33 results about "Solution combustion" patented technology

The present invention generally relates to a method for synthesizing NiO / ZnO nanoparticles using solution combustion synthesis. The method comprising: dissolving 10 grams of Zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and 10 grams of Nickel(II) nitrate hexahydrate (Ni(NO3)2·6H2O) in 30 ml of double-distilled water to obtain a solution; adding at least one fuel selected from a group consisting of glucose, urea, and combinations thereof to the solution; stirring the solution for one hour to achieve homogeneity and transferring the homogeneous solution into a Pyrex dish; placing the dish inside a preheated muffle furnace at a temperature range of 440° C. to 460° C. and allowing the solution to boil, froth, and undergo exothermic combustion thereby retrieving the resulting fine nanoparticle powder upon completion of the reaction within 20 minutes; and cooling the synthesized powder to room temperature and grinding the powder to achieve a fine, uniform consistency, thereby forming NiO / ZnO nanoparticles.

The invention discloses a preparation method of a lithium iron phosphate positive electrode material, and belongs to the technical field of lithium ion batteries. A preparation method of a lithium iron phosphate positive electrode material comprises the following steps: S1, dissolving lithium nitrate, ferric nitrate and ammonium dihydrogen phosphate in water to form a solution; mixing polyvinylpyrrolidone with the solution to form a mixed solution; s2, heating the mixed solution for the first time to convert the mixed solution into homogeneous gel; s3, the homogeneous gel is heated for the second time, so that the homogeneous gel is burnt, and a mixture is obtained; uniformly mixing the mixture with a carbon source; and S4, calcining the mixture which is uniformly mixed with the carbon source in a reducing gas atmosphere to obtain lithium iron phosphate powder. The invention provides the lithium iron phosphate positive electrode material prepared by the solution combustion method which is high in efficiency, strong in universality, simple in process and low in cost.

The invention belongs to the technical field of high-entropy metal oxide nano powder materials, and particularly relates to a novel high-entropy metal oxide material for a negative electrode of a lithium ion battery and a preparation method of the novel high-entropy metal oxide material. On the basis of a solution combustion synthesis technology, a redox reaction system is constructed by adopting metal nitrate and organic fuel (such as citric acid, urea and the like), three spinel type high-entropy metal oxide nano powder materials with good electrochemical performance are provided and comprise (FexCoyNizCrmLin) 3O4, (FexCoyNizCrmLinZnq) 3O4 and (FexCoyNizCrmLinMgq) 3O4, the ratio of x: y: z: m: n: q is (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1), and the reversible specific capacity can reach 442.2-1190.3 mAhg <-1 > after 400 cycles under the current density of 500 And the rapid synthesis process significantly shortens the time required by traditional sintering, the obtained powder product also has the characteristics of narrow particle size distribution, high grain boundary purity, excellent chemical uniformity and the like, and an effective preparation way is provided for developing a high-performance electrode material.

The application belongs to the technical field of hydrogen production by ammonia decomposition, and discloses an electrically-assisted low-temperature hydrogen production method by ammonia decomposition, characterized by comprising the following steps: S1, preparing a reactor; the reactor comprises a quartz tube, two pieces of foam copper are installed in the quartz tube, a catalyst is filled between the two pieces of foam copper, each piece of foam copper is connected with a copper electrode, and two thermocouples are installed in the quartz tube and extend into the catalyst; S2, preparing the catalyst; S2.1, the catalyst is synthesized by a solution combustion method, and the precursors of the components of the catalyst are respectively Ni(NO3)2·6H2O, Co(NO3)2·6H2O, Fe(NO3)3·9H2O, Ce(NO3)3·6H2O and Zr(NO3)4·5H2O; and S3, introducing ammonia into the reactor to produce hydrogen; compared with the prior art, the application applies the electric field-assisted catalysis technology to the field of hydrogen production by ammonia decomposition, and develops a catalyst suitable for the electric field-assisted hydrogen production by ammonia decomposition.

The invention relates to a high-entropy oxide lithium ion battery negative electrode material and a preparation method thereof, a negative electrode plate and a battery, and belongs to the technical field of lithium ion battery negative electrode materials. The chemical formula of the high-entropy oxide lithium ion battery negative electrode material disclosed by the invention is (Co < 0.2 > Ni < 0.2 > Cu < 0.2 > Zn < 0.2 > Ti < 0.2 >) 3O4. The negative electrode material with excellent electrochemical performance is prepared, and in an electrochemical test, the material shows relatively high specific discharge capacity and relatively long cycle life, which indicates that the material has potential in lithium ion battery application and can meet the requirements on performance and cycle life; the high-entropy oxide material prepared by a solution combustion-sol-gel method is uniform and fine in particle size, and the size is about 100-200nm, so that the transmission of ions and electrons can be effectively accelerated, and the synthesized material has more excellent capacity and rate capability when being used for the negative electrode of the lithium ion battery.

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 discloses a low-expansion cordierite-mullite composite ceramic roller and a preparation method thereof, and relates to the technical field of ceramic rollers. Aluminum nitrate, magnesium nitrate and a silicon dioxide solution are used as raw materials, glycine is used as fuel, cordierite-mullite precursor micro-powder is prepared through a solution combustion synthesis method, then the cordierite-mullite precursor micro-powder, emery, kaolin and a binder are mixed to prepare a ceramic roller rod mixture, and the ceramic roller rod mixture is sintered to obtain the ceramic roller rod. Prefabricating the mixture into a green body through a forming process; and drying and sintering the green body in sequence to finally prepare the low-expansion cordierite-mullite composite ceramic roller which is low in thermal expansion coefficient, good in thermal conductivity, high in strength and strong in bending resistance. According to the preparation method, the firing temperature of the cordierite-mullite composite ceramic roller can be reduced, it is ensured that cordierite cannot be decomposed in the process of preparing the cordierite-mullite composite ceramic roller, and meanwhile it is ensured that a long-column-shaped mullite phase which is good in crystal grain development and distributed in a net-shaped and crossed mode is generated.

