198 results about "Complex oxide" patented technology

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.

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.

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.

Provided is a positive electrode active material for a non-aqueous electrolyte secondary battery, the positive electrode active material being capable of improving initial efficiency. The positive electrode active material for a nonaqueous electrolyte secondary battery, which is contained in the nonaqueous electrolyte secondary battery, contains a lithium transition metal composite oxide and a sulfonic acid compound that is present on the surface of the lithium transition metal composite oxide. The lithium transition metal composite oxide is secondary particles having a layered structure and containing 75 mol% or more of Ni with respect to the total number of moles of metal elements other than Li, and the Gini coefficient of SO3-on the surface of the secondary particles is 0.7 or less in the element concentration distribution in the cross section of the secondary particles using time-of-flight secondary ion mass spectrometry. (In the formula, A is a group 1 element or a group 2 element, R is a hydrocarbon group, and n is 1 or 2. )

The present invention relates to a catalytic article for treating an exhaust gas stream, the catalytic article comprising:-a substrate having an inlet end and an outlet end defining an axial length; -a first coating extending part or the entire axial length of the substrate, the first coating comprising a first catalyst comprising a vanadium component; -a second coating extending part or the entire axial length of the substrate, the second coating comprising a second catalyst comprising a noble metal component; and-a third coating extending part or the entire axial length of the substrate, the third coating comprising or consisting of an inorganic oxide selected from the group consisting of titanium oxide, silicon oxide, zirconium oxide, tungsten oxide, rare earth oxides such as lanthanum oxide and cerium oxide, any combination thereof or a composite oxide thereof, wherein the third coating is positioned as an intermediate layer between the first coating and the second coating over part or the entire axial length of the substrate. The invention also relates to a method and system for treating an exhaust stream containing nitrogen oxides with the catalytic article.

The invention relates to the technical field of precious metal extraction, in particular to a method for enriching platinum and palladium from a material containing high copper and sulfur. Oxidizing roasting; leaching with hydrochloric acid; copper precipitation treatment and ammonium chloride precipitation. In the oxidizing roasting stage, roasting is conducted in the oxygen atmosphere, the interference of sulfur on follow-up platinum and palladium enrichment is effectively reduced, a pretreated material and lead oxide are mixed according to the specific mass ratio, platinum and palladium elementary substances are converted into composite oxide easily dissolved in hydrochloric acid, and follow-up leaching of platinum and palladium is facilitated; in the hydrochloric acid leaching link, platinum, palladium and copper in the roasted product are fully dissolved, and the metal leaching rate is increased; during copper deposition treatment, iron powder is added according to the accurate molar ratio of the iron powder to copper ions, the copper ions are converted into copper slag precipitates, and efficient separation of copper, platinum and palladium is achieved; in the ammonium chloride precipitation step, ammonium chloride is accurately added according to the total molar weight of platinum and palladium in the filtrate, so that platinum and palladium are fully precipitated, and crude platinum and palladium products are obtained.

The application discloses a preparation method of super-high-entropy complex oxide powder material for thermal barrier coating and application thereof, and comprises the following steps: S1, uniformly dispersing a rare earth element source and a transition metal element source in deionized water, stirring and treating at 80 DEG C, then adding a complexing agent and a dispersing agent to obtain a mixture A; S2, adjusting the pH of the mixture A system to 4-5 by using ammonia water under stirring at 80 DEG C, continuously stirring and treating to form a gel, and drying to obtain a dry gel; S3, sintering the dry gel at 1400 DEG C for 2h to obtain the super-high-entropy complex oxide powder material. The application makes up the shortcomings of traditional thermal barrier coating YSZ material, can still maintain phase stability near 1500 DEG C, widens the thermal barrier coating material system to the super-high-entropy complex ceramic field, and the material has the characteristics of uniform element distribution, small and uniform powder particle size, high purity and the like, and the method has low requirement on equipment and is simple in synthesis method.

