63 results about "Zirconium nitrate" patented technology

The invention provides a preparation method and application of a plasma-assisted catalyst for preparing methanol through CO2 hydrogenation, and belongs to the field of catalysts. Raw materials adopted by the method comprise biomass, metal salt and a precipitator, the molar ratio of the biomass to the metal salt is (0.05-1): 1, the biomass is one of chitosan, hyaluronic acid and alginic acid, and the metal salt is one or more of indium nitrate, cobalt nitrate, zirconium nitrate, zirconyl nitrate, titanium sulfate and aluminum nitrate; the catalyst is subjected to nitrogen doping and / or more oxygen vacancy metal interfaces are formed through combination of coprecipitation and plasma treatment, so that the carbon dioxide adsorption and activation capacity and the overall hydrogenation efficiency of the catalyst in the process of preparing methanol through carbon dioxide hydrogenation are effectively improved.

The present application relates to the technical field of catalyst production, in particular to a preparation method of a high-selectivity and high-stability methanol synthesis catalyst, comprising the following steps: step 1: dissolving zirconium nitrate, zinc nitrate and aluminum nitrate in water to form a zirconium-zinc-aluminum mixed salt solution A, dissolving zinc nitrate, aluminum nitrate and copper nitrate in water to form a copper-zinc-aluminum mixed salt solution B, dissolving sodium carbonate in water to form alkali solution C and alkali solution D; adding a small amount of alkali solution C into deionized water to form deionized water E; step 2: using the salt solution A, the alkali solution C and the deionized water E to form a precipitate 1, then using the salt solution B, the alkali solution D and the precipitate 1 to react to form a precipitate 2, then heating the precipitate 2, and aging the precipitate 2; step 3: after aging, filtering and washing the precipitate 2, drying the filter cake obtained by filtering, and then calcining and molding to obtain the methanol synthesis catalyst.

The application relates to a CuO-ZnO-ZrO2@CeO2 core-shell catalyst and a preparation method and application thereof in preparing methanol. The preparation method is as follows: copper nitrate and zinc nitrate are dissolved in deionized water to form a mixed solution, a precipitant is added, and hydrothermal reaction is carried out to obtain copper-zinc nanoscale dispersed particles; then the particles are dispersed in deionized water, a zirconium nitrate aqueous solution is added, and hydrothermal reaction is carried out to precipitate zirconium on the outer layer of the particles; then a cerium nitrate aqueous solution and a precipitant are added to the system, and hydrothermal reaction is carried out; after the reaction, the system is subjected to filtration, washing, drying, grinding and calcination to obtain the CuO-ZnO-ZrO2@CeO2 core-shell catalyst. In the application process, CO2 and H2 are used as raw materials, cyclohexanol is used as a solvent, hydrogenation reaction is carried out under the action of the core-shell catalyst at 190-210 DEG C, and methanol is prepared. The core-shell catalyst can be applied to hydrogen transfer hydrogenation for preparing methanol, and can exhibit excellent catalytic activity and stability and higher methanol selectivity.

The invention relates to the technical field of denitration catalyst regeneration, in particular to a preparation method of a regenerated denitration catalyst based on a reconstructed bulk phase carrier. The preparation method comprises the following steps: carrying out ultrasonic treatment on the waste catalyst by using an ethylenediamine tetraacetic acid-hydrofluoric acid mixed solution to realize targeted detoxification; carrying out hydrothermal reaction on the detoxified carrier, titanium sol, cerous nitrate and zirconium nitrate, and roasting with nitrogen to complete bulk phase reconstruction; carrying out microwave-assisted gradient loading on ammonium paratungstate and an ammonium metavanadate-oxalic acid solution on the reconstructed carrier to obtain a precursor; and roasting and activating the precursor in a gradient atmosphere to obtain the regenerated catalyst. The catalyst prepared by the invention has high denitration efficiency, excellent sulfur poisoning resistance stability, good circulation performance and long service life, can realize efficient regeneration of the waste vanadium-titanium-based denitration catalyst, is suitable for the field of industrial flue gas denitration, and has significant application value.

