1609results about How to "High catalytic activity" patented technology

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention discloses a preparation method and application of a zinc-manganese bimetal organic framework derived composite nano-enzyme, and belongs to the technical field of nano-materials. Zinc-manganese bimetal organic framework nanoparticles prepared by reacting ZIF-8 with manganese (III) acetylacetonate are used as a template, and are calcined at different temperatures in a tubular furnace to obtain zinc-manganese bimetal organic framework derivative composite nano-enzymes with different morphologies. The nano enzyme has peroxidase-like activity, glutathione peroxidase-like activity and catalase-like activity, and has a wide application prospect in anti-tumor treatment.

The invention discloses a molecular sieve confinement noble metal catalyst for CO-SCR denitration as well as a preparation method and application thereof, and belongs to the technical field of catalytic reduction of nitrogen oxides. The catalyst comprises a molecular sieve carrier and an Ir metal nanocluster loaded in the molecular sieve carrier through confinement encapsulation. The preparation method comprises the following steps: mixing a first metal precursor solution with a first ligand to obtain a first mixed solution; mixing a second metal precursor solution with a second ligand to obtain a second mixed solution; mixing a silicon source, an aluminum source, alkali and a solvent to obtain a molecular sieve precursor solution; and mixing the molecular sieve precursor solution with the first mixed solution, then adding the second mixed solution, carrying out a hydrothermal crystallization reaction, and then carrying out centrifugal washing, drying and calcining to obtain the catalyst. The catalyst has good stability, shows a high nitrogen oxide conversion rate in an atmosphere containing O2 and SO2, and improves the catalytic ability of the catalyst to nitrogen oxides under different conditions.

The invention discloses a CoFeCuMn LDH nanosheet, a confinement catalytic membrane and a preparation method of the CoFeCuMn LDH nanosheet. The preparation method of the CoFeCuMn LDH nanosheet comprises the steps that A1, cobalt salt, ferric salt, copper salt and manganese salt are dissolved in pure water according to a preset proportion to prepare a first solution, sodium hydroxide is dissolved in pure water to prepare a second solution, and sodium carbonate is dissolved in pure water to prepare a third solution; a2, adding the first solution and the second solution into the third solution, and stirring to obtain a mixed solution; a3, carrying out hydrothermal reaction on the mixed solution; a4, centrifugally washing the product obtained in the step A3 to obtain a precipitate; and A5, the sediment is dried, and the CoFeCuMn LDH nanosheet is obtained. According to the CoFeCuMn LDH nanosheet, the confinement catalytic membrane and the preparation methods of the CoFeCuMn LDH nanosheet and the confinement catalytic membrane, the degradation efficiency and the degradation rate of new pollutants are remarkably improved.

The invention belongs to the technical field of pyridone ethanolamine salt synthesis, and discloses an environment-friendly pyridone ethanolamine salt preparation process which comprises the following preparation steps: enabling isononanoyl chloride and 3, 3-methyl dimethacrylate to react under the catalysis of a solid acid catalyst to prepare 3, 7, 9, 9-tetramethyl-2-decene-5-keto acid methyl ester, and enabling the 3, 7, 9, 9-tetramethyl-2-decene-5-keto acid methyl ester to react under the catalysis of a solid acid catalyst to prepare 3, 7, 9, 9-tetramethyl-2-decene-5-keto acid methyl ester. The preparation method of the solid acid catalyst comprises the following steps: S1, taking water as a solvent, adding 14-16 parts by weight of zirconium oxychloride, 1-3 parts by weight of titanium sulfate, 0.1-0.5 part by weight of chloroplatinic acid and 0.05-0.4 part by weight of cerium chloride, adjusting the pH value to 10-11, and aging to obtain a precipitate; s2, roasting the precipitate obtained in the step S1 in an air atmosphere at 500-600 DEG C to obtain a solid acid catalyst; the method has the advantages that the catalyst is easy to recycle, and the reusability is high.

The invention belongs to the field of bioengineering, and particularly discloses a glutamate oxidase mutant with improved enzymatic activity. According to the invention, site-specific mutagenesis and saturation mutation are carried out on glutamate oxidase coding genes derived from streptomyces mobaraensis, wherein mutations are C536R, P532R, Q378D, V548E and G236D. After the mutant obtained by the invention is induced and purified, the specific enzyme activity of the optimal glutamate oxidase mutant is 1.69 U / mg and is improved by about 30% compared with that of wild bacteria, which shows that the 378-site amino acid residue has great influence on the catalytic action and stability of the enzyme. In addition, the invention also discloses a construction method of the glutamate oxidase mutant with improved enzymatic activity and application of the glutamate oxidase mutant in production of amino acid derivatives such as alpha-ketoglutaric acid. Therefore, the beneficial mutant provided by the invention can lay a good foundation for industrial fermentation production of alpha-ketoglutaric acid and other products.

