89 results about "Zirconium nitrate" patented technology

The invention discloses a neodymium-zirconium co-substituted M-type strontium ferrite wave-absorbing material and a preparation method thereof, the chemical formula of the neodymium-zirconium co-substituted M-type strontium ferrite wave-absorbing material is Sr1-xNdxZr0. 2Fe11.8 O19, and x is more than or equal to 0.1 and less than or equal to 0.4. The method comprises the following steps: (1) mixing strontium nitrate, ferric nitrate nonahydrate, neodymium nitrate hexahydrate, zirconium nitrate pentahydrate, citric acid monohydrate and deionized water, stirring and dissolving to obtain sol; (2) adjusting the pH value of the sol to 6.5-7.5, and then heating to carry out sol-gel reaction to obtain wet gel; (3) drying and grinding the wet gel to obtain precursor powder; and (4) performing heat treatment on the precursor powder in a box-type furnace, cooling and grinding to obtain the neodymium-zirconium co-substituted M-type strontium ferrite wave-absorbing material. According to the material, effective wave-absorbing frequency band broadening is achieved, the matching thickness corresponding to the effective wave-absorbing bandwidth is as thin as 0.55-0.7 mm, and meanwhile, the performance requirements of thinness, width and strength in the field of electromagnetic compatibility are met.

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 discloses a preparation method of zirconium molybdate particles, and belongs to the technical field of inorganic functional materials. In the preparation process, zirconium nitrate pentahydrate and ammonium molybdate tetrahydrate are used as raw materials, and deionized water is used as a solvent. The preparation method comprises the following steps: respectively dissolving the two raw materials in water, mixing, washing a reaction white gel product with water, washing with alcohol, centrifuging, drying, grinding and screening to obtain a precursor, roasting and recrystallizing to obtain zirconium molybdate particles, and controlling the particle size of the particles by the screening mesh number. The method has the advantages of few types of raw materials, simple preparation process and controllable particle size, and is beneficial to large-scale production and material performance optimization of zirconium molybdate.

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 discloses a zirconium-doped nickel sulfide self-supporting electrode material, a preparation method thereof, and an application thereof. The method comprises the following steps: step 1, adding 0.5-3 mmol of zirconium nitrate pentahydrate and 1.5-9 mmol of thioacetamide to a beaker containing 20 mL of anhydrous ethanol, and stirring evenly to obtain a mixed solution A; step 2, firstly transferring the mixed solution A dropwise to a polytetrafluoroethylene liner, then placing 1.5 cm×4 cm×0.2 cm of pure nickel foam into the polytetrafluoroethylene liner containing the mixed solution A, then sealing the polytetrafluoroethylene liner and placing it in an autoclave, finally placing the autoclave in an oven, heating the temperature from room temperature to 120-180° C. at a heating rate of 5° C. / min, and keeping the temperature until the reaction is fully completed; step 3, after the heat preservation is completed, allowing the autoclave to cool naturally to room temperature, taking out the product, cleaning it, and standing it at room temperature. After the product is completely dried, Zr-Ni 0.96 S / NF has excellent catalytic performance for water electrolysis.

The invention discloses composite powder and a preparation method thereof, and belongs to the field of preparation of powder for laser cladding, and the preparation method comprises the following steps: dissolving citric acid and polyvinylpyrrolidone in an ethylene glycol solution, then sequentially adding zirconium nitrate and WC particles, and fully stirring; transferring the mixed solution to a three-neck flask, setting the stirring speed and the heating rate of a heating magnetic stirrer, adding n-butylamine after the reaction temperature is reached, and carrying out constant-temperature reaction for a certain time to obtain a reactant; moving the reactant out of the heating device for cooling, and centrifugally washing and drying the cooled reactant to obtain a precursor product; and carrying out radio frequency plasma spheroidization on the precursor product to obtain the ZrO2-WC composite powder. The preparation method of the composite powder is simple and high in synthesis speed; zrO2-WC composite powder with different densities can be obtained by adjusting process parameters, and the requirements of different parent phase coating reinforced phases are met; according to the method, the problems of decarburization, burning loss and sinking segregation of WC in the laser cladding process are effectively avoided.

