830 results about "Aluminium oxides" patented technology

A carbon dioxide (CO2) hydrogenation catalyst and a method of its preparation. The CO2 hydrogenation catalyst includes an alkali-metal enriched bauxite residue including calcium carbonate (CaCO3), iron(III) oxide (Fe2O3), iron(III) oxyhydroxide (FeO(OH)), aluminum hydroxide (Al(OH)3), sodalite, muscovite, and Na5Al2CSi3O15. The CO2 hydrogenation catalyst further includes 1 weight percent (wt. %) to 10 wt. % potassium based on a total weight of the CO2 hydrogenation catalyst by inductively coupled plasma optical emission spectroscopy (ICP-OES). The CO2 hydrogenation catalyst is used in a method of hydrogenating carbon dioxide to produce olefins.

This application provides a passivation structure and its preparation method, as well as a silicon solar cell and its preparation method. The passivation structure includes a first aluminum oxide layer, a first aluminum nitride layer, a second aluminum oxide layer, and a second aluminum nitride layer stacked together. The first aluminum oxide layer directly contacts the silicon edge and repairs cutting damage and dangling bonds through chemical passivation. It adapts to the p-type silicon region with a negative fixed charge. The first aluminum nitride layer passivates the n-type silicon with a positive fixed charge. The high hydrogen content enhances defect repair, and the dense structure blocks impurities from intruding. The second aluminum oxide layer supplements the negative charge to improve the passivation effect of the p-type silicon and forms stress complementarity with the aluminum nitride layer to prevent film cracking. The second aluminum nitride layer resists stringing and lamination damage, blocks moisture and corrosion, and ensures long-term performance. This structure achieves optimal simultaneous passivation of p / n-type silicon through charge complementarity and synergistic hydrogen passivation, improving the minority carrier lifetime at the cell edge, the implicit open-circuit voltage, and the module power, and solving the pain points of incomplete passivation and poor stability.

The present application relates to the field of high-speed spraying technology, in particular to a supersonic flame spraying process for steam turbine blades. The present application overcomes the problems of insufficient coating bonding strength and poor corrosion resistance of the supersonic flame spraying. The present application uses nickel-coated alumina composite sand for sandblasting pretreatment of the blades to achieve micro-implantation of active nickel; adjusts the ratio of NiCr and Cr3C2-NiCr powders by using double powder feeders to build a gradient structure coating with continuous component change; uses a modified sealing agent containing nano-alumina for vacuum impregnation sealing; and finally obtains finished blades through graded vacuum diffusion annealing. Through surface nickel implantation, gradient structure design and diffusion annealing, the present application realizes metallurgical bonding and thermal stress matching between the coating and the substrate, greatly improving the bonding strength; at the same time, the in-situ ceramicization reaction of the sealing agent eliminates micro-pores, significantly enhancing the corrosion resistance of the coating.

A method for exfoliating three-dimensional nanomaterials based on carbon nanotube growth is disclosed. A catalyst is loaded onto the surface of a three-dimensional nanomaterial composed of two-dimensional nanosheets. Energy, a carbon source, H2, and Ar are provided to the three-dimensional nanomaterial in a reactor to exfoliate the two-dimensional nanosheets by growing CNTs. The three-dimensional nanomaterial is composed of at least one combination of two-dimensional nanosheets, including nanoflowers and nanolayers. The two-dimensional nanosheets include at least one of alumina, silicon oxide, and magnesium oxide. The three-dimensional nanomaterial is obtained through hydrothermal or solvothermal chemical reactions. The energy is provided by indirect heating of the substrate, which is achieved by directly heating the reactor through thermal radiation or convection to generate heat in the substrate. This invention solves the problem of the difficulty in exfoliating three-dimensional nanomaterials.

