A catalyst for decomposing ozone at room temperature and a preparation method thereof

Abstract

The present invention discloses a catalyst for ambient-temperature ozone decomposition and a preparation method thereof, relating to the technical field of ozone decomposition catalysts. The preparation method of the catalyst for ambient-temperature ozone decomposition is as follows: Step S1, pretreatment and activation of honeycomb ceramics and activated carbon; in S1, the following steps are further included: S11, soaking and rinsing the honeycomb ceramics, followed by ultrasonic cleaning and drying; S12, subjecting the dried honeycomb ceramics to high-temperature calcination and pickling; S13, screening, soaking and rinsing, ultrasonic cleaning and pickling of the activated carbon; S14, subjecting the pretreated activated carbon to steam activation treatment. By pretreating and activating the honeycomb ceramics, activated carbon and glass fiber filter screen, the present invention can improve the purity, surface activity, catalytic efficiency, stability and durability of the catalyst for ambient-temperature ozone decomposition, and optimize the preparation process of the catalyst for ambient-temperature ozone decomposition.

Description

Technical Field

[0001] The present invention relates to the technical field of ozone decomposition catalysts, and specifically to a catalyst for ambient-temperature ozone decomposition and a preparation method thereof. Background Art

[0002] Traditional ozone decomposition catalysts contain impurities, which will reduce the catalytic activity of the catalysts and affect the efficiency of ozone decomposition. The ozone decomposition catalyst of the present application can improve the purity, surface activity, catalytic efficiency, stability and durability of the catalyst for ambient-temperature ozone decomposition, and optimize the preparation process of the catalyst for ambient-temperature ozone decomposition.

[0003] The defects of the existing ozone decomposition catalysts are as follows:

[0004] 1. Patent document KR101582233B1 discloses an ozone decomposition catalyst, a manufacturing method thereof, and a method for decomposing ozone using the same. This document mainly considers the problem of how to obtain satisfactory ozone decomposition efficiency, and does not consider how to solve the problems of improving the purity, surface activity, catalytic efficiency, stability and durability of the catalyst for ambient-temperature ozone decomposition, and optimizing the preparation process of the catalyst for ambient-temperature ozone decomposition;

[0005] 2. Patent document CN114471622B discloses an ozone decomposition catalyst and a preparation method thereof. This document mainly considers the problem of how to obtain an ozone decomposition catalyst with stable properties, high decomposition efficiency and strong moisture resistance, and does not consider how to solve the problems of improving the ozone decomposition efficiency of the catalyst for ambient-temperature ozone decomposition, enhancing the mechanical strength and durability of the catalyst for ambient-temperature ozone decomposition, and ensuring the stability and bonding force of the structure of the catalyst for ambient-temperature ozone decomposition;

[0006] 3. Patent document CN110433820B discloses a catalyst for decomposing ozone in gas and a preparation method thereof. This document mainly considers how to solve the problems of complex preparation process, poor bonding force between active components and carriers, and serious dust shedding existing in the ozone decomposition catalysts in the prior art, and does not consider how to solve the problems of improving the catalytic activity of the catalyst for ambient-temperature ozone decomposition for ozone decomposition, optimizing the catalytic performance of the catalyst for ambient-temperature ozone decomposition, and expanding the application range of the catalyst for ambient-temperature ozone decomposition;

[0007] 4. Patent document CN111974380B discloses an ozone decomposition catalyst and a preparation method thereof. This document mainly considers the problem of how to synthesize a new type of high-efficiency ozone decomposition catalyst using a simple process, and does not consider how to solve the problems of optimizing the formula of the catalyst for ambient-temperature ozone decomposition, evaluating the temperature stability of the catalyst for ambient-temperature ozone decomposition, and thus reducing the cost of the catalyst for ambient-temperature ozone decomposition; Summary of the Invention

[0008] The object of the present invention is to provide a catalyst for decomposing ozone at room temperature and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above object, the present invention provides the following technical solution: a catalyst for decomposing ozone at room temperature and a preparation method thereof. The preparation method of the catalyst for decomposing ozone at room temperature is as follows:

[0010] Step S1, pretreatment and activation of honeycomb ceramics and activated carbon;

[0011] Step S2, loading activated carbon onto the honeycomb ceramic carrier;

[0012] Step S3, pretreatment and activation of the glass fiber filter screen;

[0013] Step S4, compounding the glass fiber filter screen with the honeycomb ceramic carrier loaded with activated carbon;

[0014] Step S5, adding active components;

[0015] Step S6, performing performance detection on the catalyst for decomposing ozone at room temperature;

[0016] In S1, the following steps are further included:

[0017] S11, completely immerse the honeycomb ceramics with a size of 100mm×100mm×100mm in deionized water for 0.5h, rinse the soaked honeycomb ceramics with deionized water, then put the rinsed honeycomb ceramics into an ultrasonic cleaner, add deionized water to the ultrasonic cleaner, start the ultrasonic cleaner for cleaning for 0.5h, take out the cleaned honeycomb ceramics from the ultrasonic cleaner, place the honeycomb ceramics in a drying oven for drying treatment, the drying temperature is 120°C, and the drying time is 2 hours;

[0018] S12, put the dried honeycomb ceramics into a high-temperature furnace, raise the temperature to 400°C at a heating rate of 5°C / min, keep the temperature for 3h, after the calcination is completed, let the high-temperature furnace cool naturally to room temperature and then take out the honeycomb ceramics, immerse the calcined honeycomb ceramics in a 1mol / L nitric acid solution for 1h, continuously stir during the soaking process, after the pickling is completed, thoroughly rinse the honeycomb ceramics with deionized water until the rinsing liquid is neutral, and then place the rinsed honeycomb ceramics in a drying oven for drying, the drying temperature and time are the same as those during pretreatment;

[0019] S13. Screen the activated carbon using a sieve to obtain activated carbon with an average particle size of 10 mm. Immerse the activated carbon completely in deionized water for 0.5 h. Rinse the soaked activated carbon with deionized water. Then, put the rinsed activated carbon into an ultrasonic cleaner, add deionized water to the ultrasonic cleaner until the water level covers the activated carbon, and start the ultrasonic cleaner to clean for 0.5 h.

