33 results about "Lanthanum carbonate" patented technology

The invention relates to the field of biomedical application of inorganic materials, in particular to application of lanthanum carbonate in preparation of drugs for resisting liver cirrhosis and inhibiting liver inflammations, the drugs comprise lanthanum carbonate and pharmaceutically acceptable auxiliary materials, the drugs are ground and then mixed with food to prepare a drug mixture, and the drug mixture is prepared into the drug for resisting liver cirrhosis and inhibiting liver inflammations. The mass ratio of the lanthanum carbonate in the medicine mixture is 1-10%, and the mechanism of the lanthanum carbonate for treating the liver cirrhosis is as follows: interference or blocking of activation and proliferation of hepatic stellate cells, inhibition of extracellular matrix generation and promotion of extracellular matrix degradation. According to the invention, a rat liver cirrhosis model is constructed through chemical induction, and the effects of reversing liver cirrhosis and inhibiting liver inflammation are found when a rat is treated by taking lanthanum carbonate orally, so that a new candidate drug is provided for clinical treatment of liver cirrhosis.

The invention relates to the field of biomedical application of inorganic materials, in particular to application of lanthanum carbonate in preparation of a medicine for treating hepatic encephalopathy. According to the application of lanthanum carbonate in preparation of the medicine for treating hepatic encephalopathy, the medicine comprises lanthanum carbonate and pharmaceutically acceptable auxiliary materials, the lanthanum carbonate comprises any one or more of lanthanum carbonate hydrate and basic lanthanum carbonate, the medicine is ground and then mixed with food to prepare a medicine mixture, and the medicine mixture is prepared into the medicine for treating hepatic encephalopathy. The mass ratio of the lanthanum carbonate in the medicine mixture is 1-10%. According to the application, the blood ammonia is reduced based on the glutaminase, the hepatic encephalopathy is reversed by reducing the blood ammonia and systemic inflammation, and the liver function is recovered by regulating the inflammation, so that the hepatic encephalopathy is favorably cured, a good treatment effect is shown, and a new candidate medicine is provided for clinically treating the hepatic encephalopathy.

This invention discloses an antifouling membrane made of lanthanum-loaded carbon nanomaterials suitable for phosphorus recovery in wastewater, its preparation method, and its applications. The invention involves loading lanthanum carbonate octahydrate onto the surface of multi-walled carbon nanotubes (MWCNTs) to form lanthanum-loaded carbon nanomaterials (La@MWCNTs), which are then deposited onto the surface of a polyethersulfone-based membrane using vacuum filtration to form a self-supporting membrane. The prepared lanthanum-loaded carbon nanomaterial antifouling membrane possesses both phosphorus removal and recovery capabilities, exhibiting high efficiency in phosphorus removal from water. This facilitates phosphorus elution and recovery, effectively solving the problems of lanthanum-loaded carbon nanomaterial aggregation and recovery, and effectively avoiding the risk of lanthanum-based adsorbent leakage during phosphorus removal. Furthermore, the lanthanum-loaded carbon nanomaterial antifouling membrane operates within a low-pressure range, exhibiting low energy consumption and effectively mitigating membrane fouling caused by humic acid. It shows promising application prospects in wastewater phosphorus recovery and eutrophication control.

The invention relates to the field of photocatalysts, in particular to a lanthanum oxycarbonate-gallium oxide composite photocatalyst for catalytic reduction of carbon dioxide and a preparation method thereof.The preparation method comprises the following steps that S1, sodium carbonate, sodium fluoride and lanthanum nitrate hexahydrate are dissolved in deionized water and stirred and mixed at the room temperature, then a hydrothermal reaction is conducted, and a precursor is obtained; after cooling, filtering, washing and drying in sequence to obtain a sodium lanthanum carbonate precursor; s2, weighing gallium nitrate, mixing with the sodium lanthanum carbonate precursor, grinding, and uniformly mixing to obtain a composite precursor; and S3, in a protective atmosphere, carrying out temperature programming treatment on the composite precursor, and naturally cooling to room temperature to obtain the lanthanum oxycarbonate-gallium oxide composite photocatalyst. The photocatalytic CO2 reduction performance of the composite photocatalyst prepared by the invention is superior to that of single lanthanum oxycarbonate and gallium oxide catalysts, and the composite photocatalyst shows excellent application potential.

