Preparation method of supported alumina catalyst for efficient catalytic oxidation of acetone and catalyst

Abstract

The preparation method comprises the following steps: dissolving a certain amount of noble metal palladium chlorate or silver nitrate in a certain amount of absolute methanol to obtain a solution A; adding a certain amount of alumina powder into a certain amount of absolute methanol to obtain a solution B; adding the solution A into the solution B, and adding a certain amount of methanol solution of 1M sodium hydroxide; and centrifugally washing the obtained precipitate with absolute ethyl alcohol for 3-5 times, drying at 60-80 DEG C for 12-15 hours, and calcining in a tubular furnace at 400-500 DEG C in a hydrogen atmosphere to obtain the noble metal loaded aluminum oxide catalyst. The preparation process is simple and practical, the particle size of the noble metal Pt or Ag is reduced to dispersed single atoms, the dispersity is improved, the noble metal loading amount required by catalysis is reduced, the cost is reduced, and the prepared catalyst is stable in catalytic performance, good in activity and high in catalytic efficiency and can be commercially used.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of materials and environmental protection technology, and particularly relates to a preparation method of a supported alumina high-efficiency catalytic oxidation acetone catalyst and the catalyst. BACKGROUND

[0002] Acetone, also known as dimethyl ketone, is a volatile organic compound (VOC) that is harmful to the environment and human health, and is a colorless liquid with low boiling point, high volatility and high irritability. Acetone is widely used in many industries, including chemical industry, printing and dyeing, coating, cleaning agent, etc. The emission of acetone has a great impact on the environment and human health, and is also an important factor causing haze and acid rain. At the same time, it can also affect the respiratory system and nervous system of the human body. With the increasing concern and requirement of environmental protection, it is necessary to strengthen the control of acetone and reduce the emission of acetone in order to protect the environment and health.

[0003] At present, the main methods for treating acetone waste liquid are recovery technology, absorption method, direct combustion method and catalytic oxidation method. The recovery method consumes high energy and produces secondary pollution, and is not suitable for treating low-concentration acetone-containing waste liquid. The absorption method uses a specific solvent to absorb the harmful components in the acetone waste liquid. This method is relatively simple and convenient to operate, but it requires high investment and occupies a large area of equipment. It is not suitable for high-concentration conditions, and there are still volatile gases remaining after absorption treatment, which cannot reduce VOC to zero. If high temperature is encountered, the absorption rate will decrease. The combustion method can also be used for acetone, which is an organic ketone. However, this method will produce serious secondary pollution and require high energy consumption in the early stage. Due to these shortcomings, it is rarely used in actual production and life. The catalytic oxidation method uses catalysts to convert organic acetone waste liquid into harmless carbon dioxide and water under certain reaction conditions. It has the advantages of low reaction temperature, good safety and high conversion efficiency. At the same time, it avoids the problem of secondary pollution caused by high-temperature combustion, and meets the requirements of clean production.

[0004] The catalysts for catalytic oxidation of volatile organic compounds are mainly divided into noble metal catalysts and transition metal oxide catalysts. Noble metal catalysts such as Pt and Ag have high catalytic activity. However, the high price and easy deactivation of these catalysts have not been well solved, which limits the commercial application of these catalysts in the treatment of volatile organic compounds. SUMMARY

[0005] The preparation method of the present application reduces the particle size of noble metal palladium or silver to dispersed single atoms, reduces the required noble metal loading for catalysis, and reduces the cost. The preparation method is simple and stable in performance.

[0006] In order to solve the above problems, the application provides a supported alumina high-efficiency catalytic oxidation of acetone catalyst and a preparation method, solves the problem of removing volatile organic compounds in oxygen-containing blast furnace gas, has simple and practical preparation process, reduces the particle size of noble metal Pt or Ag to dispersed single atoms, improves the dispersion degree, reduces the noble metal load required for catalysis, reduces the noble metal consumption, reduces the cost, and the prepared catalyst has stable catalytic performance, good activity and high efficiency, and can be commercially used.

