23 results about "Molybdenum carbide" patented technology

The application provides a molybdenum-based monolithic catalyst, a preparation method and application thereof, and the preparation method comprises the following steps: S1, providing an electrically conductive carbon carrier and pretreating; S2, mixing a molybdenum-based precursor and a high-molecular alcohol substance in water to form a stable impregnation liquid system; S3, placing the pretreated electrically conductive carbon carrier into the impregnation liquid system, ultrasonic impregnating, and then drying to obtain a catalyst precursor; and S4, calcining the catalyst precursor under an inert gas to obtain the molybdenum-based monolithic catalyst. The application adopts a modified impregnation liquid to replace a traditional modified carrier strategy, improves the wettability of the impregnation liquid to the hydrophobic electrically conductive carbon carrier, and ensures the uniform distribution of the molybdenum-based active component on the electrically conductive carbon carrier. In addition, a core-shell high-activity catalytic structure of MoO2 core-molybdenum carbide shell is constructed, which can synergistically significantly improve the catalytic activity and stability.

The application provides a method for preparing molybdenum carbide / carbon composite nanospheres based on electrostatic spinning technology, which comprises the following steps: adding ammonium molybdate into dimethylformamide, stirring for 2 hours, then adding polyacrylonitrile, and stirring for 6 hours to obtain a spinning solution; loading the spinning solution into a 10 mL syringe for electrostatic spinning to obtain precursor nanospheres Mo@PAN, and placing the precursor nanospheres in a tube furnace for heat treatment to obtain molybdenum carbide / carbon composite nanospheres. The application also provides applications in the fields of electrocatalytic hydrogen evolution, energy storage and coating materials. The molybdenum carbide / carbon composite nanospheres prepared by the method have uniform size distribution and good dispersibility. The spherical structure has good mechanical properties, and can ensure the structural stability of the material in the application process, preventing the microstructure of the material from being damaged. Meanwhile, the nanoscale spherical morphology provides a high specific surface area, which provides more active sites for the material in the applications of catalysis and energy storage, and is beneficial to improving the performance of the material.

Disclosed is a catalyst for hydrogen evolution reaction or hydrogen oxidation reaction, which is a catalyst that can be used under alkaline conditions and has significantly improved kinetic characteristics compared to existing commercial platinum catalysts. The present invention provides a catalyst for electrochemical hydrogen reaction under alkaline conditions and a method for preparing the same, and a ruthenium-based catalytic electrode containing the same, which can be used as an electrode for anion exchange membrane-based water electrolysis cell and fuel cell, wherein the catalyst has 2 to 20 ruthenium supported in an aggregate form on the surface of a molybdenum carbide-carbon nanocomposite carrier.

The application belongs to the field of environmental functional materials and water treatment technology, and specifically discloses a composite material for simultaneously removing antibiotics and hexavalent chromium in water based on a selenium iron / carbon molybdenum heterostructure, and a preparation method and application thereof. The composite material comprises composite selenium iron nanoparticles and carbon molybdenum, and a heterojunction interface is formed between the selenium iron nanoparticles and the carbon molybdenum. The selenium iron / carbon molybdenum catalyst constructed by the heterojunction engineering utilizes the enhanced active metal circulation reaction and a large number of in-situ generated interface defects to synergistically improve the intrinsic electron transfer capability, constructs a high-efficiency redox reaction interface platform, and efficiently activates the persulfate oxidant, so as to realize the simultaneous and rapid removal of antibiotics and heavy metals in water.

To provide brake discs that are highly resistant to corrosion and wear, less prone to delamination and interlayer break-up, and ensure thermal and mechanical performance, thereby demonstrating long-term reliability. [Solution] The brake band is made of gray cast iron or steel, and the disc has a base layer that covers at least one of the two braking surfaces of the brake band. The base layer consists of a titanium and / or titanium alloy matrix containing one carbide and defines the tribologically active surface of the disc. Alternatively, the base layer consists of a layer of titanium and / or titanium alloy, and the coating layer on top of it consists of a layer based on one or more carbides and defines the tribologically active surface of the disc. The one or more carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, and silicon carbide. An intermediate fusion layer exists at the interface between the base layer and the gray cast iron or steel brake band. The base layer has a crystalline structure, and its growth direction is mainly perpendicular to the braking surface.

