41 results about "Cerous chloride" patented technology

The invention provides a rare earth heat insulation coating and a preparation method thereof. The coating comprises the following components in parts by weight: 50-60 parts of acrylic resin, 10-15 parts of polyurethane modified epoxy resin, 5-8 parts of nano rare earth powder, 3-5 parts of filler, 0.5-1 part of a coalescing agent, 1-2 parts of a defoaming agent, 1-3 parts of a dispersing agent, 0.5-1 part of an ultraviolet light absorber and 1-2 parts of a silane coupling agent. Wherein the nano rare earth powder comprises lanthanum oxide powder, cerium chloride powder and yttrium hexaboride powder, and the filler comprises nano hollow microspheres, nano calcium carbonate and nano aluminum silicate. The rare earth heat insulation coating has excellent heat insulation effect and mechanical property, and can be applied to various scenes.

The invention discloses polyacrylate anti-deposition and cerium chloride synergistic composite corrosion inhibitor cooling liquid, relates to the field of cooling liquid, and is particularly suitable for a multi-metal cooling system. According to the method, polyacrylate, cerium chloride, benzotriazole, benzimidazole, ethylene glycol, deionized water and triethanolamine serve as core raw materials, during preparation, equipment and the raw materials are pretreated, then a base solution is prepared, the pH value is adjusted to be alkalescent, then polyacrylate and cerium chloride are dissolved and coordinated, an auxiliary corrosion inhibitor is added, and synergistic protection is formed. And defoaming, filtering and filling. The cooling liquid adapts to multi-metal material protection through the synergistic effect of deposition resistance of polyacrylate and corrosion inhibition and synergism of cerium chloride, the cooling liquid is diluted according to working conditions during application, waste cooling liquid is discharged after being subjected to combined treatment of biological contact oxidation and Fenton oxidation, a finished product needs to be stored in a proper environment in a sealed mode, and the protection performance, the environmental protection property and the storage stability are effectively considered.

The invention discloses a catalyst for synthesizing glycollic acid and a preparation method. The catalyst comprises the following components in percentage by weight: 5-10% of copper oxide, 15-40% of manganese oxide, zirconium oxide or cerium oxide and 50-80% of modified aluminum oxide. The preparation method comprises the following steps: adding a certain amount of copper-containing compound solution into aluminum oxide powder modified by manganese chloride, zirconium chloride or cerium chloride, adding gel containing water, binder methyl cellulose and peptizing agent, uniformly kneading on a kneading machine, and extruding and molding the kneaded material on a banded extruder to obtain the copper-containing aluminum oxide composite material. And drying and roasting to obtain the catalyst for synthesizing glycollic acid. The catalyst for synthesizing glycollic acid, prepared by the invention, takes modified aluminum oxide as a main component, and has better activity and performance; the preparation process provided by the invention is relatively environment-friendly, and has a relatively good application prospect.

The invention discloses a rare earth element doping modification process of an optical module electroplated layer, which belongs to the technical field of optical module manufacturing, and comprises the following steps: sequentially carrying out oil removal, acid pickling and activation treatment on an optical module matrix to form a clean active surface; the preparation method comprises the following steps: taking nickel aminosulfonate or potassium gold cyanide as main salt, adding 0.5-5g / L of rare earth salt which is at least one of cerium chloride, lanthanum nitrate or yttrium sulfate, and adding 5-15g / L of sodium citrate complexing agent and lauryl sodium sulfate surfactant; under the conditions that the pH is 3.5-4.5 and the temperature is 45-55 DEG C, pulse current with the density being 2-5 A / dm < 2 > is adopted for electroplating, the pulse frequency is 100-500 Hz, and the duty ratio is 30-50%; when electroplating deposition is carried out, hydrogen bubbles on the outer side of the optical module are removed through a hydrogen removal device, the hydrogen bubbles are prevented from being attached to the surface of a cathode, and the uniformity of codeposition of rare earth and metal is ensured; and after electroplating is completed, deionized water cleaning and vacuum drying are carried out on the optical module. The high temperature resistance of the surface of the optical module obtained through the technology is improved.

