923 results about "Composite oxide" patented technology

The invention discloses a multi-component composite oxide dispersion strengthening molybdenum alloy and a preparation method thereof, and relates to the technical field of refractory metal powder metallurgy preparation. The molybdenum alloy comprises a molybdenum matrix and a Y-X-O composite oxide nano precipitated phase dispersed and distributed in the molybdenum matrix. The molybdenum alloy comprises the following components in percentage by mass: 1%-2% of Y2O3, 0.3%-1.2% of an active element X, 96.5%-98.7% of molybdenum and inevitable impurities, wherein X is selected from one of Ti, Zr and Hf; the Y-X-O composite oxide nano precipitated phase and the molybdenum matrix form a coherent or semi-coherent interface, and the interface mismatch degree is less than or equal to 5%. The molybdenum alloy has excellent high-temperature strength and creep resistance, and can be applied to the high-temperature fields of nuclear industry, aerospace and the like.

The invention relates to a preparation method of a pectin-derived carbon-coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The method comprises the following steps: dropwise adding a tin tetrachloride solution and an acidified zinc oxide solution into a pectin solution to obtain a metal ion-pectin dispersion liquid; adding ammonia water to obtain a pectin precursor solution; freezing and solidifying with liquid nitrogen; and after freeze-drying, roasting for 3-5 hours to obtain the pectin derived carbon coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The reversible specific capacity of the obtained composite material reaches 1339 mA h g <-1 > after 100 cycles under the current density of 0.2 A g <-1 >.

The invention discloses modified biogas residue-based hydrothermal carbon, a preparation method thereof and a dry digestion method for kitchen waste, and belongs to the technical field of waste organic matter recycling. The preparation method comprises the following steps: soaking biogas residues in a phosphoric acid solution to obtain pretreated biogas residues; mixing the pretreated biogas residues, transition metal salt, biochar loaded with vitamin B12 and water with the mass being 8-15 times that of the pretreated biogas residues, and performing hydrothermal reaction for 1-4 hours under the conditions that the temperature is 180-250 DEG C and the pressure is 1.5-4 MPa to obtain a hydrothermal product; and activating the hydrothermal product for 1-2 hours under the protective atmosphere of 300-400 DEG C to obtain the modified biogas residue-based hydrothermal carbon. The surface Fe-Cu composite oxide sequentially catalyzes and oxidizes H2S into elemental sulfur and sulfate ions, the vitamin B12-loaded biochar can promote MA directional proliferation, the sulfate ions can competitively inhibit SRB substrate uptake, the quantity ratio of MA to SRB is increased, and the methane production efficiency is effectively improved.

The invention relates to an aerogel-derived ultralow-temperature water-sulfur poisoning-resistant flue gas denitration catalyst and a preparation method thereof, and belongs to the technical field of air pollution control and environment catalytic material frontier. CeMnNiOx composite oxide is used as an active component of the catalyst, a catalyst precursor gel with a three-dimensional network structure is formed through a sol-gel method, and then the hydrophobic aerogel derivative denitration catalyst with a high specific surface area, low density and a three-dimensional porous structure is obtained through aging, freeze drying and high-temperature heat treatment. The denitration efficiency of the catalyst can reach 90% or above at the temperature of 80-270 DEG C in a complex atmosphere containing 5-10% of water vapor and 50-100 ppm of SO2. The method is suitable for deep purification of NOx in ultralow-temperature and high-humidity SO2-containing complex flue gas after industrial desulfurization and dust removal.

The invention belongs to the technical field of desulfurization gas purification, and particularly relates to a desulfurizing agent and a preparation method thereof. The desulfurizing agent is an iron-zinc-calcium composite oxide material with a hierarchical porous structure, and the preparation method of the desulfurizing agent comprises the following steps: performing amination modification on xanthan gum, then mixing the modified xanthan gum with nano cellulose, and then preparing slurry with a metal salt solution containing Fe, Zn and Ca; performing two-way temperature gradient freezing casting and freeze drying to obtain a precursor; and finally, roasting and activating under programmed temperature control. According to the preparation method, nano-scale dispersion of active components is realized by virtue of strong coordination of aminated xanthan gum and metal ions, and a high-strength and through hierarchical pore framework is constructed by virtue of nanocellulose enhancement and freezing casting. The obtained desulfurizer has ultrahigh one-time sulfur capacity, high mechanical strength and excellent structural stability, is complete in form after being used, is convenient for resource recovery, and is suitable for efficient removal of hydrogen sulfide in industrial gases such as refinery gas.

