1103 results about "Catalysis" patented technology

The invention discloses a catalyst used for preparing acrylic acid and butyl ester by the dehydration of butyl lactate and a preparation method thereof. The catalyst is a composite catalyst, comprising a main catalyst A and auxiliary catalysts B, C, D and E, wherein, A is calcium sulphate, B is sulphuric acid, C is phosphate, D is alkaline matter and E is promoter. The preparation method comprises the steps as follows: five compositions A, B, C, D and E are sufficiently mixed, baked for 2-10 hours at the temperature of 200-800DEG C and formed for standby. The catalyst has high catalytic activation; under the catalysis of the catalyst, the molar yield reaches 75.1 percent and the molar selectivity of the acrylic acid and butyl ester reaches 71.5 percent. The preparation method has the advantages that the crystal structure of the main catalyst can be improved so as to be beneficial for carrying out the reaction; and the introduction of different auxiliary catalysts and quantities is helpful to improve the conversion ratio of the raw material and the product selectivity and is beneficial for improving the strength of the catalyst.

The invention discloses an arginine decarboxylase diaA enzyme mutant and application thereof in preparation of butanediamine, and belongs to the field of bioengineering. According to the invention, rational charge overturning transformation is simultaneously carried out on a pentamer meridian oligomeric interface and a dimer latitudinal oligomeric interface, so that stable assembly and efficient catalysis of the decamer under the condition of neutral to alkaline pH (7.0-9.0) are realized. Wherein positive charges are introduced into a meridian interface to weaken electrostatic repulsion, and negative charges are introduced into a latitudinal interface to enhance dimer compactness and substrate transfer efficiency. The specific enzyme activity of the representative double mutant AdiAD110K / H736E at pH 8.0 is about 35 times that of a wild type, and the representative double mutant AdiAD110K / H736E keeps a complete decamer state in a pH range of 7.0-9.0. The yield of butanediamine is up to 145.9 g / L under the whole-cell catalysis of the mutant.

The invention discloses a rational copolymerization strategy for improving the stability of an oligomeric structure of acid-induced high-order oligomeric decarboxylase AdiA in a neutral to alkaline environment and application of the rational copolymerization strategy, and belongs to the field of bioengineering. According to the strategy, rational charge overturning transformation is carried out on a pentamer radial oligomeric interface and a dimer weft-wise oligomeric interface at the same time, and stable assembly and efficient catalysis of a decamer under the condition that the pH value is from 7.0 to 9.0 from neutral to alkaline are achieved. Wherein positive charges are introduced into a meridian interface to weaken electrostatic repulsion, and negative charges are introduced into a latitudinal interface to enhance dimer compactness and substrate transfer efficiency. The specific enzyme activity of the representative double mutant AdiAD471K / E467K / H736E is 45.5 times that of a wild type when the pH value is 8.0, and the representative double mutant AdiAD471K / E467K / H736E keeps a complete decamer state when the pH value is 7.0-9.0. The yield of butanediamine is up to 156.5 g / L by using the mutant to catalyze whole cells.

The application provides a masterbatch type vulcanization aid and a preparation method thereof, a rubber composition, a rubber product and a tire. The preparation method comprises the following steps: S1, pre-reaction of stearic acid, an antioxidant and a vulcanization system to obtain a pre-reaction mixture; and S2, mixing of the pre-reaction mixture with rubber to obtain the masterbatch type vulcanization aid. Under the catalysis of stearic acid, the reagents in the antioxidant and the vulcanization system react to generate active intermediates. The active intermediates have the effect of promoting vulcanization and play the role of activating accelerators in advance, so that the active intermediates can replace the role of zinc oxide. The product after reaction is mixed with rubber, and the masterbatch formed can be used to prepare rubber products such as tires without containing zinc elements, so that zinc emission can be realized, and the environment is friendly.

