Molecular sieve limited range ammonia cracking hydrogen production catalyst and preparation method thereof

Abstract

According to the molecular sieve limited range ammonia cracking hydrogen production catalyst and the preparation method thereof, active components, an alkali source, an organic ligand, a template agent, a silicon source and an aluminum source are utilized to rivet the active components in a molecular sieve, the sizes of cluster particles of the active components are regulated through roasting in a reducing atmosphere, interaction among the active components is increased, and the molecular sieve limited range ammonia cracking hydrogen production catalyst is prepared. Therefore, the catalytic reaction temperature of ammonia cracking hydrogen production is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production catalyst preparation, in particular to a molecular sieve confined ammonia cracking hydrogen production catalyst and a preparation method thereof. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, hydrogen as a clean and efficient energy carrier has attracted widespread attention. Hydrogen has high energy density, and its combustion product is water without pollution, etc., and has great application potential in fuel cells, chemical raw materials and many other fields. Traditional hydrogen production methods such as fossil fuel reforming have problems such as non-renewable raw materials, carbon emissions, etc.

[0003] Ammonia decomposition is considered as a promising way of hydrogen production. Ammonia is a hydrogen-rich substance with a hydrogen content of 17.65%. Ammonia decomposition reaction can efficiently produce hydrogen under suitable conditions. In addition, ammonia is easy to store and transport, and can be relatively easily constructed on the basis of existing infrastructure. Ammonia decomposition reaction usually needs to be carried out at a relatively high temperature, which consumes a lot of energy. The introduction of catalysts can significantly reduce the activation energy of the reaction, thereby achieving efficient ammonia decomposition reaction at a relatively low temperature.

[0004] However, existing ammonia cracking catalysts mostly rely on noble metals (such as Ru / Al2O3) and need to be operated at a high temperature of 450-600℃, and the carrier is prone to hydrogen embrittlement. The catalyst synthesized by traditional impregnation method is prone to metal particle agglomeration, resulting in decreased activity. Therefore, it is urgent to develop a new ammonia decomposition hydrogen production catalyst and a preparation method thereof. SUMMARY

[0005] In order to solve the above technical problems, the present application is proposed. The embodiments of the present application provide a molecular sieve confined ammonia cracking hydrogen production catalyst and a preparation method thereof.

[0006] According to one aspect of the present application, a molecular sieve confined ammonia cracking hydrogen production catalyst is provided, comprising: an active component, an alkali source, an organic ligand, a template agent, a silicon source and an aluminum source.

[0007] In an embodiment, the active component comprises a noble metal, a noble metal salt or a transition metal.

[0008] In an embodiment, the noble metal comprises ruthenium, and the transition metal comprises any one or a combination of more of the following metal materials: nickel, cobalt, iron, molybdenum.

[0009] In an embodiment, the alkali source comprises any one or a combination of more of sodium hydroxide or potassium hydroxide.

[0010] In an embodiment, the organic ligand comprises a combination of one or more of: ethylenediamine, triethylamine, 1,3-bis(imidazolyl)butane, 1,3-bis(imidazolylmethyl)benzene, 1,10-phenanthroline, 2,2'-bipyridine-4,4'-dicarboxylic acid.

[0011] In an embodiment, the silicon source comprises a combination of one or more of: water glass, silica sol, fumed silica, white carbon black, tetraethyl orthosilicate.

[0012] In an embodiment, the aluminum source comprises a combination of one or more of: molecular sieve, aluminum nitrate, aluminum sulfate, aluminum chloride, aluminum hydroxide, sodium metaaluminate, pseudoboehmite, aluminum isopropoxide.

[0013] In an embodiment, the template agent comprises at least one of: tetraethylammonium hydroxide, tetrapropylammonium hydroxide, N,N,N-trimethyl-1-adamantammonium hydroxide, N-N-N-trimethyladamantylammonium bromide, N-N-N-trimethyladamantylammonium iodide, benzyltrimethylammonium hydroxide, N,N-dimethyl-N-ethylcyclohexylammonium, triethylamine phosphate, 3,3,5-trimethylcyclohexyl, N,N,N-trimethylcyclohexylammonium.

