387 results about "Heteropoly acid" patented technology

The present application relates to the technical field of catalysts and relates to a non-noble metal cathode hydrogen evolution catalyst for PEM water electrolysis and a use thereof. The present application provides a method for preparing a cathode hydrogen evolution catalyst. A nickel-molybdenum heteropoly acid having a specific structure is generated in situ on the surface of a porous carbon material carrier, and is used as a hydrogen evolution catalyst active component precursor, and an in-situ generated nickel-containing molybdenum sulfide active component is subjected to sulfidation treatment to prepare a non-noble-metal-supported cathode hydrogen evolution catalyst, wherein the in-situ generated nickel-containing molybdenum sulfide active component has a hydrogen adsorption free energy similar to that of Pt and catalytic hydrogen evolution activity, the dispersity is good, and the number of active sites is large, thereby reducing the costs of the catalyst; in addition, during the sulfidation treatment of the nickel-molybdenum heteropoly acid, nitrogen or phosphorus atoms in the carrier can be doped into the lattice of molybdenum disulfide, thereby reducing the hydrogen evolution Gibbs free energy of sulfur atoms on an MoS2 crystal basal surface, and more active sites are formed on a sulfur edge and a molybdenum edge, facilitating a hydrogen evolution reaction.

The invention relates to the technical field of proton exchange membranes, and provides a covalent grafted heteropoly acid modified perfluorosulfonic acid membrane as well as a preparation method and application thereof. According to the invention, polypropylene glycol monoalkyl ether and Keggin type vacancy heteropoly acid are subjected to covalent grafting, and then the obtained covalent grafted heteropoly acid is used as an additive to modify the perfluorosulfonic acid membrane, so that the leakage problem of heteropoly acid in the proton exchange membrane can be effectively relieved, and meanwhile, the excellent proton conduction performance of heteropoly acid is also retained; moreover, the polypropylene glycol monoalkyl ether has relatively large molecular weight, so that the heteropoly acid can be anchored more firmly in the perfluorosulfonic acid membrane, and the proton conduction capability of the heteropoly acid is fully exerted. The result of the embodiment shows that the covalent grafted heteropoly acid modified perfluorosulfonic acid membrane provided by the invention shows excellent proton conduction performance and chemical stability, and has a wide application prospect.

The invention provides a proton exchange membrane, a preparation method thereof and a fuel cell, and relates to the technical field of fuel cells. The proton exchange membrane comprises a base material with a porous structure, pores of the base material contain active components, and the active components comprise a heteropolyacid modified MOF material and sulfonated polyfluorene biphenyl indole; the weight ratio of the heteropoly acid to the MOF material is 1: (1-3). The proton exchange membrane provided by the invention has the characteristics of excellent mechanical durability, high proton conductivity and ultra-thinness, and can improve the mechanical strength, ductility and chemical stability of the membrane while reducing the expansion of the membrane.

The invention relates to the technical field of heavy metal recovery, in particular to a method for recovering heavy metal from metal waste. Comprising the following steps: preparing silicon-tungsten composite acid salt; preparing heteropolyacid powder; preparing a resin heteropolyacid composite material; heavy metals are recovered from metal wastes by a resin adsorption method. The silicon-tungsten composite acid salt is prepared under mild conditions through reaction of sodium metasilicate, sodium tungstate and potassium chloride, the operation is simple, the conditions are easy to control, the silicon-tungsten composite acid salt has rich active sites and a large specific surface area, the surface of the silicon-tungsten composite acid salt carries negative charges, and the surface of the silicon-tungsten composite acid salt is not prone to damage. Compared with a traditional chemical precipitation method, the method for extracting the heavy metal by using the silicon-tungsten composite acid salt does not need to add a large number of chemical reagents, and secondary pollution is reduced.

