Aerogel catalyst and its preparation method and application

Abstract

The present application relates to an aerogel catalyst and a preparation method and application thereof. The aerogel catalyst comprises a ceramic aerogel carrier and cerium oxide loaded on the carrier. The present application can effectively increase the loading amount of cerium oxide on the ceramic aerogel carrier by introducing a suitable organic ligand, and obtain an aerogel catalyst with good dispersity, high catalytic activity, good stability and high recovery rate, especially excellent degradation effect on volatile organic compounds.

Description

Technical Field

[0001] The present invention relates to the technical field of catalysts, in particular to an aerogel catalyst and a preparation method and application thereof, and in particular to a cerium oxide ceramic aerogel catalyst and a preparation method and application thereof. Background Art

[0002] VOCs are a general term for volatile organic compounds with a melting point below room temperature and a boiling point between 50°C and 260°C. VOC emissions are a problem in industries such as automobile exhaust, oil smoke, pharmaceutical chemicals, and hydrometallurgy. VOCs can cause smog, participate in photochemical reactions, lead to atmospheric photochemical pollution, increase oxygen concentrations, and pose serious risks to plant and animal growth and the atmospheric environment. They also affect human respiration, irritate the skin and eyes, affect the nervous system, and are carcinogenic, teratogenic, and mutagenic. VOC purification technologies include adsorption, absorption, membrane separation, condensation, catalytic combustion, thermal incineration, biotechnology, plasma destruction, and photocatalysis. Adsorption methods are difficult to regenerate adsorbents and fail to destroy VOCs. Absorption methods are difficult to select and difficult to recycle. Condensation methods are costly, membrane separation methods require high-pressure treatment and are slow. Biodegradation methods have poor degradation effects and long reaction times. Thermal combustion methods are costly and consume a lot of fuel. Plasma catalysis methods have poor selectivity and are technically challenging. Photocatalysis methods suffer from low photo-Fenton catalytic efficiency, difficult to control Fenton reaction conditions, and catalyst deactivation. In summary, thermal catalytic oxidation has high efficiency, simple equipment and can work at lower temperatures. How to treat VOCs generated in industrial production processes with low cost and high efficiency, how to load the catalyst on aerogel and achieve VOCs emission standards (≤100mg / m 3 ), remains a key issue to be resolved.

[0003] Nanomaterials, as a new generation of highly efficient and environmentally friendly catalysts, have promising applications in air purification, including photocatalytic air purification, automobile exhaust purification, fossil fuel desulfurization, and greenhouse gas reduction. They are hailed as "promising materials of the 21st century." Nanoinorganic oxides are a key component of nanomaterials, and rare earth oxides are a particular highlight. Among these rare earth oxides, nanoceria is a highly active oxide catalyst. This is due to the small particle size of ceria nanoparticles (CeO2 NPs), resulting in surface bonding and electronic states that differ from those within the particle interior. This poor surface smoothness creates uneven atomic steps, which increase the reactive contact surface and contribute to their strong catalytic performance. The high oxygen vacancies in CeO2 NPs are exploited to synergize with precious metal platinum for the catalytic oxidation of VOCs, converting them directly into harmless carbon dioxide. However, due to the small size and large specific surface area of ​​nanomaterials, the increased number of surface atoms, insufficient atomic coordination, and high surface energy, these surface atoms are highly active but also extremely unstable, prone to agglomeration, and thus reduce catalytic activity. Furthermore, the recyclability of the catalyst significantly reduces costs. For nanomaterials, centrifugal separation is currently often used. During the separation process, energy consumption is high and the effect is poor. Summary of the Invention

[0004] In order to solve one of the above problems in the prior art, the present invention provides an aerogel catalyst and a preparation method thereof. The present invention uses ceramic aerogel as a carrier and adopts a ligand method to load cerium oxide onto the ceramic aerogel, which can effectively increase the cerium oxide loading amount. The method of the present invention can also use photocatalytic reduction technology to load precious metals in situ on the cerium oxide ceramic aerogel catalyst, thereby improving the dispersibility and stability of the precious metals. Through the synergistic catalytic effect between cerium oxide and precious metals, the performance of degrading volatile organic compounds under low temperature conditions is improved, and the degradation temperature of volatile organic pollutants in atmospheric pollutants is effectively reduced. At the same time, the catalyst has high activity, low precious metal usage, and low catalyst cost, providing technical support for the efficient, rapid, low-energy, and low-cost treatment of volatile organic pollutants.

