121 results about "Cerium nitrate" patented technology

The invention discloses a method for preparing a carbon monoxide normal-temperature oxidation catalyst based on electrolytic manganese residues and landfill leachate. The method comprises the following steps: soaking and purifying the electrolytic manganese residues with deionized water to obtain preliminarily purified electrolytic manganese residues; mixing aryl alcohol dehydrogenase, the preliminarily purified electrolytic manganese residues and the landfill leachate, and standing to obtain enzymolysis electrolytic manganese residue slurry; mixing fly ash, red mud and the enzymolysis electrolytic manganese slag slurry, uniformly stirring, drying and grinding to obtain a multi-component composite raw material; placing the multi-component composite raw material in low-temperature plasma equipment for irradiation to obtain a plasma activated composite material; and carrying out hydrothermal reaction on the plasma activated composite material to obtain a hydrothermal structure composite material, dipping the hydrothermal structure composite material in a solution containing cerium nitrate, drying, and roasting to obtain the carbon monoxide normal-temperature oxidation catalyst. The carbon monoxide normal-temperature oxidation catalyst with high activity and high moisture resistance is prepared by utilizing industrial wastes and landfill leachate enzymolysis derivative liquid.

The invention discloses a preparation method of an iron-doped cerium-based perovskite type high-selectivity Cu ion capture stabilizing agent and application of the stabilizing agent in heavy metal pollution remediation, and the stabilizing agent is prepared through a sol-gel method and comprises the steps that cerous nitrate and citric acid are dissolved in water, and the mixture is heated and stirred to be gel-shaped; standing the gel solution in a drying oven at a constant temperature to obtain a Fe-Ce-PVSK precursor; grinding the precursor into powder, putting the powder into a quartz boat, and calcining in an air atmosphere through a horizontal tube furnace to obtain a product; and finally, washing to be neutral to obtain the iron-doped cerium-based perovskite stabilizing agent. Due to the high oxygen vacancy concentration and rich active sites, the stabilizing agent has high selectivity and high adsorption capacity and has specific capturing capacity on Cu < 2 + >. The preparation method has mild reaction conditions. The stabilizing agent can effectively reduce the bio-availability of heavy metals in a polluted matrix, promote healthy growth of plants, and realize pollution restoration and ecological function recovery at the same time.

The invention relates to the technical field of high-performance polyester, and discloses a modified preparation method of functionalized antibacterial polyester fibers, which comprises the following steps: S1, graphene is treated by oxygen-argon mixed plasma to obtain hydroxylated graphene; s2, after hydroxylated graphene is dispersed, cerium nitrate and sodium citrate are added, and cerium-based metallized graphene is obtained; s3, carrying out a reaction on the cerium-based metallized graphene and 3-(2-aminoethylamino) propyltrimethoxysilane, so as to obtain aminated graphene; s4, aminated graphene dicyandiamide, ammonium chloride tetraethoxysilane and hexadecyl trimethyl ammonium bromide are subjected to a reaction, and guanidyl-meso-porous silicon-metal composite graphene is obtained; s5, reacting the product with epsilon-polylysine and polycaprolactone to obtain a modified composite antibacterial agent; s6, treating the polyester fibers with a mixed solution of alkali and a surfactant; s7, the polyester fibers react with a solution containing an antibacterial agent, tetrabutyl titanate, an initiator and a dispersing agent, and a finished product is obtained.

This invention belongs to the field of catalyst technology, providing a CO purification oxygen-rich catalyst, its preparation method, and its application. The preparation method involves dispersing γ-alumina in water, then sequentially adding copper nitrate and cerium nitrate to obtain a reaction solution. The reaction solution is mixed with an inorganic base, followed by a substitution reaction and a crystallization reaction to obtain a catalyst precursor. The catalyst precursor is calcined under a reducing atmosphere to obtain the CO purification oxygen-rich catalyst; the reducing atmosphere includes hydrogen. This preparation method generates sufficient active sites through a copper-cerium binary system, and then utilizes the basic groups provided by the inorganic base to form a low-valence metal-hydroxyl composite structure under a reducing atmosphere. Through the combined action of metal atoms, hydroxyl groups, and active oxygen sites, the research goals of high efficiency, stability, high selectivity, and economy are achieved. Furthermore, this preparation method does not use precious metals, resulting in low cost.

