346 results about "Alloy catalyst" patented technology

The invention provides a preparation method of a cobalt-based bimetallic alloy positive electrode lithium supplement composite material and an application technology of the cobalt-based bimetallic alloy positive electrode lithium supplement composite material in a battery. The lithium-supplementing composite material is a lithium salt, a cobalt-based bimetallic alloy catalyst for promoting low-pressure decomposition of the lithium salt, and a positive electrode material. The lithium salt is lithium oxalate, the cobalt-based bimetallic alloy catalyst is prepared from nitrogen and sulfur co-doped carbon impregnated in a transition metal salt solution through freeze drying and high-temperature calcination, and the positive electrode material comprises one of lithium iron phosphate, lithium cobalt oxide and ternary high nickel (LiMO2, M = Ni, Co and Mn). When the lithium supplement agent is applied to a secondary lithium ion battery, the decomposition voltage of the lithium supplement agent can be reduced, the irreversible loss of capacity is reduced, and the initial coulombic efficiency is improved.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The invention belongs to the technical field of catalysts, and discloses a rare earth platinum alloy catalyst and a preparation method and application thereof. The catalyst comprises a nitrogen-doped carbon carrier, and a PtGd alloy and a Ni elementary substance are loaded on the nitrogen-doped carbon carrier. The preparation method comprises the following steps: (1) preparing a Gd-ZIF material; and (2) uniformly mixing the Gd-ZIF, the platinum source solution and the nickel source solution, carrying out vacuum drying treatment, heating to 700-1000 DEG C in a reducing atmosphere, keeping the temperature for 1-2 hours, and cooling to room temperature to obtain the rare earth platinum alloy catalyst. The invention discloses application of a rare earth platinum alloy catalyst which is used as a cathode oxygen reduction reaction catalyst of a hydrogen fuel cell. The preparation method disclosed by the invention is simple to operate and can be used for large-scale preparation; the Pt content of the rare earth platinum alloy catalyst prepared by the method is reduced to 13%, and the cost of raw materials is directly and greatly reduced; the maximum half-wave potential of the rare earth platinum alloy catalyst can reach 0.93 V vs.RHE which is far higher than that of commercial Pt / C.

The invention relates to a membrane electrode and application thereof in deuterium-enriched water, and belongs to the field of clean energy development and utilization. The membrane electrode comprises a proton exchange membrane, an anode catalyst and a cathode catalyst, the anode catalyst is an iridium / iridium oxide catalyst with a three-dimensional porous network structure, and the cathode catalyst is a platinum-ruthenium alloy catalyst. The preparation method comprises the following steps: coating one side of the N117 proton exchange membrane with the anode catalyst, coating the other side of the N117 proton exchange membrane with the cathode catalyst, and then performing hot pressing to prepare the membrane electrode. The method comprises the following steps: assembling a membrane electrode into an electrolytic cell, and electrolyzing water by using the electrolytic cell to realize deuterium enrichment. The membrane electrode and the electrolytic cell are reasonable in design, the preparation process is simple and controllable, and the obtained product is high in efficiency and long in service life when used for enriching deuterium and facilitates industrial application.

The invention discloses a surface oxidation monatomic nano-alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of advanced nano-energy materials and electro-catalysis. A surface-oxidized monatomic nano-alloy catalyst comprises a hydroxylated carbon nanotube carrier and bimetallic nano-alloy particles loaded on the hydroxylated carbon nanotube carrier, in the bimetallic nano-alloy particles, non-noble metal elements are dispersed in noble metal nano-particles in a monatomic form, the size of the bimetallic nano-alloy particles is 3-4 nm, and the surface-oxidized monatomic nano-alloy catalyst is prepared from a surface-oxidized monatomic nano-alloy catalyst. An oxide layer with the thickness of 0.3-0.6 nm is arranged on the surface of the bimetallic nano-alloy particle; the loading amount of the noble metal is 5-15wt%. Ruthenium and other non-noble metal elements are alloyed and anchored on the carbon material substrate, the conductivity of the catalyst can be greatly improved, the size of alloy particles is accurately controlled within the range of 3-4 nm, active sites can be exposed to the maximum extent, and structural stability is considered.

