77 results about "Ammonium heptamolybdate" patented technology

The invention relates to the technical field of molybdenum metallurgy, and particularly discloses a crystal preparation method of ammonium heptamolybdate, which comprises the following steps: taking low-grade molybdenite, crushing, ball-milling, and calcining to obtain molybdenum calcine. And dispersing the molybdenum calcine with a sodium hydroxide solution, and filtering to obtain a leaching solution. And then adding a compound chelating agent into the leachate, carrying out adsorption and desorption treatment to obtain a sodium molybdate solution, then adjusting the pH value, carrying out ammonia leaching, and then carrying out cooling crystallization to obtain ammonium heptamolybdate. By adopting the prepared compound chelating agent, the purity of ammonium heptamolybdate prepared by taking low-grade molybdenite as a raw material can be improved, and after desorption treatment, separated precipitates can be used as the compound chelating agent again for adsorbing molybdate radicals, so that the aim of cyclic utilization is achieved.

The invention provides a preparation method of a shape-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, respectively mixing ammonium heptamolybdate tetrahydrate, ferric nitrate nonahydrate and a complexing agent, and dissolving in water to prepare a molybdenum-containing solution and an iron-containing solution; then mixing the molybdenum-containing solution and the iron-containing solution, adjusting the pH value, carrying out vacuum rotary evaporation to form sol, finally drying the sol to form xerogel, and roasting the xerogel to obtain a catalyst finished product. The coordination environment of Mo and Fe in the precursor solution is regulated and controlled through the complexing agent, uneven distribution of components is prevented, the uniform precursor solution is formed, the morphology and particle size of the catalyst are influenced by adjusting the pH of the solution and changing the precipitation rate of the precursor and the growth process of particles, and the catalyst with different morphologies and excellent comprehensive performance is prepared.

The present invention provides a method, application and product for preparing diglyceride with weight loss effect by enzymolysis, which belongs to the field of enzyme engineering technology. The method comprises the following steps: S1, mixing lipase, ammonium heptamolybdate tetrahydrate with water, adding glycerol precipitation, filtering, and obtaining an enzyme preparation; S2, mixing plant raw material oil, glycerol, fatty acid, sodium fatty acid with the enzyme preparation obtained in step S1, reacting under inert gas conditions, and obtaining an enzymolysate; S3, molecularly distilling the enzymolysate obtained in step S2 to obtain diglyceride; wherein the lipase is a mixture of Rhizomucor miehei lipase and Candida antarctica Aspergillus niger lipase. The present invention uses ammonium heptamolybdate tetrahydrate to load a specific lipase mixture, and at the same time optimizes the component types and ratios of the raw materials in the enzymolysis process, effectively improving the mass percentage content and diglyceride yield of enzymolysis production of diglyceride.

The invention discloses a preparation method of an ethane oxidative dehydrogenation supported catalyst. The catalyst is formed by supporting a transition metal oxide on the surface of an M1 catalyst, the preparation method of the M1 catalyst comprises the following steps: dissolving ammonium heptamolybdate tetrahydrate, ammonium metavanadate, telluric acid and a dispersing agent in deionized water to form a mixed solution; and adding an aqueous solution of niobium oxalate into the mixed solution within 15-50 minutes to form a suspension, aging, carrying out hydrothermal crystallization, drying, roasting, and removing the M2 phase to obtain the M1 catalyst. The pore structure and the specific surface area of the molybdenum-vanadium-tellurium-niobium catalyst can be improved by adding a dispersing agent in the preparation process of the M1 catalyst and limiting the time for adding an aqueous solution of niobium oxalate into a mixed solution, and through mutual cooperation of all steps and parameters, the pore structure and the specific surface area of the molybdenum-vanadium-tellurium-niobium catalyst can be improved; and then the transition metal oxide is loaded on the surface of the M1 catalyst for phase interface coupling, and the transition metal oxide and the M1 catalyst cooperate with each other, so that the catalytic performance of the loaded catalyst can be remarkably improved.

