34 results about "Ammonium heptamolybdate" patented technology

The invention belongs to the technical field of photocatalysis and environmental governance, and particularly relates to a composite photocatalyst, in particular to a graphite-phase carbon nitride / molybdenum trioxide composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, dispersing ammonium heptamolybdate in deionized water, adjusting the pH value of the solution to 0.5 + / -0.3 by using sulfuric acid, stirring and centrifuging the formed system, and carrying out vacuum drying to obtain a molybdic acid precursor; s2, mixing melamine and the molybdic acid precursor, calcining the formed mixture, and naturally cooling to room temperature after calcining is finished, so as to obtain the composite photocatalyst. Tests prove that the prepared catalyst has excellent cycling stability, still keeps high catalytic activity after being recycled for multiple times, and has a good industrial application prospect.

The invention relates to a method for producing ammonium heptamolybdate with high crystal yield and high purity by taking ammonium tetramolybdate as a raw material, which comprises the following steps: adding pure water into a batching tank at room temperature, starting a stirrer, introducing liquid ammonia into the batching tank, then adding ammonium tetramolybdate, stirring and dissolving, heating to 65 DEG C, and stirring and dissolving for 1 hour at the constant temperature of 65-70 DEG C to obtain an ammonium molybdate mixed solution; refluxing, circulating and precisely filtering by a precise filter, pumping into a cooling crystallizing tank, adding nitric acid into the crystallizing tank while stirring at room temperature to adjust the pH value of the solution to 6.2-6.5, and continuously stirring for 30 minutes; and cooling the ammonium molybdate mixed solution in the cooling crystallization tank for 7 hours, cooling the temperature of the material in the crystallization tank to 10-12 DEG C, crystallizing and separating out an ammonium heptamolybdate product, centrifugally filtering, introducing air with the relative humidity of 40% and the temperature of 15-25 DEG C into a rotary roller dryer, and drying to obtain the ammonium heptamolybdate. The method has the advantages of simple and reasonable process, regular product crystal form, good crystallization yield and high purity.

The application discloses a preparation method of a nanoscale multi-metal catalyst, which comprises the following steps: mixing ferric nitrate, magnesium nitrate, lanthanum nitrate, gadolinium nitrate, ammonium heptamolybdate and citric acid with water to obtain a concentrated solution by heating and concentrating; mixing ethylenediaminetetraacetic acid, ammonia water and urea to obtain an ethylenediaminetetraacetic acid solution; mixing the concentrated solution and the ethylenediaminetetraacetic acid solution to obtain a mixed solution by stirring, adding a surfactant into the mixed solution and calcining, and finally roasting. The ferric nitrate, the magnesium nitrate, the lanthanum nitrate and the gadolinium nitrate are mixed, a complexing agent is added, a solution is prepared by using a complexing method, the solution is concentrated, calcined and sieved, and finally the nanoscale multi-metal catalyst is formed. The catalyst prepared by the method has a uniform particle size. The catalyst prepared by the method is combined with a plasma technology to prepare a single-walled carbon nanotube, and the single-walled carbon nanotube (without treatment) has a high ratio, a large IG / ID and a small powder resistance.

The application discloses a kind of low-temperature denitration catalysts of water resistance, sulfur resistance and alkali resistance and a preparation method thereof, and belongs to the technical field of catalyst materials.The preparation method comprises the following steps: ammonium metavanadate and ammonium dihydrogen phosphate are added to monoethanolamine and a small amount of water to stir and dissolve, obtaining solution 1; cerium nitrate is added to deionized water to dissolve, obtaining solution 2; solutions 1 and 2 are mixed uniformly to obtain solution 3; ammonium metatungstate and ammonium heptamolybdate are added to deionized water to dissolve and then added to solution 3, obtaining solution 4; titanium white, zirconium nitrate and silicon dioxide powder are mixed uniformly and added to solution 4 to stir uniformly, while a certain amount of lactic acid, glass fiber and boric acid are added, obtaining uniform slurry; drying; calcination, and the process is completed.The beneficial effects are as follows: the prepared catalyst can achieve a denitration efficiency of more than 90% in a low-temperature range of 160-220°C, and the catalyst has high strength, resistance to 6% water poisoning, 3% alkali poisoning and 400ppm sulfur poisoning.

