CN114933315A - High hydrothermal stability UZM-8 molecular sieve and preparation method thereof - Google Patents
High hydrothermal stability UZM-8 molecular sieve and preparation method thereof Download PDFInfo
- Publication number
- CN114933315A CN114933315A CN202210619708.XA CN202210619708A CN114933315A CN 114933315 A CN114933315 A CN 114933315A CN 202210619708 A CN202210619708 A CN 202210619708A CN 114933315 A CN114933315 A CN 114933315A
- Authority
- CN
- China
- Prior art keywords
- molecular sieve
- surface area
- specific surface
- uzm
- hydrothermal stability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C01B39/46—Other types characterised by their X-ray diffraction pattern and their defined composition
- C01B39/48—Other types characterised by their X-ray diffraction pattern and their defined composition using at least one organic template directing agent
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a preparation method of a UZM-8 molecular sieve with high hydrothermal stability, which comprises the following steps: (1) uniformly mixing an aluminum source, alkali, deionized water and a template agent; (2) uniformly mixing a silicon source, deionized water and metal nitrate; (3) adding the mixed solution obtained in the step (2) into the mixed solution obtained in the step (1) under a stirring state; (4) crystallizing the material obtained in the step (3), and washing, drying and roasting the product to obtain the UZM-8 molecular sieve with high hydrothermal stability. The specific surface area of the UZM-8 molecular sieve with high hydrothermal stability prepared by the method is 460-660 m 2 Per g, external specific surface area is 322462m 2 The specific surface area of the micropores is 138-198 m 2 (ii)/g; the specific surface area of the UZM-8 molecular sieve product after hydrothermal aging at 500-580 ℃ can be kept by 85-90%. The molecular sieve prepared by the invention has high structural stability, good regeneration performance and a structure which is beneficial to material mass transfer, and has wide application prospect in the aspect of olefin alkylation reaction.
Description
Technical Field
The invention belongs to the field of inorganic catalytic materials and molecular sieve synthesis, and particularly relates to a high hydrothermal stability UZM-8 molecular sieve and a preparation method thereof.
Background
The MWW topological structure molecular sieve family comprises MCM-22, MCM-49, MCM-56 and the like, wherein the MCM-22 molecular sieve is a novel molecular sieve developed in 20 th 90 th century by Mobil corporation in America, and comprises two sets of mutually independent pore channel systems: one set is a two-dimensional sinusoidal channel (0.4nm multiplied by 0.59nm) which is positioned in the laminated structure and is formed by 10-membered rings; the other set of channel system consists of 12-membered ring supercages (0.71nm x 1.82nm) located between the layered structures. The MCM-22 molecular sieve is a flaky crystal, the surface of the flaky crystal is covered with a high-density semi-super cage structure, and the flaky crystal is an important and special reaction site for a larger molecular reactant. Due to the excellent reactivity of the semi-super-cage structure on the outer surface of the crystal, the molecular sieve with the layered structure is peeled by a layer peeling technology to form a novel material which has a basic structural unit of the layered molecular sieve and abundant reaction space on the surface of the crystal.
The synthesis method of US5,362,697 was first disclosed: the MCM-56 molecular sieve is generated by controlling crystallization conditions. The method has the defects that the crystalline phase of the synthesized product MCM-56 molecular sieve is difficult to control, and the crystal transformation is easy to occur. The patent CN101007637A discloses a technical proposal, which takes MCM-22(p) as a raw material, acid treats the MCM-22(p), and calcinates to obtain the MCM-56 molecular sieve. The method has simple process, no special equipment requirement and easy realization of industrial production. The patent CN106517231A is to solve the problem of Al loss in the MCM-56 molecular sieve prepared by acid treatment. The MCM-22 molecular sieve which is not roasted to remove volatile substances is contacted with inorganic salt solution, so that the problem is solved well. Patent CN111268693A adopts dodecyl trimethyl ammonium bromide, tetradecyl trimethyl ammonium bromide and/or hexadecyl trimethyl ammonium bromide as swelling solvent to carry out swelling dissolving and column supporting on MCM-22(p) to change the MCM-22(p) into a two-dimensional layered structure, the interlayer spacing of the obtained sheet MWW molecular sieve is 2.5-4.7 nm, the external surface area of the sheet MWW molecular sieve is increased, the utilization rate of active sites is improved, and the deactivation of accumulated carbon can be reduced.