The invention provides a micron-scale high-melting-point oxide sheet layer enhanced ultra-high-temperature ceramic-based anti-ablation composite coating and a preparation method thereof.The preparation method comprises the steps that ultra-high-temperature carbide / boride ceramic powder, silicide powder and high-melting-point metal oxide powder are mechanically mixed, and spraying mixed powder with uniform components is obtained; the mixed powder is sprayed on the surface of a base body in a plasma spraying mode, and the ultra-high-temperature ceramic-based anti-ablation composite coating containing a micron-scale oxide lamellar structure is obtained; the lamellar high-melting-point oxide phase is introduced into the ultrahigh-temperature ceramic-based composite silicide coating, so that the problem that the silicon-containing glass phase is easy to lose and splash under high-heat-flow scouring is effectively solved. The high-melting-point oxide sheet layer serves as a physical barrier, can effectively limit flowing of a silicon-containing glass liquid phase in the ablation process and allows gaseous oxidation products to escape at the same time, so that a firmly-attached composite oxide layer is formed, and the oxidation resistance and the anti-scouring and anti-stripping capacity of the coating are greatly improved.

This invention discloses a silver-cobalt composite oxide catalyst, its preparation method, and its application in the electrocatalytic reduction of nitrate to ammonia, relating to the field of electrochemical catalyst technology. The invention involves dissolving silver nitrate and cobalt nitrate hexahydrate in deionized water, stirring until completely dissolved, adding citric acid as a complexing agent, and continuing stirring to form a homogeneous and stable metal complex solution. The metal complex solution is continuously stirred under heating conditions to allow the solvent in the system to gradually evaporate, forming a viscous gel, which is then dried to obtain a catalyst precursor. The catalyst precursor is ground and placed in a high-temperature furnace for programmed temperature calcination in air, followed by cooling to room temperature to obtain the target catalyst. The preparation method of this invention is simple and controllable, with abundant and inexpensive raw materials, requiring no complex equipment or harsh reaction conditions, and is easy to scale up for industrial production. The obtained catalyst exhibits extremely high catalytic activity and selectivity for the electrocatalytic reduction of nitrate to ammonia, with a high ammonia yield.

The application relates to the technical field of power cables, and discloses a coal mine-used cross-linked polyethylene insulated power cable and a preparation method thereof. The coal mine-used cross-linked polyethylene insulated power cable comprises, from inside to outside, a cable core, an inner lining layer, an armoring layer and an outer sheath layer. The cable core comprises, from inside to outside, a conductor, a conductor shielding layer, a cross-linked polyethylene insulation layer and an insulation shielding layer. The outer sheath layer comprises the following components in parts by weight: 55-70 parts of polyvinyl chloride, 15-30 parts of thermoplastic polyurethane, 12-18 parts of a plasticizer, 0.3-0.5 parts of an antioxidant, 0.8-1.6 parts of a lubricant, 15-20 parts of a filler, 1-3 parts of maleic anhydride grafted polyethylene and 0.5-1.0 parts of a coupling agent. The filler comprises perlite loaded yttrium and tin composite oxides. The above technical scheme solves the problem of insufficient flame retardance of the coal mine-used cross-linked polyethylene insulated power cable in the prior art.

