1132results about "Hydrocarbon from carbon oxides" patented technology

The invention belongs to the field of photocatalytic materials, and particularly relates to a high-entropy sulfide and a preparation method and application thereof. The high-entropy sulfide is granular, the molecular general formula is (MnaFebCocCudZe) xS, x is equal to 1, and the atomic ratio of Mn to Fe to Co to Cu to Zn is a: b: c: d: e of (1-2): (1-2): (1-2): (1-2): (1-2): (1-2): (1-2). The preparation method comprises the following steps: S1, dissolving metal salt in a mixed solvent of isopropanol and glycerol according to the atomic ratio of metal elements, and carrying out solvothermal reaction to obtain a precursor; and S2, dispersing the precursor in ethanol, adding thioacetamide as a sulfur source, and carrying out solvothermal reaction to obtain the high-entropy sulfide. The high-entropy sulfide disclosed by the invention is used as a photocatalytic material and shows excellent photocatalytic performance.

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.

Electrical power derived from a renewable energy source is used to perform water electrolysis to produce oxygen and hydrogen. A flue gas and heat are produced from combustion of a fuel using at least a portion of the oxygen generated by electrolysis. A feed stream including hydrocarbon oil is hydroprocessed using the generated heat and at least a portion of the hydrogen generated by electrolysis to produce a product including a saturated hydrocarbon. At least a portion of the flue gas is hydrogenated using at least a portion of the hydrogen generated by electrolysis to produce a second product stream including a hydrocarbon, an oxygenate, or both.

The invention relates to the technical field of catalytic materials, and particularly discloses a visible light photocatalyst and a preparation method thereof.The visible light photocatalyst comprises a core layer-shell layer-dynamic regulation and control layer three-stage structure; the core layer is heterojunction nano-particles formed by bismuth vanadate and bismuth oxyiodide, and the bismuth vanadate particles are uniformly dispersed on the surface of the bismuth oxyiodide to form a p-n heterojunction; the molar ratio of bismuth vanadate to bismuth oxyiodide in the core layer is 1: (0.5-2), and the particle size range is 30-80 nm; through an elaborately designed three-level structure and a dynamic regulation and control mechanism, the response efficiency and environmental adaptability of the photocatalyst to visible light are remarkably improved. A built-in electric field is formed by utilizing the energy band matching characteristic of bismuth vanadate and bismuth oxyiodide, so that the separation of photo-induced electron-hole pairs is effectively promoted, and the absorption boundary of visible light is expanded to 650nm.

The invention discloses an iron-based catalyst as well as a preparation method and application thereof. The synthesis method of the iron-based catalyst comprises the following steps: S1, carrying out high-temperature nitriding treatment on an iron-containing catalyst precursor in an ammonia gas atmosphere; wherein the iron-containing catalyst precursor contains an alkali metal element and an alkaline earth element; s2, the activated precursor is placed in a mixed atmosphere to be subjected to in-situ reaction treatment, Fe2N is converted into a Fe7C3-phase iron-based catalyst, and the Fe7C3 catalyst can be obtained, wherein the mixed atmosphere is a mixed atmosphere of a carbon source gas and H2, and the carbon source gas is a mixed gas of one or two of CO2 and CO. The problem of oxidative inactivation possibly occurring in the intermediate transfer process of the catalyst is thoroughly avoided in an in-situ generation mode, so that the initial activity and long-term stability of the catalyst are greatly improved.

The invention relates to the technical field of catalysts, and discloses a preparation method and application of a catalyst for preparing olefin through carbon dioxide hydrogenation. The preparation method comprises the following steps: fully dipping graphite in a mixed solution of dodecane and hexadecane, and taking out to obtain a catalyst carrier; and loading the Fe element and the Mg element into the catalyst carrier by adopting a method of co-precipitating and then roasting to obtain the catalyst for preparing olefin by hydrogenation of carbon dioxide. The catalyst prepared by the preparation method has high stability when being used in a reaction for preparing olefin through hydrogenation of carbon dioxide, can maintain high catalytic activity after long-term use, and has high olefin selectivity at the same time.

