40results about How to "Prevent sintering" patented technology

The application belongs to the technical field of carbonyl sulfur hydrolysis catalysts, and discloses a high-efficiency sulfur-resistant catalyst for carbonyl sulfur hydrolysis, a preparation method and application thereof.The preparation method comprises the following steps: (1) preparing a porous ceramic carrier containing alumina, titanium dioxide and zirconium dioxide; (2) in-situ growing a metal organic framework material containing lanthanum, bismuth and cerium on the surface of the porous ceramic carrier by using a solvothermal method; (3) performing a calcination treatment on the porous ceramic carrier loaded with the metal organic framework material in an oxygen-containing atmosphere to obtain a catalyst precursor; and (4) performing a reducing gas plasma bombardment treatment on the catalyst precursor to obtain the high-efficiency sulfur-resistant catalyst.The high-efficiency sulfur-resistant catalyst has high-efficiency low-temperature activity, excellent sulfur resistance and long service life.

This invention relates to the field of marine propulsion technology, specifically to an auxiliary propulsion structure for electric ships. The structure includes a ship hull, a propeller mounted on the bottom of the hull, and rotating rods fixedly connected to both sides of the hull. An auxiliary propeller is mounted on each rotating rod. Through an idling cooling mechanism, when the water inlet is above the water surface, causing the drive rod to drive the auxiliary propeller to idle, the idling cooling mechanism opens an emergency water path. This allows pre-stored cooling water from the tank to be precisely delivered via drip pipes to the junction of the drive rod and the bearing. This directional dripping forms a water film at the friction interface, providing immediate lubrication and drag reduction, as well as rapid heat absorption and cooling, preventing high-temperature wear, deformation, or sintering of components. Compared to traditional unprotected designs, this mechanism is fast-responding and highly targeted, minimizing damage to core components during idling and ensuring reliable operation of the auxiliary propeller in complex waters.

A catalyst for coupling pyridine to prepare 2,2-bipyridine and a preparation method thereof, relates to the technical field of catalyst preparation. The catalyst takes nickel oxide as an active component, enhances the basicity of the catalyst surface by introducing an auxiliary element, loads the active component on alumina by a deposition precipitation method, and is prepared by kneading and extruding into a strip. The method is simple in preparation and low in cost. The obtained catalyst can make the conversion rate of pyridine reach 14.98% and above under low temperature reaction conditions of 110 DEG C, the selectivity of 2,2-bipyridine is as high as 80% and above, and the catalyst has good catalytic activity and application prospect.

The invention discloses a methane reforming catalyst capable of improving hydrothermal resistance as well as a preparation method and application of the methane reforming catalyst, and belongs to the technical field of catalyst preparation. According to the catalyst, a modified HAP-Ce composite carrier is prepared through coprecipitation, hydrothermal treatment and calcination, metal precursor salt serves as a modification component, Ni is impregnated and loaded, calcination is conducted, and then water vapor / nitrogen high-temperature hydrothermal treatment and hydrogen reduction are conducted to obtain the target catalyst. According to the catalyst, a heterogeneous metal oxide composite interface is constructed in situ, stable pinning of Ce species is achieved, and the Ni anchoring effect is enhanced, so that Ce migration and Ni sintering under the hydrothermal condition are inhibited, and high reaction activity, excellent carbon deposition resistance and good hydrothermal stability are shown; the preparation method has the advantages of controllable conditions and simple steps, and is easy for large-scale production and application.

This invention discloses a two-step hydrothermal method for preparing nickel-iron bimetallic MOF derivatives and its application. By controlling the precursor structure through a two-step hydrothermal strategy, the nickel-iron bimetallic MOF derivative catalyst forms a foam-like hierarchical porous carbon framework. The metal nanoparticles are uniformly dispersed, small in size, and encapsulated by carbon layers, significantly improving the specific surface area and accessibility of active sites. It exhibits excellent hydrogen yield and anti-carbon deposition performance in plastic pyrolysis tar reforming. The synergistic effect of nickel and iron electrons effectively inhibits metal sintering and carbon deposition, and has good catalytic stability. This invention solves the problem in existing nickel-iron bimetallic MOF derivatives where phase separation easily occurs in one-step synthesis due to the difference in nucleation and growth rates between nickel and iron ions and organic ligands, leading to uneven metal distribution, increased particle size, underdeveloped pore structure, and low accessibility of active sites, thus affecting catalytic reforming activity and anti-carbon deposition ability.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