[0005] A first aspect of the present invention provides an aerogel catalyst comprising a ceramic aerogel carrier, and cerium oxide and an optional noble metal supported on the carrier.

[0006] Unless otherwise specified, the "cerium oxide" and "cerium dioxide" mentioned in the present invention refer to the same compound with the chemical formula CeO2.

[0007] The term "optional" used in the present invention means that the substance exists or does not exist. For example, "optional noble metal" means that noble metal exists in the catalyst or does not exist in the catalyst.

[0008] In some embodiments, the aerogel catalyst includes a ceramic aerogel support and cerium oxide supported on the ceramic aerogel support.

[0009] In some embodiments, the aerogel catalyst includes a ceramic aerogel support, and cerium oxide and a noble metal supported on the ceramic aerogel support.

[0010] In some embodiments, the ceramic aerogel carrier is a SiO2 / Al2O3 ceramic fiber aerogel. In some specific embodiments, the diameter of the SiO2 / Al2O3 ceramic fiber is 100-500 nm.

[0011] In some embodiments, the porosity of the SiO2 / Al2O3 ceramic fiber aerogel is 93%-98%.

[0012] In some embodiments, the method for preparing the SiO2 / Al2O3 ceramic fiber aerogel comprises the following steps:

[0013] PVA is mixed with water and heated under reflux to obtain a mixed solution; aluminum salt, silane reagent and alcohol solvent are added to the mixed solution, and fiber filaments are obtained through spinning technology; and the fiber filaments are calcined to obtain SiO2 / Al2O3 ceramic fiber aerogel.

[0014] In some embodiments, the heating reflux temperature is 100° C.-300° C., and the heating reflux time is 1-3 hours.

[0015] In some embodiments, the aluminum salt is selected from one or more of aluminum chloride, aluminum nitrate, and aluminum sulfate.

[0016] In some embodiments, the silane reagent is tetraethoxysilane.

[0017] In some embodiments, the mass volume ratio of the aluminum salt to the silane reagent is (0.5-3.0):1 g / mL.

[0018] In some embodiments, the calcination temperature is 500° C.-1800° C., and the calcination time is 2-5 hours.

[0019] In some embodiments, the cerium oxide is nano-sized cerium dioxide. Preferably, the average particle size of the cerium oxide is 1-100 nanometers, preferably 1-30 nanometers.

[0020] In some embodiments, the noble metal is selected from one or more of platinum, palladium, rhodium, ruthenium, osmium, iridium and gold. In some embodiments, the noble metal is platinum.

[0021] In some embodiments, the average particle size of the noble metal is 1-100 nanometers, preferably 1-30 nanometers.

[0022] In some embodiments, the loading amount of cerium dioxide in the aerogel catalyst is 10 wt%-30 wt%, for example, 12 wt%, 15 wt%, 18 wt%, 20 wt%, 22 wt%, 25 wt%, 28 wt% or 30 wt%, preferably 15 wt%-25 wt%, more preferably 15 wt%-20 wt%.

[0023] In some embodiments, the loading amount of the precious metal in the aerogel catalyst is 0-0.5wt%, for example, 0, 0.01wt%, 0.03wt%, 0.05wt%, 0.08wt%, 0.1wt%, 0.15wt%, 0.2wt%, 0.25wt%, 0.3wt%, 0.35wt%, 0.4wt%, 0.45wt% or 0.5wt%, preferably 0.01wt%-0.1wt%.

[0024] The second aspect of the present invention provides a method for preparing the aerogel catalyst described in the first aspect, comprising:

[0025] (1) The ceramic aerogel carrier is immersed in a cerium salt solution,

[0026] (2) Drying and sintering the impregnated ceramic aerogel carrier to obtain a cerium oxide ceramic aerogel catalyst.

[0027] In some embodiments, the cerium salt solution comprises a cerium salt, a ligand, and water. In some embodiments, the ligand is selected from one or more of an organic acid, an alcohol, an amine, and a nitrile. In some embodiments, the ligand is selected from at least one of phthalic acid, acetic acid, ethylene glycol, triethylamine, ethylenediaminetetraacetic acid, citric acid, methanol, and acetonitrile.