The present invention relates to glass microbeads, and in particular to a high-refractive-index, large-particle-size glass microbead for road marking and a spheroidization and molding preparation method thereof. The glass microbeads comprise, by weight, 30 to 40 parts of titanium dioxide, 30 to 40 parts of silicon dioxide, 10 to 15 parts of barium nitrate, 10 to 15 parts of zirconium nitrate, 5 to 7 parts of zinc oxide, 3 to 5 parts of boric acid, 3 to 5 parts of calcium fluoride, 5 to 110 parts of Nb2O5, and 5 to 15 parts of La2O3-ZrO2 compound. In the present invention, calcination at 900°C for 12 hours helps to improve the thermal stability and mechanical strength of the glass microbeads, enabling them to be used for a long time in harsh outdoor environments without being easily damaged. At a high temperature of 1300°C and a spray velocity of 75 m / s, the precise intersection of two nozzles in the combustion chamber ensures precise control of the melting and molding processes of the glass microbeads, thereby obtaining high-quality, high-refractive-index glass microbeads. The addition of Nb2O5 and La2O3‑ZrO2 complexes not only improves the refractive index of the glass microspheres but also maintains a high yield.

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 invention is suitable for the technical field of PZT piezoelectric ceramics, and provides a PZT piezoelectric film and a preparation method thereof.The preparation method comprises the following steps that PZT sol is prepared, specifically, the PZT sol is prepared from ethylene glycol monomethyl ether, lead acetate trihydrate, zirconium nitrate and tetrabutyl titanate; sol spin coating and heat treatment: carrying out spin coating and heat treatment on the prepared PZT sol; and annealing treatment: carrying out low-temperature and high-temperature annealing treatment on the basis of multiple times of spin coating and multiple times of annealing. The improved annealing process of low-temperature and high-temperature annealing is carried out on the basis of the multi-layer spin coating and multi-time annealing process, the PZT thin film subjected to low-temperature and high-temperature annealing is compact in structure and free of obvious boundary layers, gaps and cracks, and the remanent polarization of the thin film can reach 17.2 mu c / cm < 2 > at most and reaches the research level of peers at home and abroad.

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 invention relates to a CuO-ZnO-ZrO2-coated CeO2 core-shell catalyst, a preparation method thereof and an application of the CuO-ZnO-ZrO2-coated CeO2 core-shell catalyst in methanol preparation, the preparation method comprises the following steps: dissolving copper nitrate and zinc nitrate in deionized water to form a mixed solution, then adding a precipitator, and carrying out a hydrothermal reaction to obtain copper-zinc nanoscale dispersed particles; then dispersing the particles in deionized water, adding a zirconium nitrate aqueous solution for hydrothermal reaction, and precipitating zirconium on the outer layers of the particles; and adding a cerium nitrate aqueous solution and a precipitant into the system, carrying out a hydrothermal reaction, and after the reaction is finished, carrying out suction filtration, washing, drying, grinding and calcining to obtain the CuO-ZnO-ZrO2 at CeO2 core-shell catalyst. The application process is as follows: CO2 and H2 are used as raw materials, cyclohexanol is used as a solvent, and under the action of the core-shell catalyst, hydrogenation reaction is performed at 190-210 DEG C to prepare methanol. When the core-shell catalyst is applied to preparation of methanol through hydrogen transfer hydrogenation, excellent catalytic activity and stability and higher methanol selectivity can be shown.

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 discloses a modified metal organic framework material and a preparation method thereof, and belongs to the technical field of metal organic framework materials.The preparation method comprises the steps that zirconium nitrate pentahydrate is dissolved in water to prepare a zirconium nitrate solution, ceric ammonium nitrate is dissolved in water to prepare a ceric ammonium nitrate solution, and the ceric ammonium nitrate solution is dissolved in water to prepare the modified metal organic framework material; uniformly mixing the zirconium nitrate solution and the ammonium ceric nitrate solution in proportion to obtain a metal solution; the preparation method comprises the following steps: adding 1, 4-terephthalic acid serving as an organic ligand into DMF (Dimethyl Formamide), and uniformly mixing to obtain a ligand solution; the preparation method comprises the following steps: adding benzoic acid into a metal solution, stirring for 0.7-1h at 200-250r / min in a microwave-assisted manner, adding a ligand solution, carrying out a synthetic reaction for 10-13min at 95-98 DEG C, and washing and drying to obtain the modified metal organic framework material. The modified metal organic framework material prepared by the invention improves the degradation capacity of tetracycline in wastewater, and effectively shortens the synthesis time. When the dosage is 0.5 g / L, the appropriate concentration of tetracycline (TC) in the degraded wastewater is 19-22 ppm, and the TC degradation rate is higher than 92%.