The invention provides a method for preparing methanol by hydrogenating carbon dioxide, which is characterized by comprising the following steps of: introducing raw material gas into the outer side of a membrane tube of a membrane reactor, and introducing purging gas into the inner side of the membrane tube of the membrane reactor; wherein the membrane tube of the membrane reactor comprises a membrane support body and a membrane functional layer covering the outer surface of the membrane support body; the membrane functional layer is a CHA molecular sieve membrane; the outer part of the membrane reaction cavity is filled with a catalyst; the catalyst comprises a metal oxide carrier and an active metal component loaded on the metal oxide carrier; the active metal component is Pd, and the metal oxide carrier is an indium-zirconium composite oxide with an ordered mesoporous structure. The membrane reactor is adopted to reinforce the CO2 hydrogenation methanol preparation reaction, so that water generated in the reaction process can be removed in time, and the methanol catalytic reaction is effectively promoted.

To provide a positive electrode active material for a lithium secondary battery with an excellent lifetime characteristic.SOLUTION: The present invention relates to a positive electrode active material, a manufacturing method for the same, a positive electrode including the same, and a lithium secondary battery including the positive electrode. More specifically, a lithium complex oxide and a coating layer on a surface of the lithium complex oxide are included. The positive electrode active material further includes sodium (Na) and sulfur (S). The mass fraction (S / Na) of S to Na described above is 1 to 3.SELECTED DRAWING: Figure 6

A hydrocarbon reforming catalyst used for forming a synthetic gas containing hydrogen and carbon monoxide from a hydrocarbon-based gas, the hydrocarbon reforming catalyst containing a complex oxide having a perovskite structure, wherein the complex oxide has a crystal phase containing SrZrO3 as a primary component and contains Ru.

The present invention relates to a positive electrode active material, a method of preparing the same, a positive electrode, and a rechargeable lithium battery. The method for preparing the positive electrode active material can include: (i) adding an aluminum raw material and sodium hydroxide to an aqueous (e.g., water-soluble) solvent to prepare a coating solution having a pH range of 12.5 to 14; (ii) adding core particles including a lithium-nickel-based complex oxide to the coating solution to prepare a first mixed solution; (iii) adding a cobalt raw material to the first mixed solution to prepare a second mixed solution; and (iv) drying and heat-treating the second mixed solution to obtain the positive electrode active material.

The invention relates to a high-durability fuel cell platinum-based catalyst and a preparation method thereof, the fuel cell platinum-based catalyst comprises a platinum-based catalyst and a metal oxide, and the metal oxide covers a part of the surface of the platinum-based catalyst; the metal oxide comprises an indium element. An indium oxide or an indium-containing composite oxide is modified on the surface of the platinum-based catalyst, and the oxide can be stably combined on the surface of the platinum-based catalyst to form epitaxial growth and form an interface site with the platinum catalyst, so that the fuel cell catalytic activity of the platinum catalyst can be promoted. Meanwhile, by controlling the reasonable coverage degree of the metal oxide on the surface of the platinum-based catalyst, the number of active sites exposed by the platinum catalyst is reserved, and the catalytic performance of the oxygen reduction reaction of the cathode of the fuel cell is improved to the maximum extent.

The invention provides an indium-lead composite oxide nanowire and a preparation method and application thereof, the atomic ratio of In to Pb in the nanowire is 0.1-10, and the diameter of the nanowire is 10-300 nm. In the invention, the two metal components indium and lead generate a synergistic component effect and are applied to the electrochemical reduction process, so that the adsorption and activation of the raw materials are greatly enhanced. Different valence states of lead and indium are mutually adjusted, and the electronic structure of the catalyst is optimized. Meanwhile, more active sites can be exposed by the nanowire structure, and the reaction kinetics process is effectively improved by the three-dimensionally arranged nanoscale structure.

The application discloses a nanometer spherical low-temperature rare earth-based denitration and carbon monoxide removal catalyst and a preparation method and application thereof. The catalyst takes alumina as a carrier, takes a composite oxide of manganese dioxide and cerium dioxide as an active component, and takes iron oxide as a cocatalyst. The catalyst synthesized by the method has the advantages of a large specific surface area, sufficient exposure of active sites and nanometer limitation, and can realize the denitration and carbon monoxide removal targets of low-temperature flue gas working conditions of non-electricity industries such as steel and chemical industries.

