2593 results about "Nitrogen source" patented technology

The invention relates to the technical field of microorganisms, and provides a low-temperature-resistant heterotrophic nitrification-aerobic denitrification pseudomonas and application thereof, the strain is pseudomonas (Pseudomonas sp.) SW1, and the preservation number is CCTCC (China Center for Type Culture Collection) NO: M 20221797. The low-temperature-resistant heterotrophic nitrification-aerobic denitrification bacterium Pseudomonas sp. SW1 has the characteristic of low temperature resistance, can well grow at 4-10 DEG C, and has relatively strong heterotrophic nitrification-aerobic denitrification nitrogen removal capability, and the enrichment culture of the strain is carried out in a relatively low nitrogen source, and the condition is extremely consistent with the application scene of the strain in domestic sewage.

The invention relates to the field of agricultural soil improvement and ecological fertilization, and discloses an ecological fertilization method for improving the organic matter content of soil in a dry-hot valley region, and the method comprises the following steps: soil matrix improvement: improving the porosity and water binding capacity of the soil by adding charcoal and humic acid particles; the functional microbial preparation is put, and the activity of soil microorganisms is activated through the combined effect of cellulose decomposition bacteria, stabilization promoting flora and water retention flora; green manure crop planting and covering management: planting sweet clover and other leguminous crops to provide a carbon source and a nitrogen source for soil, and meanwhile, utilizing straw covering to inhibit water evaporation; turning over and stabilizing the green manure crops, namely turning over and stabilizing the organic matters in a blooming period of the green manure crops and combining with a stabilization promoting bacterial liquid and an adsorptive carrier; dynamic balance is maintained, and dynamic balance of decomposition, conversion and accumulation of organic matter is achieved step by step through multi-cycle planting and turning and pressing. The organic matter content and fertility of the soil can be improved, and the water-retaining property and microbial ecosystem of the soil are improved.

The invention provides a doped electrode material based on porous silicon carbon and a preparation method thereof.The preparation method comprises the steps that a resin base material is smashed and then put into a high-temperature furnace to be subjected to a carbonization process, the carbonization temperature ranges from 300 DEG C to 1500 DEG C, an alkaline additive, a phosphorus source material and a nitrogen source material are sequentially added in the temperature interval, and phosphorus-nitrogen co-doped porous carbon is obtained; the preparation method comprises the following steps: mixing a silicon dioxide microsphere template into phosphorus-nitrogen co-doped porous carbon, adding a first coating carbon source to carry out first coating treatment, and etching the silicon dioxide microsphere template by using an etching solution to obtain a prefabricated object with a cavity structure; and putting the prefabricated object with the cavity structure into a fluidized bed reactor, introducing silicon source gas and a surface activation auxiliary agent, carrying out deposition at 400-550 DEG C, and then adding a second coating carbon source to carry out secondary coating treatment, thereby obtaining the doped electrode material based on porous silicon carbon. Therefore, the expansion coefficient of the electrode material is effectively reduced, and the rate capability is improved.

The invention discloses a land-sea system nitrogen and phosphorus pollutant collaborative source analysis method, and particularly relates to the field of environmental governance and water pollution traceability, which comprises a comprehensive method based on a multi-isotope tracer technology, an isotope mixed model and nitrogen and phosphorus molar ratio verification, and comprises the following steps: acquiring isotope characteristics of nitrogen sources and phosphorus sources in various forms of a land-sea system; in combination with hydrology and water quality monitoring data, the polymorphic contribution of river water, underground water, coastal terrestrial sources and estuary endogenesis to estuary nitrogen and phosphorus pollutants is quantitatively analyzed; through accurate calibration of underground water input, dynamic quantification of pollution flux and cooperative analysis of nitrogen and phosphorus pollutant sources, the problem of insufficient systematicness and accuracy in tracing of complex multi-source pollutants in the prior art is solved, and a basis is provided for drainage basin-estuary-bay integrated treatment.

