17 results about "Aluminum oxide hydroxide" patented technology

The invention relates to the field of inorganic powder preparation, and particularly discloses a preparation method and application of aluminum nitride powder. The preparation method of the aluminum nitride powder comprises the following steps: (1) by taking water as a dispersion medium, dispersing hydroxyl aluminum oxide and a carbohydrate into the dispersion medium, and then carrying out hydrothermal reaction to obtain a precursor; the precursor has a carbon-coated hydroxyl alumina core-shell structure; (2) calcining the precursor in a nitrogen-containing atmosphere to obtain aluminum nitride powder; wherein the volume equivalent diameter of the aluminum hydroxide is less than 0.82 mu m. By implementing the method, the aluminum nitride powder with high purity and excellent particle size distribution can be obtained.

The invention relates to a copper-based composite catalyst and a preparation method and application thereof.The copper-based composite catalyst comprises an inner core and a shell wrapping the surface of the inner core, the inner core comprises copper nanowires, and the shell comprises hydroxyl aluminum oxide. According to the copper-based composite catalyst provided by the invention, the surface of the copper nanowire inner core is coated with the aluminum hydroxide shell, and the aluminum hydroxide in the shell and the copper nanowire in the inner core construct a copper-oxygen-aluminum metal interface site on the surface of the inner core through the lewis acid-alkali interaction, so that the migration energy of the surface of copper atoms can be improved; the copper species in the inner core are stabilized, the reconstruction of the copper-based catalyst is avoided, and the selectivity and the stability of the copper-based composite catalyst are improved.

The present invention relates to an improved catalyst for MWCNT production. The present invention also relates to an iron-free supported catalyst for the selective conversion of hydrocarbons into carbon nanotubes, said catalyst comprising cobalt and vanadium as active catalytic metals in any oxidation state on a catalyst support comprising hydroxyl alumina, wherein: - the mass ratio of cobalt to vanadium is between 2 and 15; - the mass ratio of cobalt to aluminum is between 5.8 x 10 ‑2 and 5.8 x 10 ‑1 ; and - the mass ratio of vanadium to aluminum is between 5.8 x 10 ‑3 and 8.7 x 10 ‑2 . The present invention also relates to a method for the preparation of said iron-free supported catalyst and to a method for the preparation of carbon nanotubes using said iron-free supported catalyst.

The invention discloses a sodium ion battery and a preparation method thereof, the sodium ion battery comprises an electrolyte and an electrode assembly, the electrode assembly comprises a negative electrode and a positive electrode; the electrolyte comprises a fluorine-containing sodium salt, a fluorine-containing potassium salt and an organic solvent, the negative electrode comprises a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material and an additive, and the additive is aluminum hydroxide. According to the sodium ion battery provided by the invention, the potassium salt in the electrolyte and the hydroxyl alumina in the negative electrode act together, the surface of the hydroxyl alumina pre-adsorbs potassium ions to form an adsorption layer, and the adsorption layer and anions existing in the electrolyte form a double-electrode layer, so that the interface reaction is accelerated, and the crystallinity of NaF is further improved; and thus, the cycle life and the rate capability of the battery are improved.

The present invention relates to a method for treating an aqueous effluent, said effluent comprising: - a metal chosen from the list consisting of copper, zinc, nickel, chromium, tin, aluminum, iron, cobalt, silver, gold, palladium and rhodium, alone or in combination, - a salt comprising an anion chosen from the list consisting of sulfate, chloride, nitrate, fluoride, sulfamate, acetate, carbonate, citrate, cyanide, hydroxide, nitrite, oxide and phosphate alone or in combination, and a cation chosen from the list consisting of calcium, sodium, potassium, ammonium, quaternary ammonium, iron, magnesium, pyridinium and lithium alone or in combination, the method comprising a step a) of bringing said effluent into contact with at least one alumina-based solid, said solid being obtained by a method comprising the following steps: i) abruptly dehydrating by flashing an aluminum hydroxide or an oxyhydroxide aluminum,to obtain an active alumina powder; ii) the active alumina powder obtained in step i) is shaped so as to obtain a solid in the form of a ball or extrudate; iii) the solid obtained in step ii) is heat treated; iv) the heat-treated solid obtained in step iii) is hydrothermally treated; v) the treated solid obtained in step iv) is calcined.,

