53 results about "Molybdenum dioxide" patented technology

The present invention relates to a process for producing molybdenum dioxide dichloride, which is a very efficient process that does not use hazardous chlorine gas and high reaction temperatures and enables the production of molybdenum dioxide dichloride in high yield without solvent.

The present invention provides a method for preparing molybdenum dioxide dichloride based on a molybdenum-containing solution. The technical scheme comprises the following steps: adjusting the pH of the molybdenum-containing solution to 7.5-9.0 using a pH regulator to obtain a treated molybdenum-containing solution; adding a calcium source to the treated molybdenum-containing solution at a molar ratio of molybdenum to calcium source of 1:1.5-2.0, stirring, and solid-liquid separation to obtain a molybdenum-containing precipitate; mixing the molybdenum-containing precipitate with a chlorinating agent at a molar ratio of molybdenum to chlorinating agent of 1:1-4 to obtain a chlorination reaction product; placing the chlorination reaction product in a reaction apparatus, introducing a protective atmosphere, and reacting at 150-180°C for 1-3 hours to produce molybdenum dioxide dichloride gas; and condensing the molybdenum dioxide dichloride gas at 0-50°C to obtain molybdenum dioxide dichloride based on the molybdenum-containing solution. This method features a simple process, environmental friendliness, high safety, and low energy consumption. The prepared molybdenum dioxide dichloride based on the molybdenum-containing solution is of high purity.

Methods for preparing catalysts for oxidative dehydrogenation (ODH) of alkanes such as ethane are provided. An exemplary method includes forming a slurry including metal oxides; one or more of a bismuth compound, an antimony compound, and a tellurium compound; a reducing agent; and water; and heating the slurry to form the catalyst. The metal oxides include an oxide of molybdenum and an oxide of vanadium. The bismuth compound includes bismuth oxide, bismuth hydroxide, or a bismuth carbonate. The antimony compound includes an oxide of antimony, an antimony acetate, or an antimony ethoxide. The tellurium compound includes tellurium dioxide. The reducing agent includes molybdenum dioxide and may further include vanadium dioxide. The methods use all inorganic reagents, with no build up COx pressure observed during the hydrothermal synthesis.

The present invention provides a novel method for preparing molybdenum dioxide dichloride, belonging to the technical field of molybdenum dioxide dichloride. The method uses molybdenum trichloride, activated carbon, and chlorine as reaction raw materials. The molybdenum trichloride and activated carbon are mixed in a certain proportion, placed in a tubular reactor, heated to a certain temperature, and then an excess of dry chlorine is introduced to react to produce molybdenum dioxide dichloride gas. This gas is collected in a cooling chamber to obtain molybdenum dioxide dichloride solid. The crude product is then sublimated and purified to ultimately obtain a high-purity molybdenum dioxide dichloride product. This method has a high yield, improves raw material utilization and product yield, reduces production costs, and is conducive to industrial production.

The application discloses a method for removing organic pollutants by using molybdenum dioxide to promote activated periodate, and comprises the following steps: adding molybdenum dioxide, ferric salt and periodate into wastewater containing organic pollutants, and then performing catalytic degradation reaction to remove the organic pollutants in the wastewater. In the method, molybdenum dioxide is introduced into the homogeneous ferric / periodate system, and serves as an electron donor and mediator of a Fenton-like reaction. The molybdenum dioxide can not only accelerate the Fe 3+ / Fe 2+ cycle rate and promote the activation of the periodate, but also promote the generation of high-valence iron (Fe(IV)) in the system, form a non-radical pathway dominated oxidation mechanism, promote the degradation reaction to be more rapid and intense, and finally realize the efficient degradation of the organic pollutants. The method has the advantages of rapid degradation rate, good reusability, simple process, convenient operation and environmental friendliness, and can be widely used in the treatment of organic pollutant wastewater.