[0020] Immerse the activated carbon completely in a 1.5 mol / L dilute hydrochloric acid solution for 1 h, and continuously stir during the immersion process. After pickling, repeatedly rinse the activated carbon with deionized water until the rinsing solution is neutral. Place the rinsed and clean activated carbon in a drying oven for drying, with a drying temperature of 105 °C and a drying time of 2 hours.

[0021] S14. Load the pretreated activated carbon into a steam activation reactor and start heating to make the activated carbon reach the required activation temperature, which is 700 °C. After the activated carbon reaches the activation temperature, introduce steam and maintain the activation time for 2 h. After the activation is completed, stop heating and introducing steam, and let the steam activation reactor cool naturally to room temperature. Open the steam activation reactor to collect the activated carbon after steam activation.

[0022] Preferably, in S2, the following steps are further included:

[0023] S21. Crush the activated carbon after activation to obtain activated carbon powder with an average particle size of 1 mm. Mix the activated carbon powder with deionized water to form a uniform loading slurry. Add carboxymethyl cellulose as a binder. Immerse the pretreated and activated honeycomb ceramics in the loading slurry. After soaking for 5 h, take out the honeycomb ceramic carrier and use the compressed air method to remove the excess slurry on the surface.

[0024] S22. Place the honeycomb ceramic carrier loaded with activated carbon in a drying oven for drying treatment, with a drying temperature of 110 °C and a drying time of 4 h.

[0025] Preferably, in S3, the following steps are further included:

[0026] S31. Put a glass fiber filter screen with a size of 100 mm × 100 mm × 10 mm into a washing machine, add a neutral cleaner, and wash with deionized water for 20 min. After washing, rinse the filter screen with deionized water multiple times. Put the rinsed and clean glass fiber filter screen into a dryer, with a drying temperature of 65 °C and a drying time of 40 min.

[0027] S32. Fix the fiberglass filter screen on the workbench of the sandblasting machine for sandblasting. The sandblasting material is white fused alumina, the sandblasting pressure is 0.5 MPa, the sandblasting distance is 100 mm, the sandblasting time is 1.5 h. After the sandblasting treatment, wash and dry the fiberglass filter screen with deionized water.

[0028] Preferably, in S4, the following steps are further included:

[0029] S41. Uniformly coat a layer of acrylic binder on the surface of the honeycomb ceramic carrier loaded with activated carbon, and cover the pretreated and activated fiberglass filter screen on the honeycomb ceramic carrier coated with acrylic binder.

[0030] Preferably, in S4, the following steps are further included:

[0031] S42. Place the honeycomb ceramic carrier combined with the fiberglass filter screen and loaded with activated carbon in a vacuum chamber, start the vacuum pump to form a negative pressure environment, and the fiberglass filter screen will be adsorbed onto the honeycomb ceramic carrier to produce a preliminary combination with the acrylic binder, obtaining a preliminary composite material;

[0032] S43. Take out the preliminarily composite material after vacuum adsorption, place it in a mechanical pressing device, apply uniform pressure to the preliminarily composite material using a roller press, and then place the preliminarily composite material in a hot press for hot press curing treatment to obtain a complete composite material.

[0033] Preferably, in S5, the following steps are further included:

[0034] S51. Prepare a precursor solution through an active component precursor. Immerse the complete composite material in the precursor solution. After 10% of the total mass of the active component is fixed on the complete composite material, take out the complete composite material and dry it at 120 °C for 3 h, and calcine it at 500 °C for 3 h to prepare a catalyst for ambient temperature ozone decomposition.

[0035] Preferably, the active component precursor is one or more of 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, and nickel nitrate hexahydrate.

[0036] Preferably, in S6, the following steps are further included:

[0037] S61. Prepare precursor solutions numbered 1 - 9 in sequence through 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, nickel nitrate hexahydrate, 50% manganese nitrate solution and cobalt nitrate hexahydrate, 50% manganese nitrate solution and iron nitrate nonahydrate, 50% manganese nitrate solution and copper nitrate trihydrate, 50% manganese nitrate solution and nickel nitrate hexahydrate.

[0038] Preferably, in S6, the following steps are further included:

[0039] S62. Immerse the complete composite material in the precursor solution 1-9. After 10% of the total mass of the active component is fixed on the complete composite material, take out the complete composite material, dry it at 120 °C for 3 h, and calcine it at 500 °C for 3 h to obtain the catalyst 1-9 for ambient-temperature ozone decomposition.

[0040] Under the conditions of a temperature of 30 °C, a space velocity of 10,000 h-1, an oxygen concentration of 20 vol%, and an ozone concentration of 100 ppmv, with a catalyst loading of 2 g for the catalyst for ambient-temperature ozone decomposition, use an Eco Sensors UV-100 type ozone analyzer to measure the ozone decomposition efficiency of the catalyst 1-9 for ambient-temperature ozone decomposition under the same conditions respectively, and obtain a group of catalysts for ambient-temperature ozone decomposition with the maximum ozone decomposition efficiency.