[0007] The application is implemented as follows: In one aspect, the application provides a preparation method of a supported alumina high-efficiency catalytic oxidation of acetone catalyst, which reduces the noble metal load required for catalysis by reducing the particle size of noble metal palladium or silver to dispersed single atoms, and the method comprises the following steps: Step 1, a certain amount of palladium chlorate or silver nitrate is dissolved in a certain amount of anhydrous methanol to obtain a precursor solution A; Step 2, a certain amount of alumina powder is added to a certain amount of anhydrous methanol to obtain a precursor solution B, and stirring is performed for 30-60 minutes; Step 3, solution A is added to solution B, stirring is performed for 40-60 minutes, then a certain amount of 1M sodium hydroxide methanol solution is added, and stirring is continuously performed for 2-3 hours; Step 4, standing, removing the supernatant, adding a certain amount of anhydrous ethanol to the obtained precipitate, mixing, then centrifuging at a speed of 5000 revolutions per minute, removing the supernatant, and retaining the precipitate, which is repeated for 3-5 times; Step 5, the obtained final precipitate is dried at 60-80℃ for 12-15 hours, and the water content of the dried precipitate is 0, which reaches complete drying; Step 6, a tubular furnace is calcined at 400-500℃ for 3 hours in a hydrogen atmosphere, and the noble metal loaded alumina catalyst is obtained, wherein the hydrogen atmosphere condition is that the concentration of the hydrogen gas introduced is 3% (30000 ppm), and the amount of the hydrogen gas introduced is 50ml / min.

[0008] The amount ratio of the noble metal palladium chlorate or silver nitrate in the precursor solution A in step 1 to the anhydrous methanol is 1-1.5g:500ml.

[0009] The amount ratio of the alumina in the precursor solution B in step 2 to the anhydrous methanol is 1g:100ml.

[0010] The mass ratio of the palladium chlorate or silver nitrate to the alumina in the precursor solutions A and B is 1-1.5g:5g.

[0011] The amount ratio of the palladium chlorate or silver nitrate in the mixed solution of the solutions A and B to the 1M sodium hydroxide methanol solution is 1g:67.5ml.

[0012] The amount of anhydrous ethanol used in step 4 is 0.01-0.15 g of palladium chlorate or silver nitrate to 50 ml of anhydrous ethanol.

[0013] In another aspect, the present application is a catalyst prepared by the above method, the catalyst component mass percentage: Ag or Pt is 0.5%-1%, Al is 50%-53%, O is 46%-49%, the specific surface area is 135-145 m 2 / g, and the pore size is 18-22 nm.

[0014] Further, the catalyst is used for catalyzing the oxidation of acetone, and the removal rate of acetone is tested under the conditions of 180℃, gas flow of 200 mL / min, acetone concentration of 1000 ppm, O2 concentration of 21%, N2 as balance gas, and space velocity of 24000 h -1 The removal rate of acetone is greater than 97%. The present application has the following advantages: the present application uses palladium chlorate or silver nitrate and alumina to prepare a single-atom supported alumina catalyst containing noble metal palladium or silver, and applies it to the catalytic oxidation process of acetone, which has the following advantages compared with the prior art: (1) The size of the noble metal particles is reduced to dispersed single atoms, the synthesis method is simple, the amount of noble metal used is small, and the usage is reduced from grams per gram of catalyst to milligrams per gram of catalyst; (2) Alumina is used as a carrier, and the excellent specific surface area and suitable pore structure of alumina enhance the mechanical strength of the catalyst, improve the catalytic efficiency, prolong the service life of the catalyst, and reduce the use cost of the catalyst.

[0015] (3) The single-atom catalyst prepared by the method can catalyze oxidation at a lower temperature, effectively oxidize and decompose acetone, and the oxidation and decomposition rate can reach more than 97%. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the process flow chart of the preparation method of the present application; Figure 2 is the graph of the removal rate of acetone with time of the examples and comparative examples of the present application.

[0017] Figure 3 is the scanning electron microscope image of the alumina catalyst prepared in Example 3 of the present application; Figure 4 is the spherical aberration electron microscope image of the Pt single-atom supported alumina catalyst prepared in Example 3 of the present application; Figure 5 is the spherical aberration electron microscope image of the Pt supported alumina catalyst prepared in Comparative Example 1 of the present application Figure 6 is a spherical aberration electron microscope image of the material Pt supported alumina catalyst prepared in Comparative Example 2 of the present application; Figure 7 is a spherical aberration electron microscope image of the material Pt supported alumina catalyst prepared in Comparative Example 3 of the present application; DETAILED DESCRIPTION

[0018] To further illustrate the technical means adopted by the present application and its effects, the present application is further described below in conjunction with the examples and drawings. It can be understood that the specific embodiments described herein are merely used to explain the present application, but not to limit the present application.