The method of patents CN112551539A and CN110615446A adopts a mixed template agent, hexamethylene imine and C with the length of a side chain 1～5 Quaternary ammonium salt halide or hydroxide or dimethyloctadecyl [3- (trimethoxysilyl) propyl group]Ammonium chloride is used as a structure directing agent, and the single-layer MWW molecular sieve is synthesized by a one-step hydrothermal method. CN1997593A and CN107662926A UZM-8 compositions can be prepared using one or more organic eucalyptus salt cations, such as diethyldimethylammonium cations, as structure directing agents. CN103818922A discloses a microwave hydrothermal synthesis method of UZM-8 molecular sieve. By utilizing microwave radiation heating, the problems that the UZM-8 molecular sieve prepared by the patent CN1997593A has long crystallization time, the price of a template agent is high, the product is easy to generate mixed crystals and the like are solved.
In summary, in order to prepare an excellent MWW molecular sieve material with a single-layer structure, researchers adopt post-modification and direct synthesis methods. The molecular sieve with a single-layer structure has the great defect of poor hydrothermal stability, and the performance stability and the catalyst regeneration performance of the molecular sieve are greatly influenced.
Disclosure of Invention
The invention aims to solve the technical problem that the MWW molecular sieve with the single-layer structure prepared by the prior art has poor hydrothermal stability and can not be regenerated. The invention provides a preparation method of a high hydrothermal stability UZM-8 molecular sieve, which is characterized in that the high hydrothermal stability UZM-8 molecular sieve is prepared in one step by introducing a framework metal.
The preparation method of the UZM-8 molecular sieve with high hydrothermal stability comprises the following steps:
(1) dissolving an aluminum source in deionized water, adding an alkali source and a template agent, and uniformly mixing to form a material A;
(2) dissolving metal nitrate in deionized water, adding a silicon source, and uniformly mixing to form a material B;
(3) slowly dripping the material B into the material A under the stirring state, and uniformly mixing to obtain a final material;
(4) crystallizing the final material obtained in the step (3), and washing, drying and roasting the product to obtain the UZM-8 molecular sieve with high hydrothermal stability;
wherein, the aluminum source, the silicon source, the alkali source, the water and the template agent in the final material in the step (3) are calculated according to the following substances in proportion:
SiO 2 /Al 2 O 3 the molar ratio is 25-60;
templating agent/SiO 2 The molar ratio is 0.2-0.5;
OH - /SiO 2 the molar ratio is 0.1-0.2;
H 2 O/SiO 2 the molar ratio is 20-45;
the specific surface area of the UZM-8 molecular sieve with high hydrothermal stability obtained by the method is 460-660 m 2 Per g, the external specific surface area is 322-462 m 2 The specific surface area of the micropores is 138-198 m 2 (ii)/g; after hydrothermal aging at 500-580 ℃, the specific surface area of the UZM-8 molecular sieve is kept at 85-90%.
In the invention, the aluminum source in the step (1) is sodium metaaluminate; the alkali source is sodium hydroxide; the template agent is one or more of piperidine, cyclohexylamine and dimethyl diethyl ammonium hydroxide.
The silicon source in the step (2) is one or more of silica sol, white carbon black and silica gel; the metal nitrate is cerium nitrate, lanthanum nitrate, samarium nitrate or zirconium nitrate.
In the metal nitrate in the step (2), the metal oxide accounts for 1.5-3% of the total mass of the silicon dioxide.
Preferably, the crystallization temperature in the step (4) is 140-200 ℃; the crystallization time is 25-120 hours; the drying temperature is 80-120 ℃, and the drying time is 10-20 hours; the roasting temperature is 530-580 ℃, and the roasting time is 4-6 hours.
Preferably, the crystallization temperature in the step (4) is 150-180 ℃; the crystallization time is 30-100 hours; the drying temperature is 80-120 ℃, and the drying time is 10-20 hours; the roasting temperature is 530-580 ℃, and the roasting time is 4-6 hours.