The invention belongs to the technical field of microbial fermentation and food engineering, and discloses a fermentation method for enhancing the production capacity of schizochytrium limacinum phospholipid DHA and application, schizochytrium limacinum is subjected to fermentation culture for 32-60 h, and the addition of an organic nitrogen source and phosphate is optimized in the fermentation culture process; the formula of a seed culture medium for culturing schizochytrium limacinum is not changed, and only the formula of a fermentation culture medium for schizochytrium limacinum is changed. The invention provides a fermentation strategy for enhancing the production capacity of the schizochytrium limacinum phospholipid DHA, and the schizochytrium limacinum can obtain the phospholipid DHA with higher content by optimizing an organic nitrogen source and phosphate in a schizochytrium limacinum fermentation culture medium. According to the obtained schizochytrium limacinum grease, the total DHA content is obviously increased compared with that of a traditional fermentation strategy, and the proportion of phospholipid DHA is also remarkably increased. The regulation and control method is applied to preparation of schizochytrium limacinum algae powder, the schizochytrium limacinum algae powder rich in phospholipid DHA is obtained, and application of the schizochytrium limacinum algae powder in the field of aquatic feed is facilitated.

The invention discloses a synthesis method of amphiphilic quantum dots and application of the amphiphilic quantum dots in nano oil displacement, and belongs to the field of nano oil displacement. The synthesis method comprises the following steps: heating a mixture containing a carbon source and a nitrogen source in an air atmosphere for reaction, and centrifuging, filtering and drying a reaction product to obtain the amphiphilic quantum dots, the carbon source is selected from at least one of glucose, mannose, citric acid, lignin, chitosan and starch; the nitrogen source is selected from at least one of alkylamine, and the carbon chain length of the alkylamine is C6 to C12. The synthesis method is simple, heating of a high-pressure reaction kettle is not needed, the technological process is simple, and the method is suitable for large-scale industrial production; the series of amphiphilic carbon quantum dots show better solubility and higher absolute fluorescence quantum yield in water and various organic solvents.

The invention provides starch-based hard carbon and a preparation method thereof, a negative electrode plate, a sodium ion battery and electric equipment, and relates to the technical field of new energy. According to the preparation method disclosed by the invention, hydroxyl and hydrogen atoms in the starch are consumed through organic acid esterification, so that a molten state is not formed in the subsequent oxidation crosslinking and carbonization processes, the structure and strength of a carbon skeleton are improved, and functional groups and doped atoms are more easily introduced; in the oxidation cross-linking process, oxygen-containing functional groups mainly containing carbonyl are mainly introduced, and the cross-linking degree is enhanced, so that phosphorus and nitrogen atoms are better doped in subsequent carbonization, a better spherical structure is formed, and the subsequent carbonization yield is further improved. The starch-based hard carbon material prepared by the method has the advantages that the starch-based hard carbon material is mixed with the phosphorus source and the nitrogen source for carbonization, the pore-forming process and the phosphorus-nitrogen atom doping process can be directly completed in the heating process, and open pores are changed into closed pores in the high-temperature and constant-temperature process, so that the prepared starch-based hard carbon material has excellent structure and surface groups and heteroatoms, and the dynamic performance of the starch-based hard carbon material is further optimized.

The invention discloses a river nitrogen pollutant source analysis method based on drainage basin nitrogen turnover and isotope, and particularly relates to the technical field of water treatment.The river nitrogen pollutant source analysis method comprises the following steps that a drainage basin to be researched is selected, river water and soil samples in the drainage basin are systematically collected, and physical and chemical indexes and isotope indexes # imgabs0 # of the collected samples are tested. Nitrate marked by nitrogen isotope delta 15N / delta 18O and # imgabs1 # are used as key indication marks to perform high-precision identification on nitrogen sources in a river and an environmental system, the contribution proportion of different nitrogen sources to the nitrate concentration in a water body is quantified through a stable isotope analysis model, and the concentration of the nitrate in the water body is calculated. And in combination with data, the rates of denitrification and anaerobic ammonia oxidation in environmental samples, sediments and soil are directly measured through combined application of an isotopic tracer technology and a membrane inlet mass spectrometer technology.