The application belongs to the technical field of atmosphere treatment, and provides a sulfur-poisoning-resistant denitration and carbon monoxide removal SCR catalyst and a preparation method thereof. Part of anatase titanium white, platinum nitrate, ammonium metatungstate and water are first mixed to perform first calcination to obtain a precursor powder; the rest of the anatase titanium white, clay, stearic acid, ammonium heptamolybdate, ammonium metavanadate, glass fiber, cerous nitrate, zirconium nitrate and water are second mixed to obtain a slurry; the slurry, the precursor powder, carboxymethyl cellulose ammonia and polyoxyethylene are mixed, and after the pH value is adjusted to be alkaline, kneading and aging are sequentially performed to obtain an aged slurry; the aged slurry is sequentially subjected to extrusion molding, drying and second calcination to obtain the SCR catalyst. The obtained SCR catalyst can efficiently remove nitrogen oxides and carbon monoxide, and also has excellent sulfur-poisoning resistance.

The application provides a molybdenum-copper composite coiled material for a heat sink and a preparation method thereof, and relates to the technical field of molybdenum-copper composite heat sink materials. The method adopts ammonium heptamolybdate for heat preservation in three temperature zones, which is beneficial to the growth of molybdenum trioxide, and generates coarse and loose molybdenum trioxide; the coarse and loose molybdenum trioxide is reduced to obtain very fine molybdenum powder; the ultra-fine molybdenum powder is mixed with a copper-containing solution to obtain a solid-liquid mixture, and then the solid-liquid mixture is reduced in hydrogen to obtain uniform molybdenum-copper powder, so that the material organization is more uniform; and the ultra-fine molybdenum powder is easier to sinter due to the larger surface activity, and can be sintered to be dense at a lower sintering temperature; the application also adopts polyformaldehyde, polyethylene, styrene-butadiene-styrene and other high molecular organic substances as binders, so that the obtained heat sink material has better fluidity when being pressed into a shape, is easy to be removed in the debinding stage, and almost has no residue, and can obtain molybdenum-copper heat sink material with better size precision and better density.

The invention discloses a preparation method of an iron-molybdenum hydrogenation catalyst for coke-oven gas hydrogenation fine desulfurization, and particularly relates to the technical field of preparation of a catalyst for coal chemical gas purification. The invention aims to solve the core problem that the service life of the existing catalyst is only 3-5 months due to micropore blockage caused by tar carbonization in coal gas. The catalyst takes basic oxide modified gamma-Al2O3 as a carrier (neutralizing the strong acidity of traditional aluminum oxide and inhibiting tar adsorption), active components are precursor ferric nitrate, precursor ammonium heptamolybdate and an anti-carbon deposition component (CeO2 or ZrO2), and tartaric acid of which the dispersity is superior to that of citric acid is adopted as a competitive adsorption aid; in the preparation process, the beta acid site strength is reduced through segmented roasting at the high temperature of 600-700 DEG C, and carbon deposition generation sites are reduced; accurate prevulcanization is adopted, so that the structural stability of the catalyst is further optimized. The organic sulfur conversion rate of the catalyst is greater than or equal to 97.5%, the continuous operation life is prolonged to 12-18 months, the catalyst can be efficiently used for pretreatment of raw material gases such as preparation of methanol from coke-oven gas, synthesis ammonia and the like, and deep removal of organic sulfur and long-acting operation of the catalyst are realized.

