412 results about "Methanation" patented technology

The invention discloses a hydroxyl-rich ruthenium / titanium dioxide catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, loading a ruthenium precursor on a titanium dioxide carrier by adopting an impregnation method or a deposition-precipitation method, and drying and calcining to obtain a Ru / TiO2 catalyst; and step 2, placing the Ru / TiO2 catalyst in an atmosphere environment containing water vapor or forming a physical adsorption water film on the surface of the Ru / TiO2 catalyst, and performing ultraviolet irradiation treatment to obtain the Ru / TiO2 catalyst. According to the method, water is physically adsorbed through ultraviolet light dissociation, hydroxyl is directly generated on the surface of Ru / TiO2 in an in-situ mode, the method is easy to operate, complex liquid phase treatment is not needed, and the stability of the generated hydroxyl under the subsequent high-temperature gas-solid phase hydrogen-rich reaction condition is obviously superior to that of hydroxyl introduced through a traditional method. The stable hydroxyl enriched on the surface serves as an effective Lewis base site and cooperates with a Ru active site, adsorption and activation of CO2 molecules are remarkably promoted, and therefore the catalytic activity of the CO2 methanation reaction is greatly improved.

The invention belongs to the technical field of alkane processing, and particularly relates to a process for preparing isopentene by dehydrogenation of isopentane, a catalyst and a tert-amyl alcohol preparation process. The process for preparing isopentene by dehydrogenation of isopentane comprises an isopentane dehydrogenation device and an isopentene separation device, in the isopentane dehydrogenation device, a dehydrogenation reactor is a fixed bed adiabatic reactor and is filled with a Pt-Sn-K / alumina type alkane dehydrogenation catalyst, the catalyst has hydromethanation performance under the CO2-containing dehydrogenation reaction condition, and the arrangement and operation of a dehydrogenation reactor group comprise a mode A, a mode B or a mode C; the isopentene separation device comprises a cooling separation system, a pressure swing adsorption separation system and an optional rectification system. The tert-amyl alcohol is further prepared from isoamylene under the conditions of a fixed bed hydration reactor, ethylene glycol monobutyl ether and other solvents, and the tert-amyl alcohol product is obtained through separation. The process is superior to the prior art on the whole, and has certain application prospects.

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 catalyst development, and relates to a cerium oxide-loaded non-noble metal catalyst for a carbon dioxide methanation reaction and a preparation method of the cerium oxide-loaded non-noble metal catalyst. The method comprises the following steps: firstly, obtaining a cerium oxide carrier through a hydrothermal reaction, secondly, impregnating non-noble metal nitrate serving as a precursor on the cerium oxide carrier through an impregnation method, and carrying out ultrasonic treatment, drying, calcining and other steps to obtain the cerium oxide supported non-noble metal catalyst. The prepared catalyst is low in cost and has excellent carbon dioxide methanation catalytic activity. By controlling the loading capacity and the loading type of the non-noble metal, a multi-site synergistic effect is realized, more active sites are exposed, and finally, the catalytic performance of the cerium oxide loaded non-noble metal catalyst for catalyzing methanation of carbon dioxide at low temperature is improved.

The invention provides an aluminum-doped NiCoCe catalyst, a preparation method thereof and application of the aluminum-doped NiCoCe catalyst in low-temperature CO2 hydrogenation methane preparation reaction, the preparation method comprises the following steps: (1) dissolving nickel nitrate, cobalt nitrate, cerium nitrate, aluminum nitrate and an alkaline precipitator in deionized water, and fully stirring the solution at room temperature to obtain a solution A; (2) putting the solution A into a reaction kettle, and crystallizing the mother liquid at a constant temperature for a certain time to obtain a solid-liquid mixture B; (3) centrifuging and washing the solid-liquid mixture B in the step (2) to obtain a precipitate C; (4) drying the precipitate C in the step (3) to obtain a precursor D; and (5) reducing and passivating the precursor D in the step (4) to obtain the catalyst. The catalyst prepared by the invention effectively solves the problem of low CO2 conversion rate in low-temperature CO2 methanation reaction, lattice distortion is promoted by introducing the Al element, the migration ability of lattice oxygen is increased, and the formation of a large number of oxygen vacancies is beneficial to improving the oxidation-reduction property of the catalyst.

