3528results about "Hydrogen production" patented technology

The invention relates to the technical field of hydrogen preparation, and provides a hydrogen storage device based on a solid hydrogen storage material and a hydrogen production method thereof.The device comprises a fuel tank internally provided with a reaction cavity used for containing an aluminum hydride material and mixed powder; the heater is arranged on the outer side of the fuel tank; the first end of the water recycling assembly is communicated with the reaction cavity, and the second end of the water recycling assembly is communicated with the fuel cell system so as to recycle water generated by the fuel cell system to the reaction cavity; the first end of the hydrogen discharging assembly is communicated with the reaction cavity, and the second end is communicated with a fuel cell system. According to the hydrogen storage device provided by the invention, through the application of the high-specific-energy solid hydrogen storage material aluminum hydride which can be stored at normal pressure and release hydrogen at a relatively low temperature, the thermal decomposition process of the metal hydride in the fuel tank and the coupling reaction process of the metal hydride and water are optimized, and the hydrogen is produced by utilizing the hydrolysis reaction of the aluminum hydride thermal decomposition reactant simple substance aluminum and the water; meanwhile, thermal decomposition of aluminum hydride is promoted through heat released by hydrolysis reaction, hydrogen release is coupled, and effective utilization of heat is achieved.

The present disclosure is directed to a processing solution composition comprising a metal salt, an acid, a solvent, and a non-metal reductant. The present disclosure is also directed to a method of impregnating a porous material by covering or coating the porous material with a processing solution comprising a metal salt, an acid, a solvent, and a non-metal reductant.

The invention discloses a novel photocatalyst for producing hydrogen from organic matter wastewater and a preparation method of the novel photocatalyst, and relates to the technical field of photocatalysis. The photocatalyst disclosed by the invention is combined with oxidation-reduction capability, and can effectively degrade and produce hydrogen under the irradiation of sunlight. Through combination of quaternized porous tungsten oxide and vanadate radicals, silver vanadate load growth is promoted, the sunlight utilization rate is increased, and the electron-hole recombination rate is reduced. Reduced graphene oxide is used for pretreatment, active groups are introduced, the reduced graphene oxide is compounded with tungsten oxide / silver vanadate, the binding force is enhanced through heat treatment, photo-induced electron-hole pair compounding is inhibited through the conductivity, and the visible light catalytic performance is improved. The adsorption effect of porous tungsten trioxide and reduced graphene oxide can accelerate the degradation of organic matters. By optimizing the proportion of silver vanadate, tungsten oxide and reduced graphene oxide, the visible light response and charge separation efficiency are enhanced, the degradation and hydrogen production performance is improved, and light corrosion is reduced.

An article for joule heating is described, including a three-dimensional substrate on and / or in which a pyrolyzate of a phenolic resin or polymer forms an electrically conductive carbon network. Such articles may be incorporated in structured materials applications, which may include support, sorbent, and or catalyst components. Also described are methods of fabricating such articles and structured materials, and apparatus comprising same, and methods of use of such articles and structured materials and apparatus for conducting material transformation processes requiring input of heat for their performance, such as CO2 adsorption, methane pyrolysis for hydrogen and carbon production, hydrogen-assisted conversion of CO2 to hydrocarbons, including catalytic conversion of CO2 to olefins, catalytic conversion of CO2 to propane (liquefied petroleum gas), and catalytic conversion of CO2 to renewable natural gas, reverse water gas shift reaction, steam ethane cracking, propane cracking, steam methane reforming, and dry methane reforming.

The present invention relates, in general, to systems and methods for generating hydrogen from ammonia on-board vehicles, where the produced hydrogen is used as fuel source for an internal combustion engine. The present invention utilizes an electric catalyst unit operating in series with a plate-type heat exchange catalyst unit. The electric catalyst unit is used to initiate an ammonia cracking process on-board during a cold start or low load operating condition of the internal combustion engine, where the ammonia cracking process occurs in the heat exchange catalyst unit once exhaust gas from the internal combustion engine has been heated to a threshold temperature suitable to perform the ammonia cracking process.