The invention belongs to the technical field of chemical catalysis, and particularly relates to a preparation method of an alkali metal cation modified cobalt-nitrogen-carbon monatomic catalyst and application of the catalyst in electrosynthesis of hydrogen peroxide. The Co-N-C / X catalyst is obtained by taking a cobalt-containing compound as a metal source, mixing the metal source with a nitrogen-containing organic matter and a carbon material, performing rotary evaporation, grinding and high-temperature pyrolysis in an inert atmosphere, performing acid washing with strong acid to construct surface defects, and finally performing stirring adsorption with an alkali metal salt solution, suction filtration and drying. Alkali metal cations are physically adsorbed and anchored on the surface and interface of the Co-N-C catalyst instead of being dissolved in a solution, so that the electronic structure of Co active sites and the adsorption energy of the * OOH intermediate are optimized, and the problem of separation of alkali metal and a product is solved. When the catalyst is used for electro-catalytic oxygen reduction reaction, the H2O2 selectivity reaches up to 98%, the preparation process is simple, the cost is low, large-scale production can be realized, and the problems that the traditional method is high in energy consumption and large in pollution and the existing catalyst is insufficient in selectivity are solved.

The invention discloses a D-psicose 6-phosphate phosphatase mutant and application of the D-psicose 6-phosphate phosphatase mutant in preparation of psicose, and belongs to the technical field of enzyme engineering. According to the invention, site-directed mutagenesis is carried out on an amino acid sequence of D-psicose 6-phosphate phosphatase A6PP, and a combined mutant I21V / Y73F / R115M / T180V / L203I / Q193E is constructed, so that the substrate specificity, the thermal stability and the catalytic activity of the combined mutant are all remarkably improved. The invention further provides application of the combined mutant in preparation of psicose through multi-enzyme cascade catalysis, 150 g / L of maltodextrin can be converted into 97.7 g / L of D-psicose, the conversion rate reaches 65.1%, and the application prospect of the combined mutant in the field of food is widened.

The utility model relates to the technical field of waste gas treatment, in particular to a waste gas treatment device based on malodorous organic waste gas, which comprises a box body provided with a gas inlet, a containing cavity and a gas outlet, and the gas inlet, the containing cavity and the gas outlet form a waste gas treatment channel; the treatment assembly is arranged in the containing cavity and comprises at least two electrochemical oxidation units which are arranged in series in the air inlet direction, and each electrochemical oxidation unit is composed of an electro-catalysis set and a chemical catalyst plate which are connected. The multiple electrochemical oxidation units are arranged in the box body in the air inlet direction in series, waste gas is cooperatively treated through electro-catalysis and chemical catalysis, large-batch stink organic waste gas which is continuously and rapidly introduced can be effectively treated, it is ensured that gas at an air outlet reaches the emission standard, energy consumption is reduced, meanwhile, the treatment effect is improved, and the treatment cost is reduced. The environment-friendly requirement is met. In addition, the requirement of secondary treatment can be avoided, the overall treatment efficiency is improved, and the subsequent treatment cost is reduced.

The invention provides a self-coupling waste gas treatment system for treating VOCs in waste gas and a treatment method of the self-coupling waste gas treatment system, and belongs to the technical field of VOCs removal and recovery. The self-coupling waste gas treatment system comprises a microwave catalysis unit, wherein to-be-treated waste gas is introduced into the microwave catalysis unit, so that VOCs (Volatile Organic Compounds) are primarily decomposed and then enter a multi-stage condensation unit; the multi-stage condensation unit comprises at least two stages of condensation treatment parts and is configured to be in a cold source cyclic utilization mode, liquid separated after the waste gas to be treated is subjected to condensation treatment in the multi-stage condensation unit is recycled, and meanwhile, separated gas enters the drying adsorption unit; and the emission detection unit is configured to detect whether the purified waste gas from the drying adsorption unit reaches the emission standard or not, and the waste gas which does not reach the emission standard is re-introduced into the microwave catalysis unit to be circularly treated. The self-coupling system disclosed by the invention is high in integration level, and the whole-process efficient management and control of VOCs from pretreatment, deep recovery and fine treatment to up-to-standard emission is realized.

