24results about How to "Reduce inactivation" patented technology

The invention discloses a bifunctional composite catalyst for preparing aviation kerosene through direct hydrogenation of carbon dioxide. The bifunctional composite catalyst is prepared from the H-ZSM-5 zeolite molecular sieve and a composite metal oxide InZnZrOx. Wherein the H-ZSM-5 zeolite molecular sieve is obtained by an inventor through a hydrothermal method, the appearance, the acid strength and the acid amount of the molecular sieve can be accurately controlled through the method, a hierarchical pore structure in a pore channel can be increased, and the selectivity of aviation kerosene components can be well improved; the problems that the diffusion of the heavy carbon aromatic hydrocarbon product in the pore channel of the zeolite molecular sieve is blocked, so that the catalyst is easy to deposit carbon, and the acidic site is covered are solved to a great extent; the composite metal oxide InZnZrOx can be prepared through flexible and efficient coprecipitation, and the problems that in an InZnZrOx / flaky hierarchical pore H-ZSM-5 molecular sieve difunctional composite catalyst, the metal oxide dispersity is low, and the catalytic activity is low are solved.

The invention relates to the field of catalysts, in particular to a copper-based catalyst and a preparation method and application thereof.The preparation method comprises the following steps that S1, a first solution containing a zinc source and an aluminum source and an alkaline precipitator solution are subjected to first mixing to obtain turbid liquid; carrying out second mixing on the turbid liquid, a second solution containing a copper source and the alkaline precipitant solution to obtain a mixed material; s2, carrying out aging treatment on the mixed material to obtain aged slurry; s3, washing the aged slurry, and then carrying out drying treatment and roasting treatment; wherein the second solution also contains a coupling agent and a metal additive; the coupling agent comprises a titanate coupling agent; the metal additive contains a first metal element, and the first metal element is selected from at least one of an IIA group element, an IVB group element and a VIB group element. The copper-based catalyst provided by the invention can significantly improve the yield of methanol in a reaction for preparing methanol by hydrogenation of carbon dioxide.

The invention relates to the technical field of semiconductor manufacturing, and discloses a base material processing system which comprises a reaction cavity, an air inlet and an air outlet are formed in the cavity wall of the reaction cavity, the air inlet is located in the side of a to-be-cleaned area, and the base material processing system further comprises an air conveying structure and an air exhaust structure. The gas transmission structure comprises a first gas transmission end and a second gas transmission end which can switch gas transmission; wherein the first gas transmission end is used for being communicated with a gas inlet of a reaction cavity; the air exhaust structure is used for being communicated with an air outlet of the reaction cavity, and the second air conveying end of the air conveying structure is communicated with the air exhaust structure; wherein the first gas transmission end can be communicated with the gas inlet of the reaction cavity through switching between the first gas transmission end and the second gas transmission end of the gas transmission structure; or the second gas transmission end is communicated with the gas extraction structure. Therefore, the residue in the reaction cavity can be effectively removed, and the influence on the process reaction is reduced, so that the yield of products is effectively improved. The invention further discloses semiconductor coating equipment.

The invention discloses a method for recycling waste strawberry substrates, comprising the steps of: exposing cultivated waste strawberry substrates to the sun for 6-30 days between June and July each year, taking the waste strawberry substrates after exposure to the sun and mixing them with organic fertilizers in different proportions to form fresh strawberry substrates, planting, and obtaining waste strawberry substrates after planting and harvesting, and then exposing them to the sun. The invention optimizes the inoculation time and method of composting strains according to the characteristics of the composting stage, invents a step-by-step inoculation method, inoculates different strains at different stages, can reduce the loss of nutrients in the high-temperature stage of composting, and improve the quality of compost; and can reduce the antagonism between different strains, improve the activity of biocontrol bacteria, thereby facilitating the recycling of elevated strawberry substrates.

