76 results about "Lanthanoid Series Elements" patented technology

The invention discloses a preparation process of a rare earth precipitation resistant electrophoretic coating for an automobile body. The preparation process comprises the following steps: S1, preparing a stable solution; s2, preparing a rare earth chelating solution; adding lanthanum lactate into the stable solution for multiple times, and adding ammonium ceric sulfate for multiple times after the lanthanum lactate is completely dissolved; s3, preparing a resin base solution; s4, preparing mixed slurry; s5, adding a solvent and an auxiliary agent; a five-membered ring chelate with thermodynamic stability is formed by carboxyl, hydroxyl and rare earth elements in sodium citrate, rare earth ions can be tightly wrapped through strong coordination bonds, namely, empty orbits of the rare earth ions and lone pair electrons of a chelating agent form coordination bonds, so that the rare earth ions cannot be dissociated in a system, and the rare earth ions are prevented from being dissociated in the system. And a path of generating hydroxide precipitates by free rare earth ions is thoroughly blocked, so that rare earth elements are effectively ensured to be uniformly distributed in the electrophoretic paint, and the surface of a raw material treated by a subsequent electrophoresis process is more uniform.

The invention belongs to the technical field of aluminum alloy grain refiners, and particularly relates to a grain refiner and a preparation method and application thereof.The preparation method of the grain refiner comprises the following steps that S1, aluminum powder, vanadium powder, boron powder and lanthanum powder are obtained; s2, after uniform mixing, vacuum ball milling is performed to obtain first powder, and the first powder is sieved to obtain second powder; s3, pressing the second powder to obtain a metal cake; s4, sintering the metal cake in an inert gas atmosphere to obtain a grain refiner; the Al-V-B-La refiner is prepared through a sintering method, the distribution condition of a second phase in the grain refiner and the grain refining effect of the grain refiner are improved through the rare earth element La, the VB2 phase in the grain refiner with the La element added is more uniform in distribution, smaller in size and larger in number density, more second phases can play a role in refining, and the grain refining effect of the grain refiner is improved. And the problem that the refining efficiency is low due to the Si poisoning problem of a traditional grain refiner is solved, and therefore the better aluminum alloy grain refining effect is achieved.

The invention discloses a cerium-zirconium-based high-entropy oxide as well as a preparation method and application thereof. According to the cerium-zirconium-based high-entropy oxide, cerium and zirconium serve as main bodies, and meanwhile rare earth elements (lanthanum, praseodymium, neodymium and samarium) and transition metal elements (manganese, iron, cobalt, nickel, copper and zinc) are introduced to form a high-entropy solid solution with the equal molar ratio and containing 3-8 kinds of metal. In the cerium-zirconium-based high-entropy oxide, the cerium element and the zirconium element respectively account for 20%-40% of the total amount, and the other elements are respectively 10%-30% in an equimolar ratio. The cerium-zirconium-based high-entropy oxide catalyst prepared by the invention has excellent oxygen storage and release capacity and CO oxidation capacity, and the CO complete conversion temperature is 181 DEG C. The method adopts a simple coprecipitation process, is mild in condition and low in cost, and is suitable for large-scale application in the field of tail gas purification.

The invention relates to an A-site high-entropy double perovskite anode material and a preparation method and application thereof. The chemical general formula of the anode material is (Ln < 1 > < 0.2 > Ln < 2 > < 0.2 > Ln < 3 > < 0.2 > Ln < 4 > < 0.2 > Ln < 5 > < 0.2 >) A 'B2O5 + delta (wherein delta is greater than or equal to 0 and less than or equal to 1). Wherein Ln1 to Ln5 are five different lanthanide rare earth elements and jointly occupy the A site, and the A site elements are any five of Sm, Pr, Nd, La, Gd, Eu, Er, Dy, Te, Yb, Y and Sc; the A'site is composed of any two elements of Ba, Sr and Ca; and the B site is Co. According to the invention, the double perovskite structure can be effectively stabilized, the number of catalytic active sites of an OER reaction is increased, the TEC of a cathode is effectively reduced, the electro-catalysis ORR reaction activity is increased, the performance of hydrogen production by electrolysis of water of a single cell is improved, and the output stability of the cell is effectively enhanced.