The application belongs to the technical field of ship exhaust purification, and particularly relates to a catalyst for decomposing N2O in the exhaust of a ship ammonia internal combustion engine and a preparation method thereof. 3+ By replacing Co ions in the Co3O4 spinel lattice into the lattice, the doping behavior can effectively reduce the number of hydroxyl groups on the surface of the catalyst, significantly weaken the adsorption and combination ability of water molecules, and thus improve the stability of the catalyst in a high-humidity exhaust environment. As an additive, CeO2 uses its oxygen storage capacity to promote the migration and desorption of oxygen species in the reaction, preventing the deactivation of active sites due to oxygen poisoning. The molecular sieve carrier not only provides a highly dispersed surface for the active component to prevent sintering, but also optimizes the adsorption and activation path of N2O and alleviates the poisoning effect of nitrogen-containing intermediate species or impurities in the exhaust on the Co active center during the reaction.

The invention discloses an ammonia-methanol coupling gas production device and a use method thereof, and belongs to the technical field of controllable atmosphere preparation, the ammonia-methanol coupling gas production device comprises a central combustion zone, a peripheral cracking zone and a tail mixing purification zone which are coaxially nested; the central combustion area comprises a hearth wall, and the hearth wall is of a honeycomb-shaped porous heat exchange structure; the peripheral cracking area is arranged on the outer side of the central combustion area, a catalyst bed layer of a spiral flow guide structure is arranged in the peripheral cracking area, and a high-temperature-resistant heat-conducting filling layer is arranged between the catalyst bed layer and the hearth wall of the central combustion area; the tail mixing and purifying area is connected to the downstream of the central combustion area and the peripheral cracking area and used for mixing and purifying combustion products from the central combustion area and cracking gas from the peripheral cracking area. By optimizing a heat exchange interface and a catalyst bed layer structure, the heat transfer uniformity and the response speed are enhanced, so that stable temperature control and preparation of high-purity mixed gas are realized.

The invention discloses a copper-silicon catalyst for plasma treatment as well as a preparation method and application of the copper-silicon catalyst. According to the method, a copper-silicon catalyst precursor prepared by a traditional ammonia distillation method is subjected to dielectric barrier discharge plasma treatment in the atmosphere of H2 / Ar and the like, and traditional high-temperature roasting and reduction processes are replaced. According to the method, efficient reduction and high dispersion of copper can be achieved at the room temperature, the Cu < + > / Cu0 proportion is regulated and controlled, and the strong interaction between metal and a carrier is enhanced. The catalyst is used in a reaction for preparing ethylene glycol through hydrogenation of dimethyl oxalate, the activity, selectivity and stability of the catalyst are higher than those of a traditional heat treatment catalyst, the dimethyl oxalate conversion rate reaches up to 100%, the ethylene glycol selectivity is larger than 97%, and the stability reaches 1000 h or above. The method is simple in process, low in energy consumption and environment-friendly, and has a wide industrial application prospect.

The embodiment of the application provides a kind of propane ammoxidation preparation acrylonitrile, it is related to acrylonitrile generation technical field;The method comprises: propane, ammonia and oxygen are mixed, and mixed gas is obtained;The mixed gas occurs ammoxidation under the action of metal oxide composite catalyst, and acrylonitrile is obtained;The metal oxide composite catalyst includes Mo-V base metal oxide, and also includes alkali metal or alkaline earth metal.The method of the present application has relatively mild reaction conditions, the yield can basically reach more than 60%, the selectivity can reach more than 80%, improves the raw material utilization rate, reduces energy consumption and equipment investment, thereby effectively reducing the production cost of acrylonitrile.At the same time, the process of the present application can effectively control the side reaction in the reaction process, reduce the generation of by-products, and reduce the difficulty of subsequent separation and purification of reaction products.

This invention discloses a Ni-Fe binary metal coal catalytic gasification catalyst, its preparation method, and its applications, belonging to the field of coal gasification. This invention addresses the technical problem of Ni catalysts being prone to sintering and sulfur poisoning under high-temperature conditions, leading to a significant reduction in their activity. In this invention, Ni and Fe are anchored on HZSM5 molecular sieves through physical adsorption and are highly dispersed on the surface of the HZSM5 molecular sieves, prepared using an excess impregnation method and calcination. This invention couples the lateral etching characteristics of Ni and the vertical etching characteristics of Fe, enhancing the gasification etching process of coal by the catalyst in the spatial direction, significantly improving carbon conversion rate, and providing an optimized approach for the design of coal catalytic gasification catalysts. Compared with existing catalysts, the Ni-Fe binary metal catalyst exhibits superior catalytic activity and thermal stability, while its preparation method is simple, making it a coal catalytic gasification catalyst with great development potential.

