20 results about "Solution combustion" patented technology

The invention discloses a high-entropy perovskite catalytic material and a preparation method and application thereof, and belongs to the technical field of catalysts.The preparation method comprises the steps that soluble La < 3 + > salt, soluble Co < 2 + > salt, soluble Cu < 2 + > salt, soluble Fe < 3 + > salt, soluble Mn < 2 + > salt and a soluble X ion source (X is Ga, Zn or Zr) serve as raw materials, a complexing agent and water are added to form a mixed solution, a head product is obtained through a solution combustion method, and the high-entropy perovskite catalytic material is obtained through calcination. The chemical formula of the high-entropy perovskite catalytic material is La (CoaCubFecMndXe) O3. The high-entropy perovskite catalytic material provided by the invention has excellent thermal stability, and can still keep good catalytic activity and excellent catalytic stability at high temperature. When the high-entropy perovskite catalytic material prepared by the method is used as a catalyst for CO2 hydrogenation to prepare ethanol, the high-entropy perovskite catalytic material has excellent ethanol selectivity.

Disclosed is a method for preparing a platinum-based alloy catalyst using a solution combustion synthesis method, as characterized in that a metal which forms an alloy together with platinum is first loaded on a support and then platinum is loaded thereon.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium manganese iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the steps that a manganese source, an iron source and organic fuel are dissolved in a solvent and evenly mixed to obtain a mixed solution, and a self-propagating reaction is initiated through a solution combustion synthesis method; and after the reaction is finished, obtaining the ferromanganese composite oxide precursor with a three-dimensional porous spongy microstructure. The core advantage of the invention is that the three-dimensional porous spongy precursor skeleton is directly constructed in situ without depending on any additional template. The authigenic porous structure endows the precursor with a huge specific surface area and an interpenetrating pore channel network.

The present invention relates to a process for fabricating an electrochemical device based on praseodymium-doped nickel-ferrite nanoparticles and an electrochemical device thereof. The nickel ferrites are synthesized using solution combustion method, with praseodymium doping concentrations varying from 0 to 0.02. The prepared nanoparticles are characterized for thorough analysis of their structural, morphological, and electrochemical properties, wherein a three-electrode system is developed for evaluation of electrochemical performance of the prepared nanoparticles. The results showed that optimal Pr-doping enhanced both the electrical conductivity and charge storage capacity of the material, wherein the sample with 0.01 Pr-doping (NP-3) exhibited the highest specific capacitance of 69.2 F / g at a current density of 0.1 A / g, with a low charge transfer resistance of 0.30 Ω, making it suitable for energy storage devices.

The application belongs to the technical field of materials, and discloses a non-noble metal catalyst for biomass hydrogenation reaction, and a preparation method thereof, which comprises the following steps: adding A fuel and B metal salt into distilled water, heating, stirring and dissolving, and obtaining a gel along with water evaporation; placing the gel into a high-temperature device, and obtaining metal oxide powder with a spinel structure through a combustion reaction; and reducing the metal oxide powder, thereby obtaining the catalyst. The preparation method of the catalyst uses nitrate or acetate of the non-noble metal B as raw material, and A fuel is chelated with metal ions as a ligand during mixing and stirring, and uniformly disperses the metal ions, and is oxidized by the metal salt as fuel during the solution combustion synthesis, releases heat, decomposes to generate gas, and brings abundant mesopores to the obtained spinel oxide. The raw material is low in cost, green and environment-friendly, the preparation process is simple, the period is short, and the catalyst has great industrial application potential.

The application provides a method for topological transformation synthesis of high-entropy hydroxyl oxide nanosheets, and belongs to the technical field of inorganic materials, and comprises the following steps: 1) component design: Ca2Fe2O5 brown iron ore type oxide is used as a matrix material for element doping; 2) combustion synthesis of a precursor: a low-temperature solution combustion synthesis method is used to in-situ composite the raw material of step 1), and brown iron ore type oxide powder rich in ordered oxygen vacancies is prepared by burning the obtained powder; 3) structure reconstruction: the brown iron ore type oxide powder rich in ordered oxygen vacancies obtained in step 2) is subjected to high-energy ultrasonic activation to form a high-activity ultrathin structure nanosheet, and then an ion exchange reaction is carried out to obtain the high-entropy hydroxyl oxide nanosheet electrocatalyst. Compared with traditional NiFe and CoFe hydroxide / hydroxyl oxide, the nanosheet catalyst also shows higher anti-Fe leaching capacity in the OER process. The assembled zinc-air battery can stably operate for more than 225 hours at a low charging voltage.

