57results about How to "Maintain catalytic activity" patented technology

The invention relates to a metal additive modified Pt-loaded CeO2 catalyst, preparation and application thereof in CO oxidation, and belongs to the technical field of industrial catalysis. The preparation process of the catalyst mainly comprises the following steps: respectively dissolving cerium salt, platinum salt and auxiliary metal salt in deionized water to prepare corresponding precursor solutions; then, mixing the three solutions, and dropwise adding ammonia water under a stirring condition until yellow precipitates are generated; and finally, drying and washing the precipitate, and calcining the solid powder in a proper atmosphere to obtain the assistant metal modified Pt / CeO2 catalyst. La, Pr, Nd or Sm auxiliary metal is introduced into the Pt / CeO2 catalyst, so that the CO catalytic oxidation performance of the catalyst can be improved, and the poisoning resistance of the catalyst in an SO2-containing environment can be enhanced. The method has important significance in the actual industrial application, especially in the catalytic oxidation process under the condition of treating complex flue gas.

The invention discloses a multilayer nanostructure metal hydride and a preparation method thereof.The preparation method comprises the steps that transition metal ion salt and a carbon material are added into a polar solvent to be mixed, heating and stirring are conducted to obtain solid powder, and the solid powder is subjected to a hydrogen thermal reduction reaction to obtain a functionalized carbon material; a metal hydride raw material and a functionalized carbon material are added into an organic solvent, ultrasonic treatment and mixing are carried out, a mixed solution is obtained, and the metal hydride raw material is a mixture of an alkyl metal Mg compound or an alkyl metal Li compound and a borane compound; and in a hydrogen atmosphere, carrying out solvothermal reaction on the mixed solution, and then centrifuging, washing, filtering and drying to obtain the multilayer nanostructure metal hydride. The multilayer nano-structure metal hydride prepared by the preparation method has relatively high hydrogen absorption and hydrogen storage capacity.

The invention discloses a T7 RNA (Ribonucleic Acid) polymerase mutant, and the T7 RNA polymerase mutant comprises any one or more of the following amino acid mutation sites: W797L, P657K, Y846R, M306K, N601E, P476E, S606V, K642G, P742G, I117L, Q786L, S430P, L446F or T375K, and the T7 RNA polymerase mutant has RNA polymerase activity. The invention also discloses an application of the T7 RNA polymerase mutant in in-vitro transcription, non-coding RNA synthesis, RNA drug synthesis, in-vivo protein expression or cell-free protein expression.

The invention discloses a low-density flame-retardant organic silicon foam composition, a silicon rubber foam material and a preparation method of the low-density flame-retardant organic silicon foam composition and the silicon rubber foam material, and the foam composition comprises the following components in parts by weight: (A) 100 parts of organopolysiloxane; (B) 5-100 parts of a reinforcing filler; (C) 20-100 parts of a composite flame-retardant filler; (D) 1-10 parts of a structuring control agent; (E) 1-10 parts of a foaming agent; (F) 1-10 parts of an auxiliary foaming agent; (G) 1-10 parts of hydrogen-containing siloxane; (H) 0.01-3 parts of a platinum group metal compound catalyst; (I) 0.01-1 part of an inhibitor; according to the organic silicon foam composition, the component (F) and the component (E) are introduced, so that the foaming speed and the curing speed can be better matched, the organic silicon foam composition has a relatively high foaming ratio after being cured, the density of a material can be remarkably reduced, and meanwhile, foam pores of foam are uniform and fine in size.

The present application relates to a kind of catalyst for hydrogen chloride oxidation preparation chlorine and its preparation method and application.The preparation method includes: after carrier substrate, metal tantalum powder, binder solution are mixed, extrusion forming is obtained green body, the green body is prepared composite carrier by calcination, the mass fraction of metal tantalum powder in the composite carrier is 5%-30%;Inorganic salt containing catalytically active element is made into solution and is placed in the composite carrier, and after drying, pre-product is obtained, and the pre-product is prepared catalyst by calcination.The preparation method described in the present application prepares high thermal conductivity composite carrier, not only effectively improves the heat conduction efficiency of catalyst, guarantees the effective activity of catalyst, but also guarantees the stability of composite carrier, thereby effectively prolongs the life of catalyst.

