CN115920952A - Y-shaped molecular sieve/macroporous alumina hybrid composite material and synthetic method thereof - Google Patents
Y-shaped molecular sieve/macroporous alumina hybrid composite material and synthetic method thereof Download PDFInfo
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Abstract
The invention provides a Y-shaped molecular sieve/macroporous alumina hybrid composite material and a synthetic method thereof, wherein the synthetic method comprises the following steps: (1) Mixing and stirring sodium silicate, sodium metaaluminate and deionized water, then standing, aging and cooling to obtain a Y-type molecular sieve precursor solution; (2) Respectively mixing and stirring aluminum salt and sodium metaaluminate with deionized water until the aluminum salt and the sodium metaaluminate are completely dissolved to respectively prepare an acidic aluminum source solution and an alkaline aluminum source solution; (3) Respectively and slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution in a parallel-flow adding mode under continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 7-10 by using an ammonia water solution, and standing and aging; (4) And (3) adjusting the pH value of the slurry system obtained in the step (3) to 11 to 14 by using a dilute sodium hydroxide solution, standing for crystallization, filtering, washing, drying and performing ammonium exchange to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material.
Description
Technical Field
The invention relates to a Y-type molecular sieve/macroporous alumina hybrid composite material and a synthesis method thereof, belonging to the technical field of catalytic material synthesis.
Technical Field
Currently, fluid Catalytic Cracking (FCC) is still the major refining process in China, especially for secondary processing of heavy feedstocks, and the performance of FCC catalyst is a critical influence factor, which has a decisive influence on the overall reaction performance of the FCC unit. At present, most of catalysts used by FCC devices of various domestic large refineries are semi-synthetic FCC catalysts which mainly comprise three components of a Y-type zeolite molecular sieve, a binder and a matrix, wherein the Y-type zeolite molecular sieve is a core active component. However, since the pore structure of the main body of the conventional Y-type zeolite molecular sieve is a microporous structure (< 2 nm), the diffusion mass transfer process of heavy oil macromolecules in the structure thereof is seriously influenced, so that the catalytic cracking reaction process of the heavy oil macromolecules on the surface thereof is greatly limited, which also makes the conventional Y-type zeolite molecular sieve difficult to meet the requirements of the current heavy oil catalytic cracking process.
In order to solve the problems, the prior art method mainly introduces a 'secondary medium-large pore' structural unit into the structure of the Y-type zeolite molecular sieve to modulate the pore structure property of the Y-type zeolite molecular sieve, thereby improving the diffusion mass transfer performance of the Y-type zeolite molecular sieve to heavy oil macromolecules. In particular, such technical processes are currently based mainly on two approaches, namely "in situ synthesis" and "post-synthesis modification". Wherein, the in-situ synthesis is that a 'middle and large pore structure unit' is constructed in a Y-shaped molecular sieve structure in situ in the synthesis process of the Y-shaped molecular sieve by adopting a special synthesis method; the modification after synthesis is to modify the Y-type zeolite molecular sieve after synthesis, for example, by post-modification methods such as high-temperature hydrothermal treatment, acid/alkali extraction and the like, so as to introduce the 'medium-and large-pore structure units' into the structure of the Y-type zeolite molecular sieve.
The two methods have advantages and disadvantages, wherein the product obtained by the in-situ synthesis method has better physical and chemical properties, but the synthesis process is usually more complicated, and the existing methods mostly use special and expensive organic template agents; the post-synthesis modification method is relatively simple in process, but the post-synthesis modification process inevitably destroys the structure of the Y-type molecular sieve to a certain extent, so that the physical and chemical properties of the product are relatively poor. For the above reasons, the practical application of the prior art method is greatly limited, and the design and development of a novel high-performance heavy oil catalytic cracking FCC catalyst are greatly hindered.
Disclosure of Invention
Aiming at the current situation that the current Y-type zeolite molecular sieve pore structure property is difficult to meet the requirement of heavy oil catalytic cracking process on the mass transfer diffusion performance of the molecular sieve and the defects and shortcomings of the existing pore structure property modulation technical method, the invention aims to provide a Y-type molecular sieve/macroporous alumina hybrid composite material and a synthesis method thereof. Compared with the conventional Y-type molecular sieve, the Y-type molecular sieve/macroporous alumina hybrid composite material has an excellent pore structure (especially a mesoporous structure), and can well meet the requirements of a heavy oil catalytic cracking process. Meanwhile, compared with the prior art, the Y-type molecular sieve/macroporous alumina hybrid composite material has the remarkable advantages of simple preparation process and low raw material cost, and has good application prospect.