The present invention provides a preparation method of a boron and nitrogen co-doped CeFeO3 catalyst. The preparation process of this material is divided into two steps: solution combustion method and hydrogen reduction method. The preparation time is short and the operation process is simple. The prepared catalyst can efficiently activate N2 and CO2 simultaneously and has high activity and selectivity for electrocatalytic synthesis of urea.

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 utility model relates to the technical field of nano-particle liquid phase collecting devices, in particular to a device for preparing nano-powder through flame spray pyrolysis, which comprises a combustor, a flame combustion chamber, a precursor atomizer, a liquid phase collector and a suction mechanism. The precursor solution is subjected to high-temperature atomization and then is combusted through auxiliary flames to generate nano-particles and tail gas, the rear end of the flame combustion chamber is connected into a liquid phase collector, and the liquid phase collector is provided with a collecting liquid, a porous membrane substrate and a cooling device and used for filtering and collecting the nano-particles generated by combustion of the precursor solution; by means of a suction mechanism, tail gas containing nano-particles is subjected to micro-bubbling through a porous membrane matrix and then makes contact with collected liquid, then solid nano-particle flow is captured, and liquid-phase collection of nano-powder synthesized at the high temperature is achieved. According to the device, the problems of discontinuity, dissipation and low efficiency in the nano-particle trapping process are solved.

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 discloses a method for preparing an organic compound modified spinel catalyst and selectively catalytically reducing nitrogen oxides, which comprises the following steps of: preparing the catalyst by utilizing a solution combustion method, respectively weighing a certain amount of metal nitrate hydrate samples, putting the metal nitrate hydrate samples into a beaker, adding 100-150ml of deionized water, and uniformly stirring; the preparation method comprises the following steps: respectively adding four organic compounds into three beakers, adding a proper amount of deionized water, and stirring in a constant-temperature water bath at 75-85 DEG C until the organic compounds are completely mixed; and naming the sample without the organic compound as an additive-free sample as a blank control group. Respectively adding a metal nitrate solution into the sample solution, and continuously heating and stirring in the water bath for 1 hour; and transferring the sample into a muffle furnace, carrying out combustion reaction at 600-650 DEG C, cooling to room temperature, and taking out to obtain catalyst precursor powder. The method has a wide application range, meanwhile, the catalyst greatly improves the efficiency of selective catalytic reduction of nitric oxide, and the method has a good development prospect in the fields of purification of nitric oxide and realization of energy conservation and emission reduction.

The invention relates to the technical field of new energy batteries, in particular to a solution combustion synthesis method of LiMn2O4 and a lithium battery. The synthesis method comprises the following steps: preparing a precursor solution containing lithium salt and manganese salt; mixing the precursor solution with a compound playing a role in fuel and complexation, and adjusting the pH value to be greater than 7; stirring at a first preset temperature until black floccules appear; baking the floccules at a second preset temperature, and calcining at a third preset temperature; wherein the third preset temperature is higher than the second preset temperature, and the second preset temperature is lower than 300 DEG C; the synthesis method is simple and easy to operate, the energy consumption can be effectively reduced, the synthesis time is shortened, and meanwhile, the spinel type lithium manganate material prepared by the synthesis method also has the advantages of high purity and small particle size. The preparation raw materials of the positive electrode of the lithium battery comprise the LiMn2O4 material prepared by the synthesis method provided by the invention, and the lithium battery has good electrical properties.

The invention relates to a gas sensitive material for detecting diacetylmorphine, a gas sensor and a preparation method of the gas sensitive material, and the preparation method of the gas sensitive material comprises the following steps: taking zinc nitrate hexahydrate as a metal salt, and glycine and glucose as foaming raw materials, and foaming through a solution combustion method to obtain a ZnO nanosheet with a porous structure; the ZnO nanosheet is used as a gas sensitive material to prepare a gas sensor for detecting diacetylmorphine. The ZnO gas sensitive material provided by the embodiment of the invention has a relatively large specific surface area and a rich pore structure, effectively improves the gas sensitive performance of ZnO, and shows relatively high response to diacetylmorphine standard gas, ultrafast response capability and excellent stability.

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.

The present invention relates to a method for testing the temperature distribution of pool fire combustion in a confined space and estimating heat release. By using the method for testing the temperature distribution of pool fire combustion in a confined space and estimating heat release provided by the present invention, the temperature distribution at different positions in the combustion chamber can be obtained by designing a thermocouple tree, arranging the thermocouple tree according to the requirements of the central fire and the side wall fire in the combustion chamber, and setting temperature measurement points. At the same time, by using the method provided by the present invention, the heat flux density of the fuel solution during combustion in the combustion chamber can be measured using a radiation heat flux density meter and a convection heat flux density meter, and the heat release rate and combustion efficiency of the pool fire combustion in a confined space can be estimated. The present invention provides fire safety technical support for buildings such as factories, equipment rooms, and oil depots.

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.