CN113620312B - Preparation method of SAPO-20 zeolite molecular sieve with high crystallinity - Google Patents

Preparation method of SAPO-20 zeolite molecular sieve with high crystallinity Download PDF

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CN113620312B
CN113620312B CN202110973354.4A CN202110973354A CN113620312B CN 113620312 B CN113620312 B CN 113620312B CN 202110973354 A CN202110973354 A CN 202110973354A CN 113620312 B CN113620312 B CN 113620312B
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季筱楠
向梅
吴泽颖
邓瑶瑶
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Changzhou Institute of Technology
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Abstract

The invention relates to a preparation method of a high-crystallinity SAPO-20 zeolite molecular sieve, which is characterized by comprising the following steps: (1) Dissolving an aluminum source in water, adding a phosphorus source, stirring uniformly, adding a water glass solution, continuously stirring uniformly, then adding an amine template agent, and stirring 24h; the aluminum source is Al 2 O 3 The phosphorus source is expressed as P 2 O 5 The water glass is calculated by SiO 2 The molar weight ratio of the raw materials is Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 Amine templating agent = 0.8; (2) Transferring the mixture into a high-pressure reaction kettle, and carrying out crystallization reaction at 180-220 ℃ for 36-96h to obtain the SAPO-20 zeolite molecular sieve with high crystallinity. The crystallinity of the SAPO-20 zeolite molecular sieve prepared by the method can reach as high as 99.99 percent.

Description

Preparation method of SAPO-20 zeolite molecular sieve with high crystallinity
Technical Field
The invention relates to the technical field of synthesis of zeolite molecular sieves, in particular to a preparation method of a high-crystallinity SAPO-20 zeolite molecular sieve.
Background
SAPO-20, alPO-20 and sodalite are heterogeneous and isomorphous, belong to a cubic system, have a pore size of 0.3nm (six-membered ring), have an acidic surface, and can be well used as a catalyst, a catalyst carrier, an ion exchanger and an adsorbent for separating and purifying molecules, so that the SAPO-20, the AlPO-20 and the sodalite are widely concerned in the fields of industrial catalysis, adsorption separation, ion exchange and the like.
The synthesis of microporous SAPO-20 zeolite molecular sieve mainly includes hydrothermal crystallization, dry gel conversion, liquid phase crystallization and other methods. Wherein, the dry gel conversion method and the liquid phase crystallization method need to grind the prepared molecular sieve precursor, and the grain size of the ground dry gel has great influence on the crystallinity of the molecular sieve, and the process is complicated and uncontrollable. SAPO-34 molecular sieve is also used as a raw material to synthesize SAPO-20 by high-temperature crystallization with an alkali fusion method, but the method has large equipment loss due to overhigh alkalinity of a synthesis system and is difficult to operate. In other related researches, the SAPO-20 is synthesized by a hydrothermal crystallization method, but the hydrothermal crystallization method is accompanied by mixed crystals and eutectic phenomena, and the crystallinity is not high.
Therefore, we tried to develop a method for directly synthesizing a high-purity SAPO-20 zeolite molecular sieve. The water glass is used as a silicon source, so that the dependence of a synthesis system on strong alkaline inorganic salt is reduced, the guiding effect of an anion structure is further utilized, the synthesis process is simple, the corrosion to equipment is reduced, and the cost is greatly saved.
Disclosure of Invention
In order to solve the problem that the prior method can not directly synthesize SAPO-20 with high crystallinity, the preparation method of the SAPO-20 zeolite molecular sieve with high crystallinity is provided. The invention synthesizes the pure-phase SAPO-20 molecular sieve by using water glass as a silicon source and fully utilizing the structure-oriented action of anions.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of a high-crystallinity SAPO-20 zeolite molecular sieve comprises the following steps:
(1) Dissolving an aluminum source in water, adding a phosphorus source, uniformly stirring, adding a water glass solution, continuously uniformly stirring, adding an amine template, and stirring for 24 hours; the aluminum source is Al 2 O 3 The phosphorus source is expressed as P 2 O 5 The water glass is calculated as SiO 2 The molar weight ratio of each raw material is calculated as Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 Amine templating agent = 0.8;
(2) Transferring the mixture into a high-pressure reaction kettle, carrying out crystallization reaction at 180-220 ℃ for 36-96h, taking out the product, washing the product to be neutral, and carrying out suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve with high crystallinity.
Further, the aluminum source is pseudo-boehmite, and the phosphorus source is a phosphoric acid solution with the concentration of 85 wt%; the amine template agent is N, N, N ', N' -tetramethyl-1, 6-hexanediamine (TMHD).
