Metal catalytic combustion catalyst and preparation method and application thereof

Abstract

The invention relates to the technical field of catalytic combustion of civil gas, and discloses a metal catalytic combustion catalyst as well as a preparation method and application thereof. The metal catalytic combustion catalyst comprises a metal carrier and active components arranged on the surface of the metal carrier, the active components comprise metal oxides and precious metals, the metal oxides are one or more of manganese oxides, titanium oxides, yttrium oxides, cobalt oxides and tin oxides, and the precious metals are precious metals. The precious metal is one or more of platinum, palladium, rhodium and ruthenium or alloy, and the weight ratio of the precious metal to the metal oxide is 0.3: 11-1: 16.5. According to the metal catalytic combustion catalyst and the preparation method and application thereof disclosed by the invention, the maximum combustion temperature can reach 1100 DEG C or above, fuel gas can be completely combusted at the high temperature, and the metal catalytic combustion catalyst can be applied to the fields of fire supply of catering kitchens, outdoor heating, fuel gas soldering iron and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of catalytic combustion of civil fuel gas, and more specifically to a metal catalytic combustion catalyst, a preparation method of the metal catalytic combustion catalyst, and application of the metal catalytic combustion catalyst to catalytically combust fuel gas. Background Art

[0002] Catalytic combustion is flameless combustion under the action of a catalyst. Its principle is to reduce the activation energy of the reaction through the catalyst, so that the organic gas can be flameless burned at a relatively low temperature (usually 150-300°C), completely oxidized and decomposed into carbon dioxide and water, and release a large amount of heat.

[0003] At present, the main catalysts used in the market are divided into two categories: precious metal catalysts and non-precious metal catalysts. Precious metal catalysts such as platinum (Pt), palladium (Pd), rhodium (Rh), etc., although they have high catalytic activity, are expensive and scarce. Non-precious metal catalysts, such as copper (Cu) and manganese (Mn), etc., although low in cost, still have deficiencies in catalytic activity, stability and toxicity resistance. For example, copper-based catalysts are easily deactivated under high temperature conditions, while manganese-based catalysts are sensitive to impurities such as sulfur.

[0004] Based on the defects of existing catalysts, metal composite oxide catalysts are developed. This type of catalyst can achieve a synergistic effect by combining different metal elements, thereby improving the overall catalytic performance.

[0005] In addition, with the development of industry and commerce, some fields such as fire supply in restaurant kitchens, outdoor heating, gas soldering irons, etc. have derived some special needs. These fields have high requirements for the safe use of gas, require no open flame operations, and have strict requirements on the emission content of harmful gases. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0007] To this end, one purpose of the present invention is to propose a metal catalytic combustion catalyst, which is a metal composite oxide catalyst. During catalytic combustion, higher infrared radiation energy can be stimulated. This energy has penetrating properties and can accelerate heat transfer, thereby obtaining efficient heat and making the maximum combustion temperature reach above 1100°C. The fuel gas can be completely burned at this high temperature, emitting very little harmful gases such as CO and NOx, so that it can be used in the fields of fire supply in catering kitchens, outdoor heating, gas soldering irons, etc.

[0008] The metal catalytic combustion catalyst proposed in the present invention includes a metal carrier and an active component arranged on the surface of the metal carrier, the active component includes a metal oxide and a precious metal, the metal oxide is one or more of manganese oxide, titanium oxide, yttrium oxide, cobalt oxide, and tin oxide, the precious metal is one or more of platinum, palladium, rhodium, and ruthenium or an alloy, and the weight ratio of the precious metal to the metal oxide is 0.3:11 to 1:16.5.

[0009] In some examples of the present invention, the metal support is porous iron-chromium-aluminum.

[0010] In some examples of the present invention, the active component accounts for 0.01% to 0.20% by weight of the total weight of the catalyst.

[0011] Another object of the present invention is to provide a method for preparing a metal catalytic combustion catalyst. In this method, the metal oxide is first evenly distributed on an alloy carrier, and then the precious metal is loaded on the alloy carrier. A metal composite oxide catalyst is obtained through a simple preparation process. During the loading process of the metal oxide, its salt solution reacts with the alloy carrier simultaneously, so that the loading intensity and loading amount of the active ingredient are improved, thereby significantly improving the catalytic performance of the catalyst.