The invention discloses a rare earth oxide post-supported ruthenium-based ammonia decomposition catalyst, a preparation method and application thereof in hydrogen preparation through ammonia decomposition, and belongs to the technical field of hydrogen production. The ammonia decomposition catalyst takes an oxide or a carbon material as a carrier, firstly, ruthenium metal is loaded to form an active center, then, rare earth oxide is introduced in a post-loading mode, the structure and electronic characteristics of a metal-carrier interface are regulated and controlled, and finally, the ammonia decomposition catalyst with high dispersity and stability is obtained through reduction treatment. The low-temperature ammonia decomposition performance and the operation stability are obviously improved. Under the conditions that the temperature is 400 DEG C and the air speed of ammonia gas is 18000 mL.gcat <-1 >. H <-1 >, the ammonia conversion rate of the catalyst is close to the thermodynamic limit, and the catalyst has good anti-sintering and anti-poisoning capabilities. The catalyst is simple and convenient in preparation process, can be produced on a large scale, is suitable for various scenes of hydrogen production through ammonia decomposition, is particularly suitable for distributed and on-demand hydrogen production systems, and provides powerful technical support for efficient utilization and green conversion of hydrogen energy.

The invention provides novel liquid-liquid phase separation microparticles (LLPS MPs) as well as a preparation method and application thereof. The liquid-liquid separation (LLPS) system is micron liquid drops formed by driving under the electrostatic attraction effect of positively charged polyelectrolyte and negatively charged inorganic salt or organic salt in an aqueous solution. Polyoxometallate (POM) is used to stabilize it by electrostatic attraction and precipitate LLPS MPs having a ridge structure. According to the preparation method, [{(B-alpha-PW9O34) Co3 (OH) (H2O) 2 (O3PC (O) (C3H6NH3) PO3)} 2Co] 14-(Co7-POM) with photocatalytic water oxidation activity is selected to deposit micron particles, so that the micron particles have enhanced photocatalytic water oxidation activity, and meanwhile, the micron particles can be recycled through simple and feasible solid-liquid separation.

The invention belongs to the technical field of hydrogen production, and particularly relates to an electric heating catalyst and an electric heating catalytic ammonia decomposition hydrogen production system. The electrothermal catalyst comprises a catalyst component and a foam alloy electrode, wherein the catalyst component comprises an active metal, a carrier metal oxide and an auxiliary metal oxide; the interior of the foam alloy electrode is of a porous network structure, the catalyst components are uniformly distributed on the outer surface of the foam alloy electrode and the inner wall of the porous network structure, and the thickness of the catalyst components distributed on the outer surface of the foam alloy electrode and the thickness of the inner wall of the porous network structure are both 5-10 microns. The foam alloy electrode is used as a heating unit and a carrier for catalyst growth, catalyst forming is not needed, good heat transfer and mass transfer efficiency is achieved, meanwhile, the electro-thermal catalytic bed design of multiple sections of bed layers is combined, temperature subsection control of the multiple sections of bed layers is achieved, the optimal reaction conditions can be kept at different reaction stages, and the reaction efficiency is improved. Therefore, the reaction efficiency is obviously improved.