The application belongs to the technical field of electrochemical bifunctional overall water splitting catalyst materials, and particularly relates to a bifunctional boron-doped molybdenum-cobalt microsphere overall water splitting catalyst as well as a preparation method and application thereof. ‑2 The application is prepared by dissolving ammonium heptamolybdate and cobalt acetate tetrahydrate in water in a small amount of sulfuric acid and sodium citrate borate system according to a certain molar ratio, heating to a transparent liquid at a constant temperature, taking foamed nickel as a working electrode, taking a platinum sheet and an Ag / AgCl electrode as a counter electrode and a reference electrode, and taking a current density of-300 to-200 mA cm ‑2 at 20-50 DEG C for 10-30 minutes, rinsing the surface of the foamed nickel with deionized water after the electrodeposition is completed, and vacuum drying to obtain a black microsphere boron-doped MoCo material loaded on the foamed nickel. The catalyst prepared by the application has the characteristics of low cost, non-toxicity, high chemical activity and stability, exhibits high hydrogen evolution and oxygen evolution activity, and low overpotential.

This invention discloses a method for preparing a catalyst for the oxidative dehydrogenation of ethane, comprising the following steps: dissolving ammonium heptamolybdate tetrahydrate, ammonium metavanadate, telluric acid, and a dispersant in deionized water to form a mixed solution; adding an aqueous solution of niobium oxalate to the mixed solution within 15–50 min to form a suspension; then adding an aqueous solution of the template agent polyether P123; and subjecting the process to aging, hydrothermal crystallization, drying, calcination, and removal of the M2 phase to obtain the catalyst for the oxidative dehydrogenation of ethane. This invention introduces a dispersant and the template agent polyether P123 at specific steps in the catalyst preparation process, combined with limiting the time of adding the niobium oxalate aqueous solution to the mixed solution, which effectively improves the pore structure and specific surface area of ​​the catalyst, increases the proportion of high-concentration active sites on its terminal surface, and thus significantly enhances the catalyst's reactivity.

The invention provides a method for preparing fine-grained ammonium heptamolybdate crystals by an aid crystallization method. The method specifically comprises the following steps: step 1, preparing an ammonium molybdate solution; 2, crystallizing an ammonium molybdate solution auxiliary agent; and step 3, performing reduced pressure evaporation to prepare fine-fraction ammonium heptamolybdate crystals. Molybdenum oxide is used as a raw material, ammonium heptamolybdate is formed under the synergistic effect of induced crystallization of assistant crystallization and reduced pressure evaporation, and the concentration of molybdenum in the solution is improved through reduced pressure evaporation, so that molybdate ions are induced to be converted towards a high polymerization degree direction, and formation of ammonium heptamolybdate is remarkably promoted; and the crystallization auxiliary agent can promote the formation of crystals and refine ammonium heptamolybdate crystal particles, so that a fine-fraction ammonium heptamolybdate crystal product with high purity and narrow particle size distribution is obtained.

The application provides a preparation method of a morphology-controllable iron-molybdenum formaldehyde catalyst, and belongs to the technical field of catalyst preparation.The preparation method of the catalyst comprises the following steps: firstly, ammonium heptamolybdate tetrahydrate and ferric nitrate nonahydrate are respectively mixed with a complexing agent to prepare a molybdenum-containing solution and an iron-containing solution; then the molybdenum-containing solution and the iron-containing solution are mixed, pH is adjusted, vacuum rotary evaporation is carried out to form a sol, and finally, the sol is dried to form a dry gel, and the dry gel is calcined to obtain a catalyst product.The Mo and Fe coordination environment in the precursor solution is regulated by the complexing agent in the application, the component distribution is prevented from being uneven, a uniform precursor solution is formed, the precipitation rate of the precursor and the particle growth process are changed by adjusting the pH of the solution, the morphology and particle size of the catalyst are influenced, and a catalyst with different morphology and excellent comprehensive performance is prepared.

