Ana-structured offretite and method for its preparation

Abstract

The present disclosure relates to an ANA-structure faujasite zeolite and a preparation method thereof, a unit cell chemical formula of the ANA-structure faujasite zeolite being |Na x |[Si y Al z O 96 ] wherein x = 6-15, y = 30-37, and z = 10-16; the ANA-structure faujasite zeolite has a spherical crystal morphology. The ANA-structure faujasite zeolite of the present disclosure has a spherical crystal morphology and exhibits excellent molecular diffusion performance, and has good application prospects in the fields of small molecule acid catalytic reactions, small molecule gas adsorption separation, ion adsorption purification, and the like.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of inorganic material synthesis, in particular, to an ANA-structured analcime and a preparation method thereof. BACKGROUND

[0002] Analcime is a rare natural zeolite mineral, which belongs to the ANA-type topology and has a small microporous structure formed by highly twisted eight-membered rings (0.42 x 0.16 nm) and six-membered rings, four-membered rings. As an important mineral resource, analcime has unique pore structure and crystal chemical properties, and has good application prospects and development value in selective catalysis of small molecules, ion adsorption reaction, ion exchange for water purification and contaminated soil remediation, treatment of wastewater containing fluorine and heavy metal ions, extraction of high-value trace metals from salt lake brine, adsorption and storage of radioactive substances, etc.

[0003] Compared with natural analcime, which has the disadvantages of low purity, high impurity content, and unstable chemical composition, artificially synthesized analcime has the advantages of high purity, complete crystal structure, adjustable chemical stability and physicochemical properties, and is therefore convenient for large-scale use. In the existing methods for synthesizing analcime, conventional silicon and aluminum sources can be used for hydrothermal synthesis, and fly ash, geopolymer, illite, and coal gangue can also be used as raw materials for synthesis. However, the existing methods have complex preparation processes and harsh conditions, and the synthesized analcime crystals have a large size and a generally polyhedral morphology, a low acid content, and a poor molecular diffusion effect. SUMMARY

[0004] The purpose of the present disclosure is to provide an ANA-structured analcime and a preparation method thereof to simplify the preparation process and improve the crystal morphology of analcime.

[0005] To achieve the above-mentioned purpose, the present disclosure provides an ANA-structured analcime in a first aspect, wherein the unit cell chemical formula of the ANA-structured analcime is |Na x |[Si y Al z O 96 ], wherein x = 6-15, y = 30-37, and z = 10-16; and the ANA-structured analcime has a spherical crystal morphology.

[0006] Optionally, the ANA-structured analcime has a surface-roughened hollow spherical crystal morphology, and the diameter of the sphere is 2-10 μm.

[0007] Optionally, the total acid content of the ANA-structured analcime is not less than 210 μmol·g -1 .

[0008] In a first aspect, the present disclosure provides a method for preparing the ANA-structured analcime zeolite of the first aspect of the present disclosure, the method comprising:

[0009] mixing the NaY molecular sieve, the template agent and the optional water to obtain an initial mixture;

[0010] crystallizing the initial mixture to obtain a crystallization product.

[0011] Optionally, the initial mixture has a molar composition of SiO2 / Al2O3 = 2-10, NaOH / SiO2 = 0.2-0.6, R / SiO2 = 0.05-0.8, and H2O / SiO2 = 5-40, wherein SiO2 represents the number of moles of SiO2 contained in the NaY molecular sieve, Al2O3 represents the number of moles of Al2O3 contained in the NaY molecular sieve, NaOH represents the number of moles of NaOH contained in the NaY molecular sieve, R represents the number of moles of the template agent, and H2O represents the number of moles of water.

[0012] Optionally, the initial mixture has a molar composition of SiO2 / Al2O3 = 3-8, NaOH / SiO2 = 0.3-0.5, R / SiO2 = 0.1-0.5, and H2O / SiO2 = 8-20, wherein SiO2 represents the number of moles of SiO2 contained in the NaY molecular sieve, Al2O3 represents the number of moles of Al2O3 contained in the NaY molecular sieve, NaOH represents the number of moles of NaOH contained in the NaY molecular sieve, R represents the number of moles of the template agent, and H2O represents the number of moles of water.

[0013] Optionally, the template agent is tetraethylammonium hydroxide.

[0014] Optionally, the crystallization conditions include a temperature of 130-170°C and a time of 40-80 hours.

[0015] Optionally, the crystallization conditions include a temperature of 140-160°C and a time of 45-75 hours.