The invention discloses a preparation method and application of a composite hydrogen evolution catalyst for in-situ growth of MoS2 on a Ti3C2Tx ultrathin nanosheet, relates to a preparation method and application of a hydrogen evolution catalyst, and aims to solve the technical problems of low utilization rate of active sites and low catalytic efficiency of the conventional MoS2 catalyst. The method comprises the following steps: etching titanium aluminum carbide to obtain Ti < 3 > C < 2 > F < x > powder; stripping the powder or performing alkali heat treatment, vulcanization or hydro-thermal treatment after stripping to prepare an ultrathin nanosheet; the ultrathin nanosheets and a mixed solution of ammonium heptamolybdate tetrahydrate and thiourea are subjected to a hydrothermal reaction, separation, washing and drying are carried out, the composite hydrogen evolution catalyst MoS2 / Ti3C2Tx is obtained, and T is F, S, O or OH. When the composite material is used for producing hydrogen by electrolyzing water, the current density of 10mA. Cm <-2 > can be realized only by virtue of 86-97mV overpotential in alkaline electrolyte, and the composite material is used in the field of producing hydrogen by electrolyzing alkaline water.

The invention discloses a preparation method of a denitration catalyst Ce-Sb-Mo / TiO2 with a wide temperature window and high water resistance, and belongs to the technical field of catalyst materials.The preparation method comprises the following steps that cerium nitrate hexahydrate, antimony trichloride and ammonium heptamolybdate tetrahydrate are added into deionized water to be subjected to ultrasonic dissolution and then stirred, titanium dioxide powder is added, magnetic stirring is conducted at the room temperature, and a mixture is obtained; obtaining a solution; dropwise adding NH3.H2O into the obtained solution to adjust the pH value to be 10, continuously stirring, then separating the solid from the liquid, washing the solid with deionized water to be neutral, drying and calcining to obtain the product. Cerium, antimony and molybdenum are loaded on a titanium dioxide carrier by utilizing a precipitation method, and after the titanium dioxide carrier is treated, a test result shows that both antimony and molybdenum are successfully introduced to the surface of the catalyst. The obtained cerium-based catalyst is wide in temperature window, high in water resistance and sulfur resistance, high in oxidation-reduction capacity and high in surface acidity, and the vanadium-tungsten catalyst is wide in temperature window.

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 discloses preparation and application of a yolk-shell structure body phase hydrodesulfurization catalyst based on hydrogen overflow, and the preparation method comprises the following steps: (1) adding nickel nitrate hexahydrate into an aqueous solution of glycerol, isopropanol and deionized water, and carrying out solvothermal reaction on a 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 ammonium heptamolybdate aqueous solution to obtain a turbid liquid; and performing solvothermal reaction on the turbid liquid to obtain the yolk-shell structure catalyst. The yolk-shell structure catalyst with rich NiMoS phases is controllably derived by adopting a limited range vulcanization coupling in-situ intercalation strategy. Under the action of confinement vulcanization, organic molecules are intercalated in situ and assist in constructing stable 1T-MoS2 with short plate length and low stacking, so that full exposure of rim sites is promoted. According to the catalyst, an inner core NiS2 is used as an auxiliary active phase to trigger a hydrogen overflow effect, and cooperation of double active phases is promoted through an egg yolk-shell structure, so that ultra-deep desulfurization of an oil product is realized.

The present invention provides a preparation method and application of a sulfur-containing molybdenum phosphide catalyst for the hydrogenation of medium- and low-temperature coal tar. The method uses ammonium heptamolybdate as a molybdenum source, diammonium hydrogen phosphate as a phosphorus source, and silicon-surface-modified alumina as a carrier. After equal volume impregnation and drying and calcination, the catalyst is first sulfurized and then hydrogenated in a fixed-bed reactor to reduce the severity of the activation process of the molybdenum phosphide and simultaneously form a sulfur-doped molybdenum phosphide active structure to obtain a sulfur-containing molybdenum phosphide catalyst. Medium- and low-temperature coal tar is then directly introduced into the original fixed-bed reactor to carry out a medium- and low-temperature coal tar full-fraction hydrogenation refining reaction. The preparation of the sulfur-containing molybdenum phosphide catalyst and the in-situ activation in the reactor of the present invention can be completed completely within the preparation and reaction system of the existing transition metal sulfide catalyst, greatly reducing the difficulty of preparing and using the phosphating catalyst. Moreover, the sulfur-containing molybdenum phosphide catalyst prepared by the present invention can be used completely based on the existing hydrogenation system and exhibits good hydrogenation activity.