Reduction of initial resistance. [Solution] A positive electrode active material comprising a layered lithium transition metal composite oxide, wherein the volume-based particle size distribution of the positive electrode active material is 0.1

The invention belongs to the technical field of environmental catalytic materials, and particularly relates to a mesoporous Ni-Mn composite oxide catalyst, a preparation method and application of the mesoporous Ni-Mn composite oxide catalyst in NH3-SCR. The catalyst comprises the following components in percentage by mass: 6.2%-6.7% of NiO; 3.9%-14.4% of MnO2 (manganese dioxide); 4.3%-7% of CeO2; zrO2: 3.05% to 5%; an inorganic oxide carrier with a regular mesoporous structure: the balance of the mass of the catalyst; niO and MnO2 exist in the form of a Ni-Mn composite oxide; the CeO2 and the ZrO2 exist in the form of a CeO2-ZrO2 solid solution; the following relation is satisfied: n (NiO) / n (MnO2) = (0.5-2): 1; n (CeO2) / n (ZrO2) = 1: 1; and n (CeO2 + ZrO2) / n (NiO + MnO2) is equal to (0.2-0.6): 1.

The invention belongs to the technical field of enamel glaze, and particularly relates to enamel glaze based on transient template in-situ reaction and a preparation method and application thereof. The enamel glaze is prepared by mixing basic enamel glaze slip and a core-shell structure functional precursor, wherein the basic enamel glaze slip is water suspension prepared by mixing and grinding basic enamel frits and auxiliaries; the core-shell structure functional precursor is inorganic composite powder, and the original structure of the core-shell structure functional precursor is as follows: silicon nitride micron particles are used as a core, and a layer of Y-Zr-Ti composite oxide is coated on the surface as a shell. According to the invention, a real chemical bonding strong interface is realized, and a firm chemical bond is constructed in situ between a reinforced phase and a glass matrix by using a high-activity oxide shell layer as a solder in a final sintering stage. The problem that an interface is weak in traditional physical blending is fundamentally solved, and stress can be effectively transmitted from a matrix to a high-strength reinforced phase.

The invention relates to a flower-like MOFs-derived Mn-based composite oxide catalyst as well as a preparation method and application thereof.The flower-like MOFs-derived Mn-based composite oxide catalyst is prepared by taking Mn-based organic frameworks (MOFs) prepared by stirring at normal temperature as a precursor, forming flower-like MOFs by regulating and controlling self-assembly conditions, and cracking the MOFs by a three-section high-temperature pyrolysis method to obtain a dandelion-like Mn-based metal oxide. The oxide has a larger specific surface area and abundant active sites. The preparation method has the advantages that the MOFs skeleton structure obtained by stirring at normal temperature is used as an oxide precursor, more oxygen vacancies can be introduced by utilizing a three-section calcination method, the morphology of MOFs can be maintained, the specific surface area is high, more surface active sites are exposed, the oxidation-reduction performance is improved, and the preparation method is simple and convenient to operate. The bimetallic composite oxide is ensured to have more efficient and stable toluene removal performance at low temperature, and the catalyst is environment-friendly and has a wide industrial prospect.

A disclosed positive electrode is a positive electrode for a nonaqueous electrolyte secondary battery. The positive electrode includes a positive electrode current collector and a positive electrode mixture layer disposed on the positive electrode current collector. The positive electrode mixture layer contains active material particles having an average particle diameter less than 5 μm, a conductive material, a dispersant, and a binder. The active material particles include composite oxide particles and a surface modification layer formed on surfaces of the composite oxide particles and containing a boron compound. The composite oxide particles are particles of a lithium transition metal composite oxide. The conductive material includes a carbon material. The dispersant includes nitrile group-containing rubber. The binder includes a fluorine-containing polymer.

A positive electrode active material may include a first positive electrode active material comprising a first lithium transition metal composite oxide and having an average particle diameter D50 from 9 µm to 20 µm and may comprise a second positive electrode active material comprising a second lithium transition metal composite oxide and having an average particle diameter D50 from 1 µm to 8 µm. A particle diameter D20 of the positive electrode active material may be from 1.0 µm to 5.0 µm.

