A VOCs adsorbing material and a preparation method thereof

Abstract

This invention relates to a VOCs adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, and then modifying it with titanium to obtain a Li-Ti-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.65%–4.2%, and the Ti content is 0.15%–0.85%. The adsorbent material obtained by this invention is a Li-Ti-5A adsorbent material obtained by modification using a 5A molecular sieve as the matrix. This material has advantages such as good adsorption effect on low-carbon hydrocarbons and good thermal stability, especially with better adsorption effect on propane.

Description

Technical Field

[0001] This invention belongs to the field of air pollution control technology, specifically relating to a VOCs adsorption material and its preparation method. Background Technology

[0002] Volatile organic compounds (VOCs) are among the major air pollutants and are important reactants involved in the formation of photochemical smog and haze. Excessive VOCs pose serious threats to human health and the ecological environment. Among the VOCs emitted by the chemical industry, ethane and propane are relatively small molecules with weak polarity, making them often difficult to remove.

[0003] VOCs adsorption and separation technology is suitable for treating low-concentration VOCs waste gas. The key to adsorption purification efficiency lies in the adsorption material. The high specific surface area and suitable pore structure of the adsorption material trap VOCs pollutants through chemical or physical adsorption, thereby purifying the waste gas. VOCs are complex in type, and the larger the molecular weight and the stronger the polarity, the easier they are to be adsorbed. However, low-carbon hydrocarbons, especially ethane and propane, are small VOC molecules with weak polarity, making it difficult for conventional adsorption materials to achieve efficient adsorption.

[0004] CN201410207034.8 discloses an activated carbon propane adsorbent, its preparation method, and its application. The method involves soaking coconut shell activated carbon in a 5-22 mol / L hydrofluoric acid solution, placing it in a hydrothermal reactor, and hydrothermally treating it at 120-180℃ for 1-7 days. After washing and drying, the activated carbon propane adsorbent is obtained. This purification material exhibits high purification efficiency for low concentrations of hydrocarbons. Under conditions of a propane concentration of 20 ppm and a space velocity of 50,000 mL / (g·h), the material achieves a maximum propane purification efficiency of over 99% at room temperature and pressure. However, the adsorption capacity of this material is only 2.0 ml C3H8 / gAC, indicating room for improvement. Furthermore, the temperature rise during the adsorption process poses a risk, hindering safe utilization.

[0005] Among various types of molecular sieves, the effective pore size of the 5A molecular sieve with an LTA structure is approximately 0.51 nm, the kinetic diameter of ethane is 0.4 nm, and the kinetic boundary diameter of propane is approximately 0.43 nm. The pore window size of this molecular sieve conforms to the kinetic sieving of ethane and propane molecules, enabling effective adsorption of ethane and propane molecules into the pore interior. Furthermore, 5A molecular sieves synthesized by traditional methods only possess a microporous channel structure. The slow molecular diffusion rate and long molecular diffusion path within the micropores result in low utilization of the activity within the molecular sieve crystal, significantly limiting the rate of adsorption / desorption processes and consequently limiting the adsorption capacity. For small molecule alkanes in VOCs, such as ethane and propane, due to their weak polarity, adsorption is largely limited to the effects of van der Waals forces, resulting in weak adsorption and poor adsorption performance.

[0006] CN202210619764.3 discloses a method for preparing modified 5A molecular sieve, comprising: 1) fully contacting 5A molecular sieve with sucrose aqueous solution under ultrasonic conditions, and then drying and calcining under an inert gas atmosphere; 2) treating the material obtained in step 1) with ethylene glycol aqueous solution, filtering, and drying; 3) subjecting the material obtained in step 2) to high-temperature hydrothermal activation to obtain the modified 5A molecular sieve. This modified material not only has a high adsorption capacity but also exhibits excellent adsorption and separation effects on n-isoalkanes in the kerosene to diesel fraction. Due to its characteristics, it is suitable for the adsorption of hexane, etc., but its selective adsorption effect on low-carbon hydrocarbons below C4 is poor.