The invention belongs to the technical field of catalyst carriers, and particularly relates to a preparation method of a high-strength catalyst carrier, which comprises the following steps: S1, preparing a precursor; the preparation method comprises the following steps: dissolving ferric nitrate-zirconium nitrate composite salt, 2, 5-dihydroxy terephthalic acid and a monatomic Fe source in N-methyl pyrrolidone according to the ratio of the total molar weight of metal ions to the volume of N-methyl pyrrolidone of 1mmol: 5.6 mL, and reacting at 150 DEG C to form monatomic Fe-doped Fe-Zr-MOFs seed crystal; adding a reaction monomer and a protonic acid catalyst into the system, and heating to 170 DEG C for reaction; centrifuging after cooling, and carrying out gradient elution treatment and vacuum drying to obtain a precursor; s2, putting the precursor obtained in the step S1 into a mixed atmosphere tube furnace, introducing 12 vol% H2 / N, raising the temperature to 550 DEG C at 7 DEG C / min, and keeping the temperature for 3 hours; then introducing 9vol% SiH / Ar, raising the temperature to 1000 DEG C at the speed of 10 DEG C / min, and keeping the temperature for 6 hours; and cooling to obtain the low-magnetization carbon heterogeneous matrix.

The application relates to a preparation method of a high-temperature-resistant high-space-velocity VOCs catalytic combustion catalyst for acid ester waste gas and the catalyst, and belongs to the field of industrial waste gas treatment. The catalyst takes noble metal, transition metal oxide and rare earth oxide as active components, takes honeycomb ceramic or metal honeycomb as a carrier, and is prepared by adopting a coating process. First, Ce x Zr 0.6‑x La y Pr 0.1‑ y O2 is prepared by using lanthanum nitrate hexahydrate, praseodymium nitrate hexahydrate, cerium nitrate hexahydrate and zirconium nitrate pentahydrate; then, La-Al2O3 is prepared by using lanthanum nitrate hexahydrate and Al2O3 through an equal-volume impregnation method; and finally, the catalyst is prepared by using Ce x Zr 0.6‑x La y Pr 0.1‑ y O2, La-Al2O3 and noble metal. The catalyst has the characteristics of high low-temperature activity, good thermal stability and high purification efficiency for catalytic combustion of volatile organic compounds of acid esters at high space velocity.

The invention relates to the technical field of inorganic porous materials, and particularly discloses a preparation method of pseudo-boehmite for chloromethane. The preparation method comprises the following steps: S1, adding sodium-free aluminum salt, zirconium nitrate pentahydrate and tetrabutyl titanate into a mixed solvent, adding a complexing agent, then adding nano boehmite, uniformly mixing, firstly adjusting the pH value to 7.5-8.0, heating to 25-35 DEG C, mixing, then adjusting the pH value to 5.5-6.0, and mixing to obtain uniform sol; s2, urea and ammonium bicarbonate are mixed and dissolved in water, ammonium zirconium carbonate is added, and a mixed solution B is obtained; and S3, adding the mixed solution B into the uniform sol, uniformly mixing, carrying out gradient heating reaction, and then carrying out solid-liquid separation, washing and drying to obtain the pseudo-boehmite for chloromethane. The prepared pseudo-boehmite for chloromethane has the advantages of extremely low sodium content, high specific surface area and excellent thermal stability.

The invention discloses a copper-based catalyst for synthesizing methanol from CO2 and a preparation method of the copper-based catalyst. The copper-based catalyst comprises the following components: a) sodium metaaluminate; b): hexadecyl trimethyl ammonium bromide; c): aluminum nitrate; d): zirconium nitrate; e): deionized water; f): aluminum sulfate; g): aluminum chloride; h): copper nitrate; according to the copper-based catalyst for synthesizing methanol from CO2 and the preparation method of the copper-based catalyst, zirconium-doped boehmite is prepared in advance and roasted to obtain zirconium-doped aluminum oxide with hierarchical pores, the zirconium-doped aluminum oxide serves as a carrier and is subjected to deposition and precipitation with the active component copper and zinc, and finally the catalyst which is high in activity and good in stability in the CO2 hydrogenation reaction is obtained. The zirconium-doped alumina carrier obtained by roasting zirconium-doped boehmite prepared in advance has hierarchical pores, high specific surface area, high-temperature stability and sintering resistance, is beneficial to uniform dispersion of copper-zinc active components, enhances the stability of the copper-zinc active components, inhibits migration and aggregation of the copper-zinc active components, and prolongs the service life of the catalyst.

