Target plating deoxidation catalyst as well as preparation method and application thereof

Abstract

The invention discloses a target plating deoxidation catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst comprises a matrix carrier and a target layer plated on the surface of the matrix carrier, the matrix carrier is made of a titanium-based material or a carbon-based material, the content of the target layer is 0.05%-10% of the total mass of the catalyst, and the thickness of the target layer is 0.5-5 microns. The preparation method comprises the steps of matrix carrier pretreatment, target plating treatment and post-treatment. According to the method, efficient dispersion of a target is achieved through a plating process, the use amount of precious metal is reduced while high deoxidation activity is guaranteed, the catalyst has excellent water vapor resistance and acid and alkali corrosion resistance, trace oxygen in hydrogen can be efficiently removed to 0.1 ppm or below in a wet environment of hydrogen production through water electrolysis, and the system safety and the hydrogen purity are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of catalyst technology, specifically relating to a target-coated deoxygenation catalyst, its preparation method, and its application. Background Technology

[0002] Water electrolysis for hydrogen production is a clean and efficient technology that converts electrical energy into hydrogen energy through the electrolysis of water. The resulting hydrogen has high purity, and if combined with renewable energy power generation to drive the electrolysis process, "green hydrogen" production can be achieved. However, in actual hydrogen production, due to factors such as gas permeability of the electrolyzer membrane, electrode side reactions, and system leaks, trace amounts of oxygen (typically 0.1%-1%) are often mixed into the hydrogen produced at the cathode. This hydrogen-oxygen mixture poses an explosion risk within a specific concentration range (hydrogen fraction 4%-75%), seriously threatening system safety. Furthermore, residual oxygen can cause oxidation and corrosion to downstream devices such as hydrogen storage equipment and fuel cells, shortening their lifespan. Therefore, deep deoxygenation treatment of the hydrogen produced by water electrolysis is crucial.

[0003] Currently, commonly used deoxygenation methods in water electrolysis for hydrogen production include catalytic deoxygenation and adsorption. Among these, catalytic deoxygenation is widely used due to its high efficiency and ease of operation. The core of catalytic deoxygenation is to use a catalyst to promote the reaction of hydrogen and oxygen to produce water, thereby removing oxygen.

[0004] Currently, the deoxygenation catalysts widely used in industry are mainly supported noble metal catalysts. These are prepared by loading noble metal active components such as targets and platinum onto the surface of conventional support materials such as alumina and silica. These catalysts achieve their deoxygenation function by catalyzing the oxidation reaction of hydrogen and oxygen to produce water molecules. However, in the unique humid operating environment of water electrolysis hydrogen production systems, these catalysts suffer from the following technical drawbacks: First, the support materials generally have insufficient resistance to water vapor, and are prone to structural collapse and failure during long-term operation, leading to the migration and loss of the noble metal active components. Second, the noble metal active components are mostly loaded on the support surface in a low-dispersion particulate form. To ensure sufficient deoxygenation catalytic activity, a high content of noble metal must be used, which significantly increases the catalyst preparation cost. Furthermore, in acidic or alkaline electrolyte environments, the support material and the noble metal active components are easily corroded and deactivated, severely affecting the overall service life of the catalyst.

[0005] Therefore, developing a deoxygenation catalyst with high water vapor resistance, high noble metal dispersion, low cost, and suitability for water electrolysis hydrogen production environment is of great practical significance. Summary of the Invention

[0006] To overcome the problems of poor water vapor resistance, low noble metal dispersion, high cost, and insufficient acid and alkali corrosion resistance of existing supported noble metal catalysts during long-term use, a target-coated deoxygenation catalyst, its preparation method, and its application are provided, thereby safely and efficiently removing trace amounts of oxygen from hydrogen and avoiding the risk of explosion.

[0007] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a target-coated deoxygenation catalyst, comprising a substrate support and a target layer coated on the surface of the substrate support; The substrate carrier is a titanium-based material or a carbon-based material; The target layer accounts for 0.05%-10% of the total mass of the target-coated deoxygenation catalyst by mass percentage; The thickness of the target layer is 0.5-5 μm.

[0008] A further improvement of the present invention is that the surface of the substrate carrier is roughened, and its surface roughness Ra is 0.5-2μm; The roughening treatment is performed by sandblasting or acid etching.