The application relates to the technical field of magnetic materials, in particular to a preparation method of high-performance heavy-rare-earth-free neodymium iron boron magnets; the preparation method comprises the following steps: rapidly quenching a main phase alloy into a flake, obtaining coarse powder after hydrogen breaking; immersing the coarse powder in an ethanol mixed solution containing lanthanum nitrate and cerium nitrate, drying the pretreated coarse powder after ultrasonic-magnetic stirring cooperative treatment; adding an antioxidant and a lubricant into the pretreated coarse powder, preparing fine powder with an average particle size of 2-3.5 microns through airflow milling; performing magnetic field orientation compression molding on the fine powder under nitrogen protection, improving the density through cold isostatic pressing; finally, performing vacuum sintering and step-by-step tempering treatment to obtain the high-performance heavy-rare-earth-free neodymium iron boron magnets; wherein the main phase alloy is composed of the following components with mass percentage: 28-31wt.% Pr25Nd75, 0.88-1.2wt.% B, 0-0.1wt.% Al, 0.05-0.3wt.% Ti, 0.05-0.4wt.% Cu, 0.5-1.4wt.% Co, 0.1-0.4wt.% Ga, and the balance is Fe; the prepared neodymium iron boron magnet has the dual characteristics of high coercivity and high remanence, and effectively guarantees the performance and quality.

The invention relates to the technical field of ultraviolet shielding materials, in particular to a preparation method of an attapulgite-loaded cerium metal polyphenol network composite material and ultraviolet shielding application of the attapulgite-loaded cerium metal polyphenol network composite material. The preparation method comprises the following steps: mixing attapulgite with deionized water, and performing ultrasonic dispersion; mixing tea polyphenol and cerous nitrate, adding the mixture into the obtained attapulgite suspension, adding a sodium hydroxide solution, putting the mixture into an ultrasonic kettle, and carrying out ultrasonic treatment; and centrifuging and freeze-drying to obtain the attapulgite loaded cerium metal polyphenol network nano composite material. The attapulgite loaded cerium metal polyphenol network composite material obtained by the invention has a relatively high specific surface area after ultrasonic treatment, the cerium metal polyphenol network is uniformly distributed on the surface of the attapulgite in the form of nanoparticles, and the self-agglomeration phenomenon of the attapulgite is improved by the steric hindrance effect of the cerium metal polyphenol network; and the whole material shows good ultraviolet shielding performance.

The application provides a variable-price rare earth element doped black titanium dioxide catalyst and a preparation method and application thereof, and belongs to the technical field of environmental functional materials and water pollution treatment. The catalyst is prepared by a sol-gel method combined with calcination in a hydrogen-argon mixed atmosphere, with tetrabutyl titanate as a titanium source and lanthanum nitrate and cerium nitrate as rare earth doping sources. Lanthanum / cerium doping can effectively inhibit the generation of rutile phase in the black titanium dioxide, increase the specific surface area, narrow the band gap and construct oxygen vacancy defects, and significantly improve the photocatalytic activity. The preparation process is simple, the cost is controllable, the catalyst has a remarkable selective degradation effect on specific dyes, and an efficient solution is provided for dye wastewater treatment.

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.

