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1498results about How to "High nitrogen content" patented technology

Preparation method of nitrogen-doped porous-structure carbon material

The invention discloses a preparation method of a nitrogen-doped porous-structure carbon material and belongs to the technical field of inorganic material preparation. The preparation method utilizes a micromolecular carbon-containing compound as a raw material and comprises the following steps of based on the weight of the raw material, adding 0-400wt% of an inorganic base, 0-400wt% of an organic nitrogen-containing compound and 0-50wt% of a metal or metal oxide or inorganic metal salt into the raw material, carrying out uniform dispersion, and carrying out a reaction process in an inert gas protective atmosphere at a temperature of 400-900 DEG C for 0.5-12h so that the nitrogen-doped porous-structure carbon material having micropores, mesopores and macropores is obtained. The preparation method has simple processes, can be controlled easily, and realizes one-step combination of porous structure, functionalization nitrogen doping and metal particle modification. The nitrogen-doped porous-structure carbon material having high nitrogen content has a large capacitance value and good cycle performances, can be used as an oxygen reduction reaction catalyst having high activity, high selectivity and high stability and has a very large application prospect.
Owner:BEIJING UNIV OF CHEM TECH

Composite material of nitrogen-doped porous carbon-wrapped carbon nano tube as well as preparation method and application of material

The invention relates to a composite material of a nitrogen-doped porous carbon-wrapped carbon nano tube as well as a preparation method and an application of the composite material. The preparation method comprises the following steps: dispersing the carbon nano tube in water, adding a carbon source to obtain a reaction system, subsequently performing hydrothermal reaction, performing thermal treatment on the carbon nano tube wrapped with a carbon layer on the surface, and a nitrogen source at the high temperature so as to obtain the composite material of the nitrogen-doped porous carbon-wrapped carbon nano tube. According to the preparation method, the carbon source is polymerized under a hydrothermal reaction condition so as to obtain the carbon layer, the outer surface of the carbon nano tube is wrapped with the carbon layer, subsequently the carbon layer is carbonized and decomposed to generate a porous structure under high temperature treatment, and at the same time, the gasified nitrogen source is diffused to the carbon layer through ducts to be subjected to in-situ doping. The composite material provided by the invention can be used as a cathode oxidation reduction catalyst of a fuel battery, is excellent in catalysis, and is high in oxidation activity when being compared with other nitrogen-doped materials reported in documents. The preparation method provided by the invention is simple and economic in process, convenient to operate and easy to achieve the large-scale production.
Owner:INST OF CHEM CHINESE ACAD OF SCI

Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof

The invention provides a nitrogenous nickel-free stainless steel and a powder-metallurgical molding technology, relating to the field of stainless steel production. Nitrogenous stainless steel powder and a prepared cementing agent are mixed evenly in a mixing machine and then crashed to injection molding feedstock; injection molding blanks with smooth surfaces and without macro defects are obtained by an injection molder under appropriate injection temperature and injection pressure; after degreasing by chlorylene solvent, thermal degreasing and presintering are carried out to the injection molding blanks, thermal degreasing blanks with certain strength and without defects are obtained; the thermal degreasing blanks are sintered and densified in nitrogen based atmosphere, therefore, products with higher density and more excellent performance can be obtained. The nitrogenous nickel-free stainless steel of the invention can solve the problems that resource price of the nickel-contained stainless steel is expensive and the contained nickel thereof is harmful to human health and the like, extends the application scope of nitrogenous austenitic stainless steel. The materials prepared by using the nitrogenous nickel-free stainless steel of the invention are better than traditionally smelted austenitic stainless steel in terms of performance and the nitrogenous nickel-free stainless steel of the invention is resource saving and environmentally friendly.
Owner:UNIV OF SCI & TECH BEIJING

Preparation method of nitrogen-rich multimode beehive carbon-sulfur composite anode material