[0016] Optionally, the method further comprises the steps of washing, filtering and drying the crystallization product, and optionally, ammonium exchange treatment and calcination.

[0017] By the above technical solution, the present disclosure synthesizes the ANA-structured analcime zeolite using the NaY molecular sieve as a raw material, without adding inorganic alkali and without needing an aging or aging process before crystallization, and the raw material and the preparation process are simple, and the production cost is low. The ANA-structured analcime zeolite of the present disclosure has a spherical crystal morphology and exhibits excellent molecular diffusion performance, and has a good application prospect in the fields of small molecule acid catalytic reaction, small molecule gas adsorption separation, ion adsorption purification, etc.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, illustrate embodiments of the present disclosure and together with the detailed description, serve to explain the present disclosure. In the drawings:

[0020] Figure 1 is the XRD spectrum of the NaY molecular sieve used in the examples and the ANA-structured aluminosilicate synthesized in the examples and comparative examples;

[0021] Figure 2 is the SEM photo of the NaY molecular sieve used in Example 1;

[0022] Figure 3 is the SEM photo of the ANA-structured aluminosilicate synthesized in Example 1;

[0023] Figure 4 is the SEM photo of the ANA-structured aluminosilicate synthesized in Example 2;

[0024] Figure 5 is the SEM photo of the ANA-structured aluminosilicate synthesized in Example 3. DETAILED DESCRIPTION

[0025] The detailed description of the present disclosure will be described below in conjunction with the accompanying drawings. It should be understood that the detailed description described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] In a first aspect, the present disclosure provides an ANA-structured aluminosilicate, wherein the unit cell chemical formula of the ANA-structured aluminosilicate is |Na x |[Si y Al z O 96 ], wherein x = 6-15, y = 30-37, and z = 10-16. The ANA-structured aluminosilicate has a spherical crystal morphology, and further has a surface rough hole ball crystal morphology. In one embodiment, the diameter of the sphere can be 2-10 μm. The ANA-structured aluminosilicate has a high acid amount. In one embodiment, the total acid amount of the ANA-structured aluminosilicate is not less than 210 μmol·g -1 , for example, can be 210-400 μmol·g -1 .

[0027] In a second aspect, the present disclosure provides a method for preparing the ANA-structured aluminosilicate of the first aspect of the present disclosure, the method comprising:

[0028] mixing a NaY molecular sieve, a template agent and optionally water to obtain an initial mixture;

[0029] crystallizing the initial mixture to obtain a crystallization product.

[0030] The initial mixture has a molar composition of SiO2 / Al2O3=2-10, NaOH / SiO2=0.2-0.6, R / SiO2=0.05-0.8, and H2O / SiO2=5-40, wherein SiO2 represents the molar number of SiO2 contained in the NaY molecular sieve, Al2O3 represents the molar number of Al2O3 contained in the NaY molecular sieve, NaOH represents the molar number of NaOH contained in the NaY molecular sieve, R represents the molar number of the template agent, and H2O represents the molar number of water.

[0031] In a preferred embodiment, the initial mixture has a molar composition of SiO2 / Al2O3=3-8, NaOH / SiO2=0.3-0.5, R / SiO2=0.1-0.5, and H2O / SiO2=8-20, wherein SiO2 represents the molar number of SiO2 contained in the NaY molecular sieve, Al2O3 represents the molar number of Al2O3 contained in the NaY molecular sieve, NaOH represents the molar number of NaOH contained in the NaY molecular sieve, R represents the molar number of the template agent, and H2O represents the molar number of water.

[0032] The NaY molecular sieve is not particularly limited in the present disclosure, as long as it can satisfy the molar composition of the initial mixture described above (i.e., SiO2 / Al2O3=2-10, NaOH / SiO2=0.2-0.6, preferably SiO2 / Al2O3=3-8, NaOH / SiO2=0.3-0.5 for the NaY molecular sieve), and can be a commercially available product or prepared by a conventional method in the art.

[0033] The template agent can be tetraethylammonium hydroxide. The crystallization can be static or dynamic crystallization. The crystallization conditions can include a temperature of 130-170°C and a time of 40-80 hours. Preferably, the crystallization conditions include a temperature of 140-160°C and a time of 45-75 hours.

[0034] The method can further include the steps of washing, filtering and drying the crystallization product. Further, the drying conditions can include a temperature of 70-120°C and a time of 6-12 hours, and the ANA-structured analcime raw powder can be obtained after drying.

