221 results about "Methanation" patented technology

The invention relates to the technical field of methanol catalysts, in particular to a catalyst for improving selectivity of methanol prepared from methane through proton regulation and a preparation method. The preparation method comprises the following steps: S1, adding Zn (NO3). 6H2O into deionized water to prepare a solution, adding a sodium hydroxide solution, washing and drying to obtain a product; s2, adding a product in the step S1 into hydrogen peroxide, and then washing and drying; s3, putting a product in the step S2 into ethanol, adding APTES, washing and drying; s4, putting a product obtained in the step S3 into deionized water containing DPA-MOF, and carrying out heating reaction in a closed environment; s5, adding a sodium hydroxide solution into the solution cooled in the step S4, and washing and drying a product; and S6, dispersing the product obtained in the step S5 into a deionized water solution of ammonium nitrate, drying and calcining. The catalyst prepared by the invention has efficient selective catalysis on methanol through efficient proton affinity regulation and control.

The invention provides a ruthenium-based carbon dioxide hydrogenation catalyst based on MoS2 as well as a preparation method and application of the ruthenium-based carbon dioxide hydrogenation catalyst. The carbon dioxide hydrogenation catalyst comprises silicon dioxide, ruthenium and molybdenum disulfide, and the ruthenium and the molybdenum disulfide are loaded on the silicon dioxide. Therefore, in the carbon dioxide hydrogenation catalyst, the molybdenum disulfide is used as an auxiliary agent, so that the generation of methane (CH4) can be remarkably inhibited while a high CO2 conversion rate is maintained, the reversion of a product from CH4 leading to carbon monoxide (CO) leading is realized, and the inherent core defects that an existing Ru-based CO2 hydrogenation catalyst is too high in methanation activity, low in CO selectivity and difficult to consider activity-selectivity at the same time are overcome.

The invention belongs to the technical field of power system operation and control, and particularly provides a microgrid distributed robust optimization scheduling method considering source load uncertainty and electricity-hydrogen-carbon coupling. Comprising the following steps: constructing an electricity-hydrogen-carbon-heat four-dimensional collaborative micro-grid energy flow framework comprising a multi-port alternating current and direct current bus, a hydrogen production storage and transportation subsystem, a carbon capture methanation subsystem and a cross-stage thermodynamic energy cascade network; establishing an IGDT-based source-load bilateral uncertainty dynamic pricing model, and selecting a risk avoidance or opportunity seeking pricing model as required; a multi-agent game double-layer interaction model with a micro-grid operator as a leader and a load aggregator and a charging station as followers is constructed, and a nested part can observe a Markov decision process; and a privacy protection multi-agent deep reinforcement learning algorithm in which a maximum entropy framework and a CTDE mechanism are introduced is adopted for solving. According to the method, the problem of low-carbon operation of the micro-grid in a source load uncertainty environment is solved, and collaborative improvement of economical efficiency, low-carbon performance and robustness is realized.

The invention belongs to the technical field of CO2 catalytic conversion, and discloses an in-situ reduction efficient CO2 methanation catalyst as well as a preparation method and application thereof. The efficient CO2 methanation catalyst NiA (CO3) xRe is formed by in-situ reduction of Ni and A coupled carbonate NiA (CO3) x, wherein A is selected from one of Mg, Ce and Al. NiA (CO3) xRe is prepared by a coprecipitation method. According to the present invention, the reaction equilibrium conversion is achieved at 300 DEG C in the reaction atmosphere with the CO2: H2: N2 volume ratio of 1: 4: 5 and the air speed of 150000 mL.gcat <-1 >. H <-1 >, the methane selectivity reaches 100%, the methane yield reaches 677.8 mmol.gcat <-1 >. H <-1 >, and the methane selectivity is still not reduced after the operation is performed for 100 h under the condition; compared with the prior art, the prepared catalyst greatly improves the high efficiency and stability of methanation catalytic reaction, the preparation process is simple, large-scale production is easy to achieve, the catalyst is matched with the temperature of coal-fired flue gas, energy does not need to be input again, efficient conversion can be completed, carbon emission is effectively reduced, and high-value products are obtained for use; and a favorable way is provided for realizing a carbon neutralization target.

