore material have been achieved for very big progress, and are widely used in many science and technology
Field.However researcher has found that micropore, mesoporous, large pore material have respective advantage and disadvantage, single cellular structure is largely
On limit its practical application, then, the comprehensive various pore structure material advantages of researcher are prepared with hierarchical porous structure
New material, referred to as multistage porous molecular sieve, multi-stage porous composite molecular screen have the pore structure and preferable acidity of classification, can effectively reduce
Micropore diffusional resistance adversely affects mass transfer bring, it is made to have broad application prospects in terms of the reaction of macromolecular.
For diatomite as a kind of siliceous sedimentary rock, size is generally several to tens microns, has macropore duct knot
Structure, and stability is strong, porosity is high, and main component is amorphous Si O2, content is generally 80-95%, and impurity component has
Na2O、K2O、MgO、Fe2O3、Al2O3Deng, but as cheap nonmetallic mineral, diatomite is mainly used in compound fertilizer at present
The low sides fields such as industry, building heat preservation industry, rubber industry, paper-making industry, paint industry.According to diatomite physical and chemical performance analysis shows,
Diatomite has SiO2The excellent features such as content height, macropore, high porosity are ideal multi-stage porous molecular screen materials
Raw material is prepared, so the application of diatomite can be effectively introduced into field of material preparation, reinforces its added value, to avoid resource wave
Take.
ZSM-5 molecular sieve have uniform sequential microcellular structure, biggish specific surface area, Kong Rong and thermal stability, extensively
Applied to petroleum refining and chemical industry catalytic process.However, because its lesser aperture keeps reactant/product tired in active site mass transfer
Difficulty, the product formed in duct cannot quickly escape etc. limit its macromolecular in terms of apply.It grinds
Study carefully and show the molecular sieve with macropore or meso-hole structure, diffusion rate can be effectively improved, expanded answering for micro porous molecular sieve significantly
With range, the method for synthesizing multistage porous molecular sieve at present has soft template method, hard template method, outgrowth method and nanoclusters self-assembly
Deng, but the problem that synthesis process is complicated, cost of material is high, energy consumption is high etc. has seriously affected its process of industrialization.
By XRD characterization means, it was demonstrated that the method synthesizes the ZSM-5 product with MFI structure.Synthetic product not only has
There is the characteristics of Large ratio surface of ZSM-5 molecular sieve, while remaining the macropore duct of diatomite, diffusional resistance can be reduced, had
Conducive to the diffusion of reactant/product molecule, its application field has effectively been expanded.
Summary of the invention
To solve the above problems, the present invention provides a kind of preparation method of multi-stage porous ZSM-5 molecular sieve, specifically include following
Step:
(1) according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰ 0.4-0.5 ︰ 0.08-0.1 ︰ 0.7-0.9, respectively
Solid silicon source, alkali source, template, mineralizer are weighed, grinds 10-15min after mixing, is allowed to uniformly mixed, obtains paste；
(2) paste for obtaining step (1) seals, and after 150-180 DEG C of reaction 8-36h, is cooled to room temperature；
(3) it is filtered after sufficiently washing the product that step (2) obtains to neutrality with deionized water, filter cake is dry at 50-100 DEG C
Dry 3-12h；
(4) product for obtaining step (3) is in 500-550 DEG C of roasting 3-6h to get multi-stage porous ZSM-5 molecular sieve.
Preferably, the silicon source is diatomite, and the mass percentage of silica is higher than 90% in diatomite.
Preferably, the alkali source is the Na containing the crystallization water2SiO3。
Preferably, the template is 4-propyl bromide, 4-propyl ammonium chloride, tetrapropyl ammonium iodide or tetrapropyl sulfuric acid
Hydrogen ammonium.
Preferably, the mineralizer is ammonium chloride or ammonium fluoride.
The invention has the benefit that
(1) diatomite has good utility value as cheap nonmetal mineral resource, can be used to instead of ZSM-5 points
Expensive silicon source substance in son sieve production process.
(2) diatomite itself has macropore cellular structure, and stability is strong, and porosity is high, to accelerate reaction speed, expands
The application of micro porous molecular sieve provides precondition.
(3) solid phase uninanned platform method greatly reduces the use of reaction process solvent, avoids secondary pollution, and reacted
Journey is easy, quick, greatly shortens generated time, reduces energy consumption.
Detailed description of the invention
Fig. 1 is the XRD diagram in 1 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 2 is to scheme in the SEM of 1 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 3 is the XRD diagram in 2 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 4 is the XRD diagram in 3 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 5 is to scheme in the SEM of 3 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 6 is the XRD diagram in 4 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 7 is the XRD diagram in 5 gained multi-stage porous ZSM-5 molecular sieve of embodiment；
Fig. 8 is the XRD diagram in 6 gained multi-stage porous ZSM-5 molecular sieve of embodiment.
