108 results about "Zirconium nitrate" patented technology

The invention relates to a glass bead, in particular to a high-refractive-index large-particle-size glass bead for road marking and a spheroidizing forming preparation method of the high-refractive-index large-particle-size glass bead. The material comprises the following components in parts 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 a La2O3-ZrO2 compound. According to the invention, calcination is carried out at 900 DEG C for 12 hours, which is helpful for improving the thermal stability and mechanical strength of the glass beads, so that the glass beads can be used for a long time in a severe outdoor environment and are not easy to damage. And at the high temperature of 1300 DEG C and the spraying speed of 75 m / s, through precise intersection of the two nozzles in the combustion chamber, precise control over the melting and forming process of the glass beads is ensured, and therefore the high-quality high-refractive-index glass beads are obtained. The Nb2O5 and La2O3-ZrO2 compound is added, so that the refractive index of the glass beads is improved, and a relatively high yield is maintained.

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 discloses an iron-based bimetallic catalyst as well as a preparation method and a use method thereof. The iron-based bimetallic catalyst comprises an active metal; the composite carrier comprises zirconium oxide, a zirconium-based organic framework and an iron-based organic framework, the zirconium-based organic framework is coated with the iron-based organic framework, and iron and the active metal are loaded on the zirconium oxide. The preparation method comprises the following steps: mixing zirconium nitrate pentahydrate and a first organic ligand for reaction to obtain a zirconium-based organic framework material; mixing the zirconium-based organic framework material, a second organic ligand and a metal salt for reaction to prepare a composite organic framework material; calcining the composite organic framework material, and soaking the calcined composite organic framework material in a metal salt solution; and carrying out drying treatment to obtain the iron-based bimetallic catalyst. The iron-based bimetallic catalyst is used for the catalytic reaction of carbon dioxide hydrogenation to generate low-carbon olefins.

The invention provides a preparation method of a catalyst for synthesizing indole, which comprises the following steps: sequentially impregnating silicon dioxide in a manganese salt solution, a first alkali solution, a silver nitrate solution containing an auxiliary agent M and a second alkali solution by adopting an impregnation method, standing for 0-72 hours at the temperature of 0-50 DEG C during each impregnation, and drying for 0-72 hours at the drying temperature of 20-290 DEG C after each standing, the auxiliary agent M is any one or more of aluminum nitrate, zirconium nitrate, lanthanum nitrate and cerium nitrate. Manganese dioxide is used as an anchor point, so that silver oxide is effectively dispersed and anchored on the surface of a silicon dioxide carrier modified with manganese dioxide; and finally, a nitrate auxiliary agent with the atomic radius larger than that of silver atoms is added and used for inhibiting the rate of increasing the particle size of the silver particles due to agglomeration of the silver particles caused by high-temperature sintering. The preparation process does not involve treatment at 300 DEG C or above and roasting treatment, and the preparation method is simple in step.

The invention discloses an environment-friendly ceramic and a preparation method thereof, and belongs to the field of ceramics, the method comprises the following steps: grinding and mixing kaolin, boric oxide, carbon powder, zirconium, barium carbonate, calcium carbonate, boron, silicon and titanium to obtain a mixture; mixing zinc nitrate, zirconium nitrate and a dispersing agent to obtain a mixed solution; mixing the mixture with the mixed liquid to obtain mixed slurry; preparing the mixed slurry into a blank body; putting the blank body into a sintering furnace, heating to 560-720 DEG C, and treating in a first treatment environment for 1.5-4 hours; the temperature of the sintering furnace is increased to 880-1130 DEG C, and treatment is conducted for 2-5 h in a second treatment environment; the temperature of the sintering furnace is increased to 1280-1420 DEG C, and treatment is conducted for 3-6 h in a third treatment environment; the temperature of the sintering furnace is increased to 1530-1620 DEG C, and treatment is conducted for 1-3 h in a fourth treatment environment; the first treatment environment, the second treatment environment, the third treatment environment and the fourth treatment environment comprise vacuum or inert atmosphere. The sintered ceramic is high in strength and good in wear resistance and corrosion resistance.

The invention belongs to the field of coal chemical industry purification, and particularly relates to an ultrahigh-precision conversion absorption type dechlorination purifying agent and a preparation method thereof. Wherein the dechlorination purifying agent is prepared from the following components in percentage by weight: 5%-30% of Fe2O3, 1%-10% of CuO, 10%-30% of ZrO2, 20%-40% of Al2O3, 10%-20% of ZnO and the balance of auxiliaries. The preparation method comprises the following steps: preparing ferric nitrate, copper nitrate, zirconium nitrate, aluminum nitrate and zinc nitrate into a solution, carrying out co-precipitation by using alkali liquor as a precipitator, washing, drying and calcining the obtained material to obtain a precursor, dipping the precursor powder with ammonium dihydrogen phosphate or phosphoric acid, drying and calcining, and carrying out compression molding. The dechlorination purifying agent can reduce the total amount of organic chlorine and inorganic chlorine in raw gas such as raw coke oven gas, coke oven gas, natural gas and gaseous hydrocarbon to 0.01 ppm or below, has the capacity of converting and absorbing organic chlorine, and meanwhile has extremely high dechlorination precision.