[0012] According to the method for preparing the metal catalytic combustion catalyst proposed by the present invention, the method is used to prepare the aforementioned metal catalytic combustion catalyst, which comprises:

[0013] Step S1: pre-treating the metal support to obtain a first intermediate;

[0014] Step S2: treating the first intermediate with a metal salt solution to obtain a second intermediate, wherein the metal element in the metal salt solution is the metal element in the metal oxide;

[0015] Step S3: loading a noble metal on the second intermediate to obtain a catalyst.

[0016] In some examples of the present invention, step S2 includes:

[0017] First, the first intermediate is placed in a metal salt solution, wherein the metal salt is one or more of cobalt salt, manganese salt, tin salt, titanium salt, and yttrium salt, the total concentration of metal ions in the solution is 0.1 to 10 mol / L, and the solution temperature is 60 to 100° C.;

[0018] Then take out the first intermediate and blow it out;

[0019] Then, the first intermediate is calcined, and after cooling, a second intermediate is obtained. The calcination temperature is 800 to 1000° C., and the calcination time is 15 to 30 minutes.

[0020] In some examples of the present invention, step S3 includes:

[0021] First, the second intermediate is immersed in a noble metal solution, the concentration of the noble metal ion is 0.010-0.100 mol / L, and the immersion time is 5 min;

[0022] Then the second intermediate is taken out and calcined to obtain a catalyst. The calcination temperature is 800-1000°C and the calcination time is 15-30 minutes. The purpose of calcination is to enable the noble metal ions to achieve a reduction reaction to generate a metal catalytic combustion catalyst.

[0023] In some examples of the present invention, in step S3, the solvent of the precious metal solution is an alcohol solvent, and the precious metal compound is selected from one or more of chloroplatinic acid, palladium chloride, platinum nitrate, palladium nitrate, rhodium trichloride, and ruthenium trichloride.

[0024] In some examples of the present invention, the alcohol solvent is one of methanol, ethanol, and isopropanol.

[0025] In some examples of the present invention, step S1 includes: first cleaning the surface of the metal carrier, then treating the metal carrier with a weak acid or weak base solution, and then taking it out and washing it with deionized water and drying it.

[0026] In some examples of the present invention, step S1 further includes: completely immersing the metal carrier in an alkaline or acidic solution with a concentration of 5% for treatment, the solution temperature is 40-80° C., and the immersion time is 1 min.

[0027] In some examples of the present invention, the alkaline solution is a sodium hydroxide solution, and the acidic solution is one or both of an oxalic acid solution and a nitric acid solution.

[0028] Another object of the present invention is to provide a method for catalytic combustion of fuel gas, which is intended to enable the fuel gas to be completely burned under the action of the aforementioned metal catalytic combustion catalyst.

[0029] The method for catalytic combustion of fuel gas proposed in the present invention comprises causing the fuel gas to undergo catalytic combustion reaction under the action of a supported catalyst, wherein the supported catalyst is the aforementioned metal catalytic combustion catalyst, or is prepared by the aforementioned preparation method of the metal catalytic combustion catalyst.

[0030] When this method is used to burn gas, the gas is heated to a certain temperature, and the molecules inside it begin to vibrate and generate energy. These vibrations cause changes in the dipole moments between molecules, so that the gas can absorb and emit infrared radiation. The higher the temperature, the higher the intensity and frequency of the emitted infrared radiation, thereby improving the decomposition efficiency of the gas, allowing it to burn completely, and producing very little harmful gases such as CO and NOx.

[0031] In some examples of the present invention, the metal carrier of the supported catalyst is porous iron-chromium-aluminum with a mesh size of 5 to 100 meshes and a thickness of 0.05 to 10 mm.

[0032] The metal catalytic combustion catalyst disclosed in the present application and its preparation method and application have the following advantages:

[0033] When the gas is catalytically burned, a very high combustion temperature can be generated, which can then decompose the gas very efficiently and thoroughly. The products formed are carbon dioxide and water, and almost no CO and NOx are produced. In addition, the metal catalytic combustion catalyst has good low-temperature activity performance, which can greatly improve the catalytic activity.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a photo of the metal catalytic combustion catalyst obtained in Example 1 of the present invention;

[0037] Figure 2 This is a photograph of the catalyst of Example 5 of the present invention at the highest combustion temperature. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0039] In this application, unless otherwise specified, the numerical range "a-b" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "0-10" means that all real numbers between "0-10" are listed in this document, and "0-10" is just an abbreviation of these numerical combinations.