The invention provides a fuel cell ORR catalyst and a preparation method and application thereof. The fuel cell ORR catalyst comprises a nitrogen-doped porous carbon core, a nitrogen-doped porous carbon coating layer arranged on the surface of the nitrogen-doped porous carbon core, and doped metal simple substances distributed in pore channels of the nitrogen-doped porous carbon core and the nitrogen-doped porous carbon coating layer, the ratio of micropores in the nitrogen-doped porous carbon core is gt; the total proportion of mesopores and macropores in the nitrogen-doped porous carbon core; the ratio of micropores in the nitrogen-doped porous carbon coating layer is lt; the total ratio of mesopores to macropores in the nitrogen-doped porous carbon coating layer is 1: 1. The nitrogen-doped porous carbon structure monatomic catalyst with multiple micropores inside and multiple mesopores / macropores outside is obtained through gradient pore channel design in space in combination with a CVD coating technology, and dissolution and loss of metal elementary substances are greatly inhibited while the catalytic activity of the catalyst is guaranteed, so that the service life of the catalyst is prolonged.

The invention relates to the technical field of organic liquid hydrogen storage, in particular to dehydrogenation equipment and method in the organic liquid hydrogen storage process, the dehydrogenation equipment comprises a hydrogen storage organic liquid dehydrogenation tank, the middle of the hydrogen storage organic liquid dehydrogenation tank is fixedly connected with a catalyst replacement track, and the inner side of the inner wall of the catalyst replacement track is sleeved with an annular chain; a plurality of dehydrogenation catalyst beds are fixedly connected to the outer side of the annular chain, material ports are formed in the two sides of the top of the outer wall of the catalyst replacement rail correspondingly, and a connecting pipeline and a dehydrogenation catalyst regeneration device are fixedly connected to the upper portions of the material ports. The hydrogen storage organic liquid dehydrogenation device has the advantages that the catalyst replacement track with the dehydrogenation catalyst bed is arranged in the middle of the hydrogen storage organic liquid dehydrogenation tank, so that the dehydrogenation catalyst bed carrying a dehydrogenation catalyst can move on the catalyst integrated track, and the dehydrogenation catalyst in the hydrogen storage organic liquid dehydrogenation tank is replaced; the dehydrogenation equipment can replace the dehydrogenation catalyst while dehydrogenation treatment is carried out.

The application provides a method for preparing two-dimensional titanium dioxide microwires by using a high-viscosity system and application. The method comprises the following steps: providing a high-viscosity system, wherein the high-viscosity system is an aqueous solution of guar gum hydroxypropyltrimethyl ammonium chloride; and performing high-speed shearing treatment on the high-viscosity system; adding liquid tetrabutyl titanate into the high-viscosity system, stirring, centrifugal drying, and obtaining the two-dimensional titanium dioxide microwires. The preparation method is simple, reaction conditions are normal temperature and normal pressure, the method is easy to control, mass production is realized, and the prepared two-dimensional titanium dioxide microwires have good catalytic activity.

The invention provides special phenyl silicone oil for cosmetics and a preparation method of the special phenyl silicone oil, and belongs to the technical field of material chemistry. The preparation method comprises the following steps: carrying out prepolymerization and ring-opening copolymerization reaction on raw materials including trimethyl triphenyl cyclotrisiloxane, diphenyl double-end socket and a solid catalyst to obtain a copolymer; carrying out reduced pressure distillation on the copolymer to obtain special phenyl silicone oil; the solid catalyst is obtained by the following steps: preparing a magnetic core material containing an anionic polymer; carrying out coating treatment on the magnetic core material by adopting an organic matter containing a cationic polymer to obtain magnetic particles; preparing a silicon dioxide porous carrier by adopting a raw material comprising magnetic particles; ammonium dihydrogen phosphate is loaded on a silicon dioxide porous carrier, and an acidic solid catalyst is obtained. According to the method, the catalyst which is good in catalytic effect and convenient to recycle and recycle is adopted, so that the environment-friendly degree of phenyl silicone oil production is improved, and the production cost is reduced.

