1288results about How to "Good catalytic" patented technology

The invention discloses a magnesium-based composite hydrogen storage material comprising the following compositions by weight percent: 1.0-10.0% of Al, 1.0-5.0% of Ni, and the balance of Mg. A preparation method thereof comprising the following steps: at first, smelting block-shaped metal Mg and Al by a medium frequency induction to prepare Mg17Al12 alloy which is crushed to 300 meshes; hydrogenising Mg powder at 340 DEG C under a hydrogen atmosphere of 4.0MPa to prepare MgH2; then blending Mg17Al12, MgH2, Ni powder in accordance with contents by weight percent for ball-grinding for 60 to 100 hours under an atmosphere of argon. The magnesium-based composite hydrogen storage material can reversely absorb and release hydrogen at low temperature, and has high hydrogen storage capacity, excellent activation performance and superior hydrogen absorbing and releasing kinetics property. The magnesium-based composite hydrogen storage material can be used for manufacturing hydrogen source to facilitate purification and storage and transportation of hydrogen, and can also used for hydrogen storage material for fuel cells.

The invention relates to a preparation method of a nano particle carbon nanotube compound catalyst. The carbon nanotube with electric charges on surface is obtained from the materials which can generate non-covalent action with the carbon nanotube. Then nano particle with opposite electric charges on surface to that of the non-covalent modified carbon nanotube is added and completely mixed, and excess nano particle is removed to finally obtain the nano particle carbon nanotube catalyst compound. A plurality of nano particle carbon nanotube catalyst compounds can be prepared by the invention, all of which represent very good catalytic activities. The invention adopts the method of non-covalent modified carbon nanotube to obtain carbon nanotube with perfect surface. Meanwhile, the invention provides the nano particle, in particular, the morphology controllable nano particle on the load of carbon nanotube with an effective way by utilizing the electrostatic interaction of carbon nanotube and namo particle, thus extending the applications of morphology controllable nano particle in catalytic field.

The invention discloses a light oil type hydrocracking catalyst with a composite molecular sieve. The hydrocracking catalyst comprises the composite molecular sieve consisting of a modified Y-molecular sieve and a modified ZSM-23 molecular sieve, a carrier composed of micropore aluminum oxides, and a hydrogenation activity component composed of a VIB group metal and a VIII group metal. The hydrocracking catalyst is characterized in that the composite molecular sieve comprises the modified Y-molecular sieve and the modified ZSM-23 molecular sieve, and the Y-molecular sieve is modified and dealuminized, so that heat stability and hydrothermal stability are stably enhanced, the hydrophobicity is enhanced, the absorption and desorption properties of the molecular sieve are improved, and the catalyst achieves a high catalytic cracking property. The pore passages of the modified SM-23 molecular sieve are unobstructed, the number of the acid sites is small, the isomerism property is outstanding, and the octane value of the molecular sieve is increased because of light naphtha components. The modified Y-molecular sieve and the modified ZSM-23 molecular sieve are mixed and used according to a formula ratio of the hydrocracking catalyst, so that both the cracking activity and the isomerism property are considered, and the final catalyst achieves an ideal catalytic effect.

The invention discloses a solid base catalyst for preparing bio-diesel, characterized in that porous material with the same cubage is dipped in alkali metal or alkaline earth metal soluble salt solution and transition metal element or thulium soluble salt solution, whose weight proportion is that porous material: alkali metal or alkaline earth metal soluble salt: transition metal element of thulium soluble salt is 1: 0.02-1: 0.001-0.2; it is dried, baked, rubbed and screened to be obtained. The invention is provided with good catalytic performance, easy treatment after transesterification, no waste liquid generated and easy separation. It can be used repeatedly and it is easy to be used in industry.

The invention relates to a method for preparing polyol ester lubricating oil by using a composite solid acid catalyst. The method comprises the following steps of: adding a water carrying agent into polyol ester and monobasic fatty acid, performing esterification reaction under the action of the composite solid acid catalyst, and dehydrating and esterfying to obtain raw ester; performing filter pressing on the raw ester to separate the raw ester from the solid acid catalyst, wherein the catalyst can be recycled; and performing reduced pressure distillation on the raw ester to remove the residual fatty acid, and then deacidifying and decolorizing to refine with heating by using a refining adsorption bed layer respectively to obtain low-acid value polyol ester lubricating oil. The method has the advantages that the catalyst can be recycled, the esterification rate is high, an aftertreatment process is simple, and a product is low in acid value, high in purity, environment-friendly and suitable to be produced industrially. The reaction esterification rate can reach over 99 percent, and the acid value of the ester product obtained through refining can be controlled to be less than 0.01mg KOH / g. The product is excellent in visco-temperature performance, high in lubricity and thermal stability, strong in hydrolytic stability, low in volatility and excellent in electrical insulation property.