The invention relates to an electronic-grade acetic ether production method and device based on reactive distillation-dividing wall tower distillation reinforcement. The device is composed of a reactive distillation system, an alcohol ester recovery tower system, an acetic ether concentration system and an acetic ether refining dividing wall tower system. An esterification reactor of the reactive distillation system adopts strong acid ion exchange resin as a catalyst; the contents of acetic acid and ethanol in the acetic ether reaction liquid are controlled by feeding fresh ethanol and acetic acid in a reactive distillation system; and crude ethyl acetate from which water and ethanol are removed by the ethyl acetate concentration tower is subjected to light component removal and heavy component removal by an ethyl acetate refining dividing wall tower to obtain an electronic-grade ethyl acetate product. The product purity is extremely high and stable, the whole set of process is designed for obtaining electronic-grade products, the final product purity stably reaches 99.99% or above, and the requirements of the high-end electronic chemical market are met. A dividing wall tower technology is adopted, light component removal and heavy component removal processes are integrated in a single tower, the number of devices and the occupied area are reduced, and energy is saved by 20%-30% compared with a traditional process.

The invention relates to a cluster and monatomic double-active-site hydrogenation catalyst as well as a preparation method and application thereof. The hydrogenation catalyst comprises a carrier and active components loaded on the carrier, the carrier is a defective carbon carrier; the active component comprises palladium or ruthenium; the active components are uniformly dispersed on the carrier in the form of clusters and single atoms. The hydrogenation catalyst carrier prepared by the invention is high in specific surface area, contains rich nitrogen active sites, defect sites and alkaline sites, and can form coordination with active components, so that the active components form atomic-scale dispersion and high-dispersion clusters on the surface of the carrier, and efficient utilization of the active components is realized; moreover, the reaction can be performed at relatively mild temperature and pressure, so that high conversion rate of nitro-aromatic hydrogenation and high selectivity of corresponding alicyclic amine are realized, an alkaline auxiliary agent is not introduced, and the stability of the catalyst is improved.

The present invention relates to the technical field of methacrylate synthesis, and specifically discloses a molecular sieve catalyst for methacrylate synthesis and a preparation method thereof. The above-mentioned catalyst preparation method includes: adding type A microporous molecular sieve to anhydrous ethanol and ultrasonically treating at room temperature for 1-2h, adding ethylenediamine, stirring at 50-70°C for 1-2h, and removing anhydrous ethanol by rotary evaporation to obtain a pre-treated molecular sieve; adding the pre-treated molecular sieve, yttrium nitrate, and tetraethyl orthosilicate to an ethanol aqueous solution and stirring evenly, adjusting the system pH value to 8-9, 80-90°C insulation for 5-10h, cooling to room temperature, washing, and vacuum drying to obtain a composite molecular sieve; calcining the composite molecular sieve at 300-500°C for 2-4h, cooling to room temperature, adding to water, adding zirconium nitrate, cesium nitrate, and graphene oxide for ultrasonic treatment for 5-10h, standing for 5-10h, 160-190°C hydrothermal reaction for 2-6h, cooling to room temperature, filtering, washing, and vacuum drying.

The invention belongs to the technical field of veterinary instruments, and particularly relates to a clinical vaccination auxiliary device and method for veterinarians, the clinical vaccination auxiliary device comprises a vaccination gun and a needle tube mounted at the end of the vaccination gun, the vaccination gun is provided with a bottle seat for placing a vaccine bottle, and the bottle seat is provided with a puncture needle for puncturing the vaccine bottle; the adjusting mechanism comprises a sleeve disc which is fixedly arranged on the vaccination gun in a sleeving manner, and a connecting frame with a sliding plate is fixedly mounted on the sleeve disc; through the design of a connecting frame, a sliding plate, an adjusting plate and an adjusting groove, the length of the needle tube entering the poultry body is controllable, and the length of the needle tube penetrating into the poultry body is rapidly adjusted according to the actual requirements of different poultry. Therefore, the device adapts to the body types, day ages, fat and thin degrees and injection site differences of different poultry, and avoids the situations that vaccines cannot be effectively absorbed and immune fails due to too shallow needle insertion, or internal organs, blood vessels and nerves are damaged due to too deep needle insertion, and stress and tissue damage of the poultry is aggravated.