[0014] According to another aspect of the present application, a preparation method of a molecular sieve confined ammonia cracking hydrogen production catalyst is provided, comprising: dissolving a soluble template agent in deionized water, adding an alkali source, stirring until completely dissolved, to obtain solution A; adding a soluble silicon source to solution A, and stirring after ultrasonic treatment for 1 hour; adding a soluble active component to a mixed solution of an organic ligand and water, stirring to dissolve, to obtain solution B; slowly adding solution B to solution A to obtain solution C; moving solution C to a reaction kettle, and reacting at a fixed temperature in an oven; filtering the reacted solution, and washing with an ethanol aqueous solution 3 times to obtain catalyst D; drying catalyst D in a drying box; calcining dried catalyst D in a reducing atmosphere at a fixed temperature to obtain the target catalyst.

[0015] In an embodiment, the calcining of the dried catalyst D in a reducing atmosphere at a fixed temperature to obtain the target catalyst comprises: calcining the dried catalyst D in a reducing atmosphere for 1-5 hours to obtain the target catalyst; wherein the reducing atmosphere comprises one of hydrogen or ammonia, and the concentration of the reducing atmosphere is 3-10%.

[0016] The molecular sieve confined ammonia cracking hydrogen production catalyst and the preparation method thereof provided by the present application use an active component, an alkali source, an organic ligand, a template agent, a silicon source, and an aluminum source to rivet the active component inside the molecular sieve, control the cluster particle size of the active component through reduction atmosphere calcination, increase the interaction between the active components, and thus effectively reduce the ammonia cracking hydrogen production catalyst reaction temperature. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description thereof taken in conjunction with the accompanying drawings, in which like reference characters designate like elements in the several views. The accompanying drawings are intended to provide a further understanding of the embodiments of the present application and are incorporated into and constitute a part of this specification, illustrate embodiments of the present application and serve to explain the present application, and are not intended to limit the present application. In the drawings, like reference numerals refer to like elements throughout.

[0018] Figure 1 is a structural schematic diagram of a molecular sieve confined ammonia cracking hydrogen production catalyst provided by an exemplary embodiment of the present application.

[0019] Figure 2 is a flow schematic diagram of a preparation method of a molecular sieve confined ammonia cracking hydrogen production catalyst provided by an exemplary embodiment of the present application.

[0020] Figure 3 is an ammonia conversion rate curve schematic diagram of a molecular sieve confined ammonia cracking hydrogen production catalyst provided by an exemplary embodiment of the present application.

[0021] Figure 4 is a structural diagram of an electronic device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0022] Hereinafter, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the described exemplary embodiments.

[0023] Figure 1 is a structural schematic diagram of a molecular sieve confined ammonia cracking hydrogen production catalyst provided by an exemplary embodiment of the present application. As shown in Figure 1 the molecular sieve confined ammonia cracking hydrogen production catalyst includes an active component, an alkali source, an organic ligand, a template agent, a silicon source and an aluminum source.

[0024] A molecular sieve confined ammonia cracking hydrogen production catalyst provided by the present application uses an active component, an alkali source, an organic ligand, a template agent, a silicon source and an aluminum source to rivet the active component inside the molecular sieve, adjusts the active component cluster particle size through reduction atmosphere calcination, and increases the interaction between the active components, thereby effectively reducing the ammonia cracking hydrogen production catalytic reaction temperature.

[0025] In an embodiment, the active component can include a noble metal, a noble metal salt or a transition metal.

[0026] In an embodiment, the noble metal can include ruthenium, and the transition metal can include any one or a combination of more than one of the following metal materials: nickel, cobalt, iron, molybdenum.