The application discloses a kind of high-strength flat plate catalyst and preparation method thereof, it is related to catalyst technical field.The technical scheme is as follows: including the following mass fraction components: titanium dioxide 50-80 parts, high-viscosity kaolin 2-15 parts, glass fiber 2-10 parts, carbon fiber 2-10 parts, plasticizer 2-15 parts, ammonium heptamolybdate 0.5-2 parts, ammonium metavanadate 0.5-2 parts and water 10-30 parts.The high-viscosity kaolin is prepared, and then combined with the subsequent high-temperature coating process, the adhesion between the catalyst mud and the stainless steel screen plate is greatly improved, thereby enhancing the stability of the catalyst, prolonging the service life of the catalyst and improving the catalytic reaction efficiency.

The patent discloses a preparation method of Mo-V-Sb-Na-O composite oxide catalyst and application of the Mo-V-Sb-Na-O composite oxide catalyst in a reaction of preparing acrylic acid from propylene aldehyde, and comprises the following steps: using a solvent evaporation method to prepare a Mo-V series catalyst, dissolving ammonium heptamolybdate, ammonium metavanadate and antimony trioxide in deionized water and uniformly mixing under rapid stirring, and drying and calcining the mixed liquid to obtain a high-activity catalyst for selectively oxidizing propylene aldehyde into acrylic acid, i.e. a composite oxide catalyst. The composite oxide catalyst prepared by the above method has the advantages of simple operation process, short preparation time, good selectivity and yield of acrylic acid.

The present application relates to the technical fields of energy materials and electrocatalysis, and particularly relates to a preparation method and application of a catalyst containing bimetallic oxide and transition metal sulfide, which comprises the following steps: firstly, mixing thiocarbamide, ammonium heptamolybdate and cobalt nitrate with ionized water in sequence, and preparing a uniform mixed solution by ultrasonic; then, putting the mixed solution and a current collector into a tetrafluoroethylene lining for hydrothermal reaction; after the reaction is completed and naturally cooled, washing, vacuum drying, and then the catalyst for alkaline electrolytic water oxygen evolution reaction containing bimetallic oxide and transition metal sulfide can be obtained. The catalyst prepared by the present application exhibits good stability and catalytic property in the alkaline electrolyte, and can obtain a higher current density at a lower overpotential. Meanwhile, the preparation method of the present application is simple in operation, short in time consumption, low in production cost, easy to realize large-scale production, and has excellent application prospect in the field of electrocatalysis.

The invention belongs to the field of powder metallurgy, and particularly discloses a method for preparing nano molybdenum-rhenium alloy powder through liquid-phase in-situ precipitation. According to the method, ammonium heptamolybdate and ammonium perrhenate serve as raw materials and are dissolved in an ammonia water solvent, then a dispersing agent, a complexing agent and a surface active agent are added, the pH is adjusted to be within the acidic range, so that molybdenum-rhenium precursors are rapidly separated out from the solution in situ, and atomic-scale mixed ammonium dimolybdate-ammonium perrhenate mixed crystals are formed. And then low-temperature calcination dehydration is conducted in the argon atmosphere, gradual reduction and alloying of oxides are sequentially achieved through a three-stage hydrogen reduction technology, and finally the nanometer molybdenum-rhenium alloy powder which is uniform in component, good in dispersity and about 160 nm in average particle size is obtained. The method is simple in process, and the prepared powder is small in particle size and concentrated in distribution, has high sintering activity and is suitable for preparing a high-performance molybdenum-rhenium alloy material.

