337 results about "Ammonium carbonate" patented technology

The invention discloses a bimetallic composite catalyst of copper and rare earth, a preparation method of the bimetallic composite catalyst and application of the bimetallic composite catalyst in electrochemical reduction of carbon dioxide. The preparation method of the bimetallic composite catalyst comprises the following steps: mixing copper salt and rare earth metal salt in water, adding ammonium carbonate and inorganic alkali into the mixture, stirring and reacting, and centrifuging, washing and drying the mixed solution to obtain a catalyst precursor; calcining the catalyst precursor to obtain the bimetallic composite catalyst, the Cu and rare earth bimetallic compound catalyst has the advantages of high current density, high selectivity, good system stability and long service life when being used for electrically reducing CO2. The catalyst has rich active sites, has a large surface area, can be fully contacted with an electrolyte and CO2, and can overcome the limitation of substance transfer. Selective output of methane or multi-carbon products is efficiently achieved by regulating and controlling the molar ratio of copper to rare earth elements, the partial current density of methane and the multi-carbon products reaches the industrialization level, and the catalytic effect is excellent.

The invention relates to the technical field of guanidine nitrate preparation, in particular to a method for preparing guanidine nitrate by a continuous dynamic tubular reaction process, which comprises the following steps: uniformly mixing dicyandiamide, target ammonium nitrate and target ammonium carbonate according to a mass ratio of 1: (1-3): (1-0.5); conveying the uniformly mixed material to a feeding section in a dynamic tubular reactor through a first conveying screw rod for mixing treatment, wherein the dynamic tubular reactor further comprises a heating section, a reaction section and a cooling section; sequentially conveying the target mixed material to a heating section for heating melting treatment, a reaction section for synthesis reaction treatment and a cooling section for cooling forming treatment through a second conveying screw rod to obtain an initial product; conveying the initial product into a cooling and crushing device for cooling and slicing to obtain a target guanidine nitrate product. According to the method disclosed by the invention, the mass and heat transfer efficiency can be improved, the online quantity and liquid holdup of the material are reduced, meanwhile, the raw material ratio and the reaction path are optimized, and the safety and the product purity are improved.

The invention belongs to the field of flotation, and particularly relates to a method for flotation of copper cobalt oxide ore by using magnesium-containing tailing water, the magnesium-containing tailing water is used as flotation water to carry out five-stage roughing on the copper cobalt oxide ore, the first-stage roughing is carried out under a vulcanizing agent and a xanthate-thionocarbamate collecting agent, and the second-stage roughing is carried out under the action of a flotation agent; and the second-stage roughing is carried out under the condition of containing a compound additive, a vulcanizing agent and xanthate-hydroximic acid. The third-stage roughing is carried out under the action of a vulcanizing agent and xanthate-hydroximic acid; and the fourth-section roughing process and the fifth-section roughing process are carried out under the action of a hydroximic acid collecting agent. The compound additive comprises a component A and a component B with a structure shown in a formula 1 (# imgabs0 #); the component A comprises at least one of ammonium carbonate, ammonium bicarbonate, ammonium nitrate, ammonium acetate, ammonium sulfate and ammonium chloride; and the composite collecting agent comprises a xanthate collecting agent and a hydroximic acid collecting agent. By means of the method, the problem of flotation degradation caused by magnesium-containing tailing water recycling can be solved, and the excellent flotation effect can be achieved.

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention relates to a preparation method of a silicon-carbon negative electrode material capable of reducing interface side reaction, which comprises the following steps: (S1) carrying out chemical vapor deposition on porous carbon by using organic silicon source gas to enable amorphous silicon to be attached in pores of the porous carbon to obtain a silicon-carbon composite material; and (S2) mixing a passivating agent with the silicon-carbon composite material, and then carrying out gradient heat treatment to obtain the silicon-carbon negative electrode material capable of reducing the interface side reaction, the passivating agent is compounded by ammonium carbonate and / or ammonium bicarbonate, C2-C8 aliphatic polybasic acid and organic salt of lithium according to the mass ratio of 1: (1.5-3): (0.8-1.5). All the components in the passivator cooperate with one another, surface amorphous silicon in porous carbon is partially passivated to form a uniform and compact passivation layer, and a small amount of carbon coating layers coating the surface of the porous carbon are formed in the passivation process, so that the interface side reaction of the material is obviously reduced.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