The invention relates to the field of chemistry, in particular to the treatment of contaminants. A sulfide-containing industrial wastewater treatment reagent comprises a Fenton reagent containing an iron source and hydrogen peroxide, and also comprises sulfide, wherein the sulfide is mixed in the Fenton reagent to be used as a cocatalyst of the Fenton reagent. Compared with the traditional homogeneous Fenton reaction system, the cheap and readily available sulfide is used as the cocatalyst, so that the catalytic reaction is firstly carried out on the surface of the sulfide to improve the efficiency of decomposition of hydrogen peroxide to generate hydroxyl radicals during the Fenton reaction process and improve the degradation efficiency and the utilization efficiency of the hydrogen peroxide, and the sulfide per se can be recycled, and the problem of producing a large amount of iron sludge by homogeneous Fenton can be avoided, thereby reducing the treatment cost.

The invention belongs to the field of novel technology of biological energy, and provides a catalyst for preparing alkane by catalytically hydrogenating biological oil. The catalyst is characterized in that 10 to 50 percent of non-precious metal nickel salt, molybdenum salt, cobalt salt and tungsten salt are adopted as active ingredients, a modified molecular sieve / aluminum oxide is used as a catalyst carrier; the catalyst carrier is loaded with one or two and more than two of 10 to 50 percent of molybdenum, nickel, cobalt and tungsten to obtain a catalyst precursor for hydrogenating and refining the biological oil; the precursor is activated for 2 to 6 hours under the hydrogen atmosphere of 300 to 600 DEG C to obtain the catalyst for preparing the alkane by catalytically hydrogenating biological oil. The non-sulphurized biological oil hydrogenation refined catalyst is used for substituting the metal sulfide catalyst and the precious metal catalyst of the hydrogenation deoxidation reaction, the production cost is reduced, and the crisis of the shortage of the fossil energy can be alleviated.

To solve a problem that in a battery having a negative electrode having a capability of releasing a metal ion, a positive electrode for causing a liquid such as water or seawater to contribute to battery reaction, and an inorganic solid electrolyte, the inorganic solid electrolyte contacts the positive electrode for a long term, whereby a deterioration is generated from the interface between the electrolyte and the positive electrode so that the battery capacity falls or the battery cannot give a high power. The positive electrode and the inorganic solid electrolyte are not brought into contact with each other. Preferably, the interval between the positive electrode and the electrolyte is set to 0.3 nm or more.

The invention discloses a preparation method of crosslinkable polyethylene cable material, which includes the steps and the following components are represented in proportion by weight: throwing polyethylene 75-95 proportion by weight, ethylene-vinyl acetate copolymer 0-20 proportion by weight, unsaturated silicone hydride 1.0-5 proportion by weight, free radical evocating agent 0.1-0.5 proportion by weight, organotin catalyst 0.1-1 proportion by weight, organic acid compound 0.1-1 proportion by weight, anti-oxidant 0.1-0.5 proportion by weight, anti-copper agent 0.1-0.5 proportion by weight, and lubricant 0.5-2 proportion by weight into the high speed mixing machine with rotary speed at 80-120 rpm for mixing 15-25 minutes, and then adding the mixture into the double-screw extruder, melting and prilling for obtaining crosslinkable polyethylene cable material. The method provided by the invention mixes all the material and dispersing uniformly, and then executes grafting reaction, thereby realizing more uniform grafting reaction and guaranteeing homogeneity of the crosslinking process, in addition, the invention uses organic acid compound which remarkably improves catalysis function of organotin catalyst, and improves crosslinking speed of silicone hydride, and overcomes the defect that the conventional silicone hydride crosslinked plastic can be linked only in warm water or steam environment with long time cooking, thereby saving production cost for manufacturer considerably. The crosslinkable polyethylene cable material obtained according to the invention is extruded by plastic cable extrusion machine unit for obtaining cable insulation layer, and is placed under the condition of 23 DEG C. with 50% humidity for one day naturally, then the crosslinking process is finished, moreover the product can pass performance indexes of hot extension performance test, dynamics test and aging characteristic test according to the national standard request.