The invention discloses a self-cleaning composite piezoelectric ceramic membrane as well as a preparation method and application thereof, and belongs to the field of composite ceramic membranes. The technical problem that an existing ceramic membrane separation technology is poor in biomembrane pollution resisting effect is solved. According to the preparation method, the barium titanate ceramic membrane is firstly prepared to serve as the base membrane, then the copper oxide one-dimensional nanostructure is loaded on the piezoelectric ceramic substrate, and the base membrane has a large membrane surface area and can be combined with more catalysts, so that more active sites are provided for catalytic reaction; according to the composite membrane, the hydrophilicity, the anti-pollution performance and the piezoelectric catalysis self-cleaning performance of the membrane are remarkably improved, and pollutants in water can be quickly and effectively separated, so that the flux and the anti-pollution performance of the membrane are improved.

The invention relates to the technical field of fuels and additives thereof, in particular to an alcohol fuel with a catalytic effect and an additive thereof.The alcohol fuel with the catalytic effect comprises C1-C7 alcohol and hydrocarbon, and a rare earth compound catalytic material is used in the fuel; the rare earth compound comprises a hydroxyl group or a phenyl group or a C5-C25 group or a carboxyl group or an amino group or a metal, the alcohol fuel is high in formula calorific value adjustable calorific value, can well adapt to an internal combustion engine or an engine for testing the alcohol fuel, is a novel alternative energy with potential, and can be used for preparing the alcohol fuel. The environmental protection problem of fossil fuel is solved, and the fuel efficiency is accelerated.

The utility model relates to a treatment system for purifying high-salinity wastewater, which is suitable for treating high-salinity wastewater, particularly desulfurization wastewater of a coal-fired power plant and coal chemical wastewater. By combining efficient flocculation, ozone catalysis and membrane distillation technologies, a self-made chitosan-based flocculant is added in a flocculation stage, and suspended solids and heavy metal ions in wastewater are removed by utilizing good adsorption performance and flocculation capacity of the self-made chitosan-based flocculant; in the ozone catalysis stage, a self-made ternary composite catalyst is added, ozone decomposition is promoted, and organic pollutants are further removed; in the membrane distillation stage, a self-made antifouling and moisture-resistant composite membrane is used for efficient desalination and concentration, and finally efficient purification and recycling of the high-salinity wastewater are achieved. The process can significantly improve the wastewater treatment effect, reduce the concentration of salt and harmful substances in the wastewater, also reduce the operation cost, and is suitable for large-scale industrial wastewater treatment.

The utility model discloses a microwave catalysis Fenton synergistic reaction device for organic wastewater treatment, which relates to the field of white spirit wastewater treatment and comprises a reaction box, a microwave generator for generating a microwave field into the reaction box is arranged on the reaction box, and a driving mechanism and an air pump are further arranged on the reaction box. A stirring shaft of the driving mechanism extends into the reaction box, a stirring blade is arranged on the stirring shaft, a plurality of air holes are formed in the stirring blade, and the air pump is communicated with the air holes. According to the device, gas generated by the gas pump acts into the reaction tank, so that the mixing strength of wastewater and a Fenton reagent in the reaction tank can be improved, the purpose of cooling the wastewater can be achieved, and the oxidative degradation capacity of organic pollutants in the wastewater is improved.

The invention provides an industrial electrode for synthesizing urea through electro-catalysis C-N coupling and a preparation method and application of the industrial electrode, and belongs to the field of urea synthesizing.The industrial electrode for synthesizing urea through electro-catalysis C-N coupling comprises a conductive substrate and an electro-catalysis material coating the surface of the conductive substrate; the electrocatalytic material comprises a magnesium oxide modified copper oxide catalyst, and MgO nanoparticles and CuO nanoparticles in the magnesium oxide modified copper oxide catalyst are in contact with each other to form a heterostructure. The magnesium oxide modified copper oxide catalyst is used as an electro-catalysis material, MgO nano-particles and CuO nano-particles in the catalyst material are in contact with each other to form a heterostructure, after MgO is introduced, the CO2 adsorption and activation capacity is improved, CO and NHx coupling is promoted, and the urea Faraday efficiency is improved. The industrial electrode shows excellent selectivity and stability in the process of electro-catalytic synthesis of urea.

