A M-SSZ-13 molecular sieve and its preparation method and application

Abstract

The invention discloses a M-SSZ-13 molecular sieve and its preparation method and application, belonging to the technical field of catalytic materials. The preparation method disclosed in the invention first mixes ionic liquid, water, structure directing agent, aluminum source, silicon source and seed crystal, and then performs crystallization reaction to obtain a reaction product; the reaction product is successively dried and roasted to obtain H-SSZ-13 molecular sieve; then, the H-SSZ-13 molecular sieve is modified with an active metal M precursor solution to obtain M-SSZ-13 molecular sieve. The preparation method disclosed in the invention has the advantages of high yield, short process flow, low energy consumption, low cost, low wastewater generation, etc., and is easy to realize large-scale industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of catalytic materials, and specifically relates to an M-SSZ-13 molecular sieve and a preparation method and application thereof. Background Art

[0002] Molecular sieves are an important class of adsorption / catalytic materials. They have regular windows, uniform pores, large specific surface area, and suitable acidity and other physical and chemical properties. They have outstanding advantages in the fields of petrochemicals, fine chemicals, and environmental protection, and have been widely studied and applied. In recent years, M-SSZ-13 molecular sieves containing active metals have shown great application prospects in various fields. For example, Cu-SSZ-13 molecular sieves have excellent catalytic activity and hydrothermal stability, and have been used in the removal of NO from diesel exhaust. x The high-efficiency treatment process has been commercialized on a large scale and successfully replaced the traditional vanadium-based SCR catalyst. The application of Cu-SSZ-13 molecular sieve in the fields of direct oxidation of methane to methanol and methanol to low-carbon olefins is under development. Fe-SSZ-13 molecular sieve has high NO under high temperature conditions. x conversion rate, and can also inhibit the generation of N2O. x It has good application prospects in removal and N2O emission control; Zn-SSZ-13 molecular sieve has been proven to have excellent CO2 adsorption capacity and is easy to adsorb and desorb, showing great application potential in the field of CO2 capture.

[0003] At present, M-SSZ-13 molecular sieves containing active metals are mainly prepared in alkali metal systems. Patent CN110078090A discloses a method for preparing Cu-SSZ-13 molecular sieves. The specific preparation process is as follows: (1) Hydrothermal synthesis: synthesize Na-SSZ-13, K-SSZ-13 and other molecular sieves in alkali metal systems such as NaOH and KOH; (2) Ammonium exchange: obtain NH4-SSZ-13 molecular sieves after ammonium exchange, and obtain H-SSZ-13 molecular sieves after calcination; (3) Metal ion exchange: H-SSZ-13 molecular sieves are ion exchanged with divalent Cu salts to obtain Cu-SSZ-13 molecular sieves. The literature (Catalysis Today, 2020, 355: 482-492) reported that Na + and K + This will lead to poor hydrothermal stability of the molecular sieve, thereby affecting its SCR catalytic activity. Therefore, in the preparation process of M-SSZ-13 molecular sieve, multiple ammonium exchanges are required to control the Na + or K + content, and it is difficult to achieve Na + or K +Therefore, it is of great significance to develop a method for preparing M-SSZ-13 molecular sieve in a non-alkali metal system. Patent CN115196651A discloses a method for directly synthesizing Cu-SSZ-13 molecular sieve by using ammonia or small molecular organic amines such as ethylenediamine and diethylamine to replace alkali metals, which can save the ammonium exchange process steps and avoid the introduction of Na + or K + . However, the saturated vapor pressure of ammonia or small molecule organic amines is relatively high. For example, the saturated vapor pressure of ammonia at 130°C in the conventional hydrothermal synthesis temperature range exceeds 10 MPa, while conventional alkali metals themselves do not generate vapor pressure. Therefore, the reaction system using ammonia or small molecule organic amines to replace alkali metals requires extremely high pressure resistance of the hydrothermal synthesis reactor, thereby increasing equipment investment. The literature (Acta Petrolei Sinica (Petroleum Processing), 2019, 35(2): 234-242.) reported the direct synthesis of H-SSZ-13 molecular sieves using quaternary ammonium bases such as tetramethylammonium hydroxide to replace alkali metals. Since tetramethylammonium hydroxide is easily decomposed into trimethylamine and methanol at around 130°C, and since trimethylamine and methanol are volatile organic solvents, their saturated vapor pressure at the hydrothermal synthesis temperature is also relatively high, and there is also the problem of excessive pressure in the reaction system. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a M-SSZ-13 molecular sieve and its preparation method and application, so as to solve the problem that the existing preparation method needs to introduce Na + or K + There are technical problems such as alkali metal ions, high reaction system pressure and high preparation cost.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a method for preparing M-SSZ-13 molecular sieve, comprising the following steps:

[0007] S1: After mixing ionic liquid, water, structure directing agent, aluminum source, silicon source and seed crystal, a crystallization reaction is carried out to obtain a reaction product; the reaction product is dried and calcined in sequence to obtain H-SSZ-13 molecular sieve; S2: The H-SSZ-13 molecular sieve is modified with an active metal M precursor solution to obtain M-SSZ-13 molecular sieve;

[0008] The cations constituting the ionic liquid are alkyl imidazolium cations, and the anions are hydroxide anions or imidazolium anions; the structural formula of the ionic liquid is Wherein, R1 is ethyl, butyl, hexyl or octyl; R2 is methyl; X - OH - or

[0009] Furthermore, in S1, the structure directing agent is N,N,N-trimethyl-1-adamantyl ammonium hydroxide; and the aluminum source is one or both of pseudo-boehmite and aluminum sol.

[0010] Furthermore, in S1, the silicon source is one or both of silica sol or white carbon black; and the seed crystal is one or both of NH4-SSZ-13 molecular sieve seed crystal or H-SSZ-13 seed crystal.

[0011] Furthermore, in S1, when the aluminum source is calculated as Al2O3 and the silicon source is calculated as SiO2, the molar ratio of the ionic liquid, the structure directing agent, the aluminum source, the silicon source and water is (0.15-0.50): (0.05-0.35): (0.03-0.15): 1.00: (15-50); the mass ratio of the seed crystal to SiO2 is 0.01-0.10.

[0012] Furthermore, in S1, the temperature of the crystallization reaction is 135-185° C., and the time is 40-120 h.

[0013] Furthermore, in S2, the usage ratio of the active metal M precursor solution to the H-SSZ-13 molecular sieve is (0.2-15.0) mL: 1 g; and the modification method is one or both of an ion exchange method and an impregnation method.

[0014] Furthermore, in S2, the active metal M precursor solution is composed of a mixture of a soluble salt of the active metal M and deionized water; the concentration of the active metal M precursor solution is 0.05 to 1.25 M; the active metal M is one or more of Cu, Fe, Mn, Ce, Zn, Co, Ni, Pd, Pt or Rh.

[0015] Furthermore, the soluble salt of the active metal M is one or more of nitrate, sulfate, acetate, sulfite and hydrochloride.

[0016] The invention also discloses an M-SSZ-13 molecular sieve prepared by the preparation method.

[0017] The present invention also discloses the application of the M-SSZ-13 molecular sieve. The M-SSZ-13 molecular sieve is used as a catalyst in the process of waste gas treatment, methane to methanol or methanol to olefins.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The invention discloses a method for preparing M-SSZ-13 molecular sieve, which adopts an ionic liquid with advantages of "zero" vapor pressure, good thermal stability, strong structural designability, etc. to provide an alkaline environment required for the growth of molecular sieve grains, and does not introduce Na + or K + , saving the ammonium exchange process steps, and at the same time greatly improving the yield of the molecular sieve without increasing the pressure of the hydrothermal reaction system; in addition, the organic cations of the ionic liquid have a larger size and a lower charge density, and the number of positive charges per unit volume is relatively small, so the amount of AlO4 tetrahedrons (with negative charges) required to balance the charge is reduced accordingly, and the surplus AlO4 tetrahedrons can continue to generate more molecular sieve crystal structures, thereby greatly increasing the yield of the molecular sieve; the preparation method disclosed in the present invention has the advantages of high yield, short process flow, low energy consumption, low cost, and less wastewater generation, and is easy to realize large-scale industrial production.