The application discloses a method for directly preparing a nuclear micropore membrane with regularly arranged nuclear micropores based on a large-area AAO transmission film, and belongs to the technical field of nuclear micropore membrane preparation. The method comprises the following steps: taking a large-area through-hole anodic aluminum oxide (AAO) film as an ion transmission template, closely adhering the AAO film to a polymer substrate, and performing one-time vertical high-energy particle irradiation; particles penetrate along the regular channels of the AAO and form a large-area regular irradiation damage array on the substrate, which corresponds to the template; and through sensitization, chemical etching and post-processing, a nuclear micropore membrane with consistent nuclear micropore distances and regular arrangement is directly obtained. The method omits the traditional multiplication, alignment and multiple irradiation steps, is simple in process, high in product yield, and capable of large-area mass production, and is high in regularity of the nuclear micropore array, adjustable in parameters, and significantly improves the application performance of the nuclear micropore membrane in high-end fields such as radiation detection, wave absorption and high-precision separation.

The present application relates to the technical field of catalyst recovery, in particular to a recycling method of waste aluminum-based platinum-rhenium catalyst, a reforming catalyst and its application, and a method for catalytic reforming of naphtha. The recycling method comprises the following steps: S1, the waste aluminum-based platinum-rhenium catalyst is divided into two parts, one part is dissolved with an acid solution, and a first filtrate and a first filter residue are obtained by filtration; the other part is mixed with a hydroxide and then melted, the melt is dissolved with water, and a second filtrate and a second filter residue are obtained by filtration; S2, rhenium and platinum in the first filter residue and the second filter residue are separated; platinum and rhenium in the first filtrate are separated, and a tail liquid is obtained; S3, the second filtrate is mixed with the tail liquid obtained in step S2 to prepare alumina; S4, platinum and rhenium from the first filtrate, the first filter residue and the second filter residue in step S2 are enriched and loaded on the alumina prepared in step S3. The present application has high platinum and rhenium recovery rate, high economic benefit, and can realize full life cycle utilization of waste aluminum-based platinum-rhenium catalyst.

The present invention relates to a high-voltage anodization method and an aluminum substrate anodized thereby and, more specifically, to a high-voltage anodization method using a phosphoric acid solution as an electrolyte, which enables stable anodization while applying a high voltage without causing a burning phenomenon on the surface of the aluminum substrate, and an aluminum substrate anodized thereby. The high-voltage anodization method according to the present invention improves a voltage ramping process in anodizing using phosphoric acid so that a high voltage of 190 V or higher can be applied while preventing surface burning of the aluminum substrate, thereby enabling stable anodization of the aluminum substrate. In addition, an anodized membrane manufactured using the aluminum substrate produced by the high-voltage anodization method of the present invention can stably form a hexagonal nanostructure having large pores of 150 nm or greater.

The application discloses a high-hardness high-strength low-temperature sintering composite ceramic material and a preparation method thereof, and comprises the following raw materials in parts by weight: active silicon-aluminum composite material 35-45 parts, modified manganese-silicon slag 20-25 parts, alpha-alumina micro powder 10-15 parts, sodium feldspar 12-18 parts, wollastonite 8-12 parts, low-temperature composite flux 10-15 parts and water 80-100 parts. The high-hardness high-strength low-temperature sintering composite ceramic material takes the active silicon-aluminum composite material as the raw material, introduces multiple solid waste derived components such as the modified manganese-silicon slag and the low-temperature composite flux in the formula, the components complement each other and have a synergistic effect in the sintering process, so that the ceramic material has high hardness and high bending strength, and the unification of solid waste reduction, resource utilization and ceramic performance improvement is realized.

The present application belongs to the technical field of detection method, and particularly relates to a method for determining chlorides in reforming catalysts. The method comprises the following steps: burning the pretreated reforming catalyst sample to be determined to obtain a burned sample, adding water to extract the sample to obtain a chlorides extract, and determining the content of chlorides in the extract by silver nitrate titration. The temperature of the burning treatment is 600±25 DEG C, and the time is 1-3 hours. The present application discards the step of using magnesium chips / powder, which is an explosive hazardous material, in the traditional method, simplifies the sample pretreatment process, shortens the analysis time from 7 hours to 4 hours, eliminates the influence of wet base by calculating the mass fraction of alumina dry base and participating in the calculation of the content of chlorides, and improves the detection accuracy. The present application is safe, efficient, accurate and low in cost, and is suitable for monitoring chlorides in the whole life cycle of reforming catalysts in the petrochemical industry.