The utility model discloses a waste gas heating and catalyzing treatment device for a tobacco factory, relates to the technical field of waste gas treatment, and aims to solve the problems that the process of starting a machine body of heating and catalyzing equipment is complicated, and a catalyzing part in the heating and catalyzing equipment is difficult to take out and replace. A pushing mechanism is arranged on the outer wall of the rear end of the heating catalytic device; a sealing assembly for blocking the through hole is arranged on the outer wall of the front end of the heating catalytic device; a cam rotates to extrude a stress plate, the stress plate pushes a moving plate to move through a sliding rod, a catalytic plate is pushed out through a through hole, a sealing door is pulled to move through a handle, a fixing block pushes an inserting rod, when the fixing block moves to an inserting groove and coincides with the inserting rod, a third spring pushes the inserting rod to be inserted into the inserting groove, and the catalytic plate is pushed out through the through hole. The sealing door is locked and limited, blocking of the through hole is relieved, and the problems that the process is tedious when the machine body of the heating catalytic equipment is started, and a catalytic part in the heating catalytic equipment is not easy to take out and replace are effectively solved.

The invention discloses a coupling adsorption-photo-thermal catalysis underground CO gradient absorption method, and relates to the technical field of underground CO gradient absorption, and the method comprises the following steps: in-situ loading plasma enhanced photo-thermal catalysis nanoparticles on the surface of a modified metal organic framework material to construct a dynamic coupling layer; the dynamic coupling layer is integrated in a modular reaction unit with a gas circulation channel to form an underground CO treatment basic unit; according to the method, underground CO treatment basic units are arranged along a ventilation main path and an easy-to-accumulate area of an underground roadway, each reaction unit is provided with an independent and controllable near-infrared light source, and high-precision CO concentration sensors are installed on the periphery of each reaction unit, so that a distributed monitoring and response network is formed; cO concentration data at the positions of all the reaction units are collected based on the distributed monitoring and response network, a spatial gradient distribution diagram of underground CO concentration is generated based on spatial continuity characteristics, and an abnormal area with the concentration higher than a safety threshold value is recognized.

The invention relates to an installation for liquefying hydrogen, comprising a circuit for hydrogen to be cooled, a set of heat exchanger(s) in heat exchange with the circuit, a cooling system comprising a refrigerator with a cycle of refrigeration of a first cycle gas comprising helium and / or hydrogen, the circuit comprising at least one catalysis section so as to ensure conversion of the ortho-hydrogen into para-hydrogen, the circuit further comprising a first bypass portion bypassing at least one catalysis section, the downstream end of the circuit comprising two parallel branches that are not combined and are supplied respectively with the hydrogen that has passed through the first bypass portion and hydrogen that has passed through the catalysis section so as to provide two distinct hydrogen streams that have different relative proportions of ortho-hydrogen and para-hydrogen.

The invention relates to the technical field of material preparation and environmental catalysis, and particularly discloses a nitrogen and sulfur co-doped algae-based carbon loaded cobalt monatomic catalyst which is formed by compounding nitrogen and sulfur co-doped algae-based porous carbon, cobalt monatomic and cobalt nanoclusters. The total loading amount of cobalt in the catalyst is 1.2-1.3 wt%. The nitrogen-sulfur co-doped algae-based carbon-loaded cobalt monatomic catalyst prepared by the preparation method disclosed by the invention is combined with persulfate, so that rapid activation and degradation of pollutants can be realized in a short time, and the catalyst has remarkable dynamic advantages and catalytic efficiency and long-term stability.