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 provides a continuous process for preparing aromatic hydrocarbon by supercritical carbon dioxide hydrogenation, which comprises the following steps: 1) adding a reaction liquid containing a solvent and a catalyst into a reaction kettle, spraying supercritical carbon dioxide and hydrogen into a reactor by adopting a Venturi ejector, and contacting with the catalyst in the reaction kettle to react; (2) after the reaction in the step (1), the gas in the reactor is sequentially subjected to primary condensation and secondary condensation to respectively condense the solvent and the water, the solvent of the primary condensation returns to the reaction kettle, the water of the secondary condensation is discharged, and the gas after the secondary condensation sequentially passes through an absorption tower and a desorption tower to capture non-aromatic hydrocarbon, the residual gas is used as recycle gas and returns to the Venturi ejector to enter the reaction kettle; and (3) pressurizing the reaction liquid discharged from the reaction kettle after the reaction in the step (1) through a circulating pump, feeding the reaction liquid into a heat exchanger to remove reaction heat, dividing the reaction liquid subjected to heat exchange into two streams through a cross-flow filter, feeding one stream of penetrating fluid into a rectification device, and feeding the other stream of concentrated liquid back to the reaction kettle for continuous reaction.

The invention provides an efficient technological method and system for preparing aromatic hydrocarbon through CO2 hydrogenation. The process method comprises the following steps: 1) mixing feed gas containing CO2 and H2 with recycle gas to obtain a mixture flow, and carrying out first-stage reaction on the mixture flow after heat exchange heating to obtain a first-stage reaction product; 2) performing heat exchange and separation on the primary reaction product to obtain a water phase, a gas phase and an oil phase, discharging the water phase out of the system, compressing most of the gas phase to obtain continuous circulating gas, and circulating the circulating gas back to the step 1) to continue the reaction; a small part of gas phase is discharged as purge gas; 3) distilling out light hydrocarbon from the top of the tower by rectifying the oil phase to obtain aromatic hydrocarbon-rich oil from a tower kettle; 4) heating the light hydrocarbon and then carrying out secondary reaction to obtain a secondary reaction product; and 5) carrying out heat exchange and separation on the secondary reaction product to obtain a gas-phase product and a liquid-phase product, discharging the gas-phase product as purge gas, and circulating the liquid-phase product back to the light component removal tower for rectification and separation to obtain aromatic hydrocarbon-rich oil. The first-stage reaction realizes high per-pass conversion of CO2, and the two-stage reaction is coupled to realize high selectivity of aromatic hydrocarbon.

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.

A hydrogen production system for producing a hydrogen gas product includes a geologic hydrogen source configured to provide a feedstock comprising hydrogen, nitrogen, and helium and purification equipment comprising two or more of: a pressure swing adsorption (PSA) device; a guard bed; a separation membrane; a reactive membrane; or a cryogenic separation device. The purification equipment is configured to receive the feedstock from the geologic hydrogen source and produce a hydrogen gas product, and production of the hydrogen gas product exhibits a carbon intensity score less than 3.0 kg CO2 eq / kg H2.

The invention relates to a Bi19Br3S27-NiSX catalyst. In the Bi19Br3S27-NiSX catalyst, an amorphous phase NiSX is loaded on a crystal phase Bi19Br3S27. The preparation method of the catalyst comprises the following steps: taking bismuth salt and nickel salt as raw materials, dissolving the raw materials into ethylene glycol, and then adding a sulfur source and a bromine source to obtain a mixed solution; and carrying out solvothermal reaction on the mixed solution to obtain the Bi19Br3S27-NiSX catalyst. The invention relates to a Bi19Br3S27-NiSX catalyst which is applied to production of ethylene through photo-thermal CO2 reduction. The catalyst has the beneficial effects that the catalyst has excellent sunlight full-spectrum light absorption property and photo-thermal conversion capacity, the surface activity of the catalyst is remarkably improved through introduction of the NiSX amorphous phase, the electron transfer efficiency in catalytic reaction is enhanced, the light energy utilization efficiency is improved through the synergistic effect of the multi-component catalyst, and CO2 is subjected to high-selectivity catalytic reduction to produce ethylene.