To provide a methanation system which has good efficiency of conversion of carbon dioxide to methane even when gas containing a low concentration of carbon dioxide is used as a carbon dioxide source, and which enables simplification of equipment and reduction of installation area thereof.SOLUTION: Methanation equipment is provided, comprising: a dissolution tank exposing carbon dioxide-containing gas to an aqueous phase, thereby producing carbon dioxide-containing solution; a culture tank for culturing methane in culture solution, thereby producing methane; a carbon dioxide gas supply flow passage for introducing carbon dioxide-containing gas into the dissolution tank; solution transfer means transferring the carbon dioxide-containing solution produced in the dissolution tank from the dissolution tank to the culture tank; a hydrogen supply flow passage for supplying hydrogen to the dissolution tank or the culture tank; and a methane discharge flow passage for discharging the produced methane from the culture tank.SELECTED DRAWING: Figure 1

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 relates to the technical field of catalysts, in particular to a composite catalyst for methanation of carbon dioxide and a simple preparation method thereof.The composite catalyst is prepared from active metal Ni salt, rare earth metal Ce salt, metal additive Mg salt and metal precursor Al salt through the key steps of mixing, grinding, calcining and the like. The preparation process is simple, the operation is convenient, and the production difficulty and cost are greatly reduced; the process is energy-saving and environment-friendly, no waste liquid is generated in the whole process, the problem of environmental pollution of a traditional process is avoided, safety, high efficiency, greenness and no pollution are realized, and the preparation method meets the requirements of large-scale industrial production; when the prepared composite catalyst is applied to a carbon dioxide methanation reaction, the performance is excellent, the catalyst can show high catalytic activity under a low-temperature condition, and the reaction efficiency is remarkably improved; meanwhile, the selectivity to methane is extremely high, generation of by-products can be effectively reduced, and the application prospect is good.

The invention discloses an electric methane preparation catalyst compounded by Ni nanoclusters and ZrO2 with lattice embedded with Ru single atoms as well as a preparation method and application of the electric methane preparation catalyst. The electric methane preparation catalyst comprises a NiNCRuSA / ZrO2 bimetallic active site catalyst compounded by the Ni nanoclusters and the ZrO2 with the lattice embedded with the Ru single atoms. The electric methane preparation catalyst comprises a NiNCRuSA / ZrO2 bimetallic active site catalyst, the NiNCRuSA / ZrO2 bimetallic active site catalyst is of a ZrO2 composite structure formed by embedding Ru monatomic into Ni nanoclusters and crystal lattices, the Ni nanoclusters and the Ru monatomic are adjacently distributed on a ZrO carrier to form a synergistic catalysis structure, rich and efficient active sites are provided for catalytic reaction, and reactant adsorption and conversion are facilitated; in the subsequent CO2 methanation reaction, the Ni element quickly dissociates H2 and provides sufficient H *, Ru replaces ZrO2 to serve as an active site for CO2 adsorption and conversion, conversion of an intermediate of CO2 can be accelerated, the reaction activity is greatly enhanced through cooperation of the Ni element and the Ru, the reaction energy barrier is reduced, and the overall catalytic efficiency is improved.

The invention discloses a preparation method of a nickel-based reverse catalyst with an oxide layer coating structure and photo-thermal methanation application, the catalyst takes metal Ni for dissociating hydrogen as a carrier, a low-dimensional nano metal M oxide coating structure is loaded on the surface of the carrier to construct an M / Ni reverse catalyst, the metal M is one or two of Ce, Zr, Al, Ti, Zn and Mg, and the metal M is one or two of Ce, Zr, Al, Ti, Zn and Mg. And the molar fraction of the load phase metal M is 5-40% based on 100% of the molar fraction of all metals in the catalyst. Through a simple coprecipitation method, a continuous nickel metal phase with hydrogen dissociation capacity is prepared to serve as a carrier, a low-dimensional nano oxide is loaded to construct a reverse catalyst, an oxide layer coating structure is constructed on the surface of the catalyst, and the oxide layer coating structure and the loaded nano oxide form a heterojunction. The catalyst disclosed by the invention shows excellent photo-thermal catalytic performance under mild illumination of 0.7 W.cm <-2 > without an external heat source, the surface heterostructure of the catalyst enhances the photo-response capability under a low-light-intensity condition, and an efficient photo-thermal synergistic effect is realized.