The present application relates to a low-temperature high-performance oxygen storage material, a preparation method, and an automobile tail gas purification catalyst. The preparation method comprises: preparing a solution A1, wherein the solution A1 contains cerium, zirconium, and a metal modified doping element; preparing a solution A2, wherein the solution A2 contains ammonium carbonate and ammonia water; using a silane coupling agent to modify nanoparticles to obtain a slurry A3; jointly titrating and precipitating the solution A1, the solution A2, and the slurry A3, and when titration is completed, adding concentrated ammonia water and stirring to obtain a slurry B; sequentially performing low-temperature aging treatment and high-temperature aging treatment on the slurry B to obtain a slurry C; heating the slurry C to a set temperature, then adding concentrated ammonia water and a surfactant into the slurry C, and performing a stirring reaction to obtain a slurry D; and performing suction filtration and washing on the slurry D, and drying and roasting a filter cake obtained by suction filtration and washing, to obtain a low-temperature high-performance oxygen storage material. The present application can solve the problems in the related art of relatively poor low-temperature reaction activity of an oxygen storage material, and the incapability of dealing with low-temperature ignition when a hybrid vehicle type frequently starts and stops.

The invention provides lightweight non-sintered ceramsite prepared from machine-made sand tailing mud as well as a preparation method and application of the lightweight non-sintered ceramsite, and relates to the field of lightweight building materials. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 50-65 parts of machine-made sand tailing mud, 35-50 parts of fly ash, 10-25 parts of cement, 16-19 parts of quick lime, 1-4 parts of ammonium carbonate and 12-18 parts of water; the method comprises the following steps: dehydrating and crushing the machine-made sand tailing mud, and stirring and mixing the materials in a round pot granulator to obtain an unfired ceramsite mixture; spraying the sodium silicate solution into a granulator at a constant speed to obtain spherical particles; and curing to obtain the light non-sintered ceramsite. The quick lime is used for pretreating the machine-made sand tailing mud, the water content of the machine-made sand tailing mud can be reduced, the machine-made sand tailing mud is successfully granulated, the strength of the ceramsite can be effectively improved, meanwhile, the ceramsite is combined with sodium silicate for alkali excitation, ammonium carbonate is used for foaming, preparation is simple, energy consumption is low, the solid waste utilization rate is high, and economic benefits are remarkable.

The invention provides a preparation method of a cathode material for a solid oxide fuel cell, the cathode material for the solid oxide fuel cell, a preparation method of the solid oxide fuel cell and the solid oxide fuel cell, and relates to the technical field of fuel cells. The preparation method of the cathode material for the solid oxide fuel cell comprises the following steps: preparing LSCF powder; dispersing the LSCF powder in a solvent, adding an aluminum nitrate solution and an ammonium carbonate solution, and mixing to obtain a target mixture; standing and settling the target mixture, carrying out solid-liquid separation, and drying the solid to obtain aluminum oxide preloaded LSCF powder; and sintering the LSCF powder pre-loaded with the aluminum oxide to obtain a powder material with the aluminum oxide loaded on the LSCF in situ, and taking the powder material as the cathode material for the solid oxide fuel cell. The stability of the electrochemical performance of the cathode material for the solid oxide fuel cell can be improved.

The invention discloses a cerium oxide material and a preparation method thereof.The preparation method comprises the following steps that 1, inorganic ammonium salt is added into a cerium salt aqueous solution under stirring, stirring continues to be conducted for 1-3 h after adding is completed, and a first reactant is obtained; wherein the molar ratio of cerium salt to inorganic ammonium salt in the cerium salt aqueous solution is 1: (4.7-5.3), and the inorganic ammonium salt is ammonium carbonate and / or ammonium bicarbonate; the molar concentration of cerium salt in the cerium salt aqueous solution is 0.08-0.2 mol / L; 2) performing hydrothermal reaction on the first reactant at 180-200 DEG C for 7-24 hours to obtain a second reactant; 3) carrying out solid-liquid separation on the second reactant, washing the separated solid, and drying the washed solid to obtain a precursor; and 4) roasting the precursor at 600-900 DEG C for 2-5 hours to obtain the cerium oxide material. The preparation method can be used for obtaining the cerium oxide material with the particle size of 100-200nm and the general popcorn-shaped morphology.