This invention relates to a method for preparing a high-wear-resistant metal-based composite material. This method significantly improves the wear resistance of the material by combining nano-reinforcing particles, surface modification technology, and self-healing capabilities. Aluminum alloy or titanium alloy is selected as the matrix, and nano-sized silicon carbide or alumina particles are used as reinforcing materials. The reinforcing materials are uniformly dispersed using processes such as stir casting, forging, diffusion bonding, infiltration, or powder metallurgy. The composite material structure is then precisely formed using 3D printing technology. The surface of the composite material is treated with a nano-coating or plasma treatment to enhance its wear resistance and corrosion resistance. Furthermore, by embedding microcapsules containing a repair agent into the material, automatic repair of worn areas is achieved, improving the material's reliability and service life. This composite material is particularly suitable for mechanical engineering and automotive manufacturing, especially in the manufacture of automotive brakes under high-wear environments, demonstrating excellent performance and broad application prospects.

This invention relates to rare-earth single-atom doped alumina-supported platinum cluster catalysts, their preparation methods, and applications. The catalyst comprises a catalyst support and platinum nanoclusters dispersed on the catalyst support. The catalyst support is an alumina support doped with rare-earth elements in single-atom form. The preparation method includes the following steps: Step 1: preparing a rare-earth-aluminum composite metal oxide precursor; Step 2: preparing a catalyst support; Step 3: loading platinum onto the catalyst support; Step 4: activating the platinum-supported catalyst support. The catalyst is applied in the dehydrogenation reaction of cycloalkane. This invention, by precisely doping rare-earth elements into the alumina lattice in single-atom form, constructs stable rare-earth-oxygen active sites within the lattice, significantly promoting the migration and diffusion of hydrogen atoms from the platinum clusters to the support surface, thereby greatly enhancing the hydrogen spillover effect, improving the utilization efficiency of active hydrogen, and achieving precise control over complex reaction pathways.

The present application relates to a kind of Y type molecular sieve catalytic material for improving gasoline yield and selectivity and its preparation method, Y type molecular sieve catalytic material is obtained by the hydrothermal crystallization of reactive microspheres containing zirconium, reactive microspheres containing zirconium contain 85-99.9 wt% alumina matrix and 0.1-15 wt% zirconium oxide, and the zirconium oxide contains tetragonal phase crystalline zirconium oxide.The Y type molecular sieve catalytic material of the present application has better strength and cracking effect, and the catalyst containing the Y type molecular sieve catalytic material of the present application can improve the selectivity and yield of catalytic cracking gasoline.

The application provides a silicon composite negative electrode material and a preparation method thereof, and relates to the technical field of lithium ion battery electrode materials. The method comprises the following steps: vacuum thermal reduction of graphene oxide to obtain graphene nanosheets; mixing of a strong acid and a silicon-based material, while adding the graphene nanosheets, stirring for 5min-60min, and then filtering and washing the turbid liquid to obtain a precipitate; adding lithium hexafluorophosphate into an organic solvent, placing the organic solvent in a sealed container, adding the precipitate and aluminum oxide at 60-180 DEG C, and reacting for 2-10h, and then drying to obtain the silicon composite negative electrode material. The silicon composite negative electrode material has high initial coulomb efficiency and good cycle stability.