This invention relates to the preparation and application of oxygen-carrying catalytic bifunctional particles in chemical looping combustion technology, specifically the use of perovskite oxygen carriers for the hydrogenation of CO2 to produce ethylene, propylene, and butene. The catalyst has suitable CO2 adsorption and dissociation capabilities, inhibiting olefin re-adsorption, reducing secondary olefin reactions, and improving olefin selectivity. The catalyst effectively inhibits the secondary hydrogenation of primary olefins, regulating the production of high-value-added C2-C4 lower carbon olefins.

The invention discloses a nickel-based catalyst, a preparation method thereof and application of the nickel-based catalyst in carbon dioxide conversion. The catalyst is prepared by taking nickel oxide or a nickel-nickel oxide coexisting state as an active component and performing mild partial reduction activation at 200-450 DEG C. The nickel oxide and the nickel-nickel oxide coexisting phase have excellent low-temperature activity and stability. The catalyst has outstanding performance in reactions such as preparation of methane by hydrogenation of carbon dioxide, especially can realize high conversion rate (61.3-87.1%) and high methane selectivity (gt, 99.8%) at 200-250 DEG C, has good stability, greatly reduces the activation energy consumption of the catalyst, and has important industrial application value.

The present invention addresses the problem of providing: a technology related to a catalyst for a Fischer-Tropsch synthesis reaction (FT synthesis reaction) capable of, in the FT synthesis reaction, more easily obtaining a hydrocarbon having a specific number of carbon atoms, and a method for producing said catalyst; and a technology related to a hydrocarbon production apparatus and a hydrocarbon production method.　In order to solve said problem, provided are: a catalyst for FT synthesis, in which an active metal is supported on the surface of a carrier, the carrier contains silicon or aluminum, the active metal contains at least one selected from cobalt, ruthenium, and iron, and the metal density per specific surface area of the carrier is within a specific range; a method for producing said catalyst; and a hydrocarbon production apparatus and a hydrocarbon production method using the catalyst.　According to the present invention, it is possible to: improve the CO conversion rate in an FT synthesis reaction and improve the selectivity of the number of carbon atoms in an obtained hydrocarbon; and more easily generate a hydrocarbon having a specific number of carbon atoms.

The method is for producing para-xylene using, as a main raw material, a mixed gas of carbon dioxide or carbon monoxide or both thereof and hydrogen. The method including: a reaction step of bringing a raw material mixed gas including the mixed gas into contact with a reaction catalyst under high temperature and high pressure to cause a reaction, to thereby obtain a product gas mixture containing para-xylene; a separation step of cooling the product gas mixture obtained in the reaction step to condense a high boiling point component, to thereby separate the product gas mixture into a water phase containing a water-soluble component, an oil phase containing a xylene mixture, and a gas phase containing an unreacted gas; and a circulation step of mixing at least part of the gas phase having been separated in the separation step into the raw material mixed gas.