The invention provides a full-automatic vacuum oxygen-free oven, belongs to the technical field of wafer processing, and solves the problems that an existing wafer oven is low in feeding, discharging, heating and baking efficiency; and the automation degree is low. The full-automatic vacuum oxygen-free oven comprises an oven frame assembly, an EFEM frame assembly, two vacuum pump assemblies and four wafer loaders which are evenly distributed at equal intervals, four cavity assemblies and four automatic door assemblies are arranged in the oven frame assembly, and a robot transplanting assembly and a machine control box are arranged in the EFEM frame assembly. A main control computer is arranged on the left side of the EFEM frame assembly, the cavity assemblies are connected with the vacuum pump assemblies on the same side through exhaust pipelines, and the cavity assemblies are connected with an external high-purity nitrogen source. According to the invention, through cooperation of multiple sensors, mechanical linkage and a gas-liquid cooling system in the whole process, full-automatic stable grabbing and loading, vacuumizing treatment, heating, constant-temperature process baking treatment, dual-mode cooling and taking treatment of wafers in an oxygen-free and high-precision temperature control environment are realized.

The invention discloses a MoS2-coated porous M-N-C monatomic catalyst and an application thereof in a lithium air battery, the MoS2-coated porous M-N-C monatomic catalyst is prepared by the following steps: chelating transition metal ions through a chelating agent, anchoring the transition metal ions on a porous carbon carrier, mixing the transition metal ions with a nitrogen source precursor, and calcining to obtain a material which takes porous nitrogen-doped carbon as a carrier and loads a transition metal monatomic M, thereby obtaining the MoS2-coated porous M-N-C monatomic catalyst. And wrapping the layered MoS2 nanosheets through a hydrothermal vulcanization method and high-temperature calcination to obtain the target catalyst material. The obtained composite material has higher mass transfer efficiency, has higher oxygen reduction activity and stability in acidic and alkaline media, has lower overvoltage, high specific discharge capacity and excellent cycle performance when being used as a lithium air battery catalyst, and has better research prospects.

The invention relates to the technical field of biological medicine, in particular to a dynamic fermentation tank control system for producing a diabetes intestinal microecological regulating preparation. The system comprises a fermentation tank sensing feedback control network establishment module, a fermentation tank growth earlier-stage nutrition supply control module, a fermentation tank growth later-stage adjustment control module and a fermentation tank metabolism process environmental condition control module, and can generate an embedded sensing feedback control network by installing a sensor and being connected with a central feedback control system. The sugar source supply quantity, the nitrogen source supply quantity, the temperature, the pH value, the dissolved oxygen concentration and the oxygen and carbon dioxide gas proportional flow corresponding to the fermentation tank are synchronously monitored in real time, so that supply cooperative dynamic control and fermentation growth cooperative dynamic control are carried out, and meanwhile, metabolism environment condition cooperative dynamic control is carried out; therefore, the cooperative control work of the microbial growth environment conditions is executed. By optimizing environment control in the fermentation process, efficient production of the intestinal microecology regulating preparation can be achieved.

The invention provides a nitrogen-doped biomass-based fluorescent carbon quantum dot, a preparation method and application, and relates to the technical field of carbon nanomaterials, the method comprises the following steps: mixing a biomass material and deionized water under an ultrasonic condition, adding a nitrogen source, and carrying out ultrasonic dispersion to obtain a uniformly dispersed to-be-reacted solution; reacting the to-be-reacted solution at a preset temperature for a preset time to obtain a mixed product solution; and filtering and dialyzing the mixed product solution to obtain the nitrogen-doped biomass-based fluorescent carbon quantum dot solution. The nitrogen-doped biomass-based fluorescent carbon quantum dot prepared by the method shows a stable fluorescent effect and good water solubility, the free radical clearance rate can reach 90% or above, and the antibacterial rate can reach 99% or above. The method can be used in the fields of drug sustained release, bioimaging and the like.