The utility model discloses an agricultural irrigation device which comprises a water tank, a water inlet pipe connected to the right end of the water tank, an irrigation pipe connected to the left end of the water tank, a through hole formed in the upper end of the water tank, a nut fixed to the upper end of the water tank and located on the outer side of the through hole, a rain cover arranged at the upper end of the water tank and located on the outer side of the nut, and a sleeve fixed to the upper end of the rain cover and integrated with the rain cover. A hand wheel is fixed to the upper end of the sleeve, a connecting column is installed in the sleeve, and the lower portion of the connecting column is in threaded connection with a nut. According to the agricultural irrigation device, after a hydrogen rod is installed on the lower portion of a connecting column, the hydrogen rod can penetrate through a nut and a penetrating hole, the hydrogen rod is moved into a water tank, then the lower portion of the connecting column is screwed into the nut, a rainproof cover moves downwards to cover the nut at the moment, and rainwater and soil can be prevented from entering the position between the nut and the connecting column through the rainproof cover; in addition, an observation window is arranged, the surface state of the hydrogen rod can be observed, and therefore a user can conveniently replace the hydrogen rod in time.

The invention relates to a heterojunction composite material and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the heterojunction composite material comprises the following steps: dispersing nano cadmium sulfide in water to obtain a nano cadmium sulfide dispersion liquid, then adding a triazinyl covalent organic framework, fully reacting at 75-85 DEG C, centrifuging, precipitating, washing and drying to obtain the heterojunction composite material. The narrow-band-gap semiconductor cadmium sulfide and the wide-band-gap semiconductor triazinyl covalent organic framework are compounded to form the heterojunction structure composite material photocatalyst, and the narrow-band-gap semiconductor cadmium sulfide and the wide-band-gap semiconductor triazinyl covalent organic framework interact with each other, so that the response range of sunlight is widened, separation and transfer of photo-induced electrons and holes are promoted, and the photoelectric conversion efficiency is improved. Therefore, the photocatalytic oxidation-reduction capacity of the catalyst is improved, and the photocatalytic performance of the catalyst is finally improved. The heterojunction composite material can be applied to the field of cleaning and environmental protection as a photocatalyst, and has excellent hydrogen production efficiency.

The invention belongs to the technical field of catalysis, and particularly relates to preparation of a high-activity Cu / ZnO / SiO2 catalyst and a reverse water gas shift reaction. Aiming at the problems of low reaction activity of low-temperature RWGS, low selectivity of a target product CO and the like in the existing Cu / ZnO-based catalyst, the invention prepares a novel Cu / ZnO / SiO2 catalyst which is used for promoting the reaction activity of medium-low-temperature reverse water gas shift. According to the invention, the polyhydroxy high-molecular compound is adopted to replace a part of small-molecular solvent, the novel Cu / ZnO / SiO2 catalyst with a silicon source, copper and zinc highly dispersed in mesoporous SiO2 is obtained by utilizing the polyhydroxy characteristic and low degree of freedom of the polyhydroxy high-molecular compound, and when the novel Cu / ZnO / SiO2 catalyst is used for a medium-low temperature reverse water gas shift reaction, the reaction activity can be effectively improved to 58%, and the reaction time can be shortened to 30-50 minutes. Meanwhile, the selectivity of the target product CO is 99% or above. The method has the advantages of low catalyst cost, high reaction efficiency, simple process operation and the like, and has a good industrial application prospect.

The invention provides a multi-aperture two-dimensional covalent organic framework material based on carbon-carbon double bond connection as well as a preparation method and application of the multi-aperture two-dimensional covalent organic framework material. The preparation method comprises the following steps: (1) under a protective atmosphere, putting 6, 6 '-dimethyl-3, 3'-bipyridazine, a multi-aldehyde aromatic monomer and benzoic anhydride into an ampoule bottle, the multi-aldehyde aromatic monomer being selected from a tri-aldehyde aromatic monomer or a tetra-aldehyde aromatic monomer; and (2) quickly freezing the ampoule bottle in the step (1) in a 77K liquid nitrogen bath, carrying out unfreezing circulation degassing through three freezing pumps, carrying out heating reaction at 150-250 DEG C for 72-120 hours, cooling to room temperature, and carrying out post-treatment to obtain the multi-aperture two-dimensional covalent organic framework material based on carbon-carbon double bond connection. The two-dimensional COFs obtained by performing a Navenger condensation reaction on an active methyl monomer and a multi-aldehyde aromatic monomer has relatively high crystallinity, specific surface area and stability, uniform two-dimensional layered morphology and a relatively wide absorption spectrum range, and the topological structure of the COFs comprises a uniform pore diameter and three different pore diameters.