The invention belongs to the technical field of biology, and particularly provides a reverse transcriptase UCRT v6 mutant with improved thermal stability, the reverse transcriptase UCRT v6 mutant comprises four single-point mutants, six double mutants and four three-point mutants, and compared with wild type reverse transcriptase UCRT v6, the half-life period of the mutant is longer at 65 DEG C; the three mutants are better in effect, and the half-life period of the three mutants is about 5 times that of the wild reverse transcriptase UCRT v6. The invention also provides a genetically engineered bacterium containing the mutant. The reverse transcriptase UCRT v6 mutant obtained by the construction method provided by the invention has better thermal stability, shows higher thermal stability when being used for reverse transcription of RNA (Ribonucleic Acid) into cDNA (Complementary Deoxyribonucleic Acid) at higher temperature, and has higher application potential.

The invention belongs to the technical field of biology, and particularly provides UCRT VI heat-resistant reverse transcriptase mutants with improved thermal stability, the mutants comprise four single-point mutants, six double mutants and four three mutants, and compared with wild-type UCRT VI heat-resistant reverse transcriptase, the mutants have longer half-life period at 65 DEG C; the double mutant has a better effect, and the half-life period of the double mutant is about three times of that of wild type DNA polymerase. The invention also provides a genetically engineered bacterium containing the mutant. The UCRT heat-resistant reverse transcriptase mutant obtained by the construction method provided by the invention has better thermal stability, shows higher thermal stability when being used for synthesizing DNA (Deoxyribonucleic Acid) by reverse transcription at higher temperature, and has higher application potential.

The invention relates to the technical field of ozone catalysts, in particular to an iron-manganese bimetallic ozone catalyst as well as a preparation method and application thereof. The iron-manganese bimetallic ozone catalyst comprises an activated carbon carrier and an iron-manganese bimetallic oxide loaded on the activated carbon carrier, in the preparation process of the iron-manganese double-metal ozone oxidizing agent, anhydrous nitrate of ferric iron and divalent manganese is adopted and dissolved in absolute ethyl alcohol, then activated carbon is added for excessive dipping, drying and under-pressure calcination, and the iron-manganese double-metal ozone oxidizing agent can be obtained. When the ferro-manganese bimetallic ozone oxidizing agent is combined with ozone to remove refractory COD (Chemical Oxygen Demand) in advanced sewage treatment, the ferro-manganese bimetallic ozone oxidizing agent shows relatively good catalytic activity, the removal rate of the refractory COD in the advanced sewage treatment can reach 57.9 percent within 60 minutes, and the ferro-manganese bimetallic ozone oxidizing agent has a wide application prospect.

The invention belongs to the technical field of medical materials, discloses hyaluronic acid modified phosphorus-doped double-copper monatomic nano-enzyme (Cu2 / PNC at HA) and a preparation method and application thereof, and aims to solve the problems of low catalytic efficiency and poor selectivity of nano-enzyme. The preparation method comprises the following steps: firstly synthesizing a ZIF-8 carrier, then coating double copper ions and poly (cyclotriphosphoryl-4 ', 4'-diaminodiphenyl ether) (PZM) on the surface of the ZIF-8 through polymerization, and further performing pyrolysis to obtain the Cu2 / PNC nano-enzyme. The catalytic efficiency of the Cu2 / PNC nano-enzyme is remarkably improved through the phosphorus doping effect and double copper single atoms. The hyaluronic acid is adopted to coat the Cu2 / PNC nano-enzyme, so that the biocompatibility is improved, the anti-tumor activity is remarkably improved, the application of the Cu2 / PNC nano-enzyme in the field of biomedicine is expanded, and the huge potential in the aspect of tumor catalytic treatment is shown.