The present invention relates to the technical field of hemostatic materials, and in particular to a kaolin hemostatic material with anti-inflammatory function, and a preparation method and application thereof. The kaolin hemostatic material with anti-inflammatory function of the present invention comprises kaolin loaded with CeO2 nanoparticles. The preparation method comprises mixing kaolin with cerium chloride, sodium carbonate and sodium chloride in a certain mass ratio, ball milling the mixture and obtaining a precursor, and calcining the precursor to obtain the kaolin hemostatic material with anti-inflammatory function. The present invention adopts kaolinite, which is inexpensive and abundant in reserves, as a raw material, selects conventional CeO2 raw material, and prepares a kaolin-based nanomaterial loaded with CeO2 by a mechanochemical synthesis method, thereby preparing a CeO2 / K nanomaterial with synergistic anti-inflammatory and hemostatic activity.

The invention provides a fluidized catalytic cracking catalyst with high rare earth content, a preparation method and application of the fluidized catalytic cracking catalyst in a high-iron vanadium-nickel feed catalytic cracking process, the preparation method comprises the following steps: step 1, mixing and stirring clay, pseudo-boehmite, cerium chloride, alumina sol, silica sol and water to obtain a first mixed solution; step 2, adding a P modified USY molecular sieve, cerium chloride and a silicon-containing macroporous bauxite slurry into the first mixed solution in the step 1, pulping, homogenizing, forming, roasting, washing and drying to obtain the fluidized catalytic cracking catalyst with high rare earth content. At present, the conventional rare earth content in the industry is less than 3.5% and is not more than 5% at most, while the catalyst disclosed by the invention adopts the design of high rare earth content and low molecular sieve content, iron, vanadium and nickel are passivated by the high rare earth content, and the structural stability of the catalyst is guaranteed.

The application discloses a preparation method of a carbon-loaded CeNCl catalyst and application thereof, and belongs to the field of catalysts. The preparation method comprises the following steps: mixing cerium chloride and chitosan, and performing ball milling treatment to obtain pretreated materials; and performing calcination treatment on the pretreated materials in an N2 atmosphere, and naturally cooling after the calcination treatment is completed to obtain the carbon-loaded CeNCl catalyst. The catalyst preparation process is simple, time-consuming is short, and mass production and industrial application can be realized. The catalyst after a catalytic reaction is easy to separate and recycle. The catalyst preparation raw materials are widely sourced and cheap. The catalyst has excellent catalytic performance and can obtain a yield close to 100%.

The present application relates to a kind of micro CO efficient removal adsorbent and its preparation and application, the preparation method includes the following steps: (1) active carbon powder, active component A, inorganic clay and dispersing agent are placed in ball mill and are uniformly ground, and mixture material is obtained;(2) active component B and the water solution of reducing agent are atomized and sprayed into the mixture material, then glue is added, and wet material is obtained;(3) wet material is extruded into shape by template, after heat reduction, after drying, calcination, CO removal adsorbent is obtained, i.e. target product;Active component A is monovalent copper salt, and active component B is the mixture of lanthanum chloride and at least one of cerium chloride or yttrium chloride.The strength and adsorption capacity of the CO removal adsorbent of the present application are increased by more than 30% and 25% respectively, the strength is ≥40N / cm, the wear is ≤1.5wt%, the CO adsorption capacity is ≥35ml / g (40℃), the removal precision can reach below 0.01ppm, suitable for the efficient purification of trace CO in hydrogen, nitrogen and other raw gas.

The application relates to a composite catalytic system for accelerating hydrogen production by magnesium hydride hydrolysis and a preparation method and application thereof, relates to the technical field of hydrogen production by magnesium hydride hydrolysis, and solves the problem that the existing hydrogen production by magnesium hydride hydrolysis reaction has large mass transfer resistance in the later stage and it is difficult to realize rapid and complete conversion of MgH2 under mild conditions. The composite catalytic system is composed of independently mechanically ball-milled pre-activated magnesium hydride powder and cerium chloride powder. In an inert atmosphere, the magnesium hydride powder is independently mechanically ball-milled for pretreatment to obtain activated magnesium hydride powder; the activated magnesium hydride powder and the cerium chloride powder are uniformly mixed according to a set molar ratio to obtain a cerium-based composite catalytic system. The above cerium-based composite catalytic system is added into water to initiate a hydrolysis reaction for hydrogen production at 20-60 DEG C. The catalytic system can stably meet the rapid gas production demand of a portable hydrogen supply device, has catalytic efficiency and cost advantages, and is suitable for large-scale application in actual scenes.