The invention belongs to the field of biological medicine, and particularly relates to a preparation method of an antibody, which comprises the step of adding cobalt chloride, ammonium heptamolybdate, nickel chloride and ammonium metavanadate into a cell culture for producing the antibody.

The invention relates to the technical field of preparation of ammonium heptamolybdate, in particular to a preparation method of ammonium heptamolybdate. According to the method, dissolution of molybdenum in the molybdenum concentrate is accelerated by using the efficient catalyst, so that the recovery rate of molybdenum is increased. The preparation method of the ammonium heptamolybdate comprises the following specific steps: firstly, crushing molybdenum concentrate, oxidizing low-valence molybdenum in the molybdenum concentrate into high-valence molybdenum by hydrogen peroxide under the catalytic action of a catalyst, dissolving out the high-valence molybdenum, and then carrying out ammonia leaching and impurity removal; and finally evaporating, concentrating, cooling and crystallizing. The catalyst used in the preparation process of ammonium heptamolybdate is a carbon-nitrogen doped metal oxide nano material, has a large specific surface area, is rich in oxygen vacancies, has high catalytic activity, and is beneficial to rapid oxidation and dissolution of molybdenum. In addition, a large amount of acid liquor and ammonia water are not used in the preparation process of the ammonium heptamolybdate, so that the pollution is reduced.

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 invention discloses a preparation method of a catalyst for oxidative dehydrogenation reaction of ethane, which comprises the following steps: dissolving ammonium heptamolybdate tetrahydrate, ammonium metavanadate, telluric acid and a dispersing agent in deionized water to form a mixed solution; and adding a niobium oxalate aqueous solution into the mixed solution within 15-50 minutes to form a suspension, then adding an aqueous solution of a template agent polyether P123, aging, carrying out a hydrothermal crystallization reaction, drying, roasting, and removing an M2 phase to obtain the catalyst for the oxidative dehydrogenation reaction of ethane. The dispersing agent and the template polyether P123 are introduced in the specific steps of the catalyst preparation process, and the time for adding the niobium oxalate aqueous solution into the mixed solution is limited, so that the pore structure and the specific surface area of the catalyst can be effectively improved, the proportion of high-concentration active sites on the tail end surface of the catalyst is increased, and the reaction performance of the catalyst is greatly improved.

The invention belongs to the technical field of battery materials, and discloses a Cr-modified Co2Mo3N coating material for the first time. The preparation method comprises the following steps: heating and stirring a mixed aqueous solution of cobalt nitrate and ammonium heptamolybdate, and adjusting the pH value to 5-6; carrying out solid-liquid separation to obtain purple blue precipitate, namely Co2Mo3N; the method comprises the following steps: adding Co2Mo3N into a chromic nitrate aqueous solution, stirring, and carrying out solid-liquid separation to obtain the Cr-modified Co2Mo3N. Secondly, the invention discloses a coated modified positive electrode material, a preparation method thereof and a lithium ion battery. The coating material provided by the invention can effectively inhibit structural degradation and intergranular cracks in the cycle process of the positive electrode material, and after the coated and modified positive electrode material is applied to the lithium ion battery, the cycle performance and storage performance of the battery under 4.3 V voltage can be remarkably improved.

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 present invention discloses a low-temperature denitration catalyst and a preparation method thereof. The catalyst comprises the following raw materials by weight: 60-70 parts of nano titanium dioxide, 0.5-2.5 parts of zirconium oxide, 0.5-3 parts of modified graphene, 0.02-0.1 parts of chloroiridic acid, 5-8 parts of ammonium heptamolybdate, 0.5-2.5 parts of ammonium metavanadate, 2-10 parts of cerium nitrate, 3-8 parts of polypropylene fiber, 1-4 parts of ultrafine activated carbon, 2-6 parts of aluminum sol, 1.5-5 parts of polyethylene oxide, and 1.2-3.5 parts of aminocellulose. The denitration catalyst prepared by the present invention has the characteristics of large specific surface area, high porosity, high low-temperature catalytic activity, strong anti-poisoning ability, high strength, etc., and is particularly suitable for use in the low temperature range of 100-180°C, and has broad application prospects.