The invention relates to a method for synthesizing a Y-shaped molecular sieve/macroporous alumina hybrid composite material, which comprises the following steps:
(1) Mixing and stirring sodium silicate, sodium metaaluminate and deionized water for 0.5-3 hours at room temperature, standing and aging for 4-24 hours at the water bath temperature of 30-55 ℃, and cooling to room temperature to obtain a precursor solution of the Y-type molecular sieve;
(2) Respectively mixing and stirring aluminum salt and sodium metaaluminate with deionized water at room temperature until the aluminum salt and the sodium metaaluminate are completely dissolved to respectively prepare an acidic aluminum source solution and an alkaline aluminum source solution;
(3) Respectively and slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution by adopting a parallel-flow adding mode at the water bath temperature of 50-95 ℃ under the condition of continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 7-10 by using an ammonia water solution, and then standing and aging for 0.5-5 hours;
(4) And (4) regulating the pH value of the slurry system obtained in the step (3) to 11-14 by using a sodium hydroxide dilute solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing the slurry system for 12-48 hours at the temperature of 80-150 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material.
The invention provides a synthesis method, wherein sodium silicate, sodium metaaluminate and sodium metaaluminate are removed in step (1)The mass ratio of the ionized water is sodium silicate (according to SiO) 2 Counting): sodium metaaluminate (as Al) 2 O 3 Counting): deionized water =2 to 20:1:20 to 200, preferably 5 to 15:1:50 to 150.
According to the synthesis method provided by the invention, in the step (2), the aluminum salt can be one or more of aluminum chloride, aluminum nitrate, aluminum sulfate and aluminum hydroxychloride, and preferably aluminum sulfate.
The synthesis method provided by the invention is characterized in that the mass ratio of the aluminum salt to the deionized water in the step (2) is aluminum salt (based on Al) 2 O 3 Meter): deionized water =1:3 to 30, preferably 5 to 10.
The synthesis method provided by the invention is characterized in that the mass ratio of the sodium metaaluminate to the deionized water in the step (2) is the sodium metaaluminate (according to Al) 2 O 3 Meter): deionized water =1:2 to 20, preferably 4 to 10.
The synthesis method provided by the present invention, wherein the filtration, washing, drying and ammonium exchange in step (3) are all methods commonly used in the art, and the present invention is not particularly limited.
The Y-type molecular sieve/macroporous alumina hybrid composite material is obtained by any one of the synthesis methods.
The invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material based on the eutectic hybridization principle. The Y-type molecular sieve and the macroporous alumina in the material structure are in a hybrid symbiotic state, so that a composite crystalline phase structure of 'you in me, you in me' is formed, and the material can simultaneously combine the high cracking activity of the Y-type molecular sieve and the advantages of the macroporous volume and the large specific surface pore structure performance of the macroporous alumina material. Therefore, the material can well overcome the defect of insufficient mass transfer diffusion performance of heavy oil macromolecules of the conventional Y-shaped molecular sieve, greatly improve the heavy oil conversion capability of the conventional Y-shaped molecular sieve and obviously reduce the coke yield of the conventional Y-shaped molecular sieve. In addition, compared with the prior art, the method disclosed by the invention not only has excellent physical and chemical properties of the product, but also has the remarkable advantages of low cost and simple process, so that the method has a good practical application prospect.
Drawings
FIG. 1 is an XRD (X-ray diffraction) spectrum of a C3 sample of a Y-type molecular sieve/macroporous alumina hybrid composite material synthesized by the method. As can be seen from the figure, the C3 sample simultaneously shows the characteristic X-ray diffraction peaks of the Y-type molecular sieve and the macroporous alumina, and the sample simultaneously contains the Y-type molecular sieve and the macroporous alumina.
Detailed Description
The following examples illustrate the invention in detail: the present example is carried out on the premise of the technical scheme of the present invention, and detailed embodiments and processes are given, but the scope of the present invention is not limited to the following examples, and the experimental methods without specific conditions noted in the following examples are generally performed according to conventional conditions.
Raw material source and specification
Y-type molecular sieve (hydrogen type), alumina sol and kaolin, shanxi Teng Mao science and technology Co., ltd., qualified product; aluminum sulfate (Al) 2 (SO 4 ) 3 ·18H 2 O), sodium metaaluminate (NaAlO), sodium silicate (Na) 2 SiO 3 ·9H 2 O), sodium hydroxide (NaOH) and ammonia (25%), group of chinese drugs, analytical pure reagent.