The present invention relates to a hydrosilylation-curable organopolysiloxane composition which contains an organopolysiloxane and an organohydrogenpolysiloxane crosslinked via a hydrosilylation reaction, a nonreactive organopolysiloxane resin which exhibits a mass loss rate of 2.0 mass% or less when exposed to 200°C for 1 hour, and optionally a reaction product of an alkali metal silanolate and at least one or more cerium chlorides and / or carboxylates. The composition has a low elastic modulus and low stress, and has excellent strength, cold resistance, and transparency. Furthermore, the addition of a cerium compound allows these characteristics to be maintained even under high temperature conditions for a long period of time, and provides a cured product that is resistant to cracking, peeling, and the like, particularly when a strong temperature gradient occurs inside the composition.

The invention belongs to the technical field of titanium dioxide, and particularly relates to a preparation method of special titanium dioxide for PEEK special plastics, the special titanium dioxide for PEEK special plastics is prepared through composite coating of cerium chloride and polydimethylsiloxane, and a cerium chloride modified and coated cerium oxide film layer can capture free radicals and inhibit high-temperature oxidation of PEEK; the dispersion performance of the titanium dioxide and the compatibility of the titanium dioxide and PEEK can be improved through modified coating of the polydimethylsiloxane; after a PEEK crude product is prepared by mixing and hot pressing the prepared special titanium dioxide for the PEEK special plastic and the PEEK, dopamine amide is used for surface modification, and the dopamine amide can be connected with the surfaces of the PEEK and the titanium dioxide, so that the surface defects are reduced, and the impact resistance of the PEEK special plastic is improved; the prepared PEEK special plastic has excellent antibacterial performance and impact resistance. The special titanium dioxide for the PEEK special plastic disclosed by the invention has excellent oxidation resistance, dispersibility and compatibility with PEEK.

The invention belongs to the field of organic synthesis and photocatalysis, and relates to a method for preparing a disulfide compound and producing hydrogen by catalyzing dehydrogenation of a sulfydryl compound through cerium trichloride. A sulfhydryl compound 1 is used as a raw material, cerium salt is used as a photocatalyst, and a photocatalytic reaction is carried out under the irradiation of visible light to prepare a disulfide compound 2 and hydrogen. According to the method, a visible light catalysis system is adopted, cerium trichloride is used as a catalyst, and efficient dehydrogenation coupling reaction of the sulfhydryl compound is achieved under the conditions of normal temperature and normal pressure; in the reaction, an oxidizing agent (such as peroxide or metal high-valence salt) or a free radical initiator does not need to be additionally added, only hydrogen (H2) is used as a unique byproduct in the reaction and can be recycled, the problems of toxic byproducts and metal residues generated by using a strong oxidizing agent in a traditional method are avoided, and the method conforms to the development concept of green chemistry.

The invention discloses a preparation method of a zinc-cerium aerogel sensing material for detecting acetone gas, and relates to the field of aerogel sensing materials. The preparation method of the zinc-cerium aerogel sensing material for detecting acetone gas comprises the following steps: mixing anhydrous zinc chloride and anhydrous cerium chloride according to a molar ratio of 1: 2 in a solution of absolute ethyl alcohol and ultrapure water according to a ratio of 3: 1, adding citric acid according to a molar ratio of more than or equal to 1: 10 to the anhydrous zinc chloride, then adding ethylene oxide according to a molar ratio of more than or equal to 1: 2 to the anhydrous zinc chloride, and uniformly stirring to obtain the zinc-cerium aerogel sensing material for detecting acetone gas. The zinc-cerium aerogel sensing material capable of detecting the acetone is prepared by adding the zinc-cerium aerogel into a tubular furnace, drying the zinc-cerium aerogel in a 5L carbon dioxide supercritical drying device, and finally preparing the zinc-cerium aerogel sensing material capable of detecting the acetone through the tubular furnace in an air atmosphere under the conditions that the heating rate is 1-2 DEG C / min, the calcining temperature is 500 DEG C and the calcining time is 4 hours, and the prepared sensing material has the advantages of high response to the acetone, low detection limit and the like. The characteristics of high specific surface area and high porosity of the aerogel material are fully exerted.

