30 results about "Silver catalyst" patented technology

The invention belongs to the technical field of electrocatalytic carbon dioxide reduction catalysts, and discloses a silver-based catalyst suitable for fluctuating carbon dioxide electrolysis and a preparation method of the silver-based catalyst. The preparation method comprises the following steps: uniformly and continuously dropwise adding a potassium hydroxide solution into a silver nitrate solution to prepare a silver oxide catalyst, and further applying a constant reduction current to the silver oxide catalyst in the presence of carbon dioxide gas for in-situ reduction to prepare the quintuple twin crystal silver-based catalyst. The preparation method disclosed by the invention combines precipitation titration and in-situ electroreduction methods, and has the characteristics of simplicity in operation, greenness, high efficiency and suitability for mass production; meanwhile, the catalyst can maintain high selectivity to carbon monoxide products in an extremely wide potential window range of 3V when being used in an electro-catalysis carbon dioxide conversion reaction, and is very suitable for being directly matched and coupled with fluctuating renewable energy sources.

The invention relates to a copper-indium-silver catalyst, a preparation method thereof and a method for preparing synthesis gas with an adjustable ratio of carbon monoxide to hydrogen through electrocatalysis of carbon dioxide. The preparation method comprises the following steps: dispersing a multi-walled carbon nanotube in water to obtain a dispersion liquid A; dispersing copper nitrate trihydrate, indium nitrate hydrate and silver nitrate in water to obtain dispersion liquid B; mixing the dispersion liquid A and the dispersion liquid B to obtain dispersion liquid C; adding alkali into the dispersion liquid C to obtain a mixed solution D; and filtering and drying the mixed solution to obtain the copper-indium-silver electrocatalyst. The invention also provides the copper-indium-silver catalyst prepared by the method and a method for preparing synthesis gas with an adjustable ratio of carbon monoxide to hydrogen by electrocatalysis of carbon dioxide. According to the copper-indium-silver electrocatalyst provided by the invention, an electron-rich Cu site is formed by utilizing the synergistic effect of three metals, CO2 adsorption and CO desorption are promoted, and HER is inhibited, so that CO2RR and HER are balanced, and the selectivity of carbon monoxide synthesis gas is effectively improved.

The invention belongs to the technical field of catalysts, and discloses a silver catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: a, preparing a silver-containing impregnation liquid; b, the alpha-aluminum oxide carrier is loaded into a rotor of a supergravity rotating packed bed, the loading amount of the alpha-aluminum oxide carrier is 200-500 g / L, the rotating speed of the rotor is 600-1500 r / min, the silver-containing impregnation liquid is sprayed to the inner edge of the rotor and fully makes contact with the alpha-aluminum oxide carrier in the rotor in the radial direction for impregnation, the alpha-aluminum oxide carrier is circularly impregnated with the silver-containing impregnation liquid, and the silver-containing impregnation liquid and the alpha-aluminum oxide carrier in the rotor are fully impregnated; the circulation flow of the silver-containing impregnation liquid is 0.5-1.0 L / min, and the circulation impregnation time is 5-30 min; and c, activating the impregnated alpha-alumina carrier to obtain the silver catalyst. The silver catalyst provided by the invention has obviously improved activity and stability.

The application discloses a carbon-loaded silver catalyst and a preparation method and application thereof. Silver nitrate and carbon are impregnated at room temperature, and then the obtained precursor is ground into powder at room temperature, and the carbon-loaded silver catalyst is obtained after calcination. The carbon-loaded silver catalyst can be applied to electrocatalytic reduction of carbon dioxide to carbon monoxide. The application mainly adjusts the calcination temperature in the preparation process to adjust the interaction between silver and carbon. The formation of the carbon-loaded silver with a carbon semi-coating structure not only strengthens the electron transfer in the reaction process, but also strengthens the adsorption and stability of an intermediate COO ‑ . In addition, the enhancement of the interaction between silver and carbon limits the reconstruction of silver in the reaction process, and realizes stability at a high current. The application in the reduction of carbon dioxide to carbon monoxide shows excellent performance in the reduction of carbon dioxide to carbon monoxide.

