408 results about "Alumina composite" patented technology

An object of the invention is to provide an yttria-alumina composite oxide film wherein peeling-off of the film from a substrate may be prevented. An intermediary layer is provided on a substrate containing at least one of alumina and yttria-alumina composite oxide as a main component. In the intermediary layer, a ratio (Y/A) of a molar ratio Y of yttria to a molar ratio A of alumina is not smaller than 0.1 and not larger than 0.9. An yttria-alumina composite oxide film is formed on the intermediary layer. A ratio (YAG (420)/M) of a peak intensity YAG (420) of a (420) plane of a garnet phase to a maximum peak intensity M of crystal phases other than the garnet phase is 2.5 or more in the yttria-alumina composite oxide film based on an X-ray diffraction measurement.

The invention relates to a method for preparing the composite cathode of lithium battery, wherein said cathode material is formed by silicon/copper/carbon; said silicon has nanometer porous structure; the nanometer silicon/alumina composite, nanometer silicon/alumina/copper composite, and nanometer silicon/alumina/copper/carbon composite, with high disperse degree, is obtained by high-energy grinding; then adding hydrochloric acid; removing alumina, and over alumina, to obtain said composite cathode. And the inventive method uses hydrochloric acid to remove the inactive alumina and over aluminum, to improve specific capacity of composite; and the treatment of hydrochloric acid makes the silicon with nanometer porous structure, to adsorb the volume change when embedding lithium, to buffer volume effect, improve the structure stability. And the reversible capacity of said cathode material can reach 580mAh .g-1; in the first 35 cycles, the average capacity damage of each cycle is 0.1%.

The invention discloses a three-dimensional fiber prefabricated member reinforced aluminum oxide composite material and a preparation method thereof. The three-dimensional fiber prefabricated member reinforced aluminum oxide composite material comprises a three-dimensional fiber prefabricated member and aluminum oxide, wherein the aluminum oxide uniformly fills pores of the three-dimensional fiber prefabricated member and is physically combined with the three-dimensional fiber prefabricated member, the aluminum oxide is alpha-Al2O3 ceramics, and the porosity of the three-dimensional fiber prefabricated member reinforced aluminum oxide composite material is 9 percent to 16 percent. The preparation method comprises: (1) immersing; (2) drying; (3) carrying out the heat treatment; (4) repeating an immersion-drying-heat treatment process of the step (1) to (3). The three-dimensional fiber prefabricated member reinforced aluminum oxide composite material has the advantages of low porosity, high compactness, high stability and excellent mechanical performance. The preparation method is high in preparation efficiency; and moreover, the compactness and the mechanical performance of the prepared composite material are remarkably improved.

The invention discloses a high-alumina structure heat-insulation integrated composite brick and a preparation method. The high-alumina structure heat-insulation integrated composite brick comprises a heavy working layer adopting compact bauxite chamotte as main raw material and a high-strength light heat-insulation layer adopting alumina hollow ball, aluminum-magnesium hollow ball, corundum hollow ball, hollow micro-sphere, light ceramic particle or the mixture of the above materials as a skeleton material, and is formed by compounding the heavy working layer and the light heat-insulation layer in a vibration pressurizing way or a mechanical formation way, and the length ratio of the heavy working layer and the light heat-insulation layer is 1 to 5: 2 to 1. The high-alumina structure heat-insulation integrated composite brick overcomes the weakness that the high-alumina brick for rotary kiln has large heat conduction coefficient or overcomes the weakness that the heat-insulation layer of the present high-alumina composite brick has low strength and is easy to break. The invention provides the structure heat-insulation integrated composite brick with good abrasion resistance, high refractoriness, good structural strength and good heat-preserving and heat-insulation performance.

The invention relates to a catalyst for removing mercaptan sulfur in catalytic gasoline at low temperature and a preparation method of the catalyst, belonging to the field of gasoline desulfurization. The catalyst for removing the mercaptan sulfur in the catalytic gasoline at low temperature is prepared by taking aluminium oxide or nano HZSM-5 molecular sieve and alumina composite solid acid as carriers, and comprises the following components based on the total mass of the catalyst: 5-20% of zinc oxide, 5-15% of ferric oxide, 0.5-5% of lanthanum oxide and 0.5-5% of phosphorus oxide. The catalyst disclosed by the invention is applicable to a low temperature hydrogenation sweetening reaction of the catalytic gasoline and has the characteristics of high sweetening activity, low olefin hydrogenation saturation activity, high liquid yield, nearly no loss of octane number and the like.

