113 results about "Pt nanoparticles" patented technology

The invention discloses design and application of a colorimetric-catalytic signal enhancement combined graphene oxide nano-enzyme rapid pesticide residue detection platform, and belongs to the technical field of immunochromatography detection. Graphene (GO) is used as a substrate, 30 nm Pt nanoparticles are adsorbed on the surface of the substrate to provide a colorimetric signal, and gaps of Pt NPs are filled with 5 nm AuIr nanoparticles to enhance the catalytic performance of the substrate, so that the colorimetric / catalytic dual-signal enhanced nano-enzyme is prepared. The GO (at) Pt30-AuIr nano-enzyme is synergistically assembled with Pt NPs and AuIr NPs by utilizing the large specific surface area, excellent stability and dispersibility of GO, so that the catalytic performance of the system is remarkably improved. The method has the beneficial effects that a GO-Pt30-AuIr-LFA-based detection system can realize high-sensitivity dual detection on heavy metal cadmium ions (Cd < 2 + >) and pesticide residue imidacloprid (IMI) within 20 minutes, and the detection limit reaches the level of pg / mL. The detection method provided by the research shows significant application potential in the aspect of rapid screening of small molecules in a complex matrix, and a new technical approach is provided for food safety monitoring.

The invention discloses a catalyst for a high-temperature proton exchange membrane fuel cell as well as a preparation method and application of the catalyst. The catalyst of the high-temperature proton exchange membrane fuel cell comprises a carbon carrier and Pt nano-particles loaded on the carbon carrier, and at least part of the surface of the Pt nano-particles is coated with manganese dioxide. According to the catalyst of the high-temperature proton exchange membrane fuel cell, the Pt nano-particles are coated with the manganese dioxide, catalytic active sites of the catalyst can be protected after coating, the poisoning effect of phosphoric acid on the catalyst at high temperature is relieved, and the performance of the high-temperature proton fuel cell is improved. In addition, manganese dioxide not only can be used as a protective layer, but also can form a new proton conductor with phosphoric acid, so that a proton transmission channel of the membrane electrode under a high-temperature working condition is improved, and the performance of the high-temperature proton fuel cell is improved.

The invention discloses a Pt-based composite nanoparticle catalyst as well as a preparation method and application thereof, the catalyst comprises a V5O12 carrier and Pt nanoparticles loaded on the carrier, and the V5O12 is of a multi-stage layered nanoflower structure; the catalyst is obtained by in-situ generation of Pt nanoparticles on a V5O12 carrier. According to the catalyst disclosed by the invention, the superfine Pt nano-particles are loaded on the metal oxide V5O12, so that the activity and the stability of the catalyst are improved; in addition, the preparation method is simple to operate and low in cost, and large-scale production can be realized.

The invention belongs to the technical field of nano material heterojunctions, and particularly relates to a Co3O4 / ZnIn2S4 / Pt heterojunction array, a preparation method thereof and a gas sensor. The Co3O4 / ZnIn2S4 / Pt heterojunction solar cell comprises a substrate and a Co3O4 / ZnIn2S4 / Pt heterojunction array which grows on the surface of the substrate in situ, and the Co3O4 / ZnIn2S4 / Pt heterojunction array is composed of a Co3O4 nanowire, a ZnIn2S4 nanosheet and Pt nanoparticles. The Co3O4 / ZnIn2S4 / Pt heterojunction array is formed by a Co3O4 nanowire, a ZnIn2S4 nanosheet and Pt nanoparticles. The Co3O4 / ZnIn2S4 / Pt heterojunction array disclosed by the invention has good heterogeneous interface contact, and an efficient multi-interface charge transfer characteristic is realized. Due to abundant S vacancy active sites on the surface of ZnIn2S4 and the chemical sensitization effect of Pt nanoparticles, the adsorption activity of the heterojunction array to molecules is enhanced. The Co3O4 / ZnIn2S4 / Pt heterojunction array can be applied to gas sensing, and high-selectivity detection of triethylamine at the temperature of 200 DEG C is realized.