The invention relates to a composite nanodot loaded porous carbon nitride photocatalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: calcining a precursor formed by mixing melamine, cyanuric acid and trithiocyanuric acid to obtain porous carbon nitride, and loading cobalt oxide nanodots and nickel nanodots on the porous carbon nitride in two steps, the composite nanodot loaded porous carbon nitride photocatalyst with excellent visible light catalytic hydrogen production performance is obtained; when the composite nanodot loaded porous carbon nitride photocatalyst obtained by the method is used for photocatalytic hydrogen production, an activity test result shows that the activity of the photocatalyst prepared by the method is improved by 222.5 times compared with that before modification; the preparation method disclosed by the invention has the advantages of high reaction efficiency and good performance of the obtained photocatalyst, and has a wide application prospect.

The invention belongs to the technical field of metallurgical industry gas resource utilization, and particularly relates to a method and system for preparing synthesis gas from blast furnace gas. The method comprises the steps that a CO2 adsorbent is heated to the first temperature to conduct CO2 adsorption on blast furnace gas, the adsorbent after CO2 adsorption is obtained, the CO2 adsorbent is CaO, and the first temperature is smaller than or equal to 650 DEG C; the adsorbent after CO2 adsorption is heated to a second temperature for CO2 desorption, obtained CO2 and H2 are catalyzed by a copper-based catalyst under the second temperature condition to be subjected to a reverse water-gas shift reaction, synthesis gas is obtained, and the second temperature is higher than or equal to 700 DEG C. The method provided by the invention realizes effective separation and conversion of carbon dioxide in blast furnace gas to obtain a synthesis gas product, thereby realizing closed cycle of carbon resources, remarkably improving the economical efficiency of blast furnace gas, and realizing efficient utilization of energy.

The invention provides a hydrogen storage catalyst, a preparation method thereof and application of the hydrogen storage catalyst in a hydrogen fuel cell, and belongs to the technical field of new energy. The preparation method of the hydrogen storage catalyst provided by the invention comprises the following steps: electroplating the surface of a nickel substrate to prepare a cobalt-phosphorus coating to obtain the hydrogen storage catalyst, the electroplating voltage ranges from 8.5 V to 9.5 V, the electroplating time ranges from 4.5 min to 5.5 min, and the electroplating temperature ranges from 25 DEG C to 35 DEG C. According to the method, the electroplating voltage, time and temperature are optimized, so that the quality of the cobalt-phosphorus coating can be improved, the cobalt-phosphorus coating is granular, and extending branches are formed at the protruding positions, so that the seawater corrosion resistance of the hydrogen storage catalyst is improved.

The invention discloses a La2O3-ZnO-NiO / ZrO2 oxygen carrier as well as a preparation method and application thereof, and belongs to the technical field of ammonia decomposition. According to the technical scheme, the method comprises the following steps: 1) synthesis of a ZrO2 carrier: adding NH3.H2O into a zirconyl nitrate solution to induce precipitation; 2) preparation of La2O3 / ZrO2: adding lanthanum nitrate hexahydrate and urea to obtain a precipitate, drying the precipitate, and finally calcining the precipitate; 3) preparation of La2O3-ZnO / ZrO2: adding zinc nitrate hexahydrate and urea, standing to obtain a precipitate, drying and calcining; and 4) preparation of La2O3-ZnO-NiO / ZrO2: adding NH3.H2O, then adding nickel acetate and thiourea, reacting, drying, and calcining twice to obtain the target product. Lattice oxygen in the oxygen carrier is used for catalytic oxidation of ammonia decomposition, the oxygen carrier can be recycled for multiple times, and the method is suitable for industrial application in the future.