Sample characterization and evaluation
The crystallinity of the sample was analyzed on an X-ray diffractometer model D/max-2200PC manufactured by Rigaku corporation, japan. The working voltage of the X-ray diffractometer is 40kV, the current is 20mA, the radiation is CuK alpha, the phase scanning angle is 5-50 degrees, and the scanning speed is 10 (°)/min; the scanning angle of the crystallinity is 22.5 to 25.0 degrees, and the scanning speed is 1 (°)/min;
determination of specific surface and pore volume parameters of the samples A model N ASAP3000, manufactured by Micromeritics, USA 2 The adsorption-desorption is carried out on an adsorption-desorption instrument. The loading of the molecular sieve is about 0.0600g, the molecular sieve is pretreated for 8 hours by vacuum-pumping and degassing at 300 ℃ to remove water and residual impurities in the molecular sieve, and then the adsorption-desorption operation is carried out at the liquid nitrogen temperature. Measuring the specific surface area and the pore volume of the molecular sieve sample by adopting methods such as BET, t-plot and the like;
the catalytic cracking reaction performance of the heavy oil of the FCC catalyst sample is carried out on an advanced catalytic cracking evaluation device (ACE), the reaction temperature is 530 ℃, the catalyst-to-oil ratio is 5, the aging condition of the catalyst is 800 ℃, 17 hours and 100 percent of water vapor, and the properties of the raw oil are shown in Table 1.
TABLE 1 Properties of the stock oils
Example 1
The method of the invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material
(1) At room temperature, 1185 g of sodium silicate, 80.4 g of sodium metaaluminate and 7500 g of deionized water are mixed and stirred for 0.5 hour, then the mixture is kept stand and aged for 24 hours at the water bath temperature of 30 ℃, and the precursor solution of the Y-type molecular sieve is obtained after the mixture is cooled to room temperature.
(2) At room temperature, 326.8 g of aluminum sulfate and 250 g of deionized water are mixed and stirred until the aluminum sulfate is dissolved, and an acidic aluminum source solution is prepared; 80.4 g of sodium metaaluminate and 255 g of deionized water are mixed and stirred until the sodium metaaluminate is completely dissolved, so as to prepare the alkaline aluminum source solution.
(3) And (2) respectively and slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution by adopting a cocurrent flow adding mode at the water bath temperature of 95 ℃ under the condition of continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 7 by using an ammonia water solution, and standing and aging for 0.5 hour.
(4) And (3) adjusting the pH value of the slurry system obtained in the step (3) to 11 by using a sodium hydroxide dilute solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing the slurry system for 12 hours at the temperature of 150 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material C1.
Example 2
The method of the invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material
(1) Mixing 1991 g of sodium silicate, 96.5 g of sodium metaaluminate and 7800 g of deionized water at room temperature, stirring for 1 hour, standing and aging at the water bath temperature of 35 ℃ for 20 hours, and cooling to room temperature to obtain a precursor solution of the Y-type molecular sieve.
(2) Mixing and stirring 392.2 g of aluminum sulfate and 360 g of deionized water at room temperature until the aluminum sulfate is dissolved to prepare an acidic aluminum source solution; 96.5 g of sodium metaaluminate and 330 g of deionized water are mixed and stirred until the sodium metaaluminate is completely dissolved, so as to prepare the alkaline aluminum source solution.
(3) And (2) slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution respectively in a parallel flow adding mode at the water bath temperature of 90 ℃ under continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 7.5 by using an ammonia water solution, and standing and aging for 1 hour.
(4) And (3) adjusting the pH value of the slurry system obtained in the step (3) to 12 by using a sodium hydroxide dilute solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing the slurry system for 18 hours at the temperature of 130 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material C2.
Example 3
The method of the invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material
(1) Mixing and stirring 2986 g of sodium silicate, 112.5 g of sodium metaaluminate and 7800 g of deionized water for 1.5 hours at room temperature, standing and aging at the water bath temperature of 40 ℃ for 16 hours, and cooling to room temperature to obtain a precursor solution of the Y-type molecular sieve.
(2) Mixing 457.5 g of aluminum sulfate and 490 g of deionized water at room temperature, stirring until the aluminum sulfate is dissolved, and preparing an acidic aluminum source solution; 112.5 g of sodium metaaluminate and 455 g of deionized water are mixed and stirred until the sodium metaaluminate is completely dissolved, so as to prepare the alkaline aluminum source solution.
(3) And (2) slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution respectively in a parallel flow adding mode at the water bath temperature of 80 ℃ under continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 8 by using an ammonia water solution, and standing and aging for 2 hours.
(4) And (4) regulating the pH value of the slurry system obtained in the step (3) to 12.5 by using a dilute sodium hydroxide solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing for 24 hours at the temperature of 110 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material C3.