The invention provides a solid-phase supported catalyst for preparing dimethyl carbonate as well as a preparation method and application of the solid-phase supported catalyst, and belongs to the technical field of catalyst preparation. The solid-phase supported catalyst comprises an active component and a carrier, the active component is cuprous chloride, the carrier is hydroxyapatite, the mass ratio of the cuprous chloride to the hydroxyapatite is 1: 5-1: 8, the solid-phase supported catalyst provided by the invention can be used for preparing the dimethyl carbonate, the dosage of the cuprous chloride active component in the solid-phase supported catalyst is small, and the solid-phase supported catalyst can be used for preparing the dimethyl carbonate. The solid-phase supported catalyst has the advantages that the solid-phase supported catalyst prepared by the method is favorable for reducing the loss of Cl in catalytic reaction and the corrosion to equipment, the high methanol conversion rate of 12-15% and the high DMC selectivity of 95-99% are obtained in the preparation of dimethyl carbonate, and the solid-phase supported catalyst can be recycled.

The invention belongs to the technical field of catalyst preparation and thermocatalytic degradation of VOCs (Volatile Organic Compounds), and relates to a Pd / Ti / CeO2 toluene thermocatalytic degradation catalyst with sulfur resistance. According to the catalyst, CeO2 is used as a carrier, noble metal Pd is used as an active component, and the sulfur resistance is improved by doping Ti into the CeO2 carrier. The preparation process is a two-step wet impregnation method and comprises the following steps: 1) adding a certain amount of CeO2 carrier and water into a titanium precursor ethanol solution, carrying out oil bath evaporation at 80 DEG C to obtain white precipitate, drying and roasting to obtain a Ti / CeO2 carrier; and 2) dispersing the Ti / CeO2 carrier into a solution with water, adding a Pd precursor salt solution with a certain concentration, uniformly stirring, evaporating to dryness, drying, and roasting to obtain the Pd / Ti / CeO2 catalyst. The catalyst provided by the invention is simple in preparation method, low in noble metal loading capacity, high in VOCs thermocatalytic degradation efficiency and high in sulfur resistance, and has a huge application prospect in the aspect of treating VOCs waste gas with high sulfur content.

The invention relates to the technical field of batteries, and discloses a high-toughness anode support and a preparation method and application thereof. The preparation method of the high-toughness anode support comprises the following steps: mixing nickel oxide, electrolyte powder, starch and rare earth aluminate, and carrying out ball milling treatment to obtain anode powder; anode powder is pressed by adopting a dry pressing method to obtain an anode support body green sheet, and the high-toughness anode support body is obtained after high-temperature calcination. The ferroelastic domain converted rare earth aluminate is added into the anode support body, so that the mechanical strength and the fracture toughness of the anode support body are remarkably improved, the fracture toughness of the cell is improved, and the electrochemical performance and the catalytic activity of the anode of the proton conductor fuel cell are maintained; and the integrity of the whole battery structure and the performance reliability of the electric pile are ensured.

The invention provides environment-friendly vinyl silicone oil and a preparation method thereof, and belongs to the technical field of material chemistry. The preparation method of the environment-friendly vinyl silicone oil comprises the following steps: feeding cyclic polysiloxane and an end-capping reagent into a reaction device, and heating and dehydrating under inert gas protection and vacuum conditions; adding a solid catalyst into the reaction device, and heating for reaction; adjusting substances in the reaction device to be neutral, and performing reduced pressure distillation to remove low-boiling-point substances to obtain vinyl silicone oil; the solid catalyst is prepared by the following steps: preparing a magnetic core material; coating the surface of the magnetic core material to obtain magnetic particles; preparing a porous carrier from a raw material comprising magnetic particles; and loading the catalyst on a porous carrier to obtain the solid catalyst. According to the method, the catalyst which is good in catalytic effect and convenient to recycle and recycle is adopted, so that the environment-friendly degree of vinyl silicone oil production is improved, and the production cost is reduced.