This invention discloses a nickel or nickel oxide-supported cerium dioxide-doped lithium aluminum hydride hydrogen storage material, prepared by mechanical ball milling of a supported sample and lithium aluminum hydride. The supported sample is obtained by calcining a precipitate formed by mixing nickel nitrate as the nickel source and cerium nitrate as the cerium source with sodium hydroxide solution in a certain weight ratio and heating. The supported sample is either nickel-supported cerium dioxide or nickel oxide-supported cerium dioxide, named Ni@CeO2 and NiO@CeO2, respectively. The preparation method includes: step 1) preparation of nickel or nickel oxide-supported cerium dioxide; step 2) preparation of the nickel or nickel oxide-supported cerium dioxide-doped lithium aluminum hydride hydrogen storage material. For application in the field of hydrogen storage, the final system's hydrogen release temperature is reduced to 63.9 to 93.5℃, the hydrogen release amount reaches 6.7 to 7.1 wt%, and the hydrogen release rate is 88.94 to 96.03%. This invention achieves improved hydrogen storage material performance at lower temperatures.

The present application relates to the technical field of waste gas purification treatment, in particular to a kind of thermal induction self-activation volatile heavy metal control material of waste gas and its preparation method and application, the control material is composed of the microcapsule of inner core, intermediate layer and shell;Wherein the inner core is the sodium alginate-polyvinyl alcohol microcapsule containing ferrous sulfide, graphene and sodium bicarbonate, the intermediate layer is calcium sulfate isolation layer, and the shell is manganese dioxide, cerium nitrate oxide layer.The material prepared in the application can realize thermal induction self-activation reaction at high temperature, by generating elemental sulfur, iron oxide, manganese oxide and cerium oxide and other active components, simultaneously and efficiently remove volatile heavy metals such as mercury, arsenic, thallium and other volatile heavy metals in waste gas, with the advantages of multifunctional synergy, high heavy metal removal rate, good selectivity, fast response rate and the like.

The invention relates to a preparation method of a novel corrosion-resistant coating for a metal material, and belongs to the technical field of metal corrosion-resistant coatings. The preparation method comprises the following steps: sequentially adding 3, 3-diamino-4, 4-dicarboxyl biphenyl and cerous nitrate into a reaction kettle with a mixed solvent, carrying out ultrasonic treatment and heating reaction, distilling to remove the mixed solvent, and cooling to room temperature to obtain a cerium-containing precursor; the preparation method comprises the following steps: adding epoxy resin and epoxy cyclohexyl-polyhedral oligomeric silsesquioxane into solvent oil, then adding a cerium-containing precursor, carrying out a heating reaction, and carrying out ultrasonic treatment; continuously adding a curing agent, and stirring to obtain the novel corrosion-resistant coating. Coating the cleaned metal hook by using a dip-coating method, and drying at room temperature; the novel corrosion-resistant coating prepared by the preparation method disclosed by the invention is good in humidity and heat resistance and excellent in corrosion resistance.

The invention discloses a hydroxyapatite-cerium oxide composite material preparation method, which comprises: (1) preparing octahedral cerium oxide: dissolving a certain amount of cerium nitrate in deionized water, and stirring for 1 h in a nitrogen atmosphere; the preparation method comprises the following steps: in a nitrogen atmosphere, dropwise adding a certain amount of alkali liquor into a cerium nitrate solution at a certain speed, carrying out hydrothermal reaction, washing, centrifuging, drying and calcining to obtain octahedral cerium oxide; (2) dispersing calcium salt and octahedral cerium oxide in a certain amount of deionized water, vigorously stirring for a period of time, evaporating water in the system, re-dispersing the solid in the deionized water, fully mixing with the ammonium dihydrogen phosphate solution, controlling the pH value of the mixed solution to be 7-12, stirring for a certain time at a certain temperature, filtering, washing and drying to obtain the octahedral cerium oxide. And washing and centrifugally drying to obtain the hydroxyapatite-cerium oxide composite material. The hydroxyapatite-cerium oxide composite material prepared by the invention is high in activity and good in dispersity, can obviously improve the polishing rate of silicon dioxide, and has a relatively high application prospect.