The invention relates to the technical field of metal material corrosion resistance research, in particular to a preparation method of a rare earth conversion coating on the surface of an AZ91D magnesium alloy material. According to the preparation method, the AZ91D magnesium alloy is placed in a rare earth passivation solution to be soaked, and preparation of the rare earth conversion coating on the surface of the AZ91D magnesium alloy is completed; the rare earth passivation solution is rare earth salt, a hydrogen peroxide solution and water; the rare earth salt is one or two of cerium chloride and lanthanum chloride. Cerium chloride, lanthanum chloride or cerium chloride and lanthanum chloride are used for replacing highly toxic chromate; precise control over the thickness, density and component distribution of a film layer is achieved by improving key process parameters such as passivation temperature, time, concentration and a soaking mode, the uniformity and matrix binding force of the conversion film are remarkably improved, local corrosion weak points are avoided, the high-quality rare earth conversion film is formed, and the service life of the rare earth conversion film is prolonged. And the corrosion resistance of the AZ91D magnesium alloy is improved through the rare earth synergistic effect.

The invention relates to a cerium oxide precursor sol spinning solution and a preparation method of a cerium oxide fiber membrane. The method comprises the steps of synthesis of a cerium oxide precursor, preparation of sol, electrostatic spinning and heat treatment. Anhydrous cerium chloride and basic cerium carbonate are used as cerium sources, an oxidation-reduction reaction is innovatively adopted to promote dissolution coordination of cerium so as to synthesize a high-quality precursor, then the prepared precursor and an alcohol solvent are mixed according to a certain proportion, a trace amount of a spinning auxiliary agent is added, and the cerium oxide fiber membrane with excellent performance can be obtained through electrostatic spinning and heat treatment. The method has the advantages that the precursor synthesis process is controllable, high-quality fibers can be rapidly prepared, and industrial production and application are facilitated. The cerium oxide fiber membrane has potential application in the aspects of thermal radiation resistance, thermal insulation, photocatalysis and the like.

The invention discloses a method for preparing high-grade low-chloride large-particle crystal form cerous carbonate normal salt, which comprises the following steps: diluting rare earth in a cerium chloride solution with pure water until the rare earth concentration is 0.23-0.35 mol / L and the pH value is 2-5; preparing an ammonium bicarbonate solution by using pure water, and controlling the concentration of the ammonium bicarbonate solution to be 2.2-2.6 mol / L; adding seed crystal cerium carbonate and an ammonium bicarbonate solution into the cerium chloride solution, stirring, and carrying out carbon precipitation reaction at the reaction temperature of 50 + / -2 DEG C; and leaching the cerium carbonate slurry by using leaching water, and carrying out suction filtration to obtain the large-particle crystal form cerium carbonate. An ammonium bicarbonate precipitation method is used, additives are not needed, the large-particle-size cerium carbonate product is prepared by controlling main factors influencing precipitation, and the purpose that the particle size of the carbonate product is controllable is achieved.

This disclosure relates to a hydrosilylation-curable organopolysiloxane composition which contains an organopolysiloxane and an organohydrogenpolysiloxane crosslinked via a hydrosilylation reaction, a non-reactive organopolysiloxane resin which exhibits a mass loss rate of 2.0 mass % or less when exposed to 200° C. for 1 hour, and optionally a reaction product of an alkali metal silanolate and at least one or more cerium chlorides and / or carboxylates. The composition has a low elastic modulus and low stress, and has excellent strength, cold resistance, and transparency. Furthermore, the addition of a cerium compound allows these characteristics to be maintained even under high temperature conditions for a long period of time, and provides a cured product that is resistant to cracking, peeling, and the like, particularly when a strong temperature gradient occurs inside the composition.