The invention provides a preparation method and application of a reversed-phase nickel-based bimetallic catalyst, the reversed-phase nickel-based bimetallic catalyst is prepared by a sol-gel method, the catalyst comprises active metals Ni and M (M = Fe, Co and Ru) and a metal carrier N oxide (N = Ce, Zr, Al and La), the mass percentage of the active metals Ni and M is 50-95 wt%, and the mass percentage of the metal carrier N oxide is 5-50 wt%. The specific surface area of the catalyst is 10-800 m < 2 > / g, the pore volume is 0.01-9.80 cm < 3 > / g, and the pore diameter is 0.1-20.0 nm. The active metal and the metal carrier oxide are uniformly dispersed and have strong interaction. The provided sol-gel method can reduce the aggregation process to the greatest extent, generate smaller metal particles and expose more metal oxide interfaces. The problems that in the prior art, in preparation of the NxOy / NiaMb nickel-based bimetallic reverse-phase catalyst, the catalyst is prone to aggregation, and the process is complex are solved. The preparation method of the reverse catalyst can be applied to low-temperature methanation of carbon dioxide.

The invention relates to a non-sulfur-tolerant wide-temperature shift regulation and control process based on a coal natural gas methanation process, and belongs to the technical field of coal chemical industry. The process comprises the following specific steps: carrying out non-sulfur-tolerant wide-temperature shift reaction on purified raw materials for methanation reaction, namely carrying out adiabatic and / or isothermal CO shift reaction under the conditions that the temperature is 200-360 DEG C, the pressure is 1-10 MPa, the molar ratio of H2O to CO is 0.7-2 and the air speed is 3000-40000h <-1 >, reducing the CO concentration at the inlet of a methanation reactor by 30-70%, and then carrying out high-temperature reaction on the methanation reaction to obtain the high-sulfur-tolerant methanation reaction. The CO disproportionation reaction in the methanation reactor is avoided while the circulating gas is effectively reduced, the service life of the existing methanation catalyst is prolonged by more than 50%, and the shutdown frequency and the maintenance time are greatly reduced.

The invention relates to the technical field of catalytic material preparation, and particularly discloses a monatomic nickel loaded copper-cerium composite oxide as well as a preparation method and application thereof. According to the preparation method, citric acid is taken as a template, metal salt is taken as a precursor, and the Ni / CuO-CeO2 composite catalyst is formed through high-temperature expansion and air annealing. The catalyst is used for low-temperature CO2 methanation, the CH4 productivity of 80.4 mmol / g / h and the CH4 productivity of 1938 mmol / g / h are achieved at the temperature of 200 DEG C and the temperature of 300 DEG C respectively, and the CH4 selectivity is 99.5%. When a TiC / Cu film reaction tube is used for absorbing sunlight to heat the catalyst, the Ni / CuO-CeO2 composite catalyst shows a photo-thermal CO2 methanation rate of 2289 mmol / g / h under weak sunlight irradiation, and shows a stable CO2 methanation rate of about 356 mmol / h in a dark environment, so that the continuity of industrial production is guaranteed.

The invention belongs to the field of chemical engineering, and particularly relates to an HPCO methanation treatment system and a system isolation operation technology, the HPCO methanation treatment system comprises a raw material supply unit, a first methanation reaction unit, a second methanation reaction unit, a heat recovery unit and a load isolation unit; according to the invention, the load isolation unit is matched with the first methanation reaction unit and the second methanation reaction unit, the second methanation reaction unit is isolated from the system when being overhauled, and the raw material supply unit, the first methanation reaction unit and the heat recovery unit in the system still continue to work at the moment, so that the overall shutdown of the HPCO methanation treatment system is avoided; in an isolated operation process based on the system, heat of a reaction product of the first methanation reaction unit is effectively exchanged by regulating and controlling the second inlet regulating valve, the first bypass valve, the second bypass valve and the sixth control valve, and the problem that heat is unbalanced during independent operation of the first methanation reaction unit is effectively solved.

