FePt alloy supported catalyst as well as preparation method and application thereof

Abstract

The invention belongs to the field of VOCs catalysts, and discloses a FePt alloy supported catalyst and a preparation method and application thereof.The preparation method includes the steps that an aqueous solution containing Fe salt and precious metal Pt salt serves as a precursor solution, an inert carrier is added into the precursor solution, the precursor is supported on the carrier through an impregnation method, and viscous liquid is obtained; heating the viscous liquid to obtain powder; and calcining the powder to obtain the FePt alloy supported catalyst. The prepared catalyst is in a nano-particle shape, can show good propane degradation performance at a low temperature, also has strong sulfur poisoning resistance, still keeps high activity in a sulfur-containing atmosphere with the concentration as high as 500 ppm, and is a good sulfur-resistant VOCs catalytic material.

Description

Technical Field

[0001] The invention relates to the technical field of catalytic oxidation removal of low-carbon alkanes, and in particular to a FePt alloy supported catalyst and a preparation method and application thereof. Background Art

[0002] Volatile Organic Compounds (VOCs) are a class of organic compounds with low boiling points and easy volatility. Generally speaking, they refer to organic compounds with a saturated vapor pressure greater than 133.32 Pa at room temperature, a boiling point between 50 and 260°C, or high volatility at normal pressure. There are many types of VOCs, among which low-carbon alkanes are an important component. It refers to saturated hydrocarbon compounds with a small number of carbon atoms, usually including methane, ethane, propane and butane. This type of compound has high volatility and chemical stability. The main hazards of low-carbon alkanes are reflected in their impact on the environment and climate. On the one hand, low-carbon alkanes can participate in photochemical reactions in the atmosphere and react with nitrogen oxides (NO x ) generates ozone, becoming the main precursor of photochemical smog, seriously affecting the quality of the atmosphere; on the other hand, low-carbon alkanes such as methane have a high greenhouse effect potential (GWP) and are one of the important greenhouse gases that cause global warming. At present, the most commonly used and effective method for treating low-carbon alkanes is catalytic combustion, which uses catalysts to reduce the activation energy of the oxidation reaction of organic matter, thereby accelerating the reaction rate, allowing the oxidation reaction to proceed in the form of flameless combustion at a lower temperature, and ultimately generating harmless products such as CO2 and H2O.

[0003] At present, precious metal-based catalysts are the most frequently used catalysts for the catalytic combustion of low-carbon alkanes. This type of catalyst has the advantages of good low-temperature activity and low ignition temperature, but it inevitably has disadvantages such as poor toxicity resistance, easy sintering and agglomeration, and high price. In actual application, the exhaust gas emitted by some special industrial processes often has complex components and may contain some sulfur-containing toxic gases, such as hydrogen sulfide and sulfur dioxide. These sulfur-containing gases easily occupy the active sites on the precious metal catalyst and poison and deactivate them, thereby reducing the catalytic combustion efficiency of the catalyst. Therefore, designing precious metal catalysts with high toxicity resistance has important research significance and practical application value. Summary of the invention

[0004] In order to solve the problem of easy poisoning and deactivation of catalysts used for catalytic combustion of light alkanes in the prior art, the purpose of the present invention is to provide a FePt alloy supported catalyst and a preparation method and application thereof, wherein the catalyst still maintains good propane degradation activity in a propane atmosphere containing a high concentration of H2S and has the characteristics of high toxicity resistance and stability.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The first aspect of the present invention provides a method for preparing a FePt alloy supported catalyst, comprising the following steps:

[0007] An aqueous solution containing Fe salt and noble metal Pt salt is used as a precursor solution, an inert carrier is added to the precursor solution, and the precursor is loaded onto the carrier by an impregnation method to obtain a viscous liquid;

[0008] The viscous liquid is heated to obtain a powder;

[0009] The powder is calcined to obtain a FePt alloy supported catalyst.

[0010] Furthermore, the Fe salt is ferric nitrate nonahydrate, ferric acetate or ferric acetylacetonate.

[0011] Furthermore, the noble metal Pt salt is tetraammine platinum nitrate, ruthenium trichloride, rhodium trichloride, palladium chloride or gold chloride.

[0012] Furthermore, the inert carrier is fumed silica or γ-Al2O3.