The invention provides a synergistic accelerant suitable for SNCR (selective non-catalytic reduction) denitration and application of the synergistic accelerant. The synergistic accelerant comprises the following components in parts by weight: 2-80 parts of an activating agent, the activating agent is selected from at least one of sodium glycinate, sodium glutamate, sodium iminodiacetate, sodium aspartate, sodium aminopropionate, sodium aspartate and potassium aspartate; 3-12 parts of a catalyst, wherein the catalyst is selected from soluble heteropolyacid; 1-10 parts of a catalytic promoter; the catalytic promoter is selected from at least one of soluble tungstate and molybdate. A trace amount of synergistic accelerant is added into a common SNCR denitration solution, so that the reaction speed of NOx and reducing agents such as ammonia or urea can be increased, a temperature window of SNCR reaction moves downwards, the application range of the traditional SNCR technology is expanded, the removal efficiency of NOx is improved, and a low-cost and high-efficiency method is provided for pollution abatement of nitric oxide in waste gas.

The purpose of the present invention is to provide: a novel resist material containing (A) a heteropoly acid salt having a modified defect site or a mixture of such heteropoly acid salts; a pattern formation method; and a patterned structure.

The invention relates to a method for determining potassium by using a nano-enzyme-based colorimetric probe, and the probe and application thereof. The invention relates to a method for determining potassium by using a nano-enzyme-based colorimetric probe, which comprises the following steps of: synthesizing copper and cerium-containing phosphotungstic acid nano-enzyme by using phosphotungstic acid, cerous nitrate and copper chloride as precursors through a hydrothermal method, detecting the absorbance of K < + > standard solutions with different concentrations by using the copper and cerium-containing phosphotungstic acid nano-enzyme as a probe, establishing a quantitative relation between the absorbance and the K < + > concentration, drawing a standard curve, obtaining a regression equation, and determining the potassium content by using the regression equation. And detecting the absorbance of the sample determination standard solutions with different concentrations, and obtaining the K < + > content of the sample through the regression equation. According to the method, the nano-enzyme (Cu, Ce-PWs) is prepared by using tungsten-molybdenum heteropoly acid with high negative charges, unique chelating properties and various structures and Ce < 4 + > and Cu < 2 + > as raw materials, strong mimic enzyme laccase activity is generated through the synergistic effect of Ce atoms and Cu atoms, and the activity of the mimic enzyme laccase is further improved in the presence of H2O2.

The invention discloses a preparation method and application of an oil-soluble heteropolyacid ionic liquid catalyst. The catalyst is composed of organic cations and inorganic anions, the cations are one of quaternary ammonium, imidazole and pyridine cations containing long-chain alkyl, the anions are heteropolyacid anions, the long-chain alkyl enables the catalyst to have good oil solubility, the catalyst can be efficiently dispersed in the waste grease, heteropolyacid provides active sites, and the catalyst can be used for treating the waste grease. Nano-scale active particles are formed after in-situ vulcanization, and the catalytic hydrogenation effect is achieved. The invention also provides a preparation method of the oil-soluble heteropolyacid ionic liquid catalyst, the catalyst can be prepared from tertiary amine and halogenated hydrocarbon through three-step reaction of alkylation, anion exchange and acid-base neutralization, the preparation process is simple, a highly toxic reagent is avoided, and the cost is low. The catalyst provided by the invention can be used for catalytic hydroisomerization of various waste oils and fats, has the characteristics of high conversion rate, low coking rate and high product calorific value, and has relatively high industrial application potential.

The invention belongs to the technical field of NH3 catalytic oxidation catalysts, and particularly relates to a preparation method and application of a surface defect-rich catalyst for NH3 catalytic oxidation, and the preparation method comprises the following steps: (1) mixing heteropolyacid, a molecular sieve and deionized water, grinding, carrying out vacuum drying, and calcining in an inert atmosphere to obtain catalyst carrier powder; (2) weighing a manganese precursor salt and an auxiliary agent precursor salt, dissolving the manganese precursor salt and the auxiliary agent precursor salt in water to prepare an aqueous solution, adding the catalyst carrier into the aqueous solution of the manganese precursor salt and the auxiliary agent precursor salt, carrying out vacuum drying, and calcining in an inert atmosphere to obtain a supported catalyst; and (3) reducing the supported catalyst in a mixed reducing atmosphere containing CO / inert gas to obtain the catalyst with rich surface defects. According to the method disclosed by the invention, rich defect sites can be constructed on the surface of the catalyst, the NH3 catalytic oxidation activity of the catalyst under a wide temperature window is promoted, and meanwhile, the N2 selectivity is improved.