The invention relates to a micro-nano-structure anode material for a Li-air battery and a preparation method of the micro-nano-structure anode material. The preparation method comprises the following steps of: preparation of hollow composite precursor fibers through electrostatic spinning by blending a metal nitride catalyst precursor with a high-carbon polymer in an organic solvent, preprocessing of the precursor fiber material, nitridation of complex fibers, and pore-forming and pore-expansion through activation. The preparation method is simple in technique and convenient to operate and is easy to realize the uniform distribution of nanoscale catalyst particles in hollow carbon fibers. A prepared anode material tube is hollow internally, a plurality of holes are formed on the wall of the tube, and metal nitride catalysts are uniformly distributed in the three-dimensional holes of the wall of the tube, so that high specific surface area provides a sufficient place for the reaction of the battery, and the hollow pore passage in the tube can ensure an oxygen diffusion channel to be smooth and has good ion transport capacity and electrical conductivity. According to the invention, the charge-discharge capacity of the Li-air battery can be improved effectively, the power multiplying performance and the power density of the Li-air battery can be improved, the internal resistance of the battery can be reduced, and the charge-discharge polarization can be lessened through the uniform distribution of the nanoscale metal nitride, therefore, the micro-nano-structure anode material has good industrialization prospect.

The invention relates to a preparation method of an active carbon loaded catalyst for electrochemically catalyzing and degrading organic wastewater and belongs to the technical field of preparation of catalysts. The preparation method comprises the following steps: preparing an active carbon solid containing a plurality of types of active metal by using a sol-gel method; adding P2O5 powder into the active carbon solid containing the active metal and roasting; sublimating the P2O5 powder into gas at a high temperature; and when the gas is expanded at the high temperature and escapes, generating a plurality of small pores in the active carbon, so that the specific surface area and adsorption capability of the active carbon are improved. According to the preparation method, rare earth metal is used in match with the other active metal so that grains on the surface of the catalyst are uniform and thinned; and meanwhile, the preparation method is combined with a method of adding the P2O5 powder to roast, so that the catalysis efficiency of the prepared active carbon loaded catalyst can be improved by more than 5%-15%. The method has a simple process, is convenient to operate and is low in cost; and in a process of electrochemically catalyzing and degrading the organic wastewater by using the prepared catalyst, other oxidants do not need to be additionally added and the large-scale industrialized application of the preparation method is facilitated.

The invention discloses a compound photocatalyst and a preparation method and application thereof. The compound photocatalyst is formed by compositing metal oxide and quantum dot materials, wherein the metal oxide accounts for, by mass, 80%-99.99% of the photocatalyst, and the quantum dot materials account for, by mass, 0.01%-20% of the photocatalyst, zinc oxide or titanium oxide serves as the metal oxide, and graphene quantum dots serve as the quantum dot materials. The preparation method includes the steps of sequentially conducting stirring, mixing, ultrasonic processing and drying on the metal oxide and the quantum dot materials. The photocatalyst can absorb full-wave-band light of sunlight and can improve the photoelectric conversion efficiency; meanwhile, the photocatalyst can restrain compositing of carriers and comprehensively improve the photocatalytic efficiency; compared with photocatalysts of other types, the photocatalyst has higher catalysis efficiency and a higher catalysis speed for decomposers; the sunlight is more sufficiently and comprehensively used, and the compound photocatalyst has the advantages of being low in price and easy to obtain.

The invention provides a monatomic iron nitrogen-doped porous carbon catalyst as well as a preparation method and application thereof. In the catalyst, monatomic iron is taken as an active component, a nitrogen-doped porous carbon material is taken as a carrier, and iron is dispersed on the surface and the interior of the nitrogen-doped porous carbon material in a monatomic form, wherein every 100 wt% of the monatomic iron nitrogen-doped porous carbon catalyst contains 1.0-3.0 wt% of iron and 4.0-9.0 wt% of nitrogen. The invention also provides a method for catalyzing a nitrogen heterocyclic compound with the monatomic iron nitrogen-doped porous carbon catalyst for a dehydrogenation oxidation reaction and application of the monatomic iron nitrogen-doped porous carbon catalyst for catalyzing the nitrogen heterocyclic compound for the dehydrogenation oxidation reaction. The catalyst has an excellent catalytic effect; a product is analyzed by GC-MS (gas chromatography-mass spectrometer) after a catalytic reaction is ended; and an analysis result indicates that no by-product is produced, and the activity of the catalyst is not obviously reduced after the catalyst is used for 5 times.

