Catalyst for room-temperature oxidation tritium removal and preparation method thereof
By loading precious metal-rare earth metal oxide nanoclusters on the γ-Al2O3 carrier, the problems of poor room temperature tritium removal and complex carrier modification in the prior art are solved, and efficient, stable and simple room temperature tritium removal effect is achieved.
Patent Information
- Application Number
- CN202510056783.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-04-25
AI Technical Summary
The existing catalytic oxidation technology has poor tritium removal effect at room temperature, and the carrier surface modification preparation process is complicated. The introduction of organic matter has problems with radiation decomposition and tritium retention.
Using γ-Al2O3 as a carrier, the precious metal-rare earth metal oxide nanoclusters are loaded. Through a simple rotary distillation preparation method, carrier modification and organic matter are avoided, achieving efficient tritium removal at room temperature.
It realizes efficient oxidation and tritium removal under room temperature conditions, reduces energy consumption and operational complexity, simplifies the preparation process, and improves the stability and service life of the catalyst.
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Figure CN119869519A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tritium removal catalysts, and in particular to a catalyst for room temperature oxidation detritium removal and a preparation method thereof. Background Art
[0002] Tritium is a radioactive hydrogen isotope widely used in the field of nuclear energy. However, because of its radioactivity, it poses potential risks to the environment and human health, especially when tritium is released into the atmosphere in gaseous form, it can easily enter the human body through breathing and cause internal radiation hazards to organisms. Therefore, how to effectively and cost-effectively remove tritium-containing waste gas to avoid its impact on the environment and health has become an urgent problem to be solved in the current field of environmental protection and nuclear energy safety.
[0003] When treating tritium-containing waste gas, catalytic oxidation technology with deep detritiation characteristics is regarded as an effective way. The principle is to oxidize tritium gas into liquid tritium water under the action of a catalyst, and then collect it, so as to avoid direct discharge of tritium gas into the air. However, there are many challenges in the application of existing catalytic oxidation technology in the removal of tritium gas, such as the low activity and poor stability of traditional Pt / Al2O3 detritiation catalysts, especially the high reaction temperature and poor detritiation effect during the cold start phase of the detritiation device. Therefore, it is necessary to develop a catalyst that can efficiently remove tritium near room temperature. Some researchers have developed platinum catalysts modified with organic materials to improve room temperature reactivity. For example, in the article "De Novo Design of a Pt Nanocatalyst on a Conjugated Microporous Polymer-Coated Honeycomb Carrier for Oxidation of Hydrogen Isotopes", the polymer modified carrier was obtained by polymerizing the monomers 1,4-dibromobenzene and 1,3,5-benzenetriboric acid on the surface of cordierite with suspended p-bromobenzaldehyde. However, the preparation process for surface modification of cordierite is complicated, and the introduction of organic matter has disadvantages such as radiation decomposition and tritium retention. Therefore, it is necessary to develop a catalyst for detritus removal that is simple to prepare, does not require the introduction of organic matter for surface modification or modification, and is efficient at room temperature. Summary of the invention
[0004] The present invention aims to solve the problems of complicated preparation process of existing carrier surface modification and radiation decomposition of introduced organic matter, and provides a catalyst for efficient oxidation and detritium removal at room temperature without modifying the carrier and a preparation method thereof.
[0005] The technical method of the present invention is as follows:
[0006] A catalyst for room temperature oxidation detritium comprises: a carrier and a noble metal-rare earth metal oxide nanoclusters loaded on the carrier; wherein the carrier is γ-Al2O3.
[0007] The noble metal includes platinum and / or palladium.
[0008] The rare earth metal includes one or more of lanthanum, cerium and praseodymium.
[0009] The present invention also provides a method for preparing a catalyst for room temperature oxidation detritium removal, comprising:
[0010] Pre-treating the γ-Al2O3 to remove impurities in the γ-Al2O3 to obtain a γ-Al2O3 carrier;
[0011] Mixing a compound corresponding to the noble metal, an organic ligand and deionized water to obtain a noble metal complex solution;
[0012] Mixing a compound corresponding to the rare earth metal, an organic ligand and deionized water to obtain a rare earth metal complex solution;
[0013] Mixing the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water to obtain a mixed solution;
[0014] The mixed solution is evaporated, calcined and reduced to obtain a catalyst for room temperature oxidation and detritium removal.