The invention discloses vacancy heteropolyacid, a preparation method thereof and application of the vacancy heteropolyacid in electrolytic coupling hydrogen production, and belongs to the technical field of catalysts. The preparation method comprises the following steps: by taking phosphomolybdic acid as a raw material, preparing vacancy heteropolyacid by adjusting the pH value to 2-6 or adding high-concentration acid for acidification and heating; the high-concentration acid is 0.1-6 M phosphoric acid or a mixed acid of 0.1-3 M phosphoric acid and 0.1-6 M sulfuric acid or 0.1-1 M perchloric acid. The rate of oxidizing biomass and organic wastewater by the vacancy phosphomolybdic heteropolyacid prepared by the method is 10-20 times of that of complete Keggin type phosphomolybdic acid. The invention further provides an organic wastewater degradation and electrolytic hydrogen production coupling process, vacancy heteropoly acid can be regenerated and recycled, and coupling hydrogen production can be achieved.

The application discloses a kind of heteropoly acid assisted ball milling modified micron zero-valent iron particles, preparation method and application.The micron zero-valent iron particles are mainly prepared by mixing micron zero-valent iron, heteropoly acid and relatively cheap noble metal compound, and the specific preparation is that micron zero-valent iron, heteropoly acid and noble metal compound are placed in a ball mill jar and a specific atmosphere to carry out ball milling modification to obtain heteropoly acid modified ultra-low ruthenium loaded micron zero-valent iron particles.The particles provided by the application have extremely strong reaction performance on chlorinated hydrocarbons, and the performance does not attenuate for more than 30 cycles, and can achieve complete dechlorination on low concentration and high concentration chlorinated hydrocarbons, which has great water treatment application value.

The purpose of the present invention is to provide: a novel resist material which contains (A) a heteropoly acid salt that has a modified defect site and is represented by general formula (I) or a mixture of such heteropoly acid salts, said salt or mixture having a cation moiety into which a sulfonium cation, sulfonium dication, or iodonium cation having one or more polar groups that have an acid dissociable group has been introduced; a pattern formation method; and a patterned structure. (I) (Am+)a(Bn+)b(C(am + bn)-)

The invention relates to the technical field of catalysts, and discloses a foam structure catalyst and a preparation method and application thereof. The foam structure catalyst comprises a foam structure, metal M2, metal oxide M2Ox, heteropolyacid salt of the metal M2, optional tungsten oxide WOz1 and optional molybdenum oxide MoOz2, the metal M2, the metal oxide M2Ox and the heteropolyacid salt of the metal M2 grow on the foam structure, z1 is equal to 2-3, and z2 is equal to 2-3; wherein the heteropolyacid salt is selected from one or more of tungstate and molybdate, M2 is selected from one or more of Cu, Ni, Fe, Zn and Co, and x is equal to 0.5 to 1.5; the foam structure contains metals M1 and M1Oy, M1 is selected from one or more of foam iron, foam nickel and foam cobalt, and y is equal to 1-1.5. The foam structure catalyst can be used for stable hydrogenolysis of glucose, the glucose conversion rate stably reaches 100% in a continuous fixed bed reactor, and the selectivity of 1, 3-propylene glycol is larger than or equal to 55%, and the selectivity of ethyl alcohol is larger than or equal to 48%.

The invention discloses a method for preparing heteropolyacid from scheelite in a short process and application of the heteropolyacid to a flow battery, and the preparation method comprises the following steps: S1, carrying out water leaching and acidolysis on scheelite and sodium silicate according to a molar ratio of W to Si of (1-3): 1, and then carrying out solid-liquid separation to remove insoluble substances; s2, adding a precipitant into the leachate to enable the silicotungstic heteropoly acid to form silicotungstate precipitation, so as to realize salting-out-precipitation purification of the Keggin-configuration silicotungstic heteropoly acid; and S3, redissolving the silicotungstate precipitate obtained in the step S2, acidifying, extracting, recrystallizing and purifying to obtain the Keggin configuration silicotungstic heteropoly acid with battery grade purity. The invention innovatively provides a method for in-situ decomposition of scheelite and direct short-process preparation of the heteropolyacid electrolyte for the flow battery, so that clean and efficient utilization of tungsten resources is realized, and a new technical approach is provided for short-process preparation of the heteropolyacid flow battery electrolyte; and the production cycle and the cost of the electrolyte of the flow battery are obviously reduced.