The current invention describes the synthesis of heterogeneous composite comprising laponite and heptamolybdate by wetness impregnation method. Different experimental settings were used to carry out the synthesis, including the heptamolybdate ammonium dose (1.5, 1 or 0.5 g), ion exchanger dose tetrabutyl ammonium bromide (0.5, 0.25 or 0.125g), reaction duration (12 or 24h) and calcination temperature (200, 300 and 400 °C) for 2 hours. The optimal synthesis composition of the laponite / molybdate (Lap-Mo) is as follows: 5 g of Lap + 0.5 g of TBA + 1.5 g of heptamolybdate ammonium with reaction duration of 24 h and a calcination temperature of 300 °C for 2 hours under air. The laponite / molybdate composite have been used in an AOP to degrade MB dye in presence of H2O2 as an oxidant under visible light radiation. The AOP experiment have been optimized using RSM based on BBD. Under the optimum conditions: contact time=72 min, [H2O2 / Lap-Mo] wt% ratio= 1.24, dye concentration= 20.95 mg.L-1 pH= 8.3 reaching a 99% of degradation rate. The Lap-Mo catalyst degradation efficiency was also tested for other dyes such as safranin T (ST) and rhodamine B (RhB) as cationic dyes and methyl orange (MO) as anionic dye. Indeed, they exhibits a highly degradation rate equal to 96, 90 and 89% for ST, RhB and MO, respectively. Advantageously, the invention intends to promote, profitably, and efficiently dye degradation using the laponite / molybdate composite. Furthermore, the potential of the invention falls within the framework of improving wastewater treatment and paves the way to more areas of application in multiple industries.

The invention provides a method for preparing ammonium dimolybdate from ammonium heptamolybdate, and belongs to the technical field of chemical product preparation. The method comprises the following steps: weighing ammonium heptamolybdate and an ammonium source in a container according to a molar ratio, adding deionized water, stirring while heating until solids are completely dissolved, then cooling and crystallizing the solution, filtering after the crystallization is finished, and drying the filtered crystal substance to obtain ammonium dimolybdate; the ammonium source is one or more of ammonium bicarbonate, ammonium carbonate and ammonia water, and the molar ratio of the ammonium heptamolybdate to the ammonium source is equal to 1: (1.0-1.3) in terms of total ammonium in the ammonium heptamolybdate and the ammonium source. The method is short in technological process, low in energy consumption and relatively simple in preparation means, and the prepared ammonium dimolybdate product is low in impurity content and stable in quality.

The invention relates to a self-supporting lanthanum-molybdenum-cobalt-boron difunctional complete water splitting catalyst as well as a preparation method and application thereof, and belongs to the technical field of electro-catalytic materials. The method comprises the following steps: dissolving lanthanum salt, ammonium heptamolybdate and cobalt acetate tetrahydrate in an aqueous solution containing boric acid and sodium citrate according to a set molar ratio, adding a small amount of sulfuric acid, and heating to form a uniform electrolyte; and by taking the foamed nickel as a working electrode, carrying out electro-deposition for 100-200 minutes at the current density of-300 to-200mA cm <-2 > and the temperature of 20-50 DEG C to obtain the lanthanum-molybdenum-cobalt-boron material loaded on the foamed nickel. The catalyst has a self-supporting structure, does not need a binder, is simple in preparation process, low in cost and environment-friendly, shows high catalytic activity and excellent stability in both hydrogen evolution reaction and oxygen evolution reaction, and is suitable for an efficient all-water decomposition system.

The application provides a low-temperature sulfur-resistant denitration catalyst and a preparation method thereof, and the preparation method comprises the following steps: adding titanium dioxide into deionized water under stirring to obtain a base slurry; dissolving ammonium metavanadate in dilute sulfuric acid to react to generate vanadyl sulfate, adjusting the pH value to 2-4, and then standing and aging to obtain a vanadium precursor solution; dissolving ammonium heptamolybdate in deionized water, adding dilute sulfuric acid to adjust the pH value to 2-4, and then obtaining a molybdenum precursor solution; first adding the molybdenum precursor solution into the base slurry, mixing uniformly, then adding the vanadium precursor solution, continuing to stir, then adding an additive, stirring uniformly, and controlling the pH value of the slurry in the mixing process to be in the range of 2-4 to obtain a mixed slurry; and performing spray drying and calcination on the mixed slurry, and obtaining the low-temperature sulfur-resistant denitration catalyst after cooling. The catalyst prepared in the application has the characteristics of high dispersion of active components, high low-temperature denitration efficiency, excellent sulfur resistance and the like under the conditions of low temperature and high-sulfur flue gas.