The invention provides a high performance nanometer combined catalytic coating material of an automobile tail gas purifier and preparation method thereof. The coating material is prepared from alumina composite oxides nano-material with high heat resistance and large specific surface area and cerium zirconium composite oxides nano-material of high oxygen storage property by ball milling at a certain ratio through nanometer combination technology, and controlling appropriate pore structure, surface structure and particle size under the action of certain assistant. The coating material can still retain original excellent performance of the nano-materials at 500-1100 DEG C. The inventive catalytic coating material retains original excellent performance of the nano-materials, has larger specific surface area and higher hydrogen storage capability compared with the prior material, and can be used in automobile tail gas catalyst for the purification of the automobile tail gas to realize low discharge and ultra-low discharge of automobile tail gas pollutant. The preparation method is scientific, reasonable, easy in operation and low in cost; and has remarkable socioeconomic benefit.

The invention relates to an anti-carbon-deposition Ni-based catalyst for hydrogen production by methane steam reforming and a preparation method thereof. By taking lanthanum nitrate, praseodymium nitrate, samarium nitrate, yttrium nitrate, zirconium nitrate, zirconium carbonate, zirconium oxychloride, and the like as precursors and taking ammonia as a precipitant, a pyrochlore composite oxide is prepared through using a coprecipitation method; and then the pyrochlore composite oxide is mixed with alumina by using a mechanical mixing method so as to obtain a pyrochlore alumina composite carrier. Nickel nitrate, nickel chloride, nickel sulfate, nickel oxalate and the like serving as nickel sources are loaded on the pyrochlore alumina composite carrier through direct immersion. The loading capacity of nickel in the catalyst accounts for 5-30% of the weight of the catalyst, the pyrochlore content of the catalyst is 5-50%, and the alumina content of the catalyst is 20-90%. By taking the pyrochlore alumina composite oxide as a carrier, the reaction activity and anti-carbon-deposition performance of the catalyst can be greatly increased; the preparation method of the catalyst is simple; and the catalyst has excellent catalytic activity and stability to methane steam reforming in a stationary bed.

The invention relates to a phosphor in a polycrystalline ceramic structure and a light-emitting element provided with the same comprising a Light-Emitting Diode (LED) in which a composite structure of phosphor particles is embedded in a matrix, characterized in that the matrix is a ceramic composite structure comprising a polycrystalline ceramic alumina material, hereafter called luminescent ceramic matrix composite. This luminescent ceramic matrix composite can be made by the steps of converting a powder mixture of ceramic phosphor particles and alumina particles into a slurry, shaping the slurry into a compact, and applying a thermal treatment, optionally in combination with hot isostatic pressing into a polycrystalline phosphor-containing ceramic alumina composite structure. The luminescent ceramic matrix composite further allows a method of tuning the light-diffusing properties by changing at least one of the fractions of phosphor particles and second ceramic particles, the grain size of the particles of the ceramic composite structure, the difference in the refractive index of the particles of the ceramic composite structure, and the porosity in the polycrystalline phosphor-containing ceramic composite structure.

The invention provides a preparation method of an activated carbon and alumina composite material, which comprises following steps: phenol and formalin are mixed in proportion, heated and stirred, so as to enable the phenol to be completely dissolved; aluminum hydroxide is added to an obtained processed solution to react, and then an acid solution is added to the processed solution to neutralize the processed solution, so that the reaction is stopped; the mixed solution is cooled to room temperature, decompressed and dehydrated, so as to obtain a liquid mixture; a foaming agent and a curing agent are added to the liquid mixture, and the liquid mixture is rapidly stirred, foamed and cured, so as to obtain a foam body; and the foam body is cut into a certain shape, put into a heating furnace to be carbonized and activated, and then the activated carbon and alumina composite material can be obtained. By adopting the preparation method, two materials, namely activated carbon and alumina can be tightly combined together, and the prepared activated carbon is firmly and evenly fixed in the activated alumina, so that the deficiencies of low strength and short service life of the activated carbon are corrected; and the preparation method is simple and practicable, requires low cost and is suitable for large-scale industrial production.

The invention discloses a preparation method of a mesoporous alumina composite adsorbent functionalized by alkali metal. The method comprises the following steps of: firstly fully agitating and uniformly mixing aluminum salt solution and Pluronic triblock copolymer solution, dropwise adding carbonate solution of the alkali metal in the case of slow agitation, and preparing the mesoporous alumina composite adsorbent functionalized by alkali metal from the obtained sediment via washing, drying and calcining of deionized water and absolute ethyl alcohol after solvent evaporation induced self-assembly or hydro-thermal treatment. The preparation method disclosed by the invention has the advantages of simple process, mild condition, low material cost, in-situ one-pot liquid-phase introduction of alkali metal components and carrier components and the like, and the obtained mesoporous alumina base composite material functionalized by Na- and K- has excellent adsorptive property on greenhouse gases CO2 (carbon dioxide) and highly toxic pollutants Cr (chromium)(VI) in a water body.