The invention provides a rare earth dispersion strengthened electrothermal alloy ribbon and a preparation method thereof. The rare earth dispersion strengthened electrothermal alloy ribbon comprises the following raw materials: chromium Cr, silicon Si, titanium Ti, aluminum Al, carbon C, yttrium Y, cerium Ce, Yb ytterbium, niobium Nb, vanadium V and iron Fe. The preparation method comprises the steps that the raw materials are subjected to smelting, forming, heat treatment and oxidation film treatment, a dispersed phase of rare earth oxides Y2O3, CeO2 and Yb2O3 and carbides NbC and VC is formed, an electrothermal alloy thin strip is subjected to triple dispersion strengthening, an Al2O3 + Cr2O3 + Nb2O5 + V2O5 + Yb2O3 composite oxidation film is formed on the surface of the thin strip, and finally the electrothermal alloy thin strip with thermal shock resistance and oxidation film stability is prepared.

The present invention pertains to lithium-nickel-manganese composite oxide particles are for use in a positive electrode active material for a lithium-ion secondary battery, and the lithium-nickel-manganese composite oxide particles include secondary particles formed by the aggregation of primary particles containing a lithium-nickel-manganese composite oxide having a hexagonal crystal structure with a layered structure. The secondary particles each have a hollow structure including an outer shell portion and a hollow portion formed inside the outer shell portion. The lithium-nickel-manganese composite oxide particles include, as 20% or more of the total number of the secondary particles, through‑hole-containing secondary particles that each have a through‑hole which has an average diameter of 20 nm or more and penetrates the outer shell portion from the outside of the outer shell portion to the hollow portion.

The present disclosure provides a positive electrode active material for a lithium ion secondary battery having a large initial discharge capacity. A positive electrode active material for a lithium ion secondary battery includes a lithium transition metal composite oxide. The lithium transition metal composite oxide has a layered structure. The layered structure is formed by alternately laminating lithium layers and transition metal layers. The transition metal layer contains at least nickel. The layered structure satisfies the relationship of 1.20 < = dLi / dTM < = 1.25. And "dLi" represents the interlayer distance of the lithium layers in the layered structure. And "dNi" represents the interlayer distance of the transition metal layers in the layered structure.

This invention relates to a method for preparing ultra-pure smelting of high-strength and high-toughness special steel at ultra-low temperatures. The chemical composition (wt%) is controlled as follows: C≤0.01%, Si≤0.05%, Mn≤0.05%, S≤0.005%, P≤0.005%, Ni: 17.5~18.5%, Co: 8.0~9.0%, Mo: 3.0~3.8%, Al: 0.05~0.15%, Ti: 0.20~0.35%, H≤1.0 ppm, O≤16 ppm, N≤15 ppm, with the balance being Fe and other unavoidable impurities. Core Technology: A five-element synthetic slag system of CaO-SiO2-Al2O3-MgO-CaF2 is introduced during the VIM stage. Utilizing the high-speed directional solidification effect of VAR steady-state remelting, and through matching the smelting environment and cooling rate, the coarse, brittle titanium sulfide phase is transformed into finely dispersed Al-Mg-Ti-S-O multiphase composite oxides. This achieves composite modification of inclusions and reduces their number density from 45 inclusions / mm². 2 Reduced to 8.5 pieces / mm 2 It effectively eliminates the hazards of large particles >4μm. The average grain diameter of the original austenite is refined from 42.37μm to 26.38μm, the elongation of the material reaches 21.06%, and the impact energy is as high as 143.63J, significantly improving the resistance to brittle fracture and possessing extremely high engineering application value.

A positive electrode active material for a nonaqueous electrolyte secondary battery according to one embodiment of the present invention contains Ca, Sr, Pa, and a lithium transition metal composite oxide that contains 65 mol% or more of Ni and assumes the form of secondary particles formed by aggregation of primary particles. The ratio ICa_OUT / ICa_IN of the normalized intensity ICa_OUT of Ca on the surface of the secondary particles to the normalized intensity ICa_IN of Ca inside the secondary particles is 2 to 7, the ratio ISr_OUT / ISr_IN of the normalized intensity ISr_IN of Sr on the surface of the secondary particles to the normalized intensity ISr_IN of Sr inside the secondary particles is 2 to 7, and the Gini coefficient of PO3- inside the secondary particles is 0.6 or less.