The invention discloses a composite material as well as a synthesis method and application thereof. The composite material comprises cerium chloride nitrogen and carbon. The synthesis method of the composite material comprises the following steps: mixing chloromethyl resin with a first solvent, adding a nitrogen-containing organic compound for reaction, and drying to obtain modified chloromethyl resin; adding a cerium precursor and a second solvent into the modified chloromethyl resin under heating and stirring conditions, mixing, drying, and roasting in an inert gas atmosphere to obtain the composite material. The composite material disclosed by the invention can be applied to transesterification and shows good catalytic performance.

This invention relates to the field of wastewater treatment, specifically to a water treatment agent for synergistic removal of fluoride and heavy metals and its preparation method. By weight, it comprises the following raw materials: 100 parts water, 10-30 parts aluminum-based flocculant, 0.5-3 parts citric acid, 2-10 parts modified montmorillonite, 1-3 parts cerium chloride heptahydrate, 1-8 parts calcium chloride, 1-3 parts soluble zirconium salt, 2-4 parts thiolated chitosan, and 2-3 parts stabilizer. Through the synergistic effect of the aluminum-based flocculant, organic ligand, modified montmorillonite, polymetallic salt, and thiolated chitosan, it achieves efficient, deep, and simultaneous removal of fluoride ions and various heavy metal ions from wastewater, exhibiting high removal efficiency and good stability.

The application belongs to the technical field of medical organic synthesis, and particularly relates to a preparation method of an oxazole ester compound. The oxazole ester compound is prepared by using N-ethoxyoxalyl-alpha-alanine ethyl ester (oxalate) as a starting material, adding a catalytic amount of rare earth cerium trichloride as a catalyst under the action of triphenylphosphine dichloride and an organic base, and promoting a chloro-cycloaddition reaction by using a rare earth coordination effect. The obtained oxazole ester can be further subjected to saponification and decarboxylation to obtain a vitamin B6 intermediate 4-methyl-5-ethyloxazole. The reaction rate is significantly accelerated and the reaction yield is improved by using the coordination effect of the rare earth cerium trichloride, the amount of the cerium trichloride is as low as 0.003%, and the cerium trichloride is easy to recover. The process does not need to use imidazole compounds as a catalyst, and the problem of difficult recovery of imidazole is avoided. The process is green, environmentally friendly, safe, simple and convenient to operate, the yield and purity of the target product are high, and the process is suitable for industrial production.

This invention discloses a palladium-based bimetallic ene catalytic material modified with polyaniline molecules, its preparation method, and its application. The preparation method includes the following steps: preparing a DMF solution of potassium palladium chloride and cerium chloride; preparing a mixed solution of KOH, DMF, and EG; adding the potassium palladium chloride and cerium chloride solutions dropwise into the mixed solution, then adding polyaniline molecules, followed by DETA; placing the mixed solution into a stainless steel high-pressure reactor lined with Teflon for hydrothermal reaction; after the reaction, cooling to room temperature, centrifuging, washing, and drying to obtain the palladium-based bimetallic ene catalytic material. The raw materials used in this invention are inexpensive and readily available. The prepared material, when used as the negative electrode of a proton exchange membrane fuel cell, exhibits a high power density. This method is simple, cost-effective, easy to operate, and can be mass-produced.