The present invention discloses a preparation method and application of nano-dysprosium oxide particles, belonging to the technical field of rare earth material preparation. The preparation method comprises the following steps: preparing a dysprosium nitrate solution; adding deionized water to a reactor, heating the temperature to 50-70°C, and adding a surfactant; slowly adding the dysprosium nitrate solution dropwise for 2-3 hours, controlling the temperature to 50-70°C, adding an ammonium carbonate solution dropwise to control the pH of the system to 5.5-7.5, stirring for 1-2 hours after the addition is completed, obtaining a white precipitate, filtering, and washing to obtain a wet product; and roasting, crushing, and sieving the wet product to obtain nano-dysprosium oxide. The present invention avoids the agglomeration of dysprosium oxide particles during the co-precipitation process by using a prepared polymer surfactant, and the prepared nano-dysprosium oxide particles are uniform in size, have a high specific surface area, and have long-term storage stability.

The invention belongs to the technical field of raw material preparation, and particularly relates to a production method for co-production of isopropanolamine and DL-2-aminopropanol. The production method for co-production of isopropanolamine and DL-2-aminopropanol comprises the following steps: adding ammonium carbonate, ammonium carbamate, epoxypropane and water into a high-pressure reaction kettle, uniformly stirring, heating to 88-90 DEG C, preserving heat for 30-35 minutes under 0.8 MPa, then heating to 100-103 DEG C, reacting for 40-45 minutes under 1.0 MPa, cooling to room temperature, filtering, washing, and drying to obtain the DL-2-aminopropanol. And after the reaction is finished, carrying out post-treatment to obtain a mixture of isopropanolamine and DL-2-aminopropanol. According to the production method for co-production of isopropanolamine and DL-2-aminopropanol, the process is simple, parameters are easy to control, reaction conditions are relatively mild, it is guaranteed that a large amount of monoisopropanolamine and DL-2-aminopropanol are generated, and meanwhile generation of by-products diisopropanolamine and triisopropanolamine is reduced.

The invention relates to the field of pharmaceutical preparations, and particularly discloses a celecoxib orally disintegrating tablet and a preparation process thereof. The invention relates to a preparation process of a celecoxib orally disintegrating tablet. The preparation method comprises the following steps: adding beta-cyclodextrin into deionized water, dissolving to obtain an emulsion, adding celecoxib into the emulsion, and stirring to obtain a matrix liquid; the preparation method comprises the following steps: adding bacterial cellulose into deionized water, adding ammonium carbonate, and carrying out vacuum filtration to obtain a fiber cake; dipping the fiber cake into an absolute ethyl alcohol solution of tetraethyl silicate, washing, drying and grinding to obtain a carrier; adding the carrier into the matrix liquid, stirring at room temperature, centrifuging, and freeze-drying the centrifugate to obtain an inclusion compound; uniformly mixing the inclusion compound with a filling agent, a slipping agent, an adhesive and a sweetening agent, adding pure water, stirring, emulsifying, vacuumizing, defoaming, sub-packaging into bubble caps, pre-freezing, freeze-drying and sub-packaging. The orally disintegrating tablet prepared by the invention is high in disintegration speed, convenient to take, slightly sweet in taste and high in medication compliance of patients.

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

The present invention relates to a coking inhibitor for waste heat boilers, belonging to the technical field of ash cleaning for smelting equipment. The components of the coking inhibitor for waste heat boilers of the present invention include: asbestos powder, manganese dioxide, aluminum oxide and ammonium carbonate. The present invention can control the coking thickness of the convection tube bundle and there is a peeling phenomenon, slow down the growth rate of the coke body, effectively solve the adhesion problem of the flue gas system of the fluidized bed boiler waste heat boiler, and reduce the safety and environmental protection risks.

The invention discloses a green process method for extracting alkali metal from composite ore, and relates to the field of metal extraction.The green process method comprises the following steps that S1, aluminosilicate composite ore containing alkali metal and ammonium carbonate are mixed and roasted, and activated clinker is obtained; s2, mixing the activated clinker with an ammonium citrate solution, carrying out a leaching reaction at 80-95 DEG C, and carrying out solid-liquid separation after the reaction to obtain a leaching solution and leaching residues; according to the green process method for extracting the alkali metal from the composite ore, through systematic coupling of a low-temperature ammonium carbonate activation-ammonium citrate complexing leaching-manganese system / ammonium phosphomolybdate specific adsorption-bipolar membrane electrodialysis closed-loop regeneration technology chain, a synergistic interaction effect is formed; the activation step significantly improves the leaching efficiency of the subsequent mild leaching agent.