[0040] In this application, unless otherwise specified, all embodiments and preferred embodiments mentioned herein can be combined with each other to form a new technical solution.

[0041] In this application, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0042] In this application, unless otherwise specified, the term "including" mentioned herein may be open-ended or closed-ended. For example, the term "including" may mean that other components not listed may also be included, or may only include the listed components.

[0043] The metal catalytic combustion catalyst of the present invention comprises a metal carrier and an active component arranged on the surface of the metal carrier.

[0044] According to a specific embodiment, the metal carrier of the present invention is porous iron-chromium-aluminum, and the active components are loaded on the surface and pores of the iron-chromium-aluminum.

[0045] According to a more specific embodiment, the mesh number of the porous iron-chromium-aluminum is 5 to 100 meshes and the thickness is 0.05 to 10 mm.

[0046] According to a specific embodiment, the active component includes metal oxide and noble metal, and the metal oxide is one or more of manganese oxide, titanium oxide, yttrium oxide, cobalt oxide, and tin oxide.

[0047] According to a more specific embodiment, the metal oxide is a mixture of manganese oxide, titanium oxide, yttrium oxide and tin oxide, or a mixture of manganese oxide, titanium oxide and tin oxide, or a mixture of manganese oxide, cobalt oxide, titanium oxide and tin oxide, or a mixture of manganese oxide, cobalt oxide, yttrium oxide, titanium oxide and tin oxide.

[0048] According to a specific embodiment, the noble metal is one or more of platinum, palladium, rhodium, ruthenium or an alloy thereof.

[0049] According to a more specific embodiment, the noble metal is platinum metal.

[0050] According to a specific embodiment, the active component accounts for 0.01% to 0.20% by weight of the total weight of the catalyst.

[0051] According to a specific embodiment, the weight ratio of the noble metal to the metal oxide is 0.3:11 to 1:16.5.

[0052] Based on the above metal catalytic combustion catalyst, its active components have metal oxides and precious metals, which can greatly improve the catalytic activity and low-temperature activity of the catalyst, so that when the catalytic fuel gas is burned, it can produce a high temperature of up to 1100°C, and can re-ignite at a minimum of around 180°C, thereby completely decomposing the fuel gas, so that the only products it generates are carbon dioxide and water.

[0053] The metal catalytic combustion catalyst of the present invention is prepared by the following method, including: step S1: pre-treating a metal carrier to obtain a first intermediate; step S2: treating the first intermediate with a metal salt solution to obtain a second intermediate, wherein the metal element in the metal salt solution is a metal element in a metal oxide; step S3: loading a noble metal on the second intermediate to obtain a catalyst.

[0054] According to a specific embodiment, the method further comprises the following contents: in step S1, the surface of the metal carrier is first cleaned, and then the metal carrier is treated with a weak acid or weak base solution, and then taken out and washed with deionized water and dried.

[0055] According to a more specific embodiment, the weak acid or weak base solution treatment method is: completely immerse the metal carrier in a 5% alkaline or acid solution for treatment, the solution temperature is 40-80° C., and the immersion time is 1 minute.

[0056] According to a more specific embodiment, the alkaline solution is a sodium hydroxide solution, and the acidic solution is one or both of an oxalic acid solution and a nitric acid solution.

[0057] According to a more specific embodiment, a sodium hydroxide solution with a concentration of 5% is selected.

[0058] According to a specific embodiment, the method further comprises the following contents: in step S2, the first intermediate is first placed in a metal salt solution, the metal salt is one or more of cobalt salt, manganese salt, tin salt, titanium salt, and yttrium salt, the total concentration of metal ions in the solution is 0.1 to 10 mol / L, and the solution temperature is 60 to 100°C; then the first intermediate is taken out and blown out; then the first intermediate is roasted, and the second intermediate is obtained after cooling, the roasting temperature is 800 to 1000°C, and the roasting time is 15 to 30 min.

[0059] According to a more specific embodiment, the metal ion solution comprises 1000ml of water, 50g of manganese chloride, 30g of yttrium chloride, 110g of titanium trichloride, and 1g of tin wire; or comprises 1000ml of water, 50g of manganese chloride, 30g of yttrium chloride, 110g of titanium trichloride, and 1g of tin wire; or comprises 1000ml of water, 50g of manganese chloride, 30g of yttrium chloride, 110g of titanium trichloride, and 1g of tin wire; or comprises 1000ml of water, 50g of manganese chloride, 110g of titanium trichloride, and 1g of tin wire; or comprises 1000ml of water, 50g of manganese chloride, 5g of cobalt chloride, 110g of titanium trichloride, and 1g of tin wire; or comprises 1000ml of water, 50g of manganese chloride, 5g of cobalt chloride, 30g of yttrium chloride, 110g of titanium trichloride, and 1g of tin wire.