The invention discloses a monatomic catalyst capable of retaining surface defects of a catalyst as well as a preparation method and application of the monatomic catalyst, and belongs to the field of catalysis. The monatomic catalyst comprises an active metal component, a doping element and a carrier, the carrier is a semiconductor material rich in surface defects. The preparation method adopts a light-induced migration-conversion strategy. The monatomic catalyst which is obtained by the preparation method and retains the surface defects of the semiconductor material is applied to the fields of photocatalysis, thermocatalysis and electrocatalysis, and shows excellent performance.

The invention relates to the technical field of smelting, in particular to a preparation method of direct reduction iron. The preparation method of the direct reduced iron comprises the following steps: by taking high-temperature and high-pressure hydrogen-rich synthesis gas generated by gasifying a biomass raw material as reducing gas, reducing pellets containing medium-low-grade iron ores to obtain the direct reduced iron, the high-temperature and high-pressure hydrogen-rich synthesis gas comprises H2 and CO; when the molar fraction of H2 is 50% < = XH2lt; when the content is 65% and the molar fraction of CO is 30%-45%, the reduction reaction temperature is 900-950 DEG C; when the molar fraction of H2 is 65% < = XH2lt; when the molar fraction of CO is 90% and the molar fraction of CO is 5%-30%, the reduction reaction temperature is 850-900 DEG C; when the molar fraction XH2 of H2 is greater than or equal to 90%, the reduction reaction temperature is 800-850 DEG C; the method can realize direct reduction of hydrogen groups of medium-low-grade iron ores, and is low in energy consumption and less in carbon emission.

The invention provides a long-acting and low-cost Ru-based catalyst for hydrogen production through ammonia decomposition and a preparation method thereof.The preparation method comprises the steps that calcium salt or strontium salt and cerium nitrate hexahydrate are added into deionized water to be prepared into a mixed solution, the pH value of the mixed solution is adjusted, then a precipitate is obtained through closed heating treatment, carrier powder is prepared through roasting and grinding in sequence, and the Ru-based catalyst for hydrogen production through ammonia decomposition is obtained; and adding a proper amount of ruthenium salt, uniformly stirring to form a Ru-carrier dispersion liquid, and finally, sequentially roasting and grinding to obtain the Ru-based catalyst for hydrogen production by ammonia decomposition. The loading capacity of the catalyst is lower than that of conventional Ru, the catalyst can show good ammonia decomposition hydrogen production performance under the conditions that the 10% NH3 / Ar mass space velocity (GHSV) is 30000 ml / (gcat.h) and the low temperature is 450 DEG C, it is accidentally found that the catalyst can keep long-term stability for at least 100 hours or above, and meanwhile the simple synthesis method is suitable for industrial large-scale production.

Systems and methods for producing green hydrogen from a source material (e.g., biowaste) are contemplated. The source material is at least partially dehydrated to produce a dried intermediate and recovered water. The dried intermediate is pyrolyzed to produce syngas and a char. The recovered water is electrolyzed to produce oxygen and green hydrogen.

The disclosure relates to systems and methods for hydrogen storage in underground formations using foam. The methods include injecting a foam including hydrogen and a surfactant into the underground formation or injecting hydrogen and a surfactant into the underground formation and forming a foam in the underground formation.

The invention relates to the technical field of chemical catalysts, in particular to a cerium-based solid solution loaded iron-based oxygen vacancy enhanced low-temperature ammonia synthesis catalyst. The heterovalent ions are doped in CeO2 crystal lattices to introduce strain and defects, so that the oxygen vacancy formation energy and concentration are greatly improved. Experiments show that the oxygen vacancy concentration (delta) of the Ce0. 8Zr0. 2O2-delta carrier disclosed by the invention can reach 0.12, which is 3-5 times that of pure CeO2. Under the conditions of 250 DEG C and 5 MPa, the ammonia synthesis rate reaches 120 [mu] mol / g / h, which is more than 20 times that of a traditional molten iron catalyst; under the conditions of 350 DEG C and 10 MPa, the ammonia synthesis rate exceeds 1000 [mu] mol / g / h and is close to the level of a noble metal ruthenium-based catalyst. As the working temperature is reduced by 100-150 DEG C, the reaction heat consumption is reduced by more than 30%, and the overall energy consumption is reduced by 25-40%.