The invention also provides a UZM-8 molecular sieve with high hydrothermal stability, and the specific surface area of the molecular sieve is 460-660 m 2 A ratio of 500 to 640 m/g is preferred 2 The external specific surface area is 322-462 m 2 A ratio of 350 to 446 m/g is preferred 2 The specific surface area of the micropores is 138-198 m 2 Preferably 150 to 194 m/g 2 (ii) in terms of/g. The specific surface area of the UZM-8 molecular sieve product after hydrothermal aging at 500-580 ℃ can be kept by 85-90%. The specific surface area of the UZM-8 molecular sieve product after hydrothermal aging at 500-580 ℃ is 391-594 m 2 Per g, preferably 425 to 576m 2 The external specific surface area is 273.7-415.8 m 2 (iv)/g, preferably 297.5 to 401.4m 2 The specific surface area of the micropores is 117.3-178.2 m 2 The preferred concentration is 127.5-174.6 m 2 /g。
According to the invention, a small amount of metal nitrate is added into a conventional hydrothermal synthesis UZM-8 molecular sieve system, so that the effect of improving the hydrothermal stability of the UZM-8 molecular sieve is achieved, and the method has a remarkable effect on the regeneration and utilization of a molecular sieve catalyst. The template agent adopted by the invention is nontoxic, cheap and easy to obtain, has little pollution to the environment, the obtained product has strong controllability, the single-layer structure is favorable for material mass transfer, further aftertreatment modification is not needed, the loss of the active site of the molecular sieve aluminum in the aftertreatment process is avoided, and the product prepared by the invention has unique application prospect in the aspects of olefin alkylation reaction and the like.
Drawings
FIG. 1 is an X-ray diffraction pattern of the Ce/UZM-8 molecular sieve synthesized in example 1;
FIG. 2 is an X-ray diffraction pattern of the Zr/UZM-8 molecular sieve synthesized in example 2;
FIG. 3 is a scanning electron microscope image of the Ce/UZM-8 molecular sieve synthesized in example 1;
FIG. 4 is a scanning electron microscope image of the Zr/UZM-8 molecular sieve synthesized in example 2.
Detailed Description
The process of the present invention is illustrated in detail by the following examples, which are not intended to limit the invention thereto. The crystal form of the UZM-8 molecular sieve with high hydrothermal stability is characterized by X-ray diffraction, the appearance is observed by a scanning electron microscope, and the specific surface area is analyzed by a specific surface area and aperture analyzer.
Example l
Dissolving sodium metaaluminate into deionized water under the condition of stirring, and then sequentially adding sodium hydroxide and piperidine to form a material A; dissolving cerium nitrate into deionized water, and then adding silica sol to form a material B; above-mentioned material B slowly drips to material A, and the misce bene obtains final material, and final material ratio satisfies: al (aluminum) 2 O 3 /SiO 2 ＝37,OH - /SiO 2 0.20, piperidine/SiO 2 ＝0.36,H 2 O/SiO 2 The cerium oxide in the cerium nitrate accounts for 2% of the mass of the silica. The final material is put into a reaction kettle and crystallized for 60 hours at 165 ℃. Washing the obtained product to be neutral by deionized water, drying the product for 12 hours at 120 ℃, and then roasting the product for 5 hours at 550 ℃ to obtain the Ce/UZM-8 molecular sieve. The MWW molecular sieve is proved to be an MWW molecular sieve through XRD detection, and has a bent layered structure through scanning electron microscope observation. The specific surface area of the product was 598.2m 2 Per g, external specific surface area 418.74m 2 Specific surface area of micropores 179.46m 2 (ii) in terms of/g. The Ce/UZM-8 molecular sieve prepared in example 1 has a specific surface area of 514.45m after hydrothermal aging under the condition of 535 ℃ steam 2 Per g, external specific surface area 360.12m 2 G, specific micropore surface area 154.34m 2 /g。
Example 2