The application discloses an anti-sintering methanol cracking catalyst and a preparation method thereof, and belongs to the field of hydrogen production by methanol cracking catalysis. The anti-sintering methanol cracking catalyst comprises the following raw materials in parts by weight: strontium nitrate 1.8-3 parts, titanium nitrate 6.3-10.5 parts, a Cu active carrier 58-70 parts and polyvinyl alcohol 2-5 parts. The Cu active carrier comprises the following raw materials in parts by weight: copper acetate 12-21 parts and a Zr-HAP-P2O7 carrier 51-60 parts. The Zr-HAP-P2O7 carrier comprises the following raw materials in mole fractions: calcium nitrate 19-22 parts, zirconium nitrate 1.8-2.5 parts, ammonium dihydrogen phosphate 18 parts and sodium pyrophosphate 1.4-1.7 parts. The methanol cracking catalyst provided by the application has strong anti-sintering capacity, can effectively prevent the generation of carbon deposition and prolong the service life of the catalyst.

The application provides a preparation method of silica-stabilized lanthanum zirconate aerogel, and comprises the following steps: using lanthanum nitrate hexahydrate and zirconium nitrate pentahydrate as precursors, and using propylene oxide as a catalyst to obtain an LZ sol in anhydrous ethanol solvent; using tetraethyl orthosilicate as a precursor, and using hydrochloric acid as a catalyst to carry out hydrolysis in an ethanol and water solvent to obtain an SiO2 sol; dropping the obtained SiO2 sol into the LZ sol drop by drop to obtain a mixed solution, and dropping the mixed solution into propylene oxide gel promoter drop by drop to obtain an LZS sol; the LZS sol is placed in an oven to obtain an LZS gel; and the LZS gel is subjected to aging and supercritical drying to obtain a blocky LZS aerogel. The silica-stabilized lanthanum zirconate aerogel has a unique pyrochlore structure and good thermal stability, and has a very large application prospect in the field of heat preservation and insulation.

The application discloses a kind of low-temperature denitration catalysts of water resistance, sulfur resistance and alkali resistance and a preparation method thereof, and belongs to the technical field of catalyst materials.The preparation method comprises the following steps: ammonium metavanadate and ammonium dihydrogen phosphate are added to monoethanolamine and a small amount of water to stir and dissolve, obtaining solution 1; cerium nitrate is added to deionized water to dissolve, obtaining solution 2; solutions 1 and 2 are mixed uniformly to obtain solution 3; ammonium metatungstate and ammonium heptamolybdate are added to deionized water to dissolve and then added to solution 3, obtaining solution 4; titanium white, zirconium nitrate and silicon dioxide powder are mixed uniformly and added to solution 4 to stir uniformly, while a certain amount of lactic acid, glass fiber and boric acid are added, obtaining uniform slurry; drying; calcination, and the process is completed.The beneficial effects are as follows: the prepared catalyst can achieve a denitration efficiency of more than 90% in a low-temperature range of 160-220°C, and the catalyst has high strength, resistance to 6% water poisoning, 3% alkali poisoning and 400ppm sulfur poisoning.

The invention relates to a Zr-doped Ru-based acidic oxygen evolution reaction catalyst and a preparation method thereof, and belongs to the technical field of electro-catalysis. Firstly, ruthenium chloride trihydrate and zirconium nitrate pentahydrate serve as raw materials, a precursor is loaded on the surface of a pretreated titanium mesh through a dispensing method, and then RuZrOx grows on the surface of the titanium mesh in situ through a one-step pyrolysis method to form the nanosphere composite catalyst. The introduction of the Zr element can provide extra electrons for the Ru center, stabilize the valence state of the Ru center, prevent Ru from being peroxidized and generate high-valence soluble oxidized Ru, meanwhile, different ion radiuses of Zr ions and Ru ions induce controllable lattice distortion, the electronic structure of Ru sites in the catalyst and the adsorption energy of the Ru sites to oxygen intermediates are optimized, and the catalytic activity of the catalyst is improved. The catalytic activity and the stability of the material are obviously improved; the preparation method of the Zr-doped Ru-based acidic oxygen evolution reaction catalyst is simple in process, low in cost and excellent in performance, and a new thought is provided for design and controllable preparation of an OER catalyst in an acidic environment.