[0060] According to a more specific embodiment, the solution temperature of the metal ions is selected to be 80°C.

[0061] According to a more specific embodiment, the high temperature roasting time is selected to be 15 minutes.

[0062] According to a specific embodiment, the method further includes the following contents: Step S3 includes: firstly immersing the second intermediate in a precious metal solution, the concentration of the precious metal ions is 0.010-0.100 mol / L, and the immersion time is 5 min; then taking out the second intermediate, and calcining to obtain a catalyst, the calcination temperature is 800-1000°C, and the calcination time is 15-30 min.

[0063] According to a more specific embodiment, the solvent of the noble metal solution is an alcohol solvent, specifically one of methanol, ethanol and isopropanol.

[0064] According to a more specific embodiment, the compound of the precious metal is selected from one or more of chloroplatinic acid, palladium chloride, platinum nitrate, palladium nitrate, rhodium trichloride, and ruthenium trichloride.

[0065] According to a more specific embodiment, the compound of the precious metal is chloroplatinic acid, the content is 0.6% or 0.3%, and the roasting time is 15 minutes.

[0066] The metal catalytic combustion catalyst of the present invention can be used for catalytic combustion of gas, so that the gas is fully burned and carbon dioxide and water are completely produced. The metal catalytic combustion catalyst can be used in the fields of fire supply in catering kitchens, outdoor heating, gas soldering irons, etc.

[0067] Example:

[0068] The metal carrier selected in the embodiment is iron-chromium-aluminum, model is 0Cr21Al6, size is 250ⅹ190ⅹ0.08mm, mesh number is 25 mesh, pore wall thickness is 0.3mm, pores are diamond-shaped, and diagonal distances are 1.6mm and 0.8mm; the reagents used are all analytically pure and used directly, and the water used is pure water.

[0069] Embodiment 1:

[0070] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 80° C. for 1 minute, taken out, washed with pure water, and dried.

[0071] Then prepare a metal salt solution with the following ratio: 1000 ml of water, 50 g of manganese chloride, 30 g of yttrium chloride, 110 g of titanium trichloride, and 1 g of tin wire. Stir well and place on a centrifugal stirrer. Run for 5 minutes. Place the stirred solution in a glass heating vessel and heat to 80°C.

[0072] The alloy carrier is immersed in a metal salt solution for 5 minutes; after being taken out, it is blown out for blocking treatment, placed in a high-temperature furnace body for high-temperature baking for 15 minutes, and air-dried.

[0073] Finally, prepare the noble metal solution, put chloroplatinic acid into ethanol solution, the content is 0.6%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0074] The treated alloy carrier is immersed in the noble metal solution for 5 minutes; the alloy carrier is taken out, placed in a high temperature furnace, and calcined at high temperature for 15 minutes to obtain a metal catalytic combustion catalyst such as Figure 1 shown.

[0075] Embodiment 2:

[0076] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 80° C. for 1 minute, taken out, washed with pure water, and dried.

[0077] Then prepare the metal salt solution with the following ratio: 1000ml water, 50g manganese chloride, 30g yttrium chloride, 110g titanium trichloride, 1g tin wire. Stir well, place on a centrifugal stirrer, and run for 5 minutes; place the stirred solution in a glass heating vessel and heat to 80°C;

[0078] The alloy carrier is immersed in a metal salt solution for 5 minutes; taken out and blown out for blocking treatment; put into a high-temperature furnace, high-temperature roasted for 15 minutes, and dried.

[0079] Finally, prepare the precious metal solution, add chloroplatinic acid into the ethanol solution, the content is 0.3%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0080] The treated alloy carrier is immersed in the noble metal solution for 5 minutes, and then the alloy carrier is taken out and placed in a high temperature furnace for high temperature roasting for 15 minutes to obtain a metal catalytic combustion catalyst.

[0081] Embodiment 3:

[0082] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 80° C. for 1 minute, taken out, washed with pure water, and dried.