[0013] Furthermore, the concentration of the Fe salt in the precursor solution is 0.25-0.0125 mol / L, and the usage ratio of the Fe salt to the fumed silica is 0.072 mL: 1 g.

[0014] Furthermore, the mass ratio of Fe to Pt is 0.005-0.5:1.

[0015] Furthermore, the calcination temperature is 450-500° C., the time is 4-6 hours, and the calcination atmosphere is a hydrogen-argon mixed gas.

[0016] Further, the temperature is increased from room temperature to 450-500°C at a heating rate of 5-10°C / min.

[0017] The second aspect of the present invention provides a FePt alloy supported catalyst, wherein the particle size of the catalyst is below 5 nm.

[0018] The third aspect of the present invention provides an application of a FePt alloy supported catalyst in the catalytic oxidation removal of low carbon alkanes (methane, ethane, propane and butane).

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention synthesizes FePt / SiO2 alloy catalysts with different Fe contents by adjusting the concentration of Fe salt solution using an impregnation method. Compared with general single noble metal supported catalysts, the FePt alloy supported catalyst prepared by the present invention has the advantage that Pt is selected as a representative of noble metal-based catalysts, and after calcination, Pt and Fe metal ions are reduced to a single state and an alloy structure is formed, which changes the electron cloud state around the active site Pt, exposes more effective active sites, and activates surface active adsorption oxygen; the large specific surface area of ​​SiO2 can also allow alloy nanoparticles to be evenly dispersed thereon, with a particle size of less than 5nm, thereby improving the catalyst's catalytic oxidation ability for propane. At the same time, the electronic tempering effect of the alloy structure between Pt and Fe is used to weaken the adsorption and deposition of sulfur-containing substances on the catalyst surface, thereby effectively coping with the poisoning of sulfur-containing substances hydrogen sulfide in the mixed gas to the catalyst, and achieving an anti-sulfur effect. Compared with existing studies, the present invention has simple steps for preparing catalysts, controllable costs, and has a very large application prospect.

[0021] The FePt / SiO2 catalyst prepared by the present invention was subjected to structural characterization, catalytic performance test, sulfur resistance test and redox analysis, and the relationship between alloy structure and catalytic performance was explored. By selecting an inert material such as fumed silica as a carrier, the advantage of the large specific surface area of ​​the carrier is utilized, and a nanomaterial with uniform distribution of supported metals can be prepared in a short time. When the Fe content is 0.01wt%, FePt / SiO2 has the highest surface active oxygen content, which promotes the adsorption and activation of propane, making the C-H bond in propane easier to break on the catalyst surface, and reducing the energy barrier of the reaction. At the same time, due to the alloy structure formed by FePt, the adsorption and deposition of hydrogen sulfide are hindered. The alloy-supported catalyst has good catalytic oxidation performance and sulfur resistance, and has good scalability and application prospects.

[0022] The 0.01% FePt / SiO2 alloy supported catalyst prepared by the present invention is heated at 120-240°C and a space velocity of 20000 h –1 Under the condition of total flow rate of 50mL / min, catalytic oxidation of 500ppm propane is achieved at 210℃. The presence of hydrogen sulfide does not have a significant effect on the propane oxidation activity of the material. When coexisting with 250ppm H2S, the propane conversion rate remains at about 90%, indicating that the catalyst prepared by the present invention has good stability. The present invention has important application prospects in the field of low-temperature purification of volatile organic pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Scanning electron microscope images of Pt / SiO2; wherein, (a) is a STEM image, (b) is an EDS-mapping image of the Pt element, (c) is an EDS-mapping image of the O element, (d) is an EDS-mapping image of the Si element, and (e) is an HRTEM image;

[0024] Figure 2 Scanning electron microscope images of 0.01% FePt / SiO2; wherein, (a) is a STEM image, (b) an EDS-mapping image of the Pt element, (c) an EDS-mapping image of the Fe element, (d) an EDS-mapping image of the O element, (e) an EDS-mapping image of the Si element, and (f) an HRTEM image;

[0025] Figure 3 XRD patterns of FePt / SiO2 catalytic materials with different Fe contents;

[0026] Figure 4 This is the degradation performance diagram of FePt / SiO2 catalytic materials with different Fe contents for propane;