The invention relates to a graphene-coated molybdenum dioxide nanorod composite material as well as a preparation method and application thereof. The composite material is of a core-shell structure and takes a molybdenum dioxide nanorod as a core and a graphene layer as a shell; the graphene layer is formed by high-temperature carbonization of polyaniline, and the thickness of the graphene layer is 10-80 nm. The preparation method comprises the following steps: dissolving a molybdenum source in a nitric acid aqueous solution for hydrothermal reaction to prepare a molybdenum trioxide nanorod precursor; dispersing the molybdenum trioxide nanorod precursor in an acidic solution, sequentially adding aniline and ammonium persulfate under a stirring condition, and reacting to obtain a polyaniline / molybdenum trioxide composite precursor; and drying the composite precursor, and carrying out high-temperature calcination to obtain the graphene-coated molybdenum dioxide nanorod composite material. Compared with the prior art, the composite material has the high conductivity of graphene and the chemical activity of molybdenum dioxide, and shows excellent removal efficiency and cycling stability on lead ions in the capacitive deionization process.

The present invention relates to the technical field of metal additive manufacturing, and discloses a method for preparing molybdenum-rhenium alloy powder suitable for 3D printing. The method specifically comprises the following steps: step 1, weighing raw materials ammonium rhenate and molybdenum dioxide to prepare a slurry; step 2, spray drying and granulation to prepare spherical precursor granules; step 3, calcination and hydrogen reduction to prepare molybdenum-rhenium alloy intermediate powder; step 4, plasma spheroidization treatment to prepare spherical molybdenum-rhenium alloy powder. The present invention performs hydrogen reduction on the spray-dried precursor granules and can achieve a sintering effect. The intermediate powder after reduction retains the spherical morphology of the precursor and improves the cohesive strength. At the same time, the interior of the particles maintains a loose and porous structure, and can achieve stable powder feeding and improve heat energy absorption efficiency in a plasma torch environment. In actual production applications, it can effectively reduce energy consumption, improve spheroidization efficiency and sphericity.

The application provides a method and application for reducing molybdenum trioxide to generate molybdenum dioxide or molybdenum carbide, which comprises the following steps: dispersing MoO3 powder in a mixed solution of monohydric alcohol and polyhydric alcohol, adding a triblock copolymer P123 stabilizer, and obtaining a suspension which is subjected to microwave-assisted solvothermal reaction, centrifugation or filtration and washing, and then brown H 0.93 The MoO3 / C precursor microspheres are placed in an argon plasma environment and calcined at a high temperature of 500-600 DEG C for 30-60 min to obtain brown-black MoO2 / C microspheres; or the H 0.93 The MoO3 / C precursor is placed in a hydrogen-argon plasma environment and calcined at a high temperature of 500-600 DEG C for 30-60 min to obtain gray Mo2C / C microspheres. The MoO2 / C and Mo2C / C materials prepared by the application have nanocrystalline characteristics and excellent electrochemical performance, and have a good commercial application prospect as negative electrode materials of lithium batteries.

This invention discloses a method for preparing a nano-zinc sulfide composite material, comprising: (1) dissolving ammonium molybdate in deionized water, stirring evenly to form a 50 g / L solution, then sequentially adding zinc acetate and thiourea, wherein the mass ratio of ammonium molybdate to zinc acetate and thiourea is 2:1, and stirring thoroughly to obtain a mixed solution; (2) transferring the obtained mixed solution to a reaction vessel, reacting at a constant temperature of 160℃ for 12 h, and obtaining a solid powder after treatment; (3) heat-treating at 300-400℃ for 2 h to obtain the nano-zinc sulfide composite material. This invention synthesizes zinc sulfide nanomaterials with different sizes and morphologies, while molybdenum dioxide nanoparticles modify the surface of zinc sulfide. The two work synergistically to have heterogeneous structural characteristics that promote and accelerate electron transport. Using them as electrode materials for electrochemical detection of nicotine and the metabolite cotinine content in cigarettes shows potential application advantages.