The invention belongs to the technical field of seawater fuel cell power generation, and particularly relates to a water circulation fuel cell power system based on seawater hydrogen production and a ship. Comprising a seawater pretreatment unit used for receiving seawater and removing impurities in the seawater; the fuel supply and mixing unit is connected with the seawater pretreatment unit and is used for mixing NaBH4 and seawater to form hydrogen fuel; the hydrogen fuel cell unit is connected with the fuel supplying and mixing unit and is used for generating hydrogen through hydrolysis reaction, converting the hydrogen into direct current and generating circulating water; the circulating unit is respectively connected with the hydrogen fuel cell unit and the fuel supplying and mixing unit and is used for feeding circulating water into the fuel supplying and mixing unit; and the power unit is connected with the hydrogen fuel cell unit and used for providing power for the ship. The seawater directly participates in the hydrolysis reaction of the sodium borohydride to start the system, and the water generated by the fuel cell is recycled, so that a'water-hydrogen-electricity 'closed loop is realized, and the energy density and the space utilization rate of the ship are improved.

This invention discloses a piezoelectric self-renewing gradient ceramic catalytic membrane and its preparation method, belonging to the field of porous ceramic technology. The method includes the preparation of a porous piezoelectric ceramic substrate, LDH transition layer modification, and catalyst electrophoretic deposition. The catalyst electrophoretic deposition method involves dispersing the catalyst in a solvent, adjusting the suspension to make the catalyst particle surface positively charged, obtaining a catalyst suspension; using a ceramic substrate modified with a positively charged transition layer as the cathode and a graphite rod as the anode, immersing both electrodes in the catalyst suspension, controlling the distance between the two electrodes to 1.4-1.6 cm, connecting a constant voltage DC power supply of 20-40V, and depositing for 5-15 minutes. After deposition, the sample is removed and subjected to post-processing and polarization treatment to obtain the catalytic ceramic membrane product. This invention utilizes fluid pressure fluctuations to excite the piezoelectric effect, achieving in-situ mechanical exfoliation and self-renewal of catalytically activated and surface-deactivated catalysts, significantly improving catalytic efficiency and long-term stability.

The application discloses a method for preparing L-serine by enzyme catalysis, and in-situ preparation of low-cost and high-activity THF is achieved by using a biological method or a chemical method; THF and enzyme inactivation are avoided by precisely controlling the flow addition of formaldehyde; the reaction system is optimized to promote the in-vivo circulation regeneration of THF, so that higher conversion efficiency is achieved with less THF feeding amount, and the use amount and cost of the expensive coenzyme THF are significantly reduced. The method is based on the optimization of the existing enzyme process, does not need complex equipment modification, and is easy to realize industrialized scale production.

The invention provides a Ni-doped rare earth metal type nano oxide as well as a preparation method and application thereof. According to the preparation method, the rare earth metal source and the Ni source are directly mixed, then the precursor is prepared, reduction is carried out, in the obtained nano oxide, Ni shows atomic-scale dispersion and mainly shows Ni < 2 + >, and rich, evenly-distributed and stable Ni-O active sites can be constructed. Besides, by the adoption of the method, the content of the Ni element in the Ni-doped rare earth metal type nano oxide can reach about 10 wt% and is far higher than the level in the prior art. In addition, according to the preparation method, synthesis raw materials are easy to obtain, the method is simple, convenient and short in time consumption, and large-scale production is easy to achieve. Tests show that the Ni-doped rare earth metal type nano oxide has excellent photo-thermal catalytic activity.