This invention discloses the preparation and application of a hydrogen overflow-based yolk-shell structured hydrodesulfurization catalyst. The preparation method includes (1) adding nickel nitrate hexahydrate to glycerol, isopropanol, and deionized water, and performing a solvothermal reaction on the green solution to obtain a solid spherical nickel composite precursor. (2) mixing the nickel composite precursor with an ethanol solution of thioacetamide, and adding an aqueous solution of ammonium heptamolybdate to obtain a suspension. The suspension is then subjected to a solvothermal reaction to obtain the yolk-shell structured catalyst. This application employs a confined sulfidation coupled in-situ intercalation strategy to controllably derive a yolk-shell structured catalyst with abundant NiMoS phase. Under the action of confined sulfidation, organic molecules can be intercalated in situ and assist in the construction of a stable 1T-MoS2 with short plate length and low stacking, thereby promoting the full exposure of the "rim" site. This catalyst uses the core NiS2 as an auxiliary active phase to initiate a hydrogen overflow effect, and promotes the synergy of the two active phases through the yolk-shell structure, thereby achieving ultra-deep desulfurization of oil products.

The present application relates to the field of catalysts, in particular to a kind of based on extrusion type direct writing 3D printing monolithic SCR denitration catalyst and its preparation method, the method will titanium dioxide, binder, reinforcing agent and pore-forming agent be mixed uniformly, then ammonium metavanadate, ammonium heptamolybdate, niobium oxalate, cerium nitrate, zirconium nitrate, peptizing agent and deionized water are mixed and stirred, continue to stir after adding auxiliary agent, two are mixed, adjust rheological property, make it form printable slurry with shear thinning characteristics and yield stress, after defoaming, using extrusion type direct writing 3D printing layer-by-layer deposition forming, and calcining, obtain the catalyst.The present application can directly construct three-dimensional interconnected pore network structure without special mould, the mechanical strength of the obtained catalyst reaches 82~97N / cm, the bulk density is 0.7~0.89g / cm 3 Outlet NO concentration ≤10ppm under 180℃~450℃, high space velocity, with good catalytic performance, thermal stability and anti-poisoning capacity.

The invention discloses a method suitable for improving the abrasive resistance of a flat plate type catalyst, and belongs to the technical field of denitration catalysts. The method comprises the following steps: (a) optionally selecting 1-3 of a pre-hydrolyzed silane coupling agent solution, a silica sol solution and a titanium sol solution as binders, and mixing the binders with nano TiO2, montmorillonite, glass fibers, ammonium heptamolybdate, ammonium metavanadate and auxiliary materials to prepare pug; the main components are composed of nano TiO2, a binder added in the binder solution, montmorillonite, glass fibers, ammonium heptamolybdate, ammonium metavanadate and auxiliary materials; the pug consists of a main component and water, and the main component accounts for 65-75% of the total mass of the pug; and (b) coating, drying, curling, assembling and calcining the pug to obtain the flat plate type catalyst. The flat plate type catalyst has excellent wear resistance, meanwhile, introduction of the silane coupling agent, the silica sol or the titanium sol does not inhibit denitration performance of the catalyst, and the flat plate type catalyst can be widely applied to working conditions with high requirements for wear resistance.