The invention relates to a method for purifying high-purity molybdenum dioxide dichloride, which comprises the following steps: S1, adding a raw material molybdenum dioxide dichloride into sublimation equipment under the protection of inert gas or nitrogen, arranging a filter screen and a small pore plate between a sublimation end and a receiving end, and vacuumizing the sublimation equipment; s2, raising the temperature of the sublimation equipment to 150-170 DEG C, the temperature of a high-boiling-point region to 120-140 DEG C, the temperature of a product region to 100-120 DEG C and the temperature of a low-boiling-point region to 80-100 DEG C, and collecting a product molybdenum dioxide dichloride in the product region; and S3, sampling the high-purity molybdenum dichloride collected in the step S2, and repeating the operation for sublimation for multiple times to finally obtain a high-purity molybdenum dichloride product. According to the method, the content of inorganic metal elements such as aluminum, iron and titanium in the dichloromolybdenum dioxide is remarkably reduced, and small-particle-size powder particles are prepared and serve as a molybdenum-containing film precursor, so that the production requirement is met.

This invention discloses a method for extracting molybdenum from molybdenum oxide raw materials, comprising: mixing the molybdenum oxide raw materials with a certain proportion of leaching agent for leaching to obtain a first leaching solution for later use; removing impurities from the first leaching solution through resin or extractant to obtain a molybdenum-containing purified solution; adding a control agent to the molybdenum-containing purified solution to obtain a precursor solution; and placing the precursor solution in an autoclave for heating and decomposition to obtain the final product. The process of this invention can prepare molybdenum dioxide products in a short time, with simple steps and low economic cost, and avoids the introduction of ammonia nitrogen reagents throughout the process, thus preventing the generation of ammonia nitrogen waste pollutants. The molybdenum leaching rate during the leaching process and the molybdenum precipitation rate during the product preparation process of this invention exceed 99.5%.

The application belongs to the technical field of bulletproof ceramic preparation, and provides a boron carbide bulletproof ceramic material and a preparation method thereof; first, molybdenum trioxide is subjected to reduction treatment in a hydrogen atmosphere to prepare reduced molybdenum dioxide; second, boron carbide, the reduced molybdenum dioxide and an additive in a specific proportion are mixed with a solvent, uniformly mixed through a ball milling process, and then subjected to vacuum drying and sieving treatment to prepare a uniform mixed powder; the mixed powder is subjected to unidirectional pressure cold pressing preforming, and the green body is further improved in density through cold isostatic pressing; the green body is subjected to gradient temperature sintering, sequentially experiences a reduction activation stage and a densification stage, realizes a high densification structure of the ceramic material, and finally, the sintered body is subjected to hot isostatic pressing treatment, further optimizes the internal structure of the material, improves the density and mechanical properties, and is suitable for the field of bulletproof materials.

The embodiment of the present application relates to a kind of molybdenum disulfide coated lithium lanthanum zirconium oxygen composite solid electrolyte material and its preparation method.The preparation method includes: ammonium tetrathiomolybdate is dissolved in pure water and dissolved, to obtain ammonium tetrathiomolybdate solution;Lithium lanthanum zirconium oxygen solid electrolyte is added to ammonium tetrathiomolybdate solution, and slurry is prepared by ultrasonic dispersion and stirring;The slurry is spray dried into dry powder;The powder is heat treated in the atmosphere of hydrogen mixed protective gas, to obtain molybdenum dioxide coated lithium lanthanum zirconium oxygen composite solid electrolyte material.

The invention discloses a Ni-doped ferroferric oxide-molybdenum dioxide composite nano material, a preparation method thereof and application of the Ni-doped ferroferric oxide-molybdenum dioxide composite nano material as a hydrogen and oxygen evolution electrocatalyst. According to the invention, the Ni-doped ferroferric oxide-molybdenum dioxide composite nano material is successfully prepared through a diversified material preparation process combining hydrothermal synthesis, high-temperature calcination and electro-deposition. The catalyst is a non-noble metal-based composite material, has the advantages of low raw material cost and green and controllable preparation process, and solves the industrial problems of high price and scarce resources of traditional noble metal catalysts (such as Pt and RuO2).