The invention provides a carbon/alumina composite carrier catalyst used for hydrazine decomposition reaction and a preparation method thereof. The catalyst showed in the formula is A/C-Al2O3, C-Al2O3 is the carbon/alumina composite carrier, and active constituent A is transition metal Mo, W, Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt or carbonization, nitride and phosphide thereof; wherein, the content of the A is 2-40wt percent and the preparation temperature of the A is 300-900 DEG C. The invention has simple preparation, especially for the preparation of active species of the transitional metal carbonization, which uses H2 instead of CH4/H2 gas used in the past preparation to have direact reduction; the invention prevents carbon deposition on the surface of the carbonization from inactivating, thus being beneficial to acquire more catalytic active sites.

An alumina composite sintered body 1 in which fine particles 2 are dispersed in the crystal grains 4 and/or at the crystal grain boundaries 3 of an alumina sintered body obtained by sintering alumina crystal grains 4; an evaluation method thereof; and a spark plug using the alumina composite sintered body 1. Arbitrary regions in the cross-section of the alumina composite sintered body 1 are taken as analysis surfaces, and when the cross-sectional areas of the fine particles 2 contained in each analysis surface are measured, the ratio of the cross-sectional areas occupying in the area of the analysis surface is from 1 to 20%; when the cross-sectional areas of the fine particles 2 contained in each of analysis surfaces adjacent to each other are measured, and the cross-sectional area is converted into a circle having the same area, the diameter of the circle is from 0.1 to 4 μm; and when the concentration A (wt %) of the fine particles 2 contained in each analysis surface is compared with the concentration B (wt %) of the fine particles 2 used at the production, the difference between the concentration A and the concentration B is within ±20 wt %.

The invention relates to an extraction method of high-purity chlorogenic acid, which comprises the steps of raw material preparation and pretreatment, enzyme treatment, ultrasonic treatment, preparation of the chlorogenic acid product, and the like. In the preparation process, an inorganic membrane is used, wherein the support of the inorganic membrane is alumina ceramic or honeycomb ceramic, and the inorganic membrane is an alumina composite microfiltration membrane. The raw material is honeysuckle flower, eucommia, cacao tree, coffee or the like. When the raw material is the honeysuckle flower, the extraction rate of the chlorogenic acid is up to 97.5%, and the purity is up to 99%. The method provided by the invention can simply and quickly obtain stable-quality high-purity high-yield safe reliable chlorogenic acid from the raw material.

The invention belongs to the field of composite functional materials and particularly relates to a color-tunable fluorescent carbon quantum dot/Eu<3+>/mesoporous alumina composite luminescent material, preparation thereof and application of the carbon quantum dot/Eu<3+>/mesoporous alumina composite luminescent material in the aspects of temperature sensing and optical devices. The composite luminescent material comprises fluorescent carbon quantum dots, of which surfaces contain hydroxyl or amino, and trivalent-europium-doped mesoporous alumina. According to the composite luminescent material, rare-earth trivalent europium, which emits red light under an ultraviolet lamp, and the fluorescent carbon quantum dots which emit blue light are doped into pore passages of the mesoporous alumina, then, composite fluorescent powder with dual emission peaks is obtained, and the ratio of fluorescence intensity of the two emission peaks in a relatively wide temperature range has a good linear relationship and stability, so that the rapid and effective detection and sensing of temperature can be excellently achieved, and the composite luminescent material can be applied to the aspect of temperature sensing. Due to a tunable color, the composite luminescent material can also be applied to the optical devices.

The invention discloses a novel nano composite methanation catalyst and a preparation method thereof. The preparation method comprises the following steps: adding a tetrabutyl titanate and ethyl alcohol mixed solution dropwise into an ethyl alcohol and nitric acid mixed water solution at room temperature, and hydrolyzing tetrabutyl titanate so as to obtain sol; drying the sol to form gel, and forging to obtain nano TiO2 powder; mixing pseudo-boehmite and deionized water to obtain a turbid liquid, and adding nitric acid to obtain semitransparent sol gama-AlOOH; adding the nano TiO2 powder into the semitransparent sol gama-AlOOH, drying overnight, and baking to obtain TiO2/gama-Al2O3 nano powder as a methanation catalyst carrier; dipping a nickel nitrate solution on the methanation catalyst carrier, drying, and forging to obtain a NiO/TiO2/Al2O3 catalyst; and dipping an additive on the carrier, thereby obtaining a NiO-M/TiO2/Al2O3 catalyst. According to the invention, nanoscale titanium oxide and a nanoscale aluminum oxide composite material act as the carriers, and NiO acts as an active component, so that the novel nano composite methanation catalyst is prepared.