A process for the co-production of proteins and biomethane comprising at least the steps of: producing biogas by methanation of methanogenic inputs, separating the biogas produced into biomethane and a carbon dioxide-rich stream containing at least 93 mol% carbon dioxide and up to 7 mol% methane, introducing the carbon dioxide-rich stream into a reactor comprising at least one bacterial strain and an aqueous culture medium, and culturing said at least one bacterial strain in said reactor to obtain a biomass comprising proteins.

The present invention relates to a process for producing a methane-rich gas having an operational production mode and an operational standby mode wherein the standby mode comprises directing a standby process gas comprising hydrogen and less than 0.1 vol% carbon oxide into contact with the material catalytically active for methanation.

The invention relates to the technical field of chemical equipment, and discloses a methanation fixed bed reactor. The methanation fixed bed reactor comprises a reactor wall with a multi-layer structure and a reaction chamber defined by the reactor wall, and the reactor wall with the multi-layer structure comprises a metal shell, a refractory layer, a heat insulation layer and an aerogel heat preservation layer; the heat insulation layer and the fireproof layer are sequentially arranged on the inner wall of the metal shell, and the aerogel heat preservation layer is arranged on the outer wall of the metal shell. And the thicknesses of the fireproof layer and the heat insulation layer meet the requirement that the temperature of the outer surface of the metal shell is lower than 300 DEG C. The fireproof layer and the heat insulation layer are used for preventing overtemperature of the reactor wall, the aerogel heat preservation layer is used for conducting heat preservation on the reactor wall, the situation that when the environment temperature changes, the temperature difference between the interior and the exterior of the reactor wall is too large, gas condensation is caused, and a reactor is damaged is avoided, and the aerogel heat preservation layer thermochromism can give an alarm in time.

The utility model discloses a system for preparing renewable natural gas by utilizing biomass, which comprises a biomass degradation system, a biomass combustion system, a biomass gasification system and a wind and light energy storage electrolysis system, the biomass degradation system comprises an anaerobic fermentation device, a purification device and a biogas storage tank I which are communicated in sequence, the biomass combustion system comprises a biomass boiler, a carbon dioxide trapping device, a methanation device I and a synthetic natural gas storage tank which are sequentially communicated, and the biomass gasification system comprises a gasification furnace, a methanation device II and a biogas storage tank II which are sequentially communicated. The wind and light energy storage electrolysis system comprises a wind power and photovoltaic power generation system and an electrolytic cell which are sequentially communicated. The biomass recycling system has the advantages that recycling treatment of different types of biomass is realized, and meanwhile, efficient development and utilization of biomass energy are also realized.

The application discloses a reverse cone type fluidized bed reactor for CO2 methanation, which comprises a shell and catalyst particles, the bottom of the shell is provided with a first gas inlet, the first gas inlet is used for feeding a first gas into the shell, the first gas is a mixed gas of CO2 and hydrogen, the top of the shell is provided with a gas outlet, the shell defines a reaction cavity, the reaction cavity comprises a conical cavity, the cross-sectional area of the conical cavity gradually increases in the upward direction, and the cross section of the conical cavity is perpendicular to the upward direction; the catalyst particles are arranged in the reaction cavity, and at least part of the catalyst particles are located in the conical cavity. According to the reverse cone type fluidized bed reactor for CO2 methanation, local heat accumulation caused by a large amount of heat release due to a fast reaction rate in the initial stage of the reaction can be avoided, heat is uniformly distributed in the conical cavity, local overheating is avoided, catalyst activity stability is ensured, the size of bubbles formed by impact flow of gas in the catalyst particles is reduced, and the methane conversion rate is improved.

The invention relates to a NiO-ZrO2 catalyst for low-temperature methanation of CO2 as well as preparation and application of the NiO-ZrO2 catalyst. The preparation process of the catalyst comprises the following steps: S1, dissolving soluble nickel salt, soluble zirconium salt and glycine in deionized water, and performing ultrasonic treatment; and S2, transferring the solution obtained in the step S1 into a reactor, heating, evaporating, concentrating, carrying out self-combustion reaction, and continuously calcining the obtained ash black fluffy solid powder to obtain the NiO-ZrO2 catalyst. Compared with the prior art, the method has the characteristics that the preparation process is simple and efficient, no wastewater is generated, and industrial production is easy to realize.