The invention provides a composite negative electrode material and a preparation method and application thereof.The composite negative electrode material comprises carbon nanofibers and a heterojunction composite material wrapped in the carbon nanofibers, and the heterojunction composite material comprises first metal and molybdenum dioxide, the work function of the first metal is greater than that of the molybdenum dioxide. The ion conduction rate of the battery can be improved, and the cycle performance is improved.

The application discloses a platinum-nickel loaded molybdenum carbide / molybdenum dioxide nanocomposite material, a preparation method and application. The application first uses a metal molybdenum salt and a complexing agent as raw materials to prepare a Mo2C / MoO2 base material containing a heterojunction, then loads PtNi on the Mo2C / MoO2 base material to prepare the platinum-nickel loaded molybdenum carbide / molybdenum dioxide nanocomposite material. The MoO2 / Mo2C nanomaterial carrier well anchors the PtNi alloy, further improves the catalytic stability of the material, and the electronic coupling and interface synergistic effect provided by the heterojunction can enhance the reactivity of the active sites, so as to maximize the catalytic performance of the material, and further reduce the hydrogen production application cost under an acid condition. Experimental results show that the platinum-nickel loaded molybdenum carbide / molybdenum dioxide nanocomposite material has the advantages of high catalytic activity, excellent stability and the like as a hydrogen production electrocatalyst of an acid electrolyte, and therefore has a wide application prospect.

The present application relates to the technical field of industrial solid waste resource utilization, in particular to a process for producing heavy slag sand from high-titanium slag. The process comprises the following steps: (1) adjusting the molten slag: under the condition of 1450-1500 DEG C, adding molybdenum dioxide and / or bauxite to the molten high-titanium slag, and then adding sodium carbonate and stirring to obtain the adjusted molten slag; (2) controlling the temperature and granulating: centrifuging the adjusted molten slag to form particles, and cooling the molten droplets by high-pressure air cooling to ensure that the molten droplets are cooled to 900-1100 DEG C during flight, and obtaining the granulated material; (3) activation treatment: activating the granulated material, and then dehydrating, drying and screening the activated material to obtain the heavy slag sand. The process optimizes the mineral phase composition of the slag and improves the mechanical properties of the product through the synergistic effect of molten component adjustment, temperature control granulation and hydrothermal activation, and finally prepares high-quality heavy slag sand meeting the building standards, realizing efficient resource utilization of high-titanium slag.

The application relates to the technical field of anti-radiation glass, and discloses anti-radiation glass for low-orbit spacecrafts, a preparation method and application thereof. The anti-radiation glass for low-orbit spacecrafts comprises the following raw materials in parts by mass: quartz sand 45.5-68 parts, aluminum hydroxide 8.41-10.25 parts, boric acid 8.86-24.62 parts, carbonate 24-43.69 parts, cerium dioxide 0.6-2.1 parts, gallium sesquioxide 0.2-1.2 parts, antimony sesquioxide 0.5-1 part, nitrate 2-4.6 parts, molybdenum dioxide 0.5-1.4 parts, lead oxide 0.8-2.2 parts, tetrabutyl titanate 3.4-12.75 parts, and kerosene 0.2-0.8 part. Through the technical scheme, the problem of insufficient anti-radiation performance of the glass for low-orbit spacecrafts in the related art is solved.