The invention discloses a preparation method of a catalyst for a dehydration condensation reduction reaction, an obtained product and application, and the preparation method comprises the following steps: laying activated carbon in a fixed bed, then continuously introducing a mixed solution of copper nitrate, zinc nitrate and zirconium nitrate into the fixed bed, and enabling the mixed solution to be in full contact with an activated carbon layer; roasting the activated carbon which is in full contact with the mixed solution to obtain activated carbon loaded with copper oxide-zinc oxide-zirconium oxide; dispersing the active carbon loaded with copper oxide-zinc oxide-zirconium oxide into an organic solvent, then adding a vulcanizing agent to carry out vulcanization reaction, and filtering, washing and drying after the reaction to obtain the catalyst for the dehydration condensation reduction reaction. The preparation method of the catalyst is simple and convenient to operate, low in cost and small in environmental pollution, can be applied to dehydration condensation reduction reaction of various ketones or aldehydes and amines, improves the selectivity of the reaction, reduces side reaction products, has a good catalytic effect, and has an industrial development prospect.

The invention discloses a control method for a dendritic structure of a multi-principal-element rare earth doped zirconium oxide thermal barrier coating, and belongs to the field of thermal barrier coatings. The control method comprises the steps that a high-temperature alloy sample with a bonding layer is put into first electrolyte, the high-temperature alloy sample serves as a negative electrode, a graphite plate serves as a positive electrode, a micro-arc oxidation power source is connected, and first electrolysis is conducted; an anti-oxidation ceramic barrier layer is deposited on the surface of the high-temperature alloy sample, then the high-temperature alloy sample with the anti-oxidation ceramic barrier layer is placed in a second electrolyte, the high-temperature alloy sample serves as a negative electrode, a graphite plate serves as a positive electrode, a micro-arc oxidation power source is connected, and second electrolysis is conducted; wherein the first electrolyte comprises aluminum nitrate and rare earth element metal salt, and the second electrolyte comprises zirconium nitrate and rare earth element metal salt. The process parameters are convenient to adjust, the compactness of the dendritic structure coating is effectively improved through doping of the rare earth elements and introduction of the anti-oxidation barrier layer, and the heat insulation temperature and the heat shock performance of the dendritic structure coating are improved.

The invention relates to a preparation method of an electrolyte layer, the electrolyte layer, a fuel cell and a cell assembly. The preparation method of the electrolyte layer comprises the following steps: mixing sodium chloride, potassium chloride and lithium chloride to obtain a molten salt solvent; mixing zirconium nitrate and yttrium oxide to obtain a reaction reagent; the fused salt solvent and the reaction reagent are mixed, and spraying powder is obtained; the spraying powder and a first solution are mixed, an electrolyte suspension is obtained, the first solution at least comprises an organic solvent and an inorganic solvent, the spraying powder suspends in the organic solvent, and the spraying powder and the inorganic solvent are mutually dispersed; and according to a first preset temperature, spraying the electrolyte suspension onto a support body to form a target electrolyte layer on the support body.

A zirconium polymer composition comprising a zirconium polymer selected from the group consisting of polymeric zirconium oxychloride, polymeric zirconium acetate, and polymeric zirconium nitrate and having metal particles thereon is beneficial to aid in the removal of biological contaminants, such as bacteria, virus, yeast, algae, and amoeba, from fluids, including air and water. In this composition, the metal is selected from the group consisting of aluminum (Al), antimony (Sb), arsenic (As), barium (Ba), silicon (Si), boron (B), copper (Cu), gold (Au), lead (Pb), mercury (Hg), nickel (Ni), silver (Ag), thorium (Th), tin (Sn), zinc (Zn), and mixtures thereof, and the metal particles are about 0.001% by weight to about 30% by weight of the composition. These zirconium polymer compositions are used in methods for removing biological contaminants from fluids.

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 invention relates to a methanol reforming hydrogen production copper-based / solid solution catalyst and a preparation method and application thereof, the molecular formula of the catalyst is 7% CuO / ZnxZr1-xOy, x = 0.1-0.7, zinc nitrate hexahydrate and zirconium nitrate pentahydrate are mixed and dissolved according to the molar ratio of Zn / Zr, ammonia water precipitation is performed, washing, filtering, drying and roasting are performed to obtain a ZnxZr1-xOy solid solution carrier, CuO is loaded through an impregnation method to obtain the catalyst, and the catalyst is prepared from the CuO, the ZnxZr1-xOy solid solution carrier and the ZnxZr1-xOy solid solution carrier. The solubility of solute Zn < 2 + > ions in the ZnxZr1-xOy solid solution in ZrO2 crystal lattices is quantified by adopting XRD and XPS extrapolation methods, and the catalyst with the optimal proportion is obtained. The catalyst provided by the invention has the advantages of low production cost, no secondary pollution to the environment, simple synthesis process, easy control of the reaction process, low CO selectivity and the like, and has good reaction performance and thermal stability in the process of hydrogen production by methanol steam reforming.

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 present invention relates to the technical field of methacrylate synthesis, and specifically discloses a molecular sieve catalyst for methacrylate synthesis and a preparation method thereof. The above-mentioned catalyst preparation method includes: adding type A microporous molecular sieve to anhydrous ethanol and ultrasonically treating at room temperature for 1-2h, adding ethylenediamine, stirring at 50-70°C for 1-2h, and removing anhydrous ethanol by rotary evaporation to obtain a pre-treated molecular sieve; adding the pre-treated molecular sieve, yttrium nitrate, and tetraethyl orthosilicate to an ethanol aqueous solution and stirring evenly, adjusting the system pH value to 8-9, 80-90°C insulation for 5-10h, cooling to room temperature, washing, and vacuum drying to obtain a composite molecular sieve; calcining the composite molecular sieve at 300-500°C for 2-4h, cooling to room temperature, adding to water, adding zirconium nitrate, cesium nitrate, and graphene oxide for ultrasonic treatment for 5-10h, standing for 5-10h, 160-190°C hydrothermal reaction for 2-6h, cooling to room temperature, filtering, washing, and vacuum drying.

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%.