The invention relates to a MnWO4 / ZnIn2S4 heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. In the experiment process, MnWO4 is dissolved in a precursor solution of ZnIn2S4, the MnWO4 / ZnIn2S4 heterojunction composite materials with different molar ratios are obtained by changing the molar ratio of an Mn source, and the MnWO4 / ZnIn2S4 heterojunction composite materials can be applied to the field of hydrogen evolution through photocatalytic water decomposition. Compared with an existing photocatalyst, the MnWO4 / ZnIn2S4 heterojunction has the advantages that the controllability is good when the MnWO4 / ZnIn2S4 heterojunction serves as a catalyst, the separation efficiency of current carriers can be further improved, and it is obtained through experiments that the composite material has high hydrogen yield and good stability when being used for photocatalytic water splitting. The method is green and environment-friendly, simple, convenient to operate and low in material preparation cost, conforms to the green and environment-friendly concept advocated at present, and has a wide application market prospect.

The invention discloses a graphite diacetylene / copper oxide composite material cocatalyst and a co-production preparation process and application thereof. Graphite diyne has a two-dimensional layered structure and is composed of sp and sp hybridized carbon atoms, a periodically distributed structure is formed, and excellent electron transmission performance and pore structure are shown. An existing graphite diacetylene synthesis method is complex and high in cost, large-scale application of the graphite diacetylene in the industrial field is seriously restricted, the potential value of a copper catalyst cannot be fully exerted, and resource waste is caused. According to the invention, through a simple and efficient co-production process, co-production of graphite diyne and copper oxide nanoparticles is realized for the first time, and the graphite diyne / copper oxide composite material is successfully prepared. The novel composite material can be used as a cocatalyst to effectively improve photocatalytic hydrogen production, and the hydrogen production performance can be comparable with that of noble metal photocatalysts such as Pt. The problems of tedious steps, high energy consumption, low yield and the like in a traditional preparation method are solved, and the preparation method has important application value in the field of high-performance photocatalysis.

A system and method are provided in at least one embodiment to process water to produce gas that can be separated into at least two gas flows using a water treatment system having a disk-pack rotating in it to cause out gassing from the water. In a further embodiment, the method and system use the gas released from the water to produce substantially fresh water from the processed salt water.

The invention discloses a method for synthesizing a Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst by adopting a solvothermal method, and belongs to the technical field of catalysts. The preparation method comprises the following steps: preparing copper molybdenum sulfide by using cuprous oxide as a template, synthesizing copper molybdenum sulfide with high purity and good crystallinity by combining a solvothermal method, preparing manganese cadmium sulfide by using manganese acetate, cadmium acetate, sodium hydroxide and thioacetamide as raw materials, adding copper molybdenum sulfide before a hydrothermal reaction, successfully modifying the manganese cadmium sulfide by constructing a heterojunction, and preparing the copper molybdenum sulfide modified manganese cadmium sulfide. The Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst is synthesized, and the photocatalytic hydrogen production rate of the cadmium manganese sulfide is improved. Moreover, the hydrogen production rate of the Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst prepared by the invention can reach 8233 mu mol / (g.h), which is 2.08 times of the hydrogen production rate of pure cadmium manganese sulfide, and 1.24 times of the hydrogen production rate of cadmium manganese sulfide loaded with 1% platinum.