The present invention relates to the technical field of sodium / lithium ion battery negative electrode materials, and discloses a molybdenum-based negative electrode material, a preparation method thereof, and an application thereof. The material comprises nitrogen- and sulfur-coated carbon nanorods, wherein the carbon nanorods are filled with core-shell molybdenum-based nanoscrolls; the core-shell molybdenum-based nanoscrolls comprise a molybdenum dioxide core and a molybdenum disulfide shell with a curved structure, and the number of molybdenum disulfide layers is 12 to 35. The molybdenum-based negative electrode material provided by the present invention consists of a core-shell MoO2-MoS2 nanoscroll with a carbon nanorod coating and internal filling; the MoO2-MoS2 nanoscroll is obtained by homologous conversion of MoO3 nanorods and has a unique core-shell structural feature. The two form a large number of heterogeneous interfaces, providing abundant reaction active sites for storing sodium ions or lithium ions and accelerating the electrochemical reaction kinetics; the MoS2 shell has a curved structural feature, and the number of MoS2 layers is regulated to 12 to 35 layers by limiting the pyrolysis temperature and the amount of sulfur-containing initiator, so as to obtain excellent sodium / lithium storage performance, and has excellent rate performance and cycle stability when used in sodium / lithium batteries.

The invention relates to a method for preparing a patterned molybdenum dioxide thin film through laser induction and a flexible electronic device, and belongs to the technical field of functional material preparation and processing, precursor ink containing molybdenum trioxide nanoparticles, polyvinylpyrrolidone and isopropanol is prepared, a substrate is coated with the precursor ink to form a precursor thin film, and the patterned molybdenum dioxide thin film is prepared. And after drying and curing, carrying out laser direct writing reduction sintering on the precursor film, and reducing and sintering into molybdenum dioxide by utilizing a photothermal effect generated by surface plasmon resonance. The invention aims to overcome the dependence of a traditional process on a high-temperature vacuum environment, and provides a method for efficiently preparing a molybdenum dioxide film with high conductivity and biocompatibility in an environment atmosphere in a patterning manner, and a multifunctional flexible electronic device is constructed based on the film.

The invention discloses a thermal insulation molybdenum trioxide-molybdenum dioxide heterojunction / polyimide aerogel composite material and a preparation method thereof. A molybdenum trioxide nanobelt with a specific length-width ratio is accurately synthesized by utilizing a hydrothermal reaction; the controllable growth of the molybdenum trioxide-molybdenum dioxide heterojunction is realized through interface engineering, and a heterogeneous interface with an energy band matching characteristic is formed; then, the molybdenum trioxide-molybdenum dioxide heterojunction is compounded with polyamide acid, and the composite aerogel with a layered structure is prepared through a strong temperature gradient driven freezing assembly method and a freezing drying technology. By constructing a triple synergistic phonon scattering network of a molybdenum trioxide-molybdenum dioxide heterojunction interface, an organic-inorganic hybrid interface and a gas-solid porous interface, phonon scattering is effectively improved, and heat conductivity is reduced. The performance bottleneck of a traditional heat insulation material is broken through, and a brand new solution is provided for efficient heat management in an extreme environment.

The application belongs to the technical field of conductive ceramic materials, and particularly relates to a conductive ceramic material and a preparation method and application thereof. According to mass parts, the conductive ceramic material comprises the following components: 79-97 parts of beta-aluminum oxide, 0.5-2 parts of yttrium oxide, 0.7-3 parts of thorium oxide, 1-8 parts of zirconium oxide, 0.5-2 parts of molybdenum dioxide, 0.2-3 parts of copper oxide and 0.1-3 parts of zinc oxide. Due to the introduction of high-activity aluminum oxide nano powder and yttrium oxide, the sintering temperature can be greatly reduced, the energy consumption is reduced, the preparation cost is reduced, the competitiveness is improved, and the application is conducive to popularization.