The present invention provides a heat exchanger capable of stably and continuously recovering heat over a long period of time, even when the target gas for heat recovery is an extremely corrosive gas, and an exhaust gas treatment device using such a heat exchanger. [Solution] The heat exchanger of the present invention is characterized by comprising a partition plate (14) made of refractory castable material that divides the inside of the casing (12) so that the low-temperature side fluid (LF) and the high-temperature side fluid (HF) flow in countercurrents, and a plurality of solid heat transfer rods (16) made of at least one ceramic selected from the group consisting of alumina, zirconia, silicon carbide, silicon nitride, molybdenum silicide, and lanthanum chromite, which are arranged to airtightly penetrate the front and back surfaces of the partition plate (14) and cross the flow paths of the low-temperature side fluid (LF) and the high-temperature side fluid (HF).

An increase in voltage of a light-emitting device manufactured through a step of forming an aluminum oxide film in contact with an organic compound layer is inhibited. An organic compound film is formed over a first electrode. An organic mask film containing an organic compound which has low solubility to water or a chemical solution including water as a solvent is formed over the organic compound film. An inorganic mask layer is formed over the organic mask film. Shapes of the organic mask film and the organic compound film are processed with the use of the inorganic mask layer, whereby an organic mask layer and an organic compound layer are formed. At least parts of the inorganic mask layer and the organic mask layer are removed with the use of water or a liquid including water as a solvent.

The application discloses a self-combustion-based reprocessing roasting furnace device for alumina balls, which comprises a box shell (1) used as a containing support, a furnace core (9) arranged in the box shell (1), and a gas pipe group arranged in the furnace core (9). The box shell (1) is used for supporting the furnace core (9) in the inner cavity, the gas pipe group is used for injecting oxygen and high-temperature flue gas into the furnace core (9), and the furnace core (9) is used for high-temperature combustion of alumina balls after adsorbent use. The alumina balls after adsorbent use are treated by high-temperature roasting self-combustion to eliminate attachments, and the technical problem that the alumina balls after adsorbent use are put into a heating container for combustion by natural gas is solved, so that the reprocessing cost of the alumina balls after adsorbent use is reduced.

A sensor element including an oxygen-ion conductive solid electrolyte body, a detection electrode provided on a surface of the electrolyte body and in contact with a measured gas, and a reference electrode provided on the other surface of the electrolyte body and in contact with a reference gas; a catalyst layer covering the detection electrode and including a porous carrier of ceramic particles, and catalyst particles supported on the carrier and formed of a noble metal (Pt, Pd, Rh, and / or Au). The carrier includes oxide particles bonded to portions of surfaces of the ceramic particles, the oxide particles having a composition different from the ceramic particles, being smaller than the ceramic particles, and being formed of zirconia, alumina, or lanthana. The catalyst particles are supported on either of surfaces of the oxide particles and the surfaces of the ceramic particles.

The utility model provides a kind of aluminium smelting aluminium oxide recovery device, including smelting box, the inside of smelting box is provided with partition baffle, the inside space of smelting box is formed by partition baffle and is separated into stirring area and impurity removal area, the inside of stirring area is provided with stirring assembly, for accelerating aluminium dissolution, the top of impurity removal area is provided with impurity removal assembly, the middle of one side of smelting box close to impurity removal assembly is provided with recovery assembly, the device is separated into stirring area and impurity removal area by being provided with partition baffle, stirring assembly accelerates aluminium dissolution in stirring area, so that aluminium oxide impurity is better separated, then aluminium liquid flows into impurity removal area by through-hole in the middle of partition baffle, the mode of this area division and collaborative work makes that impurity removal process is more orderly, avoids the secondary mixing of impurity in smelting process, and further improves impurity removal effect.

The present application provides a kind of catalyst for preparing furfuryl alcohol by furfural hydrogenation, its preparation method and its application in preparing furfuryl alcohol by furfural hydrogenation.The preparation method of the present application comprises the following steps: under stirring condition, water is added to aluminum isopropyl alcohol;After stirring reaction, filtration, washing, drying, then high temperature calcination is obtained to obtain alumina;Alumina is immersed in copper nitrate solution, impregnation is stirred, dried, calcined reduction to obtain catalyst.The catalyst of the present application is Cu-Al catalyst, the preparation method of catalyst is simple, green and environmentally friendly, and the cost is low;The obtained catalyst is applied to the preparation of furfuryl alcohol by furfural hydrogenation, so that the reaction can be carried out at lower reaction temperature and lower reaction pressure, and furfuryl alcohol can be prepared with high conversion rate and high selectivity, the conversion rate of furfural can reach 100%, and the selectivity of furfuryl alcohol can reach 100%.