The invention discloses a preparation method and application of a carbon dioxide gas capture functional molecule modified nanogold catalyst. The preparation method comprises the following steps: synthesizing a modified molecule with a carbon dioxide gas capturing function through a chemical reaction; adding the modified molecules into an organic solvent, and uniformly mixing to obtain a solution; then adding a nanogold colloidal solution into the solution, uniformly stirring, and carrying out oil bath heating reaction; and after the reaction is completed, cooling to room temperature, carrying out suction filtration on the reaction liquid, respectively washing with ethanol and deionized water, and carrying out vacuum drying on the product to obtain the carbon dioxide gas capture functional molecule modified nanogold catalyst. In the electrocatalytic carbon dioxide reduction reaction process of the obtained catalyst, modification molecules are connected with the nanogold catalyst through chemical bonds, active sites of the nanogold catalyst are exposed, and meanwhile, an interface environment beneficial to the carbon dioxide reduction reaction can be provided; therefore, high activity, high selectivity and high stability of the molecular modified nanogold catalyst are realized.

The invention provides a supported IrOx catalyst as well as a preparation method and application thereof. The supported IrOx catalyst comprises an oxide carrier and an active component supported on the carrier, the active component comprises an Ir elementary substance and amorphous IrOx coated on the surface of the Ir elementary substance; and the crystal structure of the IrOx is long-range disordered and short-range ordered. The preparation method of the supported IrOx catalyst is convenient to implement, high in reproducibility and beneficial to industrial preparation and production, gram-level batch preparation can be achieved under the laboratory condition, and possibility is provided for large-scale preparation of the low-cost, high-activity and high-stability proton exchange membrane water electrolysis hydrogen production anode catalyst.

The invention belongs to the field of material preparation and chemical engineering, and particularly relates to an N-doped modified MOFs (Metal-Organic Frameworks) derived core-shell nanoreactor as well as a preparation method and application thereof. The preparation method comprises the following steps: taking cobalt as a node metal, synthesizing an N-doped modified MOFs material with an organic ligand and a nitrogen source through a hydrothermal reaction, then coating the surface of the material with porous silicon dioxide, and preparing the N-doped modified MOFs derived core-shell nanoreactor through a two-step calcination method. The MOFs derived core-shell nanoreactor prepared by the invention has a large specific surface area, a rich pore structure and excellent catalytic activity and stability, and is high in catalytic activity, good in recycling stability and suitable for large-scale popularization and application when being used as a catalyst for alpha, beta-unsaturated aldehyde transfer hydrogenation.

The invention provides a carbon quantum dot-ferric oxide nano composite material as well as a preparation method and application thereof. The composite material is prepared by the following steps: S1, mixing a ferrous sulfate solution with an imidazole methanol solution, and performing ultrasonic treatment to obtain a zeolite imidazate skeleton structure material containing an iron core; s2, calcining the zeolite imidazate skeleton structure material in an environment with a temperature range of 200-700 DEG C and oxygen partial pressure of 5-40% to obtain iron oxide with a complex frame structure; s3, synthesizing graphene carbon quantum dots with the size of 5-8 nm by adopting a trinitrophenol method; s4, the carbon quantum dots and ferric oxide powder are mixed and then evenly ground in a ball mill, the ball milling time is 60-240 min, the content of the added graphene carbon quantum dots is 0.5-3 wt%, and a carbon quantum dot-ferric oxide nanocomposite is obtained; according to the method, ferric oxide with a complex framework is compounded with the graphene carbon quantum dots, so that indoor VOCs can be oxidized at room temperature.

The invention relates to the technical field of supported metallocene catalysts, in particular to a supported metallocene catalyst additive as well as a preparation method and application thereof. The supported metallocene catalyst additive has the following structure: # imgabs0 #, R is selected from C1-C10 alkyl groups, R1 and R3 are selected from alkyl groups and adamantyl groups and are located at ortho-para positions of-OH, R2 is selected from C1-C10 alkyl groups and cycloalkyl groups, and R'is selected from alkyl groups. The additive can greatly retain the catalytic activity and copolymerization performance of a metallocene catalyst, improve the metal loading capacity and catalytic activity, and reduce the dosage of a traditional cocatalyst MAO.

The invention discloses a method for preparing a high-entropy spinel type oxide material through microwave hydrothermal treatment and a product and application of the high-entropy spinel type oxide material, and belongs to the technical field of material science and chemical engineering.The method comprises the following steps that six metal sources of iron, cobalt, nickel, chromium, zinc and copper are dissolved in water according to the metal ion equimolar ratio and stirred to be uniform, and a mixed solution is obtained; adding a precipitator into the mixed solution, and then sequentially carrying out microwave hydrothermal treatment, cooling, washing, centrifuging, drying and calcining treatment to obtain the high-entropy spinel type oxide material (FeCoNiCrZnCu) 3O4. According to the invention, the spinel type oxide is subjected to high-entropy design, and the high-entropy spinel material with excellent water electrolysis catalytic performance is synthesized. On one hand, the raw material for synthesizing the material is relatively cheap transition metal nitrate, the source is wide, and the cost is low; and on the other hand, the microwave hydrothermal method can efficiently synthesize the high-entropy spinel material under mild reaction conditions, and has the characteristics of greenness and environmental protection.