The preparation method comprises the following steps: 1) mixing carbonate, a copper precursor, a silver precursor and a supporting electrolyte, and heating the mixture to 400-600 DEG C in a protective atmosphere to obtain a molten electrolyte; 2) introducing a protective atmosphere into a gas washing bottle containing deionized water, and continuously introducing gas flowing out of the gas washing bottle into the bottom of the molten electrolyte; and (3) taking a graphite sheet or a metal sheet as a cathode, taking a graphite rod as an anode, applying 1.8-2.5 V constant voltage or 100-300 mA. Cm <-2 > constant current to electrolyze for 0.5-10 hours, taking out the cathode, scraping off powder on the surface, and performing ultrasonic washing and drying. The preparation of the high-load and high-dispersion copper-silver double-monatomic alloy catalyst is realized, and the preparation method has the advantages of simple synthesis method, good process controllability, low production cost, environmental friendliness, high electrolytic efficiency and the like, and has a wide application prospect.

The invention discloses a NiCu-based alloy catalyst for preparing high-value products through natural gas decarbonization and application of the NiCu-based alloy catalyst, and belongs to the technical field of natural gas high-value catalytic conversion. The preparation method of the NiCu-based alloy catalyst comprises the following steps: (1) adding nickel nitrate hexahydrate and urea into hot water, adding ethylene glycol, carrying out a stirring reaction at 120-150 DEG C, and calcining the obtained intermediate to obtain a nickel oxide precursor; (2) adding a copper nitrate aqueous solution and ammonia water into the nickel oxide precursor, so that copper ions are anchored on the surface of nickel oxide, drying and calcining to obtain a Ni-Cu alloy oxide precursor; and (3) adding the Ni-Cu alloy oxide precursor, bismuth trioxide and metallic tin into deionized water, adding a complexing agent, carrying out ultrasonic treatment, and carrying out H2 reduction calcination on the obtained precipitate to obtain the Ni < x > Cu < y > Bi < z > Snm alloy. The NiCu-based alloy catalyst is used in a natural gas decarburization high-value product preparation reaction, and the natural gas decarburization reaction is sufficient, and long-term efficient conversion and stable operation are achieved by combining the synergistic effect of ultrasonic waves and an alternating magnetic field.

The present invention belongs to the technical field of electrolytic water catalysts and relates to a low-Pt high-entropy alloy electrolytic water catalyst, a preparation method, and an application thereof. Five metal elements, namely, Mn, Ni, Cu, Pt, and any one of La, Mo, Co, V, and Ti, are selected and combined to prepare an efficient and stable high-entropy alloy catalyst. No pH adjustment is required during the process, and the process is simple, easy to operate, and the preparation cost is low, thus enabling industrial production. The MnNiCuPt (La, Mo, Co, V, Ti) high-entropy alloy catalyst prepared by the present invention exhibits excellent electrolytic water performance, thereby reducing the catalyst cost and improving the catalytic performance.

The invention provides a hydrogen fuel cell catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts, the catalyst comprises an N atom modified carbon carrier and platinum alloy nanoparticles loaded on the surface of the carbon carrier, the platinum alloy nanoparticles are binary or multicomponent alloys formed by Pt and metal M, the molar ratio of platinum to the metal M is (0-10): 1, and the molar ratio of platinum to metal M is (0-10): 1. The weight ratio of the N atom modified carbon carrier to the platinum alloy nanoparticles is (25-80): (75-20). According to the preparation method of the hydrogen fuel cell catalyst, the N-modified carbon-supported PtFe alloy is prepared by a two-step pyrolysis method, so that the use amount of Pt is effectively reduced, the cost is controlled, and the utilization rate of Pt is increased; through the strong coordination capability of the 1, 10-phenanthroline, the formed Fe-N-C layer can restrain the growth and agglomeration of the PtFe alloy nanoparticles, the adsorption to a reaction intermediate is weakened, and the oxygen reduction activity and stability of the alloy catalyst are improved.