[0027] Ruthenium is a transition metal in the fifth period of the periodic table, belonging to platinum group elements, with a relative density of 12.45 g / cm 3 (20℃), a melting point of 2334℃, a boiling point of 4150℃, and a resistivity of 7.6x10 -8 Ω·m (20℃), with chemical inertness, stability in air, halogen, water and acid, and can react with molten alkali. Ruthenium can increase the recording capacity of hard disk, has excellent catalytic activity, good electrical conductivity and high temperature resistance, corrosion resistance and other characteristics.

[0028] Nickel is a transition metal in the fourth period of the eighth group, which is a hard and ductile transition metal with silver-white luster and ferromagnetic properties. Nickel has good thermal and electrical conductivity, strong plasticity, high temperature resistance, corrosion resistance, chemical stability, and strong oxidation resistance.

[0029] Cobalt is a metal element in the periodic table, with a hardness and brittleness, a melting point of about 1500℃, a boiling point of about 3100℃, a relative density of 8.9 g / cm 3 , a Mohs hardness of 5-5.5, and a high strength at high temperature, low thermal and electrical conductivity, and strong ferromagnetism.

[0030] Iron is a metal element in the fourth period of the eighth group of the periodic table. Pure iron is a silver-white lustrous metal with a density of 7.86 g / cm 3 and a melting point of 1539℃. In addition to electrical conductivity, thermal conductivity and ductility, iron can also be attracted by magnets and has ferromagnetic properties.

[0031] Molybdenum is a dark gray or black powder or silver-white block with metallic luster. It does not exist naturally in pure metal form, but mainly exists in the form of oxide or sulfide. Naturally occurring molybdenum compounds include molybdenite, tungsten lead ore, iron molybdenum ore and magnesium manganese ore minerals. Molybdenum has a very high melting point and is widely used in the manufacture of steel alloys in industry. The biggest feature of molybdenum is that it can form complex polyatomic and heteropoly acid anions.

[0032] In one embodiment, the alkali source includes any one or a combination of sodium hydroxide or potassium hydroxide.

[0033] Sodium hydroxide, also known as caustic soda, caustic soda, caustic soda, caustic soda, is an inorganic compound with a relative molecular mass of 39.9970. Sodium hydroxide has strong alkaline and strong corrosive properties, and can be used as acid neutralizer, complex masking agent, precipitating agent, precipitating masking agent, color developing agent, saponifying agent, peeling agent, detergent, etc.

[0034] Potassium hydroxide, also known as "caustic potash", is a common strong alkaline inorganic compound, often white flaky, very easy to dissolve in water, ethanol, exothermic when dissolved, very easy to absorb moisture and carbon dioxide in the air, can be used as an analytical reagent, used in soap making, papermaking, textile, printing and dyeing, pharmaceutical, electroplating and other chemical industry and organic synthesis.

[0035] In an embodiment, the organic ligand includes a combination of any one or more of: ethylenediamine, triethylamine, 1,3-di(imidazolyl)butane, 1,3-di(imidazolylmethyl)benzene, 1,10-phenanthroline, 2,2'-bipyridine-4,4'-dicarboxylic acid.

[0036] Ethylenediamine, abbreviated as EDA, has the chemical formula C2H8N2, is a typical aliphatic diamine, is colorless or slightly yellowish oil or water-like transparent liquid, has an ammonia-like odor, and is hygroscopic. Its molecular weight is 60.10, the melting point is 8.5℃, the ignition point is 385℃, it is an alkaline substance, easily soluble in water, ethanol, slightly soluble in diethyl ether, can form an azeotropic mixture with water, n-butanol, toluene, and ethylenediamine can be used to manufacture fuel, rubber vulcanization accelerator, medicine, etc.

[0037] Triethylamine is an organic compound with the chemical formula C6H 15 N, is a colorless oily liquid, slightly soluble in water, the aqueous solution is alkaline, soluble in ethanol, diethyl ether, acetone and most organic solvents, mainly used as a solvent, polymerization inhibitor, preservative, also used in the synthesis of dyes, etc.