The invention relates to a method for producing high-performance spaceflight fuel base oil with high yield through kerosene co-hydrogenation, which comprises the following steps: mixing catalytic slurry oil, a catalyst A and pulverized coal, introducing into a micro-scale hydrogen mixer, mixing with hydrogen, and carrying out rapid hydrocracking reaction to obtain a rapid hydrocracking product; mixing a catalyst B and anthracene oil, mixing the mixture with the rapid hydrocracking product, carrying out a deep hydrocracking reaction to obtain a deep hydrocracking product, and separating to obtain a light hydrocracking product and a heavy hydrocracking product; the heavy hydrocracking product firstly passes through a hot low-pressure separator, a vacuum tower and fractionation to obtain vacuum wax oil and tailings, the vacuum wax oil and the light hydrocracking product are mixed and then mixed with hydrogen, a hydro-upgrading reaction is performed, and a hydro-upgrading product is obtained; and carrying out a hydroisomerization reaction on the hydro-upgrading product to obtain a hydroisomerization product, and separating to obtain naphtha, aerospace fuel base oil, a heavy diesel oil component and a wax oil component. According to the invention, efficient and stable deep conversion of kerosene co-hydrogenation is realized.

The invention belongs to the field of preparation of aviation kerosene from biomass, and particularly relates to a process for efficiently synthesizing a biological aviation kerosene precursor and a catalyst regeneration method. According to the method, 2-methyl furan (2-MF) and ketone compounds (cyclohexanone, methyl isobutyl ketone and acetone) are dehydrated to efficiently synthesize the C13 or C16 biological aviation kerosene precursor (BAKP), and the C13 or C16 biological aviation kerosene precursor (BAKP) is synthesized by regulating and controlling the concentration of small molecule ketone substances in reaction raw materials, the reaction temperature and the use amount of a catalyst. The problem that the yield of BAKP is low due to side reaction caused by hydrolysis ring opening of 2-MF at present is solved; according to the invention, BAKP is prevented from being hydrolyzed into ketone to initiate polymerization reaction, the blockage of catalyst pore channels is relieved, and the deactivation rate of the catalyst is slowed down. The catalyst is regenerated by using a solvent cleaning and low-temperature heat treatment scheme, so that cyclic regeneration of the organic solid acidic resin catalyst is realized.

The invention discloses a Ni-doped nanoflower structure Ni-V2O5-coated NC and a preparation method and application thereof, and belongs to the technical field of water electrolysis oxygen production. The preparation method comprises the following specific steps: sequentially adding ammonium metavanadate, oxalic acid dihydrate and nickel nitrate hexahydrate into deionized water, stirring until the materials are dissolved, and carrying out hydrothermal and carbonization treatment to obtain the Ni-V2O5-coated NC with the nano flower-shaped structure. According to the invention, the agglomeration phenomenon of V2O5 is inhibited by using a Ni doping method, so that a high specific surface area and rich active sites are provided; ni doping optimizes the defect structure of V2O5, and is beneficial to excitation of active sites, so that the catalyst has high reaction activity. Ni has high conductivity, and the conductivity of the material is improved after V2O5 is doped. In addition, Ni doping is beneficial to formation of a more stable oxidation state, so that the crystallinity and the stability are improved. Based on the advantages, the Ni-V2O5-coated NC shows good electrochemical performance in oxygen evolution reaction (OER).

The invention relates to the field of small molecule peptide extraction, in particular to a preparation method and application of yak bone marrow protein peptide for increasing bone mineral density, and solves the problems that in the cryopreservation process, the activity of protein is reduced, enzymolysis is not thorough after a polyphenol compound is combined with protein, and the activity of small molecule peptide is low. Comprising the following steps: embedding a polyphenol compound by using a special embedding material to form a protein protection body, mixing yak bone marrow and the protein protection body, performing ultrasonic dispersion, freeze-drying, putting into an extracting solution, adding petroleum ether into a lower-layer extracting solution for extracting, removing grease and the special embedding material in one step, then adding saturated ammonium sulfate, filtering, and dissolving by using clear water. The method comprises the following steps: firstly, preparing a macromolecular protein active solution, carrying out ultrafiltration enzymolysis on the macromolecular protein active solution to obtain a small molecular peptide solution, and carrying out post-treatment to obtain the high-activity protein peptide. According to the method, the protein is convenient to transport after being refrigerated at low temperature, and the activity of small molecule peptide after enzymolysis is higher.