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 present invention relates to the field of electrocatalyst technology, specifically a vacancy zirconium oxide-loaded nano-ruthenium catalyst, a preparation method, and an application thereof. Zirconium nitrate is used as a raw material, and after being fully mixed with a ruthenium chloride solution and hydrothermally processed, a powder precursor is obtained, which is then subjected to pyrolysis treatment to form a ruthenium oxide-loaded ruthenium powder rich in oxygen vacancies, which is a hydrogen evolution reaction electrocatalyst. The present invention first dissolves zirconium nitrate and ruthenium chloride in ethanol, combines them at the atomic level through a hydrothermal reaction, and then forms a crystalline and amorphous zirconium oxide interface, as well as an interface between zirconium oxide and ruthenium after carbonization under a low-temperature protective gas. The raw materials are mainly zirconium nitrate and ruthenium chloride, which are low in cost, can be prepared in large quantities, are easy to commercialize, can be used as an excellent HER catalyst, have high catalytic activity and good stability, and can be widely used in water electrolysis devices.

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 invention provides a preparation method of a perfluorinated and polyfluoroalkyl organic pollutant sensitive SERS (Surface Enhanced Raman Scattering) substrate. The method comprises the following steps: respectively carrying out ultrasonic treatment on tetrafluoroterephthalic acid and zirconium nitrate pentahydrate in a water / acetic acid mixed solution, and heating and refluxing in a distillation flask to obtain UiO-66-F4; then, chloroauric acid and sodium citrate are subjected to a reduction reaction to obtain a gold nanoparticle solution, and polyvinylpyrrolidone (PVP) is used for modifying the gold nanoparticle solution; the preparation method comprises the following steps: preparing a UiO-66-F4 aqueous solution, dropwise adding a PVP-modified gold nanoparticle solution into the UiO-66-F4 aqueous solution, fully stirring, dropwise coating the UiO-66-F4 aqueous solution on a silicon wafer, and naturally airing to finally obtain the UiO-66-F4-coated Au SERS substrate. The gold nanoparticles of the substrate are uniformly distributed, the substrate has a relatively strong SERS (Surface Enhanced Raman Scattering) effect, meanwhile, the MOF (Metal Organic Framework) crystallization effect of the substrate is relatively good, the sensitivity is high, the substrate has relatively strong enrichment capacity on perfluoro and polyfluoroalkyl organic pollutants, and the substrate can be used for rapid low-cost detection of perfluoro and polyfluoroalkyl organic pollutants in water.

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 invention discloses a preparation method of a ZrO2 core toughened ZrC blocky ceramic material, zirconium nitrate, starch, urea and yttrium nitrate are used as raw materials for hydrothermal reaction to obtain a hydrothermal precursor of the ceramic material, and the hydrothermal precursor is subjected to freeze drying and SPS sintering to obtain the blocky ZrO2 toughened ZrC ceramic material with ZrO2 as a core and ZrC as a surface layer. According to the method, the size of the core ZrO2 can be changed by changing the ratio of the zirconium source to the carbon source in the raw materials, and the toughening effect is coordinated. The precursor powder is subjected to SPS sintering, amorphous carbon on the surface layer and ZrO2 completely react to generate ZrC, the core part is still ZrO2, finally, a unique core-shell structure with the core part being ZrO2 and the surface layer being ZrC is obtained, and the obvious effect on improving the toughness of the ZrC ceramic material is achieved. In addition, the controllability of the ZrO2 toughening effect can be realized by changing the size of ZrO2 at the core part.

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.

The invention belongs to the technical field of molecular sieve catalysts, and discloses a catalyst for preparing isobutene through acetic acid conversion and a preparation method and application thereof.The preparation method comprises the steps that firstly, an HBeta molecular sieve is treated with concentrated nitric acid to prepare a dealuminated Beta molecular sieve; then zirconium oxynitrate and yttrium nitrate are loaded in the dealuminated Beta molecular sieve through an impregnation method, and a Y-Zr / Beta catalyst is obtained; the catalyst is a dual-Lewis acid catalyst, shows excellent catalytic activity and selectivity in a reaction for preparing isobutene by converting acetic acid, and can obtain higher isobutene yield; the catalyst carrier and the metal precursor salt are cheap and easy to obtain, and the preparation process is simple; therefore, a new effective way is provided for production of isobutene, and the situation that isobutene mainly depends on traditional energy at present is effectively relieved.

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.