Dissolving sodium metaaluminate into deionized water under the condition of stirring, and then sequentially adding sodium hydroxide and cyclohexylamine to form a material A; dissolving cerium nitrate into deionized water, and then adding silica sol to form a material B; the material B is slowly dripped into the material A, the mixture is uniform to obtain a final material, and the final material ratio satisfies: al (Al) 2 O 3 /SiO 2 ＝25,OH - /SiO 2 0.2, cyclohexylamine/SiO 2 ＝0.2,H 2 O/SiO 2 Zirconium nitrate contains 3% by mass of zirconia based on the mass of silica 35. The materials are put into a reaction kettleCrystallizing at 170 deg.C for 52 hr. Washing the obtained product to be neutral by deionized water, drying the product for 12 hours at 100 ℃, and then roasting the product for 4 hours at 580 ℃ to obtain the Zr/UZM-8 molecular sieve. The MWW molecular sieve is proved to be MWW molecular sieve by XRD detection, and has a bent layered structure by observation of a scanning electron microscope. The specific surface area of the product is 501.3m 2 Per g, external specific surface area 351.1m 2 Per g, specific micropore surface area of 150.2m 2 (ii) in terms of/g. The Zr/UZM-8 molecular sieve prepared in example 2 has a specific surface area of 446.16m after hydrothermal aging under the steam condition of 500 DEG C 2 Per gram, external specific surface area 312.48m 2 Specific surface area of micropores 133.68m 2 /g。
Example 3
Dissolving sodium metaaluminate into deionized water under the condition of stirring, and then sequentially adding sodium hydroxide and dimethyl diethyl ammonium hydroxide to form a material A; dissolving lanthanum nitrate into deionized water, and then adding silica sol to form a material B; above-mentioned material B slowly drips to material A, and the misce bene obtains final material, and final material ratio satisfies: al (Al) 2 O 3 /SiO 2 ＝32,OH - /SiO 2 0.16, dimethyldiethylammonium hydroxide/SiO 2 ＝0.3,H 2 O/SiO 2 30, the mass of lanthanum oxide in lanthanum nitrate accounts for 2 percent of the mass of silicon dioxide. The materials are put into a reaction kettle and crystallized for 60 hours at 165 ℃. Washing the obtained product to neutrality by deionized water, drying for 16 hours at 100 ℃, and then roasting for 5 hours at 560 ℃ to obtain the Zr/UZM-8 molecular sieve. The MWW molecular sieve is proved to be an MWW molecular sieve through XRD detection, and has a bent layered structure through scanning electron microscope observation. The specific surface area of the product was 550.2m 2 Per g, external specific surface area 385.14m 2 Specific surface area of micropores 165.06m 2 (ii) in terms of/g. The Zr/UZM-8 molecular sieve prepared in example 3 has a specific surface area of 467.67m after hydrothermal aging under the condition of water vapor at 518 DEG C 2 Per g, external specific surface area 327.37m 2 G, specific surface area of micropores 140.3m 2 /g。
Example 4
Dissolving sodium metaaluminate into deionized water under the condition of stirring, and then sequentially adding sodium hydroxide and piperidine to form a material A; dissolving samarium nitrateDissolving the mixture into deionized water, and adding silica sol to form a material B; the material B is slowly dripped into the material A, the mixture is uniform to obtain a final material, and the final material ratio satisfies: al (Al) 2 O 3 /SiO 2 ＝48,OH - /SiO 2 0.18, piperidine/SiO 2 ＝0.45,H 2 O/SiO 2 26, the mass of samarium oxide in the samarium nitrate accounts for 2.1 percent of the mass of silicon dioxide. The materials are put into a reaction kettle and crystallized for 96 hours at 150 ℃. Washing the obtained product to neutrality by deionized water, drying the product for 15 hours at 110 ℃, and then roasting the product for 6 hours at 530 ℃ to obtain the Ce/UZM-8 molecular sieve. The MWW molecular sieve is proved to be an MWW molecular sieve through XRD detection, and has a bent layered structure through scanning electron microscope observation. The specific surface area of the product is 576.6m 2 Per g, external specific surface area 403.62m 2 Specific surface area of micropores 172.98m 2 (ii) in terms of/g. The Ce/UZM-8 molecular sieve prepared in example 4 has a specific surface area of 501.64m after hydrothermal aging under the steam condition at 540 DEG C 2 Per g, external specific surface area 351.15m 2 Specific surface area of micropores 150.49m 2 /g。
Example 5