The invention discloses a gold monatomic catalyst for catalyzing acetylene hydrochlorination and a preparation method and application thereof.The preparation method comprises the steps that activated carbon is added into an ethanol solution containing a triazine nitrogen-containing heterocyclic organic compound and alkali metal bromide, the mixture is dried after being stirred and then calcined in the nitrogen atmosphere, and a treated carrier is obtained; and mixing the treated carrier with a gold precursor solution, and then stirring under protective gas. According to the prepared gold monatomic catalyst, introduced alkali metal atoms and N atoms in the carrier are preferentially coordinated, so that the subsequently loaded active component Au is mainly coordinated with C, and the electronegativity of the alkali metal atoms and the C is similar, so that the active component Au can exist in a relatively low valence state, and the catalytic activity of the catalyst is improved. The content of the active component Au at + 1 and + 3 valence is obviously improved, so that the stability of the active component in the catalyst is improved, the catalytic activity and stability of the catalyst are improved, and the generation of carbon deposition can be reduced.

This invention provides an integrated reactor for one-step ammonia production from water and nitrogen, comprising an odd number of reaction units stacked sequentially to form an integrated structure. Each reaction unit includes a sequentially stacked oxygen separation layer, a reaction layer, and an ammonia separation layer. The reaction layer comprises a Ti3AlC2MAX phase ceramic matrix and an Au-MoC / perovskite photothermal composite catalyst. An ammonia purification membrane is also provided at the ammonia collection pipe junction. This invention proposes an Au-MoC / perovskite photothermal composite catalyst for the aforementioned integrated reactor. A one-step ammonia production method from water and nitrogen is also proposed, including raw material pretreatment, a four-field resonant coupled catalytic reaction, and gas separation. This invention achieves a breakthrough improvement in reaction kinetics through four-field resonant coupling of light, electricity, heat, and flow. Compared to the traditional two / three-field superposition system, the electron-hole recombination rate is reduced to below 8%, the N≡N bond activation energy is reduced to 0.79 eV, and the ammonia equilibrium conversion rate is increased to over 95% when nitrogen is used as the nitrogen source, far exceeding existing technologies.

The application discloses a preparation method of a silicone defoaming composition, and a product and application thereof, and belongs to the technical field of defoaming agents. The method comprises the following steps: firstly, a hydroxyl MQ silicone resin and hydrophilic silicon dioxide are pretreated by being reacted under the catalysis of a catalyst tetramethylammonium hydroxide by using polydimethylsiloxane as a solvent; then, after the tetramethylammonium hydroxide is removed by being heated, a hydrogen-containing MQ silicone resin and a vinyl polyorganosiloxane are added and uniformly mixed; finally, the mixture is crosslinked under the action of a platinum catalyst to prepare the defoaming composition. The silicone defoaming composition prepared by the method has the advantages of excellent defoaming performance and easy emulsification, and is particularly suitable for defoaming treatment of pulp black liquor.

The invention provides a method for efficiently preparing furfural through catalytic hydrolysis of cellulose, which comprises the step of efficiently preparing furfural through catalytic efficient hydrolysis by using cellulose as a raw material. The preparation method of the hydrolysis catalyst mainly comprises the following steps: weighing a certain mass of combustible solid waste, putting the combustible solid waste into a tubular furnace, and carbonizing the combustible solid waste in an N2 atmosphere for 2 hours; adding carbonized black solid powder and a proper amount of ferric trichloride into deionized water, stirring to uniformly mix, performing suction filtration, drying and calcining to complete loading, mixing the dried solid and a certain amount of sulfuric acid in a polytetrafluoroethylene kettle, and performing suction filtration and drying at 180 DEG C in a drying oven to obtain a hydrolysis catalyst; the high-efficiency cellulose hydrolysis method based on the catalyst comprises the following steps: mixing the catalyst and a certain amount of cellulose according to a certain mass ratio, placing the mixture in a hydrothermal reaction kettle, adding an organic solvent, completing a catalytic conversion reaction at a certain reaction temperature and heat preservation time, cooling to room temperature, taking out a solid-liquid mixture, and filtering to obtain a filtrate rich in furfural.