The invention discloses a preparation method of isobide. Sorbierite is used as raw material and H3PO4 modified tetravalent metal oxides are used as catalyst to prepare the isobide by the dehydration reaction. The method has the advantages of simple operation process, low production cost, little environmental pollution, easy separation and recovery. The used modified catalyst has obvious catalytic effect. The selectivity of the isobide reaches as high as 63.49 percent, and the yield reaches as high as 62.23 percent. With strong practicality, the method is novel and can satisfy the industrialization requirements.

The invention discloses a porous carbon loaded nano metal oxide catalyst, a preparation method of catalyst, and a hydrogen storage material applying the catalyst. The preparation method comprises the following steps: (1) immersing an organic metal framework into a mixed solution of furfuryl alcohol and alcohol, and stirring for 12-60 hours under a sealed condition; (2) filtering a product obtained from the step (1) to obtain solid powder, and rising the temperature to 140-165 DEG C under inert atmosphere protection; (3) rising the temperature of the product obtained from the step (1) to 700-1000 DEG C under inert gas flow protection; and keeping the temperature and cooling so as to obtain the porous carbon loaded nano metal oxide catalyst. The preparation method of the catalyst provided by the invention is simple and convenient; the hydrogen storage material in which the catalyst is added has the advantages of low hydrogen discharge temperature, high hydrogen discharge velocity, good hydrogen absorption and discharge reversibility and long circulation service life.

The invention discloses a metal-organic framework nanocrystal loaded polyurethane foam as well as a preparation and an application thereof. Polyurethane prepolymer and active amino on MOFs (Metal-Organic Frameworks) are taken to perform chemical doping, the great challenge that MOFs materials are difficult to process is overcome, MOFs nanoparticles are uniformly loaded in the polyurethane foam, a foam reactor is obtained by means of in-situ forming, a new process of building a complex mesoporous-microporous assembly based on microporous metal-organic skeleton nanoparticles as structural units is provided to observe catalysis of the MOFs nanoparticles on knoevenagel condensation; as water serves as a foaming agent and a green chemical method is adopted to prepare an integral flow-by foam reactor to catalyze an organic reaction, aftertreatment of a catalyst is simplified, loss of the catalyst is avoided, continuous flow-by cyclic catalyzation can also be performed, and a new method is provided for the treatment of environmental pollution and chemical industry.

The object of the invention is to provide a loaded type iron-nickel phosphide catalyst material, a preparation method therefor and an application of the loaded type iron-nickel phosphide catalyst material. The loaded type iron-nickel phosphide catalyst material is characterized in that a catalyst active component is a multicomponent alloy compound which is formed through mutually doping elements, i.e., Fe, Ni and P, a catalyst carrier is a composite oxide carrier which is prepared from TiO2 and a second kind component, the second kind component is one or more of SiO2, Al2O3, ZrO2, CeO2 and La2O3, the weight percent of TiO2 accounts for 5.0wt% to 95wt% the weight of the composite carrier, the loaded amount of the catalyst active component Fe is 0.5wt% to 80wt%, the loaded amount of the metal active component Ni is 0.05wt% to 30wt%, and the loaded amount of the nonmetal adjuvant P is 0.5wt% to 15wt%. The catalyst has very good reaction activity, stability and selectivity, can be applied to a reaction for preparing aromatic compounds through catalyzing the degradation of biomass oil and can also be applied to a hydrodeoxygenation reaction for compounds containing aromatic hydrocarbon C-O bonds or alkyl C-O bonds.

The invention discloses a titanium-silicon molecular sieve compound catalyst and a preparation method thereof. The method comprises the following steps of: fully mixing a titanium-silicon molecular sieve, an acid molecular sieve, a polymeric monomer polyene-based compound and a pore forming agent; undergoing a polymerization reaction in the presence of an initiator; smashing an obtained lump solid catalyst; adding into a halogenated hydrocarbon for swelling; and extracting and activating with a solvent to obtain a molded titanium-silicon molecular sieve compound catalyst. Due to the adoption of the catalyst obtained in the invention, a corresponding process for preparing a corresponding diol compound by performing alkene epoxidation and undergoing a one-step hydration reaction can be realized, the problem of difficulty in separating titanium-silicon catalyst powder from a reaction solution can be solved simultaneously, and the reaction efficiency is increased. The catalyst is particularly suitable for catalytic reaction processes for preparation of ethylene glycol from ethylene, preparation of 1,2-propylene glycol from ethylene, alkene epoxidation, preparation of alcohol ether by etherification, and the like with a fixed bed process.