The invention discloses a molecular sieve catalyst as well as a preparation method and application thereof, and belongs to the technical field of petrochemical engineering catalysts. The preparation method adopts an etching-modification-confinement integrated strategy, and comprises the following steps: firstly, carrying out controllable etching on a pure silicon Silicalite-1 (S-1) molecular sieve by using a mixed alkali solution of alkali metal hydroxide and ethidene diamine, and in-situ constructing silicon hydroxyl nest defects in a skeleton and remaining atomic-scale dispersed alkali metal; and loading platinum and second metal salt on the etched molecular sieve, drying, calcining and reducing to obtain the final catalyst. The confinement microenvironment is pre-created through the etching step, precise positioning and strong interaction of platinum, second metal and alkali metal are achieved, and the problems that a traditional platinum-based catalyst is difficult in propane initial activation, low in propylene selectivity and poor in stability are effectively solved. The catalyst shows high conversion rate, high selectivity and excellent thermal stability in propane dehydrogenation reaction.

The invention relates to the technical field of catalysts, in particular to a palladium-nickel catalyst for synthesizing vinyl acetate and a preparation method thereof.According to the catalyst, a composite carrier of nanometer aluminum oxide and a ZSM-5 molecular sieve serves as a carrier, Pd and Ni serve as bimetallic main active components, and potassium acetate and La2O3 serve as auxiliary active components. The preparation method comprises the key steps of carrier pretreatment, step-by-step impregnation loading of active components, roasting activation in an acetic acid-containing partial pressure atmosphere and the like. A Pd-Ni system is adopted to replace a traditional expensive Pd-Au system, the cost of precious metal is remarkably reduced by 40%-50%, meanwhile, the catalytic activity, selectivity and stability of the catalyst are comprehensively improved through the synergistic effect of all the components, and the catalyst is particularly suitable for industrial production of synthesizing vinyl acetate through an ethylene gas phase method.

The invention relates to the technical field of carbon dioxide capture and adsorption, in particular to a calcium oxide-based adsorbent for high-temperature carbon dioxide capture and a preparation method. The adsorbent comprises a biomass calcium carbonate matrix, a skeleton proppant, a Ce-Zr-Cu composite oxide bifunctional aid, a conductive dispersant, a macropore-mesopore-micropore hierarchical porous structure formed by biomimetic mineralization of a biological template agent, and an amino functional group grafted by a surface modifier. The biomass calcium carbonate matrix is formed by compounding egg shells, shells and coral bones according to the mass ratio of 1: 1: 0.5; the skeleton proppant is formed by compounding a ZSM-5 molecular sieve and mesoporous gamma-aluminum oxide according to a mass ratio of 2: 1; in the scheme, biomimetic mineralization is realized by compounding a ZSM-5 / gamma-alumina skeleton and a Ce-Zr-Cu ternary auxiliary agent, introducing a PAN-based nitrogen-doped carbon network and matching with a diatom-egg white biological template, and APTES + PEI surface modification is performed, so that the problems of poor sintering, poor circulation, agglomeration and the like of a traditional adsorbent are solved in a targeted manner, double-temperature-zone adsorption is also realized, and the comprehensive performance is greatly improved.

The application provides a continuous casting production method of tinplate, which comprises the steps of dynamic control of a pulling speed, linkage control of cooling, dynamic adjustment of an insertion depth of a submerged nozzle and dynamic argon blowing, wherein the pulling speed control is based on the maximum section steel flow, the target pulling speed is calculated reversely according to the actual section, and the steel flow of each section is constant; the cooling water flow is compensated in linkage with the increment of the pulling speed, and the bulging of the shell is inhibited; the insertion depth of the nozzle adopts a one-way increasing insertion mode from shallow to deep in multiple stages; and the argon blowing flow is adjusted in stages according to the fluctuation of the crystallizer liquid level. The application can reduce the nozzle clogging area by more than 50%, the standard rate of liquid level fluctuation is increased to 95%, the continuous casting castability and the surface quality of the casting blank are significantly improved, and the application is suitable for the efficient and stable continuous casting production of tinplate and other aluminum-containing steels.