This invention belongs to the field of coating technology, specifically relating to a durable anti-corrosion coating, its preparation method, and its application in bridge steel structures. In preparing the durable anti-corrosion coating, this invention first reacts magnesium nitrate hexahydrate with ZIF-67 to obtain LDH nanoparticles, and then loads them with a 2-mercaptobenzimidazole corrosion inhibitor to obtain corrosion-inhibiting LDH nanoparticles. Pyrrole and dopamine are then subjected to in-situ oxidative polymerization on the surface of the corrosion-inhibiting LDH nanoparticles to obtain a corrosion-inhibiting active filler. Next, tetramethyldihydrodisiloxane, octamethylcyclotetrasiloxane, and trifluoropropylmethylcyclotrisiloxane are used as monomers to synthesize polysiloxane intermediates, and cerium chloride and allylamine are introduced to obtain an anti-UV polysiloxane curing agent. Finally, epoxy resin, the anti-UV polysiloxane curing agent, and the corrosion-inhibiting active filler are mixed and vacuum degassed to obtain the durable anti-corrosion coating. The coating prepared by this invention exhibits excellent anti-corrosion performance, durability, and mechanical properties.

The present invention discloses a gun-black tin-nickel alloy electroplating and electrolytic protection process. The electroplating process comprises: 240-280 g / L potassium pyrophosphate, 50-60 g / L nickel chloride hexahydrate, 7-9 g / L stannous chloride dihydrate, 1-2 g / L lanthanum chloride or praseodymium chloride, 13-18 g / L potassium thiocyanate, 0.6-1.8 g / L methionine, 20-30 g / L ammonium citrate, 4-6 g / L disodium ethylenediaminetetraacetic acid, a pH range of 7.8-8.2, a plating bath temperature of 35-40°C, a cathode current density of 1-3 A / dm2, and a cathode travel of 3-5 m / min. The electrolytic protection process is as follows: 2-5 g / L cerium chloride, 2-5 g / L sodium molybdate, 15-30 g / L sodium hydroxyethylidene diphosphonate, 100-150 g / L anhydrous potassium carbonate, pH range 11-13, room temperature operation, cathode current density 0.5-1.2 A / dm², using the plated part as the cathode and the titanium plate as the anode, and electrolysis for 60-120 seconds. The prepared gunmetal black tin-nickel alloy plated part was subjected to a neutral salt spray test for 96 hours in accordance with GB / T 10125-2021 "Artificial Atmosphere Corrosion Test Salt Spray Test", and no corrosive products were generated on the surface of the coating. The gunmetal black tin-nickel alloy electroplating and electrolysis process of the present invention improves the corrosion resistance of the coating and solves the high pollution problem of the dichromate electrolytic protection method.

The invention relates to the technical field of corrosion resistance of metal materials, in particular to a rare earth passivation solution and a preparation method and application thereof. The rare earth passivation solution provided by the invention comprises the following components in parts by mass: 3-8 parts of a film-forming agent, 10-20 parts of an accelerant and 70-85 parts of water, wherein the film-forming agent is cerium chloride and praseodymium chloride; and a magnesium alloy is placed in the rare earth passivation solution to be soaked, and preparation of the rare earth passivation film on the surface of the magnesium alloy is completed. The mixed rare earth cerium chloride and praseodymium chloride synergistic modification technology is adopted, and the corrosion resistance of the AZ31 magnesium alloy is remarkably improved through the structural design of the composite passive film.

The present invention provides a coke strengthening and modifier, its preparation method, and a coke modification method, belonging to the field of blast furnace ironmaking technology. The coke strengthening and modifier provided by the present invention comprises the following raw material components: 15-30 parts boric anhydride; 10-14 parts solid water glass; 3-5 parts mineralizer; 5-8 parts film-forming agent; and 2-8 parts surface wetting agent. The mineralizer is a mixture of yttrium nitrate and cerium chloride in a 1:1 weight ratio. The coke strengthening and modifier provided by the present invention can form a coating on the coke surface, improving the toughness and strength of the coke, and slowing the dissolution reaction of the coke, thereby reducing the cost of existing blast furnace ironmaking. The coke strengthening and modifier has a wide range of raw material sources, a simple preparation process, and low cost. It is simple to use, requires a small amount, and has excellent modification effects. It can significantly reduce the reactivity of the coke and significantly increase the post-reaction strength of the coke. The method of the present invention can reduce the coke ratio, increase pig iron production, and reduce carbon emissions.