Dissolving sodium metaaluminate into deionized water under the condition of stirring, and then sequentially adding sodium hydroxide and dimethyl diethyl ammonium hydroxide to form a material A; dissolving cerium nitrate into deionized water, and then adding silica sol to form a material B; above-mentioned material B slowly drips to material A, and the misce bene obtains final material, and final material ratio satisfies: al (aluminum) 2 O 3 /SiO 2 ＝56,OH - /SiO 2 0.14, dimethyldiethylammonium hydroxide/SiO 2 ＝0.33,H 2 O/SiO 2 The mass of cerium oxide in cerium nitrate accounted for 1.5% of the mass of silicon dioxide. The materials are put into a reaction kettle and crystallized for 45 hours at 175 ℃. Washing the obtained product to be neutral by deionized water, drying the product for 10 hours at 120 ℃, and then roasting the product for 4 hours at 570 ℃ to obtain the Ce/UZM-8 molecular sieve. The MWW molecular sieve is proved to be MWW molecular sieve by XRD detection, and has a bent layered structure by observation of a scanning electron microscope. The specific surface area of the product is 640m 2 (g) an external specific surface area of 446m 2 G, micropore specific surface area 194m 2 (ii) in terms of/g. Steam bar at 560 ℃The specific surface area of the Ce/UZM-8 molecular sieve prepared in example 5 after hydrothermal aging is 576m 2 Per gram, external specific surface area 401.4m 2 Specific surface area of micropores 174.6 m/g 2 /g。
Example 6
Dissolving sodium metaaluminate into deionized water under the condition of stirring, and then sequentially adding sodium hydroxide and cyclohexylamine to form a material A; dissolving cerium nitrate into deionized water, and then adding silica sol to form a material B; the material B is slowly dripped into the material A, the mixture is uniform to obtain a final material, and the final material ratio satisfies: al (Al) 2 O 3 /SiO 2 ＝60,OH - /SiO 2 0.2, cyclohexylamine/SiO 2 ＝0.25,H 2 O/SiO 2 23, the mass of zirconia in the zirconium nitrate accounts for 1.8% of the mass of silica. The materials are put into a reaction kettle and crystallized for 30 hours at 180 ℃. Washing the obtained product to be neutral by deionized water, drying the product for 17 hours at 115 ℃, and then roasting the product for 6 hours at 540 ℃ to obtain the Zr/UZM-8 molecular sieve. The MWW molecular sieve is proved to be MWW molecular sieve by XRD detection, and has a bent layered structure by observation of a scanning electron microscope. The specific surface area of the product is 619.2m 2 Per g, external specific surface area 433.44m 2 Specific surface area of micropores 185.76m 2 (ii) in terms of/g. The Ce/UZM-8 molecular sieve prepared in example 6 has a specific surface area of 544.9m after hydrothermal aging under the steam condition of 580 DEG C 2 Per g, external specific surface area 381.43m 2 (per gram), specific micropore surface area 163.47m 2 /g。
Claims (9)
1. A preparation method of a UZM-8 molecular sieve with high hydrothermal stability is characterized by comprising the following steps:
(1) dissolving an aluminum source in deionized water, adding an alkali source and a template agent, and uniformly mixing to form a material A;
(2) dissolving metal nitrate in deionized water, adding a silicon source, and uniformly mixing to form a material B;
(3) slowly dripping the material B into the material A under the stirring state, and uniformly mixing to obtain a final material;
(4) crystallizing the final material obtained in the step (3), and washing, drying and roasting the product to obtain the UZM-8 molecular sieve with high hydrothermal stability;
wherein, the metal nitrate in the step (2) is cerium nitrate, lanthanum nitrate, samarium nitrate or zirconium nitrate; and (3) calculating an aluminum source, a silicon source, an alkali source, water and a template agent in the final material according to the following substances in proportion:
SiO 2 /Al 2 O 3 the molar ratio is 25-60;
templating agent/SiO 2 The molar ratio is 0.2-0.5;
OH - /SiO 2 the molar ratio is 0.1-0.2;
H 2 O/SiO 2 the molar ratio is 20-45;
the hydrothermal stability UZM-8 molecular sieve obtained by the method has the specific surface area of 460-660 m 2 Per g, the external specific surface area is 322-462 m 2 The specific surface area of the micropores is 138-198 m 2 (ii)/g; after hydrothermal aging at 500-580 ℃, the specific surface area of the UZM-8 molecular sieve can be kept at 85-90%.
2. The method of claim 1, wherein: the aluminum source in the step (1) is sodium metaaluminate; the alkali source is sodium hydroxide; the template agent is one or more of piperidine, cyclohexylamine and dimethyl diethyl ammonium hydroxide.