The invention belongs to the technical field of catalysts, and discloses an alpha-alumina carrier and a preparation method thereof, a silver catalyst for ethylene epoxidation and an ethylene oxidation method, the preparation method comprises the following steps: preparing a solid mixture; the solid mixture is put into a rotor to be evenly mixed, the rotating speed R1 of the rotor ranges from 100 r / min to 300 r / min, and the alternating interval of forward rotation and reverse rotation of the rotor ranges from 2 s to 10 s; s3, the rotating speed R2 of the rotor is adjusted to be 200-500 r / min, the alternating interval between forward rotation and reverse rotation of the rotor is 2-10 s, and the binder makes full contact with the solid mixture in the rotor in a spraying mode; s4, the rotating speed R3 of the rotor is adjusted to be 800-1500 r / min, the alternating interval between forward rotation and reverse rotation of the rotor is 2-10 s, the solid mixture added with the binder forms paste, and extrusion molding is conducted; and S5, drying the molded body, and roasting at high temperature to obtain the alpha-alumina carrier. The pore permeability of the carrier is improved, and the selectivity and stability of the silver catalyst are improved.

The present application relates to a kind of initiator of preparation triangular nano silver base ethylene oxide catalyst and its application, it is related to the technical field of ethylene oxide catalyst preparation, the initiator includes the following components by weight percentage: water 5~20wt%, polyvinylpyrrolidone 0.1~20wt%, normal alkane alcohol 65~85wt% and ethanol 1~20wt%;Wherein, the normal alkane alcohol is at least one in C3~C6 normal alkane alcohol.The present application is by using the initiator of this specific composition as the mother liquor system of silver base ethylene oxide catalyst impregnation liquid, the morphology control is applied to silver base ethylene oxide catalyst, after silver is uniformly dispersed in carrier, morphology is controlled synthesis, and triangular nano silver morphology silver base ethylene oxide catalyst is prepared, the preparation of controllable morphology controllable nano silver catalyst is realized, the contact area of nano silver with reactant is increased, to improve the performance of triangular nano silver base ethylene oxide catalyst.

The invention relates to the technical field of electrocatalytic reduction, and discloses a method for electrocatalytic reduction of CO2 by using a silver catalyst with a low coordination structure, and the method comprises the following steps: (1) preparing silver powder to obtain an Ag NPs electrode, and preparing an AgO electrode by using the Ag NPs electrode as a working electrode and adopting a cyclic voltammetry method; and (2) carrying out electrochemical reduction modification by taking the AgO electrode as a cathode electrode, and finishing the modification when the voltage is stable, so as to prepare the silver catalyst with a low-coordination structure. And (3) carrying out electrocatalytic reduction on CO2 by taking the silver catalyst with a low coordination structure as a cathode electrode. Through electrochemical in-situ modification, a low-coordination structure is introduced under the condition that the morphology structure and the valence of the silver catalyst are not changed, the catalytic activity and the catalytic stability are greatly improved, operation is easy and convenient, and large-scale industrial application is facilitated.

The present invention belongs to the field of catalysts, and relates to a silver catalyst for the production of ethylene oxide by ethylene epoxidation, characterized in that the silver catalyst comprises a porous inert carrier, metallic silver, a high-valence transition metal element, and a co-auxiliary element, and the high-valence transition metal element is closely associated with the metallic silver in the form of a compound, wherein based on the total weight of the silver catalyst, the silver content, calculated as elemental silver, is 10-40 wt%, the high-valence transition metal element is a molybdenum element and / or a tungsten element, and the content of the high-valence transition metal element in the catalyst is such that the weight ratio of the molybdenum element, the tungsten element, and the silver element satisfies the following relationship: MMo is 0-0.0021, MW is 0-0.0053, and F1 is 0.0015-0.0053, wherein MMo and MW are the weight ratio of the molybdenum element to the silver element in the catalyst and the weight ratio of the tungsten element to the silver element in the catalyst respectively, and F1=MW+2.52MMo, wherein the silver catalyst has a tungsten element retention rate and / or a molybdenum element retention rate of not less than 70%, preferably not less than 80%, and more preferably not less than 85% after being subjected to a water‑leaching treatment. In the present invention, by controlling the content of the high-valence transition metal element, the silver catalyst has the characteristics of rapidly reaching a high-selectivity state during the initial stage of operation.

The application belongs to the field of catalysts and relates to a method for preparing ethylene oxide by ethylene epoxidation. The method comprises the following steps: mixing a silver catalyst, ethylene, oxygen, a stabilizing gas and a chloride in a reactor to perform an ethylene epoxidation reaction; after the operation of the reactor, the concentration of the chloride is controlled to be stabilized at 2-5 ppm; when the concentration of ethylene oxide at the outlet of the reactor reaches 0.5-3.0 mol%, the concentration of the chloride is reduced to 0.1-2 ppm; the silver catalyst comprises an alpha-alumina carrier and an active component silver supported on the alpha-alumina carrier; the alpha-alumina carrier contains manganese elements, and the content of the manganese elements is 0.001-2.0 wt.% based on the weight of the alpha-alumina carrier.