The invention relates to the technical field of metal material manufacturing, in particular to a preparation method of rare earth cerium and cerium dioxide coated graphene synergistically enhanced aluminum alloy, which comprises the following steps: step 1, dispersing graphene oxide in deionized water, and carrying out ultrasonic oscillation to obtain uniformly dispersed graphene oxide suspension liquid; the preparation method comprises the following steps: adding cerium chloride heptahydrate and a surfactant hexadecyl trimethyl ammonium bromide into a dispersion liquid of graphene oxide, uniformly stirring a mixed solution, and dropwise adding a sodium hydroxide solution to adjust the pH value of the solution; the cerium dioxide coated graphene is creatively combined with the added cerium element, cerium dioxide on the surface of the graphene and an aluminum melt are subjected to an in-situ reaction, and a transition layer is formed at an interface to enhance combination between the graphene and an aluminum matrix and inhibit generation of a brittle phase Al4C3; meanwhile, the cerium element in the aluminum melt and the cerium released by the interface reaction jointly achieve the effects of grain refinement and dispersion strengthening.

The invention belongs to the technical field of nano materials and biological catalysis, and particularly relates to a preparation method of cerium atom doped palladium particle nano enzyme. The method comprises the following steps: uniformly mixing palladium chloride and cerium chloride which are used as metal precursors, phloroglucinol which is used as a reducing agent and a mixed solution of oleylamine and octadecene which is used as a solvent and a dispersion medium, carrying out high-temperature reaction in a closed reaction kettle, and centrifuging, washing and drying a reaction product to obtain the Ce atom-doped Pd nano-particles with waxberry-shaped morphology. According to the invention, Ce is embedded into a Pd lattice in an atomic-scale dispersion form, and most of Ce is located at the junction of the Pd (111) and Pd (100) crystal faces to form a d-f orbital hybrid structure, so that the electron transfer ability of the material is significantly enhanced. The prepared nano-enzyme has excellent catalase-like activity and oxygenase-like activity at the same time under the weak acid condition, the activity of the two enzymes can be efficiently cascaded, and the catalytic activity is remarkably improved compared with that of the nano-enzyme without Pd doping.

The invention relates to a preparation method of anhydrous cerium chloride, which comprises the following steps: performing multi-stage heating dehydration treatment on a cerium chloride hydrate under a vacuum condition to obtain the anhydrous cerium chloride, wherein in two adjacent stages of heating dehydration treatment, the vacuum degree of the next stage of heating dehydration treatment is 50-2000Pa lower than that of the previous stage of heating dehydration treatment, and the temperature of the next stage of heating dehydration treatment is 10-115 DEG C higher than that of the previous stage of heating dehydration treatment. According to the method, free water, crystal water and hydroxyl water are gradually stripped in an environment without adding chemical reagents, the hydrolysis side reaction is inhibited in the whole process, the prepared anhydrous cerium chloride water is small in oxygen residue and low in impurity content, and the purity of the anhydrous cerium chloride is improved.

The invention discloses cerium lanthanum oxyfluoride polishing powder, a precision polishing cerium-based rare earth polishing solution and a preparation method thereof, and relates to the field of polishing materials. The preparation method of the polishing powder comprises the following steps: preparing lanthanum chloride cerium blending liquid, and regulating and controlling the concentration and proportion of lanthanum chloride and cerium chloride; after dilution, adding a composite precipitant, stirring and precipitating, wherein the composite precipitant comprises sodium fluoride, sodium phosphate, sodium carbonate and water; and then carrying out firing treatment to obtain the lanthanum cerium oxyfluoride. According to the preparation method, the concentration and proportion of lanthanum chloride and cerium chloride in a precursor are adjusted, meanwhile, a lanthanum cerium fluorocarbonate filter cake is added as a seed crystal, and a composite precipitator is added for precipitation and fluorination, so that the crystal structure of the polishing powder is microcosmically changed, an acute octahedron or a cube is converted into a truncated octahedron, and the initial grain size is reduced; due to the arrangement of a firing curve, coarse grains can be avoided, particles are uniformly distributed, and scratches and roughness of a polished sample can be reduced when a subsequent polishing solution is applied to polishing of an STN or ITO material.