The invention relates to a metal-encapsulated hydroisomerization catalyst, a preparation method thereof and application of the metal-encapsulated hydroisomerization catalyst in preparation of biological aviation kerosene from cyperus esculentus oil, metal species are encapsulated into a framework of a molecular sieve SAPO-11 through an in-situ encapsulation method, and the hydroisomerization catalyst with proper isomerization performance and cracking performance is prepared; the catalyst has relatively high thermal stability, and can have relatively high yield and isomerization ratio when being applied to a reaction for preparing biological aviation kerosene by hydroisomerization and hydrocracking of a hydrodeoxygenation product of vegetable oil.

The invention relates to the field of semiconductor materials, in particular to a preparation method of a titanium dioxide-calcium carbonate composite photocatalytic material, which comprises the following steps: step 1, polishing and cleaning the surface of a pure titanium sample, removing oil stain and an oxide layer on the surface, and drying for later use; 2, the pure titanium sample treated in the step 1 serves as an anode of a micro-arc oxidation reaction, a stainless steel electrolytic cell serves as a cathode, electrolyte is added into the stainless steel electrolytic cell, the micro-arc oxidation reaction is conducted, and a porous titanium dioxide structure is prepared; step 3, cleaning and drying the porous titanium dioxide structure for later use; 4, the micro-arc oxidation sample treated in the step 3 is put into a mixed reaction solution of deionized water, Na2CO3 and Ca (NO3) 2 to be subjected to centrifugal oscillation for 10-20 min, cleaning and drying are conducted after the reaction is completed, and the titanium dioxide-calcium carbonate composite structure is prepared. The preparation method provided by the invention reduces waste emission and energy consumption, and better meets the requirements of environmental protection and energy conservation.

The application belongs to the field of petroleum refining catalysis technology, and discloses a ZSM-5 additive for increasing propylene production and a preparation and use method thereof. In the method, waste filtrate prepared by using SAPO-34 molecular sieve is used to improve the stability of the molecular sieve under a high-temperature water-containing atmosphere, prevent the molecular sieve channels from being blocked by excessive phosphorus elements, reduce environmental pollution caused by the waste filtrate, improve the specific surface area of the ZSM-5 additive and the stability of the product, realize the dual effects of the stabilization of the molecular sieve by the phosphorus elements and the protection of the organic ammonium channels, complement the low-molecular-weight ammonium polyacrylate, white carbon black and phosphorus aluminum binder, construct a hierarchical pore structure (micropore-mesopore-macropore hierarchical pore), and then obtain the additive with a specific surface area of 150-170 m 2 / g, an addition amount of only 10 wt% can achieve a propylene production effect better than that of 20 wt% of a commercially available additive, the catalyst procurement cost of a refinery is greatly reduced, and the slurry oil yield is reduced and the heavy oil cracking capacity is improved.

The invention discloses a CuFeS2 and FeS2 composite Fenton-like catalyst as well as a preparation method and application of the CuFeS2 and FeS2 composite Fenton-like catalyst. According to the preparation method disclosed by the invention, the natural pyrite does not need a further forming process and has good adsorbability on copper ions, and a Cu element is embedded into a pyrite crystal lattice through a citrate dipping-anaerobic calcining process, so that the CuFeS2-FeS2 composite Fenton-like catalyst with a heterostructure is formed. The catalyst disclosed by the invention can activate peroxymonosulfate and hydrogen peroxide to generate active oxygen species, so that different types of organic pollutants such as sodium dodecyl benzene sulfonate, tetracycline hydrochloride, rhodamine B and the like which are common in water, such as surfactants, antibiotics, dyes and the like can be quickly degraded and mineralized. The granular catalyst with good catalytic performance is prepared from the pyrite with huge reserves in nature as a raw material through a simple dipping-calcining process, and the method has the advantages of high feasibility, low cost, easiness in industrial preparation and the like.