The invention provides a cerium-based metal organic framework as well as a preparation method and application thereof, the cerium-based metal organic framework is obtained by uniformly mixing a cerium salt solution and a regulator, then carrying out a primary microwave heating reaction, then adding a ligand, carrying out a secondary microwave heating reaction, and then washing and drying, the cerium salt is ceric ammonium nitrate, and the ligand is cerium nitrate. The ligand is terephthalic acid, and the regulator is acetic acid. According to the method, the UiO-66 (Ce) with bionic Lewis acid sites is designed through microwave-assisted heating and by utilizing acetic acid to regulate the local chemical environment of the UiO-66 (Ce), so that the activity of hydrolase is greatly improved, a large number of oxygen vacancies can be induced, the activity of oxidase is improved, efficient degradation of glyphosate is realized, and the method has a wide application prospect in the aspects of glyphosate hydrolysis and detection.

The application provides a synthesis method of active piperidone alkaloid, and the active piperidone alkaloid is Dysidone A. The raw material piperidine is used as a substrate, and the substrate is reacted with p-methoxy benzyl chloride under the condition of N,N-diisopropylethylamine, so that the secondary amine is protected, and the side reaction of sodium hydride and hydrogen on the secondary amine is avoided. Then, the secondary amine is oxidized under the condition of iodine and iodobenzenediacetic acid. Next, the secondary amine is reacted with triethyl phosphine acetic acid ester to obtain an alpha, beta unsaturated ester. Then, the p-methoxy benzyl protection is removed by using ammonium cerium nitrate in a mild and efficient manner. Finally, the ester is reduced into an alcohol by using diisobutylaluminum hydride. The piperidone alkaloid or the like is obtained through five reaction steps. The synthesis process is simple, the raw material is cheap and easy to obtain, the cost is low, the reaction condition is relatively mild, the purity is high, and the method has good economic and social benefits.

The present application belongs to the technical field of tire manufacturing, and particularly relates to an antiskid tire and a preparation method thereof. The antiskid performance of the tire is significantly improved by adding cerium-doped polyoxometalate-based layered compounds and nitrogen-sulfur co-modified zirconium-based MXene layered compounds in the tread compound. The cerium-doped polyoxometalate-based layered compounds are prepared by hydrothermal reaction and calcination treatment using disodium hydrogen phosphate, sodium molybdate, cerium nitrate and hexanediamine as raw materials. The nitrogen-sulfur co-modified zirconium-based MXene layered compounds are prepared by etching, peeling and co-calcination with thiourea after synthesizing ceramics using titanium powder, aluminum powder, zirconium powder and carbon powder as raw materials. When preparing the tire, the rubber is first mixed with carbon black, the two modified compounds and the additives to obtain a masterbatch, then the vulcanization system components are added to obtain a final rubber compound, and finally the finished product is obtained through extrusion, lamination and vulcanization molding. The antiskid tire prepared by the present application has excellent grip on wet and icy road surfaces.

The invention relates to a preparation method and application of zinc / cerium double-doped resveratrol carbon dots, resveratrol is used as a carbon source, cerous nitrate is used as a doping agent, and the zinc / cerium double-doped resveratrol carbon dots Zn / Ce-RCDs are synthesized in one step through a controllable hydrothermal method. The prepared zinc / cerium double-doped resveratrol carbon dots Zn / Ce-RCDs have high biocompatibility, antioxidant activity and excellent vascular regeneration promoting performance, and can be used as a biological material or medicine for promoting vascular regeneration.

The present application relates to the technical field of welding material, in particular to a high-toughness gas shielded welding wire and a preparation method thereof.The welding wire comprises a low-carbon steel belt sheath and a flux cored powder, and the flux cored powder comprises reduced iron powder, manganese powder, carbonyl nickel powder, molybdenum powder, titanium powder, silicon powder, graphite powder, rutile titanium dioxide, calcium fluoride, potassium fluorotitanate and cerium-aluminum co-doped microparticle powder; the cerium-aluminum co-doped microparticle powder takes calcium-rich borosilicate as a core, is treated by isopropanol aluminum hydrolysis polycondensation sealing, aluminum oxide nanoparticle enhancement, aluminum nitrate-colloidal silicon dioxide bridging and cerium nitrate outer layer, and is prepared; the welding wire is suitable for high-strength steel thick plate multi-layer multi-pass gas shielded welding, can improve low-temperature impact toughness and refine inclusions while maintaining high deposited metal strength.