A method for preparing a flat plate type denitration catalyst by using waste wind power blade glass fibers comprises the following steps: cutting waste wind power blades into small blocks, then carrying out microwave high-temperature pyrolysis, and cutting the glass fibers from the pyrolyzed product by a cutting machine to form a glass fiber raw material A; adding the glass fiber raw material A into an acid solution containing sodium dodecyl benzene sulfonate, and carrying out acid modification treatment to obtain a raw material B; adding the raw material B into a nitrate solution of rare earth metal for dipping treatment to obtain a modified glass fiber raw material C; adding TiO2 into deionized water, an ammonium metavanadate solution, an ammonium heptamolybdate solution, the modified glass fiber raw material C, a binder and a forming aid, and kneading to form a paste material; and coating the prepared paste on a stainless steel mesh through a roller, and drying and calcining to obtain the flat plate type denitration catalyst. According to the method provided by the invention, the flat plate type denitration catalyst with high denitration efficiency can be prepared while a large number of waste wind turbine blades are consumed.

The invention relates to the technical field of efficient catalysts and prevention and control of atmospheric pollutants, in particular to a wide-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: adding deionized water and a dispersing agent into a reaction kettle, stirring after heating, then simultaneously injecting a salt solution and a precipitator solution into the reaction kettle, continuously stirring and mixing the solutions after charging, and filtering, washing and drying after aging to obtain precursor powder; calcining the precursor powder in an N2 atmosphere to obtain calcined powder; and putting the calcined powder into a mixed aqueous solution of ammonium metavanadate and ammonium heptamolybdate, carrying out water bath stirring reaction, drying, and calcining to obtain the wide-temperature denitration catalyst. The wide-temperature characteristics of low-temperature efficient denitration and high-temperature stable denitration of the catalyst are achieved through active component dispersion, layered structure regulation and control and high-temperature and low-temperature active site collaborative construction, and the catalyst effectively adapts to the working condition characteristic that the temperature of industrial flue gas fluctuates greatly.

The invention belongs to the technical field of glass pigments, and particularly relates to a boron-promoted sintering low-expansion black pigment and a preparation method and application thereof.The black pigment is prepared from, by weight, 1-6 parts of boron compound, 2-12 parts of metal oxide, 0-2 parts of lithium carbonate, 0-5 parts of ammonium heptamolybdate, 10-25 parts of manganese dioxide, 12-35 parts of copper oxide and 45-55 parts of chromic oxide. The preparation method comprises the following steps: weighing the raw materials according to certain parts by weight, transferring the raw materials into a mixer, and uniformly mixing the raw materials; and transferring the mixture into a muffle furnace for calcining treatment, cooling, ball-milling and crushing, and sieving. The black pigment provided by the invention is uniform in particle, the minimum thermal expansion coefficient can reach 68.8 * 10 <-7 > / DEG C, and the black pigment can be applied to household appliances, automobiles and photovoltaic glass, especially high borosilicate and microcrystalline glass.

The application discloses a Mo-Ru double-site transition metal catalyst and a preparation method thereof, and belongs to the technical field of electrocatalytic materials. The method uses graphene oxide as a carrier, adds a mixed solution of ruthenium trichloride trihydrate and ammonium heptamolybdate tetrahydrate into a graphene oxide dispersion solution, and performs ultrasonic treatment for 6 hours to obtain a uniform precursor solution; then, a hydrothermal reaction is performed to obtain a solid product; after the product is freeze-dried for 12 hours, a chemical vapor deposition method is used to perform high-temperature nitridation on the product at 800 DEG C under an ammonia-argon mixed atmosphere for 2 hours, and finally, the Mo-Ru double-site transition metal catalyst is prepared. The catalyst exhibits excellent two-electron hydrogen evolution reaction electrocatalytic activity and long-term stability in acidic and alkaline media, and can be efficiently applied to the field of hydrogen production by water electrolysis.