The invention relates to the technical field of solid biomass waste recycling and biomass activated carbon preparation, in particular to a perovskite active agent loaded coconut shell activated carbon composite material and a preparation method and application thereof. The preparation method of the perovskite active agent loaded coconut shell activated carbon composite material comprises the following steps: preparing coconut shell activated carbon by taking coconut shell as a raw material; laCo (1-x) MnxO3 is prepared, the molar ratio of lanthanum to cobalt to manganese is 1: (1-x): x, and x is 0-1; and loading LaCo < 1-x > Mn < x > O < 3 > on the coconut shell activated carbon to obtain the perovskite active agent loaded coconut shell activated carbon composite material. According to the preparation method, the problems that in the prior art, extra electrification is needed for electrolysis, the raw material proportion requirement is high, the proportion is complex, and the method is not suitable for large-scale industrial production are solved, efficient absorption of the harmful dye malachite green in the printing and dyeing wastewater is achieved, and the preparation method has important research significance and environment-friendly application value.

The application discloses a kind of photocatalytic nanocomposite and its preparation method and application, belong to nanocomposite technical field, first synthesis CuInS2 quantum dot powder, a layer of carbon is covered on the surface of CuInS2 quantum dot powder, then amino is introduced by silane coupling agent modification, then modified carbon composite CuInS2 quantum dot powder is loaded on tubular carbon nitride powder formed.The tubular structure of tubular carbon nitride powder is conducive to CuInS2 quantum dot dispersion on its surface or inside, so that the active site of CuInS2 quantum dot powder is fully exposed, the band gap energy of CuInS2 quantum dot powder is about 1.53eV, when being irradiated, electron and hole pair can be generated, can promote the separation of photoinduced electron and hole to improve the activity of catalyst, and the dense carbon layer on CuInS2 quantum dot powder can form physical barrier to prevent peroxide from directly contacting with sulfur ion.

The invention relates to the technical field of chemical catalysts, in particular to a catalyst for preparing 2-tert-butylhydroquinone and a preparation method and application thereof.The catalyst comprises a hierarchical pore H beta molecular sieve, active metal is loaded in a framework of the hierarchical pore H beta molecular sieve, and the active metal is one or more of La, Ce and Zn. The catalyst adopts the hierarchical pore H beta molecular sieve as a skeleton, so that the diffusion limitation of the traditional microporous molecular sieve can be effectively broken through, and the occurrence of side reactions is reduced while the intrinsic rate of the reaction is greatly improved. La, Ce and Zn active metals are introduced into a hierarchical pore H beta molecular sieve framework to form a high-activity catalytic center synergistic system, and the reaction process is enhanced. Compared with the traditional liquid acid catalyst and ion exchange resin, the catalyst has the characteristics of simple process, easiness in recovery, no pollution, good high-temperature stability, high catalytic activity, good selectivity and low cost, and solves the core problems of low activity, heavy pollution and high cost of the traditional catalyst.

The invention discloses a method for synthesizing 4-hexene-3-one using zinc chloride as a catalyst, and belongs to the technical field of catalyst materials. The method optimizes reaction conditions, such as temperature and stirring speed, by reacting under a nitrogen environment to improve reaction efficiency and product yield. A specially designed loaded zinc chloride catalyst significantly improves catalytic performance through a combination of sepiolite, metal organic framework materials and molecular sieves. The preparation method of the catalyst includes phosphoric acid pretreatment, hydrothermal crystallization and calcination steps, ensuring its high specific surface area and thermal stability. Compared with the prior art, the present invention not only improves the yield and purity of 4-hexene-3-one, but also reduces production costs while reducing environmental impact.