[0038] 1,3-di(imidazolyl)butane is a nitrogen-containing heterocyclic organic ligand, its structure is that two carbon atoms of butane chain are connected with one imidazole group respectively, and it shows good catalytic activity under ultraviolet light irradiation.

[0039] 1,3-di(imidazolylmethyl)benzene is an organic compound, its chemical structure is formed by connecting two imidazole groups through methyl at 1,3 position of benzene ring, and it coordinates with metal ions through imidazole groups in its structure, and plays a catalytic role in specific chemical reactions.

[0040] 1,10-phenanthroline (anhydrous) is a chemical substance with the chemical formula C 12 H8N2, is a metal chelating agent that can prevent streptozotocin-induced chromosomal aberration.

[0041] 2,2'-bipyridine-4,4'-dicarboxylic acid is a chemical substance with the molecular formula C 12 H8N2O4, is a white to light yellow powder, insoluble in water, enhances the catalytic effect of CO2 cycloaddition reaction under normal pressure.

[0042] In an embodiment, the silicon source can include any one or a combination of the following: water glass, silica sol, fumed silica, white carbon black, tetraethyl orthosilicate.

[0043] Water glass (sodium silicate) is a mineral binder, which is a soluble inorganic silicate with a wide range of uses.

[0044] Silica sol is a colloidal solution, odorless, non-toxic, silica sol is a nanoscale dispersion of silica particles in water or solvent.

[0045] Fumed silica is a nanoscale amorphous silica prepared by hydrolysis of halosilane at high temperature, due to its unique high surface activity, it can adsorb gas, liquid or impurities, used as catalyst carrier, defoamer, pollutant removal.

[0046] White carbon black is a white powder X-ray amorphous silica and silicate product, mainly refers to the precipitated silica, fumed silica and ultra-fine silica gel, also includes powder synthetic aluminum silicate and calcium silicate, etc. White carbon black is a porous material, can be dissolved in caustic soda and hydrofluoric acid, insoluble in water, solvent and acid (hydrofluoric acid except) has high temperature resistance, non-combustible, odorless, no smell, good electrical insulation.

[0047] Tetraethyl orthosilicate is a colorless transparent liquid, very easy to hydrolysis to generate silica and ethanol, with its high purity, good film forming property and reactivity, it plays a "silicon source" and "crosslinking agent" in many industrial fields.

[0048] In an embodiment, the aluminum source can include any one or a combination of the following: molecular sieve, aluminum nitrate, aluminum sulfate, aluminum chloride, aluminum hydroxide, sodium metaaluminate, pseudo-boehmite, aluminum isopropyl alcohol.

[0049] Molecular sieve is a kind of artificial synthesis of hydrated silicate or natural zeolite with the function of screening molecules, which has many uniform pore channels and orderly arranged holes in structure, different pore size molecular sieve separates different size and shape molecules. According to the different molecular ratio of SiO2 and Al2O3, different pore size molecular sieve is obtained: 3A (potassium A type), 4A (sodium A type), 5A (calcium A type), 10Z (calcium Z type), 13Z (sodium Z type), Y (sodium Y type), sodium mordenite type, etc. It has high adsorption capacity, strong selectivity and high temperature resistance.

[0050] Aluminum nitrate is an inorganic compound, chemical formula is Al (NO3) 3, mainly used for preparing catalyst, mordant, leather tanning agent, corrosion inhibitor, other aluminum salt, also can be used as salt agent in nuclear industry.

[0051] Aluminum sulfate is a common inorganic salt, chemical formula Al2(SO4)3, often in the form of crystalline hydrate, appearance is usually white, tasteless, shiny crystals or powder, easy to absorb moisture, density of 2.71g / cm³, melting point of 770℃, soluble in water, slightly soluble in alcohol.