[0007] CN201310516673.8 discloses a 5A molecular sieve adsorbent and its preparation method. This method involves spheroidizing a powder containing a 4A molecular sieve and a binder source, followed by drying and calcination to obtain matrix spheres. The matrix spheres are then pre-wetted, followed by crystallization, calcium exchange, drying, and calcination. This results in a 5A molecular formula adsorbent with advantages such as high adsorption capacity, high adsorption efficiency, and good strength for n-alkanes (e.g., n-hexane). However, the characteristics of this adsorbent make it suitable only for the adsorption of n-hexane, and therefore its adsorption effect on low-carbon hydrocarbons below C4 is poor. Summary of the Invention

[0008] To address the shortcomings of existing adsorption materials, this invention provides a VOCs adsorption material and its preparation method. The adsorption material obtained by the method of this invention is a Li-Ti-5A adsorption material obtained by modification of 5A molecular sieve. This material has advantages such as good adsorption effect on low-carbon hydrocarbons and good thermal stability, especially with better adsorption effect on propane.

[0009] The VOCs adsorption material provided by this invention is a Li-Ti-5A adsorption material obtained by first modifying 5A molecular sieve with lithium and then modifying it with titanium. The content of Li is 0.65% to 4.2% and the content of Ti is 0.15% to 0.85% based on the total mass of the adsorption material.

[0010] In the adsorption material of this invention, micropores account for more than 80%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for more than 65% of the total pore volume.

[0011] In the adsorbent material of this invention, the specific surface area of ​​the Li-Ti-5A adsorbent material is 480–540 m². 2 / g, pore volume 0.26~0.3cm 3 / g.

[0012] The present invention also provides a method for preparing VOCs adsorbent material, comprising the following steps: (1) immersing 5A molecular sieve in lithium salt solution for treatment, and then washing, drying and calcining to obtain Li-5A molecular sieve; (2) immersing Li-5A molecular sieve in titanium salt solution for treatment, and then washing, drying and calcining to obtain Li-Ti-5A adsorbent material.

[0013] In the method of this invention, the 5A molecular sieve in step (1) has the following properties: a specific surface area of ​​400-550 m². 2 / g, preferably 500-550m 2 / g, pore volume 0.2~0.5cm 3 / g, preferably 0.28~0.35cm 3 / g, with an average pore size of 1-3nm and an average particle diameter of 1-3mm. It can be prepared in-house or purchased commercially; in-house preparation is achieved through a hydrothermal method.

[0014] In the method of the present invention, the lithium salt solution in step (1) is at least one of LiCl solution, lithium nitrate solution, lithium sulfate solution, etc., preferably LiCl solution. The concentration of the lithium salt solution is generally 0.25 to 1.8 mol / L, preferably 0.4 to 1.25 mol / L.

[0015] In the method of the present invention, the mass-to-volume ratio of the 5A molecular sieve to the lithium salt solution in step (1) is 1g:3-10mL.

[0016] In the method of the present invention, in step (1), the 5A molecular sieve is immersed in a lithium salt solution at a temperature of 60-90°C, preferably 70-80°C, for a time of 1-5 hours, preferably 1-2 hours.

[0017] In the method of this invention, the washing in step (1) is performed using conventional methods in the art, such as rinsing with deionized water until no lithium ions are detected. The drying conditions are: drying temperature 70-120℃, preferably 80-100℃, drying time 2-10h, preferably 2-5h. The calcination conditions are: calcination temperature 450-600℃, preferably 500-550℃, calcination time 1-10h, preferably 2-6h.

[0018] In the method of this invention, the titanium salt in step (2) is a soluble titanium salt, specifically at least one of titanium tetrachloride, titanium oxysulfate, and titanium oxalate, preferably titanium tetrachloride. The titanium content in the titanium salt solution is generally 0.03 to 0.4 mol / L, preferably 0.15 to 0.25 mol / L.

[0019] In the method of the present invention, the mass-to-volume ratio of Li-5A molecular sieve to titanium salt solution in step (2) is 1g:10-20mL.

[0020] In the method of the present invention, in step (2), Li-5A molecular sieve is immersed in titanium salt solution for treatment at room temperature, preferably 15-30°C, for a time of 1-5 hours, preferably 1-2 hours.