[0041] Preferably, in S6, the following steps are further included:

[0042] S63. Under the conditions of a space velocity of 10,000 h-1, an oxygen concentration of 20 vol%, and an ozone concentration of 100 ppmv, use an Eco Sensors UV-100 type ozone analyzer to measure the ozone decomposition efficiency of the group of catalysts for ambient-temperature ozone decomposition with the maximum ozone decomposition efficiency at temperatures of 30 °C, 34 °C, 38 °C, 42 °C, 46 °C, and 50 °C respectively.

[0043] Compared with the prior art, the beneficial effects of the present invention are:

[0044] 1. The present invention pre-treats and activates honeycomb ceramics, activated carbon, and fiberglass filters through steps such as soaking in deionized water, ultrasonic cleaning, high-temperature calcination, and pickling. By these steps, impurities and pollutants on the surfaces of honeycomb ceramics, activated carbon, and fiberglass filters are effectively removed, significantly improving the purity of these materials. Moreover, the high-temperature calcination and pickling processes can further open the pore structures of honeycomb ceramics and activated carbon, increasing the specific surface area, thereby enhancing the surface activity of the catalyst for ambient-temperature ozone decomposition, which is beneficial to the adsorption and decomposition of ozone molecules. The activated carbon is treated with steam activation, and its pore structure is further optimized, forming more micropores and mesopores. These pore structures provide more adsorption sites and reaction channels for ozone molecules, thus significantly enhancing the catalytic efficiency of the catalyst for ambient-temperature ozone decomposition. The fiberglass filter is treated with sandblasting, making its surface rough, increasing the contact area with ozone molecules, and at the same time removing burrs and uneven parts on the surface, which is conducive to the uniform distribution and effective decomposition of ozone molecules. Through the pre-treatment and activation steps, the stability and consistency of the catalyst for ambient-temperature ozone decomposition during the preparation process are ensured, avoiding performance degradation or failure caused by impurities or defects, improving the preparation efficiency and yield of the catalyst for ambient-temperature ozone decomposition, reducing production costs, and the high-temperature calcination process not only removes volatile components in the materials but also enhances the thermal stability and chemical stability of honeycomb ceramics and activated carbon, enabling them to maintain stable catalytic performance under various environmental conditions. Therefore, it can solve the problems of improving the purity, surface activity, catalytic efficiency, stability, and durability of the catalyst for ambient-temperature ozone decomposition, as well as optimizing the preparation process of the catalyst for ambient-temperature ozone decomposition.

[0045] 2. In the present invention, activated carbon is loaded onto a honeycomb ceramic carrier, and a glass fiber filter is compounded with the honeycomb ceramic carrier loaded with activated carbon to obtain a complete composite material. Due to its high specific surface area and excellent adsorption performance, activated carbon can effectively adsorb ozone molecules, thereby promoting the decomposition of ozone. The honeycomb ceramic carrier has good mechanical strength and stability and can withstand stress changes under various environmental conditions. Loading activated carbon powder onto the honeycomb ceramic carrier can increase the contact area between activated carbon and ozone, improve the adsorption and decomposition efficiency of ozone, and also maintain the catalytic activity of activated carbon, significantly enhancing the mechanical strength and durability of the catalyst for ambient-temperature ozone decomposition. At the same time, the glass fiber filter has good air permeability and filtration performance, can evenly distribute the gas flow, reduce the air flow resistance, enable ozone molecules to more evenly contact the surface of the catalyst for ambient-temperature ozone decomposition, thus improving the decomposition efficiency. Moreover, the glass fiber filter can also block large particles from entering the interior of the catalyst for ambient-temperature ozone decomposition, protecting the catalyst for ambient-temperature ozone decomposition from contamination. By coating an acrylic binder on the honeycomb ceramic carrier and using vacuum adsorption and mechanical pressing techniques, the glass fiber filter is firmly bonded to the catalyst for ambient-temperature ozone decomposition to form a complete composite material. This bonding method not only enhances the stability of the composite material structure but also ensures the close contact between the filter and the catalyst for ambient-temperature ozone decomposition, improving the mass transfer efficiency of the catalytic reaction. Therefore, it can solve the problems of improving the ozone decomposition efficiency of the catalyst for ambient-temperature ozone decomposition, enhancing the mechanical strength and durability of the catalyst for ambient-temperature ozone decomposition, and ensuring the stability and bonding force of the structure of the catalyst for ambient-temperature ozone decomposition.

[0046] 3. By adding active components to the catalyst for ambient-temperature ozone decomposition, the precursor of the active components is one or more of 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, and nickel nitrate hexahydrate. A precursor solution is prepared with the precursor of the active components, and the complete composite material is impregnated in the precursor solution. After 10% of the total mass of the active components is fixed on the complete composite material, the complete composite material is taken out and dried at 120°C for 3 h and then calcined at 500°C for 3 h to obtain the catalyst for ambient-temperature ozone decomposition. The active components serve as active sites in the catalyst for ambient-temperature ozone decomposition, promoting the adsorption and decomposition of ozone molecules. By introducing these active components into the catalyst, the decomposition ability of the catalyst for ambient-temperature ozone decomposition towards ozone can be significantly improved. Calcining the catalyst for ambient-temperature ozone decomposition at high temperature can make its structure more stable, reducing the performance degradation caused by structural changes during use. At the same time, the interaction between the active components and the carrier will also be strengthened, thereby improving the durability and stability of the catalyst for ambient-temperature ozone decomposition. The impregnation method is used to fix the active components on the complete composite material. This method is simple to operate and easy to control, and can ensure the uniform distribution of the active components in the catalyst. Therefore, it can solve the problems of improving the catalytic activity of the catalyst for ambient-temperature ozone decomposition for ozone decomposition, optimizing the catalytic performance of the catalyst for ambient-temperature ozone decomposition, and expanding the application range of the catalyst for ambient-temperature ozone decomposition.