[0052] Aluminum chloride is an inorganic salt compound, chemical formula AlCl3, aluminum chloride is colorless or white hexagonal crystal at room temperature, industrial product is light yellow. Aluminum chloride is easily soluble in water and strongly hydrolyzed, the solution is acidic, also soluble in ethanol, diethyl ether, chloroform, carbon tetrachloride, slightly soluble in benzene, while releasing a large amount of heat.

[0053] Aluminum hydroxide is an inorganic substance, chemical formula Al(OH)3, is the hydroxide of aluminum, aluminum hydroxide can react with acid to generate salt and water and can react with strong base to generate salt and water, so it is an amphoteric hydroxide.

[0054] Sodium metaaluminate is an inorganic salt compound, chemical formula NaAlO2, appearance is white powder solid, melting point is 1650℃, density is greater than 1.5g / cm³, easy to deliquesce, can absorb moisture to generate aluminum hydroxide, easily soluble in water, aqueous solution is alkaline, insoluble in ethanol.

[0055] Pseudo-boehmite is a transition state aluminum oxide with high specific surface area and large pore volume. The wet product is white colloid, the dry product is white powder, has thixotropic gel structure and uniform pore size distribution, and is widely used as a catalyst carrier for heavy oil hydrogenation, methanation, etc.

[0056] Aluminum isopropylate is white crystal or block or powder, has strong hygroscopicity, decomposes to generate aluminum hydroxide when meeting water, is tetramer at room temperature. Aluminum metal and isopropyl alcohol act in the presence of catalyst, or aluminum chloride and sodium isopropylate act to obtain aluminum isopropylate, which is used as a reducing agent, a strong dehydrating agent, and is used for reducing base compounds and organic synthesis.

[0057] In an embodiment, the template agent can include at least one of tetraethylammonium hydroxide, tetrapropylammonium hydroxide, N,N,N-trimethyl-1-adamantammonium hydroxide, N-N-N-trimethyladamantylammonium bromide, N-N-N-trimethyladamantylammonium iodide, benzyltrimethylammonium hydroxide, N,N-dimethyl-N-ethylcyclohexylammonium, triethylamine phosphate, 3,3,5-trimethylcyclohexyl, N,N,N-trimethylcyclohexylammonium.

[0058] Tetraethylammonium hydroxide is a quaternary ammonium base organic compound, chemical formula C8H 21NO, colorless transparent liquid at room temperature, density of 1.023 g / cm³, melting point of -98 ℃, boiling point of 110 ℃, flash point of 11 ℃, its basicity is stronger than sodium hydroxide and potassium hydroxide, has strong corrosive, easy to absorb carbon dioxide, the compound is widely used in polarographic analysis reagent, molecular sieve template, organic silicon product polymerization catalyst, electronic industry cleaning agent and organic synthesis phase transfer catalyst and other fields.

[0059] Tetrapropylammonium hydroxide is a quaternary ammonium base, which is usually in the form of 20%-40% aqueous solution or methanol solution at room temperature, and can control the crystal size, acid strength and pore order as a template agent (SDA).

[0060] N,N,N-trimethyl-1-adamantane ammonium hydroxide is a rigid adamantane skeleton quaternary ammonium base, which is usually in the form of 20-25% aqueous solution (colorless-yellow, strong basicity) at room temperature, and can accurately "card" in the CHA cage in the hydrothermal synthesis of small pore molecular sieves, guide the regular eight-membered ring channel, control the crystal size and morphology, and determine the acid strength distribution of the final catalyst.

[0061] N-trimethyladamantyl ammonium bromide can accurately embed the CHA cage in the hydrothermal synthesis of SSZ-13 (CHA topology), SAPO-34 and other small pore molecular sieves, induce regular eight-membered ring channels, control crystal size and morphology, determine subsequent Cu²⁺ / Fe²⁺ ion exchange sites, and prepare NH3-SCR denitration catalyst.