To provide a method for producing a leachate containing a nickel ion and a cobalt ion, by using a material containing nickel and cobalt less expensive than metal nickel powder.SOLUTION: A hydroxide particle containing nickel and cobalt is mixed with ammonia water preferably containing ammonium carbonate or ammonium hydrogen carbonate prepared such that an ammonium carbonate concentration or an ammonium hydrogen carbonate concentration is within a range of 0.5 mol / L to 4.1 mol / L, to obtain a slurry. A leach treatment is applied to the obtained slurry under a prescribed temperature condition to obtain a leachate containing a nickel ion and a cobalt ion leached from the hydroxide particle.SELECTED DRAWING: Figure 2

The invention discloses a method for preparing nano calcium carbonate by using fluorite leachate, and belongs to the technical field of hydrometallurgy. According to the method, metallurgical-grade fluorite is subjected to magnetic separation iron removal and hydrochloric acid solution leaching, high-purity fluorite and a calcium chloride solution are obtained, and meanwhile carbon dioxide gas is generated; removing impurities from the calcium chloride solution, reacting the calcium chloride solution with an ammonium carbonate solution to form a calcium carbonate emulsion, aging the calcium carbonate emulsion, filtering and separating to obtain nano calcium carbonate and filtrate; heating the filtrate to generate hydrogen chloride and ammonia gas, absorbing hydrogen chloride by water to form a hydrochloric acid solution, and recycling; ammonia gas and carbon dioxide are absorbed by water to generate an ammonium carbonate solution for recycling. According to the method, the metallurgical-grade fluorite is purified, meanwhile, the nano calcium carbonate product with the high additional value is prepared through the fluorite leaching solution, cyclic utilization of hydrochloric acid, ammonium carbonate and the like can be achieved, and the method has the advantages of being environmentally friendly, capable of saving energy, reducing consumption, simple, efficient and the like and is beneficial to large-scale application and popularization.

The invention relates to the technical field of tea aroma detection, in particular to a noble metal-sensitized volatile aroma substance sensor construction and detection method, which comprises the following steps: dissolving zinc acetate dihydrate, urea and trisodium citrate dihydrate in deionized water to obtain a mixed precursor solution; controlling the hydrothermal reaction of the precursor solution; after naturally cooling to room temperature, washing, centrifuging, drying and calcining to obtain a zinc oxide material; the preparation method comprises the following steps: impregnating a zinc oxide material with deionized water, adding an ammonium carbonate solution while stirring, stirring, and then adding a noble metal solution to obtain a noble metal modified zinc oxide mixed solution; centrifuging, drying and calcining to obtain a powder zinc oxide loaded noble metal material; dissolving the zinc oxide loaded noble metal material in ethanol, performing ultrasonic treatment to form turbid liquid, and further dispensing the turbid liquid to the surface of a planar electrode to construct a semiconductor sensor for detecting tea aroma; the sensor prepared by the method has excellent sensing characteristics of high sensitivity, high stability and the like on tea aroma.

The application discloses a catalyst for preparing malononitrile, a preparation method of the catalyst and a method for preparing malononitrile by using the catalyst. The catalyst is a solid catalyst, which is an acidic catalyst loaded with rare earth metal oxide. The method for preparing malononitrile is that cyanoacetic acid or cyanoacetate or cyanoacetamide and an ammonia source are subjected to ammoniation dehydration reaction in a continuous reactor to prepare malononitrile according to a certain molar ratio. Then, vacuum distillation (20 torr-25 torr) is carried out, and a fraction collected at 110 DEG C-120 DEG C is malononitrile product. The ammonia source can be ammonia gas, ammonia water, ammonium carbonate or urea. The method for preparing malononitrile can reduce production cost, improve production safety, reduce the discharge amount of three wastes in the preparation of malononitrile by using an existing process, and improve product quality, and is a sustainable and green synthesis route.