The invention relates to the technical field of preparation of ammonium heptamolybdate, and particularly discloses a preparation method of ammonium heptamolybdate. The invention relates to an ammonium heptamolybdate preparation method, which comprises: preparing an ammonium tetramolybdate solution with a specific gravity of more than or equal to 1.5, and crystallizing to obtain an unstable ammonium heptamolybdate crystal; and placing the unstable ammonium heptamolybdate crystal in a closed environment with the humidity of more than 95%, heating to 95-105 DEG C, keeping the temperature, and performing crystal reforming to obtain the ammonium heptamolybdate. The prepared ammonium heptamolybdate has the advantages that the ammonium heptamolybdate is almost insoluble in water in a short time, and is long-acting and high in activity.

The invention discloses a plant nutrient solution which comprises a component A and a component B. The component A comprises potassium nitrate, calcium nitrate tetrahydrate, borax, EDTA zinc and urea. The component B comprises monopotassium phosphate, potassium sulfate, ammonium dihydrogen phosphate, magnesium sulfate, DTPA iron, EDTA manganese, copper sulfate and ammonium heptamolybdate; each 10 L of the plant nutrient solution comprises the following components by mass: 1.8 kg of potassium nitrate, 4.9 kg of calcium nitrate tetrahydrate, 0.121 kg of borax, 0.021 kg of EDTA zinc, and 0.2 kg of urea. The component B comprises 0.86 kg of monopotassium phosphate, 0.3 kg of potassium sulfate, 0.15 kg of ammonium dihydrogen phosphate, 2 kg of magnesium sulfate, 0.21 kg of DTPA iron, 0.103 kg of EDTA manganese, 0.002 kg of copper sulfate and 0.017 kg of ammonium heptamolybdate; according to the invention, chemical reagents with high-concentration ratio are accurately proportioned, the proportioning balance of the reagents can be ensured in the preparation process, and meanwhile, trace elements such as molybdenum and boron are added, so that the endogenous hormone regulation and metabolism alleviation of plants in the growth process of the plants can be improved, and the growth of the plants is facilitated.

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 present invention relates to a water-resistant, sulfur-resistant, and poison-resistant ultra-low temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. The mixture of copper nitrate, nickel nitrate, and chromium nitrate in the catalyst synergizes with rubidium nitrate, and after mixing, extrusion, and roasting, a highly active catalytic center is formed, which can effectively promote NO at low temperatures. x The reduction reaction improves the low-temperature activity of the catalyst; the ZSM‑5 molecular sieve and titanium dioxide in the catalyst carrier have excellent selectivity and hydrophobicity, which can effectively prevent SO2, SO3, water molecules, etc. from occupying and destroying the active sites of the catalyst. The addition of silane coupling agent KH550 further enhances the sulfur and water resistance of the carrier, so that the catalyst can still maintain a high catalytic activity in a sulfur-containing and water-containing flue gas environment; the auxiliary agent ammonium heptamolybdate in the catalyst helps to improve the catalyst's anti-poisoning ability.

The present invention relates to a polyacid-based cobalt-containing magnetic compound, the molecular formula of which is [Co(C 20 H 14 N4)2]2(Mo8O 26 )·Solv, during preparation, ammonium heptamolybdate is dissolved in distilled water, the pH of the solution is adjusted and then placed at the bottom of a test tube; a mixed solution of distilled water and acetonitrile is added as a transition layer, and the upper layer is a solution in which cobalt chloride and 4'-(4-pyridyl)-2,2':6',2"-terpyridine are dissolved; the solution is allowed to stand and slowly diffuse to obtain red block crystals, thereby obtaining a polyacid-based cobalt-containing magnetic compound; the pH value of the ammonium heptamolybdate solution is adjusted to 4.1, and the volume ratio of distilled water and acetonitrile in the transition layer is 1:1; the polyacid-based cobalt-containing magnetic compound of the present invention is synthesized by a layered diffusion method, using a molybdate solution as a lower layer, a magnetic center cobalt ion and an organic ligand as an upper layer, and then using a mixed solvent as an intermediate layer to obtain a compound to obtain a single crystal sample.