[0047] 4. By measuring the ozone decomposition efficiency of the catalysts for ambient-temperature ozone decomposition with different active components added under the same conditions, and measuring the ozone decomposition efficiency of the group of catalysts for ambient-temperature ozone decomposition with the highest ozone decomposition efficiency at temperatures of 30°C, 34°C, 38°C, 42°C, 46°C, and 50°C, by comparing the ozone decomposition efficiency of the catalysts for ambient-temperature ozone decomposition prepared with different active components and combinations of active components, it is possible to determine which combination or combinations of active components have the highest catalytic activity under specific conditions, which helps to optimize the formulation of the catalyst for ambient-temperature ozone decomposition and improve the ozone decomposition efficiency. After determining the combination of the catalysts for ambient-temperature ozone decomposition with the highest ozone decomposition efficiency, further measuring the ozone decomposition efficiency of this catalyst for ambient-temperature ozone decomposition at different temperatures can evaluate the temperature stability of the catalyst for ambient-temperature ozone decomposition, and can also identify the operating temperature range with the best performance of the catalyst for ambient-temperature ozone decomposition, which helps to achieve the best ozone decomposition effect, can more effectively decompose ozone in practical applications, reduce energy consumption and operating costs, and improve the overall economy and practicality. Therefore, it can solve the problems of optimizing the formulation of the catalyst for ambient-temperature ozone decomposition, evaluating the temperature stability of the catalyst for ambient-temperature ozone decomposition, and thus reducing the cost of the catalyst for ambient-temperature ozone decomposition. Description of the Drawings

[0048] Figure 1 This is the preparation flow chart of the present invention. Specific embodiments

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] Embodiment 1

[0051] Please refer to Figure 1 , an embodiment provided by the present invention: a catalyst for decomposing ozone at room temperature and its preparation method. The preparation method of the catalyst for decomposing ozone at room temperature is as follows:

[0052] Step S1, pretreatment and activation of honeycomb ceramics and activated carbon;

[0053] In S1, the following steps are further included:

[0054] S11. Immerse the honeycomb ceramics with a size of 100mm×100mm×100mm completely in deionized water for 0.5h. Rinse the soaked honeycomb ceramics with deionized water. Then put the rinsed honeycomb ceramics into an ultrasonic cleaner, add deionized water to the ultrasonic cleaner, start the ultrasonic cleaner for cleaning for 0.5h. Take out the cleaned honeycomb ceramics from the ultrasonic cleaner, and place the honeycomb ceramics in a drying oven for drying treatment. The drying temperature is 120°C and the drying time is 2 hours;

[0055] S12. Put the dried honeycomb ceramics into a high-temperature furnace, raise the temperature to 400°C at a heating rate of 5°C / min, keep the temperature for 3h. After the calcination is completed, let the high-temperature furnace cool naturally to room temperature and then take out the honeycomb ceramics. Immerse the calcined honeycomb ceramics in a 1mol / L nitric acid solution for 1h, and continuously stir during the immersion process. After pickling, rinse the honeycomb ceramics thoroughly with deionized water until the rinsing liquid is neutral. Then place the rinsed honeycomb ceramics in a drying oven for drying. The drying temperature and time are the same as those during pretreatment;

[0056] S13. Screen the activated carbon with a sieve to obtain activated carbon with an average particle size of 10mm. Immerse the activated carbon completely in deionized water for 0.5h. Rinse the soaked activated carbon with deionized water. Then put the rinsed activated carbon into an ultrasonic cleaner, add deionized water to the ultrasonic cleaner, and the water level of the deionized water covers the activated carbon. Start the ultrasonic cleaner for cleaning for 0.5h;

[0057] Completely immerse the activated carbon in a 1.5 mol / L dilute hydrochloric acid solution for 1 h, continuously stir during the immersion process. After pickling, repeatedly rinse the activated carbon with deionized water until the rinsing liquid is neutral. Place the rinsed activated carbon in a drying oven for drying, with a drying temperature of 105 °C and a drying time of 2 h;

[0058] S14. Load the pretreated activated carbon into a steam activation reactor and start heating to make the activated carbon reach the required activation temperature, which is 700 °C. After the activated carbon reaches the activation temperature, introduce steam and maintain the activation time for 2 h. After the activation is completed, stop heating and introducing steam, and let the steam activation reactor cool naturally to room temperature. Open the steam activation reactor to collect the activated carbon after steam activation.

[0059] Furthermore, soaking the honeycomb ceramics in deionized water and ultrasonic cleaning can remove surface impurities and dirt in the pores. Drying treatment ensures that the honeycomb ceramics will not be affected by moisture in subsequent steps. High-temperature calcination can remove volatile substances in the honeycomb ceramics and enhance its structural stability. Soaking and stirring in nitric acid solution helps to further purify the surface of the honeycomb ceramics, remove residual impurities, and increase the surface roughness through pickling, which is beneficial to the subsequent loading of the catalyst;

[0060] Obtain activated carbon with uniform particle size through sieving to ensure its uniform distribution in the catalyst. Soaking in deionized water and ultrasonic cleaning remove dust and impurities on the surface of the activated carbon. Soaking in dilute hydrochloric acid solution further purifies the surface of the activated carbon and removes possible metal ions and other impurities. Steam activation is the key step to improve the adsorption performance of activated carbon. Through steam treatment at high temperature, the pore structure of the activated carbon can be opened, increasing its specific surface area and adsorption capacity. The activated carbon after activation will have better catalytic activity, which is beneficial to the decomposition of ozone.