[0027] Figure 5 This is a propane degradation performance diagram of 0.01% FePt / SiO2 catalytic material in the presence of hydrogen sulfide;

[0028] Figure 6 This is the O2-TPD diagram of Pt / SiO2 and 0.01%FePt / SiO2 catalytic materials. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0030] The preparation method of the FePt alloy supported catalyst of the present invention adopts an impregnation method to prepare a single precious metal Pt supported catalyst and a FePt alloy supported catalyst, uses ferric nitrate nonahydrate as an Fe precursor, tetraammine platinum nitrate as a Pt precursor, uses gas phase SiO2 as a carrier, and loads Pt or Fe and Pt onto the SiO2 carrier by a co-impregnation method.

[0031] The specific preparation method comprises the following steps:

[0032] (1) Add 1 g of Pt(NH3)4(NO3)2 into 200 mL of deionized water, stir and shake thoroughly to obtain a transparent and clear solution with a concentration of 0.013 mol / L;

[0033] (2) Add 5 g of Fe(NO3)3·9H2O to 10 mL of deionized water and shake evenly to obtain a lavender transparent solution with a concentration of 1.25 mol / L; dilute the solution according to different Fe loadings to obtain a solution with a concentration of 0.0125-0.25 mol / L, preferably 0.25, 0.025 or 0.0125 mol / L.

[0034] (3) 3.972 mL of the solution obtained in step (1) and 0.072 mL of the solution obtained in step (2) were mixed and stirred evenly, 1 g of gaseous SiO2 was added thereto, and the mixture was stirred thoroughly to obtain a viscous liquid mixture; the viscous liquid mixture was heated in a water bath until the viscous liquid was dried to a powder state; the powder was dried and calcined to obtain FePt / SiO2 alloy-supported catalysts with different ratios.

[0035] In the present invention, the theoretical loading amount of Pt is 1 wt %.

[0036] Among them, the mass ratio of Fe to Pt is x:1 (x=0.005-0.5:1, preferably 0.005, 0.01, 0.1 or 0.5), which are named 0.005% FePt / SiO2, 0.01% FePt / SiO2, 0.1% FePt / SiO2 and 0.5% FePt / SiO2 respectively.

[0037] The FePt alloy supported catalyst prepared by the present invention can be effectively applied to the catalytic oxidation removal of low carbon alkanes. Specifically, the catalyst is heated at 120-220°C and at a space velocity of 20000 h –1 , under the condition of total flow rate of 50mL / min, catalytic oxidation of 500ppm propane was achieved. The catalytic oxidation temperature of catalytic oxygen for low carbon alkanes was lower than 250℃.

[0038] The presence of hydrogen sulfide does not have a significant effect on the propane activity of the 0.01% FePt / SiO2 catalyst. When coexisting with 250ppm H2S, the propane conversion rate remains at around 90%, indicating that the catalyst prepared using this invention has good stability.

[0039] The following are specific embodiments.

[0040] Comparative Example 1 Preparation of single precious metal loaded Pt / SiO2 catalyst by impregnation method

[0041] Add 1g of fumed silica to 3.972mL of 0.013mol / L Pt(NH3)4(NO3)2 solution and stir thoroughly and soak for 24h. Then heat the mixture to 60℃ in a water bath until the viscous liquid turns into powder. Dry the powder at 80℃ for 8h to obtain the precursor of the catalyst, and then calcine it at 450℃ in a hydrogen atmosphere with a heating rate of 10℃ / min for 4h to obtain a supported single precious metal catalyst, recorded as Pt / SiO2.

[0042] from Figure 1 (a)-(e) and Figure 3 It can be seen that the catalyst prepared in Comparative Example 1 has a regular nanoparticle structure with a particle size below 5 nm, and there is no obvious peak of the precious metal Pt in the XRD graph, which proves that the precious metal is evenly dispersed.