The application belongs to the technical field of atmosphere treatment, and provides a sulfur-poisoning-resistant denitration and carbon monoxide removal SCR catalyst and a preparation method thereof. Part of anatase titanium white, platinum nitrate, ammonium metatungstate and water are first mixed to perform first calcination to obtain a precursor powder; the rest of the anatase titanium white, clay, stearic acid, ammonium heptamolybdate, ammonium metavanadate, glass fiber, cerous nitrate, zirconium nitrate and water are second mixed to obtain a slurry; the slurry, the precursor powder, carboxymethyl cellulose ammonia and polyoxyethylene are mixed, and after the pH value is adjusted to be alkaline, kneading and aging are sequentially performed to obtain an aged slurry; the aged slurry is sequentially subjected to extrusion molding, drying and second calcination to obtain the SCR catalyst. The obtained SCR catalyst can efficiently remove nitrogen oxides and carbon monoxide, and also has excellent sulfur-poisoning resistance.

The invention discloses a metal monolithic catalyst for fuel reforming of a Stirling engine and a preparation method of the metal monolithic catalyst. The method comprises the following steps: performing in-situ oxidation on a FeCrAl honeycomb metal matrix at 950 DEG C to form an Al2O3 nano whisker layer with the diameter of 2-5 microns and the length of 10-20 microns; coating gamma-Al2O3 support slurry on the porous support layer in a dip-coating manner to form a porous support layer; alternately dipping in a cerium nitrate solution and a zirconium nitrate solution, and roasting to construct a Ce0. 75Zr0. 25O2 porous functional layer; and a high-dispersion noble metal active layer is loaded according to the molar ratio of Pt to Rh being 1: 1. The obtained catalyst has high interface bonding strength, high specific surface area and excellent mass and heat transfer performance, can realize high diesel conversion rate and high hydrogen selectivity under the working condition of high-temperature and high-pressure reforming, and shows good carbon deposition resistance and stable operation capability.

The application provides a preparation method of a delayed crosslinking agent and an acid fracturing fluid, and the method comprises the following steps: carrying out a chelation reaction on a transition metal substance and a ligand substance in a solvent to obtain the delayed crosslinking agent; the transition metal substance is a zirconium source and a titanium source, the zirconium source is one or more of zirconium nitrate, zirconium sulfate and zirconium oxychloride, and the titanium source is titanium tetrachloride; the ligand substance is at least three of glycerol, lactic acid, triethanolamine, sodium gluconate and sodium citrate; and the mass ratio of the transition metal substance and the ligand substance is 1:1-10. The acid fracturing fluid mainly comprises hydroxypropyl carboxymethyl guar gum, the delayed crosslinking agent and a pH regulator, and can still achieve the delayed crosslinking effect at high temperatures. The fracturing fluid is an acid fracturing fluid with temperature-controlled viscosity release, has the advantages of high-temperature resistance, temperature-controlled crosslinking, low friction drag and low residue, and is suitable for low-permeability oil and gas reservoirs, and solves the problems of clay swelling and migration and high pipe string friction drag.

The application discloses a control method of a multi-principal-element rare earth doped zirconium oxide thermal barrier coating dendritic structure, and belongs to the field of thermal barrier coatings. The control method comprises the following steps: placing a high-temperature alloy sample with a bonding layer into a first electrolyte, taking the high-temperature alloy sample as a negative electrode, taking a graphite plate as a positive electrode, connecting a micro-arc oxidation power supply, performing first electrolysis, depositing an oxidation-resistant ceramic barrier layer on the surface of the high-temperature alloy sample, then placing the high-temperature alloy sample with the oxidation-resistant ceramic barrier layer into a second electrolyte, taking the high-temperature alloy sample as a negative electrode, taking the graphite plate as a positive electrode, connecting the micro-arc oxidation power supply, and performing second electrolysis. The first electrolyte comprises aluminum nitrate and a rare earth element metal salt, and the second electrolyte comprises zirconium nitrate and a rare earth element metal salt. The process parameter of the application is convenient to adjust, the doping of the rare earth element and the introduction of the oxidation-resistant barrier layer effectively improve the compactness of the dendritic structure coating, and the heat insulation temperature and the thermal shock performance of the dendritic structure coating are improved.