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

The invention relates to a microbial growth activation accelerant based on rare earth elements as well as a preparation method and application thereof, and belongs to the field of resources and environments. The microbial growth activation accelerant based on the rare earth elements is prepared from the following components: 1 to 150g of a rare earth compound, 0.2 to 2g of pantothenic acid, 0.2 to 2g of nicotinic acid, 0.02 to 0.1 g of nicotinamide and 1000g of deionized water, the rare earth compound is one or combination of more of chlorides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium, nitric acid compounds and sulfuric acid compounds. A large number of cheap light rare earth elements are used as raw materials of the microbial accelerator, a new utilization approach is provided for the light rare earth elements, the light rare earth elements are converted into high-added-value products, pollution of the light rare earth elements to the environment is reduced, and meanwhile new elements are introduced into the field of microbial accelerators. More importantly, the preparation method of the microbial growth activation accelerant based on the rare earth elements provided by the invention is simple in production process and convenient for large-scale production.

The application relates to the alloy technical field and discloses a high-strength silver-copper alloy and a preparation method. Acidified carbon nanotubes are functionally modified, -NCO groups are introduced by reacting toluene-2,4-diisocyanate with surface active groups, and a plurality of carboxyl groups are grafted on the surface of the carbon nanotubes by reacting the -NCO groups with the hydroxyl groups of 4-hydroxyphthalic acid. The carboxyl groups can firmly adsorb lanthanum nitrate through coordination, avoid the separation of rare earth elements in the ball milling process with raw materials, ensure the uniform distribution, reduce the carbon nanotube agglomeration tendency, and improve the dispersity of the carbon nanotubes in the silver-copper alloy. The carbon nanotubes have extremely high axial strength and excellent conductivity, the load transmission and the conductive network effect can enhance the mechanical and electrical properties of the alloy material, the rare earth lanthanum is segregated at the grain boundary to form a pinning effect to refine the grains, the alloy strength is further improved, and the strength and the conductivity of the silver-copper alloy are synergistically improved.

The present invention provides defect-controlled fluoride crystals, a method for producing the same, and the use thereof. These fluoride crystals contain at least a rare earth element RE (RE is at least one element selected from the group consisting of cerium (Ce), praseodymium (Pr), lanthanum (La), and neodymium (Nd)), fluorine (F), and hydrogen (H), and have the same crystal structure as crystals represented by CeF3. A method for producing fluoride crystals according to the present invention comprises growing crystals from a raw material containing a rare earth element RE and a raw material containing fluorine (F) by a solvothermal method in the presence of at least one mineralizer selected from the group consisting of mineralizers containing an alkali metal element and / or an alkaline earth metal element, acid mineralizers, and mineralizers containing a normal salt.

Disclosed herein are rare earth element (REE) sensors comprising an REE binding element and a fluorescent component, which can be expressed on a cell surface. Also disclosed are systems and methods of recovering rare earth elements from a sample, the method comprising exposing an aqueous solution comprising one or more rare earth elements. Also disclosed are methods of discovering new, useful REE binding elements.

Disclosed is a composition comprising at least a cerium and zirconium based mixed oxide comprising zirconium, cerium, lanthanum and optionally at least one rare earth other than cerium and lanthanum; said mixed oxide exhibiting a high thermal resistance and are in particular capable of maintaining a large specific surface area even in a high temperature environment. Also disclosed is a process for the synthesis of such compositions.