The utility model discloses an oil-free starting swash plate compressor, belongs to the technical field of compressors, and aims to solve the problem that the swash plate compressor is easy to damage in the starting and running processes under the low-temperature condition. According to the technical scheme, a main shaft is provided with a swash plate, and the surface of the swash plate is plated with a molybdenum dioxide plating layer; one end of the main shaft is connected with a belt wheel for driving the main shaft to rotate, and the outer side of the belt wheel is detachably connected with a primary sealing piece; the main shaft is sleeved with a shaft seal rotating along with the main shaft, the circumferential inner wall of the mounting groove is provided with a containing groove for containing the shaft seal, and the containing groove is located between the swash plate bearing and the belt wheel. A sealing groove is formed in the side, close to the belt wheel, of the shaft seal, and a second-stage sealing piece is arranged in the sealing groove, so that the damage probability of the two-way swash plate compressor in the starting and running process under the low-temperature condition is reduced, the durability and reliability of the two-way swash plate compressor in the starting and running process are improved, and the influence of impurities on internal parts of the compressor is reduced; and the overall durability and reliability of the compressor in a low-temperature environment are improved.

The present application belongs to the field of catalytic material technology, and specifically relates to a molybdenum-based catalyst, its preparation method and application. The molybdenum-based catalyst provided in the present application includes a substrate, and an active component loaded on the substrate, wherein the active component includes molybdenum dioxide and at least one of a nickel element or a nickel-molybdenum alloy; or, the substrate is loaded with a reducing metal oxide and / or a reducing metal; the morphology of the active component is needle-shaped, rod-shaped or blade-shaped; the size of the active component is nanometer-scale or micrometer-scale. The molybdenum-based catalyst provided in the present application has high catalytic activity for hydrogen production by electrolysis of water, while avoiding the safety hazards caused by hydrogen leakage during the reduction treatment, which is beneficial to the industrial production and application of the catalyst.

The embodiment of the invention discloses a method for preparing a porous ferromolybdenum alloy through one-step hydrogen reduction. The method comprises the steps that S1, industrial molybdenum oxide and iron ore concentrate are mixed according to a set proportion, and a mixed raw material is obtained; s2, carrying out compression molding on the mixed raw material to form a cylindrical green body; s3, the cylindrical green body is heated to the pre-reduction temperature in the hydrogen atmosphere at the set pre-reduction heating speed for pre-reduction treatment, so that industrial molybdenum trioxide is reduced into molybdenum dioxide, and part of iron ore concentrate is reduced into iron oxide; and S4, the cylindrical blank obtained after pre-reduction treatment is heated to a reduction temperature from the pre-reduction temperature in a hydrogen atmosphere at the set reduction heating rate for reduction treatment, molybdenum dioxide and iron oxide are reduced into metal molybdenum and metal iron, the ferromolybdenum alloying process is achieved, and the porous low-apparent-density ferromolybdenum alloy is obtained. The porous ferro-molybdenum alloy with proper porosity is obtained by accurately controlling parameters such as the ratio of raw materials, the forming pressure, and the heating rate, the temperature, the time and the hydrogen flow in the hydrogen reduction process.

The invention provides a crystalline silicon solar cell and a preparation method thereof. The crystalline silicon solar cell comprises an N-type crystalline silicon substrate, a first passivation layer, a second passivation layer, an N-type amorphous silicon layer, a laminated structure, a first transparent conductive layer and a second transparent conductive layer. The first passivation layer and the second passivation layer are located on opposite surfaces of the N-type crystalline silicon substrate. The N-type amorphous silicon layer is located on the first passivation layer. The laminated structure is located on the second passivation layer and comprises a first molybdenum oxide layer on the second passivation layer and a second molybdenum oxide layer on the first molybdenum oxide layer. The first transparent conductive layer is located on the N-type amorphous silicon layer, and the second transparent conductive layer is located on the second molybdenum oxide layer. The first molybdenum oxide layer is doped with molybdenum and is used as a hole transport layer. And tungsten is doped in the second molybdenum oxide layer and is used for reducing the work function of molybdenum oxide, so that the work functions of the second molybdenum oxide layer and the second transparent conductive layer are matched.