A positive electrode active material, a method for preparing the positive electrode active material, and a rechargeable lithium battery including the positive electrode active material are disclosed. The method for preparing a positive electrode active material may include pulverizing a carbon-based raw material to prepare carbon-based fine powder, mixing a lithium metal composite oxide and the carbon-based fine powder to prepare a mixed powder, and applying rotation to the mixed powder to form or provide a carbon-based coating layer on a particle surface of the lithium metal composite oxide. The average particle diameter of the carbon-based fine powder may be about 10 nm to about 100 nm. The applying of the rotation may include applying rotation of about 1,000 rpm to about 6,000 rpm for about 2 minutes to about 10 minutes.

Disclosed are positive electrodes, rechargeable lithium batteries including the positive electrode, and methods of manufacturing the positive electrode. The positive electrode includes a current collector and a positive electrode active material layer on the current collector. The positive electrode active material layer comprises a first positive electrode active material that comprises lithium-nickel-based composite oxide and has a bare form without a carbon coating on a surface thereof, a second positive electrode active material that comprises lithium-nickel-based composite oxide and has a core and a carbon coating layer on the core, a conductive material that comprises a carbon-based material, and a binder.

The invention relates to the technical field of denitration catalysts, and discloses a composite oxide catalyst and a preparation method thereof. The preparation method of the composite oxide catalyst comprises the following steps: mixing a manganese salt, a cobalt salt and deionized water, and carrying out a first precipitation reaction to obtain a first mixture; cerium salt and the first mixture are mixed and subjected to a second precipitation reaction, and a second mixture is obtained; sequentially drying and sintering the second mixture to obtain a composite oxide catalyst; wherein the molar ratio of the manganese element in the manganese salt to the cobalt element in the cobalt salt is (1.5-3): 1, preferably (1.9-2.1): 1. The preparation process of the composite oxide catalyst is simple, raw material loss is not caused, and the composite oxide catalyst prepared by the method has excellent denitration performance under a low-temperature condition.

This invention discloses a supported zirconium-based catalyst, its preparation method, and its application. It includes a zirconium-based support and a noble metal supported on the zirconium-based support. The zirconium-based support includes one or more of a zirconium-based composite oxide support and a zirconium-based metal-organic framework material. The zirconium-based composite oxide support includes a composite of zirconium oxide and other oxides, and the other oxides include oxides of one or more elements selected from Si, P, Ce, and Mg. The above-mentioned supported zirconium-based catalyst increases the interaction between the supported noble metal and the support by introducing Si, P, Ce, or Mg into the zirconium-based support to adjust the electron cloud density or oxygen vacancy concentration of the zirconium-based support. By using a zirconium-based metal-organic framework material with regular channels to support the noble metal, reactants and products can diffuse relatively quickly and smoothly, thereby avoiding excessive side reactions and carbon deposition caused by excessive retention of reaction intermediates or products.

The invention discloses a process method for continuous synthesis of MMA (methyl methacrylate) in a Mo-Bi-Fe multi-metal oxide catalyst system by taking isobutene as a unique C4 raw material. The method comprises the following steps: firstly, carrying out selective oxidation on isobutene into methylacrolein on a Mo-Bi-Fe catalyst under the conditions that the temperature is 320-360 DEG C and the pressure is 0.10-0.25 MPa (absolute pressure) by combining segmented oxygen supply with steam coverage regulation and control and cooperating with molten salt isothermal heat exchange; then selectively oxidizing methylacrolein into methacrylic acid on a Mo-V-(Te / Nb / W / P) composite oxide catalyst under the conditions that the temperature is 260-290 DEG C and the pressure is 0.10-0.25 MPa (absolute pressure) through matching of axial temperature partitioning and segmented oxygen feeding; and in a continuous esterification system in which reactive distillation and pervaporation or membrane distillation are coupled, performing esterification and continuous water removal under the conditions that the temperature of a tower kettle is 65-85 DEG C and the pressure in the tower is 0.08-0.15 MPa (absolute pressure) by taking strong-acid cation exchange resin as a catalyst, so as to obtain an MMA finished product. According to the method, high selectivity and low chromaticity are realized under industrial load, the MMA purity is greater than or equal to 99.90 wt%, and the water content is less than or equal to 30ppm.