The invention relates to an external field intelligent regulation and control photocatalytic hydrogen production integrated device and system. The device comprises a Fresnel lens; the double-layer vacuum glass tube comprises an outer-layer glass tube, an inner-layer glass tube and a vacuum layer located between the outer-layer glass tube and the inner-layer glass tube, and the inner-layer glass tube is connected with an external water source and the separation module; the Helmholtz coil comprises two conductor coils, and the two conductor coils are symmetrically arranged at the two ends of the outer-layer glass tube in a sleeving mode and are communicated with an external power source; the photocatalyst is arranged in the inner-layer glass tube and is positioned at a strip-shaped light band of the sunlight focused by the Fresnel lens; the separation module comprises a hydrogen separation membrane and a gas outlet and is used for efficiently separating gas generated by reaction; the Fresnel lens is connected with the double-layer vacuum glass tube through the fixing support and located on the upper side of the double-layer vacuum glass tube. The Helmholtz coil is used for generating a magnetic field to improve the photo-generated charge separation efficiency in the photocatalytic reaction process, so that the hydrogen production efficiency is improved. The efficiency of photocatalytic reaction hydrogen production can be improved through precise regulation and control of an external field.

The invention provides a multistage coupling chemical looping hydrogen production device. The multistage coupling chemical looping hydrogen production device comprises a first-section reducer, a water vapor oxidation hydrogen production device, a second-section reducer, a methane converter and an air oxidizer, identical first oxygen carriers are arranged in the first-section reducer and the water vapor oxidation hydrogen production device, and identical second oxygen carriers are arranged in the second-section reducer, the methane converter and the air oxidizer; the methane converter is connected with the first-section reducer and is used for conveying synthesis gas after methane conversion to the first-section reducer; the second-section reducer is connected with the methane converter and is used for refluxing carbon dioxide or water vapor or both to the methane converter; the first-section reducer is connected with the second-section reducer and is used for conveying reduction tail gas containing carbon monoxide or hydrogen or the carbon monoxide and the hydrogen to the second-section reducer. Therefore, the invention provides the multistage coupling chemical looping hydrogen production device and method which can realize energy self-sustaining and do not need external energy input.

The invention discloses a COF (Covalent Organic Framework) photocatalyst based on accurate regulation and control of benzene ring nitrogen sites as well as a preparation method and application thereof, and belongs to the technical field of COF materials. According to the preparation method, toxic reagents are not needed, high repeatability of a COF structure is achieved by accurately controlling monomer substitution positions, photocatalytic activity and stability in an acid environment are remarkably improved by designing ortho-N-substituted, meta-N-substituted and para-N-substituted COF materials, especially the photocatalytic hydrogen peroxide production rate of ortho-N-substituted oN-COF reaches 3015 [mu] mol.g <-1 >. H <-1 >, and the photocatalytic activity and stability in the acid environment are remarkably improved. The activity is obviously higher than that in the prior art (1.8 mmol.g <-1 >. H <-1 >, namely 1800 mu mol.g <-1 >. H <-1 > reported by Zhang and the like), and the activity is kept 92% after five times of circulation. The process is green and environment-friendly, and is suitable for large-scale production.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a preparation method of a monatomic ruthenium-based catalyst and application of the monatomic ruthenium-based catalyst in hydrogen production through ammonia decomposition. According to the method, an atom capture method is adopted, ruthenium precursor powder and the oxide carrier are subjected to high-temperature treatment in the oxygen-containing atmosphere, Ru species volatilized in the high-temperature oxidizing atmosphere are captured through the oxide carrier, anchoring of Ru atoms is achieved, the stability of Ru on the surface of the carrier is effectively improved, and the atom utilization rate of precious metal is increased. The monatomic Ru-based catalyst prepared by the invention has high reaction activity in the reaction of catalyzing ammonia decomposition to produce hydrogen, the preparation method is simple, the stability is high, and the monatomic Ru-based catalyst has a wide application prospect in the field of ammonia decomposition to produce hydrogen.