The present invention provides a thermal energy generation system and method that can reduce the difficulty of separating carbon dioxide and impurities from exhaust gas after a combustion reaction, while making maximum use of existing combustion equipment. [Solution] The thermal energy generation system 10 comprises a water electrolysis device 20, a methanation device 30 that generates methane and water by reacting carbon dioxide with hydrogen produced in the water electrolysis device 20, a combustion device 40 that burns the methane discharged from the methanation device 30 using a combustion gas containing oxygen discharged from the water electrolysis device 20, and a CO2 distribution unit 55 that distributes and supplies the carbon dioxide discharged from the combustion device 40 to the methanation device 30 and the combustion device 40, respectively. The methanation device 30 carries out the methanation reaction using carbon dioxide from the CO2 distribution unit 55. The combustion device 40 carries out the combustion reaction by incorporating carbon dioxide from the CO2 distribution unit 55 into the combustion gas.

The present application relates to the field of methane oxidation coupling reaction, and in particular to a methanation catalyst and a preparation method and application thereof.The catalyst provided by the present application can synthesize methane by using methane oxidation coupling reaction tail gas as raw material, realizes recovery and recycling of the raw material of the methane oxidation coupling reaction, improves the overall carbon atom utilization rate of the industrial application of the methane oxidation coupling reaction, reduces the production cost, and realizes sustainable production.

The invention discloses a system and a method for preparing green natural gas by coupling renewable resources with green hydrogen, and particularly relates to the field of preparation of green natural gas. Comprising a wind-light-green electricity supply and green hydrogen preparation module, a biomass gasification synthesis gas preparation module, a synthesis gas desulfurization purification module, a green hydrogen supplement and hydrogen-carbon ratio adjustment module and a high-temperature methanation synthesis green natural gas module. The wind, light and green power supply and green hydrogen preparation module is used for producing green hydrogen through wind, light and green power supply; the biomass gasification synthesis gas preparation module is used for treating agriculture and forestry waste biomass in a liquid deslagging fixed bed gasification mode to obtain synthesis gas; the synthesis gas desulfurization and purification module is used for performing desulfurization and purification on the synthesis gas. Full-chain zero-carbon circulation of green electricity-green hydrogen-green natural gas is achieved, the dual-carbon target requirement is met, the device investment and operation cost are reduced, and the resource utilization rate is remarkably increased.

A methanization device is provided for removing a saturated hydrocarbon from a feed gas containing methane and a saturated hydrocarbon by methanation, wherein a saturated hydrocarbon with at least two carbon atoms reacts with hydrogen and the saturated hydrocarbon is converted into methane. The methanization device comprises: at least two catalyst layers, each consisting of a catalyst for methanation, wherein the catalyst layers are arranged at intervals in the direction of flow of a mixed gas containing a feed gas and a hydrogen-containing gas; a hydrogen supply line for supplying a hydrogen-containing gas to the upstream side of the catalyst layer on the side furthest upstream in the direction of flow of the mixed gas;a feed line for supplying the feed gas to each space between two catalyst layers that are adjacent to each other in the direction of flow of the mixed gas, and to the upstream side of the catalyst layer on the side furthest upstream in the direction of flow of the mixed gas; and a cooler arranged between two adjacent catalyst layers in the direction of flow of the mixed gas, which cools the mixed gas exiting the catalyst layer on the upstream side of the two adjacent catalyst layers.

The application discloses a biological methanation system and method for sealing CO2 in a salt cave gas storage, and the methanation system comprises a salt cave cavity arranged underground, a first channel conveying device provided with a first channel which is arranged to extend from the ground to the salt cave cavity and is configured to input a biomass waste suspension into the salt cave cavity or output biomass reaction residues, and a second channel conveying device provided with a second channel which is connected with the salt cave cavity and is configured to input supercritical CO2 into the salt cave cavity or discharge methane from the salt cave cavity. The application can meet the requirement of sealing supercritical CO2 in the underground salt cave, and can realize energy and resource utilization of the sealed supercritical CO2, and the final product is high-quality biological methane gas which can be used as household and industrial fuel gas after simple treatment.