[0035] Further, the method can further include: performing one or more ammonium exchange treatments on the ANA-structure-analcime crude powder (for example, stirring and mixing the ANA-structure-analcime, ammonium chloride, and deionized water according to a weight ratio of 1:0.3:20, heating to 70°C and stirring for 2h), washing, filtering, and drying to obtain an ammonium-type ANA-structure-analcime, and then calcining the ammonium-type ANA-structure-analcime (for example, at 550°C for 3h) to obtain a hydrogen-type ANA-structure-analcime.

[0036] The ANA-structure-analcime described in the present disclosure has good application prospects in the fields of small-molecule acid catalytic reactions, small-molecule gas adsorption separation, and ion adsorption purification.

[0037] The present disclosure is further described below through examples, but the present disclosure is not limited by the examples.

[0038] In the following examples, X-ray powder diffraction phase analysis (XRD) is performed by using a PanaCn Empyrean diffractometer from the Netherlands, which is equipped with a PIXcel 3D detector. The test conditions are as follows: Cu target, Kα radiation, Ni filter, tube voltage 40kV, tube current 40mA, and scanning range 5-50°.

[0039] In the following examples, scanning electron microscope topography analysis (SEM) is performed by using a Hitachi S4800 scanning electron microscope from Japan. After drying and grinding treatment of the sample, the sample is adhered to conductive glue. The analysis electron microscope acceleration voltage is 5.0kV, and the magnification is 20-800000 times.

[0040] In the following examples, X-ray fluorescence analysis (XRF analysis) is performed by using a Philips MagiX fluorescence spectrometer. The test conditions are as follows: tungsten target, excitation voltage 40kV, and excitation current 50mA. The intensities of characteristic spectral lines of each element are determined by using a scintillation counter and a proportional counter, and semi-quantitative analysis of the elements is performed.

[0041] In the following examples, ammonia temperature programmed desorption (NH3-TPD analysis) is performed by using an Autochem II 920 temperature programmed desorption instrument from the United States. The test conditions are as follows: 0.2g of 20-40 mesh molecular sieve is weighed and loaded into a sample tube, and placed in a thermal conductivity cell heating furnace. He gas is used as the carrier gas (25mL·min -1 ), and the temperature is raised to 600°C at a rate of 20℃·min -1 . The temperature is then lowered to 100°C, and kept constant for 10min. Then, the carrier gas is switched to NH3-He mixed gas (10% NH3+90%He) for adsorption for 30min, and then continues to be blown with He gas for 90min until the baseline is stable, so as to desorb the physically adsorbed ammonia. The temperature is then raised to 600°C at a rate of 10℃·min -1The temperature was raised to 600℃ at a programmed rate for desorption, and maintained for 30 min. The total acid amount was obtained by TCD detector and automatic integration of the instrument.

[0042] In the following examples, the testing instrument for BET analysis was Micromeritics ASAP 2010 adsorption instrument. The test conditions were as follows: the weighed sample was vacuumized to 1.33×10 -2 Pa at 350℃ for 15 h for sample pretreatment. The adsorption and desorption amounts of nitrogen at different p / p0 were measured at -196℃ in liquid nitrogen to obtain the nitrogen adsorption-desorption isotherm. The BET specific surface area was calculated by BET formula, the micropore specific surface area and micropore volume were calculated by t-plot method, and the total pore volume was calculated by the adsorption amount at P / P0=0.98.

[0043] The NaY molecular sieve raw material used in the following examples was purchased from Sinopec Yanshan Petrochemical Science and Technology Co., Ltd.

[0044] Example 1

[0045] The XRD spectrum of the NaY molecular sieve used in this example is shown in Figure 1 , and the SEM photo is shown in Figure 2 . The chemical composition of the NaY molecular sieve was analyzed by XRF, and the composition was Na2O 12.7 wt%, Al2O3 21.3 wt%, SiO2 65.7 wt%, Fe2O3 0.0826 wt% and other low content impurities, and the molar ratio SiO2 / Al2O3 was calculated to be 5.234, and the NaOH / SiO2 was 0.375. The NaY molecular sieve was calcined in a muffle furnace at a programmed temperature to 550℃ for 3 h to measure the solid content of the NaY molecular sieve, which was 74.10 wt%, and the BET analysis was performed, and the specific surface area was 732 m 2 ·g -1 , and the pore volume was 0.348 cm 3 ·g -1 .