[0009] A further improvement of the present invention is that the titanium-based material is a titanium mesh or titanium sheet; and the carbon-based material is a carbon nanotube array or graphite felt.

[0010] Secondly, the present invention also provides a method for preparing a target-coated deoxidation catalyst, comprising the following steps: Step 1, matrix carrier pretreatment: The matrix carrier is subjected to degreasing, acidification and activation treatment in sequence, and then rinsed with deionized water until neutral to obtain the pretreated matrix carrier; Step 2, target plating treatment: depositing a target layer on the surface of the pretreated substrate to obtain the target-plated substrate; Step 3, post-treatment: The substrate after target plating is rinsed with deionized water, dried, and then reduced in a hydrogen atmosphere to obtain the target-plated deoxygenation catalyst.

[0011] A further improvement of the present invention is that, in step 1, the degreasing treatment uses a sodium hydroxide solution with a mass fraction of 5%-10% and soaks it at 50-70°C for 10-30 minutes. The acidification treatment uses a hydrochloric acid solution with a volume fraction of 10%-20%, and soaks the sample at room temperature for 5-15 minutes. The activation treatment uses a 1%-3% (w / w) hydrochloric acid solution containing chlorinated target, and is immersed at 30-50℃ for 5-10 minutes.

[0012] A further improvement of the present invention is that, in step 2, the target plating treatment is carried out by chemical plating or electroplating; When using chemical plating, the plating solution includes target salt, reducing agent, complexing agent and pH adjuster; wherein, the target salt concentration is 5-20 g / L, the reducing agent is sodium hypophosphite or hydrazine with a concentration of 10-30 g / L, the complexing agent is ethylenediamine or citric acid, the pH value is adjusted to 8-10, and the reaction is carried out at 50-80℃ for 10-60 min. When electroplating is used, the target salt concentration in the plating solution is 10-30 g / L, and the current density is 1-5 A / dm³. 2 The temperature is 20-40℃ and the electroplating time is 5-30 minutes.

[0013] A further improvement of the present invention is that, in step 2, the target salt is at least one of a chloride target and a nitrate target.

[0014] A further improvement of the present invention is that, in step 3, the carrier after target plating is rinsed with deionized water, vacuum dried at 60-80°C for 2-4 hours, and then reduced at 200-300°C for 1-3 hours in a hydrogen atmosphere.

[0015] Thirdly, the present invention also provides an application of a target-plated deoxygenation catalyst in a water electrolysis hydrogen production system, wherein the target-plated deoxygenation catalyst is loaded into the hydrogen purification unit.

[0016] A further improvement of the present invention is that the oxygen-containing hydrogen gas produced by the water electrolysis hydrogen production system is subjected to a pressure of 0.1-1 MPa, a temperature of 20-80°C, and a space velocity of 5000-20000 h⁻¹. -1 Under these conditions, the oxygen concentration in hydrogen is reduced to ≤0.1ppm by passing through a bed packed with the catalyst.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a target-coated deoxygenation catalyst. Firstly, it employs either titanium-based or carbon-based materials as the substrate support. Titanium-based materials provide the catalyst with excellent mechanical strength and corrosion resistance, ensuring long-term stability in acidic or alkaline reaction environments. Carbon-based materials offer a large specific surface area and good electrical conductivity, significantly increasing the exposure of active sites and improving catalytic efficiency. Secondly, the target layer is designed with a mass ratio of 0.05%-10% and a thickness of 0.5-5 μm to precisely control the active material. This avoids cost waste due to excessive target layering while ensuring the continuous catalytic reaction through sufficient thickness, achieving a balance between activity and economy. Furthermore, the coexistence of the corrosion resistance of titanium-based supports and the lightweight advantages of carbon-based supports allows the catalyst to adapt to complex reaction environments such as acidic / alkaline conditions. It exhibits high activity and long lifespan in deoxygenation scenarios such as hydrogen purification and fuel cell oxygen reduction, demonstrating both industrial application potential and environmental benefits.