The invention provides a production method of lanthanum zirconate, and belongs to the technical field of inorganic non-metallic materials. According to the invention, an electric smelting method is adopted, during high-temperature smelting, a zirconia material and lanthanum oxide / lanthanum carbonate are fully subjected to a high-temperature liquid phase chemical reaction at high temperature, an all-La2Zr2O7-phase electric smelting lanthanum zirconate product can be obtained, and the all-La2Zr2O7-phase electric smelting lanthanum zirconate product can be processed into particle size sand and fine powder with various particle sizes or can be processed into crushing and grading powder for a high-temperature thermal barrier coating material according to the requirements of users. Compared with a La2Zr2O7 material prepared by a solid-phase reaction method, a precipitation method, a sol-gel method, a self-propagating combustion method, a hydrothermal synthesis method and the like, the lanthanum zirconate prepared by the method provided by the invention is high in volume density and low in porosity, can be processed into particles and fine powder / graded powder with various particle size levels, is good in high-temperature volume stability, and can be used for preparing the lanthanum zirconate material. As an electric melting material, the material has the characteristics of small reheating shrinkage and small high-temperature creep deformation.

The application relates to the biomedical application field of inorganic materials, and particularly relates to application of lanthanum carbonate in preparation of a medicine for treating hepatic encephalopathy. The application relates to application of lanthanum carbonate in preparation of a medicine for treating hepatic encephalopathy, wherein the medicine comprises lanthanum carbonate and pharmaceutically acceptable adjuvants, and the lanthanum carbonate comprises any one or more of lanthanum carbonate hydrate and basic lanthanum carbonate. The application is based on the fact that glutamine enzyme can reduce blood ammonia, and the hepatic encephalopathy is reversed by reducing blood ammonia and systemic inflammation, the liver function is recovered by regulating inflammation, thereby helping to cure the hepatic encephalopathy, and good treatment effect is shown, so that a new candidate medicine for clinically treating the hepatic encephalopathy is provided.

The application discloses a method for preparing hexagonal hydroxyl carbonate lanthanum by hydrothermal synthesis, which comprises the following steps: diluting lanthanum chloride solution as a bottom liquid with deionized water and adding lanthanum carbonate as a crystal seed in a precipitation reactor; adding a feed liquid and a precipitator into the precipitation reactor by using a parallel flow precipitation mode, generating lanthanum carbonate after precipitation reaction, controlling the input speed of the feed liquid and the precipitator to control the precipitation reaction time and adjust the pH value; taking out the precipitate lanthanum carbonate in the precipitation reactor, drying after filtration to obtain lanthanum carbonate as a precursor; adding the lanthanum carbonate and deionized water into a reactor to perform a hydrothermal synthesis reaction, washing the obtained final product with deionized water, and performing suction filtration or centrifugation to obtain a white solid; and placing the white solid in an oven, drying to obtain hexagonal hydroxyl carbonate lanthanum. The production process is simple, and the method is suitable for industrialized batch production of hexagonal hydroxyl carbonate lanthanum.

The invention belongs to the technical field of rare earth hydrometallurgy, and discloses a preparation method of lanthanum cerate for a reflective thermal insulation coating. Specifically, a molecular mixing reactor (supergravity) and autoclave (aging reaction) combined process is adopted, and sodium dodecyl benzene sulfonate, polyethylene glycol, polyvinylpyrrolidone and the like are adopted as dispersing agents, so that the problems that solid-phase preparation particles are relatively large, the local mixed alkali amount of a liquid phase is too large and the like are solved; the uniform mixing of the precipitant and lanthanum cerium ions and the preparation of nanoscale lanthanum cerate are realized; lanthanum carbonate cerium, lanthanum carbonate, ammonia water and ammonium bicarbonate are adopted as main raw materials of the process, so that the production cost is reduced from the raw materials.

This application relates to the technical field of catalyst preparation, specifically disclosing a highly stable and active methanation catalyst for syngas and its preparation method. The method includes the following steps: dissolving nickel and manganese salts in water to obtain solution A; mixing lanthanum carbonate tetrahydrate or lanthanum and cerium carbonate, polyethylene glycol 400, and water uniformly to obtain mixture B; uniformly dispersing composite powder and calcium salt in water, adding mixture B, adjusting pH, heating, aging, simultaneously adding solution A and carbonate solution, dynamically adjusting pH, aging, solid-liquid separation, washing, and drying to obtain a pre-supported body; sequentially impregnating the pre-supported body with potassium salt solutions of increasing concentration, drying, calcining, and cooling to obtain a catalyst precursor; uniformly kneading the catalyst precursor, binder, release agent, and water, followed by molding, curing, drying, reduction, and passivation to obtain the final catalyst. The catalyst prepared in this application exhibits excellent CO and CO2 conversion rates and CH4 selectivity.