The application discloses an environment-friendly ceramic and a preparation method thereof, and belongs to the field of ceramics. The method comprises the following steps: dissolving zinc nitrate, zirconium nitrate and iron nitrate in a solvent and stirring and mixing to obtain a mixed solution; grinding and mixing kaolin, illite, magnesium oxide, iron titanate, calcium titanate, titanium, silicon powder, carbon powder and aluminum oxide, and adding into the mixed solution to mix to obtain a first slurry; taking the first slurry, adding zinc oxide and iron oxide into the taken first slurry to mix to obtain a second slurry; adding kaolin, zirconium oxide, boron carbide, carbon powder, boron oxide, aluminum, boron, titanium, silicon and titanium dioxide into a dispersing solvent to mix to obtain a third slurry; and performing sintering treatment on the prepared embryo to obtain the ceramic. The ceramic has high mechanical strength, good corrosion resistance, good antibacterial property, is not prone to cracking or damage when the external temperature changes rapidly, has stable overall performance, and has high durability.

An electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the same are provided. The electrolyte solution comprises a first solvent comprising a heterocyclic compound containing one or more double bonds and any one of an oxygen atom or a sulfur atom; a second solvent comprising at least one of an ether-based compound, an ester-based compound, an amide-based compound, or a carbonate-based compound; a lithium salt; zirconium oxynitrate; and lithium nitrate.

The invention provides a preparation method and application of a Cr-series catalyst for propane dehydrogenation, and the preparation method comprises the following steps: (1) mixing pseudo-boehmite, titanium oxide and sesbania gum powder to obtain mixed powder; (2) mixing a first auxiliary agent and a nitric acid solution, stirring and dissolving to obtain a first auxiliary agent solution; (3) in a stirring state, dropwise adding the first auxiliary agent solution into the mixed powder, after dropwise adding, performing kneading and strip extrusion, and then performing vacuum drying and roasting to obtain a carrier; and (4) mixing a chromium-containing compound, a second auxiliary agent and water to obtain an impregnation liquid, adding the carrier into the impregnation liquid for impregnation adsorption, and then performing vacuum drying and roasting to obtain the catalyst, the first auxiliary agent is at least one of zinc nitrate, zirconium oxychloride, zirconium nitrate, urea and ammonium chloride; the second auxiliary agent is at least one of cerous nitrate, manganous nitrate, lanthanum nitrate and aluminum nitrate. The catalyst is excellent in performance, good in regeneration performance and high in propylene product yield.

The application provides a high-efficiency high-flatness silicon carbide fine polishing polishing liquid, which comprises an A agent and a B agent; the A agent comprises an oxidizing agent, a first dispersing agent, a first bactericide, a pH regulator and water; the B agent comprises an abrasive, a second dispersing agent, a second bactericide, a film forming agent, a pH regulator and water; the abrasive is cerium oxide, the oxidizing agent is a compound of potassium permanganate and sodium permanganate, and the film forming agent is zirconium nitrate; the A agent and the B agent are mixed before use, and the pH value of the polishing liquid after mixing is 3-5. The polishing liquid has good synergistic effect of each component, a wide process window, and can effectively solve the technical problems that high removal rate (≥450nm / h), low roughness (Ra<0.5nm) and low defects are difficult to be coordinated in silicon carbide polishing.

The present invention discloses a method for the separation of radionuclides from an aqueous radioactive waste solution, the method comprising: receiving of an aqueous radioactive waste solution, adding at least one zirconium salt to the aqueous radioactive waste solution, changing the pH of the radioactive waste solution to obtain a precipitate P, and separating the precipitate P from the radioactive waste solution. The present invention also discloses the use of zirconium salts, preferably zirconium oxychloride, zirconium nitrate or a zirconium oxynitrate or any mixture thereof, for the treatment of aqueous radioactive waste solution, preferably acidic or alkaline intermediate or low level radioactive waste solution, preferably an acidic intermediate and / or low level radioactive waste solution.

The invention discloses a modified gamma-Al2O3 catalyst as well as a preparation method and application thereof, and belongs to the technical field of industrial catalyst preparation. The invention relates to a preparation method of a modified gamma-Al2O3 catalyst, which comprises the following steps: adding a triblock copolymer into an organic solvent, then adding nitric acid and a precursor, heating and stirring the obtained mixture to react, then heating and evaporating to dryness, and drying and roasting the obtained solid to obtain the modified gamma-Al2O3 catalyst, the metal source is selected from lanthanum nitrate, cerium nitrate or zirconium nitrate. The modified gamma-Al2O3 catalyst synthesized through the one-pot method is used for synthesizing anisole through the oxygen alkylation reaction of phenol and dimethyl carbonate, and has good conversion rate and excellent selectivity.