The invention relates to a preparation method of a polycrystal zirconia fiber and zirconia/alumina composite fiber, which is characterized by comprising the following steps of: with zirconium carbonate and hydrochloric acid as raw materials and water or a mixture comprising water and alcohol as a solvent, preparing uniform and transparent polyhydroxy zirconium chloride sol under a refluxing state; adding a phase stabilizer, a grain growth inhibitor and a water-soluble polymer spinning aid to the sol and distilling at reduced pressure to prepare an inorganic zirconium spinning solution, or adding aluminum sol, the phase stabilizer, the crystal grain growth inhibitor and the water-soluble polymer spinning aid to the sol and distilling at reduced pressure to prepare an aluminum-zirconium composite spinning solution; and preparing gelatin fiber through centrifugal fiber throwing or blowing spinning, and carrying out heat treatment to obtain the polycrystal zirconia fiber and zirconia/alumina composite fiber. The preparation method disclosed by the invention has the advantages of low price of raw materials, simple equipment, low requirement on environment, no need of inertial environment, short flow time of the whole process and suitability for industrial production.

The invention discloses a double-oxidization catalyst for purifying diesel engine exhaust and a preparation method thereof. The double-oxidization catalyst comprises a front-stage carrier and a rear-stage carrier which are orderly arranged along the axial direction of an engine exhaust port, wherein the front-stage carrier is arranged near the engine exhaust port; the rear-stage carrier is arranged far away from the engine exhaust port; a front-stage coating is coated on the front-stage carrier; a rear-stage coating is coated on the rear-stage carrier; slurries for preparing the front-stage coating and the rear-stage coating respectively contain deionized water, rare-earth complex oxide, modified aluminum oxide, a binder and active ingredients; and at least one of the two slurries for preparing the front-stage coating and the rear-stage coating also contains silica-alumina composite oxide. By adopting the double-oxidization catalyst for purifying the diesel engine exhaust and the preparation method thereof, the loading amount of the active coating is effectively increased; dropping of the coatings is overcome; the coatings are even and have significant catalytic activity; and purification of the diesel engine exhaust can be effectively achieved.

The invention discloses an aluminum matrix-mesoporous alumina composite material and a preparation method and application of the aluminum matrix-mesoporous alumina composite material. The composite material consists of an aluminum matrix and a mesoporous alumina layer growing on the surface of the aluminum matrix, wherein the mass percent of mesoporous alumina is 0.05-50%, and the most probable pore diameter of a mesopore is 2-20nanometers. The preparation method of the composite material comprises the following steps: firstly, carrying out in-situ growth on pseudo-boehmite on the surface of the aluminum matrix via the reaction of aluminum and water under a hydrothermal condition, and then carrying out high-temperature roasting and crystal transformation on the generated pseudo-boehmite. The composite material provided by the invention has the advantages of good heat conductivity, high permeability, easiness in forming, filling and storage, and the like, is an ideal catalyst carrier, and can be used for preparing a catalyst loading activity metal or activity metal and auxiliary metal oxides as the catalyst carrier.

The invention relates to a method for preparing a porous alumina composite material through a biological template method. The method comprises the following steps: duplicating a macro-pore tubular structure of a plant leaf, which is used as a biological template, through alumina in a material preparation process to obtain biomorphic alumina with a macro-pore fiber tubular structure; growing an LDHs (layered double hydroxides) nanosheet in a macro-pore channel of the biomorphic alumina in situ through an in-situ growth technology to obtain a porous LDHs/alumina composite material; roasting the porous LDHs/alumina composite material at the temperature of 500-800 DEG C to obtain the porous alumina composite material. The LDHs nanosheet is grown in the macro-pore channel of the biomorphic alumina, so that the specific surface area of the biomorphic alumina can be remarkably increased, and the pore structure of the biomorphic alumina is diversified. The porous alumina composite material can be widely applied to the fields of adsorption, catalysis and the like.

The invention provides a petroleum resin hydrogenation catalyst comprising a titania-alumina composite oxide carrier, and Ni, a VIII group element, a VIB group element and a lanthanide group element which are loaded on the carrier. Under the catalysis of the catalyst, petroleum resin hydrogenation reaction has high conversion rate and selectivity, and hydrogenation petroleum resin with the good chromaticity, low bromine price and good thermal stability can be prepared. In addition, the preparation method of the catalyst is simple, and is suitable for industrialized production.

The invention discloses a Na2Fe2(SO4)3@alumina composite material having a core-shell structure and a preparation method and an application thereof. The material is a composite material having the core-shell structure and prepared by coating the surface of Na2Fe2(SO4)3 particles with alumina. The Na2Fe2(SO4)3 is pyrolytically coated with an organic aluminum salt, the problems that Na2Fe2(SO4)3 is dissolved in water and is difficultly coated by alumina via a traditional hydrolysis method are overcome, the synthesis method is simple, conditions are mild, and the yield is high; the prepared composite material can effectively suppress a 'surface poisoning effect' of the material, and has the advantages of high specific capacity, high work voltage, good cyclic stability and excellent rate performance when applied as a sodium ion battery positive electrode material.