[0020] The invention also discloses an M-SSZ-13 molecular sieve prepared by the preparation method. Since the M-SSZ-13 molecular sieve does not contain alkali metal ions, the obtained M-SSZ-13 molecular sieve has better catalytic activity and selectivity.

[0021] The present invention also discloses the application of the M-SSZ-13 molecular sieve in waste gas treatment, methane to methanol, and methanol to olefins. During use, since the catalyst does not contain alkali metal ions, it has better hydrothermal stability and service life and better economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the XRD pattern of Na-SSZ-13 molecular sieve;

[0023] Figure 2 The XRD pattern of H-SSZ-13 molecular sieve (Ⅰ) prepared by the present invention;

[0024] Figure 3 This is a comparison chart of SCR catalytic activity of different molecular sieves;

[0025] Where: a-NO x Conversion rate comparison chart; b-N2O generation comparison chart;

[0026] Figure 4 The XRD pattern of H-SSZ-13 molecular sieve (II) prepared by the present invention;

[0027] Figure 5 The XRD pattern of H-SSZ-13 molecular sieve (III) prepared by the present invention;

[0028] Figure 6 This is the XRD diagram of the H-SSZ-13 molecular sieve (IV) prepared in the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0030] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0031] Herein, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0032] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0033] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0034] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0035] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0036] Example 1

[0037] A method for preparing M-SSZ-13 molecular sieve comprises the following steps:

[0038] S1: 1-butyl-3-methylimidazole hydroxide is added to a hydrothermal reaction kettle filled with deionized water, and then N,N,N-trimethyl-1-adamantyl ammonium hydroxide, pseudo-boehmite, and silica sol are added, and 60 g of initial gel is obtained after stirring evenly, and then H-SSZ-13 molecular sieve is added as a seed crystal; wherein the molar ratio of 1-butyl-3-methylimidazole hydroxide, structure directing agent, aluminum source, silicon source and deionized water is 0.25:0.15:0.045:1.00:38, and the mass ratio of seed crystal to SiO2 is 0.05;

[0039] The reactor was heated to 155° C. and kept at this temperature for 96 hours to perform a crystallization reaction to obtain a reaction product, and the reaction product was successively separated, dried, and calcined to obtain H-SSZ-13 molecular sieve (Ⅰ);

[0040] S2: Copper sulfate and deionized water are mixed to obtain a copper sulfate precursor solution with a concentration of 0.5 M. 50.0 mL of the copper sulfate precursor solution and 5.0 g of H-SSZ-13 molecular sieve (I) are mixed, and the H-SSZ-13 molecular sieve (I) is modified by an ion exchange method to obtain a Cu-SSZ-13 molecular sieve.

[0041] Example 2

[0042] A method for preparing M-SSZ-13 molecular sieve comprises the following steps:

[0043] S1: 1-butyl-3-methylimidazolium imidazole salt is added to a hydrothermal reactor filled with deionized water, and then N,N,N-trimethyl-1-adamantyl ammonium hydroxide, pseudo-boehmite, and silica sol are added, and 60 g of initial gel is obtained after stirring evenly, and then NH4-SSZ-13 molecular sieve is added as a seed crystal; wherein the molar ratio of 1-butyl-3-methylimidazolium imidazole salt, structure directing agent, aluminum source, silicon source and deionized water is 0.20:0.11:0.040:1.00:19, and the mass ratio of seed crystal to SiO2 is 0.04;