The invention provides a gradient composite graphene electrolysis electrode plate and an in-situ preparation method thereof. The electrode plate comprises a metal conductive base material (such as titanium alloy), a porous ceramic skeleton layer (Al2O3-40% ZrO2, the porosity of which is 30 + / -5%), a chemical copper plating layer for filling pores, an electroplated nickel-ruthenium alloy catalytic layer (Ni: Ru = 9: 1) and 3-5 graphene functional layers (ID / IG is less than or equal to 0.08) grown in situ, wherein the porous ceramic skeleton layer (Al2O3-40% ZrO2) is laser-cladded on the surface of the porous ceramic skeleton layer (Al2O3-40% ZrO2). The preparation method comprises the following steps: performing laser cladding on a ceramic skeleton, wherein the power density is 300-500W / mm < 2 >, and sintering at 1600 DEG C to form metallurgical bonding; gradient plating: electroless copper plating (containing nano-diamond enhancement) and pulse electroplating of Ni Ru (duty ratio is 1: 5); and performing directional CVD growth: after reducing the catalyst layer by H2 at 1050 DEG C, introducing CH4 / H2 (the volume ratio is 1: 4) in a pulse manner, and realizing full coverage of the inner wall of the mesh by vortex air intake. The technical effects are as follows: (1) the overpotential of chlorine evolution in saturated salt water at 80 DEG C is as low as 268mV (1A / cm < 2 >); (2) strong acid environment service life gt; the time is 100 thousand hours (12 times that of the national standard); (3) the production cost is lt; and 620 / m < 2 > (90% lower than that of a traditional ruthenium-iridium coating). The problems of graphene transfer damage and special-shaped electrode covering are solved.

The invention relates to a multi-conductive-agent composite conductive paste for a lithium battery and a preparation method of the multi-conductive-agent composite conductive paste, and belongs to the technical field of lithium battery conductive pastes.The multi-conductive-agent composite conductive paste is characterized in that an iron-molybdenum catalyst is loaded on expanded graphite, then vertical orientation carbon nanotubes and transverse graphene blades are grown in situ, the specific surface area is increased, and the expanded graphite serves as a layered carrier; a metal alloy catalyst can be uniformly loaded in natural pores of the carbon nanotube, a layered framework is kept from collapsing at a high temperature, support is provided for directional growth of a carbon material, electrons can be rapidly transmitted along the carbon nanotube when the composite conductive paste is prepared, gaps of the carbon nanotube are filled by graphene blades, a breakpoint-free conductive network is formed, and the composite conductive paste is prepared. And meanwhile, abundant pores provide channels for lithium ion diffusion, so that the conductive efficiency is improved from the source of the structure, and abundant specific surface area and subsequent nitrogen and sulfur loading provide sufficient sites.

The invention belongs to the technical field of catalytic materials, and particularly relates to a nickel-iron-cobalt entropy alloy nanowire three-dimensional interconnection grid film and a preparation method and application thereof. The preparation method comprises the following steps: taking an aluminum sheet containing copper impurities as a substrate, and preparing a three-dimensional ordered porous aluminum oxide template through anodic oxidation; then, the nickel-iron-cobalt entropy alloy nanowire is prepared in a pore channel limited range through direct current co-electrodeposition; the nickel-iron-cobalt entropy alloy nanowire three-dimensional interconnection grid film is obtained after the aluminum substrate and the 3D-AAO template are removed, the material is based on the mixed entropy effect and structural integrated design and can be directly used as a self-supporting electrode for efficiently and stably electrolyzing water for oxygen evolution, the three-dimensional grid structure and the self-supporting characteristic of the material promote electrolyte transmission and gas product desorption, and the oxygen evolution efficiency is improved. The mass transfer efficiency is improved, the use of a traditional binder is avoided, and the electrode stability is enhanced; the problems that an existing medium-entropy alloy catalyst is high in synthesis energy consumption, the catalytic activity is poor under the industrial-grade large-current working condition, active substances fall off in the reaction and the like are solved.

The invention belongs to the technical field of biological medicine, and discloses a preparation method of ionizable cationic lipid. The preparation method comprises the following steps: reacting 7-oxoheptyl caprate with hydroxylamine or hydroxylamine salt in the presence of alkali in the presence of a reducing agent and a cobalt-ruthenium alloy catalyst; (9Z, 12Z)-octadecane-9, 12-dienal is added into the reaction product, the reaction continues in the presence of a reducing agent, and a hydroxylamine derivative intermediate is obtained; and performing amidation reaction with 4-dimethylaminobutyric acid or hydrochloride thereof in the presence of a condensing agent and a catalyst to obtain the ionizable cationic lipid. The invention also discloses an application of the ionizable cationic lipid, the lipid nanoparticle composition or the mRNA-loaded lipid nanoparticles obtained by the preparation method in preparation of a pharmaceutical composition or a kit for mRNA delivery. The LNP provided by the invention has good physicochemical properties, biocompatibility and efficient mRNA encapsulation and intracellular delivery capabilities, and can be applied to preparation of pharmaceutical compositions or kits for mRNA delivery.