[0019] The present embodiment is a preparation method of a supported alumina high-efficiency catalyst for catalytic oxidation of acetone, as shown in Figure 1 by reducing the particle size of the noble metal palladium or silver to dispersed single atoms, reducing the noble metal loading required for catalysis, the preparation method steps are as follows: Step 1, a certain amount of palladium chlorate or silver nitrate is dissolved in a certain amount of anhydrous methanol to obtain precursor solution A; Step 2, a certain amount of alumina powder is added to a certain amount of anhydrous methanol to obtain precursor solution B, and stirred for 30-60 minutes; Step 3, add solution A to solution B, after stirring for 40-60 minutes, add a certain amount of 1M sodium hydroxide methanol solution, continue to stir for 2-3 hours, stand, and remove the supernatant; In the above steps, preferably, the mass ratio of palladium chlorate or silver nitrate to alumina in the precursor solution A, B is 1:50-150, 1g of alumina in the precursor solution B corresponds to 100ml of anhydrous methanol, and 0.02g of chlorate or nitrate in the mixed solution of solution A and solution B corresponds to 1.35ml of sodium hydroxide.

[0020] Step 4, add a certain amount of anhydrous ethanol to the obtained precipitate, mix, then centrifuge at a speed of 5000 revolutions / min, then remove the supernatant, and reserve the precipitate, repeat 3-5 times; Step 5, the final precipitate obtained is dried at 60-80°C for 12-15 hours, and the water content after drying is 0, achieving the effect of complete drying; Step 6, the tube furnace is calcined at 400-500°C for 3 hours under hydrogen atmosphere to obtain the noble metal supported alumina catalyst.

[0021] The catalyst component obtained by the above preparation method has the following mass percentage: 0.5%-1% of Ag or Pt, 50%-53% of Al, and 46%-49% of O. The catalyst has a removal rate of acetone of greater than 97% under the conditions of 180°C, a gas flow of 200 mL / min, an acetone concentration of 1000 ppm, an O2 concentration of 21%, N2 as the balance gas, and a space velocity of 24000 h-1. -1

[0022] It should be noted that in the following specific examples, the catalyst obtained by the preparation method of the present application is tested for the effect of catalytic oxidation of acetone, and the test conditions are as follows: the amount of catalyst is uniformly 50 mg, the reaction temperature is 180°C, the gas flow is 200 mL / min, the acetone concentration is 1000 ppm, the O2 concentration is 21%, N2 is used as the balance gas, and the space velocity is 24000 h-1. -1 The stability refers to the stable level of the removal rate of acetone being maintained at more than 97% within 5 hours.

[0023] Example 1 This example is an example of a preparation method of a supported alumina catalyst for efficient catalytic oxidation of acetone, and the preparation method steps are as follows: Step 1: Dissolve 0.03 g of chloroplatinic acid in 10 ml of anhydrous methanol to obtain solution A; Step 2: Add 1.5 g of alumina powder to 150 ml of anhydrous methanol to obtain solution B, and stir for 60 minutes; Step 3: Add solution A to solution B, stir for 60 minutes, then add 2.03 ml of 1M sodium hydroxide methanol solution, continue to stir for 2 hours, stand, and remove the supernatant; Step 4: Add 100 ml of anhydrous ethanol to the obtained precipitate, mix, then centrifuge at a speed of 5000 revolutions / min, remove the supernatant, and reserve the precipitate, repeat 3 times; Step 5: Dry the obtained final precipitate at 80°C for 12 hours; Step 6: Calcine the tube furnace at 400°C under a hydrogen atmosphere for 3 hours to obtain a noble metal Pt supported alumina catalyst.

[0024] The noble metal Pt supported alumina catalyst is detected, and the results are as follows: the preparation scheme can obtain about 1.36 g of catalyst, and the ICP detection of the catalyst component mass percentage is 0.67% of Pt, 52.58% of Al, and 46.75% of O.