[0062] N-N-N-trimethyladamantyl ammonium iodide is a typical representative of "adamantane skeleton + trimethyl quaternary ammonium salt" combination, which can accurately guide the eight-membered ring channel in the hydrothermal synthesis of SSZ-13 (CHA topology), SAPO-34 and other small pore molecular sieves, control the crystal size and morphology, determine the subsequent Cu²⁺ / Fe²⁺ ion exchange sites, and prepare NH3-SCR denitration catalyst for diesel vehicle exhaust.

[0063] Benzyltrimethylammonium hydroxide is usually in the form of 25%-40% water or methanol solution, and is a functional quaternary ammonium base with strong basicity and phase transfer catalytic activity.

[0064] N,N-dimethyl-N-ethylcyclohexylammonium, also known as cyclohexyl dimethyl ethyl ammonium, is in the form of cyclohexyl dimethyl ethyl ammonium bromide, which is mainly used as a structure directing agent in the synthesis of molecular sieves and other materials to control the pore structure and morphology of the materials.

[0065] Triethylamine phosphate is a rigid cyclohexyl quaternary ammonium salt, and its most important identity is as a special organic structure directing agent for CHA type molecular sieves (such as SSZ-13), and it also plays a high-end assistant role in phase transfer catalysis, medicine and industrial sterilization.

[0066] 3,3,5-trimethylcyclohexyl refers to a "phosphoric acid-triethylamine" system, which is the preferred neutralizing agent for treating triethylamine waste gas in industry, and has the functions of plasticizing, flame-retardant and catalysis.

[0067] N,N,N-trimethylcyclohexylammonium is a rigid cyclohexane skeleton quaternary ammonium salt / base, which is the primary identity of CHA type zeolite (such as SSZ-13, SAPO-34) efficient organic structure directing agent (OSDA), and also acts as a phase transfer catalyst or pH adjusting base in catalysis, separation and fine chemical industry.

[0068] Figure 2 is the flowchart of the preparation method of the molecular sieve confined ammonia cracking hydrogen production catalyst provided by an exemplary embodiment of the present application. As shown in Figure 2 the preparation method of the molecular sieve confined ammonia cracking hydrogen production catalyst includes the following steps: Step 210: Dissolve the soluble template agent in deionized water, add an alkali source, stir until completely dissolved, and obtain solution A.

[0069] Step 220: Add a soluble silicon source to solution A and stir after ultrasonic treatment for 1 hour.

[0070] Step 230: Add a soluble active component to the mixed solution of the organic ligand and water, stir to dissolve, and obtain solution B.

[0071] Among them, the noble metal ruthenium loading in the soluble active component is 1%-5%, and the transition metal loading is 1%-10%.

[0072] Step 240: Slowly add solution B to solution A to obtain solution C.

[0073] Step 250: Move solution C to a reaction kettle and react at a fixed temperature in an oven.

[0074] Among them, the reaction temperature is 120°C-180°C, and the reaction time is 24h-96h.

[0075] Step 260: Filter the reacted solution and wash it with an ethanol aqueous solution for 3 times to obtain catalyst D.

[0076] Step 270: Dry catalyst D in a drying box.

[0077] Among them, the drying temperature is 40°C-80°C; and the drying time is 6h-12h.

[0078] Step 280: Calcine the dried catalyst D at a fixed temperature in a reducing atmosphere to obtain the target catalyst.

[0079] The application provides a preparation method of a molecular sieve confined ammonia cracking hydrogen production catalyst.

[0080] In an embodiment, the implementation of the step 280 can be: calcining the dried catalyst D in a reducing atmosphere for 1-5 hours to obtain the target catalyst; wherein the reducing atmosphere comprises one of hydrogen and ammonia, and the concentration of the reducing atmosphere is 3-10%.