[0044] The reactor was heated to 175°C and kept at this temperature for 48 hours to perform a crystallization reaction to obtain a reaction product, and the reaction product was successively separated, dried, and calcined to obtain H-SSZ-13 molecular sieve (II);

[0045] S2: Ferrous chloride and deionized water are mixed to obtain a 0.8 M ferrous chloride precursor solution, 25.0 mL of the ferrous chloride precursor solution is mixed with 5.0 g of H-SSZ-13 molecular sieve (II), and the H-SSZ-13 molecular sieve (II) is modified by an ion exchange method to obtain a Fe-SSZ-13 molecular sieve.

[0046] Example 3

[0047] A method for preparing M-SSZ-13 molecular sieve comprises the following steps:

[0048] S1: 1-hexyl-3-methylimidazole hydroxide is added to a hydrothermal reaction kettle filled with deionized water, and then N,N,N-trimethyl-1-adamantyl ammonium hydroxide, pseudo-boehmite, and silica sol are added, and 60 g of initial gel is obtained after stirring evenly, and then H-SSZ-13 molecular sieve is added as a seed crystal; wherein the molar ratio of 1-hexyl-3-methylimidazole hydroxide, structure directing agent, aluminum source, silicon source and deionized water is 0.35:0.15:0.075:1.00:40, and the mass ratio of seed crystal to SiO2 is 0.02;

[0049] The reactor was heated to 150° C. and kept at this temperature for 110 h to perform a crystallization reaction to obtain a reaction product, and the reaction product was sequentially separated, dried, and calcined to obtain H-SSZ-13 molecular sieve (III);

[0050] S2: Pd nitrate is mixed with deionized water to obtain a 0.05 M palladium nitrate precursor solution, 25.0 mL of the palladium nitrate precursor solution is mixed with 5.0 g of H-SSZ-13 molecular sieve (III), and the H-SSZ-13 molecular sieve (III) is modified by an ion exchange method to obtain a Pd-SSZ-13 molecular sieve.

[0051] Example 4

[0052] A method for preparing M-SSZ-13 molecular sieve comprises the following steps:

[0053] S1: 1-butyl-3-methylimidazole hydroxide is added to a hydrothermal reactor filled with deionized water, and then N,N,N-trimethyl-1-adamantyl ammonium hydroxide, aluminum sol, and white carbon are added, and 60 g of initial gel is obtained after stirring evenly, and then H-SSZ-13 molecular sieve is added as a seed crystal; wherein the molar ratio of 1-butyl-3-methylimidazole hydroxide, structure directing agent, aluminum source, silicon source and deionized water is 0.40:0.30:0.110:1.00:45, and the mass ratio of seed crystal to SiO2 is 0.09;

[0054] The reactor was heated to 160° C. and kept at this temperature for 72 hours to perform a crystallization reaction to obtain a reaction product, and the reaction product was successively separated, dried, and calcined to obtain H-SSZ-13 molecular sieve (IV);

[0055] S2: Zinc acetate and deionized water are mixed to obtain a zinc acetate precursor solution with a concentration of 1.0 M. 1.3 mL of the zinc acetate precursor solution and 5.0 g of H-SSZ-13 molecular sieve (IV) are mixed, and the H-SSZ-13 molecular sieve (IV) is modified by an impregnation modification method to obtain a Zn-SSZ-13 molecular sieve.

[0056] Comparative Example 1

[0057] A certain amount of sodium hydroxide is added into a hydrothermal reaction kettle filled with deionized water, and then N,N,N-trimethyl-1-adamantyl ammonium hydroxide, pseudo-boehmite and silica sol are added, and the mixture is stirred evenly to obtain 58 g of initial gel, and then H-SSZ-13 molecular sieve is added as a seed crystal; wherein the molar ratio of sodium hydroxide, structure directing agent, aluminum source, silicon source and deionized water is 0.25:0.15:0.045:1.00:38, and the mass ratio of the seed crystal to SiO2 is 0.05;

[0058] The reactor was heated to 155° C. and kept at this temperature for 96 hours to perform a crystallization reaction to obtain a reaction product. The reaction product was then separated, dried, and calcined in sequence to obtain a Na-SSZ-13 molecular sieve.