[0061] Example 2

[0062] Please refer to Figure 1 , an example provided by the present invention: a catalyst for ambient-temperature ozone decomposition and its preparation method. The preparation method of the catalyst for ambient-temperature ozone decomposition is as follows:

[0063] Step S2. Load the activated carbon onto the honeycomb ceramic carrier;

[0064] In S2, the following steps are further included:

[0065] S21. Crush and activate the activated carbon to obtain activated carbon powder with an average particle size of 1 mm. Mix the activated carbon powder with deionized water to form a uniform loading slurry. Add carboxymethyl cellulose as a binder, immerse the pretreated and activated honeycomb ceramics into the loading slurry, and after soaking for 5 h, take out the honeycomb ceramic carrier and use the compressed air method to remove the excess slurry on the surface;

[0066] S22. Place the honeycomb ceramic carrier loaded with activated carbon in a drying oven for drying treatment. The drying temperature is 110 °C and the drying time is 4 h.

[0067] Furthermore, crushing the activated carbon after activation into powder with an average particle size of 1 mm ensures that the activated carbon can be evenly distributed in the pores and on the surface of the honeycomb ceramics, thereby improving the catalytic efficiency. Mix the activated carbon powder with an appropriate amount of deionized water to form a uniform loading slurry. Adding carboxymethyl cellulose as a binder in the loading slurry can effectively adhere the activated carbon powder to the honeycomb ceramic carrier. By adjusting the addition amount of carboxymethyl cellulose, the viscosity of the loading slurry and the loading amount of activated carbon can be controlled;

[0068] Completely immerse the pretreated and activated honeycomb ceramics into the loading slurry and soak for 5 hours to ensure that the activated carbon can fully penetrate into the pores of the honeycomb ceramics and adhere to its surface. After soaking, use the compressed air method to remove the excess slurry on the surface of the honeycomb ceramic carrier to avoid the catalyst layer being too thick and affecting its air permeability and catalytic efficiency;

[0069] Place the honeycomb ceramic carrier loaded with activated carbon in a drying oven for drying treatment. The drying temperature is set at 110 °C and the drying time is 4 hours to ensure that the moisture is fully evaporated without affecting the structure and performance of the honeycomb ceramic carrier. After the drying treatment, the activated carbon powder loaded on the honeycomb ceramic carrier will form a uniform catalytic layer. This catalytic layer not only has a large specific surface area and a rich pore structure, but also forms a firm bond with the honeycomb ceramic carrier, thus ensuring the stability and durability of the catalyst.

[0070] Example Three

[0071] Please refer to Figure 1 , an embodiment provided by the present invention: A catalyst for decomposing ozone at room temperature and its preparation method. The preparation method of the catalyst for decomposing ozone at room temperature is as follows:

[0072] Step S3. Pretreatment and activation of the fiberglass filter screen;

[0073] In S3, the following steps are further included:

[0074] S31. Place a glass fiber filter screen with dimensions of 100mm×100mm×10mm into a washing machine, add a neutral cleaner, wash it with deionized water for 20 minutes. After the washing is completed, rinse the filter screen with deionized water multiple times. Then place the rinsed glass fiber filter screen into a dryer, with a drying temperature of 65°C and a drying time of 40 minutes.

[0075] S32. Fix the glass fiber filter screen on the workbench of a sandblasting machine for sandblasting. The sandblasting material is white corundum, the sandblasting pressure is 0.5 MPa, the sandblasting distance is 100 mm, and the sandblasting time is 1.5 hours. After the sandblasting treatment is completed, wash and dry the glass fiber filter screen with deionized water.

[0076] Furthermore, place a glass fiber filter screen with dimensions of 100mm×100mm×10mm into a washing machine, add an appropriate amount of neutral cleaner. The choice of the neutral cleaner is to avoid damaging the filter screen material while effectively removing the oil stains and dust on the filter screen surface. Wash it with deionized water for 20 minutes to ensure that the cleaner is fully dissolved and takes away impurities.

[0077] After the washing is completed, rinse the filter screen with deionized water multiple times to thoroughly remove the residual cleaner and impurities. Subsequently, place the rinsed glass fiber filter screen into a dryer, with a drying temperature of 65°C and a drying time of 40 minutes. The purpose of this step is to remove the moisture on the filter screen surface to prevent mildew or affect the catalyst loading effect during subsequent processing.

[0078] The sandblasting treatment is to increase the surface roughness of the glass fiber filter screen, increase its contact area and adhesion with the catalyst active component. Through the sandblasting treatment, adverse factors such as the oxide layer and rust spots on the surface of the glass fiber filter screen can be removed, making the surface of the glass fiber filter screen more flat and uniform. Fix the washed and dried glass fiber filter screen on the workbench of the sandblasting machine, select white corundum as the sandblasting material. White corundum has a moderate hardness and will not cause excessive damage to the glass fiber filter screen while effectively removing surface impurities. Set the sandblasting pressure to 0.5 MPa, the sandblasting distance to 100 mm, and the sandblasting time to 1.5 hours to ensure the best sandblasting effect.

[0079] After the sandblasting treatment is completed, wash the glass fiber filter screen with deionized water to remove the dust and impurities generated during the sandblasting process. Subsequently, place the glass fiber filter screen in a drying oven for drying to ensure that there is no moisture residue on the surface of the glass fiber filter screen.

[0080] Example 4

[0081] Please refer to Figure 1, an embodiment provided by the present invention: a catalyst for ambient-temperature ozone decomposition and its preparation method. The preparation method of the catalyst for ambient-temperature ozone decomposition is as follows:

[0082] Step S4: Composite the fiberglass filter screen with the honeycomb ceramic carrier loaded with activated carbon;

[0083] In S4, the following steps are further included:

[0084] S41: Uniformly coat a layer of acrylic adhesive on the surface of the honeycomb ceramic carrier loaded with activated carbon, and cover the pretreated and activated fiberglass filter screen on the honeycomb ceramic carrier coated with acrylic adhesive.