[0015] The compound corresponding to the noble metal includes platinum salt and / or palladium salt, wherein the platinum salt includes one or more of platinum dichloride, chloroplatinic acid, and sodium chloroplatinate; the palladium salt includes one or more of palladium dichloride and sodium chloropalladate.
[0016] The compound corresponding to the rare earth metal includes one or more of lanthanum salt, cerium salt and praseodymium salt, wherein the lanthanum salt is lanthanum nitrate; the cerium salt is cerium nitrate; and the praseodymium salt is praseodymium nitrate.
[0017] The organic ligand includes any one of ethylenediamine, dimethyldiethylamine, diethylenetriamine and acetylacetone.
[0018] The molar ratio of the compound corresponding to the noble metal, the organic ligand and deionized water is 1:3-15:350-600; the molar ratio of the compound corresponding to the rare earth metal, the organic ligand and deionized water is 1:8-30:350-600; the molar ratio of the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water is 1:0.001-0.005:0.002-0.006:70-100.
[0019] The evaporation is carried out by a rotary evaporator, the evaporation temperature is 50-80°C, and the evaporation vacuum is 50-250hPa; the evaporation step comprises: the mixed liquid is completely evaporated by the rotary evaporator to obtain the metal-loaded γ-Al2O3.
[0020] The steps of calcining and reducing the metal-loaded γ-Al2O3 include: firstly, calcining the metal-loaded γ-Al2O3 at 400-600°C for 4-8h in an air atmosphere; and then reducing the calcined metal-loaded γ-Al2O3 at 300-500°C for 2-6h in a reducing atmosphere to obtain a catalyst for room temperature oxidation and detritium removal.
[0021] The beneficial effects of the present invention are:
[0022] 1. Although the prior art can make the catalyst suitable for room temperature by modifying the carrier, the introduction of organic matter into the carrier causes the catalyst to have the disadvantages of radiation decomposition and tritium retention. Therefore, the present invention provides a catalyst for room temperature oxidative detritium removal, which does not require modification of the carrier. By optimizing the nanoparticles loaded on the carrier, precious metal-rare earth metal oxide nanoclusters are obtained to enhance the catalytic activity of the catalyst. In the detritium removal reaction, the obtained catalyst reduces the detritium removal reaction energy barrier, thereby enabling the catalyst to achieve oxidative detritium removal at room temperature.
[0023] 2. The present invention adopts a commercial γ-Al2O3 catalyst carrier, which can be purchased directly, greatly simplifying the preparation process and eliminating the need for a complicated homemade process. At the same time, the carrier has strong universality and can be applied in different scenarios.
[0024] 3. The present invention adopts a simple rotary evaporation method to obtain the catalyst, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The long-term test performance results of the catalyst of Example 1 of the present invention;
[0026] Figure 2 This is the HAADF-EDS diagram of Example 2 of the present invention;
[0027] Figure 3 The intermittent test performance results of the catalyst of Example 3 of the present invention;
[0028] Figure 4 It is a comparison chart of Example 1 of the present invention and the commercial chloroplatinic acid impregnation method for preparing Pt / Al2O3 catalyst. DETAILED DESCRIPTION
[0029] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0030] Current detritiation catalysts usually require a higher reaction temperature to achieve the desired oxidation removal effect. This limitation increases the energy consumption of the equipment and the operating cost is high. At the same time, the high temperature environment will also have an adverse effect on the stability and life of the catalyst. At lower temperatures, the activity of traditional catalysts is usually poor, resulting in low detritiation efficiency. In addition, some catalysts are easily deactivated under certain high temperature conditions, requiring frequent replacement or maintenance, which increases the complexity of operation.
[0031] In view of the shortcomings of the above-mentioned prior art, the present invention provides a catalyst for room temperature oxidation detritium removal, comprising: a carrier and a noble metal-rare earth metal oxide nanoclusters supported on the carrier, wherein the carrier is γ-Al2O3.
[0032] In one embodiment, the noble metal includes platinum and / or palladium.