[0028] The present invention adopts the ligand method to load cerium oxide, introduces organic ligands containing carboxyl, hydroxyl, amino or cyano groups, which can greatly increase the loading amount of cerium oxide on the ceramic aerogel carrier and obtain a cerium oxide ceramic aerogel catalyst with higher catalytic activity.

[0029] In some embodiments, the mass concentration of the ligand in the cerium salt solution is 10-80 wt %. In some embodiments, the mass concentration of the ligand is 30-50 wt %.

[0030] In some embodiments, the molar ratio of the cerium salt to the ligand is 1:(3-20), such as 1:3, 1:5, 1:8, 1:10, 1:12, 1:15, 1:18, 1:20, or any value therebetween. In some embodiments, the molar ratio of the cerium salt to the ligand is 1:(3-10). In some embodiments, the molar ratio of the cerium salt to the ligand is 1:(5-8).

[0031] In some embodiments, the cerium salt includes one or more of cerium nitrate, cerium chloride, and cerium carbonate.

[0032] In some embodiments, the solvent in the ligand solution is water.

[0033] In some embodiments, the immersion time is 5-50 min, preferably 25-35 min.

[0034] In some embodiments, in step (2), the sintering temperature is 400°C-600°C, preferably 450°C-550°C.

[0035] In some embodiments, in step (2), the sintering time is 1-8 hours, preferably 2-5 hours.

[0036] In some embodiments, the carrier is SiO2 / Al2O3 ceramic fiber aerogel. In some embodiments, the preparation method of the SiO2 / Al2O3 ceramic fiber aerogel comprises the following steps:

[0037] PVA is mixed with water and heated under reflux to obtain a mixed solution; aluminum salt, silane reagent and alcohol solvent are added to the mixed solution, and fiber filaments are obtained through spinning technology; and the fiber filaments are calcined to obtain SiO2 / Al2O3 ceramic fiber aerogel.

[0038] In some embodiments, the heating reflux temperature is 100° C.-300° C., and the heating reflux time is 1-3 hours.

[0039] In some embodiments, the aluminum salt is selected from one or more of aluminum chloride, aluminum nitrate, and aluminum sulfate.

[0040] In some embodiments, the silane reagent is tetraethoxysilane.

[0041] In some embodiments, the mass volume ratio of the aluminum salt to the silane reagent is (0.5-3):1 g / mL.

[0042] In some embodiments, the fiber filaments have a diameter of 100-500 nm.

[0043] In some embodiments, the calcination temperature is 500° C.-1800° C., and the calcination time is 2-5 hours.

[0044] In some embodiments, the preparation method further includes the step of loading a precious metal on the cerium oxide ceramic aerogel catalyst: impregnating the cerium oxide ceramic aerogel catalyst obtained in the above step (2) into a precious metal salt solution, and loading the precious metal on the cerium oxide ceramic aerogel catalyst by an in-situ reduction method to obtain a precious metal / cerium oxide ceramic aerogel catalyst.

[0045] In some embodiments, the noble metal salt is selected from one or more of chlorides, sulfates, and nitrates of noble metals such as platinum, palladium, ruthenium, osmium, iridium, and gold.

[0046] In some embodiments, the noble metal salt is selected from at least one of chloroplatinic acid, platinum chloride, platinum nitrate, palladium chloride, ruthenium trichloride and chloroauric acid.

[0047] In some embodiments, the immersion time is 5-50 min. In some embodiments, the immersion time is 25-35 min.

[0048] In some embodiments, the in-situ reduction method is a light irradiation in-situ reduction method, for example, reducing the precious metal by irradiation with a xenon lamp light source. In some embodiments, the light irradiation time is 1-8 hours.

[0049] The third aspect of the present invention provides the use of the aerogel catalyst described in the first aspect of the present invention or the aerogel catalyst obtained by the preparation method described in the second aspect in catalytic degradation of VOCs.

[0050] The VOCs (volatile organic compounds) described herein include, but are not limited to, alkanes (straight-chain alkanes and cycloalkanes), alkenes, alkynes, benzene series, alcohols, aldehydes, ethers, ketones, acids, esters, halogenated hydrocarbons, and the like. In some embodiments, the VOCs include at least one of benzene, toluene, xylene, formaldehyde, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanates, and diisocyanatotoluene.