[0085] S42: Place the honeycomb ceramic carrier composite with the fiberglass filter screen and loaded with activated carbon in a vacuum chamber, start the vacuum pump to form a negative pressure environment, and the fiberglass filter screen will be adsorbed onto the honeycomb ceramic carrier to produce a preliminary bond with the acrylic adhesive, obtaining a preliminary composite material;

[0086] S43: Take out the preliminary composite material after vacuum adsorption, place it in a mechanical pressing device, use a roller press to apply uniform pressure to the preliminary composite material, and then place the preliminary composite material in a hot press for hot press curing treatment to obtain a complete composite material.

[0087] Furthermore, first, uniformly coat a layer of acrylic adhesive on the surface of the honeycomb ceramic carrier loaded with activated carbon. The acrylic adhesive has good bonding performance and weather resistance, which can ensure a firm bond between the fiberglass filter screen and the honeycomb ceramic carrier. Subsequently, cover the pretreated and activated fiberglass filter screen on the honeycomb ceramic carrier coated with acrylic adhesive to ensure alignment and close contact between the filter screen and the carrier, so that the adhesive can fully play its role;

[0088] Place the honeycomb ceramic carrier composite with the fiberglass filter screen and loaded with activated carbon in a vacuum chamber, start the vacuum pump to form a negative pressure environment. Under the action of the negative pressure, the fiberglass filter screen will be adsorbed onto the honeycomb ceramic carrier to produce a preliminary bond with the acrylic adhesive. This step helps to remove air and impurities between the filter screen and the carrier and improve the bonding strength. After vacuum adsorption, a preliminary composite material is obtained. At this time, a relatively stable bond has been formed between the fiberglass filter screen and the honeycomb ceramic carrier, but further curing treatment is still required to enhance its durability;

[0089] Take out the preliminary composite material after vacuum adsorption, place it in a mechanical pressing device, use a roller press to apply uniform pressure to the preliminary composite material to further compact the bonding layer between the fiberglass filter screen and the honeycomb ceramic carrier and eliminate possible tiny voids;

[0090] Next, the preliminary composite material is placed in a hot press for hot pressing and curing treatment. The hot pressing and curing treatment can cause the acrylic adhesive to undergo a chemical reaction at high temperature to form stronger chemical bonds, thereby enhancing the bonding strength between the fiberglass-like filter screen and the honeycomb ceramic carrier. At the same time, the hot pressing treatment also helps to improve the overall stability and durability of the composite fiberglass-like filter screen and the honeycomb ceramic carrier. After the hot pressing and curing treatment, a complete composite material is obtained.

[0091] Example Five

[0092] Please refer to Figure 1 , an example provided by the present invention: a room-temperature ozone decomposition catalyst and its preparation method. The preparation method of the room-temperature ozone decomposition catalyst is as follows:

[0093] Step S5: Add active components;

[0094] In S5, the following steps are further included:

[0095] S51: Prepare a precursor solution through an active component precursor. Immerse the complete composite material in the precursor solution. After 10% of the total mass of the active component is fixed on the complete composite material, take out the complete composite material and dry it at 120 °C for 3 h, and calcine it at 500 °C for 3 h to obtain a room-temperature ozone decomposition catalyst.

[0096] The active component precursor is one or more of 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, and nickel nitrate hexahydrate.

[0097] Furthermore, immerse the completely composite material after composite treatment in the precursor solutions 1-9 respectively. The immersion time should be long enough to ensure that the precursor solutions 1-9 can fully penetrate into the pores and surface of the completely composite material, so as to fix 10% of the total mass of the active component. After the immersion is completed, gently take out the completely composite material to avoid excessive dripping of the precursor solutions 1-9;

[0098] Place the completely composite material impregnated with the precursor solution in an oven and perform a drying treatment at 120 °C for 3 hours to ensure that the solvent in the precursor solution is completely evaporated and at the same time form a uniform coating of the precursor on the surface of the completely composite material;

[0099] After drying, put the completely composite material into a high-temperature furnace and perform a calcination treatment at 500 °C for 3 hours. The purpose of this step is to cause the precursor to undergo a thermal decomposition reaction to be converted into a catalytically active oxide or composite oxide, and further improve the crystallinity and stability of the room-temperature ozone decomposition catalyst. At the same time, the calcination also helps to remove organic impurities and volatile substances that may remain in the room-temperature ozone decomposition catalyst.

[0100] Example VI

[0101] Please refer to Figure 1 , an embodiment provided by the present invention: a catalyst for ambient-temperature ozone decomposition and its preparation method. The preparation method of the catalyst for ambient-temperature ozone decomposition is as follows:

[0102] Step S6: Detect the ozone decomposition performance of the catalyst for ambient-temperature ozone decomposition;

[0103] In S6, the following steps are further included:

[0104] S61: Prepare precursor solutions numbered 1-9 by successively passing through 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, nickel nitrate hexahydrate, 50% manganese nitrate solution and cobalt nitrate hexahydrate, 50% manganese nitrate solution and iron nitrate nonahydrate, 50% manganese nitrate solution and copper nitrate trihydrate, and 50% manganese nitrate solution and nickel nitrate hexahydrate.