The invention discloses a method for synthesizing a platinum-based nitrogen-doped graphdiyne catalyst based on an atomic layer deposition technology and application of the platinum-based nitrogen-doped graphdiyne catalyst. Firstly, hexabromobenzene and calcium carbide are subjected to vacuum ball milling, calcination and purification to obtain a graphdiyne carrier, then the graphdiyne carrier and melamine are mixed and calcined to achieve nitrogen doping of the carrier, and then loading of platinum nanoparticles is accurately controlled through an atomic layer deposition technology. According to the method, the characteristics of an atomic layer deposition technology are utilized, deposition parameters and the number of cycles are controlled, uniform distribution and size control of Pt nano-particles on porous graphdiyne are achieved, and a nitrogen-doped graphdiyne carrier and the platinum nano-particles have a synergistic effect. The platinum-based nitrogen-doped graphdiyne catalyst prepared by the invention has the specific surface area of 734.8 m < 2 > g < 1 > and the average pore size of 8.68 nm, and shows excellent electrocatalytic activity and dynamic performance in reaction.

The invention provides a bismuth-based heterogeneous material for promoting healing of diabetic wounds and a preparation method and application thereof. The bismuth-based heterogeneous material comprises a bismuth-based porphyrin metal organic framework, and the surface of the bismuth-based porphyrin metal organic framework is modified with Au-Pt nanoparticles. According to the bismuth-based heterogeneous material disclosed by the invention, microenvironments of bacterial infection, high glucose, active oxygen damage, inflammatory disorder, pH rise and oxygen deficit of diabetic wounds are improved through multiple antibacterial effects and enzyme catalysis effects, so that the healing of the diabetic wounds is promoted.

The invention relates to the field of inorganic functional materials, and particularly discloses a corrosion-resistant layered Pt-C catalyst and a preparation method and application thereof. The nitrogen-doped carbon carrier, the spinel oxide and the Pt nanoparticles are arranged to form a novel corrosion-resistant catalyst, and through the synergistic effect of the spinel oxide AB2O4 and the nitrogen-doped carbon carrier N-Carbon, the electron cloud density on the surface of the carbon carrier is effectively reduced, the carbon corrosion problem of traditional Pt / C under high potential is inhibited, and the carrier stability is remarkably improved; spinel oxide is used as an anchoring point of platinum nanoparticles, the migration energy barrier of the platinum nanoparticles is improved, the platinum utilization rate is improved through an in-situ precipitation process, the comprehensive cost is reduced compared with commercial Pt / C, and due to the fact that the production process is simple and the production period is short, the production cost is reduced. The catalyst shows excellent oxygen reduction reaction catalytic activity and stability in zinc-air cells and fuel cells, the preparation method is simple, special equipment is not needed, and the catalyst has good industrial amplification potential.

The application provides a Pt-based catalyst with (1x2)-(110) surface structure for catalyzing CO oxidation and a preparation method thereof. The preparation method of the catalyst is as follows: an oxide carrier and a platinum source are ground and loaded, and after heat treatment under a specific atmosphere, Pt-carrier powder is obtained; then the Pt-carrier powder is calcined with a mixed gas of CO and O2 at a certain temperature for a certain time, so that a Pt-based catalyst with Pt surface with (1x2) structure for catalyzing CO oxidation is prepared in situ. The Pt-based catalyst has the following characteristics: the (1x2) structure of the (110) surface of Pt nanoparticles changes the gas adsorption behavior, and establishes double active sites respectively beneficial to adsorption of O2 and desorption of CO, so that the problem of 'CO poisoning' in the Pt catalytic reaction can be significantly relieved during catalytic oxidation of CO. Compared with other catalysts with other structures, the Pt-based catalyst with the (1x2) special structure has more excellent CO catalytic oxidation activity, and has more practical application value.

Disclosed herein is a method for producing a platinum (Pt) decorated single-layer transition metal dichalcogenide (TMD) composite. The method includes steps of, (a) mixing single-layer TMD nanosheets with a reducing agent, K2PtCl4, and water to form a mixture, wherein the reducing agent and the K2PtCl4 are present in a molar ratio of 3:2 in the mixture; and (b) irradiating the mixture of step (a) for about 0.1-2 hrs to allow the growth of Pt nanoparticles on the single-layer TMD nanosheets thereby forming the Pt decorated single-layer TMD composite. Also disclosed herein is a method of producing hydrogen from an aqueous solution. The method includes electrolyzing the aqueous solution in an electrochemical cell characterizing in having an electrode made from the present Pt decorated single-layer TMD composite.