The application discloses a kind of synthesis methods of solid phase single-atom catalyst, it is related to catalyst synthesis technical field.The application is after mixing cerium nitrate and manganese nitrate, dissolved in ethanol aqueous solution, obtain solution A;Glycerol and citric acid monohydrate are mixed and dissolved in ethanol aqueous solution, obtain solution B;Solution A and solution B are mixed to form transparent sol;After drying, solid powder is obtained;Solid powder is ball milled and then reduced calcination treatment, then ball milled and then second reduction calcination treatment;Finally, high-temperature calcination and low-temperature calcination treatment are carried out, and solid phase single-atom catalyst is obtained.The solid phase single-atom catalyst prepared by the application has excellent catalytic activity and can improve the denitration efficiency.

The invention relates to the technical field of catalysts, in particular to a cerium oxide-aluminum oxide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing cerous nitrate, aluminum nitrate and water to obtain a mixed solution; the molar ratio of the cerium nitrate to the aluminum nitrate is 10: 1; and adding ammonia water into the mixed solution to carry out coprecipitation reaction, carrying out solid-liquid separation to obtain precursor powder, and calcining to obtain the cerium oxide-aluminum oxide composite material. By selecting raw materials and optimizing preparation steps and process parameters, the prepared catalyst has high activity. The high dispersion of Al2O3 on the carrier CeO2 and a proper crystal structure provide more effective active sites, so that the adsorption and conversion of reactant molecules are promoted. The cerium oxide-aluminum oxide composite material provided by the invention can be used as a catalyst to synergistically purify NOx and CVOCs, and has a matched reaction temperature window for oxidation of CVOCs and reduction of NOx.

This invention relates to an antibacterial medical care pad and its manufacturing process. From top to bottom, it comprises a soft layer, an antibacterial layer, an absorbent layer, and a breathable layer. The antibacterial layer, by weight, comprises the following components: 100 parts polypropylene, 3-8 parts antibacterial powder, and 2-5 parts nanoparticles. The absorbent layer, by weight, comprises the following components: 100 parts acrylic resin, 10-15 parts viscose fiber, 15-20 parts long-staple cotton, and 3-8 parts antibacterial agent. The nanoparticles comprise modified nano-silica and an antibacterial core shell, with a mass ratio of 1:(2-5). The antibacterial core shell comprises the following components: cerium nitrate, lanthanum nitrate, sodium tungstate, and carboxymethyl chitosan. This invention improves the antibacterial performance of the pad by placing an antibacterial layer between the soft layer and the absorbent layer. The addition of an antibacterial agent to the absorbent layer enhances its antibacterial performance, thereby reducing the overall antibacterial performance of the pad. Furthermore, the breathable layer facilitates the timely removal of moisture, reducing patient discomfort.

The invention relates to the technical field of bimetallic catalysts, in particular to a bimetallic catalyst for catalyzing epoxide, which is prepared from the following raw materials: activated carbon, titanium tetrachloride, cobalt nitrate, cerium nitrate, glacial acetic acid and deionized water. The composite material comprises the following components in parts by weight: 80 parts of activated carbon; the proportion of the titanium tetrachloride is 4 parts; the proportion of the cobalt nitrate is 6 parts; the proportion of the cerium nitrate is 10 parts; the proportion of the glacial acetic acid is 20 mL; the proportion of the deionized water is 50 mL, and the glacial acetic acid and the deionized water are additionally added and do not account for the total amount; the method further comprises the following steps: 1, deeply pretreating the activated carbon carrier; 2, preparing an active component solution; step 3, breaking a sol aggregate; step 4, aging and drying; 5, roasting and activating; step 6, forming and screening; the invention aims to solve the problems encountered in the existing material through bimetallic collaborative design, carrier structure regulation and control, load process innovation and roasting system optimization.