[0018] This invention also provides a method for preparing a target-coated deoxygenation catalyst. First, the substrate is degreased, acidified, and activated to effectively remove organic matter and oxide layers from the support surface, while simultaneously activating active sites on the support surface. This significantly improves the bonding force and interfacial compatibility between the target layer and the substrate, preventing target layer detachment or aggregation. Second, precise control of deposition parameters during the target coating process allows for accurate regulation of the target layer thickness and mass ratio, ensuring the target amount required for catalytic activity while avoiding excessive use of precious metals, thus reducing preparation costs. Finally, any oxidized targets that may exist in the coating are reduced to highly active metal targets, while internal stress is eliminated, and the target grain structure is optimized, further enhancing the catalyst's activity and stability. This method, through the synergistic process of pretreatment-coating-reduction, enables the catalyst to possess the advantages of high catalytic efficiency, long service life, and low preparation cost, significantly improving system safety and hydrogen purity. Detailed Implementation

[0019] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0020] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0021] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0022] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0023] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0024] The present invention provides a target-coated deoxygenation catalyst, comprising a substrate support and a target layer coated on the surface of the substrate support, wherein the target layer accounts for 0.05%-10% of the total mass of the target-coated deoxygenation catalyst by mass percentage.

[0025] As a preferred option, the substrate is either titanium-based or carbon-based, specifically selected from titanium mesh, titanium sheets, carbon nanotube arrays, or graphite felt. Titanium-based or carbon-based materials are chosen as the substrate because titanium-based materials possess excellent resistance to acid and alkali corrosion and superior mechanical properties, enabling them to withstand the alkaline or acidic environments of water electrolysis for hydrogen production. Carbon-based materials, such as carbon nanotube arrays and graphite felt, have a large specific surface area and good electrical conductivity, as well as strong resistance to water vapor, which is beneficial for the diffusion and reaction of hydrogen and oxygen on the catalyst surface. Controlling the target layer thickness to 0.5-5 μm ensures sufficient active sites while avoiding the waste of precious metals and reducing costs.

[0026] Furthermore, the surface of the substrate support is roughened to a surface roughness Ra of 0.5-2 μm, wherein the roughening treatment is sandblasting or acid etching. This roughening treatment increases the specific surface area of ​​the substrate support, enhances the bonding force between the target layer and the support, prevents the target layer from detaching during use, and improves the stability of the catalyst.

[0027] This invention also provides a method for preparing a target-coated deoxidation catalyst, comprising the following steps: Step 1: Pretreatment of the substrate carrier. The substrate carrier is subjected to degreasing, acidification, and activation treatments in sequence. The degreasing treatment uses a 5%-10% sodium hydroxide solution and is immersed at 50-70℃ for 10-30 min. The acidification treatment uses a 10%-20% hydrochloric acid solution and is immersed at room temperature for 5-15 min. The activation treatment uses a 1%-3% target chloride hydrochloric acid solution and is immersed at 30-50℃ for 5-10 min. This process forms a target seed crystal layer on the carrier surface, providing active sites for subsequent target plating. The carrier is then rinsed with deionized water until neutral to obtain the pretreated substrate carrier.

[0028] Step 2, target plating treatment: a target layer is deposited on the surface of the pretreated substrate using chemical plating or electroplating to obtain the target-plated substrate. When using chemical plating, the plating solution includes a target salt, a reducing agent, a complexing agent, and a pH adjuster. The target salt concentration is 5-20 g / L, the reducing agent is sodium hypophosphite or hydrazine at a concentration of 10-30 g / L, the complexing agent is ethylenediamine or citric acid, and the pH is adjusted to 8-10. The reaction is carried out at 50-80℃ for 10-60 min. When using electroplating, the target salt concentration in the plating solution is 10-30 g / L, and the current density is 1-5 A / dm³. 2 The temperature is 20-40℃, and the electroplating time is 5-30 minutes; Furthermore, the target salt is at least one of chloride target and nitrate target. These target salts have good solubility in the plating solution, which can ensure the stability of the plating solution and the uniformity of the target layer. Chemical plating requires no external power source and can form a uniform target layer on the surface of a carrier with complex shapes; electroplating, on the other hand, can precisely control the target layer thickness by controlling the current density and time. The two methods can be selected according to actual needs.

[0029] Step 3, post-treatment: The support after target plating is rinsed with deionized water and vacuum dried at 60-80℃ for 2-4 hours to remove residual plating solution on the surface; then it is reduced in a hydrogen atmosphere at 200-300℃ for 1-3 hours to reduce any possible target oxides to metal targets, thereby improving the activity of the catalyst and obtaining the target-plated deoxygenation catalyst.

