404 results about "Complex oxide" patented technology

A method for producing a pyrochlore-type oxide including, in the composition, a plurality of cations including an alkali metal cation, the method comprising: a mixing step (S10, S20) for mixing a plurality of raw materials each containing a plurality of cations; and a heating step (S11, S21) for heating the mixture containing the plurality of raw materials at a prescribed temperature by using a liquid phase method to generate a composite oxide including, in the composition, at least an alkali metal cation and having a corundum structure.

Provided is a negative thermal expansion material having excellent negative thermal expansion properties and exhibiting a gradual volume decrease with increasing temperature compared with the conventional zinc-phosphorus complex oxide Zn2P2O7 in a temperature range of 100-150°C.　 The negative thermal expansion material is characterized by comprising a zinc-phosphorus complex oxide represented by general formula (1). (1): ZnxCayMpPzOt (In the formula, M represents one or more metal elements selected from among Mg, Zn, Cu, Fe, Cr, Mn, Ni, V, Li, Al, B, Na, K, F, Cl, Br, I, Sr, Ba, Ti, Zr, Hf, Nb, Ta, Y, Yb, Si, S, W, Mo, Co, Bi, Te, Pb, Ag, Cd, In, Sn, Sb, Te, Ga, Ge, La, Ce, Nd, Sm, Eu, Tb, Dy, and Ho; 0<x<2.00; 0<y<2.00; 0≤p≤1.00; 1.70≤z≤2.30; and 6.00≤t≤8.00, provided that 1.70≤x+y+p≤2.30)

The invention provides a Ga-modified copper-based catalyst, a preparation method thereof and an application of the Ga-modified copper-based catalyst in preparation of methanol by hydrogenation of carbon dioxide, the Ga-modified copper-based catalyst comprises a carrier and an active component loaded on the carrier, the carrier is a Ga-modified TiO2-Al2O3 composite oxide, and the active component is a Cu oxide. The Ga-modified copper-based catalyst has the performance of catalyzing the reaction for preparing methanol through carbon dioxide hydrogenation, and methanol can be generated at high selectivity under the reaction conditions of low temperature and high pressure.

A positive electrode material coated with a composite oxide, a preparation method therefor, and the use thereof. The positive electrode material comprises an inner core and a coating layer on the surface of the inner core; the chemical general formula for the inner core is: NabNixFeyMnzM1-x-y-zO2, wherein 0.4 ≤ b ≤ 1.2, 0.10 ≤ x ≤ 0.50, 0.10 ≤ y ≤ 0.50, 0.10 ≤ z ≤ 0.50; the coating layer comprises a composite oxide, and the composite oxide comprises two or more metal elements. The positive electrode material is coated with the composite oxide, which significantly improves the conductivity and stability of the positive electrode material, reduces contact between the positive electrode material and an electrolyte, inhibits the occurrence of side reactions, and improves the cycle performance of the material.

The invention relates to the technical field of metal material coatings, in particular to a PVD composite coating and a preparation method thereof. The preparation method comprises the following steps: pretreating a metal matrix to obtain a pretreated matrix; carrying out magnetron sputtering deposition on the surface of the pretreated matrix by using a composite target material, carrying out plasma spraying and laser texturing for multiple times, and repeating the process to form a composite coating crude product containing a third rare earth doped high-entropy alloy coating; the composite coating crude product is subjected to post-treatment, and the composite coating is obtained; wherein the composite target material is AlCoCrFeNi-Y, and the composite oxide comprises aluminum oxide, titanium oxide and cerium oxide. According to the preparation method, the bonding strength, hardness and strength of the composite coating can be remarkably improved through magnetron sputtering deposition of the rare earth doped high-entropy alloy coating, plasma spraying formation of the composite ceramic coating with the gradient content, laser texturing treatment, alternate construction of multiple layers of coatings and the like in combination with elaborately selected materials with low expansion coefficients.