Specific embodiment
The present invention is described further in the following with reference to the drawings and specific embodiments, but protection scope of the present invention is not
It is limited to the content.
Embodiment 1
The preparation method of multi-stage porous ZSM-5 molecular sieve described in the present embodiment, specifically includes the following steps:
(1) raw material are weighed according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰, 0.46 ︰, 0.09 ︰ 0.8 ratio,
Wherein, silicon source is Aladdin chemistry pure silicon diatomaceous earth (content of silica is 92%), alkali source Na2SiO3·9H2O, template
For 4-propyl bromide, mineralizer is ammonium chloride, and the actual amount of silicon is silicon and Na in diatomite2SiO3·9H2Silicon in O it
With weigh 0.35g Aladdin chemistry pure silicon diatomaceous earth, 1.32gNa respectively2SiO3·9H2O, 0.24g 4-propyl bromide and 0.43g
Ammonium chloride is placed in mortar, by the grinding of 13min, is allowed to uniformly mixed, is obtained paste；
(2) paste that step (1) obtains is moved into 100mL reaction kettle and is sealed, after 180 DEG C of reactions for 24 hours, be cooled to room
Temperature；
(3) product that step (2) obtains sufficiently is dissolved with deionized water, is filtered after washing insoluble matter to neutrality, then
For filter cake in 100 DEG C of heat preservation 8h, product is dry complete；
(4) by the product after drying in step (3) in 540 DEG C of roasting 3h, furnace cooling is to get to multi-stage porous ZSM-5 points
Son sieve.
The obtained molecular sieve of embodiment 1, through X-ray diffraction analysis, as shown in Figure 1,2 θ=7.8 ° in figure, 8.8 °,
23.2 °, 23.8 °, 24.3 ° there is apparent MFI characteristic peak, it is known that the material structure being prepared is typical MFI topology knot
Structure；By stereoscan photograph, as shown in Figure 2, it is known that the material being prepared has hierarchical porous structure；Preparation-obtained material
For being catalyzed benzene, methanol alkylation reaction,n(benzene)/n(methanol)=1, the conversion ratio that benzene is measured when reaction temperature is 450 DEG C are
64.5%, the selectivity of toluene is 63.7%, and the selectivity of dimethylbenzene is 38.6%.
Embodiment 2
The preparation method of multi-stage porous ZSM-5 molecular sieve described in the present embodiment, specifically includes the following steps:
(1) raw material are weighed according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰, 0.46 ︰, 0.1 ︰ 0.9 ratio,
Wherein, silicon source is Aladdin chemistry pure silicon diatomaceous earth (wherein the content of silica is 92%), alkali source Na2SiO3·5H2O, mould
Plate agent is 4-propyl ammonium chloride, and mineralizer is ammonium chloride, and the actual amount of silicon is silicon and Na in diatomite2SiO3·5H2In O
The sum of silicon weighs 0.35g Aladdin chemistry pure silicon diatomaceous earth, 0.98gNa respectively2SiO3·5H2O, 0.22g 4-propyl ammonium chloride and
0.48g ammonium chloride is placed in mortar and passes through the grinding of 15min, is allowed to uniformly mixed, obtains paste；
(2) paste that step (1) obtains is moved into 100mL reaction kettle and is sealed, after 150 DEG C of reaction 36h, be cooled to room
Temperature；
(3) product that step (2) obtains sufficiently is dissolved with deionized water, is filtered after washing insoluble matter to neutrality, then
For filter cake in 90 DEG C of heat preservation 3h, product is dry complete；
(4) by the product after drying in step (3) in 550 DEG C of roasting 4h, furnace cooling is to get to multi-stage porous ZSM-5 points
Son sieve.
The obtained molecular sieve of embodiment 2, through X-ray diffraction analysis, as shown in figure 3,2 θ=7.8 ° in figure, 8.8 °,
23.2 °, 23.8 °, 24.3 ° there is apparent MFI characteristic peak, it is known that the material structure being prepared is typical MFI topology knot
Structure.