The invention relates to a preparation method of a lithium sulphur battery composite anode material. The preparation method is as follows: preparing a mixed solution of carbon tetrachloride, a nitrogen source and carbonate, heating and flowing back to obtain a nitrogen-rich polymerization / carbonic acid salt compound; high temperature pyrolyzing in a nitrogen or argon atmosphere after drying the compound, so as to form the nitrogen-rich carbon / oxide compound; adding dilute acid to remove vestigial oxide, so as to form the nitrogen-rich multimode beehive carbon material of a multilevel porthole structure; uniformly mixing the nitrogen-rich multimode beehive carbon and sublimed sulfur, heat preserving under vacuum condition, injecting sulfur gas to the nitrogen-rich multimode beehive carbon material, so that the lithium sulphur battery composite positive material can be obtained. The composite anode material provided by the invention is alveolate, and has the advantages that portholes are abundant, sulfur content is high, sulfur particle can be distributed uniformly in the nitrogen-rich multimode beehive carbon material of the multilevel porthole structure, and the carbon sulfur particles can be combined more tightly, the material mechanical stability is high, discharge specific capacity is high, cycle performance is excellent, and technological process is simple, pollution is avoided, cost is low, and the method is liable to large scale production and application.
Owner:CENT SOUTH UNIV

Preparation method of high-performance nitrogen-doped three-dimensional graphene

The invention relates to the technical field of synthesizing of graphene materials and provides a preparation method of nitrogen-doped graphene. The preparation method includes: using an improved Hummers method to prepare continuous large-piece graphene oxide; using a hydrothermal method to prepare the graphene oxide into graphene of a porous three-dimensional structure; ultrasonically dispersing the graphene of the porous three-dimensional structure into an acid solution with the pH being 1-5, adding aniline, well mixing, adding ammonium persulfate, well mixing, and transferring the obtained mixed liquid into a teflon container for hydrothermal reaction so as to obtain a porous three-dimensional graphene-polyaniline compound; performing high-temperature treatment under nitrogen protection to allow polyaniline to decompose out nitrogen sources so as to obtain the nitrogen-doped porous three-dimensional graphene. The method has the advantages that the nitrogen-doped graphene with high nitrogen content can be prepared, the structure of the three-dimensional graphene can be kept, the obtained nitrogen-doped porous three-dimensional graphene is good in electrochemical performance and quite suitable for being used for producing a super capacitor, and the method is convenient to operate and beneficial to industrial popularization.
Owner:NANJING UNIV OF POSTS & TELECOMM

Preparation method of high nitrogen content-doped porous carbon with high specific surface area

The invention discloses a preparation method of high nitrogen content-doped porous carbon with a high specific surface area. The preparation method comprises the following steps: drying and smashing a biomass raw material to obtain particles and carbonizing the particles in a nitrogen atmosphere at a high temperature to obtain carbide; then, dispersing the carbide in a potassium hydroxide solution, and stirring and drying to obtain an alkali and carbon mixture; activating the alkali and carbon mixture at the high temperature in the nitrogen atmosphere, and washing, filtering and drying to obtain the porous carbon material; uniformly dispersing the porous carbon material in a strong acid solution for oxidation treatment, and filtering, washing and drying to obtain an oxidized porous carbon material; and finally, ammonifying the oxidized porous carbon material at the high temperature in an ammonia atmosphere to obtain the high nitrogen content-doped porous carbon with the high specific surface area. The specific surface area of the doped porous carbon is 2500-3500<m2> / g, the pore diameter of the material is 0.5-6nm and the nitrogen content is 4-12%. The method disclosed by the invention is simple and effective, easy to operate, convenient for batch production on a large scale and suitable for application in industrial production.
Owner:TONGJI UNIV

Preparation method of high-nitrogen-doped graphene nanoparticles and application of high-nitrogen-doped graphene nanoparticles as negative material of lithium ion battery

The invention provides a preparation method of high-nitrogen-doped graphene nanoparticles and application of the high-nitrogen-doped graphene nanoparticles as a negative material of a lithium ion battery. The corresponding method comprises the following steps: slowly dropwise adding a preset quantity of zinc nitrate (Zn(NO3)) methanol solution into a methanol mixed solution which is prepared from a preset amount of 2-methylimidazole (C4H6N2) and a preset amount of polyvinylpyrrolidone (PVP), magnetically stirring and standing for preset time, carrying out centrifugal separation to obtain ZIF-8(a complex formed by zinc and 2-methylimidazole) nanoparticles; and putting the obtained ZIF-8 nanoparticles in a high-temperature furnace and calcining at 600-1,000 DEG C for preset time in the nitrogen atmosphere to obtain the high-nitrogen-doped graphene nanoparticles. The preparation process of the high-nitrogen-doped graphene nanoparticles is simple, and the high-nitrogen-doped graphene nanoparticles are uniform in shape, relatively large in specific surface and high in content of nitrogen, and have great application potentials in aspects of lithium ion batteries, electrochemical energy storage, catalysis and the like. The preparation method of the high-nitrogen-doped graphene nanoparticles is simple and efficient, safe and liable to implement, short in synthesis cycle, is capable of preparing a large quantity of high-nitrogen-doped graphene nanoparticles and is expected to be popularized and industrially applied.
Owner:UNIV OF SCI & TECH OF CHINA