The invention relates to the technical field of catalyst preparation, and particularly discloses a preparation method of a nano-catalyst for p-nitrophenol reduction reaction, and the preparation method specifically comprises the following steps: S1, preparation of MoS2: S101, adding 1 mmol of ammonium heptamolybdate and 30 mmol of thiourea into 40 mL of deionized water, and magnetically stirring for 30 minutes; s102, pouring the stirred transparent solution into a stainless steel polytetrafluoroethylene lined autoclave, and heating at 200 DEG C for 12 hours; s103, centrifuging the obtained sample, washing with pure water and ethanol, and drying at 80 DEG C for 8 hours to obtain MoS2; s2, preparation of CoMoS2: S201, adding 1 mmol of a mixture containing ammonium heptamolybdate and cobalt chloride hexahydrate and 30 mmol of thiourea into 40 mL of deionized water, and carrying out magnetic stirring for 30 minutes; in the invention, the synthesized Au / CoMoS2 catalyst shows excellent catalytic activity, and the reaction treatment time is short.

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.

The invention provides a cathode material, a proton ceramic reactor, preparation and application in ammonia synthesis, and the cathode material and the proton ceramic reactor are prepared by the following steps: dissolving raw materials in distilled water under heating and stirring conditions to form a solution; the raw materials comprise strontium nitrate, ferrous nitrate nonahydrate, ammonium heptamolybdate tetrahydrate, ruthenium nitrosyl nitrate, citric acid and glycine; then adjusting the pH value of the solution to 7 + / -0.5 to promote the formation of a complex, and maintaining a heating and stirring state to gradually evaporate water to obtain a gel; and drying and calcining to obtain the cathode material Sr2Fe1. 5Mo0.5-xRuxO6-delta, x is more than 0 and less than 0.1, and delta is the oxygen vacancy content. When the cathode material is applied to a proton ceramic reactor, the catalytic activity of the cathode of the reactor can be remarkably improved, and efficient nitrogen reduction reaction ammonia synthesis under the medium-temperature condition suitable for industrial application is realized.

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 is suitable for the technical field of organic liquid dehydrogenation, and provides a preparation method and application of an organic liquid dehydrogenation catalyst based on carrier modification, and the method comprises the following steps: taking a certain mass of alumina carrier, adding an acid solution, and soaking at a certain temperature; roasting the soaked carrier; the preparation method comprises the following steps: preparing a carrier, roasting, soaking in an ammonium heptamolybdate solution with a certain concentration after roasting, draining, drying and roasting after soaking, heating under ammonia gas flow, preparing an impregnation liquid, adding the impregnation liquid into the carrier, stirring in the adding process, and standing for aging after stirring; drying the catalyst after aging; and roasting the catalyst after drying. According to the method, an acid pickling surface treatment means is adopted, active sites of an alumina carrier are adjusted through acid pickling, alkaline impurities are removed, the specific surface area is increased to optimize the surface structure of the carrier and enhance dispersion of active components on the carrier, and then molybdenum nitride is added as an auxiliary agent to improve the overall dehydrogenation activity of the catalyst.

The invention discloses a nickel-molybdenum high-dispersity coal tar slurry bed hydrogenation catalyst and a preparation method thereof. The nickel-molybdenum catalyst with high dispersibility, high coke inhibition performance and high hydrogenation activity is synthesized from the composite acid, ammonium heptamolybdate, thiourea and nickel sulfate through a two-step method. The preparation method comprises the following steps: (1) preparing a composite acid solution according to the mass ratio of concentrated acid A to concentrated acid B under the condition of cold bath, and preparing a dilute acid solution with the pH value of 1-4 by adopting the composite acid solution and deionized water; and (2) adding ammonium heptamolybdate, thiourea and nickel sulfate into the dilute acid solution, reacting at room temperature for 6-15 hours, and then reacting in a hydrothermal kettle at 180-200 DEG C for 24-36 hours. And (3) after the reaction is completed, taking out the hydrothermal reaction kettle, naturally cooling to room temperature, opening the reaction kettle, taking out a black reaction product, standing and centrifuging to obtain a solid product, and drying for 1 hour at 110 DEG C under a vacuum condition to obtain the high-dispersity NiMoSx catalyst.