The application provides a catalytic denitration agent and a preparation method thereof, and comprises the following components: a reducing base: urea 30-60 parts, ammonium carbamate 10-25 parts, ammonium carbonate 5-15 parts, ammonium bicarbonate 5-15 parts; a phase change catalytic component: ammonium dihydrogen phosphate 2-6 parts, di-ammonium hydrogen phosphate 1-5 parts, molybdate 0.05-0.5 parts, tungstate 0.1-0.8 parts, organic acid metal salt 0.1-0.8 parts, modified zeolite 1-8 parts; a functional additive: dispersant 0.2-1.0 parts, surfactant 0.1-0.6 parts, corrosion inhibitor 0.05-0.2 parts. The application constructs a multi-component complex catalytic system, and the prepared high-molecular catalytic denitration agent can realize the unity of wide-temperature high-efficiency denitration, low corrosion, low ammonia escape and high operation stability while significantly reducing the phase change temperature and energy consumption, and effectively solves the multiple problems of harsh reaction conditions, unstable efficiency and equipment corrosion in the prior art.

Described herein are methods for stabilizing a subterranean formation. The method may include introducing urea into a subterranean formation, wherein the subterranean formation includes sand, and wherein the subterranean formation includes a calcium salt, and introducing an amylase into the subterranean formation, wherein the amylase hydrolyzes the urea to form ammonium carbonate, and calcium in the calcium salt reacts with carbonate in the ammonium carbonate to form a calcium carbonate precipitate.

The invention provides a silica gel carrier and a preparation method thereof. The preparation method comprises the following steps: providing a first silicate aqueous solution with the pH value of 9-10 as a base solution; mixing the second silicate aqueous solution, inorganic acid and the base solution, and aging at 70-80 DEG C to obtain a first mixed solution with the pH value of 9-13; mixing the first mixed solution, an alkaline substance and organic alcohol, adjusting the pH value to 10-12, and carrying out a first reaction to obtain a second mixed solution; mixing the second mixed solution, an alkaline substance and organic alcohol, adjusting the pH value to 11-12, and carrying out a second reaction to obtain a hydrogel system; mixing the hydrogel system with inorganic acid, and adjusting the pH value to 5-6; performing post-treatment to obtain a silica gel carrier; wherein the alkaline substance comprises one or a combination of more than two of ammonia water, ammonium carbonate and ammonium bicarbonate. The silica gel carrier provided by the invention has excellent pore structure and particle size distribution.

This application relates to the field of materials, and provides a method for preparing all-starch foamed tableware. By weight, the all-starch foamed tableware comprises the following components: 85-92 parts of composite modified starch, 23-38 parts of plant cellulose, 1-2 parts of foaming agent, 3.5-7 parts of nucleating agent, 1-1.5 parts of plasticizer, and 3-6 parts of crosslinking agent; wherein the foaming agent includes at least one of sodium bicarbonate, ammonium bicarbonate, and ammonium carbonate; the nucleating agent includes at least one of talc, calcium carbonate, montmorillonite, diatomaceous earth, straw powder, chitosan, and cyclodextrin; the plasticizer includes at least one of glycerol, sorbitol, ethanol, and water; and the crosslinking agent includes at least one of citric acid, malic acid, tartaric acid, maleic acid, succinic acid, and adipic acid. This application not only comprehensively improves the water resistance, heat resistance, mechanical strength, and cell uniformity of the all-starch foamed tableware, but also ensures that the product meets usage requirements.

The invention discloses a method for comprehensively recycling yellow phosphorus slag of an electric furnace, and belongs to the technical field of chemical engineering. Comprising the following steps: grinding slag, adding nitric acid in proportion, reacting dicalcium silicate in the slag with nitric acid to generate calcium nitrate and silicon slag, and reacting calcium nitrate with ammonium carbonate to prepare an ammonium nitrate product and a calcium carbonate product; and washing and separating the silicon slag to obtain orthosilicic acid, returning one part of orthosilicic acid to be re-blended with the phosphate ore to enter the furnace so as to recycle the slag, and calcining the rest part of orthosilicic acid to obtain a white carbon black product. The use amount of silica is reduced, mineral resources of silica are saved, and the use amount of silica produced from yellow phosphorus reaches self-balance.

The invention relates to the technical field of comprehensive utilization of vanadium titano-magnetite resources, in particular to a flotation combined reagent and a flotation method for vanadium titano-magnetite associated ultralow-grade cobalt-nickel ore. The flotation combined reagent comprises a copper ammonia compound activating agent composed of copper sulfate, ammonium carbonate and sodium citrate, a compound inhibitor composed of sodium humate, tannic acid and sodium tripolyphosphate, a main collecting agent butyl xanthate, an auxiliary collecting agent alkyl hydroxamic acid and a foaming agent diethylene glycol monobutyl ether. According to the method, a technical system of bulk flotation process-novel collaborative reagent system is constructed, so that the technical problem of recycling associated ultralow-grade cobalt and nickel resources in the vanadium titano-magnetite iron separation tailings is successfully solved, the problem of low separation efficiency of ultralow-grade minerals is effectively solved, a complete and efficient technical scheme is formed, and the method is suitable for industrial production. And an innovative technical path is provided for comprehensive recovery of associated cobalt and nickel resources of the vanadium titano-magnetite.