[0033] In one embodiment, rare earth metal oxides have unique electronic structures and good heat resistance and hydrophobic properties. At the same time, they can be used as modifiers to enhance the catalytic activity of active sites and the ability to repel ionized water. Therefore, the present invention also uses rare earth metals, which include one or more of lanthanum, cerium, and praseodymium.
[0034] The present invention uses precious metals and rare earth metal oxides to improve the activity of the catalyst at room temperature, avoid high-temperature reaction processes, thereby reducing energy consumption, simplifying operations, and can also be applied to a variety of application scenarios. At the same time, the precious metals and rare earths of the present invention have highly active and stable active sites, which increase the service life of the catalyst and reduce the frequency of material replacement.
[0035] In one embodiment, γ-Al2O3 may be commercial γ-Al2O3 particles. Commercial γ-Al2O3 particles include various shapes prepared based on γ-Al2O3, including cylindrical, annular, spherical, pressed tablets, mesh, powder, irregular, etc. The present invention uses a commercial γ-Al2O3 catalyst carrier, because it can be purchased directly, which greatly simplifies the preparation process and does not require a complicated homemade process. At the same time, the carrier has strong universality and can be applied to different scenarios.
[0036] In one embodiment, the molar ratio of γ-Al2O3, noble metal, and rare earth metal can be 1: 0.001-0.005: 0.002-0.006. In the present invention, by adjusting the ratio of noble metal and rare earth metal, the active sites of the noble metal-rare earth metal oxide nanoclusters on the surface of the carrier can be adjusted, thereby achieving room temperature oxidation and detritium removal.
[0037] The present invention also provides a method for preparing a catalyst for room temperature oxidation detritium removal, comprising:
[0038] S1. Pre-treating γ-Al2O3 to remove impurities in γ-Al2O3 to obtain a γ-Al2O3 carrier.
[0039] In one embodiment, the pretreatment step includes: calcining the γ-Al2O3 particles at 450-650° C. for 8-12 hours. Calcination can remove organic impurities in the γ-Al2O3 and improve the purity of the γ-Al2O3.
[0040] Before the calcination treatment, a washing and drying step may also be included. The washing step includes rinsing with deionized water until the water is clear and has no obvious impurities. The drying step also includes drying the washed γ-Al2O3 particles at 50-100°C for 6-10 hours. Here, the washing and drying steps can further remove organic impurities in the γ-Al2O3 and improve the purity of the γ-Al2O3.
[0041] S2. Mixing the compound corresponding to the noble metal, the organic ligand and deionized water to obtain a noble metal complex solution.
[0042] In one embodiment, the compound corresponding to the noble metal includes platinum salt and / or palladium salt. The platinum salt includes one or more of platinum dichloride, chloroplatinic acid, and sodium chloroplatinate; the palladium salt includes one or more of palladium dichloride and sodium chloropalladate.
[0043] In one embodiment, the organic ligand includes any one of ethylenediamine, dimethyldiethylamine, diethylenetriamine, and acetylacetone.
[0044] In one embodiment, the molar ratio of the compound corresponding to the noble metal, the organic ligand and deionized water is 1:3-15:350-600. For example, the molar ratio of the compound corresponding to the noble metal, the organic ligand and deionized water is 1:4:400, 1:8:500, 1:12:550.
[0045] In one embodiment, the mixing can be performed by magnetic stirring, and the stirring time is 240-1440 minutes.
[0046] S3. Mixing the compound corresponding to the rare earth metal, the organic ligand and deionized water to obtain a rare earth metal complex solution.
[0047] In one embodiment, the compound corresponding to the rare earth metal includes lanthanum salt, cerium salt, and praseodymium salt, wherein the lanthanum salt may be lanthanum nitrate, the cerium salt may be cerium nitrate, and the praseodymium salt may be praseodymium nitrate.
[0048] In one embodiment, the organic ligand includes any one of ethylenediamine, dimethyldiethylamine, diethylenetriamine, and acetylacetone.
[0049] In one embodiment, the molar ratio of the compound corresponding to the rare earth metal, the organic ligand and deionized water is 1:8-30:350-600. For example, the molar ratio of the compound corresponding to the rare earth metal, the organic ligand and deionized water is 1:4:400, 1:8:500, 1:12:550.