This invention relates to an additive for thermal desorption of polycyclic aromatic hydrocarbon (PAH) contaminated soil and its preparation method. It utilizes a composite oxide of manganese, rare earth metals, and transition metals to oxidize PAHs into low-carbon molecules during thermal desorption, achieving efficient removal, lowering the thermal desorption temperature, and saving energy consumption. The lower thermal desorption temperature reduces the loss of organic matter in the soil, facilitating the secondary use of the treated soil. The prepared composite oxide has a hollow spherical structure, which promotes sufficient contact and rapid reaction between PAHs and the composite oxide. The doping of transition metal elements into the manganese oxide and cerium oxide lattices creates oxygen vacancy defects, further enhancing the catalytic oxidation performance. Loading the manganese, rare earth metal, and transition metal composite oxide onto the surface of Fe3O4 improves its dispersion. Utilizing the magnetic properties of Fe3O4, the additive can be separated from the soil after desorption treatment, allowing for recycling.

The present invention pertains to infrared-absorbing particles containing a composite oxide containing an A1 element, which is one or more elements selected from H and alkali metals, an A2 element, which is one or more elements selected from Mg and alkaline earth metals, and a B element, which is one or more elements selected from V, Nb, and Ta, if the amount of substance of the element A1 contained in the composite oxide is expressed as x1, the amount of substance of the element A2 is expressed as x2, and the amount of substance of the element B is expressed as y, the relationships 0.002 < = (x1 + x2) / y < = 1.5, 0.001 < = x1 / y < = 1, and 0.001 < = x2 / y < = 1 are satisfied.

A spintronic device and an in-memory computing apparatus. The spintronic device comprises: a substrate; and a complex oxide layer and a magnetic tunnel junction structure, which are sequentially formed from bottom to top on the substrate, wherein there is a two-dimensional electron gas region at an interface of the complex oxide layer, and when a read / write voltage is applied to the spintronic device, a spin current generated by the magnetic tunnel junction structure tunnels into the two-dimensional electron gas region at the interface of the complex oxide layer, so as to change the density of a two-dimensional electron gas, such that the magnetic tunnel junction structure completes the reading or writing of data. Therefore, the effect of improving the reading reliability of the device is achieved.

The invention provides a catalyst as well as a preparation method and application thereof, and relates to the technical field of organic catalytic synthesis, the catalyst comprises a mesoporous zirconium-silicon composite oxide, and active metal cobalt and auxiliary metal which are loaded on the mesoporous zirconium-silicon composite oxide; the auxiliary metal comprises one or two of copper metal and nickel metal. Based on the catalyst provided by the invention, the problems of high cost, low active metal utilization efficiency, poor carrier stability and many byproducts of the catalyst in the prior art are solved.

The application discloses a rare earth composite oxide material and a preparation method and application thereof, and belongs to the technical field of cathode material preparation. x M 3‑ x N2O 7‑δ , wherein R is one or more of La, Pr, Nd, Sm, Eu, Gd and Y elements; M is one or more of Ba, Sr and Ca elements; N is one or more of Co, Fe, Ni, Mn and Cu elements, and 0.5<=x<=3. The rare earth composite oxide material has good structural stability and electrical conductivity, and is used as a cathode material of a solid oxide fuel cell and has excellent oxygen reduction reaction catalytic activity in a medium-low temperature range.

Provided is a positive electrode active material, a positive electrode, or a secondary battery having high charge load characteristics. The positive electrode active material includes a lithium complex oxide having a layered rock-salt structure. The lithium complex oxide contains lithium, a metal element including at least one of cobalt and nickel, and potassium. A ratio of a substance amount of potassium contained in the lithium complex oxide to a substance amount of the metal element included in the lithium complex oxide is 0.0005 or more and 0.03 or less. In the lithium complex oxide, potassium is distributed so as to extend in a direction intersecting a <001> direction of the layered rock-salt structure.

The present invention relates to a process for the preparation of a catalyst composition comprising - a support comprising TiO2, - a composite oxide comprising vanadium and antimony, having a rutile structure different from VSbO4 and V 0.92 Sb 0.92 O4 as determined by X-ray diffraction (XRD) analysis using Cu Ka radiation and - optionally, one or more selected from silicon oxide, vanadium oxide and antimony oxide; said process comprising the steps of: (i) mixing vanadium / antimony oxide and optional silicon source with the support comprising TiO2 in a solvent to obtain a suspension; (ii) optionally, applying the suspension onto a substrate; (iii) drying at a temperature in the range of 80 to 250 °C; (iv) calcination at a temperature of 600 °C to 700 °C.