The invention relates to a catalyst for the hydrogen evolution reaction (HER) and methods for using the catalyst in a water-splitting process. A hydrogen evolution reaction (HER) electrocatalyst, and a method and use for preparing a HER electrocatalyst are disclosed. The method comprises the step of forming a two-dimensional electron gas (2DEG) interface at a heterojunction of at least one of two or more alternating layers of a first complex oxide and a second complex oxide, wherein the or each 2DEG interface exhibits a current density, corresponding to an intrinsic hydrogen evolution reaction (HER) activity that renders the 2DEG interface(s) suitable as an HER electrocatalyst for producing hydrogen (H2) from a water-based electrolyte by water electrolysis.

A method for extracting oxygen and metal from lunar-based mineral resources comprises the following steps: in a vacuum / inert gas atmosphere, lunar soil which is not subjected to mineral separation treatment is directly contained in a conductive current collector device and serves as a working cathode, and an inert oxygen evolution anode and electrolyte are matched to form a molten salt electrolytic bath; after the electrolysis reactor is heated to a preset operation temperature, electrifying electrolysis is carried out under the driving force of an external power supply, and oxygen is separated out by an anode and collected by a gas collecting device; after a preset electrolysis mechanism and electrolysis time, the cathode current collector is recycled from the electrolytic bath, and a metal product is obtained; and a new cathode current collector is replaced to realize continuous process operation. A traditional process for extracting oxygen and metal from lunar soil usually only focuses on preparation of metal or oxygen, and the oxygen and the metal cannot be prepared at the same time. According to the method, the lunar soil composite oxide raw material is subjected to solid-phase electrochemical reduction, the aim of synchronously producing oxygen and metal is achieved, and a new short-process metallurgical process route for preparing metal and oxygen through direct electrolysis of lunar soil without mineral separation treatment is achieved.

An exhaust gas purification catalyst comprising: an upstream catalyst provided on the upstream side in the flow direction of exhaust gas; and a downstream catalyst provided on the downstream side in the flow direction of exhaust gas, wherein the upstream catalyst has a base A and a layer a1 provided on the base A, the downstream catalyst has a base B and a layer b1 provided on the base B, the layer a1 contains Rh and a Ce-Zr-Al complex oxide, the layer b1 contains Rh and a Ce-Zr complex oxide, the contained amount of Al calculated as Al2O3 in the Ce-Zr-Al complex oxide contained in the layer a1 is at least 30 mass% with respect to the mass of the Ce-Zr-Al complex oxide, the contained amount of the Ce-Zr-Al complex oxide contained in the layer a1 is at least 50 mass% with respect to the mass of the layer a1, and the layer b1 does not contain Al or, if the layer b1 contains Al, the contained amount of Al calculated as Al2O3 in the layer b1 is at most 30 mass% with respect to the mass of the layer b1.

A positive electrode mixture layer in this secondary battery contains a first positive electrode active material having a particle fracture strength of 90 MPa or less and a second positive electrode active material having a particle fracture strength of 110 MPa or greater. The first positive electrode active material is a lithium transition metal complex oxide that contains Ni and Mn, and has a Co content ratio of 1 mol % or less. The second positive electrode active material is a lithium transition metal complex oxide that contains Ni and Co, and has a Co content ratio of 3 mol % or greater. Regarding the positive electrode mixture layer, the content of the first positive active material is at least 5 mass % but less than 50 mass % with respect to the combined mass of the first positive electrode active material and the second positive electrode active material.

A spinel-structured multi-component composite oxide catalyst comprises active metals and base metals, and the active metals are 2-5 of iron, cobalt, nickel, ruthenium, molybdenum, manganese, platinum, palladium and chromium; the base metal is a composite metal oxide formed by two or three mixed metals of magnesium, aluminum, zinc, manganese, iron, cobalt, titanium, chromium and nickel; the particle size of the active metal particles is 2-50 nanometers, more preferably 2-20 nanometers. The catalyst has the characteristics of high transition metal content, uniform active site distribution, small crystal grain, large specific surface area, sintering inhibition, good stability and the like, and high-magnification synthesis of carbon nanotube powder is realized by cracking hydrocarbon carbon source gas.