The present invention relates to the technical field of catalysts. Disclosed are a high-strength flat-plate catalyst and a preparation method therefor. The technical solution thereof is the catalyst comprising the following components in parts by mass: 50-80 parts of titanium dioxide, 2-15 parts of high-viscosity kaolin, 2-10 parts of glass fibers, 2-10 parts of carbon fibers, 2-15 parts of a plasticizer, 0.5-2 parts of ammonium heptamolybdate, 0.5-2 parts of ammonium metavanadate, and 10-30 parts of water. In the present invention, the high-viscosity kaolin is prepared, and in combination with the subsequent high-temperature coating process, the adhesive force between a catalyst slurry and a stainless steel screen plate is greatly improved, thereby enhancing the stability of the catalyst, prolonging the service life of the catalyst, and improving the reaction efficiency of the catalytic.

The application discloses a kind of porous carbon nanosheet supported bimetallic phosphide catalyst and preparation method thereof, the catalyst includes porous carbon nanosheet and the molybdenum phosphide / tungsten phosphide nano heterojunction supported thereon.Preparation method includes: ammonium heptamolybdate, ammonium metatungstate is made Mo / W precursor solution, mixed with porous carbon nanosheet / melamine dispersion, stirring, ultrasonic, join phosphorus source to make catalyst precursor powder, calcination, obtain porous carbon nanosheet supported bimetallic phosphide catalyst.The catalyst of the application has the advantages of strong catalytic activity, good stability, etc., when used for removing organic sulfur compounds in oil, it can realize effective degradation of organic sulfur compounds under the condition of less dosage, and can realize ultra-deep oxidation desulfurization, high use value and good application prospect.The preparation method of the application has the advantages of simple process, easy operation, low cost, green and pollution-free, etc., and can realize large-scale production, which is beneficial to industrial application.

The invention discloses a molybdenum trioxide nanotube material capable of inducing piezoelectric response and application of the molybdenum trioxide nanotube material in catalytic degradation, and belongs to the technical field of catalytic materials, pollutant degradation and environmental protection. The molybdenum trioxide nanotube material has a three-dimensional structure, is obtained by reacting ammonium heptamolybdate with hydrochloric acid and modifying the surface of the molybdenum trioxide nanotube material through polyvinylpyrrolidone, and has a wide bandgap semiconductor photocatalytic characteristic, and under the action of illumination, crystal lattices in the material are remarkably distorted, positive and negative charge centers are shifted, so that the photocatalytic performance of the molybdenum trioxide nanotube material is improved. Therefore, piezoelectric response is induced. After inducing piezoelectric response, the material continuously shows excellent catalytic degradation performance, and dye and antibiotic pollutants in water can be effectively adsorbed and degraded through light pressure synergistic catalysis. In a methylene blue / tetracycline mixed pollutant system, the material can achieve the mineralization rate of nearly 90%. The material disclosed by the invention has excellent environmental pollution control capability, and particularly has a wide application prospect in the fields of water pollution control and environmental protection.

The invention relates to a molybdenum catalyst and a preparation method and application thereof. The method comprises the following steps: by taking ammonium heptamolybdate as a molybdenum source, trithiocyanuric acid as a sulfur source and activated carbon as a carrier, dispersing by ball milling, and calcining and loading in a nitrogen atmosphere to obtain the catalyst with molybdenum disulfide loaded on the activated carbon. The catalyst can be recovered through centrifugation and filtration and has excellent cycle stability. According to the method, a dexlansoprazole by-product (a mixture mainly containing levolansoprazole) is taken as a substrate, under the action of a molybdenum catalyst, hydrogen is introduced as a reducing agent, and the by-product can be reduced into the lansoprazole thioether (a synthetic precursor of dexlansoprazole) in a high-selectivity manner. In addition, racemic lansoprazole can be directly used as a substrate, high-selectivity reduction into lansoprazole thioether (a dexlansoprazole synthesis precursor) can be realized under the action of the same molybdenum catalyst, and the raw material application range of the process is further widened. The method solves the industrial problem that byproducts cannot be efficiently recycled in the existing dexlansoprazole synthesis process, has the advantages of simple reaction process, easiness in product separation and catalyst recyclability, and has a good industrial application prospect.