The invention provides a nickel-molybdenum-based rare earth element doped core-shell catalyst for hydrogen production by alkaline electrolysis of water as well as a preparation method and application of the nickel-molybdenum-based rare earth element doped core-shell catalyst, and belongs to the technical field of hydrogen production by alkaline electrolysis of water. Aiming at the problems that Mo is easy to dissolve out in an alkaline medium, the stability is poor, the catalyst depends on a substrate, the preparation is complicated and the like in the existing nickel-molybdenum alloy catalyst, a Ni4Mo alloy is constructed as a core through trace RE doping, coprecipitation and reducing atmosphere annealing; the surface is coated with a core-shell structure of RE-MoO3-x rich in oxygen vacancies, a RE-MoO3-x shell layer accelerates water dissociation and generates a synergistic effect with a Ni4Mo core to drive a hydrogen intermediate to migrate to the core to realize efficient hydrogen evolution, and a formed Mo-O-RE bond can anchor Mo and inhibit the Mo from being dissolved out. When the catalyst is used for hydrogen production by alkaline electrolysis of water, the overpotential is as low as 53mV in 1M KOH under the current density of 10mA / cm < 2 >, the catalyst can stably run for over 300h, and the catalyst has high activity and high stability and is simple to prepare.

The invention discloses a mercaptan-coated proton exchange membrane fuel cell cathode catalyst slurry, a preparation method and a membrane electrode, and the method comprises the following steps: step 1, dispersing carbon black in a water-alcohol solution and a surfactant to obtain a carbon black solution; 2, respectively preparing a platinum precursor solution and a cobalt precursor solution; 3, mixing the carbon black solution, the platinum precursor solution and the cobalt precursor solution, removing the solvent, and performing thermal reduction in reducing gas to obtain a binary ordered alloy catalyst; the temperature of the thermal reduction ranges from 700 DEG C to 1000 DEG C, and the time ranges from 0.5 h to 2 h. Step 4, dissolving the mercaptan powder in a mixed solvent of deionized water and isopropanol according to a ratio of 1: 1 to prepare a 1wt% mercaptan-containing solution; then, cooling the solution to 5 DEG C until solid substances are completely dissolved; and step 5, fully mixing the catalyst with the prepared mercaptan solution. And step 6, removing excessive mercaptan, and centrifuging the solution at the rotating speed of 10000 revolutions per minute for 10 minutes. And drying the precipitate in a vacuum drying oven for 12 hours to obtain the catalyst. The mercaptan-coated binary alloy catalyst prepared by the method can avoid poisoning effect of sulfonate radicals on Pt, improves expression of catalyst activity, and is helpful for improving performance of a fuel cell.

The invention relates to a ternary platinum-based ordered alloy catalyst, a preparation method thereof and a fuel cell, and the preparation method comprises the following steps: ball-milling and uniformly mixing an organic small molecule ligand, a Pt precursor, an M1 precursor, an M2 precursor and a carbon carrier, and calcining to obtain the ternary platinum-based ordered alloy catalyst, the small organic molecule ligand comprises doping elements, and the doping elements comprise an N element and / or an S element; in the precursors of M1 and M2, M1 and M2 are each independently a transition metal element. According to the preparation method, ball milling and high-temperature calcination are combined, small organic molecule ligands are added in the ball milling and mixing stage to participate in the reaction, coordination bonds can be formed among the small organic molecule ligands, Pt particles and transition metal particles, S and / or N in the small organic molecule ligands are doped into a bulk phase of alloy particles, meanwhile, the phenomenon of catalyst agglomeration caused by ball milling can be effectively prevented, and the catalyst stability is improved. No solvent is needed in the preparation process, especially no organic solvent is used, and the preparation method is simple, safe and suitable for large-scale production.

Compositions and methods for the catalysis of methane pyrolysis. Compositions include a catalyst that includes a medium entropy alloy particle. Methods include catalyzing the pyrolysis of methane using the catalyst.