Embodiment 3
The preparation method of multi-stage porous ZSM-5 molecular sieve described in the present embodiment, specifically includes the following steps:
(1) raw material are weighed according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰, 0.5 ︰, 0.08 ︰ 0.7 ratio,
Wherein, silicon source is the chemical pure silicon diatomaceous earth of good fortune morning chemistry (content of silica is 94%), alkali source Na2SiO3·9H2O, template
Agent is tetrapropyl ammonium hydrogen sulfate, and mineralizer is ammonium chloride, and the actual amount of silicon is silicon and Na in diatomite2SiO3·9H2In O
The sum of silicon weighs the chemical pure silicon diatomaceous earth of 0.32g good fortune morning chemistry, 1.42gNa respectively2SiO3·9H2O, 0.23g tetrapropyl hydrogen sulfate
Ammonium and 0.37g ammonium chloride are placed in mortar and pass through the grinding of 15min, is allowed to uniformly mixed, obtains paste；
(2) paste that step (1) obtains is moved into 100mL reaction kettle and is sealed, after 180 DEG C of reaction 8h, be cooled to room
Temperature；
(3) product that step (2) obtains sufficiently is dissolved with deionized water, is filtered after washing insoluble matter to neutrality, then
For filter cake in 50 DEG C of heat preservation 10h, product is dry complete；
(4) by the product after drying in step (3) in 520 DEG C of roasting 4h, furnace cooling is to get to multi-stage porous ZSM-5 points
Son sieve material.
The obtained material of embodiment 3, through X-ray diffraction analysis, as shown in figure 4,2 θ=7.8 ° in figure, 8.8 °, 23.2 °,
23.8 °, 24.3 ° there is apparent MFI characteristic peak, it is known that the material structure being prepared is typical MFI topological structure；By sweeping
Electromicroscopic photograph is retouched, as shown in Figure 5, it is known that the material being prepared has hierarchical porous structure.
Embodiment 4
The preparation method of multi-stage porous ZSM-5 molecular sieve described in the present embodiment, specifically includes the following steps:
(1) raw material are weighed according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰, 0.4 ︰, 0.08 ︰ 0.76 ratio,
Wherein, silicon source is the chemical pure silicon diatomaceous earth of good fortune morning chemistry (content of silica is 94%), alkali source Na2SiO3·9H2O, template
Agent is tetrapropyl ammonium iodide, and mineralizer is ammonium fluoride, and the actual amount of silicon is silicon and Na in diatomite2SiO3·9H2Silicon in O
The sum of, the chemical pure silicon diatomaceous earth of 0.38g good fortune morning chemistry, 1.14gNa are weighed respectively2SiO3·9H2O, 0.25g tetrapropyl ammonium iodide and
0.28g ammonium fluoride is placed in mortar and passes through the grinding of 10min, is allowed to uniformly mixed, obtains paste；
(2) paste that step (1) obtains is moved into 100mL reaction kettle and is sealed, after 170 DEG C of reaction 12h, be cooled to room
Temperature；
(3) product that step (2) obtains sufficiently is dissolved with deionized water, washing insoluble matter to filtrate is mistake after neutrality
Filter, then for filter cake in 50 DEG C of heat preservation 12h, product is dry complete；
(4) by the product after drying in step (3) in 500 DEG C of roasting 5h, furnace cooling is to get to multi-stage porous ZSM-5 points
Son sieve.
The obtained molecular sieve of embodiment 4, through X-ray diffraction analysis, as shown in fig. 6,2 θ=7.8 ° in figure, 8.8 °,
23.2 °, 23.8 °, 24.3 ° there is apparent MFI characteristic peak, it is known that the material structure being prepared is typical MFI topology knot
Structure.
Embodiment 5
The preparation method of multi-stage porous ZSM-5 molecular sieve described in the present embodiment, specifically includes the following steps:
(1) raw material are weighed according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰, 0.4 ︰, 0.1 ︰ 0.7 ratio,
In, silicon source is that Jilin produces food grade kieselguhr (content of silica is 95%), alkali source Na2SiO3·9H2O, template are
4-propyl bromide, mineralizer are ammonium fluoride, and the actual amount of silicon is silicon and Na in diatomite2SiO3·9H2The sum of silicon in O,
The Jilin 0.38g is weighed respectively produces food grade kieselguhr, 1.13gNa2SiO3·9H2O, 0.27g 4-propyl bromide and 0.26g fluorine
Change ammonium, is placed in mortar and passes through the grinding of 12min, be allowed to uniformly mixed, obtain paste；
(2) paste that step (1) obtains is moved into 100mL reaction kettle and is sealed, after 160 DEG C of reaction 18h, be cooled to room
Temperature；
(3) product that step (2) obtains sufficiently is dissolved with deionized water, is filtered after washing insoluble matter to neutrality, then
For filter cake in 80 DEG C of heat preservation 6h, product is dry complete；
(4) by the product after drying in step (3) in 550 DEG C of roasting 3h, furnace cooling is to get to multi-stage porous ZSM-5 points
Son sieve material.