[0021] In the method of this invention, the washing in step (2) is performed using conventional methods in the art, such as rinsing with deionized water until no titanium ions are detected. The drying conditions are: drying temperature 70-120℃, preferably 80-100℃, drying time 2-10h, preferably 2-5h. The calcination conditions are: calcination temperature 450-600℃, preferably 500-550℃, calcination time 1-10h, preferably 2-6h.

[0022] The Li-Ti-5A adsorbent material described in this invention is used for the adsorption and separation of low-carbon hydrocarbons in VOCs.

[0023] In this invention, the low-carbon hydrocarbons in VOCs are mainly C2-C4 low-carbon hydrocarbons, specifically ethane, propane, etc., preferably propane. The concentration of low-carbon hydrocarbons in VOCs is 100-1000 mg / m³. 3 .

[0024] In this invention, the adsorption conditions are as follows: the adsorption bed temperature is room temperature, preferably 15–32°C; the bed pressure is atmospheric pressure; and the space velocity is 100–500 h⁻¹. -1 .

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) In this invention, 5A molecular sieve is first modified with lithium salt solution, and then modified with titanium salt to obtain a two-component modified Li-Ti-5A adsorbent material. Through the cooperation between the substances and the two-step modification, most of the pore sizes in the adsorbent material are between 0.4 and 0.6 nm, which is conducive to the type-selective adsorption of low carbon hydrocarbons. In particular, most of the molecular dynamics are closer to propane, around 0.43 nm, which effectively enhances the adsorption capacity of 5A molecular sieve for propane.

[0027] (2) By using metal Li ions to regulate the pore structure of molecular sieves, not only can the pore size be close to the molecular dynamics size of small molecule VOCs, but the surface charge can also be changed, thereby enhancing the adsorption capacity of small molecule VOCs.

[0028] (3) Using Ti, which has a similar atomic size, to replace Ca in the 5A molecular sieve framework can increase the surface acidity and the adsorption of low-carbon hydrocarbons without affecting the pore structure. At the same time, it can increase the surface polarity of the material and enhance the Coulomb field adsorption effect in the pore structure of the molecular sieve, which helps to improve the adsorption performance of low-carbon hydrocarbons. Detailed Implementation

[0029] The following embodiments further illustrate the technical solution and effects of the present invention. These embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0030] Unless otherwise specified, the experimental methods used in the following examples are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following examples were purchased from conventional biochemical reagent stores.

[0031] The specific surface area and pore volume involved in the embodiments of this invention were obtained by analyzing the adsorption-desorption curves using an N2 adsorption analyzer. The Li and Ti contents in the material were obtained by ICP-OES analysis. The adsorption capacity of the material for ethane and propane was obtained by testing with a gas dynamic adsorption analyzer.

[0032] Example 1

[0033] Commercially purchased 5A molecular sieve has the following properties: specific surface area: 540 m² 2 / g, pore volume: 0.34cm 3 / g, average pore size: 2.15nm, average particle diameter: 2.8mm. The modification process is as follows:

[0034] (1) The 5A molecular sieve was immersed in a LiCl solution with a concentration of 1 mol / L. The mass-volume ratio of 5A molecular sieve to lithium salt solution was 1 g: 7 mL. The solution was treated at 75°C for 1 hour. After being removed, it was washed with deionized water, dried at 100°C for 4 hours, and calcined at 500°C for 6 hours to obtain Li-5A molecular sieve.

[0035] (2) The Li-5A molecular sieve was immersed in a titanium tetrachloride solution with a titanium content of 0.2 mol / L. The mass-volume ratio of Li-5A molecular sieve to titanium tetrachloride solution was 1 g: 15 mL. The solution was treated at 20 °C for 2 h. After removal, it was washed with deionized water, dried at 100 °C for 4 h, and calcined at 500 °C for 5 h to obtain Li-Ti-5A adsorbent material.

[0036] The prepared Li-Ti-5A adsorbent material, by total mass, contains 3.29% Li and 0.56% Ti, with a specific surface area of ​​512 m². 2 / g, pore volume is 0.28cm 3 / g, of which micropores account for more than 85.5%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 70.2% of the total pore volume.