The present invention relates to curatives for epoxy resins, and compositions (e.g. adhesives) containing such resins cured using the same methods of preparation and uses therefor. More specifically, the present invention relates to hybrid curatives for epoxy resins comprising both aromatic amine, phenol and / or phenyl ester moieties. A further aspect of the current invention relates to new imidazole catalysts that possess a combination of excellent cure latency as well as low cure temperature onset.

The invention provides an amino metal organic framework material containing an active metal component. The amino metal organic framework material is used as a carrier; and the active metal component is dispersed in the carrier, wherein the weight of the active metal component is 0.05-15% of that of the amino MOFs material. According to the invention, a mixed solution is formed from the carrier and an active metal precursor containing a carbanyl group; amino in the MOFs material is reacted with the carbanyl group in the active metal precursor, so that the active metal precursor is connected to the MOFs material; then, the material is prepared through a reduction method; uniform dispersion of the active metal component in the MOFs material is realized; when the material is used as the catalyst, the catalytic effect is obvious because of high dispersion of the active component, for example, the amino metal organic framework material is used in a process for preparing aromatic amine by hydrogenation reduction of an aromatic nitro compound, etc.

The invention provides a high-activity wet-oxidation catalyst using carbon as carrier as well as its preparing method. It contains one of the noble metals: Pt, Pd, Ru, Ir Rh and Au, uses carbon as carrier and has the weight percents of component: noble metal 0.25-0.5% and the rest carbon, where the carbon surface area is 80-1500 sq m / g. It can heighten dipersivity and utilization ratio of noble metal and at the same time has stronger ability to absorb organic matters and dissolved oxygen, very adaptive to catalysis and its content of noble metal is only 1 / 4-1 / 8 of Japanese similar catalysts and its catalyzing activity is 15-75% higher than the Japanese similar catalysts'. It can largely reduce processing cost and is an effective way to extend the application of wet catalytic oxidizing technique in processing waste water.

The invention discloses a method for preparing 1,2-pentanediol by furfuryl alcohol liquid phase selectivity and hydrogenolysis. According to the invention, a non-precious metal catalyst with environmental protection and high efficiency is selected, which concretely relates to the supported Bu-based catalyst, and then furfural is used for preparing 1,2-pentanediol with high activity and high selectivity under mild hydrogenation condition. The catalyst of the present invention uses furfuryl alcohol with high concentration even pure furfuryl alcohol as a raw material, so that energy consumption for separating a solvent can be reduced.

The invention discloses a solid basic catalyst, a preparation method of the solid basic catalyst and an application of the solid basic catalyst in ester exchange reaction. The solid basic catalyst catalyzes the ester exchange reaction by the reaction of metal organic compound and hydroxyl on a carrier under the moderate conditions to synthesize dimethyl carbonate. The solid basic catalyst provided by the invention consists of metal organic alkali and the carrier. The metal organic alkali is linked to the carrier in bond-forming manner; the metal organic alkali is one or more of lithium methoxide, lithium ethoxide, lithium isopropoxide, lithium n-butoxide, lithium tert-butoxide, sodium methoxide, sodium ethoxide, sodium isopropoxide, sodium n-butoxide, sodium tert-butoxide, potassium methoxide, potassium ethoxide, potassium isopropoxide, potassium n-butoxide and potassium tert-butoxide; the carrier is one or more of silicon oxide, aluminium oxide, titanium oxide, zirconia, mesoporous silicon oxide synthesized by the template method, mesoporous aluminium oxide synthesized by the template method, mesoporous titanium oxide synthesized by the template method, and mesoporous zirconia synthesized by the template method.

A carbon quantum dot based on a copper complex and a preparing method thereof are disclosed. Copper disodium ethylenediaminetetraacetate having a saturated Schiff base structure is adopted as a raw material, the copper complex and a carbon quantum dot having a structure similar to that of graphene are composited, and the carbon quantum dot based on the copper complex is prepared by a thermo-polymerization method so as to improve electron transfer capability of photosensitizers of this type. The prepared carbon quantum dot based on the copper complex is good in water solubility, electron receptivity, electron releasing capability and electrical conductivity and wide in visible-light response range, and is an excellent photosensitizer. By application of the photosensitizer into a photooxidation reaction of 1,4-dihydropyridine, efficient photo-catalytic oxidation of reactions of this type is achieved and byproducts only comprise water and oxygen.