Example 4
The method of the invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material
(1) Mixing and stirring 4170 g of sodium silicate, 128.6 g of sodium metaaluminate and 7200 g of deionized water for 2.0 hours at room temperature, standing and aging at the water bath temperature of 45 ℃ for 12 hours, and cooling to room temperature to obtain a precursor solution of the Y-type molecular sieve.
(2) Mixing 522.9 g of aluminum sulfate and 640 g of deionized water at room temperature, stirring until the aluminum sulfate is dissolved, and preparing an acidic aluminum source solution; mixing and stirring 128.6 g of sodium metaaluminate and 600g of deionized water until the sodium metaaluminate is completely dissolved to prepare the alkaline aluminum source solution.
(3) And (2) respectively and slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution by adopting a cocurrent flow adding mode at the water bath temperature of 70 ℃ under the condition of continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 8.5 by using an ammonia water solution, and standing and aging for 3 hours.
(4) And (4) adjusting the pH value of the slurry system obtained in the step (3) to 13 by using a sodium hydroxide dilute solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing the slurry system for 30 hours at the temperature of 100 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material C4.
Example 5
The method of the invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material
(1) 5545 g of sodium silicate, 144.7 g of sodium metaaluminate and 6300 g of deionized water are mixed and stirred for 2.5 hours at room temperature, then the mixture is kept stand and aged for 8 hours at the water bath temperature of 50 ℃, and the precursor solution of the Y-type molecular sieve is obtained after the mixture is cooled to room temperature.
(2) At room temperature, 588.2 g of aluminum sulfate and 810 g of deionized water are mixed and stirred until the aluminum sulfate is dissolved, and an acidic aluminum source solution is prepared; 144.7 g of sodium metaaluminate and 765 g of deionized water are mixed and stirred until the sodium metaaluminate is completely dissolved, so as to prepare the alkaline aluminum source solution.
(3) And (2) respectively and slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution by adopting a cocurrent flow adding mode at the water bath temperature of 60 ℃ under the condition of continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 9 by using an ammonia water solution, and standing and aging for 4 hours.
(4) And (3) adjusting the pH value of the slurry system obtained in the step (3) to 13.5 by using a sodium hydroxide dilute solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing the slurry system for 36 hours at the temperature of 90 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material C5.
Example 6
The method of the invention synthesizes the Y-shaped molecular sieve/macroporous alumina hybrid composite material
(1) Mixing 7109 g of sodium silicate, 160.8 g of sodium metaaluminate and 5000 g of deionized water at room temperature, stirring for 3 hours, standing and aging for 4 hours at the water bath temperature of 55 ℃, and cooling to room temperature to obtain a precursor solution of the Y-type molecular sieve.
(2) At room temperature, 653.6 g of aluminum sulfate and 1000 g of deionized water are mixed and stirred until the aluminum sulfate is dissolved, and an acidic aluminum source solution is prepared; 160.8 g of sodium metaaluminate and 950 g of deionized water are mixed and stirred until the sodium metaaluminate is completely dissolved, so as to prepare the alkaline aluminum source solution.
(3) And (2) respectively and slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution by adopting a cocurrent flow adding mode at the water bath temperature of 50 ℃ under the condition of continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 10 by using an ammonia water solution, and standing and aging for 5 hours.
(4) And (3) adjusting the pH value of the slurry system obtained in the step (3) to 14 by using a sodium hydroxide dilute solution, then transferring the slurry system into a high-pressure kettle, standing and crystallizing the slurry system for 48 hours at the temperature of 80 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material C6.
Example 7
Preparation of FCC catalyst containing conventional Y-type molecular sieve (hydrogen form)
According to the molecular sieve: aluminium sol (Al) 2 O 3 Mass meter): kaolin mass ratio =35:12:53, mixing and beating the metered Y-type molecular sieve (hydrogen type), alumina sol and kaolinAnd spraying, molding, roasting, washing and drying the slurry to obtain the FCC catalyst-1.
Example 8
Preparation of FCC catalyst containing Y-type molecular sieve/macroporous alumina hybrid composite material
According to the method, the Y-type molecular sieve/macroporous alumina hybrid composite material is prepared by the following steps: aluminium sol (Al) 2 O 3 Mass meter): kaolin mass ratio =35:12: and 53, mixing and pulping the metered Y-type molecular sieve/macroporous alumina hybrid composite material C3, alumina sol and kaolin, and then carrying out spray forming, roasting, washing and drying to obtain the FCC catalyst-2.