The utility model relates to the technical field of cement production, and particularly discloses a cement raw material alkali content measuring device which comprises a flame photometer, a combustion chamber and a mounting bracket, one side of the combustion chamber is connected and provided with a liquefied gas bottle, one end of the combustion chamber is provided with a sample liquid suction assembly, and the sample liquid suction assembly comprises a liquid suction pipe and a liquid extraction pump; a bottle body supporting frame is arranged at the end, away from the flame photometer, of the mounting support, a smoke exhaust pipeline is arranged on one side of the combustion chamber, a smoke exhaust assembly used for exhausting combustion smoke in the combustion chamber is arranged in the smoke exhaust pipeline, and a smoke removal assembly used for conducting smoke removal treatment on the smoke exhaust pipeline is arranged at the outlet end of the smoke exhaust pipeline. The problems that smoke can be generated when a sample solution of a traditional cement raw material burns, and the smoke is diffused in a field environment, so that the environment is easily polluted, and even the body health of an operator is harmed are solved.

The invention discloses a W-(Co3O4 / RuO2) electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of hydrogen production by electrocatalytic water decomposition. The W-(Co3O4 / RuO2) electrocatalyst provided by the invention comprises a nanometer heterojunction structure formed by Co3O4 and RuO2, and tungsten atoms doped in the nanometer heterojunction structure. By adjusting doped elements, the electronic structures of tungsten, cobalt and ruthenium are effectively regulated and controlled, charge transfer of Co, Ru and W is promoted, and the covalence of Ru-O is inhibited, so that excessive oxidation of Ru is inhibited, excellent electro-catalytic oxygen evolution performance is given to the material, the number of catalytic active sites is greatly increased through the synergistic composite effect of nano heterojunctions formed by W atoms, Co3O4 and RuO2, and the catalytic activity of the material is improved. The atom utilization rate is effectively improved, the charge transmission path is optimized, the reaction kinetics is improved, and the water electrolysis oxygen evolution performance in the acid environment is greatly improved. Meanwhile, through the strategy of combining a solution combustion method and calcination, the process is simple and controllable, and wide application prospects are created for large-scale production.

The application selects biological cotton as a template, and adopts a simple solution combustion method to prepare nano-porous MgCo2O4 material. The method is to use magnesium nitrate and cobalt nitrate as an oxidant, organic fuel citric acid as a reducing agent, dissolve in a certain amount of deionized water to form a mixed solution, soak the biological cotton in the mixed solution for a certain time, and calcine the soaked cotton to obtain nano MgCo2O4 with a porous structure and carbon defects. The MgCo2O4 with porous carbon defects is prepared by one-step solution combustion method, which is fully ground and mixed with AP at a certain mass ratio, and the catalytic material with excellent catalytic performance for thermal decomposition of AP is obtained through differential thermal analysis. Not only the rapid progress of AP thermal decomposition reaction is effectively ensured, but also the apparent decomposition heat of AP thermal decomposition is further improved, which creates conditions for the continuous combustion of composite solid propellant.

The application provides a submicron Ti2Nb 10 O 29 , a preparation method and application thereof. The submicron Ti2Nb 10 O 29 , the preparation method comprises the following steps: S1, adding tetrabutyl titanate into a mixed solution of concentrated nitric acid and deionized water, stirring and dissolving to obtain a tetrabutyl titanate solution; S2, adding niobium oxalate and glycine into the tetrabutyl titanate solution, stirring and uniformly mixing to obtain a mixed solution; S3, transferring the mixed solution into a crucible, heating in a muffle furnace, and then performing annealing treatment to prepare the submicron Ti2Nb 10 O 29 . The solution combustion method for synthesizing the TNO in the application has smaller size compared with a traditional solid phase method, the submicron TNO has higher capacity, faster lithium ion diffusion coefficient and can significantly improve the lithium ion negative electrode rate performance compared with micron TNO synthesized by the traditional solid phase method.