The application discloses a preparation method and application of a CuZnZr catalyst for carbon dioxide hydrogenation to methanol. Copper nitrate, zirconium nitrate and zinc nitrate are used as raw materials, and sodium carbonate is added drop by drop at a slow rate, and then Cu1-ZrO2 single-atom catalyst, Cu-ZnZrOx catalyst, Cu-ZnO catalyst and Cu-ZnO catalyst and other catalysts with clearly defined active sites are prepared through precipitation, aging, filtration, drying and low-temperature calcination. 0 0 0 The preparation method is simple, safe and highly repeatable, and is suitable for industrial application. Active metal copper species in the obtained catalyst exists in multiple states, metal oxides on the catalyst and metal Cu species have different interaction degrees, and different catalytic reaction active sites are generated. The CuZnZr catalyst contains four clearly defined active sites, and carbon dioxide can be selectively reduced to methanol at low temperature.​​

The present application relates to a kind of preparation methods of chromium-free non-metal tanning high-performance low VOC composite resin, take n-butyl acetate, methyl methacrylate, butyl acrylate, methyl methacrylate-beta-hydroxyethyl acrylate are mixed, n-butyl acetate and azobisdimethylvaleronitrile are added, n-butyl acetate and tert-butyl peroxy-2-ethylhexanoate are added;Take titanium nitrate, vanadium nitrate, zirconium nitrate, naphthalene carboxylic acid and the like are dissolved in N,N-dimethylformamide, cooling, N,N-dimethylformamide is added, filtration;Take high-performance filler, polyhydroxy acrylate prepolymer, polyurethane resin and the like are mixed, and high-performance low VOC composite resin is prepared.The high-performance low VOC composite resin of the present application does not use heavy metal during preparation process, and the high-performance filler has good adsorption performance to heavy metal, which can reduce the soluble heavy metal of coating;After finishing, the finished leather has excellent oil wax feeling, can give leather better oil change effect, and the coating has good physical and mechanical properties and ecological environmental protection performance.

The present application relates to gas adsorption material technical field, especially to Fe-Ce-Zr three metal MOFs derived carbon material and its preparation method and application, the preparation method of the present application takes iron nitrate, cerium nitrate, zirconium nitrate as metal source, phthalic acid as organic ligand, realizes the coordination assembly of metal ion and ligand through the solvothermal method, and prepares Fe-Ce-Zr three metal MOF;Again under argon atmosphere, with 10~12 ℃ / min heating rate, heat to 600~800 ℃, and bake 2~4h, make organic ligand in situ carbonization into porous carbon skeleton, and metal node converts into high dispersion metal oxide, finally obtains the Fe-Ce-Zr three metal MOFs derived carbon material with porous structure, multi-metal active site and carbon matrix.

This invention discloses a method for crystallizing sodium nitrate in the field of inorganic salt crystallization technology. The method involves dissolving sodium nitrate raw material in deionized water and filtering. Magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets anchored with fluorine-containing cerium-zirconium hydroxide-hydrated oxides are added to the filtrate. The mixture is then dispersed under heat, cooled in stages, seeded with sodium nitrate under reduced pressure, evaporated under reduced pressure, crystallized under heat, centrifuged, washed with a saturated sodium nitrate solution, and dried to obtain sodium nitrate crystals. The fluorine-containing cerium-zirconium hydroxide-hydrated oxide-anchored magnesium-aluminum-silicon-boron composite layered oxygen hydroxyl compound nanosheets are obtained through co-precipitation of magnesium, aluminum, cerium, and zirconium nitrates, heat treatment with fluorine-containing water, silicon-boron composite modification, and heat-treated grinding and spray drying. This invention can regulate the nucleation and growth of sodium nitrate crystals, improve crystal particle size uniformity, reduce mother liquor entrainment, and improve crystal separation and drying effects.