The invention discloses a CO2 electro-reduction catalyst catalytic material and preparation and application thereof. The electro-reduction catalytic material is mainly a monoatomic catalytic materialusing a three-dimensional porous carbon aerogel as a carbon carrier, and the material is obtained through high-temperature pyrolysis synthesis, and synthetic raw materials comprise the carbon carrier(graphene and carbon nanotubes), hydrogen peroxide, chlorate, melamine foam and deionized water. The structure of the material is that metal atoms are anchored on a nitrogen-doped carbon substrate andapplied to an electroreduction carbon dioxide gas diffusion electrode. The catalyst is applied to the reaction of producing carbon monoxide by carbon dioxide electroreduction, and has good reaction activity, high CO selectivity and stable catalytic performance.

The invention discloses a nanometer iron oxide / carbon sphere compound catalyst and a preparation method and an application thereof, which belong to the technical field of catalysts. Iron oxide nano particles are uniformly loaded on the surfaces of carbon spheres. The preparation method comprises the following steps of modifying the surfaces of the carbon spheres by performing a Fenton reaction, i.e., under the strong oxidizing property in the coexistence of hydrogen peroxide and ferrous ions; and uniformly loading iron oxide on the surfaces of the carbon spheres to obtain the nanometer iron oxide / carbon sphere compound catalyst. Due to the adoption of the method, the problems of severe aggregation and the like of a nanometer iron oxide catalyst and the like are solved, and the obtained nanometer iron oxide / carbon sphere compound catalyst is taken as an efficient combustion catalyst for solid propellants, a catalyst for photo-degradation organic matters, and a catalyst for petroleum cracking.

The invention provides a bismuth vanadate-graphene composite photocatalyst, and preparation and application thereof, and aims to provide a visible-light-responsive bismuth vanadate-graphene composite photocatalyst which has low production cost, short preparation period and high photocatalytic activity. The preparation method comprises the following production steps: 1, preparing a graphene oxide colloidal suspension; 2, preparing a bismuth vanadate-graphene oxide compound from bismuth nitrate, ammonium metavanadate and the graphene oxide colloidal suspension; 3, putting the product obtained in the step 2 in a microwave reactor to prepare a bismuth vanadate-graphene compound; and 4, performing centrifugal separation on the product obtained in the step 3, washing with redistilled water, and drying. The bismuth vanadate-graphene composite photocatalyst provided by the invention is high in photocatalytic activity and low in production cost; and the preparation method of the bismuth vanadate-graphene composite photocatalyst, provided by the invention, is simple to operate, short in preparation period, friendly to environment and suitable for commercial popularization.

The invention discloses a preparation method of a sulfur doped Ni-Fe hydroxide nano-film catalyst for decomposing water to produce oxygen. According to the method, an aqueous solution which contains NiCl2, FeCl2, thiocarbamide and polyethylene glycol 1,000 is used as electrodeposition liquid, and a sulfur doped Ni-Fe hydroxide nano-film catalyst is directly electro-deposited on the surface of a metal strip or a foam metal substrate by an electrodeposition method. The preparation method is simple, the cost is low, the obtained catalyst is used for catalyzing decomposition of water to produce oxygen, a function of reducing overpotential of oxygen evolution of electrolysed water is good under larger current density, the catalytic activity is high, and the catalyst cannot drop from the surface of the substrate easily.

The invention relates to a metal-organic framework crystalline material with a nano-cage structure, in particular to a polyoxometalate (POM)-based metal-organic frameworks (POMOFs) crystalline material with a nano-cage structure and a preparation method and application thereof and aims to solve the problems in the prior art that a POMOFs crystalline material with a nano-cage structure is high in synthesis difficulty and poor in rhodamine B organic dye degradation effect. The POMOFs crystalline material has the chemical formula of Ag10(tta)4(H2O)4(SiW<IV>10W<V>2O40), the tetragonal system, and the space groups of I-4m2, alpha=90, beta=90, gamma=90 and Z=2. The preparation method comprises the following steps: dissolving silicotungstic acid, silver nitrate, tetrazole and a mineralizer in distilled water; regulating the pH value; carrying out a reaction for 3 days at 160 DEG C. The POMOFs crystalline material with the nano-cage structure can be obtained.