[0051] In some embodiments, the use comprises reacting VOCs with the aerogel catalyst and air under heating conditions.

[0052] In some embodiments, the initial concentration of volatile organic compounds is 1.0-1000 ppm, preferably 1.0-100 ppm.

[0053] In some embodiments, the amount of the aerogel catalyst is 0.5-10 g, preferably 1-3 g.

[0054] In some embodiments, the flow rate of the volatile organic compounds is 10-100 L / min, preferably 50-70 L / min.

[0055] In some embodiments, the ratio of the volatile organic compound flow rate to the air flow rate is 1:(0.2-10), preferably 1:1-1:5.

[0056] In some embodiments, the reaction is carried out at a temperature of 0-500°C, preferably 100-200°C.

[0057] In some embodiments, the reaction time is 0.1 seconds to 10 seconds, preferably 0.2 seconds to 5 seconds, and more preferably 0.2 to 0.5 seconds.

[0058] In some embodiments, the reaction further comprises a reducing agent. In some specific embodiments, the reducing agent is selected from at least one of triethanolamine, methanol, and ethanol. In some specific embodiments, the mass ratio of the noble metal to the reducing agent is (0.01-0.5):1.

[0059] Compared with the prior art, the present invention has the following beneficial technical effects:

[0060] 1. The present invention loads cerium oxide on ceramic aerogel, especially selects specific organic ligands, and loads CeO2 on ceramic aerogel through a ligand method, which can effectively increase the CeO2 loading on the ceramic aerogel and realize the preparation of high-load cerium oxide ceramic aerogel.

[0061] 2. Through photocatalytic reduction technology, precious metals are loaded onto cerium oxide ceramic aerogels to prepare precious metal-cerium oxide ceramic aerogel catalysts, which improves the dispersibility of precious metal catalysts and reduces the amount of precious metals used. Through the synergistic catalytic effect between precious metals and cerium oxide, high-throughput, rapid, and efficient catalytic degradation of volatile organic pollutants in the atmosphere is achieved under low-temperature conditions.

[0062] 3. The noble metal-cerium oxide ceramic aerogel catalyst of the present invention can convert VOCs into pollution-free CO2. The VOCs content in the tail gas after treatment can meet the requirements of the "Integrated Emission Standard of Air Pollutants" GB 3095-2012 (≤100mg / m 3 ) requirements, and the catalyst can be used continuously for 100 days and recycled for more than 20 times without reducing its catalytic activity.

[0063] 4. The aerogel catalyst of the present invention has a wide range of applications and can be used to catalyze pollutants including automobile exhaust, CO, NO and benzene homologues. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1This is a scanning electron microscope image of the SiO2 / Al2O3 ceramic fiber prepared in step (1) of Example 1.

[0065] Figure 2 These are the transmission electron microscopy images and energy spectrum analysis images of the Pt / cerium oxide ceramic aerogel catalyst prepared in Example 1, wherein Figure (a) is a transmission electron microscopy image, and Figure (b) is an energy spectrum analysis image. DETAILED DESCRIPTION

[0066] The present invention will be described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0067] Example 1

[0068] (1) Preparation of SiO2 / Al2O3 ceramic fiber aerogel: Prepare 500 mL of 1.0 wt% PVA aqueous solution, heat and reflux at 150°C until dissolved. Then add 30 g of aluminum chloride or aluminum nitrate to the mixture and stir until dissolved. Then add 50 mL of TEOS (tetraethoxysilane), 50 mL of n-butanol and 10 mL of ethanol, stir until dissolved, spin to obtain fiber filaments, sinter at 500°C-1800°C for 3 hours, and obtain SiO2 / Al2O3 ceramic fiber aerogel with a diameter of 100-500 nm (Scanning electron microscope image as shown in Figure 2). Figure 1 shown).

[0069] (2) Ligand-loaded cerium oxide: Prepare 500 mL of ethylene glycol aqueous solution (20 wt %) as the ligand solution, add 30 g of cerium salt, and stir until dissolved. Immerse the ceramic aerogel in this solution for 10 min, dry at room temperature, and sinter in a muffle furnace. Sinter the mixture at a rate of 5°C / min to 500°C and sinter for 5 h to obtain a cerium oxide ceramic aerogel with a cerium oxide loading of 21.8 wt %.