The invention belongs to the technical field of metal material processing, and particularly relates to a chemical corrosion forming method of a titanium alloy straight rib pipe. In order to overcome the defects that in the prior art, a titanium alloy straight rib pipe is complex in manufacturing process, high in cost and poor in flexibility, the titanium alloy straight rib pipe manufacturing method comprises the steps that firstly, rare earth elements lanthanum and yttrium are added, and a titanium alloy pipe good in toughness, heat stability and fatigue performance is obtained through multiple times of vacuum melting; plating a metal protective film; carrying out chemical corrosion forming on a part which is not covered by the mask by utilizing an acidic corrosive liquid; and finally, the metal protective film on the surface of the pipe is removed through chemical stripping, surface finishing is conducted, and the titanium alloy straight rib pipe with the accurate size and various complex shapes is obtained. The method is easy to operate, low in cost, high in design freedom degree and suitable for small-batch and multi-variety customized production requirements; and the used electroplating liquid and corrosive liquid can be recycled, and the concept of green and sustainable development of the modern manufacturing industry is met.

The invention discloses a special ultrahigh corrosion-resistant high-pressure cast aluminum alloy for marine equipment and a preparation process of the special ultrahigh corrosion-resistant high-pressure cast aluminum alloy. The aluminum alloy is designed by taking aluminum as a matrix and synergistically adding silicon, magnesium, various transition elements and rare earth elements of cerium and lanthanum in a specific proportion. The preparation process sequentially comprises the steps of smelting and refining, high-pressure die casting, heat treatment and surface treatment. Through the unique component design and the systematic combination of the whole-process technology, the high-pressure casting manufacturability of the alloy is kept, meanwhile, the marine corrosion resistance and the mechanical property are comprehensively improved, and the alloy is suitable for structural parts such as marine ship engine parts in the severe environment.

The invention discloses a ceramic multi-surface metallization process optimization method and a metallized ceramic piece, and the ceramic multi-surface metallization process optimization method comprises the following steps: S1, ceramic surface pretreatment; s2, preparing a metallized coating; s3, coating of a coating layer; s4, drying and pre-sintering the coating; s5, formal sintering; through the ceramic surface pretreatment and the optimized sintering process, good metallurgical bonding is formed between the metallized layer and the ceramic matrix, the bonding strength is remarkably improved, external stress can be effectively resisted, and the service life of the metallized ceramic part is prolonged; by adding the nano titanium dioxide coated carbon nanotubes, the conductivity and bonding strength of the coating can be improved; by adding lanthanum oxide, rare earth elements can improve the microstructure of the coating and improve the compactness and corrosion resistance of the coating; due to the addition of the nano graphene, the coating has excellent electrical properties and chemical stability, and the conductivity and oxidation resistance of the coating can be enhanced.

The invention belongs to the technical field of catalyst preparation, and relates to a lanthanide-doped flaky binary metal catalyst, in particular to a preparation method and application of a binary PdPr catalyst. A one-step synthesis method is adopted, Pd and a metal precursor of a rare earth element Pr are evenly mixed with molybdenum hexacarbonyl and an n-caprylic acid solvent, after an oil bath reaction is carried out for a period of time, centrifugal collection and drying are carried out, and the flaky binary metal catalyst can be obtained. The preparation method disclosed by the invention is simple, few in steps and simple and convenient to operate. The prepared flaky binary PdPr catalyst has more excellent catalytic activity and stability than a monometal Pd catalyst and Pd black in the aspect of value-added conversion of waste plastics, can upgrade and convert the waste plastics into glycollic acid, and has better selectivity and yield.

The invention discloses a rare earth doped perpendicular magnetic anisotropy oxide thin film and a preparation method thereof, and relates to the field of hard magnetic rare earth element doped oxide thin film materials, the rare earth doped perpendicular magnetic anisotropy oxide thin film has (001) plane crystal orientation and comprises a substrate and a thin film layer, the substrate is MgAl2O4 (001), and the thin film layer is LaxNi1-xCo2O4 (001). According to the rare earth doped perpendicular magnetic anisotropy oxide thin film and the preparation method thereof, lattice strain caused by mismatching of ion radius sizes can be overcome, lanthanum is doped into a crystal structure of spinel oxide NiCo2O4, a radio frequency magnetron sputtering preparation process is adopted, La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 target materials are adopted, and the rare earth doped perpendicular magnetic anisotropy oxide thin film is prepared. A series of La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 films with different thicknesses are prepared, the obtained films have stable vertical magnetic anisotropy, the Curie temperature is above room temperature, and the films have excellent conductivity and good performance.