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 discloses a Burkholderia sp. Strain and an application thereof in prevention and treatment of eucalyptus blight. The Burkholderia sp. AS-SF-1 disclosed by the invention has the preservation number of GDMCC (Graphical December Microorganism Center) No. 66223; the culture and volatile matter of the strain can inhibit growth of various forest pathogenic bacteria, the eucalyptus has a remarkable control effect on branch blight, siderophore can be generated, absorption and utilization of iron can be promoted, various types of carbon sources or nitrogen sources can be utilized, and the strain can grow within the pH range of 4-9. The burkholderia sp. AS-SF-1 disclosed by the invention has an important application value on planting of eucalyptus and prevention of diseases.

The invention provides a B / N co-doped high-graphitization-degree artificial graphite negative electrode material and a preparation method thereof, and the preparation method of the artificial graphite negative electrode material comprises the following steps: crushing raw material coke to obtain primary particles, and then mixing, granulating and shaping to obtain secondary particles; fully mixing the obtained secondary particles with an organic nitrogen source, and then pre-carbonizing to obtain a nitrogen-doped precursor; and fully mixing the obtained nitrogen-doped precursor with an organic boron source, and then carrying out secondary carbonization, shaping and graphitization to obtain the B / N co-doped high-graphitization-degree artificial graphite negative electrode material. The artificial graphite negative electrode material disclosed by the invention has high energy density and high rate performance, and meanwhile, the first efficiency can also be improved.

The invention discloses a synthesis method and application of an iron-aluminum co-doped catalyst, and the synthesis method is characterized by comprising the following steps: S1, dissolving an aluminum metal salt and an iron metal salt in a beaker containing deionized water to obtain a solution A; s2, adding a phosphorus source into the solution A, and adjusting the pH to form a turbid liquid B; s3, biomass is added into the turbid liquid B to be stirred for 30 min, and a solution C is obtained; s4, adding a nitrogen source into the solution C, and drying the beaker in a water bath kettle; mixing the obtained dried product with an activating agent, and calcining under inert gas to obtain a catalyst crude product; and S5, grinding the catalyst crude product, washing with ethanol and deionized water, and carrying out vacuum drying to obtain the iron-aluminum co-doped catalyst. The preparation method is simple and low in equipment requirement. The invention discloses a novel nitrogen-doped carbon-coated zero-valent iron nanoparticle catalyst which can degrade pollutants by utilizing electron transfer of the pollutants and the catalyst under the condition of adding any oxidizing agent. Under the neutral room temperature condition, the catalyst has a very good removal effect on degradation of organic pollutants which are difficult to biodegrade, has very good stability, and is low in iron ion dissolution rate.

The application discloses a kind of traditional Chinese medicine rose flower fermentation method and fermentation composition, it is related to fermentation technical field.The traditional Chinese medicine rose flower fermentation method includes: traditional Chinese medicine rose flower is crushed, mixed with water, and after sterilization, fermentation base material is obtained, yeast peptone solution is added, as blank fermentation pre-liquid;Activated rhamnolipid lactose casein bacillus liquid is inoculated in blank fermentation pre-liquid, and fermentation is carried out.The traditional Chinese medicine rose flower fermentation method provided by the application uses traditional Chinese medicine rose flower as raw material, and utilizes activated rhamnolipid lactose casein bacillus liquid to ferment, without adding exogenous sugar in the fermentation process, but before fermentation, yeast peptone is added first, the addition of yeast peptone can supplement nitrogen source for the fermentation process of subsequent activated rhamnolipid lactose casein bacillus liquid, so that the nutrient content of fermented rose flower is more, and component conversion is more thorough.It is favorable to improve the DPPH free radical scavenging rate, total phenol content and antioxidant property of fermentation composition.