[0083] Then prepare a metal salt solution with the following ratio: 1000ml water, 50g manganese chloride, 30g yttrium chloride, 110g titanium trichloride, 1g tin wire; stir thoroughly, place on a centrifugal stirrer, and run for 5 minutes; place the stirred solution in a glass heating vessel and heat to 80°C;

[0084] The alloy carrier is immersed in a metal salt solution for 5 minutes; taken out and blown out for blocking treatment; put into a high-temperature furnace, high-temperature roasted for 15 minutes, and dried.

[0085] Finally, prepare the precious metal solution, add chloroplatinic acid into the ethanol solution, the content is 0.6%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0086] The treated alloy carrier is immersed in the noble metal solution for 5 minutes, and then the alloy carrier is taken out and placed in a high temperature furnace for high temperature roasting for 15 minutes to obtain a metal catalytic combustion catalyst.

[0087] Embodiment 4:

[0088] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 80° C. for 1 minute, taken out, washed with pure water, and dried.

[0089] Then prepare a metal salt solution with the following ratio: 1000ml water, 50g manganese chloride, 110g titanium trichloride, 1g tin wire; stir thoroughly, place on a centrifugal stirrer, and run for 5 minutes; place the stirred solution in a glass heating container and heat to 80°C;

[0090] The alloy carrier is immersed in the metal salt solution for 5 minutes, taken out and blown out, placed in a high temperature furnace, calcined at high temperature for 15 minutes, and dried.

[0091] Finally, prepare the precious metal solution, add chloroplatinic acid into the ethanol solution, the content is 0.3%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0092] The treated alloy carrier is immersed in a noble metal solution for 5 minutes; the alloy carrier is taken out, placed in a high-temperature furnace, and calcined at high temperature for 15 minutes to obtain a metal catalytic combustion catalyst.

[0093] Embodiment 5:

[0094] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 80° C. for 1 minute, taken out, washed with pure water, and dried.

[0095] Then prepare a metal salt solution with the following ratio: 1000ml water, 50g manganese chloride, 5g cobalt chloride, 110g titanium trichloride, 1g tin wire; stir thoroughly, place on a centrifugal stirrer, and run for 5 minutes; place the stirred solution in a glass heating container and heat to 80°C;

[0096] The alloy carrier is immersed in a metal salt solution for 5 minutes; taken out and blown out for blocking treatment; put into a high-temperature furnace, high-temperature roasted for 15 minutes, and dried.

[0097] Finally, prepare the precious metal solution, add chloroplatinic acid into the ethanol solution, the content is 0.6%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0098] The treated alloy carrier is immersed in a noble metal solution for 5 minutes; the alloy carrier is taken out, placed in a high-temperature furnace, and calcined at high temperature for 15 minutes to obtain a metal catalytic combustion catalyst.

[0099] Embodiment 6:

[0100] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 40° C. for 1 minute, taken out, washed with pure water, and dried.

[0101] Then prepare the metal salt solution: 1000ml water, 50g manganese chloride, 5g cobalt chloride, 30g yttrium chloride, 110g titanium trichloride, 1g tin wire; stir well, place on a centrifugal stirrer, run for 5 minutes; place the stirred solution in a glass heating container, and heat to 80°C;

[0102] The alloy carrier is immersed in a metal salt solution for 5 minutes; taken out and blown out for blocking treatment; put into a high-temperature furnace, high-temperature roasted for 15 minutes, and dried.

[0103] Finally, prepare the precious metal solution, put palladium chloride into the ethanol solution, the content is 0.6%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0104] The treated alloy carrier is immersed in a noble metal solution for 5 minutes; the alloy carrier is taken out, placed in a high-temperature furnace, and calcined at high temperature for 15 minutes to obtain a metal catalytic combustion catalyst.

[0105] Comparative Example:

[0106] First, the alloy carrier was immersed in a 5% sodium hydroxide aqueous solution, heated to 80° C. for 1 minute, taken out, washed with pure water, and dried.

[0107] Then prepare the noble metal solution, add chloroplatinic acid into the ethanol solution, the content is 0.6%, place it on a centrifugal stirrer, and stir for 5 minutes until it is uniform;

[0108] The treated alloy carrier is immersed in a noble metal solution for 5 minutes, and then the alloy carrier is taken out and placed in a high-temperature furnace for high-temperature roasting for 15 minutes to obtain a catalyst.