The application discloses an oral root canal medicine, a preparation method thereof and application thereof. The oral root canal medicine comprises the following raw materials: a polyelectrolyte, cerium nitrate, nano cerium oxide particles, an oxidizing agent, a metal ion doped agent and a thickening agent, and the pH is adjusted to 7-10. The root canal medicine of the application should be used after tooth root canal preparation and before root canal filling, and is temporarily sealed for one to two weeks after being placed in the root canal. The oral root canal medicine of the application is used for realizing the biomimetic remineralization of the inner wall of the root canal, so that the long-term antibacterial effect in the root canal is achieved. The root canal medicine of the application can realize the complete sealing of the microcavity of the root canal system and the persistent release of the antibacterial component by using the biomimetic mineralization method, and solves the problem that residual microorganisms cannot be completely removed in modern root canal treatment.

This invention relates to the field of automotive reinforcement plate technology, specifically to a corrosion-resistant, high-rigidity right rear shock absorber mounting reinforcement plate and its preparation method. The plate comprises the following raw materials by weight: 100 parts matrix alloy powder, 8-12 parts additive A, 5-9 parts additive B, 3-5 parts graphite powder, 2-3 parts zinc stearate, 3-4 parts polyvinyl alcohol, 0.4-0.6 parts graphite carbon powder, and 0.8-1.5 parts electrolytic copper powder. In this invention, additive A is prepared as a composite additive through a zirconium precursor mixture and a magnesium precursor mixture, forming a uniformly dispersed zirconium-magnesium composite ceramic phase in the iron-based alloy matrix. This effectively refines the alloy grains, strengthens grain boundaries, and improves the stiffness and mechanical strength of the reinforcement plate. Additive B uses a potassium fluorotitanate and cerium nitrate composite treatment solution as its core, combined with polyaniline and sulfosalicylic acid for in-situ film formation, optimizing the sintering interface bonding force and effectively improving corrosion resistance life under salt spray conditions.

The present application relates to the technical field of catalysts, in particular to a preparation method of a rare earth catalyst for petroleum cracking. The preparation method first forms a stable ternary complex solution by reacting lanthanum nitrate and cerium nitrate with bidentate ligand and functional ionic liquid after dissolution; then the solution is mixed with silica-alumina gel formed by a template agent, a silicon source, an aluminum source and a mineralizer, and the catalyst is prepared through hydrothermal crystallization, programmed temperature calcination and other steps. The preparation method realizes the highly uniform dispersion and stable combination of rare earth elements in the molecular sieve carrier through the coordination and hydrogen bond anchoring synergistic effect. The prepared catalyst shows high heavy oil conversion rate, high low-carbon olefin selectivity, excellent hydrothermal stability, outstanding anti-coking and anti-metal poisoning capacity in the petroleum cracking reaction, and has performance advantages and industrial application economy, and is suitable for large-scale petroleum cracking production scenarios.

A preparation method of a rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF comprises the following steps: mixing and dissolving samarium nitrate hexahydrate and H4TBAPy in a composite solvent to form a mixed solution, carrying out a hydrothermal reaction to obtain Sm-MOF, mixing and dissolving ceric ammonium nitrate and Sm-MOF in an aqueous solution of gamma-valerolactone, then adding H2O2 and triethanolamine to form a mixed solution, carrying out magnetic stirring at 45-55 DEG C for 2-3 h, and carrying out hydrothermal reaction to obtain the rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF. And then carrying out hydrothermal reaction and roasting treatment. The thermal stability of Sm-MOF is improved, ceric ammonium nitrate is adopted as a Ce source, a two-step heat treatment process is combined, the binding force and distribution uniformity of CeO2 on the surface of Sm-MOF are effectively improved, the catalytic activity and cycle stability of CeO2 / Sm-MOF are improved, and the Sm-MOF / CeO2 composite material has excellent degradation efficiency on MB, RhB, ATZ, CIP and the like and has excellent cycle stability in the cycle process.