This invention discloses a veterinary aluminum hydroxide adjuvant for foot-and-mouth disease (FMD) vaccines and its preparation method via aluminum alkoxide hydrolysis. The adjuvant is a boehmite phase, and through innovative processing, the crystallinity and morphology are synergistically controlled, achieving a relative crystallinity of 10%-25%. The primary particles are rod-shaped or needle-shaped, with an average aspect ratio of 4:1 to 8:1. The preparation method includes: dissolving an aluminum alkoxide compound, then subjecting it to a controlled hydrolysis reaction at 50-80℃ and pH 4.5-6.5 under normal pressure for 36 hours, followed by aging at 425℃ for 2472 hours. The product is obtained after solid-liquid separation, washing, and drying. The obtained adjuvant exhibits an adsorption rate of over 96% for FMD virus inactivated antigen within 1 hour, and a cumulative antigen dissociation rate of less than 5% after 7 days at 37℃. In vitro stimulation of macrophages to secrete IL-1β and TNF-α levels is more than 1.7 times that of commercially available aluminum hydroxide adjuvants, significantly superior to traditional aluminum hydroxide adjuvants, providing a new material for the preparation of highly effective FMD vaccines.

Embodiments of the present disclosure generally relate to protein powder compositions and methods for preparing the same. In one or more embodiments, methods include coating a plurality of protein powder particles containing myoglobin with an aluminum oxide coating to form a plurality of coated particles during an atomic layer coating (ALC) process. The protein powder compositions have improved properties over the corresponding uncoated protein powder. The protein powder compositions have greater flowability, density, and a greater level of recoverability over the corresponding uncoated protein powder.

The application discloses a kind of perfluoropolyether nanocomposite grease and preparation method thereof, belong to the technical field of lubricating material.The lubricating grease includes perfluoropolyether base oil, polytetrafluoroethylene thickener and composite nano additive, wherein the composite nano additive is composed of surfactant modified antiwear additive, structure stabilizer, rust and oxidation inhibitor.Antiwear additive is one of nano copper, nano cerium oxide, nano titanium oxide and molybdenum sulfide, structure stabilizer is one of nano silicon oxide and porous alumina, and rust and oxidation inhibitor is nano zinc oxide.The composite nano additive is introduced in the form of perfluoropolyether oil phase dispersion, and is homogenized with thickener under the condition of 150~260℃ after dispersion and mixing.The application realizes the synchronous improvement of lubricating grease wear resistance, colloid stability, rust and oxidation resistance and oxidation stability through the synergistic effect of various nanomaterials, and is suitable for harsh working condition environment such as high temperature, high load, high vacuum and strong corrosion.

Pumpable slurry compositions comprising at least one aluminosilicate additive and optional pozzolanic cement additives and methods for improving development of compressive strengths in the pumpable cement slurry compositions are disclosed herein. The methods utilize one or more pumpable cement slurry compositions comprising at least one cement component, water, at least one first aluminosilicate additive, at least one optional second aluminosilicate additive, and one or more optional pozzolanic additives, wherein the at least one first aluminosilicate additive has an amorphous phase of greater than about 50% and a weight ratio of silica oxide to aluminum oxide of about 1.0 to about 2.5, and the at least one optional second aluminosilicate additive has a weight ratio of silica oxide to aluminum oxide of about 1.7 to about 3.3.