This invention relates to the field of ceramic materials and their preparation technology, and particularly to a Pt-doped perovskite ceramic composite material, its preparation method, and its application. The Pt-doped perovskite ceramic composite material provided by this invention uses platinum (Pt) as the dopant phase, and combines a sol-gel assisted doping method with a two-step sintering process using solid-state methods to uniformly distribute Pt in nanoparticle form on Sm... 0.5 Sr 0.5 The ZrO3 ceramic grain boundary region (forming a grain boundary nano-Pt phase) enhances near-infrared reflectivity and reduces thermal radiation absorption while maintaining the stability of the main phase lattice. This invention reduces the thermal conductivity of the ceramic composite material while improving its high-temperature stability through the interfacial regulation effect of the grain boundary nano-Pt phase. This invention also significantly improves the toughness and crack resistance of Pt-doped perovskite ceramic composite materials by constructing Pt nanoparticles to "pinneck" cracks at the ceramic grain boundaries, thus overcoming the intrinsic brittleness of ceramic materials.

The present invention discloses a metal oxide-modified Pt / SiC catalyst, its preparation method, and application. The effects of different metal oxides and their contents on the catalyst activity are explored. By modifying the catalyst with metal oxides, the basic sites on the catalyst are increased, allowing Pt nanoparticles to be stabilized and highly dispersed on the SiC surface. Furthermore, the oxide modification enhances surface hydrogen overflow, increasing the active hydrogen concentration on the carrier surface and enabling selective hydrogenation of cinnamaldehyde at low Pt loading. Using oxide-modified SiC as a carrier allows for highly selective hydrogenation of cinnamaldehyde under mild conditions.

The application relates to a preparation method and application of a supported platinum-rhodium-copper core-shell nanometer alloy electrocatalyst. The preparation method comprises the following steps: mixing raw materials containing a platinum source, a copper source and a rhodium source, a surfactant and an oleylamine solvent to obtain a mixed solution; the mixed solution is heated to 160-280 DEG C and reacts for 0.5-8 h, and then is cooled; the cooled reaction solution is washed with acetic acid and centrifuged at a speed of not less than 8000 r / min; a product, namely platinum-rhodium-copper alloy nanoparticles, which does not contain the surfactant on the surface, is obtained; the amount of the acetic acid is not less than the volume of the reaction solution; the obtained product and the platinum source are put into the oleylamine solvent, mixed, heated, reacted, cooled and centrifuged to obtain PtRhCu@Pt nanoparticles; the PtRhCu@Pt nanoparticles are mixed with a carbon carrier to obtain a PtRhCu@Pt catalyst. The catalyst prepared by the preparation method has high coating degree of the platinum shell layer on the surface and uniform particle size.

The invention provides a molecularly imprinted material PtCo-MIP for kynurenine detection, a preparation method, application and a product, and belongs to the technical field of analytical chemistry. According to the invention, PtCo alloy is combined with a molecular imprinting technology; wherein the PtCo alloy has more excellent oxidase-like activity compared with Pt nanoparticles, and the molecular imprinting technology solves the problem of insufficient specific detection of a target factor by nano-enzyme by forming a cavity complementary with a kynurenine structure on the surface of the PtCo alloy, so that efficient and safe kynurenine specific recognition is realized, and the detection sensitivity is improved. And the blank of low-cost and high-specificity detection technology in objective diagnosis of depression is filled. The kynurenine detection kit has an extremely wide detection range on kynurenine, and the detection range and the sensitivity are far better than those of an existing commercial kit; meanwhile, the anti-interference capability is excellent, accurate detection can be performed even in a complex matrix, the detection performance is excellent, and an accurate biological basis is provided for early diagnosis of depression.

The purpose of this invention is to provide a composite particle that singly blocks both ultraviolet light and infrared light at the same time, has good dispersibility and photothermal effect, and is highly safe. The present invention relates to a long ellipsoid-shaped composite particle comprising a Au nanorod, a Pt nanoparticle coating layer containing Pt nanoparticles provided on the surface of the Au nanorod, and a Au nanooutermost layer provided on the surface of the Pt nanoparticle coating layer.

The invention provides a propane dehydrogenation catalyst and a preparation method thereof, and relates to the technical field of petrochemical engineering catalysts. The raw materials of the propane dehydrogenation catalyst comprise a carrier, an active component and an auxiliary active component, the carrier is a spherical silicon-aluminum composite carrier prepared by taking an SUZ-4-AlPO4-11 composite molecular sieve as a raw material; the active component is Pt; the auxiliary active component comprises Pt nano particles, an auxiliary active component and a surfactant. The specific carrier, the auxiliary active component and the active component Pt interact with each other, and the propylene conversion rate, the propylene selectivity and the propylene yield of the propane dehydrogenation catalyst prepared by the specific preparation method are remarkably improved.