[0050] In one embodiment, the mixing can be carried out by magnetic stirring, and the stirring time is 120-360 minutes.
[0051] S4. Mix the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water to obtain a mixed solution.
[0052] In one embodiment, the molar ratio of the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water is 1: 0.001-0.005: 0.002-0.006: 70-100. For example, the molar ratio of the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water is 1: 0.003: 0.004: 80, 1: 0.002: 0.003: 90, 1: 0.004: 0.005: 95.
[0053] In one embodiment, the mixing may be performed by rotary stirring, and the stirring time is 30-90 minutes.
[0054] S5. Evaporating, calcining and reducing the mixed solution to obtain a catalyst for room temperature oxidation and detritium removal.
[0055] In one embodiment, the rotary evaporation can be performed using equipment well known to those skilled in the art. Preferably, a rotary evaporator is used, the rotation speed is 30-70 rpm, the evaporation temperature is 50-80° C., and the evaporation vacuum is 50-250 hPa. Here, the evaporation step includes: the mixed solution is completely evaporated using a rotary evaporator to obtain metal-loaded γ-Al2O3.
[0056] In one embodiment, after evaporation and before calcination, a drying step may be further included, and the drying may be performed using equipment well known to those skilled in the art. Preferably, an oven is used, the drying temperature is 50-100° C., and the drying time is 8-12 hours.
[0057] In one embodiment, the steps of calcining and reducing the metal-loaded γ-Al2O3 include: first, calcining the metal-loaded γ-Al2O3 at 400-600°C for 4-8h in an air atmosphere; then reducing the calcined metal-loaded γ-Al2O3 at 300-500°C for 2-6h in a reducing atmosphere to obtain a catalyst for room temperature oxidation and detritium removal. The first calcination is to remove organic ligands, and both the noble metal salt and the rare earth metal salt become oxides. After heating and reduction, the noble metal oxide becomes a noble metal element, and the rare earth oxide is still an oxide because it cannot be reduced. At the same time, calcination can remove the organic components in γ-Al2O3, thereby exposing active metal clusters. Among them, the reducing atmosphere is a 5%-15% H2 / Ar mixed gas.
[0058] The particle catalyst prepared by the present invention can achieve a catalytic oxidation conversion rate of 99.9% for hydrogen (simulated tritium gas) at room temperature (-25°C). When the particle catalyst prepared by the present invention is used for hydrogen isotope catalytic oxidation, the catalytic performance does not decay after intermittent continuous cycle operation for more than 5 times.
[0059] The present invention adopts a simple rotary evaporation preparation process and uses commercial γ-Al2O3 particles as catalyst carriers, which reduces the production cost of the catalyst and makes it suitable for large-scale promotion. Since it can efficiently catalyze the oxidation of tritium at room temperature, the catalyst is applicable in a variety of application scenarios, broadening its market prospects.
[0060] The present invention is described in detail below by way of examples and experimental examples, but these are merely examples and do not limit the present invention in any form.
[0061] Example 1
[0062] This embodiment provides a method for preparing a catalyst for room temperature oxidation detritium removal, comprising the following steps:
[0063] Step 1: The γ-Al2O3 particles are first rinsed with deionized water until the water is clear and free of obvious impurities, then dried at 100°C for 5 hours, and finally calcined at 650°C for 8 hours to obtain a γ-Al2O3 carrier;
[0064] Step 2: Stir platinum dichloride, ethylenediamine and deionized water for 240 minutes to obtain a noble metal complex solution; wherein the ratio of platinum dichloride, ethylenediamine and deionized water is 1:15:600;
[0065] Step 3: Stir lanthanum nitrate, ethylenediamine and deionized water for 240 minutes to obtain a noble metal complex solution; wherein the ratio of lanthanum nitrate, ethylenediamine and deionized water is 1:15:600;
[0066] Step 4: Rotate and stir the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water for 90 minutes to obtain a mixed solution;
[0067] Step 5: Use a rotary evaporator to perform rotary evaporation on the mixed liquid. The vacuum degree during the rotary evaporation process is 250hPa; the temperature is 80℃. Then dry it in a 100℃ oven for 12h. Finally, calcine the dried γ-Al2O3 particles at 600℃ in an air atmosphere for 6h, and then reduce the calcined γ-Al2O3 particles at 400℃ in a reducing atmosphere for 4h to obtain a catalyst that can be used for oxidation and detritium removal; wherein the reducing atmosphere is a 5%-15% H2 / Ar mixed gas. The Pt loading of the prepared catalyst is 0.3%. The catalyst has an air velocity of 12000h at room temperature of 25℃. -1 When the hydrogen-containing mixed gas 1000ppm H2+5000ppm O2+N2 is oxidized, the hydrogen conversion rate is still greater than 99% within 50h. Figure 1 shown.