[0043] Example 1 Preparation of 0.005% FePt / SiO2 alloy catalyst by impregnation method

[0044] 3.972mL of 0.013mol / L Pt(NH3)4(NO3)2 solution was mixed with 0.072mL of 0.0125mol / L Fe(NO3)3·9H2O solution. After mixing evenly, 1g of fumed silica was added and stirred thoroughly and soaked for 24h. Then the mixture was heated to 60°C in a water bath until the viscous liquid turned into a powder state. The powder was dried at 80°C for 8h to obtain the precursor of the alloy catalyst, and then calcined for 4h at 450°C in a hydrogen-argon mixed gas (hydrogen volume percentage of 5%), at a heating rate of 10°C / min, to obtain a supported FePt alloy catalyst, recorded as 0.005% FePt / SiO2, with the mass fraction of Fe in the carrier being 0.005%.

[0045] Example 2 Preparation of 0.01% FePt / SiO2 alloy catalyst by impregnation method

[0046] 3.972mL of 0.013mol / L Pt(NH3)4(NO3)2 solution was mixed with 0.072mL of 0.025mol / L Fe(NO3)3·9H2O solution. After mixing evenly, 1g of fumed silica was added and stirred thoroughly and soaked for 24h. Then the mixture was heated to 60°C in a water bath until the viscous liquid turned into a powder state. The powder was dried at 80°C for 8h to obtain the precursor of the alloy catalyst, and then calcined for 4h at 450°C in a hydrogen-argon mixed gas (hydrogen volume percentage of 10%), at a heating rate of 10°C / min, to obtain a supported FePt alloy catalyst, recorded as 0.01% FePt / SiO2, with the mass fraction of Fe in the carrier being 0.01%.

[0047] from Figure 2 As can be seen from (a)-(f), the catalyst prepared in Example 3 is a regular nanoparticle structure with a particle size of less than 5 nm. It can be seen from the EDS graph that Pt and Fe nanoparticles exist at the same location, proving that an alloy is formed; there are no obvious peaks of precious metals Pt and Fe in the XRD graph, proving that the two metals are evenly dispersed.

[0048] Example 3 Preparation of 0.1% FePt / SiO2 alloy catalyst by impregnation method

[0049] 3.972mL of 0.013mol / L Pt(NH3)4(NO3)2 solution was mixed with 0.072mL of 0.25mol / L Fe(NO3)3·9H2O solution. After mixing evenly, 1g of fumed silica was added and stirred thoroughly and soaked for 24h. Then the mixture was heated to 60°C in a water bath until the viscous liquid turned into a powder state. The powder was dried at 80°C for 8h to obtain the precursor of the alloy catalyst, and then calcined for 4h at 450°C in a hydrogen-argon mixed gas (hydrogen volume percentage of 5%), at a heating rate of 10°C / min, to obtain a supported FePt alloy catalyst, recorded as 0.1% FePt / SiO2, with the mass fraction of Fe in the carrier being 0.1%.

[0050] Example 4 Preparation of 0.5% FePt / SiO2 alloy catalyst by impregnation method

[0051] 3.972mL of 0.013mol / L Pt(NH3)4(NO3)2 solution was mixed with 0.072mL of 1.25mol / L Fe(NO3)3·9H2O solution. After mixing evenly, 1g of fumed silica was added and stirred thoroughly and soaked for 24h. Then the mixture was heated to 60°C in a water bath until the viscous liquid turned into a powder state. The powder was dried at 80°C for 8h to obtain the precursor of the alloy catalyst, and then calcined for 4h at 450°C in a hydrogen-argon mixed gas (hydrogen volume percentage of 10%), at a heating rate of 10°C / min, to obtain a supported FePt alloy catalyst, recorded as 0.5% FePt / SiO2, with the mass fraction of Fe in the carrier being 0.5%.

[0052] Example 5

[0053] A 0.013 mol / L ruthenium chloride solution was mixed with 0.072 mL of a 0.25 mol / L ferric acetate solution, with a mass ratio of Fe to Ru of 0.005:1. After mixing evenly, 1 g of γ-Al2O3 was added and stirred thoroughly and soaked for 24 hours. The mixture was then heated to 60°C in a water bath until the viscous liquid turned into a powder state. The powder was dried at 80°C for 8 hours to obtain the precursor of the alloy catalyst, and then calcined for 4 hours at 500°C in a hydrogen-argon mixture (hydrogen volume percentage of 7%) at a heating rate of 5°C / min to obtain a supported FePt alloy catalyst.