[0081] Embodiment: The application adopts the following steps to prepare the target catalyst: 1. Dissolve 16.27 g of tetrapropylammonium hydroxide in 21.5 ml of deionized water, add 0.063 g of potassium hydroxide and 0.65 g of aluminum hydroxide, and stir until completely dissolved to obtain solution A; 2. Add 10.42 g of tetraethyl orthosilicate to the solution A and ultrasonically treat for 1 h, and then stir; 3. Add 0.14 g of ruthenium trichloride to a mixed solution of 1 ml of ethylenediamine and 10 ml of water, and stir to dissolve to obtain solution B; 4. Slowly add the solution B to the solution A to obtain solution C, and observe the state change of the solution C after 30 minutes; 5. Move the solution C to a reaction kettle, and react in an oven at a temperature of 170 DEG C for 4 days; 6. Filter the reacted solution, and wash with an ethanol aqueous solution for 3 times, and the product is marked as catalyst D; 7. Place the catalyst D in a drying box and dry at 80 DEG C overnight; 8. Reduce the dried catalyst D in 9% ammonia for 2 hours to obtain the target product, the molecular sieve confined ammonia cracking hydrogen production catalyst.

[0082] The application tablets the sample to be tested and passes through a 40-60 mesh sieve, takes 1 g of the catalyst, and loads the catalyst into the center of a quartz tube clamped with quartz wool, switches the gas to pure ammonia, then adjusts the catalyst bed to the target reaction temperature, and analyzes the product composition and content change through a gas chromatograph. Specifically, the molecular sieve confined ammonia cracking hydrogen production catalyst prepared by the application has a NH3 conversion rate of more than 90% under the conditions of 4500 L / kg -1 h -1 , 400 DEG C. Figure 3

[0083] In the following, reference is made to Figure 4 ​An electronic device according to embodiments of the present application will be described. The electronic device can be either one or both of the first and second devices, or a stand-alone device independent of them, which can communicate with the first and second devices to receive the acquired input signals therefrom.

[0084] Figure 4 A block diagram of an electronic device according to embodiments of the present application is illustrated.

[0085] As Figure 4 shown, the electronic device 10 includes one or more processors 11 and a memory 12.

[0086] The processor 11 can be a central processing unit (CPU) or other form of processing unit having data processing and / or instruction execution capabilities, and can control other components in the electronic device 10 to perform desired functions.

[0087] The memory 12 can include one or more computer program products, which can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory, for example, can include random access memory (RAM), cache memory, and / or the like. The non-volatile memory, for example, can include read only memory (ROM), hard disk, flash memory, and / or the like. One or more computer program instructions can be stored on the computer-readable storage media, which the processor 11 can execute to implement the methods of the various embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, and the like can also be stored in the computer-readable storage media.

[0088] In one example, the electronic device 10 can further include input and output means 13 and 14, which are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0089] When the electronic device is a stand-alone device, the input means 13 can be a communication network connector for receiving the acquired input signals from the first and second devices.

[0090] Further, the input means 13 can include, for example, a keyboard, a mouse, and the like.

[0091] The output means 14 can output various information including the determined distance information, direction information, and the like, to the outside. The output means 14 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0092] Of course, to simplify, Figure 4Only some of the components of the electronic device 10 related to the present application are shown, and components such as a bus, an input / output interface, and the like are omitted. In addition, the electronic device 10 can include any other appropriate components according to the specific application.

[0093] In addition to the methods and devices described above, an embodiment of the present application can be a computer program product which includes computer program instructions workable to cause a processor to perform the steps of the methods according to the various embodiments of the present application described in the above "Exemplary Methods" section of this specification when the computer program instructions are run by the processor.

[0094] The computer program instructions can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, and the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server.

[0095] In addition, an embodiment of the present application can be a computer readable storage medium having stored thereon computer program instructions which can cause a processor to perform the steps of the methods according to the various embodiments of the present application described in the above "Exemplary Methods" section of this specification.

[0096] The computer readable storage medium can be any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0097] The above describes the basic principles of the present application in combination with specific embodiments, but it needs to be pointed out that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present application to be necessarily implemented with the above specific details.