[0109] The catalysts obtained in Examples 1 to 6 were roasted with an open flame using a cartridge spray gun, and the highest temperature of the catalysts was measured using an infrared high-temperature thermometer; the cartridge valve was closed, the open flame was extinguished, and then the cartridge valve was opened again to observe whether the catalysts could reignite and their lowest reignition temperatures, and the results are shown in Table 1:

[0110] Table 1

[0111]

[0112]

[0113] Through the above data and experiments, we can draw the following conclusions: The infrared catalysts prepared in Examples 1 to 6 of the present invention can generate infrared temperatures above 1000 degrees (the highest combustion temperature of Example 5 is shown in the attached photo). Figure 2 As shown in the figure, the catalyst exhibits a catalytic effect at low temperature re-ignition. However, in the comparative example, due to the absence of metal oxide, the reaction temperature only reaches 800 degrees, and low temperature re-ignition cannot be achieved.

Claims

1. A metal catalytic combustion catalyst, characterized in that: It includes a metal carrier and an active component arranged on the surface of the metal carrier, the active component includes a metal oxide and a noble metal, the metal oxide is one or more of manganese oxide, titanium oxide, yttrium oxide, cobalt oxide, and tin oxide, the noble metal is one or more of platinum, palladium, rhodium, and ruthenium or an alloy, and the weight ratio of the noble metal to the metal oxide is 0.3:11 to 1:16.

5.

2. The metal catalytic combustion catalyst according to claim 1, characterized in that: The metal carrier is porous iron-chromium-aluminum.

3. The metal catalytic combustion catalyst according to claim 1 or 2, characterized in that: By weight, the active component accounts for 0.01% to 0.20% of the total weight of the catalyst.

4. A method for preparing a metal catalytic combustion catalyst, the method being used to prepare the metal catalytic combustion catalyst according to any one of claims 1 to 3, characterized in that: include: Step S1: pre-treating the metal support to obtain a first intermediate; Step S2: treating the first intermediate with a metal salt solution to obtain a second intermediate, wherein the metal element in the metal salt solution is the metal element in the metal oxide; Step S3: loading a noble metal on the second intermediate to obtain a catalyst.

5. The method for preparing the metal catalytic combustion catalyst according to claim 4, characterized in that: The step S2 comprises: First, the first intermediate is placed in the metal salt solution, wherein the metal salt is one or more of cobalt salt, manganese salt, tin salt, titanium salt, and yttrium salt, the total concentration of metal ions in the solution is 0.1 to 10 mol / L, and the solution temperature is 60 to 100° C.; Then, the first intermediate is taken out and blown out; Then, the first intermediate is calcined, and after cooling, the second intermediate is obtained. The calcination temperature is 800-1000° C., and the calcination time is 15-30 minutes.

6. The method for preparing the metal catalytic combustion catalyst according to claim 4 or 5, characterized in that: The step S3 comprises: First, the second intermediate is immersed in a noble metal solution, the concentration of the noble metal ion is 0.010-0.100 mol / L, and the immersion time is 5 min; Then, the second intermediate is taken out and calcined to obtain a catalyst. The calcination temperature is 800-1000° C. and the calcination time is 15-30 minutes.

7. The method for preparing a metal catalytic combustion catalyst according to claim 6, characterized in that: In step S3, the solvent of the noble metal solution is an alcohol solvent, and the noble metal compound is selected from one or more of chloroplatinic acid, palladium chloride, platinum nitrate, palladium nitrate, rhodium trichloride, and ruthenium trichloride.

8. The method for preparing the metal catalytic combustion catalyst according to claim 4 or 5, characterized in that: The step S1 comprises: first cleaning the surface of the metal carrier, completely immersing the metal carrier in an alkaline or acidic solution with a concentration of 5% for treatment, taking it out and washing it with deionized water and drying it, wherein the solution temperature is 40-80°C, the immersion time is 1 min, the alkaline solution is a sodium hydroxide solution, and the acidic solution is one or both of an oxalic acid solution and a nitric acid solution.

9. A method for catalytic combustion of fuel gas, characterized in that: The method comprises causing the fuel gas to undergo a catalytic combustion reaction under the action of a supported catalyst, wherein the supported catalyst: The metal catalytic combustion catalyst according to any one of claims 1 to 3; Or it is prepared by the method for preparing the metal catalytic combustion catalyst according to any one of claims 4 to 8.

10. The method for catalytic combustion of fuel gas according to claim 9, characterized in that: The metal carrier of the supported catalyst is porous iron-chromium-aluminum with a mesh number of 5 to 100 meshes and a thickness of 0.05 to 10 mm.

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