This invention discloses a Pt / O-NCP catalyst and its preparation method. It utilizes self-developed nanoporous carbon (NCP) as a support, which is modified to change the internal pores from a hydrophobic to a hydrophilic state. A special preparation method is then used to obtain the noble metal catalyst Pt / O-NCP. During catalyst loading, most Pt nanoparticles are located within the mesopores of the support, maximizing the direct contact between the polymer and Pt (sulfonic acid poisoning). This solves the problems in existing catalysts where Pt nanoparticles are prone to dissolution and carbon corrosion under voltage fluctuations, leading to Pt growth and aggregation, thus avoiding the reduction in catalytic performance caused by a decrease in the active surface area of ​​the catalyst. Furthermore, this catalyst can also address the significant decrease in overpotential of ordinary carbon support materials under low humidity, resolving the typical performance degradation of PEMFCs under low humidity conditions.

To provide a material exhibiting high blood retention capability, allowing temporal observation, having excretability from the body, and offering high biocompatibility.SOLUTION: A surface-modified metal-containing silica particle is characterized by containing, inside the particle, a plurality of biocompatible molecule-modified metal nanoparticles in which Au nanoparticles or Pt nanoparticles are surface-modified with a biocompatible molecule having a thiol group and an amino group and / or a carboxyl group, and is characterized in that polyethylene glycol chains are present on the particle surface.SELECTED DRAWING: Figure 6

The present invention discloses a molecular sieve catalyst double-modified with a multi-metal oxide and platinum nanoparticles, and a preparation method and application thereof. The molecular sieve catalyst comprises FeCoO x -modified molecular sieve support and noble metal platinum nanoparticles uniformly embedded in the surface defect sites of the molecular sieve support; FeCoO x In the FeCoO x -modified molecular sieve support, Fe and Co are uniformly distributed in the pores of the molecular sieve support in the form of an oxide with an equal atomic ratio, and the Pt nanoparticles are embedded in the surface defect sites of the molecular sieve support and form a Schottky heterojunction structure with FeCoO. The Pt in the catalyst of the present invention has high activity and high selectivity for the hydrogenation of halogenated nitrobenzene to halogenated aniline under the action of Fe and Co promoters. At the same time, the preparation of the catalyst in the present invention innovatively uses a one-step instantaneous in-situ reduction method, which is simple and easy to operate, and provides a new idea for the catalyst design of a class of reactions for the highly selective preparation of corresponding halogenated anilines from halogenated nitrobenzenes.

The application discloses a hollow spherical composite catalyst Pt / MnO2 / MnCo2O4, wherein the MnCo2O4 is a hollow sphere with a spinel structure composed of manganese and cobalt double transition metal oxides, the diameter of the hollow sphere is distributed in 1-2 mu m, and the hollow sphere has a porous structure with many cavities in the inside. MnO2 nanosheet microspheres are uniformly attached to the MnCo2O4, and the diameter of the MnO2 nanosheet microspheres is 95-105 nm. Pt nanoparticles with a particle size of 2-20 nm are uniformly loaded on the MnCo2O4 and the MnO2. The Pt / MnO2 / MnCo2O4 is synthesized by a solvothermal method and calcination in an air bath to synthesize a hollow spherical MnCo2O4 carrier, and then the MnO2 and the Pt nanoparticles are loaded on the surface of the MnCo2O4 by a deposition-precipitation method and an in-situ reduction method. The hollow spherical composite catalyst can catalyze degradation of tetracycline in polluted water at room temperature, and the catalytic efficiency can still be maintained after repeated use.

This invention discloses a platinum-tungsten carbide-graphene layered cathode hydrogen evolution catalyst, its preparation method, and its application, belonging to the field of proton exchange membrane electrolysis for hydrogen production. The catalyst has a layered structure, formed by graphene, a tungsten carbide layer grown in situ on the graphene surface, and noble metal nanoparticles. The graphene forms a two-dimensional conductive network, the tungsten carbide layer is the intermediate layer, and the noble metal nanoparticles are the active centers; wherein the noble metal nanoparticles are Pt nanoparticles, Ru nanoparticles, or Ir nanoparticles. By utilizing the high-speed electron channel provided by graphene, the tungsten carbide layer as the electronic regulation and physical anchoring layer for the noble metal, and the noble metal nanoparticles as the final active centers, the three work synergistically to achieve high activity, high stability, and low noble metal usage.