[0070] (3) Preparation of precious metal / cerium oxide ceramic aerogel catalyst by photocatalytic reduction: a 0.2% mass concentration of chloroplatinic acid aqueous solution was prepared, irradiated with a xenon lamp light source for 3 hours, and dried at room temperature to obtain a Pt / cerium oxide ceramic aerogel catalyst. The Pt morphology was spherical particles with a loading of 0.05 wt%.

[0071] Transmission electron microscopy and energy spectrum analysis of the above Pt / cerium oxide ceramic aerogel catalyst are as follows Figure 2 As shown in the transmission electron microscope image in Figure (a), CeO2 and precious metal Pt are uniformly loaded on the surface of SiO2 / Al2O3 ceramic fiber aerogel; the energy spectrum analysis in Figure (b) shows that there are a large number of Ce, Pt and O elements on the ceramic aerogel, further proving that CeO2 and precious metal Pt are successfully loaded on the surface of the ceramic aerogel.

[0072] Example 2-Example 8

[0073] The only difference from Example 1 is that the ligand in step (2) is different. The cerium oxide loading in the obtained cerium oxide ceramic aerogel is as shown in Table 1.

[0074] Table 1

[0075] Example ligand Cerium oxide loading / wt% Example 1 Ethylene glycol 21.8 Example 2 Phthalic acid 15.3 Example 3 Acetic acid 12.5 Example 4 Triethylamine 13.2 Example 5 EDTA 16.1 Example 6 citric acid 14.5 Example 7 Methanol 10.8 Example 8 Acetonitrile 11.6

[0076] Comparative Example 1

[0077] The experimental process was the same as that of Example 1, except that in step (2), no ligand was added and "500 mL of ethylene glycol aqueous solution" was replaced by "500 mL of water".

[0078] The cerium oxide ceramic aerogel obtained by testing had a cerium oxide content of 0.02 wt %, indicating that the cerium oxide loading was greatly reduced without the introduction of a ligand.

[0079] The following catalytic performance of VOCs was tested using the Pt / cerium oxide ceramic aerogel catalyst in Example 1 with the highest cerium oxide loading.

[0080] Test of the catalytic performance of precious metal / cerium oxide ceramic aerogel catalyst on VOCs:

[0081] The following catalytic performance test is a laboratory test. Based on economic and practical operation, the temperature and reaction time of the catalytic reaction are limited.

[0082] The specific test methods are as follows:

[0083] The catalyst dosage was 5g, the initial toluene concentration was 1-1000ppm, the flow rate was 50L / min, the toluene to air ratio was 1:2, and the reaction temperature was 150°C. Toluene concentration before and after treatment was monitored using an online gas chromatograph. The toluene degradation efficiency results are shown in Table 2, and the toluene content in the tail gas is shown in Table 3.

[0084] Table 2

[0085]

[0086] Table 3

[0087]

[0088] The data results in Table 2 and Table 3 show that compared with Comparative Example 1, the Pt / cerium oxide ceramic aerogel catalyst prepared in Example 1 can effectively degrade toluene into CO2 and the toluene content in the tail gas meets the requirements of the national emission standards (≤100 mg / m 3 ), when the initial toluene concentration is 1-1000ppm, the toluene degradation efficiency is as high as 99.7%-99.9%.

[0089] In addition, the noble metal / cerium oxide ceramic aerogel catalyst of the present invention has high catalytic activity for VOCs, especially toluene, and a short catalytic reaction time of only 0.2-0.5s. There is no obvious performance decline after 120h of catalysis.

[0090] Although the embodiments disclosed herein are as described above, the contents described herein are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of protection of the present invention shall remain subject to the scope defined by the appended claims.