This invention discloses a silver-catalyzed method for synthesizing benzo[d]isothiazol-3(2H)-one via sulfur-nitrogen atom exchange, belonging to the field of organic synthesis technology. The method uses benzodisulfonic acid ketone compounds and azide compounds as raw materials, and, under the action of a silver catalyst, inorganic base, and organophosphorus compounds, with acetonitrile as the solvent, undergoes a heated reaction followed by separation and purification to obtain the target product. This invention achieves molecular skeleton editing of benzodisulfonic acid ketone through S-N atom exchange. The reaction conditions are mild, require no inert gas protection, are simple to operate, exhibit good functional group tolerance, and achieve high yields. It can be applied to the later-stage transformation of active molecules and drug molecules, providing a new route for the efficient synthesis of benzo[d]isothiazol-3(2H)-one compounds.

This invention belongs to the field of catalyst preparation technology, and discloses a low-silver-content ethylene oxide catalyst with a silver-rich surface, its preparation method, and its application. The method employs an economical and industrially applicable low-silver-content high-efficiency catalyst preparation system, innovatively using a "nebulized spray fluorine impregnation-calcination" process. By precisely controlling the penetration depth of fluorine on the alumina support surface through atomized solution, the calcined support forms a gradient structure of "surface lamellar alumina - internal dense alumina," providing support for the preparation of the surface-rich silver catalyst. Utilizing the high specific surface area and adsorption activity of the surface lamellar structure of the support, combined with the low adsorption of the internal dense structure, silver is preferentially enriched on the support surface during impregnation, forming a "surface-rich silver - internal-silver-poor" distribution state. This overcomes the technical bottleneck of low internal silver utilization caused by the uniform distribution of silver in traditional catalysts.

The invention belongs to the technical field of catalysts, and discloses a silver catalyst and a preparation method and application thereof, and the mass content difference of silver inside and outside silver catalyst particles of the silver catalyst is 0.02%-7.00%, preferably 0.02%-6.50%. The carrier particles are uniform in external and internal morphology, transparent in pore channels and uniform in strength, and active center silver particles outside and inside the silver catalyst particles are uniformly dispersed; therefore, the prepared silver catalyst has good catalytic performance.

The present application relates to a kind of silver catalytic oxidation preparation sulfoxide method, first preparation is supported silver catalyst, under the action of this silver catalyst, catalytic hydrogen peroxide oxidation sulfide preparation sulfoxide.The silver catalyst prepared by this method has high stability and can be recycled multiple times.It catalyzes the oxidation of sulfide to obtain sulfoxide with high efficiency.Silver catalytic oxidation of sulfoxide reaction process has the advantages of high efficiency and high selectivity, and the catalyst is easy to recover, and is friendly to the environment.The product is easy to separate, and has good industrial application prospect.

The invention belongs to the field of catalysts, and relates to a silver catalyst for producing ethylene oxide through ethylene epoxidation, which is characterized in that the silver catalyst contains a porous inert carrier, metal silver, a high-valence transition metal element and a co-assistant element, and the high-valence transition metal element is tightly combined with the metal silver in the form of a compound; wherein on the basis of the total weight of the silver catalyst, the content of silver in terms of silver element is 10-40 wt%, the high-valence transition metal element is a molybdenum element and / or a tungsten element, and the weight ratio of the molybdenum element to the tungsten element to the silver element meets the following relation: MMo is 0-0.0021, MW is 0-0.0053, and F1 is 0.0015-0.0053; wherein MMo and MW are respectively a weight ratio of a molybdenum element to a silver element and a weight ratio of a tungsten element to the silver element in the catalyst, and F1 = MW + 2.52 MMo; wherein after the silver catalyst is subjected to water dissolution treatment, the tungsten element retention rate and / or the molybdenum element retention rate of the silver catalyst are / is not lower than 70%, preferably not lower than 80%, and more preferably not lower than 85%. By controlling the content of high-valence transition metal elements, the silver catalyst has the characteristic of quickly reaching a high-selectivity state at the initial stage of use.