[0059] Copper sulfate and deionized water are mixed to obtain a copper sulfate precursor solution with a concentration of 0.5 M. 50.0 mL of the copper sulfate precursor solution and 5.0 g of Na-SSZ-13 molecular sieve are mixed, and the Na-SSZ-13 molecular sieve is modified by an ion exchange method to obtain a Cu-Na-SSZ-13 molecular sieve.

[0060] Figure 1 Shown is the XRD pattern of the Na-SSZ-13 molecular sieve prepared in Comparative Example 1. From the figure, it can be seen that characteristic diffraction peaks of the CHA structure molecular sieve appear at 2θ=9.7°, 13.2°, 14.2°, 16.4°, 17.9°, 21.1°, 25.1° and 31.3°, indicating that the sample is a pure phase Na-SSZ-13 molecular sieve.

[0061] Figure 2 Shown is the XRD pattern of the H-SSZ-13 molecular sieve (Ⅰ) prepared in Example 1. From the figure, it can be seen that the characteristic diffraction peaks of the CHA structure molecular sieve appear at 2θ=9.6°, 13.1°, 14.1°, 16.2°, 17.8°, 20.9°, 25.0° and 31.1°, indicating that the sample is a pure phase H-SSZ-13 molecular sieve.

[0062] The difference between Example 1 and Comparative Example 1 is that in Example 1, only 1-butyl-3-methylimidazole hydroxide is used to replace sodium hydroxide in an equimolar amount, and the other conditions are exactly the same. From the results, the mass of the H-SSZ-13 molecular sieve obtained in Example 1 is 4.3g, while the mass of the Na-SSZ-13 molecular sieve obtained in the comparative example is only 3.1g, and the molecular sieve yield is increased by 38.7%. This is because the 1-butyl-3-methylimidazole cation has a larger size and a lower charge density, and the number of positive charges per unit volume is less, and the amount of AlO4 tetrahedron (with negative charge) needed to balance the charge is reduced accordingly, and the surplus AlO4 tetrahedron can continue to generate more H-SSZ-13 molecular sieve crystal structures, thereby greatly increasing the yield of the molecular sieve.

[0063] The Cu-SSZ-13 molecular sieve prepared in Example 1 and the Cu-Na-SSZ-13 molecular sieve prepared in Comparative Example 1 were tested for SCR catalytic activity under the conditions of NH3=500ppm and NO=500ppm. The results are shown in Figure 3 ,from Figure 3 It can be seen that the NO x The conversion rate is significantly higher than that of Cu-Na-SSZ-13 molecular sieve at T<225℃ and T>450℃; at the same time, the amount of byproduct N2O generated by Cu-SSZ-13 molecular sieve is significantly lower than that of Cu-Na-SSZ-13 molecular sieve. Overall, the SCR catalytic activity and selectivity of Cu-SSZ-13 molecular sieve are significantly better than those of Cu-Na-SSZ-13 molecular sieve. If you want to improve the SCR catalytic activity of Cu-Na-SSZ-13 molecular sieve, you need to remove Na by ammonium exchange from the Na-SSZ-13 molecular sieve prepared by the traditional technical route. + , which leads to a further reduction in the yield of the molecular sieve. The technical route provided by the present invention not only obtains a molecular sieve with high SCR activity, but also improves the yield of the molecular sieve, saves the ammonium exchange process steps, and is easier to achieve industrial production.

[0064] Figure 4 This is the XRD diagram of the H-SSZ-13 molecular sieve (II) prepared in Example 2. From the figure, it can be seen that the characteristic diffraction peaks of the CHA structure molecular sieve appear at 2θ=9.7°, 13.2°, 14.1°, 16.3°, 17.9°, 21.0°, 25.1° and 31.2°, indicating that the sample is a pure phase H-SSZ-13 molecular sieve.