The invention discloses a citric acid coordination regulated amino-functionalized palladium-silver alloy catalyst as well as a preparation method and application thereof. Nitrogen-doped carbon is used as a carrier, and the palladium-silver alloy catalyst is constructed through coordination-confinement in-situ reduction of citric acid. According to the preparation method, citric acid is introduced, and synergistic interaction of sub-nano-scale dispersion and efficient interface mass transfer is achieved through dual synergistic regulation and control of the size and the interface; the coordination effect enables the palladium-silver alloy to achieve sub-nano-scale superfine dispersion; as a competitive hydrogen bond acceptor / donor, the polycarboxyl group can effectively break an interface hydrogen bond network and inhibit the formation of a tight gas film from the source. The mechanism ensures that the catalyst is always in full contact with a mixed aqueous solution containing formic acid and formate and hydrogen is quickly released during formic acid dehydrogenation hydrogen production reaction, so that the catalyst has excellent anti-poisoning cycling stability while keeping high intrinsic activity, and the technical problem that high activity and long-term stability are difficult to consider at the same time is solved.

The invention discloses an ultra-dispersion storage type solid-liquid two-phase gallium-based alloy catalyst and a preparation method thereof. The catalyst takes liquid metal gallium as a storage container, and binary gallium-based alloy is uniformly dispersed in the liquid metal gallium. The ultra-dispersed storage type gallium-based alloy catalyst is prepared through step-by-step ball milling, gradient heating, gradient cooling and grinding redispersion, and uniform distribution of gallium-based alloy in liquid metal gallium is achieved. An internal alloy is segregated on the surface of liquid metal Ga through an electrochemical activation means, and efficient catalytic reaction is achieved. According to the storage type catalyst prepared by the process, the internal alloy is uniformly dispersed, is not agglomerated, and can be segregated on the surface of Ga for multiple times, so that the effect of storing sites is effectively realized. The segregated alloy is in a cluster shape, and a large number of agglomerated blocks do not exist. The ultra-dispersed storage type solid-liquid two-phase gallium-based alloy catalyst can realize repeated reactivation after surface sites fall off and are inactivated, so that internal storage sites are separated out again, and the catalytic activity is recovered.

The application provides a preparation method of a platinum-cobalt alloy catalyst, which comprises the following steps: preparing a hexadecyl trimethyl ammonium bromide clear solution; preparing a platinum compound, a transition metal cobalt salt and a dimethyl imidazole dispersion solution; adding the dispersion solution into the hexadecyl trimethyl ammonium bromide clear solution in sequence, stirring, adding a carbon black, a ketchen black, a cabot black or a carbon nanotube slurry, and continuously stirring to obtain a mixed solution I; then centrifuging, vacuum drying and grinding the mixed solution I to obtain an intermediate powder; then performing a different temperature staged calcination on the intermediate powder under a reducing / inert atmosphere to obtain an ordered low platinum-cobalt alloy catalyst powder; and then performing an acid washing, suction filtration, vacuum drying and grinding on the ordered low platinum-cobalt alloy catalyst powder to obtain a catalyst product which can be used in a fuel cell. The platinum-cobalt alloy catalyst prepared by the application can be applied to a proton exchange membrane fuel cell as a cathode oxygen reduction catalyst, and the platinum-cobalt alloy catalyst can improve the utilization rate, catalytic activity and durability of the noble metal Pt in the fuel cell cathode ORR catalyst, and can reduce the manufacturing cost and use cost of the fuel cell.

The present application discloses a two-phase sulfate reduction device and treatment method for preventing sludge calcification, which belongs to the technical field of wastewater treatment in environmental engineering. The present application combines a two-phase sulfate reduction anaerobic reactor with an alloy catalyst, and reasonably arranges a two-phase connection unit of the alloy catalyst within the device body. By using the special functions of the porous alloy catalyst material to release free electrons into a body of water and polarize the body of water, the electrostatic potential of the body of water is changed, sludge calcification during the wastewater treatment process is prevented, and the treatment efficiency of the anaerobic system for sulfate organic wastewater is ensured.