[0037] Example 2

[0038] Commercially purchased 5A molecular sieve has the following properties: specific surface area: 508 m² 2 / g, pore volume: 0.28cm 3 / g, average pore size: 2.2nm, average particle diameter: 2.65mm. The modification process is as follows:

[0039] (1) The 5A molecular sieve was immersed in a LiCl solution with a concentration of 0.25 mol / L. The mass-volume ratio of 5A molecular sieve to lithium salt solution was 1 g: 10 mL. The solution was treated at 60 °C for 2 hours. After being removed, it was washed with deionized water, dried at 80 °C for 8 hours, and calcined at 600 °C for 2 hours to obtain Li-5A molecular sieve.

[0040] (2) The Li-5A molecular sieve was immersed in a titanium tetrachloride solution with a titanium content of 0.4 mol / L. The mass-volume ratio of Li-5A molecular sieve to titanium tetrachloride solution was 1 g: 10 mL. The solution was treated at 25 °C for 4 h. After removal, it was washed with deionized water, dried at 110 °C for 2 h, and calcined at 600 °C for 2 h to obtain Li-Ti-5A adsorbent material.

[0041] The prepared Li-Ti-5A adsorbent material, by total mass, contains 0.67% Li and 0.83% Ti, with a specific surface area of ​​485 m². 2 / g, pore volume is 0.26cm 3 / g, of which micropores account for 81.2%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 66.7% of the total pore volume.

[0042] Example 3

[0043] Commercially purchased 5A molecular sieve has the following properties: specific surface area: 550 m² / g. 2 / g, pore volume: 0.35cm 3 / g, average pore size: 2.18nm, average particle diameter: 2.7mm. The modification process is as follows:

[0044] (1) The 5A molecular sieve was immersed in a LiCl solution with a concentration of 1.8 mol / L. The mass-volume ratio of 5A molecular sieve to lithium salt solution was 1 g: 3 mL. The solution was treated at 90 °C for 1.5 hours. After being removed, it was washed with deionized water, dried at 120 °C for 2 hours, and calcined at 450 °C for 8 hours to obtain Li-5A molecular sieve.

[0045] (2) The Li-5A molecular sieve was immersed in a titanium tetrachloride solution with a titanium content of 0.03 mol / L. The mass-volume ratio of Li-5A molecular sieve to titanium tetrachloride solution was 1 g: 20 mL. The solution was treated at 20 °C for 5 h. After removal, it was washed with deionized water, dried at 120 °C for 3 h, and calcined at 450 °C for 8 h to obtain Li-Ti-5A adsorbent material.

[0046] The prepared Li-Ti-5A adsorbent material, by total mass, contains 4.14% Li and 0.17% Ti, with a specific surface area of ​​535 m². 2 / g, pore volume is 0.29cm 3 / g, of which micropores account for 87.4%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 73.5% of the total pore volume.

[0047] Example 4

[0048] Similar to Example 1, except that lithium sulfate was used as the lithium salt. In the prepared Li-Ti-5A adsorbent material, the Li content was 2.93% and the Ti content was 0.63% by total mass, with a specific surface area of ​​503 m². 2 / g, pore volume 0.27cm 3 / g, of which micropores account for 83.1%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 68.4% of the total pore volume.

[0049] Example 5

[0050] Similar to Example 1, except that lithium nitrate was used as the lithium salt. In the prepared Li-Ti-5A adsorbent material, the Li content was 3.42% and the Ti content was 0.49% by total mass, with a specific surface area of ​​528 m². 2 / g, pore volume is 0.29cm 3 / g, of which micropores account for 87.4%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 72.8% of the total pore volume.

[0051] Example 6

[0052] Similar to Example 1, except that titanium oxysulfate was used as the titanium salt. In the prepared Li-Ti-5A adsorbent material, the Li content was 3.31% and the Ti content was 0.53% by total mass, with a specific surface area of ​​522 m². 2 / g, pore volume is 0.29cm 3 / g, of which micropores account for 86.2%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 71.5% of the total pore volume.

[0053] Example 7

[0054] Similar to Example 1, except that titanium oxalate was used as the titanium salt. In the prepared Li-Ti-5A adsorbent material, the Li content was 3.18% and the Ti content was 0.64% by total mass, with a specific surface area of ​​505 m². 2 / g, pore volume 0.27cm 3 / g, of which micropores account for 83.4%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 69.4% of the total pore volume.