The invention discloses a spinel oxide catalyst derived from MOFs and a preparation method thereof, and belongs to a catalyst preparation technology, and the method comprises the following steps: firstly synthesizing an organic framework material of a metal, then introducing a precursor of another metal through an impregnation method, and then drying and roasting to obtain the spinel catalyst. The method is suitable for preparing any spinel type composite oxide, and the spinel type composite oxide catalyst prepared by the method has a high specific surface area and a strong synergistic effect among metal atoms, and can remarkably improve the molecular catalytic oxidation performance of atmospheric pollutants. The method is simple and feasible, and can be applied on a large scale.

The invention discloses a reinforced high-pressure flange composite material containing nano tungsten carbide and a preparation method thereof.The composite material comprises, by weight, 96.0%-98.3% of base material SAF2205 duplex stainless steel, the duplex stainless steel comprises 21.0%-23.0% of chromium, 4.5%-6.5% of nickel, 2.5%-3.5% of molybdenum, 0.18%-0.25% of nitrogen, 0.01%-0.03% of carbon and the balance iron; a reinforcing phase: 0.5-1.5% of nano tungsten carbide, the particle size of which is 50-100 nm; the substance combination comprises the following components in percentage by weight: (a) 0.3-0.5% of molybdenum disulfide (MoS2) nanosheets with the thickness of 5-20 nm; (b) 0.1-0.3% of graphite fluoride micro powder with a particle size of 1-3 [mu] m; (c) 0.3 to 0.6 percent of V2O5-B2O3 composite oxide, wherein the weight ratio of V2O5 to B2O3 is 3 to 2; (d) 0.2 to 0.5 percent of Y2O3 surface modified nano silver (Ag-Y2O3) composite powder, wherein the diameter of a silver core is 20 to 50nm, and the thickness of a Y2O3 shell layer is 5 to 10nm; (e) 0.3-0.7% of a graphene / zirconium oxide (G / ZrO2) nano composite material, the weight ratio of graphene to ZrO2 is 1: 2, and the particle size of ZrO2 is 15-30 nm; the material combination solves the problem of stress corrosion cracking sensitivity of the duplex stainless steel flange in a high-temperature and high-pressure corrosive medium by forming a multistage interface regulation and control network and a shell-core-shell multilayer structure system.

The invention discloses a preparation method and application of a microsphere ceramic particle flue gas denitration catalyst, the catalyst takes a composite oxide of copper oxide and silicon oxide as a carrier, platinum nanoparticles as an active component and vanadium oxide as a cocatalyst, and the catalyst is prepared by a combined method of electrochemical deposition, high-temperature roasting and impregnation loading. Based on the mass of the carrier, the mass percentage content of the active component is 1-3%, and the mass percentage content of the cocatalyst is 5-10%, and the catalyst synthesized by the method has excellent conversion rate and selectivity, can realize efficient removal of nitrogen oxides, and has high economic value and wide market application prospect.

A slurry composition of the present invention contains: particles of a complex oxide containing La and at least one element selected from the group consisting of Mo and W; and a dispersion medium. a central particle diameter of the particles is not greater than 800 nm, and a content of the particles is 0.1 to 10 mass %.

A positive electrode according to the invention is a positive electrode including a positive electrode active material layer formed on a positive electrode current collector, wherein the positive electrode active material layer includes lithium iron phosphate compound-based first positive electrode active material and a lithium nickel manganese cobalt complex oxide-based second positive electrode active material, wherein the second positive electrode active material is 10 wt% or less, based on the total weight of the first positive electrode active material and the second positive electrode active material, and the ratio (=B / A) of the average particle diameter (D50) B of the second positive electrode active material to the average particle diameter (D50) A of the first positive electrode active material is 3 or more. The positive electrode according to one embodiment of the present invention, due to the improved rolling performance, the loading amount of the positive electrode can be increased, and the thickness of the positive electrode active material layer can be significantly reduced through rolling, which has the effect of providing a high energy density lithium iron phosphate-based positive electrode.