[0054] Example 6

[0055] A rhodium trichloride solution with a concentration of 0.013 mol / L is mixed with 0.072 mL of ferric acetylacetonate solution with a concentration of 0.25 mol / L, and the mass ratio of Fe to Rh is 0.005:1. After mixing evenly, 1 g of fumed silica is added and stirred thoroughly and immersed for 24 hours. Then the mixture is heated to 60°C in a water bath until the viscous liquid becomes a powder state. The powder is dried at 80°C for 8 hours to obtain the precursor of the alloy catalyst, and then calcined for 6 hours at 450°C in a hydrogen-argon mixed gas (hydrogen volume percentage is 8%), with a heating rate of 10°C / min, to obtain a supported FePt alloy catalyst.

[0056] Example 7

[0057] A 0.013 mol / L palladium chloride solution was mixed with 0.072 mL of a 1.25 mol / L Fe(NO3)3·9H2O solution, with a mass ratio of Fe to Pd of 0.03:1. After mixing evenly, 1 g of fumed silica was added and stirred thoroughly and soaked for 24 hours. The mixture was then heated to 60°C in a water bath until the viscous liquid turned into a powder state. The powder was dried at 80°C for 8 hours to obtain the precursor of the alloy catalyst, and then calcined for 5 hours at 470°C in a hydrogen-argon mixed gas (hydrogen volume percentage of 9%), with a heating rate of 7°C / min, to obtain a supported FePt alloy catalyst.

[0058] Example 8

[0059] Mix 0.013 mol / L gold chloride solution with 0.072 mL of 0.25 mol / L Fe(NO3)3·9H2O solution, with a mass ratio of Fe to Au of 0.5:1. After mixing evenly, add 1 g of fumed silica and stir thoroughly, and soak for 24 hours. Then heat the mixture to 60°C in a water bath until the viscous liquid turns into a powder state. Dry the powder at 80°C for 8 hours to obtain the precursor of the alloy catalyst, and then calcine it at 470°C in a hydrogen-argon mixed gas (hydrogen volume percentage is 10%), with a heating rate of 7°C / min for 5 hours to obtain a supported FePt alloy catalyst.

[0060] Example 9 Catalytic Degradation Activity of Propane in FePt / SiO2 Alloy Catalysts with Different Fe Contents

[0061] The catalysts obtained in Examples 1-4 and Comparative Example 1 were tableted and sieved (40-60 meshes), and 0.15 g of the sieved catalyst was accurately weighed and placed in a fixed bed reactor for propane catalytic oxidation activity evaluation. Propane was used as the probe gas, the propane volume concentration was 500 ppm, the O2 volume concentration was 21%, N2 was the balance gas, the total gas flow rate was 50 mL / min, and the reaction space velocity was 20000 h –1 The catalytic activity of the catalyst at temperatures of 100°C to 350°C was tested, and propane was monitored and analyzed by gas chromatography. The activity of the catalyst at different temperatures is shown in Figure 4 .

[0062] from Figure 4 The analysis shows that the FePt alloy supported catalysts with different Fe contents prepared in the present invention all show excellent low-temperature degradation efficiency for propane. Compared with the single precious metal catalyst, as the Fe content increases, the degradation ability of the alloy catalyst for propane first increases and then decreases. When the Fe content is 0.01wt%, the degradation performance of the catalyst is the best. –1 Under the conditions of 500 ppm propane and 50 mL / min gas total flow rate, the complete oxidation of 500 ppm propane was achieved. However, the Pt / SiO2 catalyst loaded with a single precious metal could only completely oxidize propane at 280°C.

[0063] from Figure 6 It can be seen from O2-TPD that 0.01% FePt / SiO2 has more surface active oxygen adsorption than Pt / SiO2, and propane is more easily oxidized on the catalyst surface, thus showing better catalytic oxidation performance.