A one-component powder coating composition is provided comprising a curable resin and one or more curing additives for curing the curable resin, wherein the powder coating composition comprises: one powder coating component comprising the curable resin and the one or more curing additives; and 1.0 to 20 wt % of a dry-blended inorganic particulate additive consisting of inorganic components i), ii), and iii), wherein component i) is non-coated aluminium oxide or non-coated silica, component ii) is aluminium hydroxide and / or aluminum oxyhydroxide, and component iii) is silica, and wherein the powder coating component has a particle size distribution with a Dv90 of at most 50 μm and a Dv50 of at most 30 μm.

A particulate inorganic material equipped with elemental silver and elemental ruthenium, said inorganic material having an average particle size (d50) in the range of 50 nm to 40 μm and a BET surface area in the range of 1 to 1600 m2 / g. The inorganic material as such is selected from the group consisting of aluminum nitride, titanium nitride, silicon nitride, corundum, titanium dioxide in the form of anatase, titanium dioxide in the form of rutile, pyrogenic silica, precipitated silica, sodium aluminum silicate, zirconium silicate, zeolite, hydrotalcite and gamma-aluminum oxide hydroxide.

The invention discloses a heat-resistant anticorrosive coating for an alloy, a preparation method and a use method, and belongs to the technical field of anticorrosive coatings. The coating comprises the following components in parts by weight: 25-42 parts of epoxy resin, 18-30 parts of phenolic resin, 10-15 parts of a polycarbonate-rubber-inorganic filler ternary compound, 1-5 parts of a curing agent, 3-5 parts of aluminum hydroxide, 5-10 parts of flaky mica powder and 30-50 parts of a solvent. A brand-new anticorrosive coating system is constructed, a layer of tough and compact protective film can be formed on the alloy surface, a corrosive medium is effectively isolated, and the anticorrosive coating still has an excellent protective effect in a severe environment with changeable conditions.

The application discloses an alloy heat-resistant anticorrosive paint, a preparation method and a use method, and belongs to the technical field of anticorrosive paints. The alloy heat-resistant anticorrosive paint comprises the following components in parts by weight: 25-42 parts of epoxy resin, 18-30 parts of phenolic resin, 10-15 parts of a polycarbonate-rubber-inorganic filler ternary compound, 1-5 parts of a curing agent, 3-5 parts of aluminum hydroxyl oxide, 5-10 parts of flaky mica powder and 30-50 parts of a solvent. The application constructs a brand-new anticorrosive paint system, which can form a tough and dense protective film on the surface of an alloy, effectively insulates corrosion medium, and still has excellent protection efficacy in a harsh environment with variable conditions.

The invention discloses a lithium battery composite membrane and a preparation method thereof, and belongs to the technical field of lithium batteries, the composite membrane comprises a base membrane and a coating layer coated on one side or two sides of the base membrane; slurry of the coating layer is obtained through graft copolymerization of EVA, polyamic acid and aluminum oxide, the EVA is hydrolyzed to generate hydroxyl, the aluminum oxide is modified by amino silane to introduce amino, and then the aluminum oxide is subjected to graft copolymerization with the polyamic acid. According to the invention, combination of PI, EVA and alumina is realized through graft copolymerization, multi-component molecular-level compounding is realized, the cost is reduced, and the EVA has low density, so that the mass of a coating layer can be reduced, and the influence on the energy density of a battery is reduced. Based on the combination of a rigid material of PI and aluminum oxide and an EVA flexible material, the provided diaphragm is more tightly attached to a positive electrode material and a negative electrode material, the thermal stability and the mechanical property of the diaphragm are enhanced, and the electrolyte wettability of the diaphragm is good.