The invention relates to a method for efficiently preparing an A-site Ba-containing proton conductor electrolyte by using a precursor combustion method, which innovatively adopts a technology for preparing electrolyte powder by using the precursor combustion method, is coupled with a flame synthesis technology and a sol-gel technology, and comprises the following steps: weighing raw materials according to the stoichiometric ratio of the proton conductor electrolyte, preparing precursor liquid, and preparing the A-site Ba-containing proton conductor electrolyte; adjusting the pH value of the precursor liquid, controlling the combustion condition, heating and drying the precursor liquid, combusting the obtained powder, and calcining at high temperature to form a corresponding crystal structure. Compared with the prior art, the preparation method has the advantages that the BCY, BZY, BZCY or BZCYYb electrolyte powder which is smaller and more uniform in particle size and higher in sintering activity is successfully prepared by controlling the chemical proportion and combustion conditions of the precursor. The electrolyte powder can be sintered to be compact at 1300 DEG C (the density is gt; and the temperature is far lower than 1600 DEG C required by the traditional method, so that the volatilization of Ba element in the high-temperature sintering and electrolyte densification processes is effectively avoided, and the battery performance and the sintering temperature are both considered.

The invention relates to the technical field of preparation of isopentenoic acid intermediates, in particular to a solid complex copper catalyst, preparation of the solid complex copper catalyst and application of the solid complex copper catalyst in synthesis of the isopentenoic acid intermediates. The catalyst is prepared by stirring a copper-based catalyst and organic amine at room temperature until the copper-based catalyst and the organic amine are completely dissolved; adding an adhesive and a carrier into the system, uniformly mixing, tabletting, and calcining to obtain a solid catalyst; wherein the copper-based catalyst accounts for 5%-10% of the mass of the whole catalyst. According to the preparation method, the solid complex copper catalyst and the fixed reaction bed are adopted, continuous synthesis is achieved, the reaction yield is increased by 90% or above, the whole reaction period is shortened by 60% or above, zero wastewater discharge is achieved through aftertreatment, the production cost is reduced, and the national requirements for energy and consumption reduction and green chemical engineering are met.

The invention discloses an MOF confinement precious metal composite material and a preparation method and application thereof.The preparation method comprises the steps that zircon salt and / or hafnium salt are / is dispersed in a mixed solvent of N, N-dimethylformamide and ethyl alcohol, and a metal salt solution is prepared; dispersing precious metal precursor powder in ethanol to prepare a precious metal precursor solution; and then uniformly mixing the metal salt solution with a noble metal solution, adding monobasic organic acid and 2-aminoterephthalic acid, and stirring for reaction to prepare the MOF confinement noble metal material. The catalyst is mild in preparation reaction condition, simple in process and high in yield, is suitable for efficiently catalyzing and purifying formaldehyde pollutants in air at normal temperature, and has a wide application prospect.

The invention discloses a preparation method of a Pt-K bimetallic molecular sieve catalyst. Specifically, tetrapropylammonium hydroxide, deionized water and tetraethyl orthosilicate are mixed at 25-30 DEG C, stirred for reaction to obtain a hydrogel, platinum nitrate, potassium nitrate and ethylenediamine solution are added into the deionized water, mixed to obtain a Pt-K precursor solution, slowly dripped into the hydrogel under ice-water bath ultrasonic conditions, the mixture is hydrothermally reacted at 150-180 DEG C for 24-72 hours, the reaction product is separated into a solid and a liquid, the solid is alternately washed with ethanol and deionized water with a volume concentration of 45-55% until the pH value of the washing solution is less than 8, and dried and roasted to obtain the catalyst. The preparation method of the catalyst is simple in process, high in catalytic activity and stable in catalytic performance, and the noble metal is stably applied in the chemical chain CH4 reforming coupled CO2 reduction reaction by in-situ synthesis and adding a co-catalyst, and the catalyst has good catalytic activity and stability.

The invention provides a preparation method of a catalytic material for selectively generating singlet oxygen by electrocatalytic activated water, the catalytic material and application, and belongs to the technical field of water treatment.The preparation method comprises the steps that Cr (NO3) 3.9 H2O, MnCl2. 4H2O and PVP are jointly dissolved in water and fully stirred, and a reaction solution is obtained; performing vacuum drying or freeze drying on the reaction liquid to obtain a mixture; calcining the mixture at 750 + / -5 DEG C for 1 + / -0.1 h in an inert atmosphere, and then calcining at 250 + / -5 DEG C for 2 + / -0.1 h to obtain a calcined product; and grinding the calcined product to obtain the catalytic material of 200 + / -5 meshes. The catalytic material prepared by the method can activate H2O in the presence of an external electric field to selectively generate < 1 > O2, so that efficient degradation of organic pollutants is realized, and the process does not cause excessive sulfate or residual organic matters to be introduced into water, so that the method is more environment-friendly and economical.