[0030] This invention also provides an application of the above-mentioned target-coated deoxygenation catalyst in a water electrolysis hydrogen production system. The target-coated deoxygenation catalyst is loaded into the hydrogen purification unit, and the oxygen-containing hydrogen produced by the water electrolysis hydrogen production system is purified under conditions of 0.1-1 MPa pressure, 20-80°C temperature, and 5000-20000 h⁻¹. -1 Under these conditions, by passing through a bed packed with the catalyst, the oxygen concentration in hydrogen is reduced to ≤0.1ppm. These application conditions are compatible with the operating conditions of a water electrolysis hydrogen production system, efficiently removing trace amounts of oxygen from hydrogen and ensuring system safety and hydrogen purity.

[0031] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0032] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0033] Example 1 This embodiment provides a target-coated deoxygenation catalyst for hydrogen production by water electrolysis, using a titanium mesh as the substrate support (sandblasted to a surface roughness Ra=0.5μm), a target layer thickness of 0.5μm, and a target content of 1% of the total catalyst mass.

[0034] Its preparation method includes the following steps: Step 1: Place the titanium mesh in a 5% sodium hydroxide solution and soak it at 50°C for 30 minutes to degrease it; then soak it in a 10% hydrochloric acid solution at room temperature for 15 minutes to pickle it; then place it in a 1% hydrochloric acid solution and soak it at 30°C for 10 minutes to activate it; finally, rinse it with deionized water until neutral to obtain the pretreated titanium mesh. Step 2: A target layer is deposited on the surface of the pretreated titanium mesh using chemical plating. The concentration of target chloride in the plating solution is 5 g / L, the concentration of sodium hypophosphite is 10 g / L, the complexing agent is ethylenediamine, the pH value is adjusted to 8 using sodium hydroxide, and the reaction is carried out at 50℃ for 60 min to obtain the target-plated titanium mesh. Step 3: Rinse the titanium mesh after target plating with deionized water, vacuum dry it at 60°C for 4 hours, and then reduce it at 200°C for 3 hours in a hydrogen atmosphere to obtain the target plating deoxygenation catalyst.

[0035] The catalyst was applied to hydrogen purification in a water electrolysis hydrogen production system, with hydrogen produced at a pressure of 0.1 MPa, a temperature of 20 °C, and a space velocity of 5000 h⁻¹. -1 Under certain conditions, the oxygen content in hydrogen decreased from 0.5% to 0.08 ppm through the catalyst bed.

[0036] Example 2 This embodiment provides a target-coated deoxygenation catalyst for hydrogen production by water electrolysis, using a titanium mesh as the substrate support (acid-etched, with a surface roughness Ra=1.2μm), a target layer thickness of 2μm, and a target content of 5% of the total catalyst mass.

[0037] Its preparation method includes the following steps: Step 1: The carbon nanotube array is placed in a 7% sodium hydroxide solution and soaked at 60°C for 20 min to degrease; then it is soaked in a 15% hydrochloric acid solution at room temperature for 10 min to acid wash; then it is placed in a 2% target chloride hydrochloric acid solution and soaked at 40°C for 7 min to activate; then it is rinsed with deionized water until neutral to obtain the pretreated carbon nanotube array. Step 2: A target layer is deposited on the surface of the pretreated carbon nanotube array using electroplating. The target concentration of nitric acid in the plating bath is 20 g / L, and the current density is 3 A / dm³. 2 The temperature was 30℃ and the electroplating time was 15 min to obtain a carbon nanotube array after target plating. Step 3: Rinse the carbon nanotube array after target coating with deionized water, vacuum dry at 70°C for 3 hours, and then reduce it at 250°C for 2 hours in a hydrogen atmosphere to obtain the target-coated deoxygenation catalyst.

[0038] The catalyst was applied to hydrogen purification in a water electrolysis hydrogen production system, where hydrogen was produced at a pressure of 0.5 MPa, a temperature of 50 °C, and a space velocity of 12000 h⁻¹. -1 Under certain conditions, the oxygen content in hydrogen decreased from 0.8% to 0.05 ppm through the catalyst bed.

[0039] Example 3 This embodiment provides a target-coated deoxygenation catalyst for hydrogen production by water electrolysis, using a titanium mesh as the substrate support (sandblasted to a surface roughness Ra=2μm), a target layer thickness of 5μm, and a target content of 10% of the total catalyst mass.