[0068] Example 2
[0069] This embodiment provides a method for preparing a catalyst for room temperature oxidation detritium removal, comprising the following steps:
[0070] Step 1: The γ-Al2O3 particles are first rinsed with deionized water until the water is clear and free of obvious impurities, then dried at 100°C for 5 hours, and finally calcined at 650°C for 8 hours to obtain a γ-Al2O3 carrier;
[0071] Step 2: Stir platinum dichloride, ethylenediamine and deionized water for 240 minutes to obtain a noble metal complex solution; wherein the ratio of platinum dichloride, ethylenediamine and deionized water is 1:15:600;
[0072] Step 3: stirring cerium nitrate, ethylenediamine and deionized water for 240 minutes to obtain a noble metal complex solution; wherein the ratio of cerium nitrate, ethylenediamine and deionized water is 1:15:600;
[0073] Step 4: Rotate and stir the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water for 90 minutes to obtain a mixed solution;
[0074] Step 5: The mixed solution is subjected to rotary evaporation using a rotary evaporator, and the vacuum degree during the rotary evaporation process is 250hPa; the temperature is 80°C. Then, the mixture is dried in a 100°C oven for 12 hours, and finally, the dried γ-Al2O3 particles are first calcined at 600°C in an air atmosphere for 6 hours, and then the calcined γ-Al2O3 particles are reduced at 400°C in a reducing atmosphere for 4 hours to obtain a catalyst that can be used for oxidative detritium removal; wherein the reducing atmosphere is a 5%-15% H2 / Ar mixed gas. Figure 2 HAADF-EDS graph of the prepared catalyst.
[0075] Example 3
[0076] This embodiment provides a method for preparing a catalyst for room temperature oxidation detritium removal, comprising the following steps:
[0077] Step 1: The γ-Al2O3 particles are first rinsed with deionized water until the water is clear and free of obvious impurities, then dried at 100°C for 5 hours, and finally calcined at 650°C for 8 hours to obtain a γ-Al2O3 carrier;
[0078] Step 2: Stir platinum dichloride, ethylenediamine and deionized water for 240 minutes to obtain a noble metal complex solution; wherein the ratio of platinum dichloride, ethylenediamine and deionized water is 1:15:600;
[0079] Step 3: stirring praseodymium nitrate, ethylenediamine and deionized water for 240 minutes to obtain a noble metal complex solution; wherein the ratio of praseodymium nitrate, ethylenediamine and deionized water is 1:15:600;
[0080] Step 4: Rotate and stir the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water for 90 minutes to obtain a mixed solution;
[0081] Step 5: The mixed solution is subjected to rotary evaporation using a rotary evaporator, and the vacuum degree during the rotary evaporation process is 250hPa; the temperature is 80°C. Then, the mixture is dried in a 100°C oven for 12 hours, and finally, the dried γ-Al2O3 particles are first calcined at 600°C in an air atmosphere for 6 hours, and then the calcined γ-Al2O3 particles are reduced at 400°C in a reducing atmosphere for 4 hours to obtain a catalyst that can be used for oxidative detritium removal; wherein the reducing atmosphere is a 5%-15% H2 / Ar mixed gas. Figure 3 It shows that the prepared catalyst has a space velocity of 12000h at room temperature of 25℃ -1 When the hydrogen-containing mixed gas of 1000ppm H2+5000ppm O2+N2 was intermittently tested, the hydrogen conversion rate was still greater than 99% within 17 days.
[0082] Comparative Example 1
[0083] The catalyst in Example 1 and the commercial Pt / γ-Al2O3 catalyst were reacted at different temperatures with a space velocity of 12000 h -1 The comparison of oxidation performance of hydrogen-containing mixed gas 1000ppm H2+Air is shown in the figure below. Figure 4 The results show that the prepared catalyst can achieve high conversion rate results under room temperature conditions.