The invention provides a cobalt modified multistage heterostructure catalyst and a preparation method and application thereof, and belongs to the technical field of ammonia synthesis. The cobalt modified Con-Cu3P / Cu catalyst is prepared by depositing copper and cobalt on a substrate step by step and then carrying out calcination, phosphorization and electrochemical reduction. In the catalyst, the metal Co mainly exists in the catalyst in the form of an elementary substance, Cu exists in the form of elementary substance Cu and monovalent Cu3P, and the problem that protonation of an intermediate is limited is solved by modifying and regulating an electronic structure through Co. The Co-Cu3P / Cu catalyst is used for electro-catalysis nitrate reduction reaction (NO3RR), and sustainable green ammonia (NH3) synthesis and nitrate (NO3 <->) pollutant removal can be achieved.

According to the fisetin nanoparticle preparation method, the fisetin nanoparticle product and the application, the synergistic effect of amino acid catalysis and a microwave or ultrasonic energy field is matched with mixing self-assembly and subsequent spray drying forming under the acidic condition, on one hand, the traditional Maillard reaction period is greatly shortened, and energy consumption is reduced; on one hand, the whole technological process of wall material preparation and active ingredient loading is simplified, the large-scale production requirement is met, on the other hand, the fisetin encapsulation effect and the nanoparticle structure stability are improved, the defects that fisetin is poor in water solubility and low in bioavailability are overcome, meanwhile, it is guaranteed that the nanoparticle product quality is uniform, the technology efficiency and the product performance superiority are considered, and the method is suitable for industrial production. The core pain points of low efficiency, poor drug loading effect and insufficient product stability of the existing traditional process are effectively overcome.

The invention discloses an advanced organic wastewater treatment method and treatment device based on an advanced oxidation coupling coagulation denitrification method, and relates to the technical field of landfill leachate treatment, kitchen waste treatment, kitchen garbage treatment and the like, the treatment device comprises a coagulation tank unit, a flocculation tank unit, an air floatation and filter tank unit, an ozone catalysis unit and an activated carbon filter unit which are connected in sequence, the ozone generation unit and the tail gas decomposition unit are connected with the ozone catalysis unit. According to the invention, a traditional nanofiltration membrane advanced treatment process in the industry is replaced by an advanced treatment process of coagulation, flocculation, air floatation, filtration, ozone catalysis and activated carbon filtration, so that the generation of a concentrated solution is avoided; the defect that the biogas yield of an anaerobic digestion system is reduced due to the fact that the sulfate-containing concentrated solution flows back to the anaerobic digestion system of the landfill leachate treatment plant or the kitchen waste treatment plant is overcome, the load of a biogas desulfurization system of the landfill leachate treatment plant and the kitchen waste treatment plant is reduced, and the consumption cost of the concentrated solution is greatly reduced.

The invention relates to the field of functional materials, in particular to chemical recycling of a series of polyesters represented by PET (Polyethylene Terephthalate) by using a novel and efficient magnesium-based catalyst technology, which is of great significance for treating plastic pollution and realizing green circular economy.

The invention discloses a detoxification system for washed household garbage incineration fly ash, and belongs to the technical field of hazardous waste treatment. Comprising a fly ash temporary-storage tempering unit, a low-temperature anti-sticking drying unit, a temperature-control anti-scaling pyrolysis unit and a gas-solid separation unit which are connected in sequence. The fly ash caching and tempering unit is provided with a calcium salt content online detector and an anti-caking agent adding device, so that accurate tempering is realized; the low-temperature anti-sticking drying unit realizes low-temperature anti-sticking drying; the temperature-control anti-scaling pyrolysis unit adopts an indirect heating type rotary kiln and is provided with a plasma catalysis assembly, so that medium-temperature degradation of dioxin and scaling prevention are realized; the gas-solid separation unit comprises an efficient cyclone separator, a high-temperature ceramic dust remover and a water-cooled conveyor, and efficient separation and cooling are achieved. Through systematic structural design and integration, the technical problems that the calcium salt-containing fly ash after water washing is prone to caking and scaling in the treatment process, and dioxin degradation is not thorough are effectively solved.