[0105] S62: Immerse the complete composite material in the precursor solutions 1-9. After fixing 10% of the total mass of the active components on the complete composite material, take out the complete composite material, dry it at 120°C for 3 h, and calcine it at 500°C for 3 h to obtain catalysts 1-9 for ambient-temperature ozone decomposition;

[0106] Under the conditions of a temperature of 30°C, a space velocity of 10000 h-1, an oxygen concentration of 20 vol%, and an ozone concentration of 100 ppmv, with a catalyst loading of 2 g for the catalyst for ambient-temperature ozone decomposition, use an Eco Sensors UV-100 type ozone analyzer to measure the ozone decomposition efficiency of catalysts 1-9 for ambient-temperature ozone decomposition under the same conditions, and obtain a set of catalysts for ambient-temperature ozone decomposition with the highest ozone decomposition efficiency.

[0107] Furthermore, the measurement results are as follows:

[0108] Number Active component precursor Ozone decomposition efficiency (%) 1 50% Manganese nitrate solution 52.4 2 Cobalt(II) nitrate hexahydrate 34.8 3 Iron(III) nitrate nonahydrate 36.8 4 Copper(II) nitrate trihydrate 27.5 5 Nickel(II) nitrate hexahydrate 37.2 6 50% Manganese nitrate solution and cobalt(II) nitrate hexahydrate 69.4 7 50% Manganese nitrate solution and iron(III) nitrate nonahydrate 96.1 8 50% Manganese nitrate solution and copper(II) nitrate trihydrate 92.6 9 50% Manganese nitrate solution and nickel(II) nitrate hexahydrate 74.8

[0109] The measurement results show that: using the precursor solution 7 prepared by 50% manganese nitrate solution and iron nitrate nonahydrate to prepare the catalyst 7 for ambient-temperature ozone decomposition, under the conditions of a temperature of 30°C, a space velocity of 10000 h-1, an oxygen concentration of 20 vol%, an ozone concentration of 100 ppmv, and a catalyst loading of 2 g for the catalyst for ambient-temperature ozone decomposition, the ozone decomposition efficiency is the highest.

[0110] Example VII

[0111] Please refer to Figure 1, an embodiment provided by the present invention: a catalyst for ambient-temperature ozone decomposition and its preparation method. The preparation method of the catalyst for ambient-temperature ozone decomposition is as follows:

[0112] Step S6: Detect the ozone decomposition performance of the catalyst for ambient-temperature ozone decomposition;

[0113] In S6, the following steps are further included:

[0114] S63: Under the conditions of a space velocity of 10,000 h-1, an oxygen concentration of 20 vol%, and an ozone concentration of 100 ppmv, use an Eco Sensors UV-100 type ozone analyzer to measure the ozone decomposition efficiency of a set of catalysts for ambient-temperature ozone decomposition with the maximum ozone decomposition efficiency at temperatures of 30°C, 34°C, 38°C, 42°C, 46°C, and 50°C respectively.

[0115] Furthermore, a set of catalysts for ambient-temperature ozone decomposition with the maximum ozone decomposition efficiency is the catalyst 7 for ambient-temperature ozone decomposition;

[0116] The measurement results are as follows:

[0117] Temperature (°C) 30 34 38 42 46 50 Ozone decomposition efficiency (%) 96.1 98.2 99.6 99.7 99.8 99.6

[0118] The measurement results show that: when the temperature is between 30°C and 46°C, the ozone decomposition efficiency of the catalyst 7 for ambient-temperature ozone decomposition increases; when the temperature is 50°C, the ozone decomposition efficiency of the catalyst 7 for ambient-temperature ozone decomposition is 0.1% lower than that at 46°C. Therefore, when using the catalyst 7 for ambient-temperature ozone decomposition, the ozone decomposition efficiency is the best when the temperature is set at 46°C.

[0119] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A preparation method of a catalyst for decomposing ozone at room temperature, characterized in that, The preparation method of the catalyst for ambient-temperature ozone decomposition is as follows: Step S1: Pretreatment and activation of honeycomb ceramics and activated carbon; Step S2: Loading activated carbon onto the honeycomb ceramic carrier; Step S3: Pretreatment and activation of the fiberglass filter screen; Step S4: Compositing the fiberglass filter screen with the honeycomb ceramic carrier loaded with activated carbon; Step S5: Adding active components; Step S6: Conducting performance testing on the catalyst for ambient-temperature ozone decomposition; In S1, the following steps are further included: S11: Completely immerse the honeycomb ceramics with a size of 100mm×100mm×100mm in deionized water for 0.5h. Rinse the immersed honeycomb ceramics with deionized water. Then put the rinsed honeycomb ceramics into an ultrasonic cleaner, add deionized water to the ultrasonic cleaner, start the ultrasonic cleaner for cleaning for 0.5h. Take out the cleaned honeycomb ceramics from the ultrasonic cleaner, place the honeycomb ceramics in a drying oven for drying treatment, with a drying temperature of 120°C and a drying time of 2 hours; S12: Put the dried honeycomb ceramics into a high-temperature furnace, raise the temperature to 400°C at a heating rate of 5°C / min, keep the temperature for 3h. After the calcination is completed, let the high-temperature furnace cool naturally to room temperature and then take out the honeycomb ceramics. Immerse the calcined honeycomb ceramics in a 1mol / L nitric acid solution for 1h, continuously stir during the immersion process. After pickling, thoroughly rinse the honeycomb ceramics with deionized water until the rinsing liquid is neutral. Then place the rinsed honeycomb ceramics in a drying oven for drying, with the drying temperature and time being the same as those during pretreatment; S13: Screen the activated carbon using a sieve to obtain activated carbon with an average particle size of 10mm. Completely immerse the activated carbon in deionized water for 0.5h. Rinse the immersed activated carbon with deionized water. Then put the rinsed activated carbon into an ultrasonic cleaner, add deionized water to the ultrasonic cleaner, with the water level of the deionized water covering the activated carbon, start the ultrasonic cleaner for cleaning for 0.5h; Completely immerse the activated carbon in a 1.5mol / L dilute hydrochloric acid solution for 1h, continuously stir during the immersion process. After pickling, repeatedly rinse the activated carbon with deionized water until the rinsing liquid is neutral. Place the rinsed activated carbon in a drying oven for drying, with a drying temperature of 105°C and a drying time of 2 hours; S14: Load the pretreated activated carbon into a steam activation reactor and start heating to make the activated carbon reach the required activation temperature, which is 700°C. When the activated carbon reaches the activation temperature, introduce steam and keep the activation time for 2h. After the activation is completed, stop heating and introducing steam, let the steam activation reactor cool naturally to room temperature, and open the steam activation reactor to collect the activated carbon after steam activation.