The invention belongs to the technical field of fuel cells, and particularly relates to a high-durability alloy catalyst and a preparation method and application thereof. The prepared high-durability alloy catalyst comprises a metal monatomic carrier Q-N-C and PtM alloy nanoparticles loaded on the metal monatomic carrier Q-N-C, the metal monatomic carrier Q-N-C is composed of a nitrogen-doped carbon carrier N-C and a metal monatomic Q loaded on the nitrogen-doped carbon carrier N-C, and the PtM alloy nanoparticles are composed of Pt salt and M metal salt; the related preparation method can effectively adjust the interaction between the carrier and the alloy, has high durability, and can solve the problem that the second phase metal in the alloy catalyst is easy to dissolve out by using the monatomic catalyst as the carrier of the catalyst and using the carrier as a receiver for receiving the dissolution of the second phase of the alloy catalyst. Meanwhile, excellent electrochemical performance and relatively high stability are realized.

The invention relates to the technical field of catalytic materials, in particular to a monatomic alloy catalyst and a preparation method and application thereof.The preparation method comprises the steps that a first solution obtained by mixing cobalt salt, silver salt and a solvent is mixed with a second solution obtained by mixing 2-methylimidazole and a solvent, stirring treatment is conducted, and a first precursor solution is obtained; and carrying out first heat treatment on the obtained precipitate in an inert atmosphere to obtain the fcc Ag1Co / C monatomic alloy catalyst. A first solution and a second solution are mixed to obtain an Ag / ZIF-67 precipitate which is a Co-based zeolite imidazate framework structure composite material, an organic framework of the Co-based zeolite imidazate framework structure composite material is decomposed and carbonized through high-temperature heat treatment, meanwhile, Ag and Co species are reduced and converted into nanoparticles, and the Ag / ZIF-67 precipitate is obtained. And finally, the composite material catalyst with the Ag1Co monatomic alloy nanoparticles embedded into the nitrogen-doped carbon matrix is formed. The catalyst shows the most excellent activity and selectivity, the removal rate of 4-NP reaches 100% within 6 min, and high catalytic activity can be achieved.

The invention discloses a RuIr-Gd2O3 bimetallic catalyst, a preparation method thereof and application of the RuIr-Gd2O3 bimetallic catalyst in a reaction for preparing synthesis gas by catalyzing N2O methane oxide dry reforming. The RuIr-Gd2O3 bimetallic catalyst is prepared from a Gd2O3 carrier and a RuIr bimetallic nano-alloy loaded on the Gd2O3 carrier, and the RuIr-Gd2O3 bimetallic catalyst is prepared from the RuIr-Gd2O3 bimetallic nano-alloy. The preparation method comprises the following steps: mixing the Gd2O3 carrier with a solution containing a Ru precursor and an Ir precursor, carrying out a stirring reaction under ultraviolet irradiation, evaporating the solvent to dryness, drying, and roasting in a reducing atmosphere to obtain the RuIr-Gd2O3 bimetallic catalyst. According to the method, efficient activation of N2O, precise cracking of CH4 and selective oxidation of an intermediate are realized through oxygen species slow release, redox center separation and bimetal site coordination strategies, so that the catalyst has high conversion rate and high CO / H2 yield at low temperature, and shows huge potential of cooperatively utilizing greenhouse gases under mild conditions.

A hydrogen evolution electrode preparation method based on a three-period minimal curved surface structure belongs to the technical field of new energy electrolytic hydrogen production and fluid transportation, and comprises the following steps: constructing a three-dimensional model of the required three-period minimal curved surface structure; performing image slicing processing on the three-dimensional model by using slicing software; printing a required three-period minimal curved surface structure by using a plane projection micro-stereolithography 3D printer; a nanometer ultraviolet lamp is adopted to circularly irradiate the three-period extremely-small curved surface structure; soaking in a sulfuric acid solution and carrying out ultrasonic oscillation; carrying out vacuum drying and carrying out oxygen plasma hydrophilic treatment; depositing a nickel-based compact conductive layer on the three-period minimal curved surface structure by using chemical deposition; depositing a nickel-iron alloy catalyst on the three-period minimal curved surface structure of the nickel substrate by using electro-deposition; and carrying out ultrasonic oscillation with ethanol and vacuum drying. According to the application, collaborative design of catalyst distribution and a macro-microstructure is realized, and a new way is provided for preparation of a high-performance water electrolysis hydrogen production electrode.