The invention discloses a method for predicting the coverage degree of an H ion negative electrode in a Zn aqueous battery, and relates to the technical field of surface catalysis. In order to solve the defect that in the prior art, it is difficult to accurately predict the coverage degree of H ions on the surface of a Zn negative electrode on a multi-scale level, the technical scheme provided by the invention comprises the steps that a three-dimensional atom structure model of H atoms and a Zn electrode adsorption surface is constructed, formation energy and adsorption energy of the H ions and water molecules are calculated, and a reaction potential energy surface is established; constructing a reaction path and an electron transfer behavior, defining potential related parameters, and outputting reaction rate, current density and coverage data; establishing a phase field dilute material transfer model containing temperature, pH and pressure parameters, and completing material migration and charge distribution calculation; interface physical field parameters are fed back to the microdynamics model to form microcosmic-macroscopic bidirectional data interaction and realize self-consistent convergence; and outputting a coupling model result to obtain multi-scale prediction data. The method is suitable for active site identification and performance prediction in electro-catalytic reaction.

The invention discloses a low-cost nano porous silicon-carbon composite material based on a solid waste silicon source as well as a preparation method and application thereof. The preparation method comprises the following steps: taking a solid raw material containing silicon dioxide as a silicon source; carrying out wet ball milling on the pretreated raw materials; mixing the ball-milled material with magnesium powder, aluminum chloride and lithium chloride; carrying out heating reduction reaction on the mixed material; sequentially performing hydrochloric acid pickling and hydrofluoric acid pickling on the reduction product, and then washing to be neutral; mixing the washed silicon particles with a carbon precursor containing nitrogen and sulfur, coating by adopting a spray coating method, and then carrying out carbonization treatment; the carbon precursor containing nitrogen and sulfur is composed of asphalt and thiourea; the carbonization temperature is 750-850 DEG C, the carbonization time is 1-2 hours, and the heating procedure comprises a desolventizing section, an asphalt decomposition section and a carbonization section. The preparation method is low in raw material cost, low in energy consumption, environment-friendly and excellent in product comprehensive performance, and has wide application prospects in the fields of power batteries, energy storage, catalysis and the like.

The invention relates to the technical field of new energy chemical catalysis, in particular to a catalyst for preparing formaldehyde through photo-thermal catalysis of methane under gas-solid continuous flow as well as a preparation method and application of the catalyst. The preparation method comprises the following steps: S1, preparing a pretreatment carrier; s2, preparing a precursor solution: S201, adding a palladium chloride solution into the zinc oxide suspension, stirring at room temperature, carrying out vacuum suction filtration, washing and drying to obtain a Pd / ZnO precursor; s202, dispersing the Pd / ZnO precursor in deionized water, adding rare earth metal salt, dropwise adding triethylene tetramine, stirring, and adding sodium hypophosphite to obtain a precursor solution; s3, preparing a composite precursor; and S4, carrying out post-treatment. The invention provides a catalyst for preparing formaldehyde through photo-thermal catalysis of methane under gas-solid continuous flow as well as a preparation method and application of the catalyst, and aims at solving the problems that in related technologies, the activation difficulty of methane C-H bonds is high, formaldehyde is prone to deep oxidation, and the operation efficiency of the catalyst in a gas-solid continuous flow system is low.

The invention relates to the technical field of spherical particle dysprosium oxide, and discloses monodisperse spherical particle dysprosium oxide with the particle size smaller than 300 nm and a preparation method of the monodisperse spherical particle dysprosium oxide. The preparation method comprises the following steps: S1, a precipitate preparation process: a, preparing a dysprosium chloride-PEG mixed solution; preparing a urea solution; b, adding the dysprosium chloride-PEG mixed solution into a urea solution to obtain a primary material A mixed solution; c, heating the primary material A mixed solution in an electric furnace, keeping the temperature constant, and adjusting the pH value to obtain a precipitate A; d, aging the precipitate, discarding mother liquor, washing, and carrying out suction filtration to obtain a precipitate B; s2, a calcining process: a, putting the precipitate into a crucible, and opening a cover; b, putting the crucible into a muffle furnace for calcining, and calcining in three stages in a stepped temperature control manner; and S3, an ultrasonic process. Realizing lt; successful research and development of 300nm submicron particle rare earth dysprosium oxide not only is a size breakthrough, but also monodispersity means that the particles are highly uniform in size, morphology and composition, and the rare earth dysprosium oxide has good application prospects in the fields of catalysis, biomedicine, magnetic materials and the like.