The application discloses a novel nanocomposite photocatalyst, a preparation method thereof and application of the nanocomposite photocatalyst in photocatalytic reduction of carbon dioxide. The photocatalyst is prepared by using cerium nitrate and trimanganese tetraoxide as raw materials, using a mixed solution of ethanol and water as a solvent and using a muffle furnace for high-temperature calcination. The microstructure of the prepared CeO2 / Mn3O4 nanocomposite photocatalyst is a flower-like structure and contains high-concentration oxygen vacancies. The method solves the problem that pure trimanganese tetraoxide is not suitable for reduction of carbon dioxide by constructing a heterojunction. The CeO2 / Mn3O4 nanocomposite photocatalyst prepared by the method has good photocatalytic reduction activity of carbon dioxide under visible light.

The application discloses a coated modified lithium manganese iron phosphate lithium ion battery positive electrode material, and preparation steps thereof include the following steps: (1) preparing lithium manganese iron phosphate powder; (2) mixing pyridine and hexafluorophosphoric acid, adding lithium hydroxide and ethanol, and heating in a water bath to obtain a mixture; (3) adding an aqueous solution of indium trichloride, lithium manganese iron phosphate powder and L-malic acid into an ethanol solution of cerium nitrate and n-butyl titanate at the same time, ultrasonic dispersion is carried out, then the mixed solution is laid in a container, water and ethanol are removed by drying and evaporation, calcination is carried out at 120+5 DEG C, then the mixture and selenium acid powder are added and uniformly mixed, calcination is carried out again at 650+5 DEG C, after the completion of the calcination, air cooling is carried out to normal temperature, and the coated modified lithium manganese iron phosphate lithium ion battery positive electrode material is obtained. The positive electrode material prepared by coating and modifying lithium manganese iron phosphate according to the method can significantly improve the discharge specific capacity and capacity retention rate of the battery.

The invention relates to environment-friendly multifunctional long-acting antirust paste and a preparation method thereof, and belongs to the technical field of antirust paste. The antirust paste disclosed by the invention comprises the following raw materials in parts by weight: 22-26 parts of oleoyl sarcosine, 12-16 parts of a polymer, 15-25 parts of a corrosion inhibitor, 5-8 parts of ultramicro glass beads, 3-5 parts of a dispersed lubricant, 0.3-0.5 part of polyamide wax, 50-80 parts of paraffin oil and 10-20 parts of cerous nitrate microcapsules. The ultramicro glass beads serve as the abrasive, the rust removal efficiency is improved, meanwhile, it can be guaranteed that components are not damaged, in addition, when the rust-proof paste is used for repeated wiping, cerous nitrate microcapsules are exploded under the action of pressure to release cerous nitrate, a cerous oxide oxidation film is rapidly generated under the alkaline condition, and the rust removal effect is improved. And a protective film is formed on the surface of the component, so that the rust-proof long-term effect is effectively prolonged.

The invention provides a fiber-reinforced silicon zirconium oxide composite aerogel thermal insulation material and a preparation method thereof, and belongs to the technical field of thermal insulation materials. The invention relates to a fiber-reinforced silicon zirconium oxide composite aerogel thermal insulation material and a preparation method thereof. The preparation method comprises the following steps: providing silicon oxide fibers, and carrying out pretreatment to obtain a silicon oxide fiber preform; the preparation method comprises the following steps: preparing cerium-doped titanium dioxide nanoparticles from tetrabutyl titanate, cerium nitrate, absolute ethyl alcohol and water by adopting a sol-gel method; the preparation method comprises the following steps: adding a silicon source and zirconium oxychloride into an ethanol solution, stirring, adjusting the pH value to 3.0-4.0, adding cerium-doped titanium dioxide nanoparticles, and continuously stirring to form sol; and S3, soaking a silicon oxide fiber preform into the sol prepared in the step S3, pressurizing to fill the silicon oxide fiber preform with the sol, and after gelation, performing aging treatment, freeze drying and heat treatment to finally obtain the product. On the basis of improving the thermal insulation performance of the product, the mechanical property of the product is improved, and the phenomena of shrinkage, collapse and the like generated in the use process of the product are reduced.

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.