[0055] Comparative Example 1

[0056] Same as Example 1, except that only step (1) is performed to obtain Li-5A material, wherein the Li content is 3.25% and the specific surface area is 520 m². 2 / g, pore volume 0.29 cm³ 3 / g. Of which, micropores account for 76.8%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 67.2% of the total pore volume.

[0057] Comparative Example 2

[0058] Same as Example 1, except that only step (2) is performed to obtain Ti-5A molecular sieve material, wherein the Ti content is 0.61% and the specific surface area is 485 m². 2 / g, pore volume 0.26 cm³ 3 / g. Of which, micropores account for 69.4%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 60.1% of the total pore volume.

[0059] Comparative Example 3

[0060] Similar to Example 1, except that titanium salt was used for treatment first, followed by lithium salt treatment. The prepared Li-Ti-5A adsorbent material, by total mass, contained 0.51% Li and 1.16% Ti, with a specific surface area of ​​336 m². 2 / g, pore volume is 0.21cm 3 / g, of which micropores account for 61.5%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 50.7% of the total pore volume.

[0061] Comparative Example 4

[0062] Similar to Example 1, except that the lithium salt treatment temperature was room temperature, i.e., 25 degrees Celsius. The prepared Li-Ti-5A adsorbent material, by total mass, contained 0.19% Li and 1.46% Ti, with a specific surface area of ​​308 m². 2 / g, pore volume 0.19cm 3 / g, of which micropores account for 57.2%, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounts for 49.4% of the total pore volume.

[0063] Comparative Example 5

[0064] Similar to Example 1, except that manganese salt is used instead of titanium salt. In the prepared adsorbent material, the content of Li is 0.21% and the content of Mn is 1.62% by total mass, with a specific surface area of ​​329 m². 2 / g, pore volume is 0.23cm 3 / g, of which micropores account for 59.2%, and the sum of the volumes of pores with pore sizes between 4 and 6 Å accounts for 49.7% of the total pore volume.

[0065] Test Example 1

[0066] The adsorption capacities of the adsorbents prepared in Examples 1-7 and Comparative Examples 1-5 for ethane, propane, and other organic compounds were tested. Under normal temperature and pressure conditions, the adsorption volume space velocity was 500 h⁻¹. -1 The concentration of propane in the gas mixture is 200 mg / m³. 3 The concentration of ethane is 100 mg / m³. 3 The concentration of butane is 100 mg / m³. 3 The concentration of n-hexane is 100 mg / m³. 3 The concentration of benzene is 100 mg / m³. 3 After adsorption reached saturation, the detection results are shown in Table 1.

[0067] Table 1. Test results of different embodiments and comparative examples

[0068]

[0069] The specific embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An adsorption material for the adsorption and separation of low-carbon hydrocarbons in VOCs, characterized in that: The Li-Ti-5A adsorbent material was obtained by first modifying 5A molecular sieve with lithium and then modifying it with titanium. The content of Li was 0.65% to 4.2% and the content of Ti was 0.15% to 0.85% by the total mass of the adsorbent material. Micropores accounted for more than 80% of the adsorbent material, and the sum of the volumes of pores with a pore size between 4 and 6 Å accounted for more than 65% of the total pore volume. The preparation method of the adsorbent material includes the following steps: (1) immersing 5A molecular sieve in lithium salt solution at a temperature of 60-90℃, and then washing, drying and calcining to obtain Li-5A molecular sieve; (2) immersing Li-5A molecular sieve in titanium salt solution, and then washing, drying and calcining to obtain Li-Ti-5A adsorbent material.

2. The adsorbent material according to claim 1, characterized in that: The specific surface area of ​​the Li-Ti-5A adsorbent is 480–540 m². 2 / g, pore volume 0.26~0.3cm 3 / g.

3. The adsorbent material according to claim 1, characterized in that: The 5A molecular sieve in step (1) has the following properties: specific surface area of ​​400-550 m². 2 / g, pore volume 0.2~0.5cm 3 / g, with an average pore size of 1-3nm and an average particle diameter of 1-3mm.