The invention provides a core-shell microsphere for feed detoxification and a preparation method and application thereof.The core-shell microsphere comprises a sclerotium layer, a magnetic shell layer and a catalytic layer from inside to outside, and the sclerotium layer is composed of bacillus licheniformis and lactobacillus rhamnosus composite flora and a chitosan-sodium tripolyphosphate semipermeable membrane wrapping thalli; the magnetic shell layer is a Fe3O4 nano-particle coating, and the catalytic layer is a porous Mn-Ce-O shell. The microspheres have the double functions of biodegradation and chemical catalysis, the internal flora can degrade various toxins, the external catalytic layer efficiently decomposes stubborn toxins, the magnetic layer realizes rapid magnetic separation and recovery, and the microspheres are suitable for removing mycotoxins from feed raw materials such as corn and soybean meal.

The invention provides a core-shell structure powder preparation method which comprises the following steps: in a reaction chamber in an inert gas atmosphere, melting a metal raw material by using plasma jet, and crushing the molten metal raw material into metal powder which is a metal core of a core-shell structure. And meanwhile, precursor gas is introduced into the reaction chamber, so that the precursor gas is cracked under the combined action of high-energy plasma, high temperature, metal surface catalysis and the like and is recombined into a deposition layer on the surface of the metal core, and the core-shell structure powder with the metal core inside and the deposition layer outside is obtained at the moment. According to the core-shell structure powder preparation method provided by the invention, the gas is used as a precursor material, and under the combined action of the high-energy plasma and the high-temperature metal, the precursor gas can immediately complete cracking deposition of the shell material while melting and crushing the metal raw material through plasma jet, so that the deposition efficiency is high; and in addition, the gaseous precursor is relatively high in purity, so that the metal powder can be effectively prevented from being oxidized.

The present application relates to the technical field of plasma catalysis, and particularly relates to a method for catalytically converting methane and water into methanol and hydrogen under plasma conditions, a device used and a catalyst used. The bubbling-fluidized plasma reactor of the present application is formed by connecting a bubbling corona discharge plasma reactor at the lower part and a fluidized bed dielectric barrier discharge reactor at the upper part in series, and is filled with a catalyst in a discharge channel. Methane mixed with argon is preheated and then enters a gas bubbling column from a raw material inlet. A corona discharge is formed in the gas bubbles by a bubbling tip to generate plasma, so that the methane-water is preliminarily converted in cooperation. The gas after the preliminary conversion is introduced into the discharge channel to react under the action of the catalyst, and hydrogen and methanol are obtained by conversion.

The invention discloses silicon dioxide modified carbonyl iron powder as well as a preparation method and application thereof. According to the modified material, micron-sized carbonyl iron powder serves as a core, the surface of the modified material is coated with a nano-sized silicon dioxide layer through an improved Stober method, a core-shell structure is formed, the thermal stability and corrosion resistance of the carbonyl iron powder are remarkably improved, and the initial oxidation temperature of the carbonyl iron powder is not lower than 300 DEG C and is increased by at least 50 DEG C compared with an unmodified product. The preparation method comprises the steps of dispersion, mixed catalysis, coating reaction and post-treatment, and is simple in process and high in controllability. The invention further provides application of the modified carbonyl iron powder in an epoxy resin-based anticorrosive coating, when the filling amount is 0.1-2.0% (preferably 1.00%), the coating shows excellent anticorrosive performance in a 3.5 wt% NaCl solution, the low-frequency impedance modulus value is not lower than 7.0 * 10 < 5 > omega.cm < 2 >, and the corrosion current density is not higher than 2.15 * 10 <-8 > A / cm < 2 >. The method effectively solves the problems that the carbonyl iron powder is easy to oxidize and agglomerate and poor in corrosion resistance, and is suitable for the high-performance anti-corrosion and wave-absorbing integrated coating.