[0098] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0099] It also needs to be pointed out that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present application.

[0100] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0101] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A hydrogen production catalyst by molecular sieve confined ammonia cracking, characterized by, Comprising: an active component, an alkali source, an organic ligand, a template agent, a silicon source, and an aluminum source.

2. The molecular sieve confined ammonia cracking for hydrogen production catalyst of claim 1, wherein, The active component includes a noble metal, a noble metal salt, or a transition metal.

3. The molecular sieve confined ammonia cracking for hydrogen production catalyst of claim 2, wherein, The noble metal includes ruthenium, and the transition metal includes any one or a combination of more than one of the following metal materials: nickel, cobalt, iron, molybdenum.

4. The molecular sieve confined ammonia cracking catalyst of Claim 1, wherein the molecular sieve is a zeolite. The alkali source includes any one or a combination of more than one of the following: sodium hydroxide or potassium hydroxide.

5. The molecular sieve confined ammonia cracking hydrogen production catalyst of claim 1, wherein, The organic ligand includes any one or a combination of more than one of the following: ethylenediamine, triethylamine, 1,3-di(imidazolyl)butane, 1,3-di(imidazolylmethyl)benzene, 1,10-phenanthroline, 2,2'-bipyridine-4,4'-dicarboxylic acid.

6. The molecular sieve confined ammonia cracking hydrogen production catalyst of claim 1, wherein, The silicon source includes any one or a combination of more than one of the following: water glass, silica sol, fumed silica, white carbon black, tetraethyl orthosilicate.

7. The molecular sieve confined ammonia cracking hydrogen production catalyst of claim 1, wherein, The aluminum source includes any one or a combination of more than one of the following: molecular sieve, aluminum nitrate, aluminum sulfate, aluminum chloride, aluminum hydroxide, sodium metaaluminate, pseudo-boehmite, aluminum isopropylate.

8. The molecular sieve confined ammonia cracking for hydrogen production catalyst of claim 1, wherein, The template agent includes at least one of the following: tetraethylammonium hydroxide, tetrapropylammonium hydroxide, N,N,N-trimethyl-1-adamantammonium hydroxide, N-N-N-trimethyladamantylammonium bromide, N-N-N-trimethyladamantylammonium iodide, benzyltrimethylammonium hydroxide, N,N-dimethyl-N-ethylcyclohexylammonium, triethylamine phosphate, 3,3,5-trimethylcyclohexyl, N,N,N-trimethylcyclohexylammonium.

9. A method for preparing a molecular sieve confined ammonia cracking hydrogen catalyst, characterized in that, Comprising: dissolving a soluble template agent in deionized water, adding an alkali source, stirring until completely dissolved to obtain solution A; adding a soluble silicon source to solution A and stirring after ultrasonic treatment for 1 hour; adding a soluble active component to a mixed solution of an organic ligand and water, stirring to dissolve to obtain solution B; slowly adding solution B to solution A to obtain solution C; transferring solution C to a reaction kettle and reacting at a fixed temperature in an oven; filtering the reacted solution and washing with an ethanol aqueous solution 3 times to obtain catalyst D; drying catalyst D in a drying box; calcining dried catalyst D at a fixed temperature in a reducing atmosphere to obtain a target catalyst.

10. The method of claim 9, wherein the catalyst is prepared by the steps of: (a) preparing a mixture of a molecular sieve and a porous support; (b) impregnating the mixture with a solution of a transition metal compound; (c) drying the mixture; and (d) calcining the mixture. The calcining of dried catalyst D at a fixed temperature in a reducing atmosphere to obtain a target catalyst includes: calcining dried catalyst D in a reducing atmosphere for 1-5 hours to obtain a target catalyst; wherein the reducing atmosphere includes one of hydrogen or ammonia, and the concentration of the reducing atmosphere is 3%-10%.

Images