[0025] The removal rate of acetone changes with time as shown in Figure 2 The catalyst prepared in this example can remove about 98% of acetone and maintain good stability. ​

[0026] Example 2 This example is an example of a preparation method of a supported alumina catalyst for efficient catalytic oxidation of acetone, and the preparation method steps are as follows: Step 1, 0.02 g of silver nitrate was dissolved in 10 ml of anhydrous methanol to obtain solution A; Step 2, 3 g of alumina powder was added to 300 ml of anhydrous methanol to obtain solution B, and stirred for 40 minutes; Step 3, solution A was added to solution B, and after stirring for 60 minutes, 1.35 ml of 1M sodium hydroxide methanol solution was added, and stirred for 2 hours, and then left to stand, and the supernatant was removed; Step 4, the obtained precipitate was added to 100 ml of anhydrous ethanol, mixed, and then centrifuged at a speed of 5000 rpm / min, and then the supernatant was removed, and the precipitate was reserved, and the above steps were repeated 4 times; Step 5, the obtained final precipitate was dried at 60°C for 15 hours, Step 6, the tube furnace was calcined at 400°C for 3 hours under a hydrogen atmosphere, and a noble metal Ag supported alumina catalyst was obtained.

[0027] The detection results show that about 2.75 g of catalyst can be obtained by the preparation scheme, and the mass percentage of Ag in the catalyst is 0.79%, the mass percentage of Al is 51.63%, and the mass percentage of O is 47.58% by ICP detection.

[0028] The removal rate of acetone changes with time as shown in Figure 2 The catalyst prepared in this example can completely remove acetone and maintain good stability.

[0029] Example 3 This example is an example of a preparation method of a supported alumina catalyst for efficient catalytic oxidation of acetone, and the preparation method steps are as follows: Step 1, 0.02 g of chloroplatinic acid was dissolved in 10 ml of anhydrous methanol to obtain solution A; Step 2, 1 g of alumina powder was added to 100 ml of anhydrous methanol to obtain solution B, and stirred for 50 minutes; Step 3, solution A was added to solution B, and after stirring for 60 minutes, 1.35 ml of 1M sodium hydroxide methanol solution was added, and stirred for 2 hours, and then left to stand, and the supernatant was removed; Step 4, the obtained precipitate was added to 100 ml of anhydrous ethanol, mixed, and then centrifuged at a speed of 5000 rpm / min, and then the supernatant was removed, and the precipitate was reserved, and the above steps were repeated 3 times; Step 5, the obtained final precipitate was dried at 80°C for 12 hours; Step 6, calcination in a tube furnace under air atmosphere at 400℃ for 3 hours to obtain the noble metal Pt supported alumina catalyst.

[0030] The detection results show that about 0.91 g of catalyst can be obtained by the preparation scheme, and the mass percentage of Pt is 0.71%, the mass percentage of Al is 51.03%, and the mass percentage of O is 48.26% by ICP detection.

[0031] The removal rate of acetone changes with time as shown in Figure 2 The catalyst prepared in this embodiment can completely remove acetone and maintain good stability.

[0032] The characterization test of this embodiment 3 is shown in Figure 3 , 4 . Figure 3 The TEM pictures of the alumina catalyst show that they are uniformly structured rod-like structures. Figure 4 The spherical aberration electron microscope image of the material Pt monatomic supported alumina nanorod prepared in embodiment 3 shows that single bright spots (in red circles) can be clearly seen in the spherical aberration corrected transmission electron microscope image, indicating that Pt monatomic atoms have been uniformly dispersed into the crystal lattice of the alumina nanorod. It can also be seen from the figure that no obvious clusters occur, indicating that the preparation method is effective and reliable.

[0033] The test results of the remaining examples are basically consistent with them, and will not be repeated here.

[0034] Comparative Example 1 This embodiment is a preparation method of a supported alumina catalyst, which is a comparative example about the calcination atmosphere of the tube furnace being air atmosphere. The preparation method comprises the following steps: Step 1, dissolve 0.02 g of chloroplatinic acid in 10 ml of anhydrous methanol to obtain solution A; Step 2, add 1 g of alumina powder to 100 ml of anhydrous methanol to obtain solution B, and stir for 50 minutes; Step 3, add solution A to solution B, stir for 60 minutes, then add 1.35 ml of 1M sodium hydroxide methanol solution, and stir for 2 hours, stand, and remove the supernatant; Step 4, add the obtained precipitate to 100 ml of anhydrous ethanol, mix, then centrifuge at a speed of 5000 revolutions / min, then remove the supernatant, and reserve the precipitate, repeat for 3 times; Step 5, dry the final precipitate obtained at 80℃ for 12 hours; Step 6, calcination in a tube furnace under air atmosphere at 400℃ for 3 hours to obtain the noble metal Pt supported alumina catalyst.