The application provides a high-entropy niobate ceramic with high-temperature water vapor sintering resistance and high fracture toughness, a preparation method and application thereof, and belongs to the technical field of thermal barrier coating materials for hydrogen hybrid combustion engines.The high-entropy niobate ceramic prepared by the application can promote crack deflection and bridging through ferroelastic domain and super-dense dislocation, consume crack propagation energy, and thus improve the fracture toughness of the coating, so that the fracture toughness of the coating is comparable to that of YSZ; on the other hand, the high-entropy niobate ceramic can form a covalent bond with water vapor adsorbed on the surface, the covalent bond has strong binding force, and the hydroxyl group cannot move; meanwhile, high-temperature water vapor can reduce the surface energy of the high-entropy niobate ceramic, promote the diffusion of particles to the neck, increase the curvature radius of the neck, and reduce the diffusion driving force, so as to inhibit sintering; the high-entropy niobate ceramic is doped with multi-element rare earth elements to obtain an "entropy-stable" high-entropy niobate, so that the high-entropy niobate ceramic material has high-temperature phase stability, high-temperature water vapor sintering resistance, high-temperature thermal insulation performance and high fracture toughness.

The invention relates to the technical field of phased array radar power supply and distribution, in particular to an intelligent multi-stage slow start device applied to a radar power supply and distribution system, and the intelligent multi-stage slow start device is connected between an input terminal and an output terminal of the radar power supply and distribution system. The intelligent multi-stage slow start device comprises a main loop module, a state acquisition module and a decision control module, the main loop module is composed of a main relay and n slow start branches which are connected in parallel. Each slow start branch is composed of a branch relay and a current-limiting resistor which are connected in series. The state acquisition module is composed of a voltage acquisition unit used for acquiring output voltage in real time and a temperature acquisition unit used for acquiring the temperature of each current-limiting resistor in real time. The decision control module is composed of a central processing unit, a voltage reference adjusting unit, a comparison unit and a driving unit, and is used for controlling the on-off of the branch relays of the n slow start branches. According to the device, low-cost, low-heat-consumption and high-reliability slow start is realized, and higher-level system protection is provided.

The application relates to the technical field of alumina modification, and particularly discloses a synthesis method of modified alumina, which aims to solve the problems of insufficient thermal stability of alumina and uneven dispersion of modified elements in the prior art.The method comprises the following steps: adding a metal organic compound into an aluminum sulfate aqueous solution in advance before the aluminum sulfate aqueous solution and a sodium metaaluminate aqueous solution are subjected to a parallel flow reaction; adding an aminopropylsilazane during the parallel flow reaction; after the parallel flow reaction is completed, adding a hydroxylated quaternary ammonium base into the generated pseudo-boehmite slurry to perform dispersion treatment, and then adding a silicon-containing compound to perform a doping reaction; and finally, calcining the pseudo-boehmite powder to obtain modified alumina.The in-situ and uniform modification of the alumina is realized by introducing the modified components with synergistic effects in different stages and in a specific order, the thermal stability of the final product is significantly improved, and the process flow is short and the cost benefit is high.

The application belongs to the technical field of hydrogen production, and discloses a preparation method of a nickel-based catalyst based on expanded graphite dispersion and application of the catalyst in hydrogen production by ammonia cracking, which comprises the following steps: (1) uniformly dispersing expanded graphite in deionized water; (2) adding nickel chloride hexahydrate and cerium chloride heptahydrate to uniformly disperse on the surface of the expanded graphite; (3) adding sodium borohydride to the mixture to perform reduction, centrifugation and washing; (4) calcining the obtained solid by centrifugation, and oxidizing and crystallizing Ce(III) into CeO2 under a high-temperature environment; and (5) reducing to obtain a Ni / CeO2-expanded graphite catalyst under pure hydrogen condition. The three-dimensional precursor is formed by the reduction method of nickel chloride, cerium chloride and expanded graphite, Ni and CeO2 are dispersed and fixed on the expanded graphite, and through the confinement effect and electronic transfer synergistic effect of the expanded graphite, the catalyst exhibits excellent catalytic activity in the ammonia decomposition reaction.