The invention discloses a mother strain culture medium for boletus xylophilus as well as a preparation method and application of the mother strain culture medium, and belongs to the technical field of microbial culture. The preservation number of the strain JSJ-Bx1 of the boletus sinensis mother strain is CGMCC (China General Microbiological Culture Collection Center) No.42007, and the strain JSJ-Bx1 is preserved in the China General Microbiological Culture Collection Center; the culture medium is prepared from 10-30 g of a carbon source, 2-6 g of a nitrogen source, 1-3 g of inorganic salt, 0.1-0.3 g of a growth factor suitable for the culture medium, 20 g of agar and 1 L of water, and the pH of the culture medium is 4-6. By the adoption of the culture medium, hyphae of the boletus sinensis mother strain grow fast, grow vigorously and are dense, the edges of bacterial colonies are neat, hypha degeneration phenomena such as pigment and water spitting are avoided, and the mother strain culture growth cycle is greatly shortened.

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution, a precipitator and a complexing agent, and carrying out coprecipitation reaction on an obtained coprecipitation reaction precursor solution to obtain a lithium-rich manganese-based precursor; the metal salt solution comprises a manganese element, a cobalt element and a nickel element; and mixing the lithium-rich manganese-based precursor, a lithium source, an auxiliary agent and a dispersing agent, and calcining to obtain the lithium-rich manganese-based positive electrode material, the auxiliary agent comprises a nitrogen source or a nitrogen source and a carbon source. The first discharge specific capacity, the rate capability and the cycling stability of the lithium-rich manganese-based positive electrode material can be improved, and the problems of capacity fading, discharge voltage drop and dynamic delay in an electrochemical reaction process are solved.

The present invention relates to increasing and / or maintaining nitrogen content in soil by administration of nitrogen sources particles coated with urease inhibitors. In one embodiment, urease inhibitors are dispersed in an improved organo liquid delivery system at concentration levels of 60-95%. In another embodiment, urease inhibitors were applied in a non-aqueous, organo liquid delivery system coating nitrogen sources particles utilizing simple blending equipment at temperatures of 20°-70° C. Another embodiment discloses dry, flowable nitrogen sources coated with a urease inhibitor which can be administered directly to the soil, to a dry natural and / or a manmade fertilizer or to a liquid fertilizer which provides for the reduction of nitrogen loss from the soil. In another embodiment, a composition of urea and <0.2% dimethyl sulfoxide improves the crush resistance of the urea particles.

The invention relates to a preparation method and application of a cobalt-doped porous carbon nitride nanosheet, and the preparation method comprises the following steps: (1) taking a nitrogen source and a cobalt source as raw materials, grinding the nitrogen source and the cobalt source, uniformly mixing, calcining at high temperature, naturally cooling to room temperature, washing the calcined substances of the nitrogen source and the cobalt source, and drying in vacuum to obtain the cobalt-doped carbon nitride nanosheet; and (2) dispersing the cobalt-doped carbon nitride nanosheet obtained in the step (1) in hydrazine hydrate for heating reaction, washing the cobalt-doped carbon nitride nanosheet to be neutral after the heating reaction is finished, and finally performing vacuum drying to obtain the cobalt-doped porous carbon nitride nanosheet. The cobalt-doped porous carbon nitride nanosheet prepared by the method disclosed by the invention is a catalytic material which is high in response capability to visible light, high in yield of hydrogen peroxide prepared by photocatalysis, good in decomposition inhibition performance and capable of being repeatedly used, and is suitable for the field of new energy products.

The invention relates to a non-noble metal fuel cell oxygen reduction catalyst based on a self-assembled semi-interpenetrating polymer network and a preparation method and application thereof, and belongs to the technical field of fuel cell oxygen reduction catalysts. The preparation method of the catalyst comprises the following steps: S1, dissolving polysaccharide in ultrapure water, heating and stirring, then adding a polymer monomer, a polymerization initiator, a salt template and a non-noble metal source solution, heating and stirring until uniform orange red hydrogel is obtained, then adding a nitrogen source, continuously heating and stirring, and evaporating a solvent to dryness, so as to obtain a polysaccharide solution; freezing and drying to obtain an orange powder sample; s2, performing pyrolysis treatment on the orange powder sample to obtain a black powder sample, and performing acid pickling, suction filtration and drying to obtain a precursor product; s3, pyrolyzing the precursor product again to obtain the catalyst. The semi-interpenetrating polymer network hydrogel is synthesized in a self-assembly mode, and the catalyst with high loading capacity and atomic-scale dispersion is formed through pyrolysis.