The present application provides a method for preparing a positive electrode active material including a lithium nickel manganese-based composite oxide, a positive electrode active material precursor, and a lithium manganese-rich positive electrode active material. The method includes: preparing a nickel manganese-based oxide precursor by performing a first heat treatment on a nickel manganese-based hydroxide having a manganese content of about 34 mol% to about 50 mol% based on 100 mol% of total metal at a temperature of less than or equal to about 500 DEG C; mixing the nickel manganese-based oxide precursor with a lithium raw material to form a mixture in which the molar ratio of lithium of the lithium raw material to total metal of the nickel manganese-based oxide precursor is greater than about 1 and less than or equal to about 2; and performing a second heat treatment on the mixture.

A semiconductor stack includes a substrate formed of silicon, an oxide buffer layer formed of any one of zirconia, hafnia, and composite oxides of zirconia and hafnia, an alignment layer formed of gallium arsenide, and a compound semiconductor layer formed of a III-V compound semiconductor. The substrate, the oxide buffer layer, the alignment layer, and the compound semiconductor layer are stacked in this order.

The purpose of the present invention is to provide an exhaust gas purification catalyst capable of improving exhaust gas diffusivity and reactivity with respect to diffused exhaust gas, and to provide an exhaust gas purification catalyst (1) provided with a metal honeycomb substrate (10) and a catalyst layer (20) provided on the metal honeycomb substrate (10), the catalyst layer (20) contains a noble metal element, Ce-based oxide particles, and Ce-Zr-based composite oxide particles, and in a logarithmic differential pore volume distribution curve of the catalyst layer (20) obtained by a mercury intrusion method, a first peak value is present in the range of a pore diameter of 5-15 nm inclusive, a second peak value is present in the range of a pore diameter of 200-3200 nm inclusive, the first peak value is 0.060 mL / g or more, the second peak value is not less than 0.060 mL / g, and the third peak value is not less than 0.060 mL / g. The second peak value is 0.018 mL / g or more.

The present invention relates to a positive electrode active material, a positive electrode, and a lithium secondary battery, and more particularly, to a positive electrode active material, a positive electrode comprising the same, and an all-solid-state lithium secondary battery, the positive electrode active material comprising a surface-modified part in which an interface reaction product is artificially formed by sulfur (S) on the surface of lithium transition metal composite oxide particles, thus, side reactions between the positive electrode active material and the sulfide-based solid electrolyte are suppressed, compatibility is improved, and the lifespan and rate capability of an all-solid-state lithium secondary battery can be improved.

To provide an aqueous precursor solution for producing composite oxide nanoparticles, that enables production of nanoparticles of lanthanum-calcium-iron composite oxide by firing at a low temperature.SOLUTION: A precursor aqueous solution for producing composite oxide nanoparticles comprises: at least one lanthanum compound selected from lanthanum carbonates, acetates, oxides, hydroxides, oxyhydroxides, and alkoxides; at least one calcium compound selected from calcium carbonate, acetate, citrate, oxide, peroxide, hydroxide, and alkoxide; at least one iron compound selected from iron carbonates, acetates, citrates, oxides, hydroxides, oxyhydroxides, and iron ammonium citrate; and a coordinating organic compound having a coordinating ability capable of coordinating with a metal ion, wherein the aqueous precursor solution has a pH greater than 2.7 to less than 8. Mass of the coordinating organic compound is more than twice the theoretical mass of produced lanthanum-calcium-iron composite oxide nanoparticles.SELECTED DRAWING: Figure 1

A bidirectional FET switch combining gate elements greatly reduces chip area and cost through the use of a dielectric layer with a high dielectric constant of a complex oxide moderating peak electrical gradients when used with or without field plates.

A steel consists of, in mass %, C: 0.25 to 0.45%, Si: 0.10 to 0.50%, Mn: 0.40 to 0.70%, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfies Formula (1) to Formula (4) described in the present specification, wherein: its microstructure is composed of ferrite and pearlite having a total area fraction of 5.0 to 100.0%, and a hard phase having a total area fraction of 0 to 95.0%; a proportion of a total area of CaO—CaS—MgO—Al2O3 composite oxides with respect to a total area of oxides in the steel is 30.0% or more; and a number density of oxides having an equivalent circle diameter of 20.0 μm or more is 15.0 pieces / mm2 or less.