[0040] Its preparation method includes the following steps: Step 1: Place the graphite felt in a 10% sodium hydroxide solution and soak it at 70°C for 10 minutes to degrease it; then soak it in a 20% hydrochloric acid solution at room temperature for 5 minutes to acid wash it; then place it in a 3% sodium chloride hydrochloric acid solution and soak it at 50°C for 5 minutes to activate it; then rinse it with deionized water until neutral to obtain the pretreated graphite felt. Step 2: A target layer is deposited on the surface of the pretreated graphite felt using chemical plating. The target concentration of nitric acid in the plating solution is 20 g / L, the concentration of hydrazine is 30 g / L, the complexing agent is citric acid, the pH value is adjusted to 10 using sodium hydroxide, and the reaction is carried out at 80℃ for 10 min to obtain the target-plated graphite felt. Step 3: Rinse the graphite felt after target plating with deionized water, vacuum dry it at 80°C for 2 hours, and then reduce it at 300°C for 1 hour in a hydrogen atmosphere to obtain the target plating deoxygenation catalyst.

[0041] The catalyst was applied to hydrogen purification in a water electrolysis hydrogen production system, where hydrogen was produced at a pressure of 1 MPa, a temperature of 80 °C, and a space velocity of 20,000 h⁻¹. -1 Under certain conditions, the oxygen content in hydrogen was reduced from 1% to 0.03 ppm through the catalyst bed.

[0042] Comparative Example 1 This comparative example provides a commercially available supported target deoxygenation catalyst, which is prepared by an equal-volume impregnation method using γ-Al2O3 as the support: the γ-Al2O3 support is impregnated into a chlorinated target solution (the target loading is 5%, which is consistent with the target content in Example 2), dried, calcined in air at 400°C for 3 hours, and then reduced with hydrogen at 250°C for 2 hours.

[0043] The catalyst was used in the same water electrolysis hydrogen production and deoxygenation scenario as in Example 2: hydrogen was produced at a pressure of 0.5 MPa, a temperature of 50°C, and a space velocity of 12000 h⁻¹. -1 Under certain conditions, it passes through the catalyst bed.

[0044] Test results showed that the initial oxygen content decreased from 0.8% to 0.15 ppm; after 500 hours of continuous operation, the oxygen removal efficiency decreased to 0.5 ppm, and the loss rate of the target active component reached 15%.

[0045] Comparative Example 2 This comparative example provides a target-coated deoxidation catalyst, using an unroughened carbon nanotube array as the substrate support (surface roughness Ra = 0.1 μm), a target layer thickness of 2 μm, and a target content of 5% of the total catalyst mass. Its preparation method includes the following steps: Step 1: The carbon nanotube array is placed in a 7% sodium hydroxide solution and soaked at 60°C for 20 min to degrease; then it is soaked in a 15% hydrochloric acid solution at room temperature for 10 min to acid wash; then it is placed in a 2% target chloride hydrochloric acid solution and soaked at 40°C for 7 min to activate; then it is rinsed with deionized water until neutral to obtain the pretreated carbon nanotube array. Step 2: A target layer is deposited on the surface of the pretreated carbon nanotube array using electroplating. The target concentration of nitric acid in the plating bath is 20 g / L, and the current density is 3 A / dm³. 2 The temperature was 30℃ and the electroplating time was 15 min to obtain a carbon nanotube array after target plating. Step 3: Rinse the carbon nanotube array after target coating with deionized water, vacuum dry at 70°C for 3 hours, and then reduce it at 250°C for 2 hours in a hydrogen atmosphere to obtain the target-coated deoxygenation catalyst.

[0046] The catalyst was subjected to deoxygenation tests under the same conditions as in Example 2: the initial oxygen content decreased from 0.8% to 0.06 ppm (similar to Example 2); however, after 500 hours of continuous operation, due to the weak bonding between the target layer and the support, local detachment occurred, and the oxygen removal effect decreased to 0.3 ppm, with a target layer detachment rate of 8%.