This invention belongs to the technical field of CO2 capture and resource utilization in coal-fired power plants, and relates to a CO2 capture-methanation system and method based on catalyst-coupled waste heat. It includes: a CO2 capture unit, comprising a fixed-bed adsorption tower and an adsorbent regeneration device, the fixed-bed adsorption tower being connected to the adsorbent regeneration device; a catalytic methanation unit, comprising a fixed-bed reactor, the fixed-bed reactor being connected to the adsorbent regeneration device; a waste heat utilization unit, comprising a heat exchanger and a heat transfer oil circulation system, the cold-side outlet of the heat exchanger being connected to the heat transfer oil circulation system, the heat transfer oil circulation system being connected to both the adsorbent regeneration device and the fixed-bed reactor; and a solid waste backfilling unit, comprising a mineralization reaction tank, the mineralization reaction tank being connected to the fixed-bed reactor and the adsorbent regeneration device. This invention achieves synergy between CO2 capture, conversion, waste heat utilization, and solid waste backfilling, improving the system's economic and environmental benefits.

The invention discloses a preparation method of a full-organic ionic liquid confinement nano catalytic material and application of the full-organic ionic liquid confinement nano catalytic material in photocatalytic CO2 methanation, and belongs to the technical field of photocatalytic materials. The invention aims to solve the problems that the existing photocatalytic material is small in specific surface area and insufficient in active sites due to difficulty in regulation and control of microstructure and pore structure, environmental and biological toxicity is caused by dependence on noble metal / transition metal, and preparation of CH4 by photocatalytic CO2 reduction is restricted. The method comprises the following steps: 1, preparing 5, 5 '-(benzo [c] [1, 2, 5] thiadiazole-4, 7-diyl) bipyridine aldehyde; 2, preparing a pyridine tricarboxylate ionic liquid; 3, PTZpy is prepared; 4, preparing PTZpy (+); and 5, preparing the IL (at) PTZpy (+) nano catalytic material. The catalyst is applied to preparation of methane by photocatalytic reduction of carbon dioxide under visible light irradiation and a pure water system. The method has a good application prospect in the fields of solar fuel preparation and carbon resource conversion.

The invention discloses a process and a device for preparing LNG (Liquefied Natural Gas) and co-producing carbon dioxide from coke oven gas, belonging to the field of chemical industry. The coke oven gas subjected to fine desulfurization is divided into two paths, the first path directly enters a methanation section, the second path enters a CO conversion tower, CO is converted into CO2 through a water gas conversion reaction, and H2 is generated at the same time; the converted gas is cooled by a heat exchanger I2 or a steam boiler and then enters an alcohol amine decarburization tower, CO2 is partially or almost completely removed by spraying an alcohol amine solution, and the alcohol amine solution is heated and regenerated to obtain high-purity CO2 as a chemical raw material; the decarburized gas and the first path of gas are converged and then enter a methanation section, and H2 reacts with CO and CO2 in three methanation reactors which are connected in series and in parallel to generate CH4. The device comprises a main pipeline, a CO conversion tower, a heat exchanger, an alcohol amine decarbonization tower, an alcohol amine regeneration tower, a methanation reactor and the like. According to the invention, large-air-volume circulation and a compressor are avoided, the cost is saved, high-purity CO2 is co-produced, the CO / CO2 content and temperature rise can be flexibly regulated and controlled, and temperature runaway is prevented.

The invention relates to a CO2 methanation catalyst and a preparation method and application thereof in the field of catalysts. The CO2 methanation catalyst comprises an active component, an optional auxiliary agent and a carrier. The active component can be selected from at least one of Ni, Fe and Co, the auxiliary agent can be selected from at least one of alkaline earth metal, transition metal or rare earth metal, and the carrier is a macroporous alumina carrier with high water absorption. The CO2 methanation catalyst is prepared by the following steps: impregnating components including active components and optional auxiliaries on a carrier by adopting an impregnation method, and then drying and roasting. According to the catalyst, under the action of the carrier, the dispersity of the active components is higher, the water absorption rate is higher, and the catalyst has good activity and can be used for CO2 methanation reaction.

The invention discloses a carbon capture coupling electrolytic hydrogen production methanation device and method. The device comprises a membrane separator, a synthesis gas compressor, an electrolytic bath, a 1 # methane synthesis reactor, a 2 # methane synthesis reactor, a methane purification system, a purification system and the like. The method can simultaneously couple an absorption method carbon capture technology, a water electrolysis hydrogen production technology and a carbon dioxide hydrogenation technology, and has the characteristics of high process flow integration level, realization of system wastewater recycling and the like.