The application discloses a kind of manganese dioxide supported monatomic silver catalyst and preparation method of positive electrode film, comprising the following steps: S1.the potassium permanganate of a certain mass, manganese sulfate monohydrate and silver nitrate are mixed with deionized water respectively to prepare solution with different concentrations;S2.manganese sulfate monohydrate solution is added to potassium permanganate solution and is magnetically stirred, in the process of stirring, add conductive carbon black, after uniform mixing, obtain mixed solution A;S3.continuously keep the magnetic stirring speed of S2, and drop silver nitrate solution to mixed solution A to obtain mixed solution B;S4.mixed solution B is transferred to reaction kettle and is hydrothermally reacted, after reaction, the substance is centrifuged, and precipitate is obtained, after drying and grinding, catalyst MnO2 / C-Ag is obtained, i.e.manganese dioxide supported monatomic silver catalyst.The application can realize that silver monatomic atom is uniformly dispersed on the surface of manganese dioxide, silver monatomic atom and carrier interact strongly, and preparation process is simple, and cost is low.

The application belongs to the field of silver catalysts, and particularly relates to a carrier for preparing a silver catalyst, a preparation method of the carrier, the silver catalyst, a preparation method and application of the silver catalyst. The carrier comprises an alpha-Al2O3 carrier, hollow-configuration zirconium oxide and tungsten oxide loaded on the surface of the alpha-Al2O3 carrier; and the content of each component relative to the alpha-Al2O3 carrier is as follows: 0.02-4.00 wt% of the hollow-configuration zirconium oxide and 0.002-0.500 wt% of the tungsten oxide. The application makes the alpha-Al2O3 carrier rough by acid etching on the surface of the alpha-Al2O3 carrier, sequentially carries out ordered loading of the hollow-configuration zirconium oxide and the tungsten oxide, and then carries out high-temperature calcination and solidification, so that the silver catalyst prepared therefrom has high selectivity and reaction activity, and is particularly suitable for the reaction of ethylene oxidation for producing ethylene oxide.

The invention belongs to the field of silver catalysts, and relates to a silver impregnation liquid for olefin epoxidation, a preparation method of the silver catalyst for olefin epoxidation, the silver catalyst prepared by the method, and applications of the silver impregnation liquid and the silver catalyst in olefin epoxidation. The silver impregnation liquid comprises the following components: 1) a silver amine complex; 2) steeping liquor stabilizer; 3) water; 4) an optional auxiliary agent; wherein the steeping liquor stabilizer is a small molecular organic matter which has electron withdrawing capability and contains carboxyl, ester group or anhydride functional group, and the content of the steeping liquor stabilizer is 0.01-20wt% on the basis of the total weight of the steeping liquor. The stability of the silver impregnation liquid is improved, suspended zero-valent silver nanoparticles in the impregnation liquid can be greatly reduced, the size distribution condition of activated catalyst silver particles is improved, and then the selectivity and stability of the catalyst are improved.

The invention belongs to the technical field of catalysts, and particularly relates to a confined silver catalyst for preparing ethanol through electroreduction of carbon dioxide and a preparation method and application of the confined silver catalyst. The confined silver catalyst is obtained by roasting a silver salt solution serving as a precursor through an impregnation method, and silver clusters and monatomic silver are formed in pore channels of mesoporous carbon. The confinement silver catalyst has high catalytic activity and shows excellent performance in CO2RR, the non-copper-based catalyst is adopted for electrochemical reduction of CO2 to generate ethanol, the Faraday efficiency of ethanol can reach 15.3%, and the ethanol generation rate reaches up to 99.4 [mu] mol.h <-1 >. Cm <-2 >.

This invention belongs to the field of industrial catalysts, and relates to an α-alumina support and its preparation method, as well as a method for producing ethylene oxide via silver catalyst and ethylene epoxidation. The α-alumina support has the following characteristics: α-Al₂O₃ content is above 90% by weight; crushing strength is 80–200 N / particle; specific surface area is 1.0–3.0 m² / particle. 2 / g; water absorption rate 30-70%; pore volume 0.30-0.75mL / g; the pore distribution curve has a bimodal structure, including macropore peaks and micropore peaks, with pores of 1.5-2.5μm accounting for more than 95% of the total pore volume of the micropore peaks; and plate-like crystals with a crystal size of 3-5μm accounting for more than 90% of the total plate-like crystals. Compared with the prior art, the silver catalyst prepared on the α-alumina support provided by this invention, when used for the oxidation of ethylene to ethylene oxide, has the advantages of higher selectivity and stability while ensuring activity.