This paper discloses a 3d transition metal M-rare earth metal R bicomponent carbon-supported Pt catalyst, its preparation method, and its application. It relates to the catalyst supported on carbon doped with Pt, its preparation method, and its application. This catalyst aims to address the poor catalytic activity and stability of existing Pt / C catalysts. The catalyst consists of Pt nanoparticles supported on an M-R bicomponent carbon support, where M is Fe, Co, Ni, or Zn, and R is Ce, Nd, or Gd. Preparation method: M and R ions are complexed with a nitrogen source ligand on a carbon surface and then carbonized at high temperature to obtain the M-R bicomponent carbon support. Then, Pt is loaded using a microwave reduction method to obtain the M-R bicomponent carbon-supported Pt catalyst. The mass activities of Pt / Fe-Ce-NC and Pt / Co-Ce-NC are 0.27 and 0.22 A / mg, respectively. Pt It is 2.8 and 2.3 times that of Pt / C, and can be used in the field of proton exchange membrane fuel cells.

The invention belongs to the technical field of biological detection, and discloses a rapid immunochromatography detection kit for gastrointestinal pathogenic bacteria based on a viral nano-enzyme probe. The invention discloses a nano-enzyme probe, the virus-shaped nano-enzyme probe provided by the invention takes Fe3O4 nano-particles as a core, Pt nano-particles and Au (at) Pt nano-particles are coated in sequence, a specific antibody is modified, and the nano-enzyme probe has a magnetic enrichment effect and a multi-catalytic-site characteristic at the same time; rapid capture and high-sensitivity quantitative detection of various gastrointestinal pathogenic bacteria in complex matrixes (river water samples, lake water samples and excrement samples) can be realized, and matrix interference in practical application is eliminated; and the kit has huge potential in the aspects of high-sensitivity field screening and clinical monitoring of infection of gastrointestinal bacteria (such as escherichia coli, salmonella and helicobacter pylori).

The application belongs to the field of batteries, and particularly relates to a Pt / S-TiO 2‑x @Ti self-supporting electrode and a preparation method thereof, nitrate electroreduction ammonia production application and Zn-NO3 ‑ Battery; the Pt / S-TiO 2‑x @Ti self-supporting electrode comprises a titanium substrate, an oxygen-defect titania array in-situ grown on the surface of the titanium substrate, and Pt nanoparticles and S atoms doped in the oxygen-defect titania array; wherein the oxygen defects and the S atoms construct a blocked Lewis acid-base pair; the Pt nanoparticles mediate the formation of a reverse hydrogen overflow channel. The electrode disclosed by the application can have excellent NO3 ‑ RR activity and selectivity, in addition, the material can effectively adapt to the characteristics of the Zn-NO3 ‑ Battery, and can exhibit excellent electrochemical performance.

This invention discloses a nanozyme-loaded biomimetic hydrogel, its preparation method, and its applications, belonging to the field of biocomposite materials technology. The preparation method includes the following steps: preparing Mn@Co@MOF powder, Mn@Co3O4 powder, and Pt nanoparticles; preparing Mn@Co3O4@Pt nanozymes; preparing a Mn@Co3O4@Pt nanozyme-PVA mixed solution; preparing an Alg-PBA hydrogel precursor; and obtaining the nanozyme-loaded biomimetic hydrogel. The nanozyme-loaded biomimetic hydrogel disclosed in this invention effectively regulates the bone inflammation microenvironment caused by diabetes, significantly reducing inflammatory responses and promoting bone tissue repair and regeneration. The nanozymes loaded in the hydrogel possess highly efficient catalytic performance, mimicking the catalytic function of enzymes and improving treatment efficiency. Simultaneously, the good biocompatibility of the nanozymes ensures the safety and effectiveness of the hydrogel in biomedical applications.

The invention discloses catalyst slurry for a high-temperature proton exchange membrane fuel cell (HT-PEMFC) as well as a preparation method and application thereof, and aims to solve the problem that phosphoric acid (PA) in the conventional HT-PEMFC is separated out from a proton exchange membrane and poisons Pt active sites of a catalyst layer, so that the performance of the cell is reduced. The catalyst comprises a carbon carrier, Pt nanoparticles loaded on the carbon carrier and a metal oxide coating the surfaces of the Pt nanoparticles, the catalyst slurry is composed of the catalyst, water, an alcohol dispersant and a long-chain polybenzimidazole (OPBI) binder with the EW greater than or equal to 106, and the catalyst slurry is prepared by compounding the components according to a specific mass ratio and carrying out multi-step ultrasonic dispersion. The slurry is sprayed on carbon paper, the slurry and a high-temperature proton exchange membrane are subjected to hot-pressing assembly to form a membrane electrode assembly (MEA), Lewis acid sites on the surface of the metal oxide can preferentially adsorb phosphate ions and protect Pt active sites, the oxygen reduction reaction (ORR) activity of a cathode is remarkably improved, proton impedance (1.06-1.15 ohm cm < 2 >) is reduced, the electrochemical active area (87-96 m < 2 > / g) is increased, the service life of a battery is prolonged, and the service life of the battery is prolonged. And the preparation process is simple and easy for industrial production.