The invention belongs to the field of polymer catalysis, and discloses a DMF (Dimethyl Formamide)-based heteropolyacid synergistic catalysis system as well as a preparation method and application thereof. The method comprises the following steps: adding sodium molybdate and disodium hydrogen phosphate into deionized water, adjusting the pH value to 2-3, then adding sodium metavanadate, heating and stirring at 95-100 DEG C, cooling at room temperature, and then adding diethyl ether and a sulfuric acid solution until an upper diethyl ether phase becomes light yellow from colorless; and drying the lowermost layer phase yellow oily substance, grinding and drying to obtain H5PMo10V2O40, and adding the H5PMo10V2O40 into a DMF (Dimethyl Formamide) solvent to prepare the DMF-based heteropolyacid synergistic catalysis system. According to the method, DMF is used as a solvent, the D-fructose is catalytically cracked in oxygen through a one-step method to be converted into DFF, gas does not need to be switched in the reaction process, and the prepared catalytic system is excellent in catalytic benefit, can be recycled, saves manpower and material resources in the catalytic process, is low in equipment requirement and can be suitable for reactions such as catalytic cracking of biomass.

The invention provides a preparation method of a dication positive electrode material. The preparation method comprises the following steps: preparing a conductive polymer monomer and a heteropoly acid aqueous solution; carrying out electrolysis on the heteropolyacid aqueous solution; after electrolysis, Li2CO3 and Na2CO3 are added, and after the reaction is completed, separated-out heteropoly blue lithium sodium crystals are separated; adding the crystals into a conductive polymer monomer aqueous solution to obtain a mixture; dropwise adding an excessive strong oxidizing acid dilute solution into the mixture, and reacting at 140-180 DEG C for 16-24 hours; and repeatedly washing the separated solid substance after the hydrothermal reaction with deionized water, and drying to obtain the dicationic positive electrode material. The form of the heteropoly blue lithium sodium still keeps the skeleton structure of heteropoly acid radical anions, and the skeleton structure can ensure that lithium ions and sodium ions can be transmitted in the skeleton of the heteropoly blue lithium sodium; and the conductive polymer prepared by the method is of a porous structure, and sodium ions with large radius can be transmitted through pores of the conductive polymer, so that the ionic conductivity of the heteropoly blue lithium sodium can be improved to a certain extent.

The invention provides a preparation method, a product and application of an acid site / carrier decoupled metal-acid multifunctional catalyst, and belongs to the technical field of biomass energy utilization. According to the preparation method, a metal active site is provided by non-noble metal Ni, a neutral material h-BN is taken as a carrier, and a Ni element is reduced and loaded on h-BN under an alkaline condition by adopting a liquid phase reduction method, so that the Ni / h-BN catalyst is prepared; and then heteropoly acid is used for providing an acid site, the acid site is loaded on a Ni / h-BN catalyst through an impregnation method, and Ni-HSiW / h-BN is prepared. According to the present invention, by flexibly regulating and controlling the acid site (loaded or unloaded heteropolyacid), the required product can be selectively obtained when the obtained catalyst is used for catalyzing the lignin derivative hydrodeoxygenation reaction, and by regulating and controlling the temperature, the time and other parameters of the hydrodeoxygenation reaction, the high selectivity on the reaction product can be provided.