A nanocomposite sorbent which contains molybdenum carbide, molybdenum nitride, and molybdenum oxide. The nanocomposite sorbent is in the form of nanosheets having a mean size of 10 to 100 μm and a mean thickness of 10 to 1000 nm. A method of forming the nanocomposite sorbent is also provided. The nanocomposite sorbent is used to form a membrane filter with a fluorinated polymer. The nanocomposite sorbent and membrane filter are each used in a method of removing an organic pollutant from water.

This invention relates to the field of cemented carbide materials technology, specifically disclosing a high-strength cemented carbide material and its preparation method, comprising the following raw materials in parts by weight: 5-8 parts cobalt powder, 86-90 parts tungsten carbide powder, 2.4-2.8 parts reinforcing components, and 0.5-0.7 parts modifiers. The preparation method of the high-strength cemented carbide material includes the following steps: step S1, preparation of premix; step S2, spray granulation; step S3, compaction; and step S4, spark plasma sintering. This invention incorporates reinforcing components and modifiers. The reinforcing components contain aluminum dihydrogen phosphate, silica sol, cerium oxide, zirconium oxide, tantalum carbide, molybdenum carbide, and titanium dioxide gel, which not only possess excellent physical properties themselves but also form hydrogen bonds with the modifiers, synergistically improving the overall performance of the cemented carbide material.

This invention discloses a fullerene-based (Mo2C-WC) / C 60 An electrocatalyst, its preparation method, and its application are disclosed. The electrocatalyst is composed of molybdenum oxide, tungsten oxide, and fullerene. The molar ratio of molybdenum atoms to tungsten atoms is (0.5~2):1, and the ratio of the sum of the molar numbers of molybdenum and tungsten atoms to the molar number of carbon atoms in the fullerene is 1:20. The preparation method includes the following steps: mixing fullerene, molybdenum oxide, and tungsten oxide to prepare a mixed precursor; calcining the mixed precursor at high temperature under an argon atmosphere to obtain a (molybdenum carbide-tungsten carbide) / fullerene carbon material; acid washing the (molybdenum carbide-tungsten carbide) / fullerene carbon material to remove the metal elements generated in the reaction; and finally drying to obtain a fullerene-based (Mo2C-WC) / C material. 60 Electrocatalyst. The electrocatalyst of this invention forms a unique W-Mo heterojunction with a large specific surface area and electrochemical active area, which exposes more active sites, thereby greatly enhancing the catalyst's ability to electrocatalyze hydrogen evolution.

Disclosed is a method for preparing cellulose and lignin oil by depolymerizing lignocellulose without exogenous hydrogen, including: performing reaction on the lignocellulose dispersed into an aqueous medium at 120° C. to 180° C. under the action of a catalyst; and separating a reaction product to obtain the cellulose and the lignin oil. The catalyst includes a carrier and an active ingredient loaded on the carrier, where the active ingredient is selected from one of platinum, palladium, ruthenium and nickel; the carrier is selected from one of a metal oxide, a metal composite material, silicon dioxide, nitrogen-doped carbon, molybdenum carbide and molybdenum nitride; and the metal oxide is selected from one of niobium oxide, tantalum oxide, tungsten oxide, zirconium oxide, aluminum oxide, titanium dioxide and molybdenum oxide.

The invention relates to a disc for a disc brake, the disc comprising a braking band equipped with opposite braking surfaces, the braking band being made of grey cast iron or steel, the disc comprising a base layer covering at least one of the two braking surfaces of the braking band. The base layer comprises a titanium matrix and / or a titanium alloy containing one or more carbides and defines the tribologically active surface of the disc; alternatively, the base layer comprises a layer of titanium and / or a titanium alloy, and the base layer is in turn covered by a coating layer which comprises a layer based on one or more carbides and defines the tribologically active surface of the disc. The one or more carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, silicon carbide. An intermediate fusion layer with mixed composition between the base layer and the braking band of grey cast iron or steel is provided at the junction between the base layer and the braking band, the base layer having a crystal structure with a growth direction mainly orthogonal to the braking surface.