The invention belongs to the technical field of combustible gas catalysis, and particularly relates to a combustible waste gas catalytic conversion system based on self oxygen supply and application. The catalytic conversion system includes a housing; a flue gas inlet and a flue gas outlet are respectively formed in two ends of the shell; an oxygen supply device, a CO catalyst layer, a non-methane CH compound catalyst layer and an H2 and methane mixed catalyst layer are sequentially arranged in a shell of the catalytic conversion system in the direction from a flue gas inlet to a flue gas outlet. The oxygen supply device is used for generating oxygen, and an oxygen supply agent for generating the oxygen in the oxygen supply device comprises any one of NaClO3 or KClO3. The combustible waste gas catalytic conversion system is used for solving the problems that in the existing chemical production process, leaked flue gas treatment cost is high, efficiency is low, and the occupied area is large; the device has the advantages of high catalytic efficiency, compact structure, small occupied area, low production cost and maintenance cost and the like.

The invention relates to a process for converting CO2 into methane, wherein hydrogen is contacted with a gaseous feed comprising CO2 in at least one methanation reactor comprising a catalyst bed at a catalyst bed temperature of 160°C to 550°C at a pressure of 0.1 MPa to 1 MPa, wherein the gas hourly space velocity is 10 m 3 / kg / hour to 50 m 3 / kg / hour, and wherein the H2 / CO2 molar ratio is 1 to 8, and wherein the catalyst comprises Ni metal deposited on a substrate made of uranium oxide having the formula UO 2+x , wherein x is 0.01 to 0.6, and wherein the mass content of nickel is 5% to 40% of nickel metal relative to the total mass of the catalyst.

The application relates to a ligand-regulated CuCe-MOF catalyst and a preparation method and application thereof in an electrocatalytic CO2 methane production reaction, and the preparation method comprises the following steps: mixing a Ce solution, an organic ligand solution and a structure directing agent to obtain a mixed solution; the organic ligand is terephthalic acid, 1,4-naphthalene dicarboxylic acid, diphenyl dicarboxylic acid or triphenyl dicarboxylic acid; the mixed solution is centrifuged and dried to obtain a cerium-based metal organic framework powder; the cerium-based metal organic framework powder is dispersed in a third solvent, ultrasonated, and soluble Cu salt is added, and after stirring, the third solvent is volatilized by heating to obtain the CuCe-MOF catalyst. The CuCe-MOF is prepared by using the organic ligand with a single benzene ring, a double benzene ring and a triple benzene ring, the dual synergistic optimization of ligand electronic effect and protonation efficiency is realized, the methane selectivity is greatly improved in the CO2 electro-reduction, and a brand-new synergistic regulation strategy is provided for the structural design and performance optimization of a CO2 RR electro-catalyst.

A methanation device for removing a saturated hydrocarbon from a raw material gas containing methane and the saturated hydrocarbon by means of methanation in which the saturated hydrocarbon having two or more carbon atoms is reacted with hydrogen to convert the saturated hydrocarbon into methane, the methanation device being provided with: at least two catalyst layers comprising a methanation catalyst, the plurality of gas inlets are arranged at intervals in the flowing direction of mixed gas containing raw material gas and hydrogen-containing gas; a hydrogen supply line for supplying a hydrogen-containing gas to the upstream side of the most upstream catalyst layer in the flow direction of the mixed gas; a raw material gas supply line for supplying a raw material gas to the upstream side of the most upstream catalyst layer in the flow direction of the mixed gas and between two catalyst layers adjacent to each other in the flow direction of the mixed gas; and a cooler which is provided between two adjacent catalyst layers in the flow direction of the mixed gas, and which cools the mixed gas flowing out from the upstream catalyst layer in the flow direction of the mixed gas among the two adjacent catalyst layers.

This invention relates to the field of catalyst preparation, and discloses a methanation catalyst, its preparation method and application, and a methanation method. The methanation catalyst contains a catalyst support and a nickel active component. Based on the total mass of the methanation catalyst, the catalyst support comprises 80-90 wt% by mass, and the nickel active component (calculated as oxide) comprises 10-20 wt% by mass. The average mechanical strength of the catalyst support is 35-80 N / mm. The particle mechanical strength dispersion coefficient of the catalyst support is in the range of 0-0.55. The catalyst support has a large specific surface area and pore volume. Combined with the supported nickel active component, it can improve the catalytic activity and selectivity of the catalyst. Simultaneously, the catalyst has high average mechanical strength, resulting in high CO conversion and methane selectivity in the methanation reaction.