[0064] Example 10 Sulfur resistance test of single precious metal loaded Pt / SiO2 and 0.01% FePt / SiO2 alloy catalytic materials

[0065] The catalysts obtained in Comparative Example 1 and Example 2 were tableted and sieved (40-60 mesh), and 0.15 g of the sieved catalyst was accurately weighed and placed in a fixed bed reactor for propane catalytic oxidation activity evaluation. Propane was used as the probe gas, the propane volume concentration was 500 ppm, the O2 volume concentration was 21%, N2 was the balance gas, the total gas flow rate was 50 mL / min, and the reaction space velocity was 20000 h –1 After the reaction temperature stabilized at 210°C, 250ppm H2S was introduced to continuously test the catalytic activity of the catalyst under the mixed component atmosphere. After 24 hours, H2S was cut off and the catalytic activity of the catalytic material was continuously tested until it stabilized.

[0066] See also Figure 5 ,from Figure 5 The results show that the 0.01% FePt / SiO2 catalyst of the present invention has good sulfur resistance and still exhibits good catalytic oxidation ability for propane in the presence of 250ppm H2S.

[0067] The present invention uses an impregnation method to mix an Fe salt solution with a Pt salt solution, add a gas phase SiO2 carrier, and after impregnation for 24 hours, obtain a viscous liquid, stir and dry it at 60°C to a powder, and then dry it at 80°C and calcine it at 450-500°C in a hydrogen-argon mixed atmosphere for 4-6 hours to obtain a series of FePt / SiO2 alloy supported catalysts with different Fe contents. The alloy supported catalyst prepared by the present invention has good active site dispersion, high surface active adsorbed oxygen content, strong redox performance and excellent sulfur resistance. The catalyst is applied to propane oxidation reaction. Compared with the single precious metal Pt / SiO2 catalyst, the variable valence state of Fe in the FePt alloy and the low temperature oxidation performance of Pt bring stronger redox ability to the catalyst, and the rich surface active adsorbed oxygen of the alloy material accelerates the breaking of the C-H bond; the formed FePt alloy structure changes the electron cloud state around the active site Pt, activates more propane adsorption active sites, and improves the catalyst's catalytic oxidation ability for propane. In addition, the electronic modulation of the alloy structure weakens the adsorption of H2S on the surface of the material and the deposition of sulfate, and also brings excellent sulfur resistance to the catalyst. The preparation method of the FePt alloy supported catalyst prepared by the present invention is simple, the method has high economic efficiency, and improves the performance and stability through modification, which significantly improves its potential for industrial application.

[0068] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. However, all changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

Claims

1. A method for preparing a FePt alloy supported catalyst, characterized in that: The following steps are involved: An aqueous solution containing Fe salt and noble metal Pt salt is used as a precursor solution, an inert carrier is added to the precursor solution, and the precursor is loaded onto the carrier by an impregnation method to obtain a viscous liquid; The viscous liquid is heated to obtain a powder; The powder is calcined to obtain a FePt alloy supported catalyst.

2. The method for preparing a FePt alloy supported catalyst according to claim 1, characterized in that: The Fe salt is ferric nitrate nonahydrate, ferric acetate or ferric acetylacetonate.

3. The method for preparing the FePt alloy supported catalyst according to claim 1, characterized in that: The noble metal Pt salt is tetraammine platinum nitrate, ruthenium trichloride, rhodium trichloride, palladium chloride or gold chloride.

4. The method for preparing a FePt alloy supported catalyst according to claim 1, characterized in that: The inert carrier is fumed silica or γ-Al2O3.

5. The method for preparing the FePt alloy supported catalyst according to claim 4, characterized in that: The concentration of Fe salt in the precursor solution is 0.25-0.0125 mol / L, and the dosage ratio of Fe salt to fumed silica is 0.072 mL:1 g.

6. The method for preparing a FePt alloy supported catalyst according to claim 1, characterized in that: The mass ratio of Fe to Pt is 0.005-0.5:

1.

7. The method for preparing a FePt alloy supported catalyst according to claim 1, characterized in that: The calcination temperature is 450-500°C, the time is 4-6h, and the calcination atmosphere is a hydrogen-argon mixed gas.

8. The method for preparing a FePt alloy supported catalyst according to claim 7, characterized in that: The temperature was raised from room temperature to 450-500°C at a heating rate of 5-10°C / min.

9. A FePt alloy supported catalyst prepared by the method according to any one of claims 1 to 8, characterized in that: The particle size of the catalyst is below 5 nm.

10. Use of a FePt alloy supported catalyst prepared by the method according to any one of claims 1 to 8 in the catalytic oxidation removal of light alkanes.

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