The application belongs to the technical field of analysis and detection, discloses a high-stability molybdenum carbide conversion agent, a preparation method thereof and application in NO2 monitoring, and aims to solve the problems of high reaction temperature, easy deactivation, easy ammonia gas interference and high cost of the existing conversion agent. The molybdenum carbide conversion agent takes pretreated activated carbon as a carrier, and loads active component Mo2C and auxiliary active component transition metal oxide; wherein the loading amount of Mo element is 5%-30%, the loading amount of transition metal is 0.01-1%, and the transition metal is at least one of Co, Cu and Ni; the molybdenum carbide conversion agent has mesopores of 2-50 nm. The prepared molybdenum furnace conversion agent can efficiently convert NO2 into NO under the condition of not higher than 250 DEG C, the NO concentration is measured by a flue gas analyzer to inversely calculate the NO2 concentration, the conversion rate is high, the measurement is sensitive, accurate and good in repeatability.

This invention discloses a multi-component composite cemented carbide and its preparation method, relating to the field of alloy technology. The method includes the following steps: alumina powder, molybdenum carbide powder, carbon powder, and 10-30% cobalt powder are premixed in the presence of multidentate ligands; subsequently, tungsten carbide powder and the remaining cobalt powder are added for primary mixing, resulting in a powder. Based on a modified SPS method, the powder is sintered: the powder is subjected to a uniaxial mechanical load of 58-62 MPa, heated to a non-equilibrium peak temperature at a heating rate of 80-120°C and held for 0.5-1 min, then cooled to the equilibrium holding temperature within 5-10 s and held for 4-6 min. After holding, the uniaxial mechanical load is unloaded, and the material is cooled to room temperature under vacuum. The non-equilibrium peak temperature is 1275-1285°C, and the equilibrium holding temperature is 1220-1230°C. The cemented carbide obtained by this method exhibits strong mechanical properties.

This invention discloses a method for reducing CO2 to CO using a carbon-based molybdenum carbide heterojunction catalyst, belonging to the field of CO2 reduction technology. The method involves adding a carbon-based molybdenum carbide heterojunction catalyst to a reactor, introducing H2 and CO2, and reducing CO2 to CO; the molybdenum carbide has a MoC-Mo2C heterojunction phase. This invention eliminates the need for adding any carbon-containing or reducing atmosphere, producing a highly active MoC-Mo2C heterojunction, thus improving the space-time conversion rate and stability of CO2 hydrogenation to CO.

This invention discloses a method for preparing a HER / HOR bifunctional electrocatalyst for electrochemical hydrogen pumps, belonging to the field of new energy materials technology. This invention designs and synthesizes a molybdenum carbide support with a porous nanoflower structure to provide anchoring for platinum-ruthenium electroloading. The catalyst can be used to improve the acidic HER / HOR performance of the platinum-ruthenium electrocatalyst. This invention investigates the effect of platinum-ruthenium content on acidic HER / HOR performance, finding that the Pt / Ru@Mo2C catalyst exhibits the best acidic HER / HOR performance and the best CO anti-poisoning effect when the platinum-ruthenium content ratio is 1:1. System structural characterization and electrochemical hydrogen evolution and hydrogen oxidation performance tests show that the Pt / Ru@Mo2C catalyst achieves acidic HER performance at 10 mA cm⁻¹. ‑2 At the specified current density, its overpotential is 13 mV; the acidic HOR performance achieves a current density of 3.02 mA cm⁻¹ at 50 mV. ‑2 The electrocatalytic performance of the HER / HOR catalyst is comparable to that of the 20 wt.% Pt / C catalyst, while its CO anti-poisoning effect is far superior. This work provides a new approach for developing efficient and stable acidic HER / HOR bifunctional catalysts, and promotes the development of proton exchange membrane water electrolysis, hydrogen fuel cells, and electrochemical hydrogen pump technologies.