Table 2 lists the pore structure property parameters for the different samples. Compared with the conventional Y-type molecular sieve, the Y-type molecular sieve/macroporous alumina hybrid composite material C1-C6 synthesized by the method has the advantages that the total specific surface and the total pore volume are greatly improved, and the mesoporous specific surface and the mesoporous pore volume are obviously higher than those of the former, so that the defect of poor mass transfer and diffusion properties of heavy molecules of the conventional Y-type molecular sieve at present can be effectively overcome, and the heavy oil catalytic cracking reaction performance of an FCC catalyst is greatly improved.
TABLE 2 pore structure Properties of different samples
Table 3 lists the catalytic cracking reaction performance of heavy oil for different FCC catalysts. It can be seen that the heavy oil catalytic cracking reaction performance of the Y-type molecular sieve/macroporous alumina hybrid composite FCC catalyst-2 synthesized by the method is remarkably improved compared with that of the FCC catalyst-1 using the conventional Y-type molecular sieve. Compared with FCC catalyst-1, FCC catalyst-2, the yield of heavy oil and coke is reduced by 1.19 and 1.28 percentage points respectively, and the yield of gasoline and total liquid is increased by 3.02 and 2.96 percentage points respectively.
TABLE 3 heavy oil catalytic cracking reaction Performance of different FCC catalysts
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for synthesizing a Y-shaped molecular sieve/macroporous alumina hybrid composite material is characterized by comprising the following steps:
(1) Mixing and stirring sodium silicate, sodium metaaluminate and deionized water for 0.5 to 3 hours at room temperature, standing and aging for 4 to 24 hours at the water bath temperature of 30 to 55 ℃, and cooling to room temperature to obtain a Y-type molecular sieve precursor solution;
(2) Respectively mixing and stirring aluminum salt and sodium metaaluminate with deionized water at room temperature until the aluminum salt and the sodium metaaluminate are completely dissolved to respectively prepare an acidic aluminum source solution and an alkaline aluminum source solution;
(3) Respectively slowly adding the Y-type molecular sieve precursor solution and the alkaline aluminum source solution into the acidic aluminum source solution by adopting a parallel-flow adding mode at the water bath temperature of 50-95 ℃ under the condition of continuous stirring until the pH value of the system is 6.5, then adjusting the pH value of the system to 7-10 by using an ammonia water solution, and then standing and aging for 0.5-5 hours;
(4) And (3) adjusting the pH value of the slurry system obtained in the step (3) to 11-14 by using a sodium hydroxide dilute solution, then transferring the slurry system into an autoclave, standing and crystallizing the slurry system for 12-48 hours at the temperature of 80-150 ℃, and filtering, washing, drying and exchanging ammonium to obtain the Y-type molecular sieve/macroporous alumina hybrid composite material.
2. The synthesis method according to claim 1, wherein the mass ratio of sodium silicate, sodium metaaluminate and deionized water in step (1) is sodium Silicate (SiO) 2 Meter): sodium metaaluminate (in terms of Al) 2 O 3 Meter): deionized water =2 to 20:1:20 to 200.
3. The synthesis method according to claim 2, wherein the mass ratio of the sodium silicate, the sodium metaaluminate and the deionized water in the step (1) is sodium Silicate (SiO) 2 Counting): sodium metaaluminate (in terms of Al) 2 O 3 Counting): deionized water =5 to 15:1:50 to 150.
4. The synthesis method according to claim 1, wherein the aluminum salt in step (2) is one or more of aluminum chloride, aluminum nitrate, aluminum sulfate and aluminum hydroxychloride.
5. The method according to claim 4, wherein the aluminum salt in step (2) is aluminum sulfate.
6. The method according to claim 1, wherein the mass ratio of aluminum salt to deionized water in step (2) is aluminum salt (as Al) 2 O 3 Meter): deionized water =1:3 to 30.
7. The method according to claim 6, wherein the mass ratio of the aluminum salt to the deionized water in step (2) is aluminum salt (as Al) 2 O 3 Meter): deionized water =5 to 10.
8. The synthesis method according to claim 1, wherein the mass ratio of sodium metaaluminate to deionized water in step (2) is sodium metaaluminate (in terms of Al) 2 O 3 Counting): deionized water =1:2 to 20.
9. The method according to claim 8, wherein the mass ratio of sodium metaaluminate to deionized water in step (2) is sodium metaaluminate (as Al) 2 O 3 Meter): deionized water =4 to 10.
10. A Y-shaped molecular sieve/macroporous alumina hybrid composite material is characterized in that: the Y-type molecular sieve/macroporous alumina hybrid composite material is obtained by the synthesis method according to any one of claims 1 to 9.
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