The application belongs to the field of rare earth smelting, and particularly discloses a preparation method of low-chlorine precipitated lanthanum carbonate, which comprises the following steps: preparing a precipitant, a mixed solution of sodium bicarbonate and sodium carbonate and an additive A; adding bottom water and crystal seeds into a reaction tank; preparing a material solution, adding an additive B into the lanthanum chloride material solution; under heating, the precipitant and the material solution are added into the reaction tank in a parallel flow mode; after the reaction is completed, the precipitate is filtered out and washed with clean water for more than five times, and the obtained product is placed into an oven for drying. The obtained product is the low-chlorine precipitated lanthanum carbonate with REO of 52-56%, chlorine ions of 0.005%-0.015% and calcium ions less than 0.015%. The preparation method has the advantages of simple process and convenient operation, and can prepare the low-chlorine and low-calcium lanthanum carbonate from the high-concentration and high-calcium-content lanthanum chloride material solution used in industrial production; and the precipitated lanthanum carbonate has very low contents of chlorine ions and calcium ions, and can meet the requirements of the La2O3-4N grade in the national standard GB / T 4154-2015 after calcination.

This invention belongs to the field of polymer composite materials technology, specifically relating to a method for preparing and applying an antibacterial agent for ABS composite materials. The method involves reacting lanthanum acetate, sodium carbonate, anhydrous ethanol, and deionized water in a reactor to obtain solution A. Solution A is then filtered, washed, dried, and cooled to obtain lanthanum carbonate. The lanthanum carbonate is then calcined to obtain lanthanum oxide. Lanthanum oxide, linalool, 3-isocyanopropyltrimethoxysilane, anhydrous ethanol, and deionized water are reacted to obtain an antibacterial agent of the linalool / 3-isocyanopropyltrimethoxysilane / lanthanum oxide type. This antibacterial agent is then used in ABS to prepare antibacterial ABS composite materials. The antibacterial agent of this invention inhibits the metabolic activity of bacteria by interfering with their respiratory chain function. Furthermore, lanthanum ions, with their high positive charge density, adsorb onto the bacterial cell membrane surface, disrupting normal cellular physiological functions and thus killing the bacteria.

The invention relates to the technical field of high-temperature alloy precision casting, and discloses a gas turbine blade high-temperature alloy casting method which comprises the following steps: sequentially carrying out lanthanum nitrate dip-coating pretreatment and ammonium carbonate curing treatment on the inner wall of a shell, and converting lanthanum nitrate into a lanthanum carbonate solid interface layer in situ; sequentially dip-coating lanthanum borate surface layer slurry and gadolinium oxide isolation layer slurry on the curing layer to complete shell preparation; dewaxing, sintering and curing the shell at high temperature; high-temperature alloy molten metal is poured into the shell, and metallurgical bonding is formed between the lanthanum borate surface layer and the surface of the casting; keeping the lanthanum borate active layer on the surface of the leaf after shelling; and oxalate-phosphate composite sealing treatment is carried out on pores in the surface layer of the blade. According to the method, integration of casting forming and CMAS-resistant protective layer forming is achieved, the protective layer and the blade base body are metallurgically bonded, the bonding strength is high, micropores in the surface layer of the blade are effectively sealed, and a CMAS permeation channel is blocked.

The application relates to the technical field of precision casting of high-temperature alloys, and discloses a high-temperature alloy casting method for a gas turbine blade, which comprises the following steps: sequentially performing lanthanum nitrate immersion coating pretreatment and ammonium carbonate solidification treatment on the inner wall of a mold shell, converting the lanthanum nitrate into a lanthanum carbonate solid interface layer in situ; sequentially immersing and coating lanthanum borate surface layer slurry and gadolinium oxide isolation layer slurry on the solidification layer to complete mold shell preparation; performing dewaxing and high-temperature sintering on the mold shell; pouring high-temperature alloy liquid into the mold shell, forming metallurgical bonding between the lanthanum borate surface layer and the surface of the casting; leaving the lanthanum borate active layer on the surface of the blade after shell removal; and performing oxalate-phosphate composite sealing treatment on the surface layer pores of the blade. The application realizes the integration of casting and the formation of a CMAS-resistant protective layer, the protective layer is metallurgically combined with the blade substrate, the combination strength is high, the surface layer micropores of the blade are effectively sealed, and the CMAS infiltration channel is blocked.