This invention belongs to the field of water electrolysis for hydrogen production technology, and proposes an infrasonic vibration pretreatment method for molybdenum carbide catalysts used in water electrolysis for hydrogen production. Micron-sized molybdenum carbide powder is fixed in a clamping device, and infrasonic energy is transferred to the particles through a probe to achieve nano-sizing and the formation of a crystalline-amorphous core / shell structure. By controlling the vibration power, frequency, and time, the surface active sites and specific surface area can be significantly increased, thereby improving the electrocatalytic hydrogen evolution performance. This method is mild, simple, requires no high temperature or complex precursors, avoids pollution and high energy consumption, has low raw material costs, and is controllable. The treated molybdenum carbide exhibits high performance at 10 mA·cm⁻¹. ‑2 The hydrogen evolution overpotential is significantly reduced at lower current densities, exhibiting high activity and stability, providing a scalable preparation method for hydrogen production via water electrolysis and methane reforming. This invention was supported by the Liaoning Binhai Laboratory Science and Technology Project (Project No.: LBLF-202306).

This invention belongs to the field of high-pressure jet cutting nozzle manufacturing technology, specifically relating to a cemented carbide for jet abrasive nozzles and its preparation method. The cemented carbide for jet abrasive nozzles includes a cemented carbide matrix and a boride coating. The composition of the cemented carbide matrix is: 1wt%~3wt% cobalt, 3wt%~12wt% molybdenum carbide, 3wt%~10wt% tantalum carbide, 1wt%~3wt% chromium carbide, with the balance being tungsten carbide and unavoidable impurities. The average grain size of the tungsten carbide is 0.2~0.6μm. This invention prepares a high-strength and tough cemented carbide matrix by using a low-cobalt ultrafine-grained cemented carbide with a specific composition and a gas pressure sintering process. Then, a TiB2 superhard coating with a strong (001) texture is deposited on its surface by a controllable chemical vapor deposition technology, achieving a unity of ultra-high coating hardness and extremely high interfacial bonding force, and finally obtaining a jet abrasive nozzle composite material with excellent wear resistance, long service life, and stable performance.

This invention belongs to the field of water electrolysis for hydrogen production technology, and proposes an infrasonic vibration pretreatment method for molybdenum carbide catalysts used in water electrolysis for hydrogen production. Micron-sized molybdenum carbide powder is fixed in a clamping device, and infrasonic energy is transferred to the particles through a probe to achieve nano-sizing and the formation of a crystalline-amorphous core / shell structure. By controlling the vibration power, frequency, and time, the surface active sites and specific surface area can be significantly increased, thereby improving the electrocatalytic hydrogen evolution performance. This method is mild, simple, requires no high temperature or complex precursors, avoids pollution and high energy consumption, has low raw material costs, and is controllable. The treated molybdenum carbide exhibits high performance at 10 mA·cm⁻¹. ‑2 The hydrogen evolution overpotential is significantly reduced at lower current densities, exhibiting high activity and stability, providing a scalable preparation method for hydrogen production via water electrolysis and methane reforming. This invention was supported by the Liaoning Binhai Laboratory Science and Technology Project (Project No.: LBLF-202306).

This invention discloses an application and equipment for hydrogen production via water electrolysis using a sheet-like molybdenum carbide catalyst, relating to the field of chemical technology. The equipment includes an electrolyzer with two electrode plates inserted inside. Each electrode plate has several diamond-shaped protrusions evenly distributed on its surface. The two electrode plates are positioned opposite each other as a cathode and anode. Multiple layers of mesh are arranged inside the electrolyzer near the two electrode plates. Through these structural optimizations, the current distribution and ion conduction paths are optimized, significantly improving the overall reaction efficiency and energy conversion rate for hydrogen production via electrolysis. This reduces the stress on the electrolyzer end plates and sealing structure, enhances the structural stability, sealing reliability, and durability of the equipment under long-term high-pressure operation, reduces maintenance requirements, significantly shortens equipment downtime for maintenance, lowers operating costs, and simultaneously ensures precision and airtightness after each assembly.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a Ni-doped molybdenum carbide / lithium oxalate composite lithium replenisher. The invention first obtains a Ni molecular catalyst through a liquid-phase reaction of triethanolamine and nickel chloride in ethanol, followed by calcination with Mo₂C to form a composite Ni-doped molybdenum carbide catalyst. Then, using an anti-solvent crystallization method, the lithium replenisher solution is dropwise into an organic solvent containing the catalyst, stirred, and then vacuum dried. The lithium replenisher particles adhere to the catalyst surface and / or pores, forming the composite lithium replenisher. This composite lithium replenisher, by combining lithium oxalate with the Ni-doped molybdenum carbide catalyst, utilizes the highly active catalytic sites, excellent electronic conductivity, and synergistic catalytic effect of Ni-doped molybdenum carbide to reduce the decomposition voltage of lithium oxalate, improve its conductivity and decomposition rate, thereby significantly improving the battery's initial efficiency, capacity, and cycle performance. Furthermore, the preparation process is simple, highly compatible, and has good commercial application prospects.