The invention discloses a high-strength carbon fiber needled felt and a preparation method thereof, belongs to the technical field of carbon fiber felt processing, and is used for solving the technical problem that the mechanical strength and thermal oxidation resistance of a carbon fiber needled felt in the prior art need to be further improved. Stirring until the system is dissolved, adding PAN-based carbon fibers and asphalt carbon fibers into the reaction system, carrying out ultrasonic dispersion for 20-30 minutes, and adding a sodium hydroxide solution into the reaction system. According to the invention, PAN-based and pitch-based carbon fibers are used as raw materials, ZrO2 is loaded on the surfaces of the fibers, needling is carried out to form a net, boron-modified organic-inorganic hybrid phenolic resin, nano silicon carbide and aluminum oxide are used to reinforce the carbon fiber net, and a compact and stable carbon-ceramic composite structure is constructed. The mechanical strength and the thermal oxidation resistance of the carbon fiber needled felt are obviously improved.

The invention discloses an anti-sintering methanol cracking catalyst and a preparation method thereof, and belongs to the field of methanol cracking catalytic hydrogen production. The anti-sintering methanol cracking catalyst is prepared from the following raw materials in parts by weight: 1.8 to 3 parts of strontium nitrate, 6.3 to 10.5 parts of titanium nitrate, 58 to 70 parts of Cu active carrier and 2 to 5 parts of polyvinyl alcohol, the Cu active carrier is prepared from the following raw materials in parts by weight: 12 to 21 parts of cupric acetate and 51 to 60 parts of Zr-HAP-P2O7 carrier; the Zr-HAP-P2O7 carrier is prepared from the following raw materials in parts by mole: 19 to 22 parts of calcium nitrate, 1.8 to 2.5 parts of zirconium nitrate, 18 parts of ammonium dihydrogen phosphate and 1.4 to 1.7 parts of sodium pyrophosphate. The methanol cracking catalyst provided by the invention has strong anti-sintering capability, can effectively prevent generation of carbon deposition, and prolongs the service life of the catalyst.

The invention belongs to the technical field of voltage-sensitive ceramic material preparation, and particularly relates to multi-element doped ZnO voltage-sensitive ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a gallium source, a nickel source, a zirconium source, aluminum nitrate and a solvent, and adjusting the pH value to 7-8 to obtain a mixed solution; the gallium source comprises gallium nitrate and / or gallium acetate; the nickel source comprises nickel nitrate and / or nickel acetate; the zirconium source comprises zirconium nitrate and / or zirconium acetate; the molar ratio of the gallium source to the nickel source to the zirconium source is (0.2-1.5): (0.5-1.8): (0.2-1); and (2) mixing the mixed solution with the remaining raw materials to obtain a mixture, granulating and forming to obtain a green body, and sintering. The gallium source, the nickel source and the zirconium source are used as raw materials in the form of salt at the same time, the prepared ZnO voltage-sensitive ceramic has large discharge-current capacity, high voltage gradient, low leakage current and low residual voltage ratio, the comprehensive performance meets the ionization protection requirement, for example, the ZnO voltage-sensitive ceramic is used for overvoltage protection of lightning protection insulators and ionization equipment.

The application relates to a preparation method of a UV-resistant, flame-retardant and waterproof polyester resin, wherein n-butyl acetate is taken, methyl methacrylate, butyl acrylate, beta-hydroxyethyl methacrylate and acrylic acid are uniformly mixed; polyhydroxy acrylate prepolymer, neopentyl glycol, dimethylol propionic acid and the like are dissolved in water, ethylene glycol butyl ether, diethanolamine and distilled water are added after uniform mixing; pentaerythritol and benzene-1,2,3,4,5,6-hexacarboxylic acid are uniformly mixed, concentrated sulfuric acid is added drop by drop, and the benzene-1,2,3,4,5,6-hexacarboxylic acid is removed by rotary evaporation; titanium nitrate, zirconium nitrate and hyperbranched polycarboxylic acid ligand are dissolved in N,N-dimethylformamide to obtain high-performance fillers; the high-performance fillers, melamine polyphosphate, high-dispersibility polyester resin and the like are used to prepare the UV-resistant, flame-retardant and waterproof polyester resin. The UV-resistant, flame-retardant and waterproof polyester resin has suitable particle size and dispersing capacity, and has good flame retardancy, anti-yellowing property, flame retardancy, waterproofness, physical and mechanical properties and ecological environmental protection performance.