The invention discloses a trimetallic spinel oxide / high-valence metal oxide composite OER electrocatalyst and a preparation method thereof. The method comprises the following steps: firstly, synthesizing trimetal LDH nanosheets with rich defects in one step through a colloid mill, then inserting high-valence transition metal oxyacid radical ions into LDH layers by utilizing an ion exchange method, and finally, enabling LDH to be topologically converted into a spinel structure by adopting a low-temperature thermal oxidation method and generating more defects at the same time, so as to prepare the composite oxide electrocatalyst. Based on the adjustable property of interlayer anions of layered double hydroxides, a nucleation crystallization isolation method, an ion exchange method and a thermal oxidation technology are combined, the composite oxide electrocatalyst with an ultrathin nanosheet structure and rich surface defects is prepared, and the composite oxide electrocatalyst has the OER catalytic performance far higher than that of precious metal.

To provide: a complex oxide having an improved OSC and containing a cerium element, a zirconium element, an aluminum element, and optionally a rare earth metal element other than the cerium element; and a method for producing the complex oxide.SOLUTION: The present invention provides a complex oxide containing a cerium element, a zirconium element, an aluminum element, and optionally a rare earth metal element other than the cerium element. Therein an OSC amount at 400°C per 1 g of CeO2 as measured by a CO-pulse method is 1470 μmol / g or more.SELECTED DRAWING: None

The invention belongs to the field of catalyst preparation, and particularly relates to a nickel-based anti-carbon-deposition catalyst for ethane dry reforming and a preparation method and application thereof.The nickel-based anti-carbon-deposition catalyst comprises a carrier and an active metal component loaded on the carrier, the carrier is cerium-zirconium composite oxide, and the active metal component is nickel-zirconium composite oxide. The active metal component is a combination of nickel and transition metal elements. The cerium-zirconium oxide carrier adopted by the invention has rich oxygen vacancies, can improve the reactant gas capture and carbon deposition resistance of the catalyst, and can improve the mechanical strength of the catalyst at the same time. The method is simple in process, free of pollution and capable of being produced and used on a large scale.

The invention provides a hierarchical porous molybdenum-bismuth composite metal oxide catalyst and a preparation method thereof, the general formula of the hierarchical porous molybdenum-bismuth composite metal oxide catalyst is Mo12Bi1. 5Fe1. 5Co5CexGdyK0. 5O / TiO2, 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 on the carrier, the carrier is hierarchical pore TiO2, and the composite metal oxide is a composite oxide of molybdenum bismuth iron cobalt potassium and at least two rare earth metals. The catalyst is prepared by a deposition-precipitation method. The prepared hierarchical porous molybdenum-bismuth composite metal oxide catalyst has a large specific surface area, contains at least two rare earth metals at the same time, promotes high dispersion of active components, has a synergistic effect among the rare earth metals, increases the number of active oxygen species, and further improves the selective oxidation product selectivity of the catalyst.

The invention discloses a preparation method of a complex oxide interface one-dimensional system. According to the method, a pulse laser deposition technology is utilized, based on a step structure of a substrate, a novel one-dimensional nano material of a complex oxide is prepared through a growth mode of flowing along a step, and the method comprises the steps that a material S is epitaxially grown on the substrate, the thickness of the material S is one step height, and the transverse width of the material S is L1; a material B is laterally and epitaxially grown on the substrate or the material S along the edge of the new step, the lateral width is L2, and the thickness is the height of one step; taking L1 + L2 as a period, and repeatedly growing for n periods; the steps are repeated, N repetitions are achieved in the longitudinal direction, and then preparation of the complex oxide novel interface one-dimensional system is achieved. The method disclosed by the invention develops a new material interface regulation and control way, can be popularized to other associated systems, and lays a physical foundation for research and development of all-oxide spinning electronic devices.

The invention aims to provide a negative thermal expansion material with excellent negative thermal expansion performance. The negative thermal expansion material according to the present invention is characterized by containing a copper-vanadium composite oxide powder represented by general formula (1) in which Al atoms are solid-solved, in the formula CuxMyVzOt (1), M represents a metal element having an atomic number of 11 or more other than Cu, V and Al, x represents 1.60 < = x < = 2.40, y represents 0.00 < = y < = 0.40, z represents 1.70 < = z < = 2.30, and t represents 6.00 < = t < = 9.00 (where 1.00 < = x + y < = 3.00), and in the case where the negative thermal expansion material contains the element M, x represents a metal element having an atomic number of 11 or more. The number of moles of Al atoms in terms of atoms > the number of moles of M atoms in terms of atoms.