The invention discloses an electrocatalyst material for in-situ production of hydrogen peroxide through oxygen reduction as well as a preparation method and application of the electrocatalyst material, and belongs to the field of organic wastewater treatment. MoS2 / Fe porous conductive particles and a high-molecular polymer are adopted as main components, and ethanedioate and polyacrylamide are combined as a dispersion auxiliary solvent and a pore-forming agent to form a three-dimensional composite conductive catalyst material; through ultralow-temperature freeze drying and microwave radiation technologies, the material structure is optimized, the catalytic reaction active sites are improved, and efficient electrocatalytic oxygen reduction for in-situ production of hydrogen peroxide is realized; the MoS2 / Fe porous conductive particles not only optimize the performance of the catalyst, but also realize high-valued utilization of solid wastes; the electrocatalyst material has excellent conductivity, catalytic activity and organic wastewater degradation capability, is stable in removal effect before and after use, can be repeatedly used for multiple times, reduces the use cost, and provides a wide application prospect for the fields of environmental protection, energy and the like.

The invention provides aluminum-doped hematite, a preparation method of the aluminum-doped hematite and application of the aluminum-doped hematite in catalyzing peroxides to degrade organic pollutants or remove pathogenic bacteria. The preparation method of the aluminum-doped hematite comprises the following steps: adding ferric iron salt and aluminum salt into deionized water, reacting, precipitating to separate out a product, washing, drying and grinding to obtain a precursor; calcining the precursor, and then washing and drying to obtain the aluminum-doped hematite. The preparation method is simple, cheap and easily available in raw materials, low in cost, green, safe and environment-friendly; the aluminum element is introduced into the hematite, so that the catalytic activity of the hematite is improved, and the catalytic condition is easy to realize; the aluminum-doped hematite disclosed by the invention has excellent capability of activating peroxide, so that the aluminum-doped hematite shows excellent performance in the aspects of removing environmental organic pollutants and sterilizing.

The invention discloses a carbon dioxide hydrogenation methanation-cracking carbon preparation series method, which comprises the following steps: generating CH4 through a reaction of # imgabs0 # imgabs1 #, and realizing the production of a carbon material by adopting the technologies of condensation separation of CH4 and water vapor, CH4 cracking reaction of # imgabs2 #, cyclic utilization of hydrogen and the like. The process is composed of a carbon dioxide hydrogenation methanation reactor and a methane cracking reactor. In the methanation reactor, CO2 and H2 react under a low-temperature condition to generate CH4 and water vapor; cH4 and water vapor are separated by adopting a compressor condensation separation technology, and the separated CH4 is conveyed to a cracking reactor. In the methane cracking reactor, CH4 is cracked at a high temperature to generate H2 and a carbon nanomaterial, and then H2 is returned to the methanation reactor again. The separation of CH4 and water vapor at a relatively low temperature is realized in the tandem carbonization process through a low-temperature condensation technology; through low-temperature CO2 methanation and CH4 catalytic cracking, the content of CO2 is reduced, a high-quality carbon nanomaterial is obtained, and cyclic utilization of CO2 and H2 is realized.

The invention discloses preparation of a monatomic graphene type photo-thermal catalyst and application of the monatomic graphene type photo-thermal catalyst in catalyzing aldose to produce ketose, and the preparation comprises the following steps: loading a monatomic precursor (X) on a graphene type carbon material (GT) by adopting a solution impregnation method, further reducing the monatomic precursor into a corresponding monatomic (Y) by adopting a continuous oxidation-reduction method, the monatomic graphene type photo-thermal catalyst is obtained, and the monatomic graphene type photo-thermal catalyst is expressed as Ysg / GT. The catalyst is used for catalyzing other different aldoses (maltose, glyceraldehyde, erythritol and xylose) to produce corresponding ketose, the catalyst shows good catalytic activity and photo-thermal performance, and the ketose yield is larger than 50%. Finally, in the reusability research of the catalyst, the catalyst is found to have good activity and structural stability, the chemical equilibrium limit of the reversible reaction is broken through, the reaction rate is increased, and the catalyst can help to develop an efficient and green catalyst to open up a new way for the reversible reaction process.