The invention discloses a core-shell structure catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The core-shell structure catalyst is successfully synthesized by regulating and controlling the core-shell chemical composition and crystallization conditions. In the preparation method, the utilization of the seed crystal inhibits the influence of the core skeleton characteristics on the shell layer, and the subsequent secondary growth induces to form a shell structure which grows mutually. The catalyst prepared by the invention takes the ZSM-5 zeolite with an acidic core site as a main component and the MCM-22 zeolite with a supercage structure as a structural basis, the ZSM-5 zeolite and the MCM-22 zeolite have a synergistic effect and respectively show excellent performance in dehydrogenation, oligomerization, cyclization reaction and carbon deposition resistance of methane, and compared with a traditional catalyst, the catalyst has the advantages that the catalyst has higher catalytic activity by constructing a heterogeneous molecular sieve core-shell structure and loading the metal Mo, and the catalyst has better application prospect. According to the catalyst, the benzene yield is obviously improved, the service life is prolonged, and the carbon deposition resistance is relatively high. The prepared core-shell structure catalyst not only serves MDA, but also can be expanded to other high-temperature acid catalytic reactions, and industrialization and process integration are promoted.

The invention provides high-stability frozen dough and a preparation method thereof. Comprising the following steps: S1, weighing flour and salt, and uniformly mixing to obtain powder; s2, water and yeast gel are added into the powder, stirring is performed until gluten is completely formed, and fresh dough with the smooth and uniform surface is prepared; and S3, sealing the fresh dough in a freshness protection bag, quickly freezing for 90 minutes in a refrigerator at the temperature of minus 40 DEG C until the center temperature of the dough reaches minus 18 DEG C, and freezing to obtain the frozen dough. The compound pectin and the compound bio-enzyme preparation are used for wrapping the yeast to prepare gel, so that the water loss in the freezing process is reduced, the dough is prevented from being dried and cracked in the freezing storage period, and the yeast can be uniformly distributed in the dough; the pectin and the enzyme preparation interact to form a more stable network structure, so that the texture and elasticity of the dough are improved.

The invention discloses a freeze-drying protective agent of an infectious laryngotracheitis recombinant fowlpox virus genetic engineering vaccine as well as a preparation method and application of the freeze-drying protective agent, and belongs to the technical field of veterinary biological products. In order to reduce the virus loss of the avian infectious laryngotracheitis recombinant fowlpox virus genetic engineering vaccine in the freeze-drying process and improve the virus titer, different freeze-drying protective agent formulas and freeze-drying curves are screened, and a freeze-drying protective agent capable of reducing the virus loss of the vaccine and a matched freeze-drying process of the freeze-drying protective agent are successfully developed. The screened freeze-drying protective agent and freeze-drying curve can reduce the virus loss of the avian infectious laryngotracheitis recombinant fowlpox virus genetic engineering vaccine in the freeze-drying process, greatly improve the feather quantity contained in each bottle of vaccine, and ensure the stability of the vaccine during the vaccine storage period; the production cost can be reduced while the vaccine quality is improved, and actual production requirements are met.

The present application relates to the technical field of ganoderma lucidum spore powder processing, and particularly to a method for extracting effective components of ganoderma lucidum spore powder. The method comprises the steps of pretreatment, wall breaking treatment, degreasing treatment, concentration treatment and purification treatment. The method for extracting effective components of ganoderma lucidum spore powder has low technical difficulty, is easy to be industrialized, has simple preparation process, high wall breaking rate, and high extraction rate (above 85%) of polysaccharide, which is an effective component of ganoderma lucidum spore powder and is more easily absorbed by human body. The method effectively promotes the positive effect of the effective components of ganoderma lucidum spore powder on human body and improves the utilization rate of ganoderma lucidum spore powder.