High-yield cultivation method for sugarcanes

The invention provides a high-yield cultivation method for sugarcanes. The high-yield cultivation method includes directly applying raw materials of green manure into newly excavated sugarcane furrows; allowing the raw materials of the green manure to ferment under film covering closed conditions for 15-25 days; lifting each mulching film to a side of the corresponding sugarcane furrow after the raw materials ferment and become thoroughly decomposed; adding compound fertilizers into the sugarcane furrows; covering soil on the compound fertilizers; planting sugarcane seedlings. The raw materials of the green manure comprise, by weight, 300-500 parts of broken sugarcane leaves, 300-500 parts of silt from fish ponds, 200-300 parts of farmyard manure, 200-300 parts of bran hulls, 100-200 parts of sweet potato residues, 50-100 parts of yeasts and 20-50 parts of lactic acid bacteria. Sugarcane buds are soaked in mixed solution for 18-24h to obtain the sugarcane seedlings, and the mixed solution comprises 6-24 parts of quicklime, 1-1.5 parts of gibberellin missible oil and 800-1200 parts of water. The high-yield cultivation method for the sugarcanes has the advantages of high bud ratio, low fertilizer and pesticide consumption in planting procedures and capabilities of obviously increasing the yield of the sugarcanes and obviously improving the quality of the sugarcanes.
Owner:黄建军

Nitrogen-doped hollow carbon ball loaded palladium-based catalyst and preparation method thereof, and alcohol fuel cell applying same

The invention relates to a preparation method of a nitrogen-doped hollow carbon ball loaded palladium-based catalyst, which comprises the following steps of: dispersing o-phenylenediamine in a solvent for being stirred at a low temperature, adding an initiator for reacting for 12-24h, then extracting and filtering, and drying in vacuum to obtain a poly(o-phenylenediamine) hollow ball; pyrolyzing an o-phenylenediamine polymer at a high temperature for 2-6h under the protection of an inert gas to obtain a nitrogen-doped hollow carbon ball; and dispersing the nitrogen-doped hollow carbon ball into water, adding a chloropalladic acid solution for ultrasonic treatment, adding a reducing agent for ultrasonic treatment, extracting and filtering after the reaction is completed, and drying in vacuum to obtain the nitrogen-doped hollow carbon ball loaded palladium-based catalyst. The nitrogen-doped hollow carbon ball loaded palladium-based catalyst prepared by adopting the preparation method has the nitrogen content of 10.4-22.4wt%, has the advantages of excellent oxidization reaction catalysis property to alcohol, stable performance, low preparation cost and simple preparation process, and is a novel high-performance catalyst for a low-temperature direct alcohol fuel cell anode.
Owner:NANJING COMM INST OF TECH

Nitrogen-enriched porous material/carbon nano structure composite material as well as preparation method and application thereof

ActiveCN104332596AEvenly dispersedDecentralized regulationCell electrodesNano structuringOrganic solvent
The invention provides a nitrogen-enriched porous material / carbon nano structure composite material as well as a preparation method and application thereof. The composite material is prepared from a nitrogen-enriched porous material and various carbon nano materials by compounding. The preparation method comprises the following steps: melamine, a polyformyl aromatic compound and the carbon nano materials are in contact in an organic solvent to obtain a product, and the contacted product is subjected to a series of processes including separation, heat treatment, washing, drying and the like to obtain the nitrogen-enriched porous material / carbon nano structure composite material. The prepared nitrogen-enriched porous material / carbon nano structure composite material has the high nitrogen content, abundant pore structures and uniformly-distributed carbon nano composite components. The composite material can be used as an electrode material and is applied to secondary batteries including lithium ion batteries and the like; and the composite material has the high capacity and the excellent circulating performance and rate capability, and can meet the requirements of the lithium ion batteries in the actual application.
Owner:THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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