The invention relates to a method for preparing methanol through hydrogenation of carbon dioxide. The method comprises the following steps: sequentially introducing raw material gas into a first fixed bed reactor filled with a catalyst, the interior of a membrane tube of a first membrane reactor, a second fixed bed reactor filled with a catalyst, the interior of a membrane tube of a second membrane reactor and a third fixed bed reactor filled with a catalyst; purging gas is respectively introduced into the exterior of the membrane tube of the first membrane reactor and the exterior of the membrane tube of the second membrane reactor; the catalyst comprises a metal oxide carrier and an active metal component, the active metal component is Pd, and the metal oxide carrier is an indium-zirconium composite oxide with an ordered mesoporous structure; the membrane tube of the first membrane reactor and the membrane tube of the second membrane reactor respectively comprise a membrane support body and a membrane functional layer covering the inner surface of the membrane support body, and the membrane functional layer is a molecular sieve membrane. The method provided by the invention has high catalytic activity and selectivity, and can significantly improve the conversion rate of carbon dioxide and the content of methanol in the product.

The application discloses high-temperature piezoelectric ceramics for high-power scenes and a preparation method thereof, and belongs to the technical field of piezoelectric ceramics. The high-temperature piezoelectric ceramic is Mn-doped lead zirconate titanate-based piezoelectric ceramic; the lead zirconate titanate-based piezoelectric ceramic is a three-phase solid solution of Pb(Yb 1 / 2 Nb 1 / 2 )O3, PbZrO3 and PbTiO3; and the doping mode of the Mn element is metal oxide MnO2 doping or composite oxide Pb(Mn 1 / 3 Nb 2 / 3 )O3 doping. The application solves the process problems existing in material industrialization by controlling the composition of the material, overcomes the problem that high piezoelectric performance and high Curie temperature and high mechanical quality factor are difficult to be compatible, and obtains high-power high-temperature piezoelectric ceramics with excellent comprehensive performance.

A rare earth ion doped complex oxide with Formula (I) (Ca1+xMgSi2Eu0025O6+x (x = 0.2, 0.4, 0.6, 0.8, 1.2, 1.4, 1.6, 1.8, 2.0)) or Formula (II) (Mg1-xCo3NiCuZnCexO8+x (x = 0.05, 0.1, 0.5, 1.0)). A method of preparing said rare earth ion doped complex oxide, and the use of said complex oxide in photoluminescence phosphor are also addressed. A method 5 of predicting photoluminescence emission characteristics of the complex oxide is further addressed.

To provide a transparent conductive film which is excellent in pen slide durability, a pen weight pressurization durability, and high definition, when being used in a touch panel.SOLUTION: There is provided a transparent conductive film, wherein a crystal particle size of a transparent conductive film of an indium-tin complex oxide is 10 to 100 nm, a degree of crystallization of the transparent conductive film of the indium-tin complex oxide is 20 to 80%, the transparent conductive film of the indium-tin complex oxide contains 0.5 to 10 mass% of tin oxide, thickness of the transparent conductive film of the indium-tin complex oxide is 10 to 30 nm, when three-dimensional surface roughness SRa of the transparent conductive film of the indium-tin complex oxide is represented by X, X is 1 to 100 nm, and when three-dimensional surface roughness SRa on a surface opposite to the side of the transparent conductive film on a transparent plastic film base material is represented by Y, (X3+Y3)1 / 3 is 140 nm or less.SELECTED DRAWING: None