[0047] In summary, this invention forms a highly dispersed target layer on the surface of a substrate support through a plating process, achieving highly efficient deoxidation activity with a smaller amount of precious metals and significantly reducing catalyst costs. Using titanium-based or carbon-based materials as the support, combined with surface roughening treatment, endows the catalyst with excellent resistance to water vapor and acid / alkali corrosion, enabling it to stably adapt to the humid and complex acid / alkali environments of water electrolysis for hydrogen production, effectively extending its service life. Furthermore, the preparation method offers both chemical plating and electroplating options, is simple and controllable, and allows for adjustments to the production plan according to actual needs, providing technical feasibility for large-scale industrial application.

[0048] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A target-coated deoxidation catalyst, characterized in that, It includes a substrate carrier and a target layer coated on the surface of the substrate carrier; The substrate carrier is a titanium-based material or a carbon-based material; The target layer accounts for 0.05%-10% of the total mass of the target-coated deoxygenation catalyst by mass percentage; The thickness of the target layer is 0.5-5 μm.

2. The target-coated deoxidation catalyst according to claim 1, characterized in that, The surface of the substrate carrier is roughened, and its surface roughness Ra is 0.5-2 μm; The roughening treatment is performed by sandblasting or acid etching.

3. The target-coated deoxidation catalyst according to claim 1, characterized in that, The titanium-based material is a titanium mesh or titanium sheet; the carbon-based material is a carbon nanotube array or graphite felt.

4. A method for preparing the target-coated deoxidation catalyst according to claim 1, characterized in that, Includes the following steps: Step 1, matrix carrier pretreatment: The matrix carrier is subjected to degreasing, acidification and activation treatment in sequence, and then rinsed with deionized water until neutral to obtain the pretreated matrix carrier; Step 2, target plating treatment: depositing a target layer on the surface of the pretreated substrate to obtain the target-plated substrate; Step 3, post-treatment: The substrate after target plating is rinsed with deionized water, dried, and then reduced in a hydrogen atmosphere to obtain the target-plated deoxygenation catalyst.

5. The method for preparing a target-coated deoxidation catalyst according to claim 4, characterized in that, In step 1, the degreasing treatment uses a sodium hydroxide solution with a mass fraction of 5%-10% and is soaked at 50-70℃ for 10-30 minutes. The acidification treatment uses a hydrochloric acid solution with a volume fraction of 10%-20%, and soaks the sample at room temperature for 5-15 minutes. The activation treatment uses a 1%-3% (w / w) hydrochloric acid solution containing chlorinated target, and is immersed at 30-50℃ for 5-10 minutes.

6. The method for preparing a target-coated deoxidation catalyst according to claim 4, characterized in that, In step 2, the target plating treatment is performed using chemical plating or electroplating; When using chemical plating, the plating solution includes target salt, reducing agent, complexing agent and pH adjuster; wherein, the target salt concentration is 5-20 g / L, the reducing agent is sodium hypophosphite or hydrazine with a concentration of 10-30 g / L, the complexing agent is ethylenediamine or citric acid, the pH value is adjusted to 8-10, and the reaction is carried out at 50-80℃ for 10-60 min. When electroplating is used, the target salt concentration in the plating bath is 10-30 g / L, and the current density is 1-5 A / dm³. 2 The temperature is 20-40℃ and the electroplating time is 5-30 minutes.

7. The method for preparing a target-coated deoxidation catalyst according to claim 5, characterized in that, In step 2, the target salt is at least one of a chloride target and a nitrate target.

8. The method for preparing a target-coated deoxidation catalyst according to claim 4, characterized in that, In step 3, the substrate after target plating is rinsed with deionized water, vacuum dried at 60-80℃ for 2-4 hours, and then reduced at 200-300℃ in a hydrogen atmosphere for 1-3 hours.

9. The application of the target-coated deoxygenation catalyst according to claim 1 in a water electrolysis hydrogen production system, characterized in that, The target-coated deoxygenation catalyst is loaded into the hydrogen purification unit.

10. The application of the target-coated deoxygenation catalyst according to claim 9 in a water electrolysis hydrogen production system, characterized in that, The oxygen-containing hydrogen produced by the water electrolysis hydrogen production system is subjected to a pressure of 0.1-1 MPa, a temperature of 20-80℃, and a space velocity of 5000-20000 h⁻¹. -1 Under these conditions, the oxygen concentration in hydrogen is reduced to ≤0.1ppm by passing through a bed packed with the catalyst.