The invention discloses a process for industrially preparing nano aluminum oxide, which is characterized in that the calcination temperature of alpha-Al2O3 is reduced by adding high-purity aluminum oxide seed crystals, and the high-purity aluminum oxide seed crystals are obtained by using high-purity aluminum chloride and high-purity ammonium carbonate as raw materials and synergistically dispersing and calcining an ammonium salt dispersing agent and high-purity vitamin C; the ammonium salt dispersing agent is double-end tetraethylammonium fluoride polyethylene glycol, disperses the precursor through coordination of steric hindrance and charges, and provides fluorine ions during calcination to reduce the temperature required for completing alpha phase change; the obtained high-purity alumina seed crystal and nano alumina have the characteristics of high purity and small and uniform powder particle size.

The invention discloses an aluminum oxide loaded non-noble metal double-site synergistic catalyst, a preparation method and application, and relates to the technical field of catalysts, and the catalyst shows remarkable metal cluster and metal oxide synergistic catalytic ability in application. The preparation method comprises the following steps: weighing a proper amount of aluminum nitrate and non-noble metal salt, adding water to prepare a solution, dropwise adding ammonium carbonate or an ammonia water solution into a non-noble metal salt solution to form gel, and aging in a stirring state; and then drying, roasting and reducing to obtain the alumina-loaded non-noble metal double-site synergistic catalyst. The catalyst shows excellent catalytic performance in propane catalytic dehydrogenation reaction. The catalyst has the advantages of being simple in preparation method, high in stability, low in cost, high in practicability and capable of being repeatedly used, and a novel non-noble metal environment-friendly catalyst capable of being industrialized is provided for propylene preparation through propane catalytic dehydrogenation.

The invention provides a thick oil viscosity reducer, and belongs to the technical field of petrochemical engineering. According to the technical scheme, alkylphenol or alkyl naphthol and solvent oil are mixed to serve as a first component, and the carbon chain length of alkyl and the optional range of the solvent oil are limited. On the basis, nitrilotriacetic acid, ammonium citrate, sodium potassium tartrate tetrahydrate and other components are used as modifiers to be mixed with a surfactant, and a cosolvent and an auxiliary agent are added; wherein the cosolvent can be selected from ethylene glycol ether or polyoxyethylene alkylamine, and the auxiliary agent can be selected from triethanolamine or dodecanol polyoxyethylene ether sodium sulfonate; urea or ammonium carbonate is innovatively introduced into the third component to serve as a regulator and is mixed with sulfonate and glycerin, and the viscosity reduction effect can be remarkably improved. Experimental verification shows that the static viscosity reduction rate of the viscosity reducer to high-viscosity crude oil can reach 99.42%-99.85%, and the static viscosity reduction rate is comprehensively superior to the static viscosity reduction rate average level of 98%-99% in the industry.

The invention discloses a coupling fire extinguishing agent with functions of extinguishing fire and removing carbon monoxide in a fire scene in a limited space, and the coupling fire extinguishing agent is prepared from the following raw materials in 100 parts: 75-80 parts of a fire extinguishing base material, 12-15 parts of a manganese oxide molecular sieve, 5-8 parts of a lubricating agent and 4-6 parts of a moisture-proof agent, wherein the haloxylon ammodendron fire extinguishing base material comprises sodium bicarbonate, ammonium carbonate and ammonium phosphate. Researches show that the removal efficiency of the coupling fire extinguishing agent for removing the carbon monoxide can be regulated and controlled by changing the content of the catalyst, and the optimized catalyst can effectively promote the catalytic oxidation process of the carbon monoxide. According to the preparation method of the coupling fire extinguishing agent, carbon monoxide is removed by changing the ratio of the catalyst to the fire extinguishing agent, in the treatment process of the catalyst and the fire extinguishing agent, the particle size of each component is controlled through a crusher and a sieve, and the coupling fire extinguishing agent has excellent catalytic activity and structural stability.