[0035] The detection result: about 0.91 g catalyst can be obtained by the preparation scheme of the present comparative example, and the mass percentage of Pt: Al: O in the catalyst component is about 0.73: 51.02: 48.25 detected by ICP.

[0036] The removal rate of acetone of the catalyst prepared in the present comparative example changes with time as shown in Figure 2 The removal rate of acetone of the present comparative example decreases to about 60%, and gradually decreases with time. Compared with Example 5, the main difference of the present comparative example is that the calcination atmosphere of the tubular furnace is air atmosphere.

[0037] Figure 5 The scanning electron microscope image of the catalyst obtained in the present comparative example. In the preparation process of the catalyst in the present comparative example, the calcination treatment is carried out in air atmosphere, and it can be seen from the figure that the obtained catalyst is not completely reduced, and the Pt loaded particles of the obtained catalyst are about 3-5 nanometers, and no longer atomic level.

[0038] Comparative Example 2: The present embodiment is a preparation method of a supported alumina catalyst, which is a comparative example about centrifugal washing method, and the preparation method comprises the following steps: Step 1: dissolve 0.02 g of chloroplatinic acid in 10 ml of anhydrous methanol to obtain solution A; Step 2: add 1 g of alumina powder into 100 ml of anhydrous methanol to obtain solution B, and stir for 50 minutes; Step 3: add solution A to solution B, stir for 60 minutes, then add 1.35 ml of 1M sodium hydroxide methanol solution, and stir for 2 hours, stand, and remove the supernatant; Step 4: centrifuge the obtained mixed solution at a speed of 5000 revolutions / min, then remove the supernatant, and reserve the precipitate; Step 5: dry the obtained final precipitate at 80°C for 12 hours, Step 6: calcine the tubular furnace at 400°C for 3 hours in hydrogen atmosphere to obtain a noble metal Pt loaded alumina catalyst.

[0039] The detection result: about 0.92 g catalyst can be obtained by the preparation scheme of the present comparative example, and the mass percentage of Pt: Al: O in the catalyst component is about 0.75%: 51.42%: 47.83% detected by ICP. The removal rate of acetone of the catalyst prepared in the present comparative example changes with time as shown in Figure 2 The removal rate of acetone of the present comparative example decreases to about 86%. Compared with Example 5, the main difference of the present comparative example is that there is no repeated centrifugal washing and direct drying The removal rate of acetone of the catalyst prepared in the present comparative example changes with time as shown in Figure 2 Figure 6 ​This is a spherical aberration electron microscope image of the catalyst obtained in this comparative example. In this comparative example, the catalyst was prepared without repeated centrifugation and washing, and was directly dried. As can be seen in the image, all the undissolved Pt elements dried onto the catalyst surface, resulting in the formation of many 2-5 nanometer clusters of Pt elements on the surface.

[0040] Comparative Example 3: This embodiment is a method for preparing a supported alumina catalyst, and is a comparative example regarding the selection of solvent for solution B. The preparation method includes the following steps: Step 1: Dissolve 0.02g of chloroplatinic acid in 10ml of deionized water to obtain solution A; Step 2: Add 1g of alumina powder to 100ml of deionized water to obtain solution B, and stir for 50 minutes; Step 3: Add solution A to solution B, stir for 60 minutes, then add 1.35 ml of 1M sodium hydroxide deionized water solution, stir for 2 hours, let stand, and remove the supernatant. Step 4: Add 100 ml of anhydrous ethanol to the obtained precipitate, mix and centrifuge at 5000 rpm, then remove the supernatant and retain the precipitate. Repeat 3 times. Step 5: The resulting final precipitate is dried at 80°C for 12 hours; Step 6: Calcination in a tubular furnace at 400°C for 3 hours under a hydrogen atmosphere to obtain alumina catalyst supported on precious metal Pt.

[0041] Test results: This preparation method yields approximately 0.91g of catalyst. ICP analysis shows that the mass percentage of catalyst components Pt:Al:O is approximately 0.32%:51.31%:48.37%.

[0042] The acetone removal rate of the catalyst prepared in this comparative example changes over time as follows: Figure 2 As shown, the acetone removal rate of this comparative example decreased to approximately 78%. The main difference between this comparative example and Example 5 is that the solvent used in the preparation process was changed from anhydrous methanol to deionized water.