The invention belongs to the technical field of metal material preparation, and discloses a preparation method and application of molybdenum lanthanum alloy molybdenum powder. According to the scheme, stable production of the 4N-grade high-purity molybdenum powder is achieved through two-time solid-solid doping, segmented hydrogen reduction and homogeneous molybdenum boat preparation processes; the method is characterized by comprising the following steps: mixing molybdenum dioxide and lanthanum oxide according to a ratio of (59-60): 1, carrying out primary reduction, carrying out secondary doping and mixing with pure molybdenum powder, carrying out secondary reduction to obtain molybdenum-lanthanum alloy molybdenum powder with the lanthanum content of 0.1-1.0%, and preparing a special molybdenum boat from the molybdenum-lanthanum alloy molybdenum powder or the pure molybdenum powder for carrying operation of a reduction furnace. Through twice solid-solid doping and segmented reduction processes, the high-temperature strength and recrystallization resistance of the molybdenum powder are improved, impurity pollution is effectively inhibited, and the purity and batch consistency of the molybdenum powder and the high-temperature service performance of a molybdenum boat are improved; and the technological process is completely autonomous and controllable without depending on imported high-temperature alloy, the raw material cost is reduced compared with a traditional process, and comprehensive economic benefits are remarkable.

The invention discloses a polystyrene composite material as well as a preparation method and application thereof, and belongs to the technical field of household appliance materials. The polystyrene composite material comprises polystyrene resin, a stick-slip inhibition component and a polar interface toughening agent, the stick-slip inhibition component comprises a component A and a component B, the component A is ultra-high molecular weight polyethylene, and the component B is selected from at least one of molybdenum dioxide, molybdenum oxide, molybdenum carbide, molybdenum disulfide, tungsten dioxide and boron nitride; the polar interface toughening agent is an acrylate copolymer containing a polar ethyl acrylate group. The material is applied to noise prevention of sliding parts of household appliances, the problem of stick-slip of the material is solved from the principle of noise generation, and friction noise does not exist in sliding parts such as refrigerator hinges and air conditioner air deflectors in the using process.

The invention belongs to the technical field of organic synthesis and photocatalysis, and relates to a semiconductor / molybdenum-based acidic composite catalyst and application thereof in preparation of dihydroquinazolinone derivatives. The composite catalyst comprises a semiconductor material and molybdenum-based acidic components loaded on the surface and in the semiconductor material, and a heterojunction structure is formed between the semiconductor material and the molybdenum-based acidic components. The semiconductor material comprises titanium dioxide, and the molybdenum-based acidic component is one or more of ammonium molybdate tetrahydrate, ammonium molybdate dehydrate, potassium molybdate, phosphomolybdic acid, silicomolybdic acid, molybdenum phosphorus heteropoly acid ammonium salt, molybdenum trioxide and molybdenum dioxide. A stable interface structure is formed in a loading mode, and the catalytic effect is synergistically enhanced by means of the interface electronic regulation and control capability of a semiconductor material while acidic active sites are maintained. The system not only significantly improves the reaction efficiency, but also has good cycle stability and recoverability, thereby providing a new technical path for green and efficient synthesis of dihydroquinazolinone compounds.

The present invention belongs to the field of two-dimensional magnetic materials, and specifically relates to a method for preparing a MoO2 non-layered two-dimensional material. MoO3 powder is heated to volatilize, and then chemically deposited on a substrate surface with hydrogen in a hydrogen-containing carrier gas to form the MoO2 non-layered two-dimensional material. The volatilization temperature of the MoO3 powder is greater than or equal to 700°C; the surface of the substrate is silicon dioxide or TMDs; and the chemical deposition temperature is 540-590°C. The present invention also includes materials prepared by the preparation method and their magnetic applications. The preparation method described in the present invention can successfully prepare MoO2 non-layered two-dimensional materials, and the materials prepared by the preparation method unexpectedly exhibit linear magnetoresistance behavior and possess superior magnetic properties.