To provide a novel composite oxide and a semiconductor device which has excellent electric characteristics and of which the reliability is high.SOLUTION: A composite oxide includes at least two regions 001 and 002. The region 001 contains In, Zn and an element M1 (the element M1 is one or more of Al, Ga, Si, B, Y, Ti, Fe, Ni, Ge, Zr, Mo, La, Ce, Nd, Hf, Ta, W, Mg, V, Be and Cu). The region 002 contains In, Zn and an element M2 (the element M2 is one or more of Al, Ga, Si, B, Y, Ti, Fe, Ni, Ge, Zr, Mo, La, Ce, Nd, Hf, Ta, W, Mg, V, Be and Cu). When the composite oxide is analyzed by energy dispersive X-ray spectroscopy, the element M1 in the region 001 is detected less than the element M2 in the region 002. A peripheral part of the region 001 is observed blurred by mapping analysis in the energy dispersive X-ray spectroscopy.SELECTED DRAWING: Figure 1

In a piezoelectric element in which a lower electrode, a piezoelectric layer formed of a perovskite-type complex oxide, and an upper electrode are laminated in a laminating direction, the upper electrode has a first hydrogen absorbing layer that absorbs hydrogen. The upper electrode of the piezoelectric element preferably has a second hydrogen absorbing layer different from the first hydrogen absorbing layer. In the piezoelectric element, the film thickness of the first hydrogen absorbing layer is preferably thicker than the film thickness of the second hydrogen absorbing layer in the laminating direction.

To provide a positive electrode active material including a lithium nickel-manganese complex oxide, in which the characteristics of high capacity and high energy density are secured while reducing the price of a positive electrode material, the side reaction with an electrolyte at high voltage is suppressed, and the high-voltage performance is improved, a positive electrode including this positive electrode active material, and a lithium secondary battery.SOLUTION: A positive electrode active material includes: a first positive electrode active material containing a lithium nickel-manganese complex oxide in which the content of nickel is 60 mol% or more relative to 100 mol% of the entire metals excluding lithium and in a mode of a secondary particle formed by aggregation of a plurality of primary particles, the average particle diameter (D50) of the secondary particle is 10 μm to 20 μm; a second positive electrode active material containing a lithium nickel-manganese complex oxide in which the content of nickel is 60 mol% or more relative to 100 mol% of the entire metals excluding lithium and in a monoparticulate mode, the average particle diameter (D50) of the monoparticle is 2 μm to 8 μm; and a third positive electrode active material in a particulate form containing a lithium transition metal phosphorus oxide.SELECTED DRAWING: Figure 1

Provided are: a nonaqueous electrolyte secondary battery positive electrode active material that has high crystallinity, that causes less amount of Mn deposition on a negative electrode, and that can form a secondary battery having excellent cycle characteristics; and a nonaqueous electrolyte secondary battery using the nonaqueous electrolyte secondary battery positive electrode active material. The nonaqueous electrolyte secondary battery positive electrode active material according to the present invention is formed of a lithium-manganese-nickel complex oxide including a spinel-type crystal structure, wherein the lithium-manganese-nickel complex oxide has a crystallite diameter not smaller than 1000 Å and is formed of primary particles that have a polyhedron shape having more than eight surfaces. The proportion of ungrown particles not having the polyhedron shape of the primary particles in the lithium-manganese-nickel complex oxide is preferably not higher than 5%.

The present invention relates to an Fe-Ni alloy consisting of C: 0.001 to 0.2 mass%, Si: 0.001 to 0.2 mass%, Mn: 0.005 to 0.7 mass%, Ni: 30.0 to 45.0 mass%, Cr: 0.3 mass% or less, Al: 0.001 to 0.1 mass%, Ti: 0.001 to 0.020 mass%, O: 0.007 mass% or less, Mg: 0.0030 mass% or less, N: 0.010 mass% or less, Ca: 0.0015 mass% or less, Na: 0.00005 to 0.001 mass%, the balance being Fe and unavoidable impurities, wherein non-metallic inclusions containing CaO-SiO2-Al2O3-MgO-MnO-Na2O-based complex oxides as essential components, and further containing one or more non-metallic inclusions of CaO, MgO, MgO·Al2O3, MnO·SiO2, and Na2O as optional components, wherein the number ratio of CaO-SiO2-Al2O3-MgO-MnO-Na2O inclusions is 40% or more in all non-metallic inclusions, thereby producing an Fe-Ni alloy having excellent surface properties.