A method for recovering organic tin in a vinyl ether compound transesterification kettle liquid, comprising the following steps: 1) taking the vinyl ether compound transesterification kettle liquid, cooling to-10-40 DEG C, standing, until crystals are precipitated in the transesterification kettle liquid, filtering, or, cooling to-10-40 DEG C, adding 0.1-5% of organic tin powder in mass fraction to the transesterification kettle liquid, stirring and mixing uniformly, then standing, until crystals are precipitated in the transesterification kettle liquid, filtering; 2) adding a basic solution with a concentration of 5-8 wt% to the crystals obtained by filtering, in a mass ratio of 1:0.5-10, and heating to 25-60 DEG C, until flocculent substances appear on the surface of the basic solution, and filtering the lower aqueous phase; 3) washing the crystals obtained by filtering with water, then washing with an organic solvent, drying, to obtain organic tin. The process condition is mild and the operation is convenient, the recovered organic tin can be used repeatedly, the production cost of enterprises is reduced, and environmental pollution is avoided.

The invention provides an advanced oxidation method for treating a garbage membrane concentrated solution, which comprises the following steps: (1) adding quick lime into a garbage leachate concentrated solution, and then adding sodium carbonate for softening to obtain a softened solution; (2) adding a flocculating agent into the softened liquid, carrying out flocculent precipitation to obtain a flocculated liquid, and filtering the flocculated liquid to obtain a flocculated clear liquid; (3) adding hydrogen peroxide into the flocculated clear liquid, enabling the flocculated clear liquid to flow through three-dimensional electro-catalysis equipment from bottom to top, carrying out advanced oxidation to obtain oxidized liquid, and discharging effluent; the three-dimensional electro-catalysis equipment is a three-dimensional electrode reaction system formed by coupling a polar plate material with a catalyst, and the catalyst is a catalyst in which an active component is loaded by an alumina carrier. According to the treatment method disclosed by the invention, the leachate concentrated solution of the refuse landfill can be well treated, so that the removal rate of COD (Chemical Oxygen Demand) in the landfill leachate concentrated solution reaches 94% or above, the removal rate of total nitrogen reaches 93% or above, the hardness removal rate reaches 88% or above, and the removal rate of heavy metal ions reaches 94% or above.

The invention discloses a magnesium-based transition metal catalyst and a preparation method and application thereof.The magnesium-based transition metal catalyst which is environmentally friendly and high in catalytic activity is prepared with magnesium salt and transition metal (CoNiCu) salt as raw materials and hexamethylenetetramine or urea as an auxiliary through a simple one-step hydrothermal method. The method has good universality and operability; the magnesium-based transition metal catalyst can be used for activating persulfate to degrade organic pollutants, and has the effect of quickly and efficiently degrading the organic pollutants.

The invention relates to the technical field of composite catalysts, in particular to a preparation method of a conductive perovskite-molecular sieve composite catalyst for electrocatalytic purification of organic waste gas, which comprises the following steps: S1, directly mixing a rare earth salt, a transition metal salt, an alkaline earth salt, a complexing reagent and a small amount of deionized water according to a certain proportion, and stirring for a period of time to form sticky slurry, obtaining a mixture; and S2, directly putting the mixture in the step S1 into a muffle furnace for calcining, heating to a certain temperature at a certain heating rate, and maintaining for a period of time to obtain the conductive perovskite, and S3, ultrasonically dispersing a molecular sieve in a 70% ethanol solution, adding the conductive perovskite obtained in the step S2, stirring for a period of time, and drying to obtain the conductive perovskite-molecular sieve composite catalyst. The composite catalyst prepared by the preparation method disclosed by the invention has relatively high structural stability, relatively strong catalytic activity and relatively low operation temperature, and can promote efficient low-temperature degradation of VOCs (Volatile Organic Compounds).