The present invention discloses a method for preparing furfural, which includes: under the action of a heteropolyacid-based phase transfer catalyst, an intramolecular dehydration reaction occurs for xylose-based carbohydrates in a ternary two-phase reaction medium composed of a low-boiling organic solvent, a protic solvent, and an ionic organic ammonium chloride. The catalyst used in the present invention has the property of phase transfer, that is, its solubility in the reaction medium increases at high temperature, and it catalyzes the dehydration of xylose in the form of a liquid acid; after the reaction, the solubility decreases and it precipitates in the form of a solid, which is convenient for the recovery and separation of the catalyst, and largely solves the problems of low efficiency of solid acid catalysts and difficult separation of liquid acid catalysts. And an advanced reaction medium is coupled to increase the solubility of xylose-based carbohydrates and the solvation effect on xylose. Through the optimization of the catalyst and the reaction medium, the reaction performance of the reaction system is effectively improved.

The invention discloses an NMR (nuclear magnetic resonance) method for characterizing solid catalyst acid pair evolution and application, which comprises the following steps: selecting double-ended 1, 2-bis (dimethyl phosphine) ethane (DMPE) as a probe molecule, taking a solid catalyst molecular sieve as an example, and carrying out a series of advanced one-dimensional and two-dimensional homonuclear / heteronuclear related NMR detection; through systematic analysis of experimental results, spatial interaction information among different acid centers is obtained, direct evidence of acid pair evolution is obtained, the problem that the evolution of acid pairs in the solid catalyst is difficult to accurately characterize by the conventional experimental means is mainly solved, and understanding and understanding of a concerted catalytic reaction mechanism of the acid pairs in the solid catalyst can be deepened. The method is easy to operate, accurate in result and suitable for identifying acid pairs in various solid catalysts such as molecular sieves, oxides and heteropoly acid.

The invention belongs to the field of organic synthesis, and relates to a green synthesis method of retinaldehyde, in particular to a heteropolyacid catalyzed safe and green synthesis method of retinaldehyde. The preparation method comprises the following steps: heating, stirring and processing retinol serving as a raw material in an organic solvent under the action of heteropoly acid (HPA), and cooling and directly filtering after the reaction is finished, thereby obtaining the retinol. And the heteropoly acid is CsCu2PMo11VO40, CsCu3PMo11VO40 or CsCu4PMo11VO40, and the molecular formula of the heteropoly acid is CsCu2PMo11VO40 or CsCu3PMo11VO40. The preparation method provided by the invention has the advantages of low cost of used materials, mild reaction conditions, less generation of three wastes in the production process, short process flow and capability of effectively reducing the production cost, and the prepared retinaldehyde has relatively high yield.

The invention provides a composite proton exchange membrane, a preparation method thereof and a proton exchange membrane fuel cell. The composite proton exchange membrane comprises reinforced base cloth and modified perfluorinated sulfonic acid resin layers arranged on the surfaces of the two sides of the reinforced base cloth. The modified perfluorinated sulfonic acid resin layer is doped with a modifier, and the modifier comprises heteropoly acid and sulfonated polyether-ether-ketone. The heteropoly acid and the sulfonated polyether ether ketone are introduced at the same time, and the heteropoly acid can adsorb more water molecules, so that the water retention capacity of the membrane at high temperature and low humidity is improved; sulfonated polyetheretherketone can quickly transfer protons, increase the total number of ion transfer groups in the membrane and improve the conductivity of the membrane; the glass transition temperature of the sulfonated polyetheretherketone is high, and the sulfonated polyetheretherketone also has better stability at high temperature; therefore, the electrical properties of the composite proton exchange membrane are greatly improved through the synergistic cooperation of the two components, and the composite proton exchange membrane also has extremely high conductivity even in a high-temperature and low-humidity environment. The fuel cell prepared on the basis of the composite material shows extremely high electrical properties.