Further, siO in the water glass solution 2 The concentration is 4.9581mol/L, na 2 O concentration of 1.5357mol/L, H 2 The concentration of O was 51.0692mol/L.
Preferably, the molar ratio of the raw materials is Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 Amine templating agent = 0.8.
Preferably, the temperature of the crystallization reaction is 200-210 ℃ and the time is 48-72h.
More preferably, the temperature of the crystallization reaction is 210 ℃ and the time is 48h. The hydrothermal time of the SAPO-20 molecular sieve synthesis process reported at present is 3-5 days, the crystallization time is increased to be beneficial to improving the crystallinity, and the crystallization time can be greatly reduced to 48 hours in the invention.
The beneficial technical effects are as follows:
the invention utilizes water glass as a silicon source, directly synthesizes SAPO-20 zeolite by a hydrothermal crystallization method, does not need a large amount of template agent and longer hydrothermal crystallization time, greatly improves the synthesis efficiency and reduces the synthesis cost. The synthetic method is simple and has low requirements on equipment, and enterprises producing the zeolite molecular sieve can put into production by utilizing the existing equipment.
Drawings
FIG. 1 is an XRD pattern of the product of examples 1-2, wherein curve a represents example 1 using silica gel and curve b represents example 2 using water glass.
FIG. 2 is an XRD pattern of the products of examples 2-6, wherein curve a represents example 2 with a silicon to phosphorus ratio of 0.6, curve b represents example 3 with a silicon to phosphorus ratio of 0.7, curve c represents example 4 with a silicon to phosphorus ratio of 0.8, curve d represents example 5 with a silicon to phosphorus ratio of 0.9, and curve e represents example 6 with a silicon to phosphorus ratio of 1.0.
FIG. 3 is an XRD pattern of the products of examples 6-10, wherein curve a represents nTMHD: nP 2 O 5 Example 6 with =1.5, curve b indicates nTMHD: nP 2 O 5 Example 7 with =1.4, curve c indicates nTMHD nP 2 O 5 Example 8 with =1.3, curve d indicates nTMHD: nP 2 O 5 Example 9 with =1.2, curve e indicates nTMHD: nP 2 O 5 Example 10 of = 1.1.
FIG. 4 is an XRD pattern of the products of examples 11-15, wherein curve a shows example 11 with a crystallization temperature of 180 deg.C, curve b shows example 12 with a crystallization temperature of 190 deg.C, curve c shows example 13 with a crystallization temperature of 200 deg.C, curve d shows example 14 with a crystallization temperature of 210 deg.C, and curve e shows example 15 with a crystallization temperature of 220 deg.C.
FIG. 5 is an XRD pattern of the products of examples 14 and 16-21, wherein curve a shows example 16 with crystallization time 24h, curve b shows example 17 with crystallization time 36h, curve c shows example 14 with crystallization time 48h, curve d shows example 18 with crystallization time 60h, curve e shows example 19 with crystallization time 72h, curve f shows example 20 with crystallization time 84h, and curve g shows example 21 with crystallization time 96h.
Figure 6 is an XRD pattern of the product of example 14, comparative example 1, where curve a represents comparative example 1 and curve b represents example 14.
FIG. 7 is a SEM image of the product of example 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely in the following description with reference to the embodiments of the present invention and the accompanying drawings. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, the numerical values set forth in these examples do not limit the scope of the invention. Techniques, methods known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards; if no corresponding national standard exists, the method is carried out according to the universal international standard or the standard requirement proposed by related enterprises. Unless otherwise indicated, all parts are parts by weight and all percentages are percentages by weight.
Used as follows H 3 PO 4 The solution concentration was 85wt%.