[0046] 2.711 g of deionized water was taken into a polytetrafluoroethylene liner, 6.136 g of tetraethylammonium hydroxide TEAOH (35 wt%) was added and stirred uniformly, and then 6 g of NaY molecular sieve was added and stirred uniformly to obtain an initial mixture with a molar composition of SiO2 / Al2O3=5.234, NaOH / SiO2=0.375, TEAOH / SiO2=0.3, and H2O / SiO2=10.

[0047] The polytetrafluoroethylene liner containing the above initial mixture was sealed and placed in a rotating oven at a speed of 20 r / min. It was then crystallized at 155°C for 48 hours under autogenous pressure. After crystallization was completed, the product was removed by cooling to room temperature, filtered, washed, and dried at 80°C for 12 hours to obtain a solid sample (denoted as S1).

[0048] The obtained solid sample was subjected to X-ray diffraction analysis, and the XRD pattern is shown in the figure. Figure 1 The XRD spectra of the synthesized analcime were compared with those in the literature (Microporous & Mesoporous Materials, 2005, 86(1-3): 106-111.). Figure 1 Confirmed to be a pure-phase ANA structured azirsite. SEM images are shown below. Figure 3 The structure is characterized by porous spherical crystals with a rough surface, and the spheres are approximately 5.0 μm in diameter. XRF elemental analysis of the synthesized ANA-structured azolithium powder revealed its unit cell chemical formula to be |Na... 9.42 |[Si 34.61 Al 14.71 O 96 ].

[0049] The synthesized ANA-structured analcime powder was subjected to ammonium exchange treatment. Analcime, ammonium chloride, and deionized water were mixed at a weight ratio of 1:0.3:20, heated to 70℃ and stirred for 2 hours. The mixture was washed, filtered, and subjected to ammonium exchange treatment twice. After drying, ammonium-form analcime was obtained, which was then calcined at 550℃ for 3 hours to obtain hydrogen-form analcime. Acidity analysis of the hydrogen-form analcime using NH3-TPD showed a total acidity of 234.1 μmol·g⁻¹. -1 .

[0050] Example 2

[0051] Add 5.371 g of deionized water to the polytetrafluoroethylene liner, add 2.045 g of tetraethylammonium hydroxide (TEAOH) (35% by weight) and stir until homogeneous, then add 6 g of NaY molecular sieve (the same as in Example 1) and stir until homogeneous. The initial mixture has the following molar composition: SiO2 / Al2O3 = 5.234, NaOH / SiO2 = 0.375, TEAOH / SiO2 = 0.1, H2O / SiO2 = 10.

[0052] The polytetrafluoroethylene liner containing the above initial mixture was sealed and placed in a rotating oven at a speed of 20 r / min. It was then crystallized at 145°C for 72 hours under autogenous pressure. After crystallization was completed, the product was removed by cooling to room temperature, filtered, washed, and dried at 80°C for 12 hours to obtain a solid sample (denoted as S2).

[0053] The obtained solid sample was subjected to X-ray diffraction analysis, and the XRD pattern is shown in the figure.Figure 1 It is a pure-phase ANA structured zeolite, SEM image shown. Figure 4 The structure is characterized by porous spherical crystals with a rough surface, and the spheres are approximately 2.4 μm in diameter. XRF elemental analysis of the synthesized ANA-structured azolithium powder revealed its unit cell chemical formula to be |Na... 10.32 |[Si 35.12 Al 13.73 O 96 ].

[0054] The synthesized ANA-structured analcime powder was subjected to ammonium exchange treatment. Analcime, ammonium chloride, and deionized water were mixed at a weight ratio of 1:0.3:20, heated to 70℃ and stirred for 2 hours. The mixture was washed, filtered, and subjected to ammonium exchange treatment twice. After drying, ammonium-form analcime was obtained, which was then calcined at 550℃ for 3 hours to obtain hydrogen-form analcime. Acidity analysis of the hydrogen-form analcime using NH3-TPD showed a total acidity of 298.3 μmol·g. -1 .

[0055] Example 3

[0056] ANA-structured zeolite was synthesized according to the method in Example 2, except that the amount of template agent added was TEAOH / SiO2 = 0.2.

[0057] The XRD pattern of the obtained solid sample (denoted as S3) is shown in the figure. Figure 1 It is a pure-phase ANA-structured zeolite. See SEM image below. Figure 5 The structure is characterized by porous spherical crystals with a rough surface, and the spheres have a diameter of approximately 3.7–9.2 μm. XRF elemental analysis of the synthesized ANA-structured azathoic zeolite powder revealed its unit cell chemical formula to be |Na... 9.70 |[Si 35.01 Al 14.08 O 96 ].