The application discloses a kind of molybdenum carbide@PMMA coaxial nanotube coated lithium ion battery separator, the separator includes base film and adheres in the coating layer of base film one side or two sides membrane surface, wherein the base film is polyolefin film, the coating layer slurry is prepared according to following method, first, 0.7%~1.2% dispersing agent, 18%~38% molybdenum carbide@PMMA coaxial nanotube are premixed in ultrapure water according to mass ratio;2%~10% thickening agent, 1%~8% binder, 0.1%~0.5% wetting agent and 0.05%~0.25% defoaming agent are added respectively and stirred uniformly, finally, iron is removed by filtration, and molybdenum carbide@PMMA coaxial nanotube coating layer slurry is obtained;Then using micro-gravure roll coating process, coating slurry is uniformly roll coated on polyolefin separator by coating machine, after 70 DEG C oven baking, it is rewound for standby, i.e. molybdenum carbide@PMMA coaxial nanotube coated lithium ion battery separators are obtained.The separator prepared by the application has excellent heat shrinkage performance, pole piece bonding performance and electrolyte wetting performance, and also has high mechanical strength.

This invention discloses a method for preparing a cobalt / molybdenum carbide self-supporting electrocatalyst for hydrogen production through water electrolysis and its application. The method for preparing the cobalt / molybdenum carbide self-supporting electrocatalyst for hydrogen production through water electrolysis provided by this invention includes the following steps: mixing a precursor containing cobalt and molybdenum with nickel foam, and performing a hydrothermal reaction to obtain nickel foam with a supported precursor; then, treating the nickel foam with the supported precursor at low temperature followed by high-temperature carbonization to obtain a Co / Mo2C catalyst supported on nickel foam. This invention prepares a catalyst with high performance, good stability, and low overpotential driving at industrial-grade current density for hydrogen production through water electrolysis using specific processes and conditions; moreover, the preparation process does not involve CH4 / H2 reducing gases, making it safer and more stable.

The application discloses a kind of carbon-supported molybdenum carbide flower balls containing ruthenium single atom and its preparation method and application, the preparation method uses noble metal ruthenium compound and carbon-supported transition metal carbide as precursor, by water bath immersion method for coordination substitution, then using high-temperature reduction obtains noble metal single atom doped polymer nanometer flower ball catalyst composite material.The strong interaction between the catalyst metal and the support makes the noble metal surface energy low, the active site increases, the electrocatalytic activity is improved, and it can show high activity and stability in acidic and alkaline electrolyte.In comparison with prior art, the method is simple and safe, easy to scale production, and the carbon nanometer flower ball loaded ruthenium single atom doped molybdenum carbide material has the advantages of maximum atomic utilization efficiency, unique electronic structure, good conductivity, high catalytic activity and the like.

To provide a brake disc for disc brakes that is resistant to corrosion and wear, and at the same time less prone to delamination and interlayer delamination. [Solution] The brake band is made of gray cast iron or steel, and the disc includes a bonding layer. The base layer consists of a titanium or titanium alloy matrix containing one or more carbides and defines the tribologically active surface of the disc. The coating layer, consisting of layers of titanium or titanium alloy, consists of layers based on one or more carbides and forms the tribologically active surface of the disc. The carbides are selected from the group consisting of titanium carbide, tungsten carbide, chromium carbide, niobium carbide, molybdenum carbide, and silicon carbide. The bonding layer consists of a titanium layer or a titanium or steel alloy layer. A first intermediate fusion layer exists at the interface between the bonding layer and the gray cast iron or steel brake band, and a second intermediate fusion layer exists at the interface between the base layer and the bonding layer. The base layer and the bonding layer have a crystalline structure, and their growth directions are approximately perpendicular to the brake surface.