The invention discloses preparation and application of an imido covalent organic framework material containing imidazolyl ionic liquid. The imido covalent organic framework material (ILs-TPN-COFs) containing the imidazolyl ionic liquid is obtained by connecting the imidazolyl ionic liquid [CnCmILs (at) Br] to an imido covalent organic framework TPN-COFs through a covalent bond. The material has an ionic liquid tertiary amine N active site and a halogen anion active site, and can promote CO2 activation and ring opening of epoxide. The ILs-TPN-COFs catalytic material has the advantages of uniform distribution of active sites, better stability, easiness in separation of the catalyst from a reaction system, better repeatability and the like. According to the invention, the prepared novel ILs-TPN-COFs material is applied to catalysis of synthesis of propylene carbonate from carbon dioxide and epoxypropane, and shows excellent catalytic performance under mild reaction conditions.

The invention relates to the field of biochemical engineering, in particular to an alcohol dehydrogenase mutant and application thereof. The mutant is obtained by mutating alcohol dehydrogenase with an amino acid sequence encoding SEQ ID NO: 4 at one or more sites selected from 62nd, 108th, 130th, 132, 134, 182nd, 206th, 287th, 303th, 313th and 314, and the mutation is that the amino acid at the site is mutated into one of A, G, V, L, I, P, F, Y, W, S, T, C, M, N, Q, D, E, K, R and H. According to the alcohol dehydrogenase mutant and the application of the alcohol dehydrogenase mutant, the feeding amount of substrates is increased; the high conversion rate (gt; 99%) of the substrate is realized; according to the present invention, the new YqjM has the good product ee value (gt; 98%), and it is determined that the YqjM derived from the bacillus subtilis old yellow enzyme (belonging to ketene reductase) has the optimal catalytic activity, such that the good industrial application performance is provided.

The invention relates to the technical field of hydrogen storage, in particular to a hydrogen storage nano composite material, the composition of the hydrogen storage nano composite material is Tix (LaaCebMgc) 2-x (FedCoeMnf) y, x is larger than or equal to 1 and smaller than or equal to 1.5, y is larger than or equal to 1 and smaller than or equal to 1.5, the sum of a + b + c is larger than or equal to 1 and smaller than or equal to 1.2, c is larger than or equal to 0.5, the sum of d + e + f is larger than or equal to 1 and smaller than or equal to 1.05, and f is larger than or equal to 0.5. Comprising an equipment body, supporting carrier plates are symmetrically and fixedly arranged on the two sides of the equipment body, supporting bottom rings are fixedly arranged at the lower ends of the supporting carrier plates, a feeding pipe is fixedly arranged at the upper end of the equipment body, and a discharging bottom opening is formed in the lower side of one end of the equipment body; and a fixed material receiving plate is fixedly arranged in the position, corresponding to the discharging bottom opening, of the interior of the equipment body, a plurality of upper discharging openings are formed in the positions, on the upper side of the discharging bottom opening, of the equipment body, and the invention further relates to a preparation method of the hydrogen storage nano composite material, and the preparation method is used for producing the hydrogen storage nano composite material.

The invention discloses a preparation method of a platinum-carbon catalyst and the platinum-carbon catalyst, and the method comprises the following steps: pretreating a carbon carrier to obtain a target carbon carrier; carrying out platinum loading on the target carbon carrier by adopting a platinum precursor to obtain an initial platinum-carbon catalyst; dipping the initial platinum-carbon catalyst in the amino compound solution to obtain a dipping mixture; the concentration of the amino compound solution is 0.1-10 mmol / L; carrying out ultrasonic treatment on the impregnated mixture for 20-30 minutes at room temperature to obtain an intermediate platinum-carbon catalyst; and carrying out vacuum drying on the intermediate platinum-carbon catalyst at 60-80 DEG C for 8-16 hours to obtain the platinum-carbon catalyst. The amino compound solution is used for modifying the catalyst, the interaction between platinum particles and an oxygen-containing intermediate in the oxygen reduction process is weakened, and the catalytic activity of the platinum-carbon catalyst is improved.