[0058] The synthesized ANA-structured analcime powder was subjected to ammonium exchange treatment. Analcime, ammonium chloride, and deionized water were mixed at a weight ratio of 1:0.3:20, heated to 70℃ and stirred for 2 hours. The mixture was washed, filtered, and subjected to ammonium exchange treatment twice. After drying, ammonium-form analcime was obtained. Calcination at 550℃ for 3 hours yielded hydrogen-form analcime. Acidity analysis of the hydrogen-form analcime using NH3-TPD showed a total acidity of 219.2 μmol·g⁻¹. -1 .

[0059] Example 4

[0060] ANA-structured zeolite was synthesized according to the method in Example 2, except that the amount of template agent added was TEAOH / SiO2 = 0.4, and the crystallization conditions were 145°C for 48 hours.

[0061] The XRD spectrum of the obtained solid sample (denoted as S4) is shown in Figure 1. Figure 1 The SEM analysis confirmed that the structure morphology of the as-synthesized pure phase ANA-structured faujasite zeolite was hollow sphere with rough surface, and the diameter of the sphere was about 4.3-7.1 μm. The XRF elemental analysis of the as-synthesized ANA-structured faujasite zeolite showed that the unit cell chemical formula was |Na 10.17 |[Si 35.13 Al 13.77 O 96 ] with a total acid amount of 305.7 μmol·g -1 .

[0062] Example 5

[0063] The ANA-structured faujasite zeolite was synthesized according to the method of Example 2, except that the crystallization condition was 130 °C for 40 hours.

[0064] The XRD spectrum of the obtained solid sample was similar to that of S1-S4, and the as-synthesized pure phase ANA-structured faujasite zeolite had a hollow sphere structure with rough surface, and the diameter of the sphere was about 2.0-3.3 μm. The XRF elemental analysis of the as-synthesized ANA-structured faujasite zeolite showed that the unit cell chemical formula was |Na 10.01 |[Si 34.67 Al 14.44 O 96 ] with a total acid amount of 216.9 μmol·g -1 .

[0065] Example 6

[0066] The ANA-structured faujasite zeolite was synthesized according to the method of Example 2, except that the crystallization condition was 170 °C for 80 hours.

[0067] The XRD spectrum of the obtained solid sample was similar to that of S1-S4, and the as-synthesized pure phase ANA-structured faujasite zeolite had a hollow sphere structure with rough surface, and the diameter of the sphere was about 4 μm. The XRF elemental analysis of the as-synthesized ANA-structured faujasite zeolite showed that the unit cell chemical formula was |Na 10.47 |[Si 35.20 Al 13.57 O 96 ] with a total acid amount of 217.8 μmol·g -1 .

[0068] Comparative Example 1

[0069] Take 10.765 grams of deionized water into a polytetrafluoroethylene liner, add 3.257 grams of tetraethylammonium hydroxide TEAOH (35% by weight fraction), stir until uniform, then add 2 grams of NaY molecular sieve identical to that of Example 1, stir until uniform, then add 4.053 grams of solid silica gel (SiO2 90.72% by weight fraction), to obtain an initial mixture having a molar composition of SiO2 / Al2O3 = 25, NaOH / SiO2 = 0.078, TEAOH / SiO2 = 0.1, H2O / SiO2 = 10.

[0070] Seal the polytetrafluoroethylene liner containing the above initial mixture, place it in a rotating oven, set the rotation speed to 20 r / min, and crystallize at 155°C for 48 hours under autogenous pressure. After the crystallization is completed, take out the product after it has cooled to room temperature, filter, wash, and dry at 80°C for 12 hours to obtain a solid sample (designated D1).

[0071] The obtained solid sample is subjected to X-ray diffraction analysis, and the XRD spectrum is shown in Figure 1. Figure 1 It is a Y molecular sieve and cannot synthesize an ANA structure chabazite.

[0072] Comparative Example 2

[0073] Take 8.648 grams of deionized water into a polytetrafluoroethylene liner, add 6.513 grams of tetraethylammonium hydroxide TEAOH (35% by weight fraction), stir until uniform, then add 2 grams of NaY molecular sieve identical to that of Example 1, stir until uniform, then add 4.053 grams of solid silica gel (SiO2 90.72% by weight fraction), to obtain an initial mixture having a molar composition of SiO2 / Al2O3 = 25, NaOH / SiO2 = 0.078, TEAOH / SiO2 = 0.2, H2O / SiO2 = 10.