This invention discloses a method for removing white phosphorus from soil. First, contaminated soil is mixed evenly with water, stirred, and then nitric acid solution is added. After stirring, a phosphorus removal agent is added, and stirring continues. The mixture is then filtered, freeze-dried, and the phosphorus removal agent is removed using a magnetic sieve to obtain treated soil. The phosphorus removal agent contains nano-ferric oxide, allowing it to separate from the soil via magnetic attraction after treating the white phosphorus, reducing the difficulty of separation and enabling reuse. The soil is treated with nitric acid, causing the white phosphorus to react with the nitric acid to produce phosphate ions. The addition of the phosphorus removal agent releases lanthanum carbonate from the surface. Lanthanum has strong Lewis acidity and can form strong ligands with phosphate, which has Lewis basicity, to adsorb phosphate ions from the soil, thus forming a complex. Simultaneously, the free amino groups on the chitosan surface can adsorb metals, further completing the adsorption of the complex.

The invention discloses a magnetic adsorbent for refining ester base oil and preparation and application methods thereof, the adsorbent comprises a magnetic material formed by compounding basic lanthanum carbonate and magnetic particles, the magnetic material is spherical, the sphere diameter is 150-600 nm, and the magnetic material can be rapidly separated from oil liquid under the action of an external magnetic field. The magnetic basic lanthanum carbonate adsorbent disclosed by the invention has high adsorption capacity and selectivity on acidic substances and various polar impurities in ester base oil; the oil-water separator has strong magnetism and can be quickly and thoroughly separated from oil under the action of an external magnetic field; and the preparation process is simple and easy for large-scale production.

This invention relates to a hexagonal basic lanthanum carbonate and its preparation method, belonging to the field of rare earth compound technology. It addresses at least one of the problems of existing methods for synthesizing hexagonal basic lanthanum carbonate, including the presence of impurity phases in the product, dependence on high-temperature and high-pressure synthesis conditions, high cost and energy consumption, long reaction cycles, and low production efficiency, which are unfavorable for large-scale continuous production. This invention uses a lanthanum salt solution and a mixed precipitant, controlling the molar ratio of NH3·H2O and ammonium bicarbonate in the mixed precipitant, as well as the ratio of the total amount of NH3·H2O and ammonium bicarbonate added to water to the amount of lanthanum ions, to carry out the precipitation reaction and aging. Under normal pressure and mild conditions, a single-phase hexagonal basic lanthanum carbonate is prepared, avoiding the high energy consumption and safety hazards caused by high-temperature and high-pressure conditions. The process is simple and suitable for large-scale production.

The application discloses a rare earth doped yttrium zirconium oxide spraying material and a coating preparation method and application, and belongs to the field of rare earth material preparation. The rare earth doped yttrium zirconium oxide spraying material comprises lanthanum cerium carbonate, yttrium carbonate, aluminum oxide, hydroxyethyl cellulose, dodecyl benzyl ammonium chloride, n-heptane, deionized water, peach gum powder and zirconium oxide; the mixed slurry is obtained by mixing and ball milling the components in the spraying material, then the mixed slurry is mixed and stirred with the peach gum powder, and then the rare earth doped yttrium zirconium oxide spraying material coating is obtained through spray granulation and plasma spraying. Compared with the original yttrium zirconium oxide spraying powder, the yttrium zirconium oxide is modified by using the lanthanum cerium carbonate and the aluminum oxide, the wear resistance of the spraying powder is improved, the original white coating can be changed into black, and the application prospect is achieved in the fields of electronic ceramics, cutters and gas nozzles.

The present application relates to the technical field of oxy-lanthanum carbonate, and discloses an oxy-lanthanum carbonate catalyst, a preparation method and application thereof, the oxy-lanthanum carbonate catalyst comprising hexagonal crystal phase oxy-lanthanum carbonate and hexagonal crystal phase oxy-lanthanum carbonate containing doping element R.The method comprises the following steps: (1) adding an alkali solution into a solution of a lanthanum source, and then performing solid-liquid separation and drying to obtain lanthanum hydroxide; (2) contacting a solution containing a compound of doping element R with the lanthanum hydroxide, and then performing drying; (3) performing calcination on the dried product of step (2) in a carbon-containing atmosphere to obtain the oxy-lanthanum carbonate catalyst.The catalyst prepared by the present application has a high carbon dihydrocarbon yield when used in a methane oxidative coupling reaction.