The application provides a screening method and device for a reforming product oil selective hydrogenation alloy catalyst, and the method comprises the following steps: obtaining reactant information, small molecule substance information which can reflect the structural characteristics of the reactant, all alloy catalyst systems to be screened, and the relationship between transition metals and hydrogen atom adsorption capacity; generating an alloy catalyst surface model for each alloy catalyst system, predicting the surface hydrogen atom coverage, combining the small molecule substance information to construct a kinetic model, and obtaining intrinsic reaction kinetic information of each alloy catalyst surface model; taking the predicted surface hydrogen atom coverage and hydrogen atom adsorption energy as input data, and taking catalytic performance as output data to construct a prediction model; obtaining the catalytic performance prediction value of each alloy catalyst surface model according to the prediction model; and screening the alloy catalyst according to the catalytic performance prediction value to obtain the reforming product oil selective hydrogenation alloy catalyst. The method can realize rapid screening of the catalyst.

The application relates to a preparation method of a nanoporous NiBi alloy catalyst for nitrogen reduction. The nanoporous NiBi alloy catalyst is obtained by using Al, Ni and Bi metal particles as raw materials and by adopting a method of smelting, belt casting and dealloying. The application has the following advantages: (1) the three-dimensional nanoporous structure of the catalyst can provide abundant active sites for the catalytic reaction and is beneficial to electron transmission in the reaction process; (2) the synergistic effect of the Ni phase and the NiBi phase can effectively reduce the reaction energy barrier of the rate-determining step, inhibit the hydrogen evolution side reaction and improve the catalytic efficiency; and (3) the preparation method is simple and efficient, low in price, safe and environmentally friendly, and has a good application prospect in the field of electrocatalytic nitrogen synthesis ammonia.

The invention belongs to the technical field of nano material catalysts, and particularly relates to a metal organic framework derived carbon-supported high-entropy alloy catalyst for carbon dioxide hydrogenation and a preparation method thereof. The preparation method comprises the following steps: dissolving zirconium salt, an amino-functionalized organic ligand and a regulator in a solvent to react to form an MOF precursor; the MOF precursor and a salt template agent are subjected to heat treatment in an inert atmosphere, then the template agent is removed, purification is performed, and a nitrogen-doped carbon carrier is obtained; a transition metal compound and a noble metal compound are loaded on a nitrogen-doped carbon carrier through an impregnation method, and then reduction and alloying treatment are performed by adopting a pulse Joule thermal method to prepare the catalyst. A Co, Ni, Cu, Pt and Pd five-element metal system adopted in the catalyst forms an efficient synergistic catalytic center, and a CH4 synthesis path with high activity and high selectivity is guided together; a pulse Joule thermal method is used for reduction activation, so that the catalyst has excellent carbon deposition resistance and long-term operation stability.

The invention belongs to the technical field of electrocatalytic nitrate reduction synthesis of ammonia, and particularly relates to a preparation method of a cobalt-iron alloy catalyst, which at least comprises the following steps: 1, preparing a cobalt-iron oxide precursor by adopting an epoxide gel method; and 2, mixing the cobalt-iron oxide precursor powder obtained in the step 1 with an alcohol solvent, water and a Nafion solution, carrying out ultrasonic treatment to prepare ink, spraying the ink on a current collector, and then carrying out electroreduction on a loaded cathode material with a constant current in an electrolyte protected by argon to generate the cobalt-iron alloy catalyst. Compared with the prior art, the CoxFey alloy catalyst with a lattice expansion effect and an adjustable electronic structure is prepared by combining an alloying strategy with an in-situ electrochemical reduction method, so that the problem of adsorption-activation imbalance of an intermediate of a Co-based catalyst in a low-concentration NO3 <-> environment is relieved, and the practical process of electro-catalysis NO3 <-> RR for low-concentration NO3 <-> wastewater treatment is accelerated.

The application discloses a preparation method of a transition metal alloy catalyst, which comprises the following steps: S1, mixing a solution A containing 2,5-dihydroxyterephthalic acid with a solution B containing a transition metal salt and zinc acetate, and performing a hydrothermal reaction to obtain a precursor; the transition metal is at least one selected from nickel, iron, cobalt, copper, manganese, magnesium, zirconium, chromium, molybdenum and cadmium; S2, oxidizing and calcining and reducing and calcining the precursor obtained in the step S1 to obtain the transition metal alloy catalyst. The transition metal alloy is used as an active component, has high activity and high selectivity, can exhibit excellent catalytic performance in the preparation of an aldehyde group hydrogenation reaction, and has very important industrial value.