The application discloses a preparation method of a monopropellant monolithic catalyst, selects a honeycomb ceramic carrier which has good heat conductivity and heat shock resistance and can keep stable structure in a high-temperature environment, coats a modified alumina coating on the surface of the ceramic carrier, and then loads noble metal as a catalytic active component through an impregnation method, so that the connectivity between the noble metal active component and the carrier is enhanced, the noble metal loading capacity is increased, the coating firmness is improved, the catalyst breakage rate is significantly reduced, and the catalyst thermal stability is improved. The monolithic catalyst prepared by the application has high catalytic activity, good coating firmness, and the modified alumina coating can also increase the strength of the carrier, can effectively inhibit sintering and phase change of the carrier in a high-temperature environment, improve the thermal stability, and is not easy to break in a high-temperature environment.

This invention discloses an iron-based multimetallic catalytic material, its preparation method, and its application, belonging to the field of catalyst preparation technology. The preparation method includes: dissolving two or more water-soluble metal salts with different hydroxide solubility products in water to obtain a mixed solution A; dissolving potassium ferrate in cold water to obtain solution B; pouring solution B into mixed solution A under stirring to obtain mixed solution C; allowing the solution to settle at low temperature until the supernatant changes color from dark purple to light purple and reaches neutral pH, then filtering, washing, and drying to obtain a precursor; calcining the precursor in a mixed atmosphere of hydrogen and argon to obtain the iron-based multimetallic catalytic material. This material has a multi-layered enclosed microstructure, with metal oxides of high hydroxide solubility products located on the periphery and those of low solubility products located inside, achieving a gradient arrangement and synergistic effect of metal components. The process of this invention is simple and the conditions are mild. The obtained catalyst exhibits high catalytic activity, high selectivity, and excellent stability in the countercurrent water-gas reaction.

This invention discloses a dual-dispersed hydroxyapatite-supported nickel catalyst, its preparation method, and its application in methane dry reforming. The invention employs morphology control and in-situ nickel framework doping strategies to replace calcium ions in the hydroxyapatite support, loading the active nickel component via a coupled impregnation process. Nickel achieves dual, efficient dispersion on the hydroxyapatite support surface and at lattice sites, inhibiting particle sintering during the reaction, enhancing electronic synergy, and improving anti-coking ability. In methane dry reforming, it exhibits advantages such as high conversion rate, high stability, low coking, and long lifespan, significantly improving catalytic activity and high-temperature stability. This invention's process is green, low-cost, and easily scaled up, overcoming the bottlenecks of traditional nickel-based catalysts' sintering, coking, and high cost due to precious metals, providing a new, efficient, and stable catalytic solution for high-temperature methane dry reforming.

The application belongs to the technical field of catalytic material synthesis, and discloses a preparation method of a Ni-Co bimetallic catalyst for dry reforming of methane and application thereof; the Ni-Co bimetallic catalyst is prepared by using Ni and Co as active components of a dry reforming of methane catalyst and an alkali earth metal as a carbon dioxide adsorbent by an impregnation method; the catalyst prepared by the application not only effectively overcomes the problem of poor stability of a Ni-based catalyst, but also promotes carbon dioxide adsorption and improves the efficiency of dry reforming of methane; and the method for preparing the Ni-Co bimetallic catalyst is simple and low in cost, and the catalyst exhibits excellent catalytic performance and stability in a dry reforming of methane reaction.

The invention discloses an iron-based multi-metal catalytic material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: dissolving more than two metal water-soluble salts with different hydroxide solubility products in water to obtain a mixed solution A; dissolving potassium ferrate in cold water to obtain a solution B; pouring the solution B into the mixed solution A while stirring to obtain a mixed solution C; after the color of the supernate becomes light purple from dark purple and the pH is neutral, suction filtration, washing and drying are performed, and a precursor is obtained; and calcining in a mixed atmosphere of hydrogen and argon to obtain the iron-based multi-metal catalytic material. The material is of a multi-layer surrounding type microstructure, metal oxides with high hydroxide solubility products are located on the periphery, metal oxides with low hydroxide solubility products are located inside, and gradient arrangement and synergistic effect of metal components are achieved. The method is simple in process and mild in condition, and the obtained catalyst shows high catalytic activity, high selectivity and excellent stability in the reverse water gas reaction.

The application discloses a supported metal element synergistically modified copper-based catalyst and a preparation method and application thereof. The catalyst is composed of metal copper, metal gallium, an auxiliary element M and a carrier SiO2. In the preparation method, a Cu-Ga catalyst precursor is prepared through an ammonia evaporation method, and then the auxiliary element is added through ball milling. Mechanical shearing force and impact generated in the milling process can promote sufficient contact and uniform mixing of the auxiliary element and the precursor, so that the auxiliary element is more uniformly distributed and a strong interaction is formed. Under the condition that the hydrogen ester ratio is about 200, the application can still maintain a high methyl 3-hydroxypropionate conversion rate and 1,3-propanediol selectivity.