[0074] Seal the polytetrafluoroethylene liner containing the above initial mixture, place it in a rotating oven, set the rotation speed to 20 r / min, and crystallize at 145°C for 72 hours under autogenous pressure. After the crystallization is completed, take out the product after it has cooled to room temperature, filter, wash, and dry at 80°C for 12 hours to obtain a solid sample (designated D2).

[0075] The obtained solid sample is subjected to X-ray diffraction analysis, and the XRD spectrum is shown in Figure 2. Figure 1 It is a Y molecular sieve and cannot synthesize an ANA structure chabazite.

[0076] Comparative Example 3

[0077] Take 4.414 grams of deionized water into the polytetrafluoroethylene liner, add 13.026 grams of tetraethylammonium hydroxide TEAOH (35% by weight fraction), stir until uniform, then add 2 grams of NaY molecular sieve, stir until uniform, then add 4.053 grams of solid silica gel (SiO2 weight fraction 90.72%), to obtain an initial mixture with a molar composition of: SiO2 / Al2O3=25, NaOH / SiO2=0.078, TEAOH / SiO2=0.4, H2O / SiO2=10.

[0078] The polytetrafluoroethylene liner containing the above initial mixture is sealed with a cover and placed in a rotating oven, with the rotation speed set to 20 r / min, and crystallized at 145°C for 48 hours under autogenous pressure. After the crystallization is completed, the product is removed after cooling to room temperature, filtered, washed, and dried at 80°C for 12 hours to obtain a solid sample (denoted as D3).

[0079] The obtained solid sample is subjected to X-ray diffraction analysis, and the XRD spectrum is shown in FIG. 2. Figure 1 It is a mixed phase of Y molecular sieve and beta molecular sieve, and cannot synthesize ANA structure analcime.

[0080] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0081] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0082] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. An ANA-structured aragonite, characterized in that, The ANA-structured zeolite has the following crystal cell chemical formula: |Na x |[Si y Al z O 96 ], where x = 6-15, y = 30-37, z = 10-16; the ANA structured zeolite has a spherical crystal morphology.

2. The ANA-structured analcime according to claim 1, wherein, The ANA structured zeolite has a rough, porous spherical crystal morphology with a sphere diameter of 2–10 μm.

3. The ANA-structured anabolic zeolite according to claim 1 or 2, wherein, The total acidity of the ANA-structured zeolite is not less than 210 μmol·g. -1 .

4. A method for preparing the ANA-structured analcime according to any one of claims 1 to 3, characterized in that, The method includes: NaY molecular sieve, template agent and optional water are mixed to obtain an initial mixture; The initial mixture was crystallized to obtain a crystallized product.

5. The method according to claim 4, wherein, The initial mixture has the following molar composition: SiO2 / Al2O3 = 2-10, NaOH / SiO2 = 0.2-0.6, R / SiO2 = 0.05-0.8, H2O / SiO2 = 5-40, where SiO2 represents the number of moles of SiO2 contained in the NaY molecular sieve, Al2O3 represents the number of moles of Al2O3 contained in the NaY molecular sieve, NaOH represents the number of moles of NaOH contained in the NaY molecular sieve, R represents the number of moles of template agent, and H2O represents the number of moles of water.

6. The method according to claim 4 or 5, wherein, The initial mixture has the following molar composition: SiO2 / Al2O3 = 3-8, NaOH / SiO2 = 0.3-0.5, R / SiO2 = 0.1-0.5, H2O / SiO2 = 8-20, where SiO2 represents the number of moles of SiO2 contained in the NaY molecular sieve, Al2O3 represents the number of moles of Al2O3 contained in the NaY molecular sieve, NaOH represents the number of moles of NaOH contained in the NaY molecular sieve, R represents the number of moles of template agent, and H2O represents the number of moles of water.

7. The method according to claim 4, wherein, The template agent is tetraethylammonium hydroxide.

8. The method according to claim 4, wherein, The crystallization conditions include a temperature of 130–170°C and a time of 40–80 hours.

9. The method according to claim 8, wherein, The crystallization conditions include a temperature of 140–160°C and a time of 45–75 hours.

10. The method according to claim 4, wherein, The method also includes washing, filtering and drying the crystallized product, as well as optional ammonium exchange treatment and calcination steps.

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