This invention belongs to the field of preparation technology of polyethylene-containing organic polymer compounds, and particularly relates to a rotational molding part and its preparation process, comprising the following steps: dispersing modified alumina and modified ammonium polyphosphate in anhydrous ethanol, adding EGDMA, VTMS hydrolysate and an initiator, mixing, heating, stirring and reacting, slowly adding TEOS hydrolysate under continuous stirring, filtering, washing, heating and curing, immersing in preheated silicone oil, cooling, filtering, washing and dispersing, and drying to obtain flame-retardant powder; mixing the flame-retardant powder, high-density polyethylene and crosslinking agent, extruding in an extruder, pelletizing, drying, pulverizing, sieving, and then rotationally molding to obtain the rotational molding part. This invention can slow down the loss of modified ammonium polyphosphate in high temperature and high humidity environments and improve the long-term stability of the flame retardancy of the rotational molding part.

The application relates to the technical field of functional ceramics, and mainly relates to a ceramic material for a ceramic heater and a preparation method thereof. The ceramic material for the ceramic heater comprises the following raw materials: 90-100 parts by weight of alumina; 5-10 parts by weight of modified calcium silicate glass powder; 0.1-1 part by weight of yttrium oxide; 5-15 parts by weight of modified zirconium oxide; 0.1-1 part by weight of silicon dioxide; 0.1-1 part by weight of magnesium oxide; 1-5 parts by weight of a binder; and the preparation raw materials of the modified calcium silicate glass powder comprise quartz sand, limestone and alumina. The ceramic material for the ceramic heater provided by the application is excellent in thermal shock resistance, thermal conductivity, mechanical properties and the like, and can well adapt to the application scene of the ceramic heater.

The application relates to the technical field of adsorbing materials, in particular to a fly ash-based adsorbing material based on ore-drawing excitation modification as well as a preparation method and application thereof, wherein fly ash, alkaline substances and ore-drawing agents are uniformly mixed according to a mass ratio of 30-90:5-35:15-35 to obtain a solid mixture; the solid mixture is uniformly mixed with water, stirred and reacted, the reaction product is separated into solid and liquid, dried, and the product is obtained; the ore-drawing agent is composed of tetracalcium sulphoaluminate, dicalcium silicate, calcium sulphate dihydrate, aluminum oxide, silicon dioxide and calcium carbonate. The fly ash-based adsorbing material based on ore-drawing excitation modification has excellent CPM adsorption capacity, the inorganic component adsorption rate reaches more than 75%, the organic component adsorption rate can reach more than 60%, and the material has a wide application prospect.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

The application discloses a kind of heat-conducting fillers, silicone heat-conducting pouring sealant and its preparation method and application, belong to the technical field of silicone heat-conducting pouring sealant, the heat-conducting filler with secondary aluminum ash as raw material, by calcium salt realizes the soluble fluorine ion in secondary aluminum ash after fluorine removal, then hydrolysis coupling agent is carried out to its surface treatment under certain pH value, and the pouring sealant heat-conducting filler with good dispersibility and reinforcing performance is obtained.The filler retains high thermal conductivity aluminum nitride and aluminum oxide composition at the same time, and the fluorine ion leaching concentration meets the requirements, and the heat-conducting pouring sealant can be prepared after being mixed with the pouring sealant material.The application has the characteristics of simple process, low cost and easy industrialization, and opens up a new way for the resource utilization of secondary aluminum ash, a kind of hazardous waste.

A component for use in a semiconductor processing chamber is provided. A component body of a metal or metal alloy has a process facing surface. An intermediate aluminum oxide coating is on the process facing surface, wherein the intermediate aluminum oxide coating is at least 99% pure by weight and has a porosity of less than 0.1% by volume, and wherein the intermediate aluminum oxide coating has a first thickness. A process exposed layer is on the intermediate aluminum oxide coating, wherein the process exposed layer comprises at least one of yttrium, hafnium, zirconium, lanthanum, magnesium, and a lanthanide, and wherein the process exposed layer is at least 99% pure by weight and has a porosity of less than 0.1% and has a second thickness, wherein the second thickness is less than or equal to the first thickness.