Example 1
Take 3.25g of pseudoboehmite with 21mL of H 2 O dilution and 4.2mL of H was added 3 PO 4 The solution was stirred for 30min. Silica gel 1.86g was added, followed by stirring with 9.8mL of TMHD for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out the product, washing with water to be neutral, and performing suction filtration and drying to obtain the product.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:0.6:1.5。
Example 2
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 3.7mL of water glass to 5.7mL of H 2 In O;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 In O;
4.2mL of H was added to the solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 9.8mL TMHD was added and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:0.6:1.5。
Example 3
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 4.3mL of water glass to 5.6mL of H 2 O is in;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 O is in;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 9.8mL TMHD was added and stirred for 24h. Then mixing the mixtureAnd (3) moving the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing the product to be neutral, and performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:0.7:1.5。
Example 4
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 4.9mL of water glass to 5.5mL of H 2 In O;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 In O;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 9.8mL TMHD was added and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:0.8:1.5。
Example 5
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 5.6mL of water glass to 5.4mL of H 2 In O;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 O is in;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 9.8mL TMHD was added and stirred for 24h. And then, the mixture is moved to a high-pressure reaction kettle to be sealed, the mixture reacts for 48 hours at the temperature of 220 ℃, a product is taken out, washed to be neutral, filtered and dried to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:0.9:1.5。
Example 6
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 6.2mL of water glass to 5.4mL of H 2 O is in;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 O is in;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 9.8mL TMHD was added and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:1.0:1.5。
Example 7
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 6.2mL of water glass to 5.4mL of H 2 O is in;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 O is in;
4.2mL of H was added to the solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 9.2mL TMHD was added and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:1.0:1.4。
Example 8
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 6.2mL of water glass to 5.4mL of H 2 O is in;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 O is in;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 8.5mL TMHD was added and stirred for 24h. And then, the mixture is moved to a high-pressure reaction kettle to be sealed, the mixture reacts for 48 hours at the temperature of 220 ℃, a product is taken out, washed to be neutral, filtered and dried to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:1.0:1.3。
Example 9
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 6.2mL of water glass to 5.4mL of H 2 O is in;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 O is in;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 7.9mL TMHD was added and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:1.0:1.2。
Example 10
Water glass composition, siO 2 :4.9581mol/L，Na 2 O:1.5357mol/L，H 2 O:51.0692mol/L；
Solution A: dissolve 6.2mL of water glass to 5.4mL of H 2 In O;
solution B: 3.25g of pseudo-boehmite was dissolved in 15mL of H 2 In O;
4.2mL of H was added to solution B 3 PO 4 The solution was stirred for 30min, then solution A was added dropwise, stirred for another 30min, then 7.2mL TMHD was added and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 220 ℃ for 48 hours, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
Molar ratio of materials in the system Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMHD＝0.8:40:1.0:1.0:1.1。
Examples 11 to 15
The products of examples 11 to 15 were prepared in the same manner as in example 9 except that the crystallization reaction temperature was different.
The crystallization reaction temperature of example 11 was 180 ℃.
The crystallization reaction temperature of example 12 was 190 ℃.
The crystallization reaction temperature of example 13 was 200 ℃.
The crystallization reaction temperature of example 14 was 210 ℃.
The crystallization reaction temperature of example 15 was 220 ℃.
Examples 16 to 21
The products of examples 16 to 21 were prepared in the same manner as in example 14 except that the crystallization reaction time was varied.
The crystallization reaction time of example 16 was 24 hours.
The crystallization reaction time of example 17 was 36h.
The crystallization reaction time of example 18 was 60h.
The crystallization reaction time of example 19 was 72 hours.
The crystallization reaction time of example 20 was 84h.
The crystallization reaction time of example 21 was 96 hours.
Comparative example 1
The preparation method is reported in literature 'synthesis of silicoaluminophosphate molecular sieves SAPO-11, SAPO-34 and SAPO-20' and comprises dissolving 3.25g of pseudo-boehmite in 16.8mL of H 2 O, and 4.2mL of H was added thereto 3 PO 4 The solution was stirred for 30min, after which 1.49g of SiO were added 2 Then, the mixture was stirred for another 30min, and then 9.8mL of TMAOH was added thereto and stirred for 24h. And then transferring the mixture into a high-pressure reaction kettle, sealing, reacting at 200 ℃ for 120h, taking out a product, washing to be neutral, performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve.
The molar ratio of all materials in the system is Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 :TMAOH＝1.0:40:1.0:1.0:3.75。
The reaction parameters of the above examples and comparative examples are shown in Table 1.
XRD tests were performed on the products of the above examples and comparative examples and the crystallinity was calculated, and the results are shown in Table 1.
TABLE 1 reaction parameters of examples and comparative examples
Figure GDA0003946440510000071
Figure GDA0003946440510000081
Results and discussion:
experimental example 1-2 compares whether different silicon sources can synthesize SAPO-20 zeolite in the system, and it can be known from the crystallinity of table 1 and the XRD spectrum of fig. 1 that SAPO-20 zeolite can be synthesized only by using water glass as a silicon source. In the experiment that only the silicon source is changed and treated under the same hydrothermal condition, silica gel is used as the silicon source (example 1), and the strong diffraction peak of AFX type (SAPO-56) zeolite and the weak diffraction peak of SOD type (SAPO-20) zeolite are observed on the corresponding XRD spectrogram; using water glass as the silicon source (example 2), strong diffraction peaks of the SOD type (SAPO-20) zeolite were observed on the corresponding XRD spectrum. Thus, the present invention balances the cations (i.e., na) of the negative charge of the backbone + ) The process of promoting the crystal transformation of the SAPO-56 zeolite into the SAPO-20 has a significant influence.