This invention relates to the field of carbon dioxide methanation catalysis technology, and discloses a low-temperature carbon dioxide methanation catalyst, its preparation method, and its applications. The catalyst comprises an active component, a support, and an auxiliary agent; the active component is at least one selected from nickel, ruthenium, and rhodium; the support is nitrogen-doped carbon nanotubes; and the auxiliary agent includes at least one selected from transition metal elements and / or rare earth metal elements. The methanation catalyst of this invention exhibits excellent methanation catalytic activity at low temperatures and good stability at high temperatures, producing highly selective methane. The catalyst preparation method is simple and has promising prospects for industrial application.

The invention discloses a low-temperature high-activity carbon dioxide methanation catalyst and a preparation method thereof. The catalyst is of a supported structure and is represented by aNi-bMn / ZrO2, Ni is an active component, Mn is a promoter, ZrO2 is a carrier, a is larger than or equal to 5 wt% and smaller than or equal to 75 wt%, and b is larger than or equal to 0 wt% and smaller than or equal to 20 wt%. The catalyst is prepared by a Pechini method and comprises the following steps: mixing a metal salt solution containing nickel, manganese and zirconium with citric acid and ethylene glycol to form sol, drying to form gel, roasting and reducing to obtain the final catalyst. The low-temperature activity of the catalyst is remarkably improved by introducing a proper amount of manganese element, and the catalyst shows high CO2 conversion rate (up to 80%) and high CH4 selectivity (close to 100%) under the conditions of 225 DEG C and 0.1 MPa, and has good long-term stability. The method is simple in process and easy to amplify, and the obtained catalyst is excellent in performance under low-temperature and normal-pressure conditions and has a wide industrial application prospect.

The invention discloses a plasma-driven underground gasified coal gas coupling green hydrogen methanation system and method. The system comprises an underground coal gasification subsystem used for generating crude synthesis gas in situ; the high-temperature solid oxide water electrolysis hydrogen and oxygen production subsystem is used for producing hydrogen and oxygen by using green electricity; the gas purification and proportioning subsystem is used for purifying the crude synthesis gas and mixing the crude synthesis gas with hydrogen in proportion; the heat self-sustaining methanation reaction subsystem is used for converting the mixed gas into synthesis gas mainly containing methane under the action of plasma excitation and a catalyst and realizing self-heating operation through built-in heat exchange and waste heat recovery; the natural gas post-processing and conveying subsystem is used for purifying to obtain pipeline-level natural gas; and a waste heat recovery and process control subsystem. The method realizes deep coupling of in-situ conversion of coal resources, flexible regulation and control of green hydrogen and process enhanced methanation, and has the advantages of high energy utilization rate, strong capability of adapting to fluctuating working conditions and low carbon emission.

The present application belongs to the technical field of biomass gasification, and particularly relates to a preparation method of high-calorific-value biomass gas. The preparation method comprises: (1) pyrolysis of modified biomass raw materials in a pyrolysis reactor to obtain pyrolysis gas and solid biochar; (2) co-currently passing the pyrolysis gas and water vapor into a fixed bed reactor filled with a catalyst layer from bottom to top to perform a methanation reaction to obtain product gas, the product gas flowing out from the top of the fixed bed reactor, the product gas being divided into three streams, denoted as product gas A, product gas B and product gas C, the product gas A being cooled to 40-50 DEG C and then returned to the fixed bed reactor, the product gas B being directly returned to the fixed bed reactor, and the reaction gas C being cooled and then collected as biomass gas. The preparation method can significantly increase the content of methane in the gas and the calorific value of the gas.

The application provides a catalyst for CO2 low-temperature methanation and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the catalyst comprises the following steps: grinding CeO2, ZnCo2O4, yttrium nitrate and a particle size regulator after mixing, and then sequentially performing drying and calcination to obtain ZnCo2O4-Y2O3-CeO2; reducing the ZnCo2O4-Y2O3-CeO2 in a hydrogen atmosphere to obtain the catalyst. The catalyst has the advantages that on the one hand, the catalyst catalyzes the CO2 hydrogenation methanation reaction at a low temperature, and carbon deposition, sintering and agglomeration of the catalyst are avoided; on the other hand, the catalyst has a CO2 conversion rate not inferior to that of a traditional nickel-based catalyst and excellent methane selectivity. Therefore, the invention and implementation of the catalyst can realize the resource utilization of CO2 by coupling the capture of CO2 emitted by a traditional chemical enterprise with green hydrogen.