The invention discloses a short-Fe-C-bond Fe-based catalyst for catalyzing CO2 hydrogenation, a preparation method of the short-Fe-C-bond Fe-based catalyst and application of the short-Fe-C-bond Fe-based catalyst in preparation of C2 < + > high-added-value products, and belongs to the technical field of CO2 capture, utilization and storage. The catalyst is a carbon quantum dot doped Fe-based catalyst, and is prepared by the following steps: dissolving carbon quantum dots CQDs in an ethanol aqueous solution to obtain a CQDs dispersion liquid; and then adding cubic Fe2O3 nanoparticles, stirring for reaction, and drying to obtain the Fe-based catalyst with the short Fe-C bond. The short Fe-C bond Fe-based catalyst is simple to prepare and low in cost, can realize high-selectivity synthesis of C2 + products through one-step catalytic hydrogenation of CO2, and effectively reduces the selectivity of main C1 by-products CO and CH4. The invention develops a new regulation and control strategy for the electronic structure of the Fe-based catalyst for the CO2 hydrogenation catalytic reaction, provides a new thought for reasonably designing the catalyst with a directional synthesis function, and has a good application prospect in the field of CO2 capture, utilization and storage.

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 relates to the technical field of catalysts, in particular to a nano-catalyst for preparing methane through hydrogenation of carbon dioxide, the nano-catalyst is prepared from a eutectic solvent as a carrier precursor through a coprecipitation method, the nano-catalyst comprises a carrier, and NiO is loaded on the carrier; on the basis of the total mass of the nano-catalyst, the content of NiO is 5-20 wt%, and the content of the carrier is 80-95 wt%; the average particle size of the nano-catalyst is 5-10 nm; the carrier is selected from one or more of CeO2, ZrO2, MgO and Al2O3. According to the nano-catalyst, the dispersity and stability of NiO particles are effectively enhanced by using the eutectic solvent as a carrier precursor and a solvent, high-density Ni-OV interface sites are constructed in situ by using an alkali treatment method, the adsorption and activation of the catalyst on H2 and CO2 are promoted, the higher CO2 conversion rate is shown, and the catalyst has a good application prospect. The catalyst for efficiently obtaining a single product CH4 at a low temperature and with high selectivity has a higher application value.

The invention relates to the technical field of low-carbon olefin preparation, and discloses a method for preparing propylene and butylene through direct hydrogenation conversion of carbon dioxide, which comprises the following steps: (1) preparing a mesoporous SAPO-14 molecular sieve by adopting a gel aluminum-rich crystallization method; the molar ratio of SiO2 to Al2O3 to P2O5 in the raw materials of the gel aluminum-rich crystallization method is (0.02 to 0.2): (1.1 to 1.8): 1; (2) mixing the mesoporous SAPO-14 molecular sieve with a metal oxide to obtain a catalyst; and (3) taking a mixed gas of carbon dioxide and hydrogen as a raw material, and contacting with a catalyst for catalytic reaction to prepare propylene and butylene. The metal oxide and the mesoporous SAPO-14 molecular sieve are compounded and coupled to obtain the catalyst, the catalyst has high specific surface area and more active sites, catalytic reaction is facilitated, and higher propylene and butylene selectivity and catalytic stability can be obtained.

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 belongs to the technical field of catalysts, and particularly relates to a Fe-based catalyst, a preparation method thereof and application of the Fe-based catalyst to preparation of low-carbon olefin through CO2 hydrogenation. The Fe-based catalyst comprises a carrier, transition metal elements and alkali metal elements, wherein the transition metal elements and the alkali metal elements are loaded on the carrier; the carrier is formed by pyrolyzing a carbamide compound; the carbon atom number of the carbamide compound is less than or equal to 10; the transition metal element comprises Fe. Compared with the prior art, the alkali metal element is introduced into the catalyst, so that the CO2 adsorption capacity of the Fe-based catalyst can be enhanced, and the CO2 conversion rate is increased; in addition, the carbonization efficiency of the Fe-based catalyst can be effectively promoted, and the formation of an iron carbide active phase is promoted; moreover, the Fe-based catalyst shows good catalytic activity when being used in a reaction for preparing low-carbon olefin through CO2 hydrogenation, has an industrial application prospect, and also has relatively high low-carbon olefin selectivity.