The invention discloses a composite carrier supported silver catalyst for catalyzing ethylene oxidation to prepare ethylene oxide and application of the composite carrier supported silver catalyst. According to the catalyst, an aluminum oxide-titanium oxide composite carrier is used for loading silver and an auxiliary agent to form a bifunctional catalytic system, the preparation time of the carrier is remarkably shortened through a microwave hydrothermal method, and the industrial efficiency is improved. A titanium oxide defect structure is introduced into the carrier, so that the interaction between the carrier and metal is enhanced, and the loss of auxiliaries and silver in a long-term reaction is effectively inhibited. The obtained catalyst is uniform in silver particle dispersion and controllable in particle size, shows excellent performance when being used in ethylene epoxidation reaction, and can achieve about 23.3% of ethylene conversion rate under the reaction conditions of 2-3 MPa, 200-300 DEG C, ethylene concentration of 20-35 mol% and oxygen concentration of 5-10 mol%, and ethylene oxide selectivity is stabilized at 90% or above and up to 96.7%. The catalyst provided by the invention has high activity, high selectivity and good stability, and is suitable for industrial application of ethylene oxide preparation through ethylene oxidation.

The invention provides a silver catalyst and a preparation method thereof, and the preparation method comprises the following steps: step 1, mixing a silver precursor, a dispersing agent and water to form a mixed solution, and then mixing the mixed solution with a reducing agent; step 2, performing phase splitting on the mixture obtained in the step 1, wherein the lower layer is nano Ag sol; step 3, mixing and drying the nano Ag sol and SiC, and then performing thermal shock treatment in a Joule heating device to obtain a silver catalyst; wherein the dispersing agent is at least one of polyvinylpyrrolidone, carboxymethyl cellulose and polyvinyl alcohol; the reducing agent is at least one of sodium borohydride, diisobutylaluminium hydride and lithium aluminum hydride. Nano Ag sol is loaded on a SiC carrier, and thermal shock treatment is combined. The number of active sites on the carrier is increased by controlling the size and distribution of Ag particles. In addition, the SiC carrier can conduct out heat generated in the ethylene epoxidation process in time, and aggregation of the active component silver is further avoided.

The invention discloses a preparation method and application of a composite photocatalyst guided by a ferroelectric polarization field. The preparation method comprises the following steps: synthesizing a layered ferroelectric material bismuth titanate nanosheet from a catalyst raw material through a molten salt method; the bismuth titanate nanosheet is subjected to surface etching treatment, a catalyst BT-HCL is obtained, nano Ag particles are loaded on the catalyst BT-HCL through a photodeposition method, and the silver-loaded catalyst is obtained. According to the invention, selective anchoring and uniform dispersion of Ag nanoparticles on the surface of the catalyst and in pores are realized by using a ferroelectric polarization field, agglomeration is avoided, spatial selective distribution of the Ag nanoparticles is realized, in gas-solid phase CO2 photocatalytic reduction, the CO yield can reach more than 16 times that of original Bi4Ti3O12, the selectivity is high, the stability is good, and the photocatalytic CO2 reduction performance of the Bi4Ti3O12 is improved.

The invention belongs to the technical field of silver catalysts, and discloses a preparation method of a silver catalyst for producing ethylene oxide through ethylene epoxidation, and the preparation method comprises the following steps: preparing a silver amine solution; uniformly mixing a silver amine solution, a water-soluble surfactant, an organic rhenium auxiliary agent, water, an optional alkali metal auxiliary agent and an optional co-auxiliary agent of a rhenium auxiliary agent to obtain impregnation liquid; impregnating a carrier in the impregnation liquid, leaching, drying and heating to obtain the silver catalyst, wherein the water-soluble surfactant is at least one of water-soluble fatty alcohol-polyoxyethylene ether, water-soluble alkylphenol polyoxyethylene ether and water-soluble fatty acid polyoxyethylene ester; the polymerization degree of polyoxyethylene in the water-soluble fatty alcohol-polyoxyethylene ether, the polymerization degree of polyoxyethylene in the water-soluble alkylphenol polyoxyethylene ether and the polymerization degree of polyoxyethylene in the water-soluble fatty acid polyoxyethylene ester are all greater than 5 and less than 15. The silver catalyst prepared by the method provided by the invention has high activity and selectivity.