The application discloses a preparation method of sintered artificial marble, and comprises the following steps: (1) preparation of fillers; (2) preparation of glaze; (3) preparation of artificial marble blank; (4) coating of glaze; (5) sintering, cooling, polishing and modification of the artificial marble blank with surface glaze obtained in the step (4), so as to obtain the sintered artificial marble. The preparation method of the sintered artificial marble can enhance the glaze surface of the artificial marble by using the water bath heating synthesized sodium fluoride nano-silicon dioxide and hydroxyl aluminum oxide modified graphene oxide composite material, and can significantly improve the compactness and scratch resistance of the surface of the artificial marble; the nano-silicon dioxide can well compensate the holes on the surface of the glaze of the artificial marble; the fibrous hydroxyl aluminum oxide and the layered graphene oxide are in synergistic effect, and after sintering, the hydroxyl aluminum oxide and the graphene oxide are tightly connected to form a network structure in the glaze, so that the compactness and hardness of the glaze are improved, and the friction resistance and scratch resistance of the surface of the artificial marble are enhanced.

This invention relates to a method for calculating the crystallinity of aluminosilicate adjuvants based on XRD peak shape weighting analysis, belonging to the field of materials analysis technology. The method includes: loading raw XRD data and defining the analysis range; performing baseline correction using the asymmetric least squares method; finding peaks based on standard peak positions and determining the full width at half maximum (FWHM) based on the actual peak centers using Gaussian fitting; calculating the contribution weight of each diffraction peak to crystallinity based on the FWHM using a weighting function, where a smaller FWHM indicates a higher weight; calculating the weighted area of ​​each peak and the total integral area of ​​the corrected spectrum; and finally calculating the percentage of crystallinity based on the ratio of the weighted total area to the total area. This invention, by introducing peak shape weighting analysis, quantifies the impact of diffraction peak broadening on crystallinity assessment, significantly improving the reliability of aluminosilicate adjuvant crystallinity calculation and providing a solution suitable for high-throughput calculation of aluminosilicate crystallinity.

The invention relates to the technical field of lithium ion batteries, and discloses a composite binder which comprises an inorganic substance and a latex polymer. The inorganic matter comprises an inorganic nanometer network formed by hydroxyl aluminum oxide and / or silicon dioxide; the latex polymer comprises a block copolymer or a graft copolymer, and the block copolymer or the graft copolymer comprises a microphase separation structure of a soft segment and a hard segment. Therefore, a rigid-tough double network can be constructed under a water system condition, so that the bonding strength, the swelling inhibition property and the thickness conduction are effectively balanced. The invention further discloses a positive pole piece, a preparation method of the positive pole piece and a lithium ion battery.

There is provided a catalyst article for treating an exhaust gas comprising NOx, the catalyst article comprising a catalyst composition disposed on a substrate, the catalyst composition comprising: a copper-loaded molecular sieve; and a binder comprising a manganese-doped aluminium hydroxide oxide and / or a manganese-doped alumina.

The invention discloses a fluorine recovery method and recovery device adaptive to high and low fluorine-containing wastewater, and the method is characterized in that free switching between a calcium fluoride homogeneous crystallization mode and a calcium fluoride heterogeneous crystallization mode of the fluorine-containing wastewater is realized by adjusting the dosage and reaction time of calcium salt and polyaluminum chloride, so that the fluorine recovery method can be adaptive to fluorine recovery of wastewater with different fluorine concentrations; afterwards, calcium fluoride crystal products and hydroxyl aluminum oxide flocs are finally obtained through solid-liquid separation, alkalization treatment, acidification treatment and other means, and the hydroxyl aluminum oxide flocs are recycled. According to the method disclosed by the invention, the fluorine in the wastewater with different fluorine concentrations can be recovered by combining the calcium salt and the polyaluminum chloride, and the method is simple in process equipment, simple and convenient to operate, low in cost and high in purity of the recovered product.

The invention discloses a preparation method of an isoelectric point controllable hydroxyl alumina nano adjuvant based on carboxyl modification. The method is based on chemical synthesis, and the purpose of controlling the isoelectric point of the hydroxyl alumina adjuvant is finally achieved by changing the carboxyl modification amount on the surface of the hydroxyl alumina adjuvant. The method disclosed by the invention is simple to operate, the stability and repeatability of a reaction product are good, the isoelectric point of the hydroxyl alumina adjuvant can be controlled between 4 and 10, and the method has a good application prospect in the fields of vaccine adjuvants and the like.