This invention relates to the field of catalyst technology, specifically to a method for preparing and applying a modified metal sulfide catalyst for the co-conversion of acidic natural gas. The preparation method includes: S1. Dissolving ammonium molybdate tetrahydrate in a modified solvent and stirring until completely dissolved to obtain a transparent and homogeneous solution; S2. Adding 2-3 parts of a modified support precursor to the solution and transferring it to an autoclave for reaction for 22-24 hours; S3. Centrifuging the solution and washing the precipitate 2-3 times with deionized water and anhydrous ethanol, respectively, followed by drying and grinding to obtain the modified metal sulfide catalyst. This invention utilizes concentrated light technology to synergistically apply light and heat energy to the reaction system, achieving high-efficiency conversion at a lower temperature (450-550℃) and atmospheric pressure compared to traditional thermocatalysis, significantly reducing energy consumption. It is the first catalyst designed for CH4. 4 and H 2 A metal sulfide composite catalyst system for S-concentrated photocatalytic co-conversion converts two harmful / low-value gases into high-value CS in one step. 2 and clean H 2 This has enabled "waste treatment" and resource recycling.

This invention belongs to the field of catalytic materials and catalyst preparation technology, specifically relating to a method for preparing a Co / Al2O3 propane dehydrogenation catalyst. This method employs a crystal reconstruction method to realize the presence of CoO in Co / Al2O3. x Targeted regulation of species. Using the preparation method described in this invention, the cobalt species in the catalyst can be precisely controlled, resulting in a catalyst with high propylene selectivity (93%) and high propane conversion (23%) in the propane dehydrogenation reaction. Simultaneously, this method effectively solves the problem of coking in traditional dehydrogenation catalysts, opening up new avenues for improving catalytic performance.

The application discloses a kind of Ce-La composite carrier load Cu-Ni bimetallic photo-thermal catalyst and its preparation method, for the defects of existing pure carrier oxygen vacancy concentration fixed, active metal is easy high-temperature agglomeration, catalytic activity and stability are insufficient, the Ce-La composite carrier is constructed by La doping modification in the application, and Cu-Ni bimetallic is formed 8Cu2Ni / aCebLa catalyst.La exists in the form of La-Ce-O solid solution, significantly improves the carrier oxygen vacancy concentration and activation capacity, while strengthening metal-carrier interaction, anchoring bimetallic particles to inhibit sintering, improve catalyst stability.

This invention relates to a C x N y This invention relates to a Pt@C fuel cell catalyst and its preparation method, belonging to the field of fuel cell catalyst technology. First, Pt@C is synthesized via a solvothermal reaction using ethylene glycol reduction. Then, it is mixed with a nitrogen-containing polymer material and cobalt chloride hexahydrate, and subjected to reduction in a reducing atmosphere, high-temperature treatment, carbon pyrolysis, and alloying to obtain porous nitrogen-containing carbon-coated Pt@C. x N y @PtCo / C catalyst. In the prepared catalyst, the porous coating layer significantly reduces the poisoning of catalyst particles by resin during fuel cell operation, improves cell activity, and extends cell life, exhibiting excellent activity and durability.

The invention relates to a rapid preparation method of hierarchical porous carrier loaded atomic-scale dispersion high-stability Ru-based nano enzyme. The method comprises the following steps: firstly, constructing a hierarchical porous HZIF-67 carrier with through pore channels; then loading the Ru precursor on the carrier, and coating and fixing with glucuronic acid; and finally, carrying out instantaneous heat treatment by adopting an ultrafast Joule heat shock technology to obtain the nano enzyme with Ru monoatoms uniformly dispersed on the surface and bulk phase of the Co3O4 carrier in one step. The Ru monatomic nano-enzyme prepared by the invention shows unique advantages in electronic structure and coordination environment, the activity of the Ru monatomic nano-enzyme can be regulated and controlled in a relatively wide pH range, and the Ru monatomic nano-enzyme shows excellent peroxidase-like activity under close physiological conditions. The characteristic successfully overcomes the bottleneck that pH is not matched when the glucose oxidase is combined with traditional glucose oxidase, so that the glucose oxidase has high sensitivity and reliability in glucose colorimetric detection, the detection limit is as low as 0.85 M, and the glucose oxidase has huge practical application value.