A positive electrode active material for a lithium secondary battery includes lithium-transition metal composite oxide particles having a grain size of less than 300 nm as measured by XRD analysis and an XRD peak intensity ratio of 7% or more. The present invention provides a lithium secondary battery having improved life performance and output performance by controlling the grain size and XRD peak intensity ratio of lithium-transition metal composite oxide particles.

The present application relates to the technical field of reverse water gas shift reaction, and discloses a preparation method of a catalyst for reverse water gas shift reaction, comprising the following steps: weighing magnesium nitrate and zinc acetate, so that the molar ratio of Mg atoms to Zn atoms is 1:1 to 1:10 or 3:1 to 10:1; dissolving the weighed magnesium nitrate and zinc acetate in water, adding urea, stirring and uniformly mixing at room temperature, and then increasing the temperature and stirring to promote the co-precipitation of metal ions; and obtaining the MgO-ZnO composite oxide catalyst by centrifugation, washing, drying and calcination of the obtained precipitate. The MgO-ZnO composite oxide catalyst is prepared by adopting the urea uniform precipitation method, using magnesium nitrate and zinc acetate as raw materials, and precisely controlling the molar ratio of Mg to Zn.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The application provides a multi-level hole molybdenum-bismuth composite metal oxide catalyst and a preparation method thereof. 12 Bi 1.5 Fe 1.5 Co5Ce x Gd y K 0.5 O / TiO2, wherein 0 < x <= 1.2 and 0 < y <= 0.3. The catalyst comprises a carrier and a composite metal oxide, the composite metal oxide is dispersed in the carrier, the carrier is a multi-level hole TiO2, and the composite metal oxide is a composite oxide of molybdenum-bismuth-iron-cobalt-potassium and at least two kinds of rare earth metals. The catalyst is prepared by a deposition precipitation method. The multi-level hole molybdenum-bismuth composite metal oxide catalyst prepared by the application has a large specific surface area and contains at least two kinds of rare earth metals, which promotes high dispersion of active components, a synergistic effect between the rare earth metals, an increase in the number of active oxygen species and an increase in the selectivity of the catalyst for selective oxidation products.

To provide a method for producing coated particles that, when used as a positive electrode active material for non-aqueous electrolyte secondary batteries, including lithium-ion secondary batteries, result in non-aqueous electrolyte secondary batteries exhibiting excellent charge / discharge capacity, electrical resistance, and cycle characteristics. [Solution] The manufacturing method according to the present disclosure comprises an addition step of adding a boron-containing additive compound to a lithium metal composite oxide to obtain a mixture, and a heat treatment step of applying heat treatment to the mixture to obtain coated particles, wherein in the heat treatment step, the sulfate ion concentration in the mixture before heat treatment is 1200 ppm or more and 5000 ppm or less, and the amount of sulfate ions relative to the amount of boron (SO4 / B) is 0.1 (mol / mol) or more and 1.0 (mol / mol) or less.

The application discloses a composite metal catalyst for catalytic degradation of VOCs at low temperature and a preparation method thereof, and belongs to the field of environmental protection catalysis technology. The composite metal catalyst comprises the following components in percentage by weight: 5-25% of a multi-component composite metal oxide, 65-90% of modified mesoporous zeolite, 2-6% of a composite additive, and 1-3% of a high-temperature-resistant binder. The multi-component composite metal oxide is a copper / manganese / cerium / zirconium quaternary composite oxide, and the molar ratio of copper, manganese, cerium and zirconium is 1:(0.8-1.2):(0.5-0.8):(0.2-0.5). The modified mesoporous zeolite is ZSM-5 mesoporous zeolite which is modified by rare earth ions and an amphoteric surfactant. The application adopts the copper / manganese / cerium / zirconium quaternary composite metal oxide as an active component, the introduction of cerium and zirconium forms a solid solution structure, greatly improves the oxygen storage capacity and the redox performance of the active component, and the synergistic effect of copper and manganese and cerium and zirconium significantly reduces the oxidation and decomposition temperature of VOCs.