The invention 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 the following steps: (1) performing pyrolysis reaction on a modified biomass raw material in a pyrolysis reactor to obtain pyrolysis gas and solid biochar; (2) enabling the pyrolysis gas and water vapor to flow into a fixed bed reactor filled with a catalyst layer in parallel from bottom to top, carrying out methanation reaction to obtain product gas, enabling the product gas to flow out from the top of the fixed bed reactor, dividing the product gas into three streams, namely product gas A, product gas B and product gas C, cooling the product gas A to 40-50 DEG C, returning the product gas A to the fixed bed reactor, and enabling the product gas B to flow into the fixed bed reactor; the product gas B directly returns to the fixed bed reactor, and the reaction gas C is cooled and then is collected as biomass fuel gas. According to the preparation method, the content of methane in the fuel gas and the calorific value of the fuel gas can be remarkably increased.

The utility model discloses a zero-carbon glass kiln system which comprises a photovoltaic power generation device, an air separation device, a water electrolysis hydrogen production device, a mixer, a methanation device, a waste heat boiler I, a reforming device, a glass kiln, a waste heat boiler II and a dust removal and desulfurization device. The device is driven by green electricity to produce green oxygen, green nitrogen and green hydrogen; the flue gas of the glass kiln is cyclically enriched into high-concentration carbon dioxide (95.0 v% or above), the high-concentration carbon dioxide and green hydrogen are subjected to a methanation reaction to produce methane, and the methane, the carbon dioxide and water vapor are subjected to a reforming reaction to produce carbon monoxide and hydrogen; carbon monoxide and hydrogen are used as fuel of the glass kiln, green oxygen and carbon dioxide are mixed to form carbon-based oxygen-enriched combustion which is used as a combustion improver of the glass kiln, carbon-based oxygen-enriched combustion of the glass kiln is carried out, and redundant carbon dioxide is sold. According to the utility model, the purposes of greenness, energy conservation, almost no nitrogen oxide and zero carbon are 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.

To provide a methane production method in which a conversion ratio of carbon dioxide into methane is high.SOLUTION: There is provided a methane production method configured to: supply a raw material gas having a molar ratio (H2 / CO2) of carbon dioxide and hydrogen of 7-12, into a reaction vessel in which a temperature is set to 310-390°C; bring the raw material gas into contact with a catalyst which activates a methanation reaction for producing methane.SELECTED DRAWING: None

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.

To provide a methane production reactor enabling methane production with reduced energy consumption and superior methane conversion efficiency.SOLUTION: A methane production reactor according to an embodiment of the present invention comprises a honeycomb substrate and a catalyst layer. The honeycomb substrate includes partition walls defining a plurality of cells. The cells contain gas flow paths. The catalyst layer includes a methanation reaction catalyst for methanating by reacting carbon dioxide with hydrogen. The catalyst layer is provided on the surface of the partition walls so as to face the gas flow paths. The methanation reaction catalyst contains Ni as an active component and a cerium oxide support carrying the Ni. The honeycomb substrate contains cordierite. The cell density in the honeycomb substrate is 300 cpsi or more.SELECTED DRAWING: Figure 1

A methane synthesis system according to the present disclosure includes: a co-electrolysis part that obtains hydrogen and carbon monoxide by electrolyzing water and carbon dioxide, a methanation reaction part that obtains a product gas containing methane by a methanation reaction that uses the hydrogen and the carbon monoxide, and a cooler having a distribution channel in which a refrigerant capable of phase transition, is distributed. The cooler cools the methanation reaction part using heat of vaporization from vaporizing at least a portion of the refrigerant on an inside of the distribution channel.

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 present invention discloses a sewage treatment device, which includes a first tank body, a water inlet pipe, a second tank body, a water outlet pipe and a connecting pipe. The first tank body is provided with a first solid-liquid separation zone, a first treatment zone and an intermediate zone in isolation from bottom to top in sequence, and the output end of the water inlet pipe is connected to the solid-liquid separation zone; the second tank body is provided with an intermediate zone, a second treatment zone and a second solid-liquid separation zone in isolation from top to bottom in sequence, and the input end of the water outlet pipe is connected to the second solid-liquid separation zone; the connecting pipe is connected to the intermediate zone and the intermediate zone; after the pollutants in the sewage undergo a first round of filtration, hydrolysis, acidification, methanation and liquid-solid separation in the first treatment zone, they enter the second treatment zone for a second round of liquid-solid separation, filtration, hydrolysis, acidification and methanation, and finally purify the sewage, which can realize the function of non-powered sewage treatment and reduce operation and maintenance costs.