This invention relates to the field of inorganic non-metallic materials technology, and particularly to a pentagonal high-entropy spinel material (MnFeCoNiMg) for SOFC linker protective coating, its preparation method, and its application. This invention is the first to employ a synergistic integrated approach of solution combustion synthesis and spark plasma sintering to prepare a high-entropy spinel protective coating for SOFC linkers. This achieves single-phase properties and microstructure control of the high-entropy spinel powder, ensuring the coating's compositional uniformity and high density. Furthermore, the coating forms a strong metallurgical bond with the ferritic stainless steel substrate, significantly extending the service life of the linker. This invention significantly enhances the coating's Cr diffusion resistance, high-temperature stability, and electrical conductivity through the synergistic effect of the high-entropy effect and lattice distortion of the pentagonal high-entropy spinel material, effectively suppressing high-temperature oxidation of the substrate and Cr volatilization and diffusion.

Fabrication of highly ordered metal oxide layers is performed by combining deposition of an oxidant-containing precursor, a pore-generating precursor, and a metal-containing precursor, depositing the precursor, and combustion of the precursor to form a metal oxide layer. In one example, high-quality porous aluminum oxide layers with controlled, 7 nm ordered porosity is demonstrated.Embodiments of the invention also include forming a polymer-filled porous metal oxide composite to serve as an improved capacitor dielectric.

The present disclosure relates broadly to a method of preparing a carbon hybrid nanomaterial. The method may comprise the step of subjecting a base, a carbon source and an acid to a solution combustion reaction to thereby form the carbon hybrid nanomaterial from the base, the carbon source and the acid. The disclosure also relates to a carbon hybrid nanomaterial prepared by the method and use of the carbon hybrid nanomaterial for promoting plant growth.

This invention provides a supported catalyst for VOCs decomposition and its preparation method. The catalyst comprises an alumina support and an active component supported on the alumina; the alumina is unsaturated coordinated alumina; and the alumina contains unsaturated coordinated Al. 3+ The content of the active component is 5-50%; the active component includes any one or a combination of at least two of platinum, palladium, ruthenium, or rhodium. This invention utilizes unsaturated coordinated alumina synthesized by solution combustion as a carrier. The interaction between the noble metal and the unsaturated coordinated alumina promotes the dispersion and anchoring of the noble metal, thereby improving the atomic efficiency and anti-sintering properties of the noble metal.

The invention relates to the field of rare earth metal application, in particular to a preparation method of CeO2 nanoparticles for chemical mechanical polishing. The invention discloses a solution combustion preparation method of CeO2 nanoparticles. By adjusting the variety of the Ce precursor, the variety of the organic additive and the reaction temperature, the primary grain size of the obtained CeO2 nano-particles is between 8 nm and 20 nm. The size of the CeO2 nanoparticles can be further increased to be between 30 nm and 100 nm through high-temperature heating. Furthermore, the CeO2 nanoparticles (1.0 wt%) obtained by the invention are prepared into slurry in water by using proline as a dispersing agent (1.0 wt%). Adjusting the pH value of the slurry to about 4.0 by using nitric acid; and the low-hardness ZF7 glass is subjected to chemical mechanical polishing. The preparation method of the CeO2 nanoparticles and the slurry is simple in process, low in cost, green and environment-friendly, and can be amplified on a large scale in factories.