2. The preparation method according to claim 1, characterized in that: In S2, the following steps are further included: S21. Crush and activate the activated carbon to obtain activated carbon powder with an average particle size of 1 mm. Mix the activated carbon powder with deionized water to form a uniform loading slurry. Add carboxymethyl cellulose as a binder, immerse the pretreated and activated honeycomb ceramics into the loading slurry. After soaking for 5 h, take out the honeycomb ceramic carrier and use the compressed air method to remove the excess slurry on the surface. S22. Place the honeycomb ceramic carrier loaded with activated carbon in an oven for drying treatment. The drying temperature is 110 °C and the drying time is 4 h.

3. The preparation method according to claim 1, characterized in that: In S3, the following steps are further included: S31. Put a glass fiber filter screen with a size of 100 mm × 100 mm × 10 mm into a washing machine, add a neutral cleaner, wash it with deionized water for 20 min. After the washing is completed, rinse the filter screen with deionized water multiple times. Put the rinsed glass fiber filter screen into a dryer. The drying temperature is 65 °C and the drying time is 40 min. S32. Fix the glass fiber filter screen on the workbench of a sandblasting machine for sandblasting treatment. The sandblasting material is white fused alumina, the sandblasting pressure is 0.5 MPa, the sandblasting distance is 100 mm, and the sandblasting time is 1.5 h. After the sandblasting treatment is completed, wash and dry the glass fiber filter screen with deionized water.

4. The preparation method according to claim 1, characterized in that: In S4, the following steps are further included: S41. Uniformly coat a layer of acrylic adhesive on the surface of the honeycomb ceramic carrier loaded with activated carbon, and cover the pretreated and activated glass fiber filter screen on the honeycomb ceramic carrier coated with acrylic adhesive.

5. The preparation method according to claim 4, characterized in that: In S4, the following steps are further included: S42. Place the honeycomb ceramic carrier loaded with activated carbon and compounded with a glass fiber filter screen in a vacuum chamber, start the vacuum pump to form a negative pressure environment, and the glass fiber filter screen will be adsorbed onto the honeycomb ceramic carrier to produce a preliminary combination with the acrylic adhesive, obtaining a preliminary composite material. S43. Take out the preliminarily composite material after vacuum adsorption, place it in a mechanical pressing device, use a roller press to apply uniform pressure to the preliminary composite material, and then place the preliminary composite material in a hot press for hot pressing and curing treatment to obtain a complete composite material.

6. The preparation method according to claim 1, characterized in that: In S5, the following steps are further included: S51. Prepare a precursor solution through an active component precursor. Immerse the complete composite material in the precursor solution. After 10% of the total mass of the active component is fixed on the complete composite material, take out the complete composite material and dry it at 120 °C for 3 h and calcine it at 500 °C for 3 h to prepare a catalyst for normal-temperature ozone decomposition.

7. The preparation method according to claim 6, characterized in that: The active component precursor is one or more of 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, and nickel nitrate hexahydrate.

8. The preparation method according to claim 1, characterized in that: In S6, the following steps are further included: S61. Prepare precursor solutions numbered 1 - 9 in sequence through 50% manganese nitrate solution, cobalt nitrate hexahydrate, iron nitrate nonahydrate, copper nitrate trihydrate, nickel nitrate hexahydrate, 50% manganese nitrate solution and cobalt nitrate hexahydrate, 50% manganese nitrate solution and iron nitrate nonahydrate, 50% manganese nitrate solution and copper nitrate trihydrate, and 50% manganese nitrate solution and nickel nitrate hexahydrate.

9. The preparation method according to claim 1, characterized in that: In S6, the following steps are further included: S62. Immerse the complete composite material in the precursor solution 1-9. After fixing 10% of the total mass of the active component on the complete composite material, take out the complete composite material, dry it at 120 °C for 3 h, and calcine it at 500 °C for 3 h to obtain the catalyst 1-9 for normal-temperature ozone decomposition; At a temperature of 30 °C, a space velocity of 10000 h -1 , an oxygen concentration of 20 vol% and an ozone concentration of 100 ppmv, the catalyst loading for the room-temperature ozone decomposition was 2 g. The ozone decomposition efficiency of catalysts 1-9 for room-temperature ozone decomposition was measured under the same conditions using an Eco Sensors UV-100 ozone analyzer, and a set of catalysts for room-temperature ozone decomposition with the highest ozone decomposition efficiency was obtained.

10. The preparation method according to claim 1, characterized in that: In S6, the following steps are further included: S63. A group of catalysts for ambient-temperature ozone decomposition with the highest ozone decomposition efficiency is used. Under the conditions of a space velocity of 10,000 h -1 , an oxygen concentration of 20 vol% and an ozone concentration of 100 ppmv, the ozone decomposition efficiency at temperatures of 30°C, 34°C, 38°C, 42°C, 46°C and 50°C is measured respectively using an Eco Sensors UV-100 type ozone analyzer.

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