The invention discloses a method for synthesizing benzo [d] isothiazole-3 (2H)-ketone through silver-catalyzed sulfur and nitrogen atom exchange, and belongs to the technical field of organic synthesis. According to the method, a benzobissulfonylphenol ketone compound and an azide compound are taken as raw materials, acetonitrile is taken as a solvent under the action of a silver catalyst, inorganic alkali and an organic phosphine compound, and a target product is obtained through heating reaction, separation and purification. According to the present invention, the molecular skeleton editing of the benzo [d] isothiazole-3 (2H)-ketone is achieved through the S-N atom exchange, the reaction condition is mild, the inert gas protection is not required, the operation is simple and convenient, the functional group tolerance is good, the yield is high, the method can be used for the later conversion of active molecules and drug molecules, and the new path is provided for the efficient synthesis of the benzo [d] isothiazole-3 (2H)-ketone compound.

This invention relates to a hydrogenation catalyst for levulinic acid, specifically a bimetallic lead-silver catalyst, its preparation method, and its application. The preparation method includes the following steps: S1: ultrasonic treatment of a substrate in distilled water; S2: using the substrate treated in step S1 as a working electrode, performing cathodic electrodeposition in an acidic electrolyte containing lead salt to obtain E-Pb@C; S3: placing the E-Pb@C obtained in step S2 in a solution containing silver salt to perform an in-situ exchange reaction to obtain the E-PbAg@C catalyst. Compared with the prior art, this invention solves the problem of poor performance caused by the difficulty in generating active species on Pb-based electrocatalysts in the prior art. The bimetallic lead-silver catalyst of this scheme is used for the electrocatalytic hydrogenation of levulinic acid, achieving both high space-time yield and high Faradaic efficiency at a relatively low reaction potential.

Use of a catalyst comprising a carrier, an active metal supported on the carrier, and an optional second metal supported on or added to the carrier, for the hydrodechlorination of trichloromethane, the catalyst being selected from: (i) a Pt-Mo / Al2O3 catalyst, where the carrier is alumina (Al2O3), the active metal is platinum (Pt), and the second metal is molybdenum (Mo); (ii) a Pt-Ag / Al2O3 catalyst, where the carrier is alumina (Al2O3), the active metal is platinum (Pt), and the second metal is silver (Ag); (iii) a Pt-Co / Al2O3 catalyst, where the carrier is alumina (Al2O3), the active metal is platinum (Pt), and the second metal is cobalt (Co); or (iv) an Ir / SiO2 catalyst, wherein the carrier is silica (SiO2), and the active metal is iridium (Ir).

The invention relates to a continuous process for producing ethylene oxide in the presence of an activated heterogeneous silver catalyst and to a production unit for carrying out said process.

The invention discloses a rare earth modified silver catalyst for preparing ethylene oxide through ethylene epoxidation as well as a preparation method and application of the rare earth modified silver catalyst. According to the catalyst, alpha-Al2O3 with the specific surface area being 5-15 m < 2 > / g and the pore volume being 0.3-0.8 cm < 3 > / g serves as a carrier, the active component is silver, the loading capacity is 10%-25%, the rare earth modification auxiliary agent is at least one of Nd and Y, the total loading capacity is 0.1%-1%, the cocatalyst is a compound system of K and Sr, and the total loading capacity is 0.01%-0.1%. The preparation method comprises the steps of carrier pretreatment, rare earth modification auxiliary agent loading, silver and cocatalyst co-loading and segmented roasting activation, the carrier is acidized through dilute nitric acid, and a silver precursor is complexed through an ethylene glycol-ethylenediamine complexing agent. High-dispersion loading of the silver particles is achieved through step-by-step loading and complexing regulation, deep oxidation side reaction is inhibited through the synergistic effect of the rare earth and the cocatalyst, the initial selectivity for the reaction for preparing ethylene oxide through ethylene epoxidation is larger than or equal to 98%, the activity retention rate is larger than or equal to 99% after continuous reaction is conducted for 1000 h, and the catalyst has remarkable industrial application value.

The invention discloses a silver-containing catalyst and a preparation method and application thereof and a methane dry reforming method, the catalyst comprises a YSZ carrier and an active component loaded on the YSZ carrier, the elements of the active component comprise a metal element M and Ag, and the metal element M is selected from group VIII elements. The catalyst disclosed by the invention has the characteristics of high stability, long service life and the like, is suitable for being used in the field of methane reforming, can keep the reaction activity in a long period (as long as 100 hours) under a high-pressure condition (10-40bar), and has excellent carbon deposition resistance.