Claims

1. A method for preparing an aerogel catalyst, the aerogel catalyst comprising a ceramic aerogel carrier and cerium oxide supported on the carrier; The carrier is further loaded with a precious metal, wherein the precious metal is selected from one or more of platinum, palladium, rhodium, ruthenium, osmium, iridium and gold; The preparation method of the aerogel catalyst comprises: (1) impregnating the ceramic aerogel support in a cerium salt solution, wherein the cerium salt solution comprises a cerium salt, a ligand, and water; (2) drying and sintering the impregnated ceramic aerogel support to obtain a cerium oxide ceramic aerogel catalyst; (3) immersing the cerium oxide ceramic aerogel catalyst described in step (2) in a noble metal salt solution, and loading the noble metal on the catalyst by an in-situ reduction method; In step (1), the ligand is selected from at least one of phthalic acid, ethylene glycol, and ethylenediaminetetraacetic acid.

2. The preparation method according to claim 1, characterized in that The carrier is SiO2 / Al2O3 ceramic fiber aerogel; and / or The porosity of the ceramic aerogel carrier is 93%-98%; and / or The average particle size of the cerium oxide is 1 nm to 30 nm; and / or In the aerogel catalyst, the loading amount of cerium oxide is 10 wt%-30 wt%.

3. The preparation method according to claim 2, characterized in that The diameter of the ceramic fiber is 100nm-500nm.

4. The preparation method according to claim 1, characterized in that In the aerogel catalyst, the loading amount of cerium oxide is 15 wt%-25 wt%.

5. The preparation method according to claim 1, characterized in that The average particle size of the noble metal is 1 nm to 30 nm.

6. The preparation method according to claim 1, characterized in that The loading amount of the noble metal is 0.01-0.5 wt%.

7. The preparation method according to claim 1, characterized in that The loading amount of the noble metal is 0.01 wt%-0.1 wt%.

8. The preparation method according to claim 1, characterized in that In the cerium salt solution, the mass concentration of the ligand is 10-80wt%; and / or, the molar ratio of the cerium salt to the ligand is 1:(3-20); And / or, the cerium salt is selected from at least one of cerium nitrate, cerium chloride and cerium carbonate.

9. The preparation method according to claim 1, characterized in that In the cerium salt solution, the mass concentration of the ligand is 30-50 wt%.

10. The preparation method according to claim 1, characterized in that The molar ratio of the cerium salt to the ligand is 1:(3-10).

11. The preparation method according to claim 1, characterized in that The preparation method of the ceramic aerogel carrier comprises the following steps: A PVA solution, aluminum salt, a silane reagent and an alcohol solvent are mixed, and fiber filaments are obtained through a spinning technology. The fiber filaments are calcined to obtain SiO2 / Al2O3 ceramic fiber aerogel.

12. The preparation method according to claim 11, characterized in that The aluminum salt is selected from one or more of aluminum chloride, aluminum nitrate, and aluminum sulfate.

13. The preparation method according to claim 11, characterized in that The silane reagent is tetraethoxysilane.

14. The preparation method according to claim 11, characterized in that The mass volume ratio of the aluminum salt to the silane reagent is (0.5-3):1 g / mL.

15. The preparation method according to claim 11, characterized in that The calcination temperature is 500° C.-1800° C., and the calcination time is 2-5 hours.

16. The preparation method according to claim 1, characterized in that The dipping time is 5-50 min, And / or, in step (2), the sintering temperature is 400° C.-600° C.; And / or, in step (2), the sintering time is 1-8 hours.

17. The preparation method according to claim 1, characterized in that The dipping time is 25-35 minutes.

18. The preparation method according to claim 1, characterized in that In step (2), the sintering temperature is 450°C-550°C.

19. The preparation method according to claim 1, characterized in that In step (2), the sintering time is 2-5 hours.

20. The preparation method according to claim 1, characterized in that The noble metal salt includes at least one of the chloride, sulfate, and nitrate of the noble metal; And / or, the dipping time is 5-50 min; And / or, the in situ reduction method includes a light irradiation in situ reduction method.

21. The preparation method according to claim 1, characterized in that The noble metal salt includes at least one of chloroplatinic acid, platinum chloride, platinum nitrate, palladium chloride, ruthenium trichloride and chloroauric acid.

22. The preparation method according to claim 1, characterized in that The dipping time is 25-35 minutes.

23. The preparation method according to claim 1, characterized in that The in-situ reduction method includes reducing the precious metal by irradiation with xenon lamp light.

24. The preparation method according to claim 23, characterized in that The illumination time is 1 to 8 hours.

25. Use of the aerogel catalyst obtained by the preparation method according to any one of claims 1 to 24 in catalytic degradation of VOCs.

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