The obtained material of embodiment 5, through X-ray diffraction analysis, as shown in fig. 7,2 θ=7.8 ° in figure, 8.8 °, 23.2 °,
23.8 °, 24.3 ° there is apparent MFI characteristic peak, it is known that the material structure being prepared is typical MFI topological structure；It is made
Standby obtained material is used to be catalyzed benzene, methanol alkylation reaction,n(benzene)/n(methanol)=1, reaction temperature measure benzene when being 450 DEG C
Conversion ratio be 63.4%, the selectivity of toluene is 64.3%, and the selectivity of dimethylbenzene is 34.7%.
Embodiment 6
The preparation method of multi-stage porous ZSM-5 molecular sieve described in the present embodiment, specifically includes the following steps:
(1) raw material are weighed according to molar ratio Wei Gui ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰, 0.5 ︰, 0.09 ︰ 0.9 ratio,
Wherein, silicon source is that Jilin produces food grade kieselguhr (content of silica is 95%), alkali source Na2SiO3·5H2O, template
For four 4-propyl ammonium chlorides, mineralizer is ammonium fluoride, and the actual amount of silicon is silicon and Na in diatomite2SiO3·5H2Silicon in O
The sum of, the Jilin 0.32g is weighed respectively produces food grade kieselguhr, 1.06gNa2SiO3·5H2O, 0.2g 4-propyl ammonium chloride and
0.33g ammonium fluoride is placed in mortar and passes through the grinding of 10min, is allowed to uniformly mixed, obtains paste；
(2) paste that step (1) obtains is moved into 100mL reaction kettle and is sealed, after 150 DEG C of reaction 20h, be cooled to room
Temperature；
(3) product that step (2) obtains sufficiently is dissolved with deionized water, is filtered after washing insoluble matter to neutrality, then
For filter cake in 100 DEG C of heat preservation 3h, product is dry complete；
(4) by the product after drying in step (3) in 500 DEG C of roasting 6h, furnace cooling is to get to multi-stage porous ZSM-5 points
Son sieve material.
The obtained material of embodiment 6, through X-ray diffraction analysis, as shown in figure 8,2 θ=7.8 ° in figure, 8.8 °, 23.2 °,
23.8 °, 24.3 ° there is apparent MFI characteristic peak, it is known that the material structure being prepared is typical MFI topological structure.
Claims (1)
1. a kind of preparation method of multi-stage porous ZSM-5 molecular sieve, which is characterized in that be prepared from the following steps: (1) according to rubbing
You weigh solid silicon source, alkali than being Gui Yuan ︰ Jian Yuan ︰ Mo Ban Ji ︰ mineralizer=1 ︰ 0.4-0.5 ︰ 0.08-0.1 ︰ 0.7-0.9 respectively
Source, template, mineralizer grind 10-15min after mixing, obtain paste；
(2) paste for obtaining step (1) seals, and after 150-180 DEG C of reaction 8-36h, is cooled to room temperature；
(3) it is filtered after sufficiently washing the product that step (2) obtains to neutrality with deionized water, filter cake is in 50-100 DEG C of dry 3-
12h；
(4) product for obtaining step (3) is in 500-550 DEG C of roasting 3-6h to get multi-stage porous ZSM-5 molecular sieve；
The silicon source is diatomite, and the mass percentage of silica is higher than 90% in diatomite；
The alkali source is the Na2SiO3 containing the crystallization water；
The template is 4-propyl bromide, 4-propyl ammonium chloride, tetrapropyl ammonium iodide or tetrapropyl ammonium hydrogen sulfate；
The mineralizer is ammonium chloride or ammonium fluoride.
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| CN108190913B (en) * | 2018-03-02 | 2020-07-17 | 浙江大学 | Method for synthesizing silicon-rich ZSM-5 zeolite molecular sieve by adopting seed crystal guiding method |
| CN108238614A (en) * | 2018-03-16 | 2018-07-03 | 淮阴工学院 | The method that ZSM-5 zeolite is prepared as raw material slightly soluble agent using clay |
| CN108557840B (en) * | 2018-06-11 | 2021-09-14 | 福州大学 | Synthesis method of Ti-MWW molecular sieve |
| CN111185227B (en) * | 2020-01-16 | 2022-03-11 | 昆明理工大学 | Low-temperature synthesis method of catalyst for catalytic combustion of volatile organic compounds |
| CN115043414B (en) * | 2022-06-09 | 2023-12-29 | 青岛科技大学 | Hierarchical pore molecular sieve and preparation method and application thereof |
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