4. The adsorbent material according to claim 3, characterized in that: In step (1), the specific surface area of ​​the 5A molecular sieve is 500–550 m². 2 / g, pore volume 0.28~0.35cm³ 3 / g.

5. The adsorbent material according to claim 1, characterized in that: In step (1), the lithium salt solution is at least one of LiCl solution, lithium nitrate solution, and lithium sulfate solution.

6. The adsorbent material according to claim 5, characterized in that: In step (1), the lithium salt solution is a LiCl solution.

7. The adsorbent material according to claim 1, 5, or 6, characterized in that: The concentration of the lithium salt solution in step (1) is 0.25 to 1.8 mol / L.

8. The adsorbent material according to claim 7, characterized in that: The concentration of the lithium salt solution in step (1) is 0.4 to 1.25 mol / L.

9. The adsorbent material according to claim 1, 5, or 6, characterized in that: The mass-to-volume ratio of the 5A molecular sieve to the lithium salt solution in step (1) is 1g:3-10mL.

10. The adsorbent material according to claim 1, characterized in that: In step (1), the 5A molecular sieve is immersed in a lithium salt solution at a temperature of 70-80°C for 1-5 hours.

11. The adsorbent material according to claim 1, characterized in that: In step (1), the washing is done with deionized water until no lithium ions are detected; the drying conditions are: drying temperature 70-120℃, drying time 2-10h; the calcination conditions are: calcination temperature 450-600℃, calcination time 1-10h.

12. The adsorbent material according to claim 11, characterized in that: The drying temperature is 80-100℃ and the drying time is 2-5 hours; the calcination temperature is 500-550℃ and the calcination time is 2-6 hours.

13. The adsorbent material according to claim 1, characterized in that: In step (2), the titanium salt is a soluble titanium salt.

14. The adsorbent material according to claim 13, characterized in that: In step (2), the titanium salt is at least one of titanium tetrachloride, titanium oxysulfate, and titanium oxalate.

15. The adsorbent material according to claim 14, characterized in that: In step (2), the titanium salt is titanium tetrachloride.

16. The adsorbent material according to claim 1 or 13, characterized in that: In step (2), the titanium content in the titanium salt solution is 0.03 to 0.4 mol / L.

17. The adsorbent material according to claim 16, characterized in that: In step (2), the titanium content in the titanium salt solution is 0.15 to 0.25 mol / L.

18. The adsorbent material according to claim 1 or 13, characterized in that: The mass-to-volume ratio of Li-5A molecular sieve to titanium salt solution in step (2) is 1g:10-20mL.

19. The adsorbent material according to claim 1, characterized in that: In step (2), the Li-5A molecular sieve is immersed in a titanium salt solution at room temperature for 1 to 5 hours.

20. The adsorbent material according to claim 19, characterized in that: In step (2), the Li-5A molecular sieve is immersed in a titanium salt solution at a temperature of 15-30°C for 1-2 hours.

21. The adsorbent material according to claim 1, characterized in that: In step (2), deionized water is used for washing until no titanium ions are detected. The drying conditions are: drying temperature 70-120℃, drying time 2-10h. The calcination conditions are: calcination temperature 450-600℃, calcination time 1-10h.

22. The adsorbent material according to claim 21, characterized in that: The drying temperature is 80-100℃ and the drying time is 2-5 hours; the calcination temperature is 500-550℃ and the calcination time is 2-6 hours.

23. The application of the adsorbent material according to any one of claims 1-22, characterized in that: Used for the adsorption and separation of low-carbon hydrocarbons in VOCs.

24. The application according to claim 23, characterized in that: Low-carbon hydrocarbons in VOCs are C2-C4 low-carbon hydrocarbons.

25. The application according to claim 24, characterized in that: The low-carbon hydrocarbons in VOCs are ethane and propane.

26. The application according to claim 25, characterized in that: Propane is the lowest carbon hydrocarbon among VOCs.

27. The application according to claim 23 or 24, characterized in that: The concentration of low-carbon hydrocarbons in VOCs is 100–1000 mg / m³. 3 .

28. The application according to claim 23, characterized in that: The adsorption conditions are as follows: adsorption bed temperature is 15–32℃, bed pressure is atmospheric pressure, and space velocity is 100–500 h⁻¹. -1 .

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