The application discloses a preparation method of thin sheet four-water lanthanum carbonate powder crystal based on microwave / ultrasonic technology, which comprises the following steps: (1) preparation of eight-water lanthanum carbonate, slowly drop sodium bicarbonate solution into lanthanum chloride solution, fully react for 2-5 hours at a reaction temperature of 30 DEG C; then, the final product is washed with water, filtered and dried to prepare eight-water lanthanum carbonate powder; (2) preparation of thin sheet four-water lanthanum carbonate powder crystal, the eight-water lanthanum carbonate powder prepared in the step (1) is placed in a solvent medium at room temperature, different microwave intensities are regulated to carry out rapid dehydration treatment; then, the product is peeled by means of high-frequency ultrasonic vibration, centrifuged and dried to obtain four-water lanthanum carbonate powder crystal product. The four-water lanthanum carbonate is prepared by means of microwave / ultrasonic technology, which can avoid the generation of basic lanthanum carbonate impurities, and the obtained four-water lanthanum carbonate is thin sheet and uniform in dispersion, and the purity is more than 99.5%.

This application provides a method for determining the in vitro phosphorus binding capacity of lanthanum carbonate chewable tablets, belonging to the field of mass spectrometry for separating substances into individual components for analytical testing. The method involves preparing a phosphate stock solution, pH medium, working linear standard solution, and test solution. ICP-MS is used to detect the working linear standard solution and the test solution, and the phosphorus binding capacity is calculated. Applying this method to the in vitro phosphorus binding capacity testing offers advantages such as simplicity, convenience, stability, high accuracy, and significantly improved sensitivity.

The present application relates to the technical field of oxy-lanthanum carbonate, and discloses an oxy-lanthanum carbonate catalyst, a preparation method and application thereof, the oxy-lanthanum carbonate catalyst comprising hexagonal crystal phase oxy-lanthanum carbonate and hexagonal crystal phase oxy-lanthanum carbonate containing a doping element.The method comprises the following steps: (1) adding an alkali solution into a solution of a lanthanum source, then performing aging, solid-liquid separation and drying to obtain lanthanum hydroxide; (2) under a protective atmosphere, contacting a solution of a compound containing a doping element with the lanthanum hydroxide, and then performing drying; (3) performing calcination on the dried product of step (2) under an atmosphere containing CO2 to obtain the oxy-lanthanum carbonate catalyst.The catalyst prepared by the present application has a high carbon dihydrocarbon yield when used in a methane oxidative coupling reaction.

A lanthanum oxycarbonate catalyst, and a preparation method therefor and an application thereof are provided. The lanthanum oxycarbonate catalyst contains a rod-shaped lanthanum oxycarbonate catalyst and a substantially parallelepiped lanthanum oxycarbonate catalyst. The lanthanum oxycarbonate catalyst can be used for efficiently performing a methane oxidative coupling reaction at a relatively low temperature.

The invention relates to the technical field of industrial furnace coatings, in particular to a rare earth doped composite solid solution energy-saving coating and a preparation method thereof.The rare earth doped composite solid solution energy-saving coating is prepared from, by weight, 100 parts of powder base material, 0.1-1 part of dispersing agent and 100-200 parts of binding agent; wherein the powder base material comprises the following raw materials in parts by weight: 60-80 parts of lanthanum cerium carbonate, 3-5 parts of cerium carbonate and 10-20 parts of neodymium iron boron waste residues; the powder base material is prepared by mixing cerium lanthanum carbonate, cerium carbonate, neodymium iron boron waste residues and an auxiliary agent and then performing high-temperature calcination. The invention provides a rare earth doped composite solid solution energy-saving coating which is a novel energy-saving material applied to an industrial furnace, is sprayed on the surface of a refractory material of a high-temperature kiln to form a layer of hard ceramic glaze shell, and plays roles in protecting a furnace body, prolonging the service life of the kiln, reflecting infrared heat energy in a hearth and improving the combustion rate of the kiln.

The invention discloses a preparation method of lanthanum carbonate particles, and belongs to the field of pharmacy. The lanthanum carbonate particles comprise the following raw material medicines: lanthanum carbonate, starch hydrolyzed oligosaccharide, colloidal silicon dioxide and magnesium stearate; the preparation method comprises the operation steps of premixing 1, dispersing, premixing 2, dry granulation, total mixing and sub-packaging. The lanthanum carbonate particles prepared by accurately weighing the material components according to the weight ratio and carrying out the operation steps of premixing 1, dispersing, premixing 2, dry granulation, total mixing and the like on the raw and auxiliary materials are relatively good in content uniformity and stable in content.