The invention discloses preparation of high-entropy binding phase tungsten heavy alloy nano-powder through one-step hydrogen reduction and a sintering process, and belongs to the field of preparation of high-entropy binding phase tungsten heavy alloy materials. According to the preparation method, an oxide composite precursor substance with uniformly mixed metal elements is obtained through a solution combustion synthesis wet chemical method, reduction is carried out in a hydrogen atmosphere, and atomic-scale uniformly-mixed high-entropy binding phase tungsten heavy alloy nano powder is directly obtained; and finally, the high-entropy binding phase tungsten heavy alloy is prepared through pressureless sintering in a hydrogen environment and one-step hydrogen reduction. The process is simple and rapid, the high-entropy binding phase tungsten heavy alloy nano-powder can be prepared through one-step hydrogen reduction, the average particle size of the alloy composite powder is small, and the preparation time of the alloy powder is greatly shortened. By adopting a pressureless sintering technology, the density of a sintered body can be effectively improved, the liquid-phase sintering time is shortened, meanwhile, the sintering period is shortened, and excessive growth of tungsten crystal grains can be effectively prevented. The relative density of the sintered alloy is not lower than 97%, the tensile strength is not lower than 800 MPa, and the compressive strength is not lower than 1000 MPa.

The invention provides a preparation method of a copper oxide material rich in oxygen vacancies, the copper oxide material and application, and belongs to the technical field of material preparation. According to the preparation method of the copper oxide material rich in oxygen vacancies provided by the invention, a solution combustion method based on basic cupric carbonate and an external oxidant is adopted, and the accurately controlled protective atmosphere and calcination conditions are combined, so that the copper oxide material rich in oxygen vacancies with a specific electronic structure can be simply and efficiently constructed; the oxygen vacancy content and the specific surface area of the copper oxide material are remarkably improved, so that a large number of oxygen vacancies exist in the material and can be in full contact with oxygen molecules. Therefore, the copper oxide material prepared by the method has excellent oxygen molecule activation performance, oxygen molecules in the environment can be continuously activated through oxygen vacancies even under the dark condition, sufficient reactive oxygen species (ROS) can be generated, and efficient antibiosis in dual modes of illumination and darkness can be realized.

Solution combustion synthesis of amorphous metal-ionic conductor layers is provided using an ambient processing environment having 5% or less relative humidity. The resulting layers are ionic conductors having an ionic conductivity at least 10x their electronic conductivity, and preferably higher in some applications such as solid-state battery electrolytes. The amorphous nature of these layers is a significant advantage for battery applications, since the amorphous morphology inhibits dendrite formation.

The invention discloses a preparation method of nano oxide dispersion strengthened aluminum alloy powder, and relates to the technical field of powder metallurgy. The preparation method of the nano oxide dispersion strengthened aluminum alloy powder based on solution combustion synthesis comprises the following steps: preparing a solution of nitrate corresponding to the aluminum alloy powder and the oxide, and sintering and synthesizing the aluminum alloy powder and the nano oxide. A preparation method of nanometer oxide dispersion strengthening aluminum alloy powder comprises the steps that nitrate and organic fuel (such as CH6N4O) with a specific proportion are dissolved in deionized water to form a uniform oxidation-reduction solution, and a low-temperature self-propagating combustion reaction is initiated through microwave heating or an external heat source; the solution is sequentially subjected to low-temperature preheating, high-temperature concentration, foaming and severe combustion stages, metal ions and fuel are subjected to an oxidation-reduction reaction in the reaction process to generate nanoscale oxide particles (such as Al2O3), and meanwhile a large amount of gas is released to form a porous precursor; after combustion is finished, residual organic matters are removed through washing, drying and subsequent heat treatment, and finally the spherical or nearly spherical composite powder with the average particle size being 40-60 nm and the oxide volume fraction being controllable and evenly dispersed and distributed in an aluminum matrix is obtained. According to the method, carbon residues can be effectively inhibited and the deflagration phenomenon can be avoided by accurately regulating and controlling the oxidizing agent / fuel molar ratio and the combustion temperature, the fine size and high dispersity of nano oxide particles are ensured, and the obtained powder has good fluidity and high apparent density and is suitable for advanced forming processes such as metal additive manufacturing and powder metallurgy hot extrusion; and the high-temperature strength, the radiation resistance and the comprehensive mechanical property of the aluminum alloy are remarkably improved.

The invention discloses a method for preparing a platinum-based alloy catalyst by using a solution combustion synthesis method, which is characterized by comprising the following steps of: firstly, loading metal which forms an alloy with platinum onto a carrier, and then loading the platinum onto the carrier.