The invention relates to the technical field of methane preparation, and discloses a methane preparation system based on carbon dioxide capture coupling electrolytic hydrogen production. According to the system, a trapping module is used for separating and purifying carbon dioxide from industrial waste gas through a pressure swing adsorption technology; the electrolysis module utilizes a proton exchange membrane electrolytic bath to decompose deionized water to generate high-purity hydrogen; the proportioning module is used for accurately mixing carbon dioxide and hydrogen according to the stoichiometric ratio of 1: 4 to form reaction raw materials; the catalysis module performs a Sabatier reaction under the action of a nickel-based catalyst to convert carbon dioxide and hydrogen into methane; the condensation module separates water vapor through cooling condensation to obtain a purified methane product. The technical problems of low system integration level and unstable conversion efficiency caused by lack of accurate control algorithms in the processes of carbon dioxide capture, electrolytic hydrogen production, gas proportioning, catalytic methanation and product separation in the prior art are solved.

A catalyst suitable for use in carbon oxide conversion reactions is described, said catalyst in the form of a shaped unit formed from an oxidic catalyst powder, said catalyst comprising 30-70% by weight of copper oxide, combined with zinc oxide, alumina and silica, having a Si:Al atomic ratio in the range 0.005 to 0.15:1, and having a BET surface area ≥105 m2 / g and a copper surface area >37 m2 / g catalyst. The catalyst is prepared by a co-precipitation method using an alumina sol.

The invention relates to an ultrathin Ru / Co3O4 catalyst, Co3O4 serving as a carrier is of an ultrathin two-dimensional nanosheet structure, and Ru nanoparticles are uniformly loaded on the surface of the Co3O4. The preparation method comprises the following steps: dispersing Co3O4 in a mixture of deionized water and methanol to obtain a suspension; and adding ruthenium trichloride into the suspension, and irradiating the mixture with a xenon lamp to finally obtain the ultrathin Ru / Co3O4 catalyst. The invention relates to an ultrathin Ru / Co3O4 catalyst applied to photo-thermal CO2 hydrogenation. The method has the advantages that Co3O4 is of an ultrathin two-dimensional nanosheet structure, Ru is evenly loaded on the surface of Co3O4, Ru / Co3O4 has the high specific surface area, rich active sites are provided, the photo-thermal catalysis CO2 hydrogenation activity is remarkably improved, the problem that an existing catalyst is low in activity is solved, parameters such as the heating rate, the roasting temperature and time are accurately controlled, and Ru doping is combined, so that the catalytic activity of CO2 is greatly improved. Active component loss and structure collapse are effectively avoided, and the stability is enhanced.

An electrolysis device includes: an electrolysis cell; a cathode supply flow path; an anode supply flow path; a cathode discharge flow path; an anode discharge flow path; a cathode flow rate regulator to adjust a flow rate A of a cathode supply fluid; an anode flow rate regulator to adjust a flow rate B of a anode supply fluid; a first flowmeter to measure a flow rate C of a cathode discharge fluid; a second flowmeter to measure a flow rate D of a anode discharge fluid; and a control device to estimate a Faraday efficiency according to a relational expression for approximating the Faraday efficiency to a function including the C and D, and control the cathode flow rate regulator according to the estimated Faraday efficiency to control the A.

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.

This invention discloses an S-type heterojunction photocatalyst composed of sulfur-defect-containing indium zinc sulfide and tungsten oxide, its preparation method, and its application. Specifically, this invention involves preparing WO3 nanosheets via a hydrothermal method, then loading them onto the surface of Zn3In2S6 using a solvothermal method, followed by introducing sulfur defects through phototreatment to obtain the S-type heterojunction photocatalyst WO3 / V. S -Zn3In2S6. The S-type heterojunction photocatalyst WO3 / V obtained in this invention. S -Zn3In2S6 exhibits excellent activity, enhanced CH4 selectivity, and good stability in the photocatalytic CO2 reduction reaction. Its preparation method is simple and easy, and it has good application prospects in the photocatalytic CO2 reduction reaction.