The invention discloses a FeAl diatomic catalyst with axial chlorine modification as well as a preparation method and application thereof, and relates to an atomic-scale dispersion catalyst as well as a preparation method and application thereof. The FeAl diatomic catalyst with axial chlorine modification provided by the invention takes nitrogen-doped carbon as a main body, and FeAlClN6 active sites are distributed in the main body; the structure of the FeAlClN6 is as follows: Fe and Al are coordinated with four N atoms, wherein two N atoms are bridge type N atoms coordinated with Fe and Al at the same time; eight atoms of FeAlN6 are in the same plane, and Al is coordinated with Cl in the vertical direction. The preparation method comprises the following steps: dispersing the carbon matrix, the iron source, the aluminum source and the nitrogen source in a solvent, stirring, drying by distillation, and carrying out heat treatment on a solid in an inert atmosphere to obtain the catalyst. The highest power density of a fuel cell assembled by the catalyst reaches 1339mW / cm < 2 >, the half-wave potential retention rate is 98% after 30,000 cycles of cyclic aging, and the catalyst can be applied to the electro-catalysis fields such as pollutant degradation, chemical nitrogen fixation and carbon sequestration, catalytic energy conversion and the like.

The invention discloses a nitrogen-doped carbon-supported transition metal monatomic material as well as a preparation method and application thereof, and belongs to the technical field of inorganic catalyst materials. The preparation method provided by the invention comprises the following steps: (1) grinding a mixture containing a transition metal precursor, a nitrogen source and a carbon source to obtain an initial mixture; and (2) pyrolyzing the initial mixture in an inert gas atmosphere to obtain the nitrogen-doped carbon-supported transition metal monatomic material. The material provided by the invention can efficiently catalyze carbon dioxide to be reduced into carbon monoxide in a carbon dioxide saturated potassium bicarbonate electrolyte, and the selectivity is higher than 90% or above. The preparation method provided by the invention has universality, is easy for large-scale production, and can be used for synthesizing other similar monatomic materials. The nitrogen-doped carbon-supported transition metal monatomic material prepared by the invention is applied to electrochemical carbon dioxide reduction as an electrocatalyst, and can show excellent catalytic activity, selectivity and stability.

The present disclosure provides agronomically stable liquid agricultural compositions, methods of formulation thereof, and methods of application thereof. The agricultural compositions comprise nitrogen-fixing microorganisms and one or more of a buffering agent, a microbial stabilizer, and a physical stabilizer. The disclosed liquid agricultural compositions have a longer shelf life and greater ease of application than other existing dry and liquid formulations. The disclosed liquid agricultural compositions are stable for a period of thirty days or longer with low toxin accumulation and high microbial stability. The compositions are suitable for use on agricultural plant tissues or the environs thereof for providing a source of fixed atmospheric nitrogen to the agricultural plant. The compositions are used to increase crop yield and decrease yield variance.

The invention belongs to the technical field of catalyst preparation and wastewater treatment, and particularly relates to an iron-nitrogen co-modified biochar catalyst as well as a preparation method and application thereof. Comprising the following steps: (1) pyrolyzing a biomass precursor at 200-400 DEG C in an inert gas atmosphere to obtain low-temperature biochar; (2) sufficiently mixing an iron salt solution, an organic nitrogen source and the low-temperature biochar through an impregnation method to obtain a mixed solution, and drying the mixed solution to obtain an iron-nitrogen co-modified biochar precursor; and (3) pyrolyzing the iron-nitrogen co-modified charcoal precursor at 600-1000 DEG C in an inert gas atmosphere to obtain the iron-nitrogen co-modified charcoal catalyst. The iron-nitrogen co-modified biochar catalyst is used for treating organic matters in high-salt organic wastewater, can realize catalytic polymerization removal of the organic matters, and effectively solves the problems that the number of active sites of biochar is limited, the electron transfer efficiency is relatively low, and the utilization efficiency of an oxidant in a persulfate activation technology is low and the mineralization ability is poor.