The invention discloses a preparation method of intermediate carbon microspheres, which comprises the following steps of: preparing precursor asphalt by taking naphthenic base aromatic hydrocarbon-rich heavy oil as a raw material and adopting a low-temperature thermal polycondensation process; the preparation method comprises the following steps: carrying out fluidized bed hydrotreatment on precursor asphalt under proper reaction conditions by matching with a proper isomerization functional catalyst and a molecular sieve catalyst to obtain refined aromatic hydrocarbon-rich distillate oil with a boiling range of more than 400 DEG C, and taking the refined aromatic hydrocarbon-rich distillate oil as a raw material; the preparation method comprises the following steps: carrying out a catalytic polycondensation reaction under the dual catalytic action of a heteropolyacid aluminum salt catalyst and a heteropolyacid ferric salt catalyst to obtain intermediate pitch, extracting the intermediate pitch through an extraction solvent, removing isotropic pitch components to obtain green carbon microspheres, and finally carrying out carbonization treatment on the green carbon microspheres to obtain the mesocarbon microbeads. The invention provides a brand new aromatic hydrocarbon-rich raw material refining treatment process through technical coupling, has the advantages of wide raw material application range and high production efficiency, and opens up a new path for low cost and high quality of mesocarbon microbeads.

The invention discloses a silver-based electromagnetic shielding coating layer and a preparation method thereof, and belongs to the technical field of electromagnetic shielding materials. The coating layer comprises the following components in parts by mass: 30-50 parts of composite modified polystyrene silver-loaded microspheres, 80-150 parts of epoxy resin, 15-40 parts of a polyether amine epoxy curing agent, 0.5-2 parts of a defoaming agent and 0.5-2 parts of a flatting agent, and the coating layer is obtained by mixing all the components, coating the insulating carrier with the mixture and curing. The composite modified polystyrene silver-loaded microspheres are prepared by modifying sulfhydrylated polystyrene microspheres with trimethylpropane monoallyl ester, modifying with histidine, quaternizing, loading with phosphotungstic heteropoly acid and carrying out reduction loading with silver ions. The phosphotungstic heteropoly acid anchors silver ions to form a uniform and compact silver layer, and the silver-loaded microspheres form a three-dimensional conductive network to ensure the shielding effectiveness; the organic modified layer and the epoxy resin matrix form strong interface combination to avoid agglomeration and sedimentation; the oxidation resistance is improved through a multi-barrier structure, the quaternary ammonium salt has the antibacterial property, and high conductivity, excellent oxidation resistance, good matrix compatibility and shielding stability are achieved.

The invention belongs to the field of catalysts and preparation thereof, and particularly relates to a catalyst, a preparation method thereof and a method for preparing peroxy acid. The catalyst comprises a modified molecular sieve and heteropoly acid loaded on the modified molecular sieve, and the surface of the modified molecular sieve is modified with alkyl and amino. When the catalyst is used for preparing peroxy acid, the conversion rate of organic acid can be increased, the equilibrium conversion rate is higher than 60%, and the selectivity of the prepared peroxy acid is gt; in addition, the catalyst can be recycled, and is suitable for industrial production.

The purpose of the present invention is to provide: a novel resist material which contains (A) a heteropolyacid salt in which a deficient site is modified, represented by general formula (I), or a mixture thereof, said heteropolyacid salt or mixture thereof having, in an anionic portion thereof, at least one polar group which has an acid-dissociable group, and (B) an acid generating agent; a pattern formation method; and a patterned structure. (I) (Am+)a(Bn+)b(C(am + bn)-)

The application discloses a preparation method and application of PTFE catalytic filter material, and the preparation of the PTFE catalytic filter material comprises MnCeTi catalyst preparation, PTFE catalytic fiber preparation, heteropoly acid functionalization and needling. The three-dimensional flower-shaped spherical structure of the prepared PTFE catalytic filter material is used to optimize the mass transfer and conversion channel of pollutants, the intermetallic interaction of Mn, Ce and Ti is used to regulate the surface acid sites and active sites of the catalyst, the surface oxygen vacancies, acid sites and other characteristics are further optimized through the heteropoly acid functionalization, and the low-temperature catalytic dioxin performance of the PTFE catalytic filter material is effectively improved. Meanwhile, the heteropoly acid can form polyoxometalate on the surface of the catalyst, the adhesion strength of the catalyst and the filter material is strengthened, the loss problem of the catalyst in the use process is effectively relieved, and the prepared PTFE catalytic filter material has high efficiency and long-term use performance.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a preparation method of a W-Re alloy precursor and a high-density and high-hardness W-Re alloy. Hydrogen peroxide dissolves tungsten powder in waste tungsten powder and converts it into soluble polytungstic acid to form a polytungstic acid-hydrogen peroxide mixed solution, and then rhenium powder is added. The rhenium powder forms a low-valent rhenium compound soluble in water in the mixed solution, and the polytungstate reacts with the heteroatom Re to form a heteropolyacid anion cluster with a multi-nuclear structure, thereby achieving the purpose of tungsten coating rhenium, so that the segregation of rhenium can be suppressed in the process of evaporation and crystallization, and the rhenium is evenly distributed in the precursor powder. The nano W-Re alloy powder prepared by the invention has a large number of whiskers in morphology, can improve the density and hardness of the W-Re alloy, and its density is ≥96.8%, and HV30 is ≥590.