The invention discloses a defoaming agent with long foam inhibition time and a preparation method thereof, and relates to the technical field of defoaming agents, and the defoaming agent comprises the following components in parts by mass: 35-40 parts of rare earth modified organosilicon, 20-25 parts of temperature-sensitive double-control gel, 10-15 parts of complex enzyme loaded microspheres and 25-30 parts of a quantum dot modified multifunctional polymer. The lanthanide rare earth element is introduced, so that the strong stability of the active component of the defoaming agent is realized, the problem of poor durability of the defoaming agent in an extreme environment is solved, the defoaming agent can quickly and permanently eliminate foam, and the efficiency of the whole production process is improved.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking appliance. The cathode filament has a spiral structure, and a filament material of the cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in a circumferential direction of the filament core, a material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer. In the cathode filament, the material of the filament core comprises the lanthanum tungsten material, and the carbonized layer comprises the lanthanum tungsten carbonized layer, which reduces the work function of the cathode filament to a certain extent, improves the migration ability of rare earth elements in the cathode filament, and thus the electron emission ability of the cathode filament can be improved to a certain extent, so that the magnetron can adapt to more power requirements of the microwave cooking appliance.

The invention discloses a lanthanum-enhanced fluorine removal agent and a production and recovery method and application thereof, and belongs to the technical field of industrial wastewater treatment.The lanthanum-enhanced fluorine removal agent takes cellulosic fibers as an adhesive, alkaline earth metal salt inorganic powder as a basic adsorption component, and a compound of rare earth element lanthanum is additionally added as an active ingredient; the production process comprises three steps of mixing and stirring, forming and drying. The fluorine-containing wastewater is contacted with the fluorine removal agent, alkaline earth metal reacts with fluorine to generate insoluble fluoride, lanthanum compounds synchronously form a stable fluorine-lanthanum complex, and the fluorine ion concentration is reduced to 5 mg or below under the dual action; during fluorine recovery, a formed body adsorbing fluorine is separated, and a high-purity alkaline earth metal fluoride and lanthanum oxide mixed product is obtained after drying, sintering and cellulose removal, so that collaborative recovery of fluorine and rare earth resources is realized; the fluorine removal agent is good in raw material compatibility, controllable in preparation cost, high in fluorine removal efficiency and recovery rate and suitable for various fluorine-containing industrial wastewater treatment scenes.

A multilayer ceramic capacitor includes a capacitor body having a dielectric layer and an internal electrode layer, and an external electrode disposed on an outer surface of the capacitor body. The dielectric layer contains a plurality of dielectric grains, at least one of which has a core-shell structure including a core portion and a shell portion that surrounds at least part of the core portion. The dielectric grain includes barium (Ba), titanium (Ti), and rare-earth elements including lanthanum (La). In a measurement region extending from the interface between the core and shell portions to a depth of about 5 nm into the shell portion, an absolute value of the concentration gradient of lanthanum (La) is approximately 0.12 to 0.58 parts by mole per nanometer, based on 100 parts by mole of titanium (Ti).

The application provides a steam turbine blade ultrahigh-temperature coating and a preparation method thereof, and relates to the technical field of material surface treatment, and comprises the following components in mass ratio: yttrium stabilized zirconium 20-30 parts, titanium aluminum nitride 15-20 parts, lanthanum magnesium aluminum spinel 10-15 parts, nano cerium oxide 5-10 parts, cobalt-based alloy 10-15 parts, rare earth element mixture 1-5 parts, hexagonal boron nitride 5-10 parts, SiC nano particles 5-10 parts, and chromium carbide 2-5 parts. The synergistic effect of the lanthanum magnesium aluminum spinel and the rare earth element mixture greatly reduces the grain growth rate of the coating at high temperature, thereby improving the stability at extreme temperature. The protective layer formed by the decomposition of the chromium carbide and the SiC nano particles jointly inhibit the sulfur corrosion, further improve the stability, and ensure the performance of the coating under high temperature conditions.