The invention discloses a method for producing docosahexaenoic acid by strengthening schizochytrium limacinum, which comprises the following steps: carrying out fermentation culture on a schizochytrium limacinum strain until the growth period is ended (a nitrogen source is used up); when the growth period of the schizochytrium limacinum is ended, exogenously adding hydrogen peroxide, culturing, exogenously adding para aminobenzoic acid, and culturing; and repeating for several times, and ending the fermentation to obtain the DHA-containing fermentation liquor. Compared with execution of a blank group without addition of exogenous additives, an independent hydrogen peroxide intermittent feeding control strategy and an independent aminobenzoic acid intermittent feeding control strategy, the DHA yield is increased by 25.21% or above when the hydrogen peroxide-p-aminobenzoic acid periodic control method is adopted, and the highest level of 1.49 g / L is achieved.

The invention discloses a 3d transition metal M-rare earth metal R bi-component doped carbon-supported Pt catalyst as well as a preparation method and application thereof, relates to a catalyst taking doped carbon as a carrier to support Pt as well as a preparation method and application thereof, and aims to solve the problem that the existing Pt / C catalyst is poor in catalytic activity and stability. Wherein M is Fe, Co, Ni or Zn, and R is Ce, Nd or Gd. The preparation method comprises the following steps: carrying out complexing growth on M and R ions and a nitrogen source ligand on the carbon surface, and then carrying out high-temperature carbonization to obtain an M-R bi-component doped carbon carrier; the preparation method comprises the following steps: preparing an M-R two-component doped carbon-carbon supported Pt catalyst by using a microwave reduction method, then loading Pt by using a microwave reduction method to obtain the M-R two-component doped carbon-carbon supported Pt catalyst, the mass activities of Pt / Fe-Ce-NC and Pt / Co-Ce-NC are respectively 0.27 A / mgPt and 0.22 A / mgPt and are 2.8 times and 2.3 times that of Pt / C, and the M-R two-component doped carbon-carbon supported Pt catalyst can be used in the field of proton exchange membrane fuel cells.

The invention discloses a superconducting carbon black co-production method based on directional refining of catalytic slurry oil and a product thereof, and belongs to the technical field of carbon black preparation, and the method comprises the following steps: mixing the catalytic slurry oil and catalytic circulating oil to obtain mixed slurry oil, and adding a deliming agent for settling separation to obtain purified slurry oil; carrying out continuous solvent extraction on the obtained purified oil slurry to respectively obtain an aromatic component and a heavy component; carrying out thermal polycondensation reaction on the obtained aromatic component in a magnetic field environment in the presence of a catalyst and a cross-linking agent, and then carrying out supercritical fluid extraction to obtain spinnable mesophase pitch; carrying out slurry reactor hydrogenation deconstruction on the obtained heavy component to obtain stable micromolecular carbon black raw oil, mixing the carbon black raw oil with a nitrogen source and a template precursor, carbonizing, and carrying out acid pickling to obtain the superconducting carbon black; through a heavy oil slurry reactor hydrogenation deconstruction'doping-template 'synergistic carbonization strategy, the superconductive carbon black with nitrogen / phosphorus co-doped and developed hierarchical porous structure is constructed in situ by a one-step method.

The invention discloses a nitrogen-doped artificial graphite negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: pretreating and graphitizing raw material coke to obtain artificial graphite; and compounding the artificial graphite and a nitrogen source under an alkaline condition, and calcining to obtain the negative electrode material. According to the unique preparation method, the nitrogen element can be introduced into the artificial graphite, and the molecular structure of the ink sheet is changed due to the introduction, so that the connection between layers is enhanced. Compared with the conventional lithium ion battery, the lithium ion battery containing the nitrogen-doped artificial graphite negative electrode material has the advantages that the specific discharge capacity is improved, and the cycle life is remarkably prolonged.