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 an additive for improving the octane number of propylene and gasoline as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation and application. The additive for improving the octane number of propylene and gasoline comprises 20-65% of a regular ZSM-5 molecular sieve, 0-25% of other molecular sieves, 3-30% of P2O5, 3-18% of a binder and the balance of clay, wherein the total percentage is 100%. The specific surface area of the regular ZSM-5 molecular sieve is 300-510 m < 2 > / g, the micropore volume is 0.20-0.42 mL / g, the mesopore volume is 0.10-0.27 mL / g, the grain size is 30-300 nm, and the silica-alumina ratio is 20-180. The regular ZSM-5 molecular sieve prepared without the template agent is high in yield, high in crystallinity, excellent in acid property and open in pore structure. The additive for improving the octane number of the propylene and the gasoline contains a regular ZSM-5 molecular sieve and is subjected to phosphorus compound modification, so that the catalytic activity and the shape-selective cracking capability are synchronously improved, the cracking capability of low-octane number alkane components is improved, the propylene yield and the octane number of the gasoline are greatly improved, and the manufacturing cost is effectively reduced.

The invention belongs to the field of biological pharmacy and biological conversion, and particularly relates to a lipase mutant and application thereof. The lipase CALB mutant disclosed by the invention is obtained by carrying out single-point mutation or combined mutation on the 40th site, the 134 site, the 154 site, the 189th site, the 278th site and the 281 site of an amino acid sequence as shown in SEQ ID NO.1. Compared with a wild type, the mutant has the advantage that the stereoselectivity is greatly improved when the mutant is used for catalyzing racemization 3-cyclohexene-1-methyl formate to produce (S)-3-cyclohexene-1-formic acid. Compared with a traditional chemical method for preparing (S)-3-cyclohexene-1-formic acid, the lipase CALB mutant provided by the invention is high in stereoselectivity, mild in reaction condition, environment-friendly, low in equipment requirement, capable of greatly reducing the production cost and wide in application prospect in industrial application.

The invention discloses a fuel cell rapid activation method, and relates to the technical field of fuel cells, and the activation method comprises the steps of early-stage preparation, electrode pretreatment, activation reagent injection, activation treatment, post-treatment and evaluation and optimization. The method has the advantages that the electrochemical impedance spectrometer is used for state inspection of the electrode and other components in the electrode pretreatment stage, the reliability of the fuel cell to be detected is ensured, the surface of the electrode is deeply cleaned through the cleaning agent and the ultrasonic cleaning machine, dust, oil stains and impurities on the surface of the electrode can be effectively removed, and the detection accuracy is improved. Meanwhile, the microstructure and chemical composition of the surface of the electrode are improved by utilizing a plasma technology, and the catalytic activity and corrosion resistance of the electrode are improved, so that the activation efficiency and the operation stability of the fuel cell are improved, and potential abnormities can be found and treated in time by evaluating the performance in real time; and the fuel cell is ensured to operate in an optimal state.

The invention relates to the field of catalysts, and discloses a nitrile rubber hydrogenation catalyst and a preparation method and application thereof.The nitrile rubber hydrogenation catalyst comprises a carrier and an active metal component loaded on the carrier, and the carrier comprises a composite metal oxide and silicon dioxide; wherein the composite metal oxide is M < 1-x > Al < x > O (x + 2) / 2, x is 0.1-0.4, and M is selected from at least one of Mg, Ni and Zn; wherein the active metal component is Os; wherein in terms of metal elements, the content of the active metal component is 0.01-5wt% on the basis of the total weight of the catalyst. The catalyst provided by the invention is used for preparing hydrogenated butadiene-acrylonitrile rubber by hydrogenation of butadiene-acrylonitrile rubber, and has high selectivity and hydrogenation degree.

The invention relates to a preparation method and application of a covalent organic framework material capable of adsorbing sulfonamide antibiotics. The method comprises the following steps: S1, respectively putting an amino-containing monomer and an aldehyde-containing monomer into a glass tube to obtain a mixture, then adding a solvent, performing ultrasonic uniform mixing, then adding an acetic acid solution for catalytic reaction, and performing uniform mixing to obtain a mixed solution; s2, freezing the mixed solution with liquid nitrogen, then circularly vacuumizing, sealing a glass tube, drying after treatment, cooling to room temperature, and filtering and washing to obtain a precipitate; and S3, carrying out Soxhlet extraction, repeatedly washing, and putting into a vacuum oven to obtain a product, namely the covalent organic framework material capable of adsorbing the sulfonamide antibiotics. According to the application, the adsorbent is applied to adsorption of sulfonamide antibiotics in water. The novel covalent organic framework material prepared by the invention is used for removing low-concentration sulfonamide antibiotics for the first time, and is considered as an excellent adsorption material capable of reducing the risk of water quality and guaranteeing the health of water quality.