[0084] Result analysis:
[0085] Table 1. Conversion rate results of the catalyst prepared in Example 1 for three types of gases at different temperatures
[0086]
[0087] As shown in Table 1: The prepared rare earth metal (lanthanum) oxide and precious metal (platinum) supported γ-Al2O3 catalyst has a conversion rate of 96.5% for 1000ppm H2+Air gas containing hydrogen at room temperature (25°C), and as the temperature is slightly increased to above 30°C, the conversion rate can reach above 99.9%. The same material can achieve a conversion rate of more than 99.9% for the catalytic oxidation of the other two types of gases at room temperature (25°C).
[0088] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A catalyst for room temperature oxidation detritium removal, characterized in that: include: A carrier and a noble metal-rare earth metal oxide nanoclusters loaded on the carrier; wherein the carrier is γ-Al2O3.
2. The catalyst for room temperature oxidation detritium according to claim 1, characterized in that: The noble metal includes platinum and / or palladium.
3. The catalyst for room temperature oxidation detritium according to claim 1, characterized in that: The rare earth metal includes one or more of lanthanum, cerium and praseodymium.
4. The method for preparing a catalyst for room temperature oxidation detritium according to any one of claims 1 to 3, characterized in that: include: Pre-treating the γ-Al2O3 to remove impurities in the γ-Al2O3 to obtain a γ-Al2O3 carrier; Mixing a compound corresponding to the noble metal, an organic ligand and deionized water to obtain a noble metal complex solution; Mixing a compound corresponding to the rare earth metal, an organic ligand and deionized water to obtain a rare earth metal complex solution; Mixing a γ-Al2O3 carrier, a noble metal complex solution, a rare earth metal complex solution and deionized water to obtain a mixed solution; The mixed solution is evaporated, calcined and reduced to obtain a catalyst for room temperature oxidation and detritium removal.
5. The preparation method according to claim 4, characterized in that: The step of pre-treating the γ-Al2O3 comprises: calcining the purchased commercial γ-Al2O3 at 450-650°C for 8-12 hours.
6. The preparation method according to claim 4, characterized in that: The compound corresponding to the noble metal includes platinum salt and / or palladium salt, wherein: The platinum salt includes one or more of platinum dichloride, chloroplatinic acid, and sodium chloroplatinate; The palladium salt includes one or more of palladium dichloride and sodium chloropalladate; The compound corresponding to the rare earth metal includes one or more of lanthanum salt, cerium salt and praseodymium salt, wherein: The lanthanum salt is lanthanum nitrate; The cerium salt is cerium nitrate; The praseodymium salt is praseodymium nitrate.
7. The preparation method according to claim 4, characterized in that: The organic ligand includes any one of ethylenediamine, dimethyldiethylamine, diethylenetriamine and acetylacetone.
8. The preparation method according to claim 4, characterized in that: The molar ratio of the compound corresponding to the noble metal, the organic ligand and the deionized water is 1:3-15:350-600; The molar ratio of the compound corresponding to the rare earth metal, the organic ligand and the deionized water is 1:8-30:350-600; The molar ratio of the γ-Al2O3 carrier, the noble metal complex solution, the rare earth metal complex solution and deionized water is 1: 0.001-0.005: 0.002-0.006: 70-100.
9. The preparation method according to claim 4, characterized in that: The evaporation is performed using a rotary evaporator, the evaporation temperature is 50-80°C, and the evaporation vacuum is 50-250hPa; The evaporation step comprises: the mixed liquid is completely evaporated by a rotary evaporator to obtain metal-loaded γ-Al2O3.
10. The preparation method according to claim 9, characterized in that: The steps of calcining and reducing the metal-loaded γ-Al2O3 include: The calcination step comprises: calcining the metal-loaded γ-Al2O3 at 400-600°C for 4-8h in an air atmosphere; The reduction step comprises: reducing the calcined metal-loaded γ-Al2O3 at 300-500°C for 2-6h under a reducing atmosphere to obtain a catalyst for room temperature oxidation and detritium removal.