The application relates to the technical field of brazing materials, in particular to a high-performance aluminum-based filler metal and a preparation method thereof. The high-performance aluminum-based filler metal comprises the following components: 5-15 wt% of silicon, 1-8 wt% of copper, 0.2-2 wt% of rare earth elements, 0.02-0.5 wt% of trace elements, 0.3-3 wt% of nano-enhanced phases and the balance of Al. The rare earth elements are a combination of lanthanum, cerium and neodymium; the trace elements are a combination of titanium, zirconium, boron and vanadium; and the nano-enhanced phases are a combination of nano-aluminum oxide and nano-silicon carbide. The preparation method comprises raw material preparation, composite smelting, belt casting and post-treatment. The aluminum-based filler metal has excellent wettability, flowability, joint strength, thermal conductivity and corrosion resistance. The preparation method has the advantages of short production cycle, energy saving and consumption reduction, stability and controllability, high preparation efficiency, low preparation cost, contribution to improvement of the market competitiveness of the material and meeting of large-scale demands in the field of high-end precision manufacturing.

The invention relates to a method for removing the actinium contained in an initial aqueous solution of rare earth chlorides resulting from ore processing, the method comprising the following steps: bringing the initial aqueous solution into contact with a water-immiscible organic solvent, the organic solvent comprising at least one cationic extractant, separating, by liquid-liquid extraction, the rare earth elements and the actinium, all of the rare earth elements except for all or some of the lanthanum and / or yttrium being extracted in the organic solvent, bringing the organic solvent, comprising all of the rare earth elements except for all or some of the lanthanum, and / or yttrium, into contact with an acid solution to produce an aqueous composition having a mass concentration of actinium, lanthanum and / or yttrium, relative to the other earth elements, that is lower than the mass concentration of actinium, lanthanum and / or yttrium of the initial aqueous solution, wherein the cationic extractant comprises at least one C8 to C20 carboxylic acid of formula (I): in which: R1, R2 and R3 are independently selected from the group comprising hydrogen, C1-C14 linear or branched alkyl substituted with at least one halogen atom or being unsubstituted, at least one saturated or unsaturated C5-C6 ring, and mixtures thereof, wherein the sum of the carbon atoms contained in R1, R2 and R3 is between 6 and 18.

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

This invention discloses a high-entropy rare-earth silicate ceramic powder and its preparation method. A flocculent precipitate is obtained through in-situ chemical co-precipitation via both forward titration (adding ammonium carbonate solution to a precursor solution) and reverse titration (adding the precursor solution to an ammonium carbonate solution). This precipitate is then repeatedly washed, dried, and calcined at high temperature to prepare a monoclinic high-entropy silicate powder. This invention arbitrarily selects five trivalent lanthanide rare-earth elements with different ionic radii and dissolves them into the high-entropy rare-earth silicate lattice, thereby significantly increasing the configurational entropy and lattice distortion of the sample, enhancing the phase structure stability, and resulting in a resonant frequency temperature coefficient closer to 0 ppm / ℃. The bulk sample of the high-entropy rare-earth silicate ceramic powder, after pressing and sintering, has a relative permittivity of 9.82~10.31, which meets the requirements for microwave dielectric ceramics in millimeter-scale communication.

The invention relates to the technical field of catalysts, in particular to a rare-earth-loaded walnut shell activated carbon catalyst, a preparation method thereof and application of the rare-earth-loaded walnut shell activated carbon catalyst in PE pyrolysis. According to the catalyst, walnut shells are used as raw materials, high-specific-surface-area activated carbon is prepared through pretreatment and alkali activation, and then a hierarchical pore structure is constructed through phosphorus anchoring and carbon dioxide secondary activation; sequentially carrying out lanthanum rare earth loading and dopamine prime coating to enhance the interface stability, and introducing a silicon-oxygen-phosphorus bridge and a weak Bronsted acid site through surface phosphorus crosslinking; and finally, loading cerium rare earth and carrying out programmed reduction in a reducing atmosphere to form an active phase rich in oxygen vacancies. The obtained catalyst has high specific surface area and optimized pore distribution, and rare earth elements are synergistically dispersed by La / Ce. When the catalyst is applied to PE pyrolysis, the initial cracking temperature can be remarkably reduced, the C2-C4 light olefin selectivity can be improved, aromatic hydrocarbon byproducts and carbon deposit generation can be inhibited, the cyclic stability is good, low-temperature efficient catalysis is realized, and the economical efficiency and environmental protection property of the pyrolysis process are improved.