3. The method of claim 1, wherein: the silicon source in the step (2) is one or more of silica sol, white carbon black and silica gel.
4. The method of claim 1, wherein: the metal oxide in the metal nitrate in the step (2) accounts for 1.5-3% of the total mass of the silicon dioxide.
5. The method of claim 1, wherein: the crystallization temperature in the step (4) is 140-200 ℃; the crystallization time is 25-120 hours; the drying temperature is 80-120 ℃, and the drying time is 10-20 hours; the roasting temperature is 530-580 ℃, and the roasting time is 4-6 hours.
6. The method of claim 5, wherein: the crystallization temperature in the step (4) is 150-180 ℃; the crystallization time is 30-100 hours; the drying temperature is 80-120 ℃, and the drying time is 10-20 hours; the roasting temperature is 530-580 ℃, and the roasting time is 4-6 hours.
7. A UZM-8 molecular sieve with high hydrothermal stability, which is prepared by the preparation method of any one of claims 1 to 6.
8. The high hydrothermal stability UZM-8 molecular sieve of claim 7, wherein the high hydrothermal stability UZM-8 molecular sieve has a specific surface area of 500 to 640m 2 Per g, the external specific surface area is 350 to 446m 2 Per g, the specific surface area of the micropores is 150-194 m 2 (iv) g; after hydrothermal aging of the UZM-8 molecular sieve at 500-580 ℃, the specific surface area is 391-594 m 2 Per gram, the external specific surface area is 273.7-415.8 m 2 The specific surface area of the micropores is 117.3-178.2 m 2 /g。
9. The high hydrothermal stability of claim 7, wherein the UZM-8 molecular sieve has a specific surface area of 425-576 m after hydrothermal aging at 500-580 ℃ 2 (iv) a specific external surface area of 297.5 to 401.4m 2 The specific surface area of the micropores is 127.5 to 174.6m 2 /g。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619708.XA CN114933315A (en) | 2022-06-06 | 2022-06-06 | High hydrothermal stability UZM-8 molecular sieve and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619708.XA CN114933315A (en) | 2022-06-06 | 2022-06-06 | High hydrothermal stability UZM-8 molecular sieve and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114933315A true CN114933315A (en) | 2022-08-23 |
Family
ID=82867476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210619708.XA Pending CN114933315A (en) | 2022-06-06 | 2022-06-06 | High hydrothermal stability UZM-8 molecular sieve and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114933315A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101213158A (en) * | 2005-06-29 | 2008-07-02 | 环球油品公司 | Alkylation process using UZM-8 zeolite |
| US20110077442A1 (en) * | 2009-09-30 | 2011-03-31 | Uop Llc | Aromatic Alkylation Catalyst |
| CN102009985A (en) * | 2010-12-21 | 2011-04-13 | 南京工业大学 | MCM-22 zeolite molecular sieve containing rare earth heteroatoms in skeleton and preparation method thereof |
| CN104445255A (en) * | 2014-12-04 | 2015-03-25 | 南京工业大学 | Preparation method of heteroatom MCM-49 zeolite molecular sieve |
| US20170043327A1 (en) * | 2014-01-27 | 2017-02-16 | Exxonmobil Chemical Patents Inc. | Synthesis of Molecular Sieves Having MWW Framework Structure |
| CN107512727A (en) * | 2016-06-18 | 2017-12-26 | 中国石油化工股份有限公司 | The preparation method of binder free MWW structure molecular screens |
| CN107511175A (en) * | 2016-06-18 | 2017-12-26 | 中国石油化工股份有限公司 | MWW structural molecules sieve catalyst, preparation method and application |
| CN107662926A (en) * | 2016-07-27 | 2018-02-06 | 中国石油化工股份有限公司 | A kind of molecular sieves of UZM 8 and its synthetic method |
| CN107792864A (en) * | 2017-10-30 | 2018-03-13 | 中海油天津化工研究设计院有限公司 | A kind of preparation method of the molecular sieves of size tunable P ZSM 5 |
-
2022
- 2022-06-06 CN CN202210619708.XA patent/CN114933315A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101213158A (en) * | 2005-06-29 | 2008-07-02 | 环球油品公司 | Alkylation process using UZM-8 zeolite |