[0043] Figure 7 The image shows aberration-corrected electron microscopy (ESM) image of the catalyst obtained in Comparative Example 3. In the preparation of the catalyst in Comparative Example 3, the solvent was changed from anhydrous methanol to deionized water. As can be seen in the image, the silver nitrate in the obtained catalyst was not completely dissolved, and the Pt in the catalyst was in the form of large, unevenly distributed particle clusters.

[0044] The invention adopts the method of mixing palladium chlorate or silver nitrate of noble metal and alumina, and reducing sodium hydroxide to prepare the alumina catalyst containing noble metal palladium or silver single atom support, reduces the noble metal particle size to dispersed single atom, reduces the noble metal dosage from gram level to milligram level, the synthesis method is simple, and the cost is reduced; adopts alumina as the carrier, the excellent specific surface area and the suitable pore structure of alumina enhance the mechanical strength of the catalyst, improve the catalytic efficiency, prolong the catalyst life, and reduce the catalyst use cost.

[0045] The single atom catalyst prepared by the method can be used for catalytic oxidation under the condition of less than 200 DEG C, effectively oxidizes and decomposes acetone, and the oxidation and decomposition rate can reach more than 97%. Compared with the general catalysis which needs 250-300 DEG C working condition, energy can be saved, and the environment is more friendly.

Claims

1. A method for preparing a supported alumina high-efficiency catalytic oxidation of acetone catalyst, characterized in that, By reducing the particle size of noble metal palladium or silver to dispersed single atoms, the required noble metal loading for catalysis is reduced, the method steps are as follows: Step 1: a certain amount of noble metal palladium chloride or silver nitrate is dissolved in a certain amount of anhydrous methanol to obtain precursor solution A; Step 2: a certain amount of alumina powder is added to a certain amount of anhydrous methanol to obtain precursor solution B, and stirred for 30-60 minutes; Step 3: add solution A to solution B, after stirring for 40-60 minutes, add a certain amount of 1M sodium hydroxide methanol solution, continue to stir for 2-3 hours; Step 4: the obtained precipitate is added to a certain amount of anhydrous ethanol, mixed and centrifuged at 5000 rpm, then the supernatant is removed, the precipitate is reserved, and the above steps are repeated 3-5 times; Step 5: the final precipitate is dried at 60-80℃ for 12-15 hours, and the water content of the dried product is 0; Step 6: the tube furnace is calcined at 400-500℃ for 3 hours under hydrogen atmosphere, and the hydrogen atmosphere conditions are 30000ppm, 50ml / min.

2. The preparation method of the supported alumina high-efficiency catalytic oxidation acetone catalyst according to claim 1, characterized in that, The amount ratio of the noble metal palladium chloride or silver nitrate in the precursor solution A in step 1 to anhydrous methanol is 1-1.5g:500ml.

3. The method for preparing a supported alumina catalyst for efficient catalytic oxidation of acetone according to claim 1, characterized in that, The amount ratio of alumina to anhydrous methanol in the precursor solution B in step 2 is 1g:100ml.

4. The method for preparing a supported alumina catalyst for efficient catalytic oxidation of acetone according to claim 1, characterized by, The mass ratio of palladium chloride or silver nitrate to alumina in the precursor solutions A and B is 1-1.5g:5g.

5. The method for preparing a supported alumina catalyst for efficient catalytic oxidation of acetone according to claim 1, characterized by, The amount ratio of palladium chloride or silver nitrate to 1M sodium hydroxide methanol solution in the mixed solution of solution A and solution B is 1g:67.5ml.

6. The method for preparing a supported alumina catalyst for efficient catalytic oxidation of acetone according to claim 1, characterized in that, The amount of anhydrous ethanol used in step 4 is 0.01-0.15g of palladium chloride or silver nitrate corresponding to 50ml of anhydrous ethanol.

7. The catalyst obtainable by the process according to claims 1-6, characterized by that The catalyst component mass percentage: Ag or Pt is 0.5%-1%, Al is 50%-53%, O is 46%-49%, specific surface area is 140m 2 / g, pore size is 20nm.

8. The catalyst of claim 7, wherein The catalyst was used to catalyze oxidation of acetone, under the conditions of 180℃, gas flow of 200 mL / min, acetone concentration of 1000 ppm, O2 concentration of 21%, N2 as balance gas, space velocity of 24000 h-1 -1 The removal rate of acetone by the catalyst was tested under the conditions, and the removal rate was greater than 97%.

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