A method for extracting a rare earth from a rare earth sample using magnetic-based concentration and separation of an ore containing a selected rare earth from a lanthanide series of elements. The method steps include selecting and grinding a rare earth sample into particle size from the lanthanide series of elements, treating the rare earth sample to variable weak electromagnets, treating the rare earth sample to a variable strong electromagnets and separating non-magnetic minerals. Then heating the rare earth sample in a thermal decomposition oven and then treating the rare earth sample to second variable strong electromagnets for a magnetic gradient ion exchange fixed bed separation. Finally, creating high grade rare earth oxides for further production of rare earth contained products.

The invention belongs to the technical field of alloy materials, and provides a lanthanum-samarium-containing light rare earth element magnesium-aluminum alloy and a preparation method thereof.The lanthanum-samarium-containing light rare earth element magnesium-aluminum alloy comprises, by mass, 7.0%-9.5% of Al, 0.85%-1.0% of Zn, 0.17%-0.4% of Mn, 1.5%-2.5% of LRE and the balance Mg and inevitable impurity elements, LRE is a light rare earth element, and LRE comprises La or Sm. According to the preparation method, the grain refinement effect of the magnesium-aluminum alloy is improved by adding a certain proportion of the zinc element, the manganese element and the cheap light rare earth element lanthanum or samarium into the magnesium-aluminum alloy, the high-strength and high-toughness alloy material is prepared through the preparation method, and meanwhile the purpose of saving the production cost is achieved.

The application belongs to the field of light high-conductive metal materials, and relates to a high-conductive aluminum alloy material for a new energy automobile bus conductor and a preparation method of the bus conductor. The aluminum alloy material is composed of: aluminum 97.22-99.35%, magnesium 0.35-0.8%, silicon 0.3-0.7%, iron ≤0.5%, lanthanum or cerium 0.05-0.3%, titanium ≤0.1%, manganese ≤0.03%, chromium ≤0.03%, copper ≤0.1%, boron ≤0.06%, and zinc ≤0.1%. The method takes 6101 aluminum alloy as a base material, and solves the profile cracking problem of the high-conductive aluminum alloy in the large-curvature deformation process through a process flow of trace element regulation, multi-stage strong cold crystallization, soaking rolling deformation, solid solution stress relief annealing, three-dimensional bending forming and artificial aging treatment. The application purifies the alloy melt, refines the alpha-Al grains and improves the strength and plasticity of the alloy through the composite addition of rare earth elements La or Ce and refining agents. The mechanical properties, conductive properties and good three-dimensional bending properties of the high-conductive aluminum alloy are simultaneously up to the standards.

The invention relates to the technical field of catalysts, in particular to a preparation method of a rare earth catalyst for petroleum cracking. The preparation method comprises the following steps: dissolving lanthanum nitrate and cerium nitrate, and reacting with a bidentate coordination agent and a functional ionic liquid to form a stable ternary complex solution; and mixing the solution with silica-alumina gel formed by a template agent, a silicon source, an aluminum source and a mineralizer, and carrying out hydrothermal crystallization, temperature programming roasting and other steps to prepare the catalyst. According to the preparation method, highly uniform dispersion and stable combination of rare earth elements in the molecular sieve carrier are realized through coordination and hydrogen bond anchoring synergistic effect. The prepared catalyst shows high heavy oil conversion rate, high and low carbon olefin selectivity, excellent hydrothermal stability and outstanding carbon deposition resistance and metal poisoning resistance in a petroleum cracking reaction, integrates performance advantages and industrial application economy, and is suitable for a large-scale petroleum cracking production scene.