[0065] Figure 5This is the XRD diagram of the H-SSZ-13 molecular sieve (III) prepared in Example 3. From the figure, it can be seen that characteristic diffraction peaks of the CHA structure molecular sieve appear at 2θ=9.6°, 13.0°, 14.0°, 16.2°, 17.8°, 20.9°, 25.0° and 31.0°, indicating that the sample is a pure phase H-SSZ-13 molecular sieve.

[0066] Figure 6 This is the XRD diagram of the H-SSZ-13 molecular sieve (IV) prepared in Example 4. From the figure, it can be seen that the characteristic diffraction peaks of the CHA structure molecular sieve appear at 2θ=9.6°, 13.1°, 14.0°, 16.2°, 17.8°, 20.9°, 25.0° and 31.1°, indicating that the sample is a pure phase H-SSZ-13 molecular sieve.

[0067] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing M-SSZ-13 molecular sieve, characterized in that: The following steps are involved: S1: After mixing the ionic liquid, water, structure directing agent, aluminum source, silicon source and seed crystal, a crystallization reaction is carried out to obtain a reaction product; the reaction product is dried and calcined in sequence to obtain H-SSZ-13 molecular sieve; S2: using an active metal M precursor solution to modify the H-SSZ-13 molecular sieve to obtain the M-SSZ-13 molecular sieve; The cations constituting the ionic liquid are alkyl imidazolium cations, and the anions are hydroxide anions or imidazolium anions; the structural formula of the ionic liquid is Wherein, R1 is ethyl, butyl, hexyl or octyl; R2 is methyl; X - OH - or In S1, the structure directing agent is N,N,N-trimethyl-1-adamantyl ammonium hydroxide; the aluminum source is one or both of pseudo-boehmite and aluminum sol; The silicon source is one or both of silica sol and white carbon black; the seed crystal is one or both of NH4-SSZ-13 molecular sieve seed crystal and H-SSZ-13 molecular sieve seed crystal; When the aluminum source is calculated as Al2O3 and the silicon source is calculated as SiO2, the molar ratio of the ionic liquid, structure directing agent, aluminum source, silicon source and water is (0.15-0.50): (0.05-0.35): (0.03-0.15): 1.00: (15-50); the mass ratio of the seed crystal to SiO2 is 0.01-0.

10.

2. The method for preparing a M-SSZ-13 molecular sieve according to claim 1, characterized in that: In S1, the temperature of the crystallization reaction is 135-185° C., and the time is 40-120 hours.

3. The method for preparing a M-SSZ-13 molecular sieve according to claim 1, characterized in that: In S2, the dosage ratio of the active metal M precursor solution to the H-SSZ-13 molecular sieve is (0.2-15.0) mL: 1 g; the modification method is one or both of the ion exchange method and the impregnation method.

4. The method for preparing a M-SSZ-13 molecular sieve according to claim 1, characterized in that: In S2, the active metal M precursor solution is composed of a mixture of a soluble salt of the active metal M and deionized water; the concentration of the active metal M precursor solution is 0.05-1.25M; the active metal M is one or more of Cu, Fe, Mn, Ce, Zn, Co, Ni, Pd, Pt or Rh.

5. The method for preparing a M-SSZ-13 molecular sieve according to claim 1, characterized in that: The soluble salt of the active metal M is one or more of nitrate, sulfate, acetate, sulfite and hydrochloride.

6. A M-SSZ-13 molecular sieve, characterized in that: The molecular sieve is prepared by the method for preparing an M-SSZ-13 molecular sieve as described in any one of claims 1 to 5.

7. The use of a M-SSZ-13 molecular sieve according to claim 6, characterized in that: The M-SSZ-13 molecular sieve is used as a catalyst in waste gas treatment, methane to methanol or methanol to olefins.

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