The invention relates to the technical field of gas adsorption materials, in particular to a heteropoly acid modified GO-coated MMT composite material and a preparation method and application thereof. The preparation method comprises the following steps: ultrasonically dispersing graphite oxide in deionized water, stirring for 2-4 hours to obtain a graphite oxide solution, adding methylcyclopentadienyl manganese tricarbonyl into ethylene glycol, and stirring for 12-24 hours to obtain an MMT solution; pouring the graphite oxide solution into the MMT solution, reacting at 150-180 DEG C for 8-12 hours, washing, and freeze-drying to obtain GO-coated MMT composite hydrogel; and adding the GO-coated MMT composite hydrogel into deionized water, then adding heteropoly acid, stirring at 60-80 DEG C for 8-12 hours, and carrying out suction filtration and washing to obtain the heteropoly acid modified GO-coated MMT composite material. According to the heteropolyacid modified GO (at) MMT composite material disclosed by the invention, a complex with strong electrostatic adsorption force can be formed on the surface of GO (at) MMT by introducing heteropolyacid, and meanwhile, Bronsted acid sites and Lewis acid sites are increased, so that the adsorption performance is enhanced, and low-concentration ammonia gas adsorption is realized.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing peroxy acid. The method comprises the following steps: S1, carrying out reaction on organic acid, hydrogen peroxide, a catalyst and a solvent in a first pre-reactor, and introducing a product obtained by the reaction into a first reactive distillation tower for reaction; s2, reacting the product obtained in the step S1 in a second pre-reactor, and introducing the product into a second reactive distillation tower for reaction after the reaction is finished; s3, the product obtained in the step S2 and a stabilizer are subjected to a reaction in a mixer, the stabilizer is a nitrogen-containing alkaline compound, lone pair electrons exist on N atoms, and the catalyst is selected from one or two or more of sulfuric acid, nitric acid, isopolyacid and heteropolyacid. By adopting the method to prepare the peroxy acid solution, the selectivity and yield of peroxy acid can be improved, and the total conversion rate of hydrogen peroxide is gt; the selectivity of peroxy acid is gt; meanwhile, caprolactone is prepared by using the peroxy acid to dissolve cyclohexanone oxide liquid, and the conversion rate of cyclohexanone is gt; the selectivity of the obtained caprolactone is gt; 85%.

The invention provides a preparation method of sclareolide and a catalyst, and belongs to the technical field of organic catalysis. The method comprises the following steps: dissolving sclareol by using a first solvent, adding a catalyst, adjusting the pH value of the solution under microwave conditions, dropwise adding hydrogen peroxide, heating and stirring for reaction, separating the catalyst, reusing, extracting the product by using a second solvent, and heating and refluxing to obtain sclareolide; the catalyst is imidazolyl ionic liquid / polyethylene glycol / maleic acid modified graphene oxide loaded with vacancy heteropolyacid salt. According to the preparation method of sclareolide, microwave-assisted reaction is adopted, so that the product yield of sclareolide is greatly improved. According to the invention, two mutually compatible reaction systems of alcohol and water are adopted, so that the environmental protection property of the process is greatly improved, and meanwhile, under the action of the catalyst, the method has a phase catalytic transfer effect, the reaction efficiency is improved, the reaction condition is mild, the product yield is high, and the method has a wide application prospect.