This invention belongs to the technical field of automotive steel manufacturing, specifically relating to a green, low-carbon high-strength automotive steel and its preparation method. The invention adds nickel-doped modified niobium carbide to the high-strength steel, dispersing it in the iron matrix to effectively improve the strength and toughness of the steel plate and increase its porosity. Simultaneously, the addition of Ca, Mg, and lanthanum and cerium carbonate as composite refining agents to the alloy melt improves casting quality and mechanical properties. Furthermore, precise control of the composition of elements such as C, Mn, Si, Cr, Mo, Cu, and Ti, combined with hot rolling, cold rolling, continuous annealing, or hot-dip galvanizing processes, enables the material to possess both high strength and excellent porosity.

The application discloses a fluorine removal agent for zinc hydrometallurgy leaching liquor based on rare earth waste recovery and preparation and application, relates to the technical field of fluorine removal of zinc hydrometallurgy leaching liquor, and is composed of nano magnetic iron oxide and rare earth carbonate prepared from rare earth waste recovery, wherein the rare earth carbonate is one or more of lanthanum carbonate, cerium carbonate and lanthanum cerium carbonate; the molar ratio of Fe element to rare earth element is 1: (1-10); and the fluorine removal agent is Fe3O4@RE2 (CO3) 3 with a core-shell structure. The fluorine removal agent has high fluorine removal rate, low fluorine removal cost, less zinc loss, and good fluorine removal effect for high-fluorine and low-fluorine solutions. The fluorine removal agent has simple preparation method and low cost.

The invention relates to a preparation method of lanthanum carbonate tetrahydrate, which comprises the following steps: by taking an ammonium bicarbonate solution as a precipitator and a lanthanum salt solution as a raw material, adding the ammonium bicarbonate solution into the lanthanum salt solution (70-100 DEG C) in a forward precipitation manner, preparing amorphous lanthanum carbonate precursor precipitate after feeding is finished, and aging for 2-8 hours at the temperature of 10-59 DEG C to obtain the lanthanum carbonate tetrahydrate. Filtering, washing and drying the lanthanum carbonate tetrahydrate precipitate to obtain the lanthanum carbonate tetrahydrate compound. The method has the advantages of simple and controllable process, low preparation cost and high product purity, and is suitable for industrial production of pharmaceutical grade phosphate adsorbents.

The invention relates to the field of medicine preparation, and particularly provides a preparation method of lanthanum carbonate chewable tablets, which comprises the following steps: (1) washing a lanthanum carbonate raw material with water to obtain a lanthanum carbonate wet product; (2) performing staged vacuum drying on the wet lanthanum carbonate product to obtain a dried lanthanum carbonate product; (3) mixing the dried lanthanum carbonate with a molding auxiliary material, and granulating to obtain a granular product; and (4) mixing the granular product with a lubricant, and tabletting to obtain the lanthanum carbonate chewable tablet. According to the preparation method, the dissolution rate of the medicine can be increased, the medicine compliance can be improved, and the sensitivity of the dissolution behavior to the prescription and hardness change can be reduced.

The invention relates to the technical field of catalyst preparation, and particularly discloses a high-stability and high-activity methanation catalyst for synthesis gas and a preparation method of the high-stability and high-activity methanation catalyst. Comprising the following steps: dissolving nickel salt and manganese salt in water to obtain a solution A; uniformly mixing lanthanum carbonate tetrahydrate or lanthanum carbonate cerium, polyethylene glycol 400 and water to obtain a mixed solution B; uniformly dispersing the composite powder and calcium salt in water, adding the mixed solution B, adjusting the pH value, heating, aging, synchronously adding the solution A and the carbonate solution, dynamically adjusting the pH value, aging, carrying out solid-liquid separation, washing, and drying to obtain a pre-loaded body; sequentially dipping, drying, roasting and cooling a potassium salt solution with gradually increased concentration and the pre-loaded carrier to obtain a catalyst precursor; and uniformly kneading the catalyst precursor, a binder, a release agent and water, molding, curing, drying, reducing and passivating to obtain the catalyst. The catalyst prepared by the invention shows excellent CO and CO2 conversion rate and CH4 selectivity.