The present invention provides a TiN-based electrochemical NO2 gas sensor and a method for preparing the same. The electrochemical NO2 gas sensor comprises a membrane electrode assembly, a working electrode sheet, a counter electrode sheet, and a cathode sealed gas chamber; wherein the membrane electrode assembly contains TiN. The electrochemical NO2 gas sensor of the present invention utilizes TiN material with a high specific surface area and NVs sites, significantly enhancing properties such as gas diffusion, adsorption, and catalytic reactions. Compared to conventional gas sensors that enhance gas response by loading Pt onto sensitive materials, this not only significantly reduces the cost of the gas sensor but also solves the long-term stability issue caused by the shedding and aggregation of Pt nanoparticles during prolonged operation. Furthermore, the sensor exhibits excellent gas selectivity.

The present invention belongs to the field of catalytic oxidation technology, and discloses a Pt composite catalyst modified in situ and its preparation method and application. The present invention introduces a Pt precursor into the confined space of SBA-15 and template P123 by solid phase grinding-solution infiltration method, calcines the template in an inert atmosphere, and prepares a carbon-modified Pt loaded SBA-15 catalyst in situ, and the obtained catalyst controls the particle size of Pt nanoparticles using the confinement effect of SBA-15, and in situ modifies carbon species in the SBA-15 pores, greatly improving the hydrophobicity of the catalyst carrier. In addition, the prepared catalyst can achieve a complete oxidation of ethylene for more than 7h at a maximum of 0°C, and after 20h, it can still maintain an astonishing 81.5% ethylene conversion and 71.6% carbon dioxide yield, with excellent catalytic ethylene oxidation performance.

The invention belongs to the technical field of nano catalytic materials, and particularly relates to an electron-deficient Pt nanoparticle / UiO-66 catalyst as well as a preparation method and application thereof. The method comprises the following steps: synthesizing 3-nanometer Pt nano-particles in advance, loading the Pt nano-particles on UiO-66 under a reduction condition, enabling the Pt nano-particles and the UiO-66 to form strong interaction and generate an electron-deficient effect of Pt, and forming the electron-deficient Pt nano-particles / UiO-66. Compared with Pt / UiO-66, the catalyst disclosed by the invention has the advantages that the performance is remarkably improved, and excellent cyclicity and stability are also shown. Meanwhile, in the oxidation process of methylbenzene and ethyl acetate, generation of aldehyde by-products can be reduced by 70% or above. The modification mode of the catalyst is gradually changed, and the modified catalyst not only shows the optimization of catalytic performance, but also can reduce the toxicity of byproducts, and has excellent economic and environmental benefits.

The invention discloses a method for preparing a Pt / La2O2CO3 nano-catalyst from La2O2CO3 loaded Pt nano-particles and application of the catalyst, and relates to the technical field of nano-catalyst preparation, the preparation method comprises the following steps: synthesizing a La2O2CO3 single carrier La2O2CO3-S or synthesizing a La2O3 and La2O2CO3 mixed carrier La2O2CO3-M; preparing a Pt colloid; the preparation method comprises the following steps: preparing a Pt / La2O2CO3-S catalyst or a Pt / La2O2CO3-M catalyst with different Pt loading capacities by adopting a colloidal deposition method; the prepared Pt / La2O2CO3-S catalyst and the prepared Pt / La2O2CO3-M catalyst are used for catalyzing CO2 hydrogenation to prepare CO. The preparation method has the beneficial effects that the preparation process of the catalyst is simple and convenient, the Pt / La2O2CO3-S catalyst and the Pt / La2O2CO3-M catalyst have relatively high catalyst activity, selectivity and stability, and the problems of relatively low activity and stability of a Pt-based catalyst at high temperature in a reaction for preparing CO by catalyzing CO2 hydrogenation and the like are solved.