Experimental examples 2-6 compare whether SAPO-20 zeolite can be synthesized in the system with different phosphorus-silicon ratios, and it can be known from the crystallinity of Table 1 and the XRD pattern of FIG. 2 that SAPO-20 zeolite can be synthesized with a phosphorus-silicon ratio of 0.7-1.0, and the crystallinity of SAPO-20 zeolite synthesized with a phosphorus-silicon ratio of 1.0 is slightly higher than that of SAPO-20 zeolite synthesized with phosphorus-silicon ratios of 0.9, 0.8 and 0.7. Therefore, the phosphorus-silicon ratio of 1.0 is the best mixture ratio.
Experimental examples 6-10 comparing whether SAPO-20 zeolite can be synthesized in the system by different amounts of template agent, it can be seen from the crystallinity of Table 1 and XRD pattern of FIG. 3 that at nTMHD/nP 2 O 5 SAPO-20 zeolite, nTMHD/nP, can be synthesized when the values are 1.5, 1.4, 1.3, 1.2 and 1.1 2 O 5 The crystallinity of SAPO-20 zeolite synthesized when the zeolite is not less than 1.2 is higher than nTMHD/nP 2 O 5 SAPO-20 zeolite with the synthesis of =1.4 and 1.3, thus nTMHD/nP 2 O 5 Optimally, = 1.2.
Experimental examples 11-15 comparing whether SAPO-20 zeolite can be synthesized in the system at different crystallization temperatures, it can be seen from the crystallinity of Table 1 and the XRD pattern of FIG. 4 that the crystallinity of SAPO-20 zeolite gradually increases with the increase of crystallization temperature. However, at excessively high temperatures, e.g., above 240 ℃, the characteristic peak intensity of the XRD pattern is much lower, and the corresponding crystallinity is considerably lower. Therefore, the crystallization temperature is selected to be 210 ℃ as the optimum temperature.
Example 14 and experimental examples 16 to 21, comparing whether SAPO-20 zeolite can be synthesized in the system with different crystallization times, it can be seen from the crystallinity of table 1 and the XRD pattern of fig. 5 that SAPO-20 can be synthesized with a crystallization time of 36 to 72 hours, and as the crystallization time is increased, the crystallinity of SAPO-20 zeolite is increased and then decreased, and therefore, the optimum crystallization time is selected as 48 hours.
Comparative example 1 and experimental example 14 compare the crystallinity of SAPO-20 zeolite prepared by the prior art synthesis method and the optimal synthesis scheme of the present invention, and it can be seen from the crystallinity of table 1 and the XRD spectrum of fig. 6 that the crystallinity of SAPO-20 zeolite has significant difference under different formulations and different material ratios, compared with the literature test scheme, the present invention replaces the silicon source with water glass, replaces the template agent with the synthesis condition of TMHD, and can still synthesize SAPO-20 zeolite with high crystallinity under a shorter hydrothermal time, and the crystallinity of SAPO-20 zeolite synthesized by the present invention reaches 99.99%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (3)

1. A preparation method of a high-crystallinity SAPO-20 zeolite molecular sieve is characterized by comprising the following steps:
(1) Dissolving pseudo-boehmite in water, adding phosphoric acid solution with the concentration of 85wt%, uniformly stirring, adding water glass solution, continuously uniformly stirring, then adding N, N, N ', N' -tetramethyl-1, 6-hexanediamine, and further stirring for 24 hours; the pseudo-boehmite is Al 2 O 3 In terms of P, the phosphoric acid 2 O 5 The water glass is calculated by SiO 2 The molar weight ratio of the raw materials is Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 N, N' -tetramethyl-1, 6-hexanediamine = 0.8;
SiO in the water glass solution 2 The concentration is 4.9581mol/L, na 2 O concentration of 1.5357mol/L, H 2 The concentration of O is 51.0692mol/L;
(2) Transferring the mixture into a high-pressure reaction kettle, performing crystallization reaction at the temperature of between 200 and 210 ℃ for 48 to 72 hours, taking out a product, washing the product to be neutral, and performing suction filtration and drying to obtain the SAPO-20 zeolite molecular sieve with high crystallinity.
2. The method of claim 1, wherein the molar ratio of the raw materials is Al 2 O 3 :H 2 O:P 2 O 5 :SiO 2 N, N' -tetramethyl-1, 6-hexanediamine = 0.8.
3. The method for preparing the SAPO-20 zeolite molecular sieve with high crystallinity according to claim 1, wherein the temperature of the crystallization reaction is 210 ℃ and the time is 48h.
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