| US20110077442A1 (en) * | 2009-09-30 | 2011-03-31 | Uop Llc | Aromatic Alkylation Catalyst |
| CN102009985A (en) * | 2010-12-21 | 2011-04-13 | 南京工业大学 | MCM-22 zeolite molecular sieve containing rare earth heteroatoms in skeleton and preparation method thereof |
| US20170043327A1 (en) * | 2014-01-27 | 2017-02-16 | Exxonmobil Chemical Patents Inc. | Synthesis of Molecular Sieves Having MWW Framework Structure |
| CN104445255A (en) * | 2014-12-04 | 2015-03-25 | 南京工业大学 | Preparation method of heteroatom MCM-49 zeolite molecular sieve |
| CN107512727A (en) * | 2016-06-18 | 2017-12-26 | 中国石油化工股份有限公司 | The preparation method of binder free MWW structure molecular screens |
| CN107511175A (en) * | 2016-06-18 | 2017-12-26 | 中国石油化工股份有限公司 | MWW structural molecules sieve catalyst, preparation method and application |
| CN107662926A (en) * | 2016-07-27 | 2018-02-06 | 中国石油化工股份有限公司 | A kind of molecular sieves of UZM 8 and its synthetic method |
| CN107792864A (en) * | 2017-10-30 | 2018-03-13 | 中海油天津化工研究设计院有限公司 | A kind of preparation method of the molecular sieves of size tunable P ZSM 5 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5360774A (en) | Method for recharging a spend fluid catalytic cracking process catalyst | |
| TWI434806B (en) | Synthesis of Small Grain Total Silicon Beta Zeolite | |
| CN101643219B (en) | Preparation method of nano-ZSM-5 molecular sieve | |
| CN111569935B (en) | Catalyst for preparing paraxylene and preparation method and application thereof | |
| KR20060092284A (en) | Mww type zeolite substance, and precursor substance therefor | |
| CN104556094B (en) | A kind of Y/Silicalite-1 composite molecular screen and preparation method thereof | |
| CN111333082B (en) | All-silicon H-Beta molecular sieve and preparation method and application thereof | |
| FR2638444A1 (en) | PROCESS FOR THE SYNTHESIS OF ZEOLITHS BELONGING TO THE STRUCTURAL FAMILY OF FAUJASITE, PRODUCTS OBTAINED AND THEIR APPLICATION IN ADSORPTION AND CATALYSIS | |
| CN112678842B (en) | Synthesis method of nano Sn-Beta molecular sieve | |
| CN113694961B (en) | Nano hierarchical pore BETA structure molecular sieve catalyst, and preparation method and application thereof | |
| CN101311117B (en) | Nano composite meso-microporous molecular sieve and preparation method thereof | |
| US20230132229A1 (en) | Composite zsm-5 molecular sieve, preparation method therefor, catalyst and use thereof | |
| CN115321555B (en) | Method for synthesizing high-silicon AFX zeolite molecular sieve by using small molecular organic template agent | |
| CN105408254A (en) | Zeolite SSZ-70 having enhanced external surface area | |
| CN107777697B (en) | Y-type molecular sieve and preparation method thereof | |
| CN102198950A (en) | Method for preparing NaY molecular sieve with high aluminum-silicon ratio | |
| CN114933315A (en) | High hydrothermal stability UZM-8 molecular sieve and preparation method thereof | |
| CN101003001A (en) | Method for preparing aluminium carrier supported molecular-sieve film catalytic rectification packing | |
| CN114212800B (en) | Novel high-silicon Y-type zeolite and preparation method and application thereof | |
| CN115490243B (en) | Short b-axis HZSM-5 zeolite molecular sieve and preparation method and application thereof | |
| CN113694960B (en) | ZrCu-MOR zeolite for synthesizing 5-ethoxymethyl furfural and preparation method thereof | |
| CN116425171A (en) | Preparation method of high-performance hydroisomerization catalyst mesoporous and microporous step structure ZSM 48 molecular sieve | |
| CN1151067C (en) | process for preparing cubic mesoporous Si-Al molecular sieve with strong acidic site | |
| CN106946266B (en) | A kind of SAPO-34/ZSM-12 composite molecular screens and its synthetic method | |
| CN112707409A (en) | Green preparation method of nano all-silicon Beta molecular sieve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |