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296results about How to "High nitrogen content" patented technology

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

Boron and nitrogen co-doping chitosan-base activated carbon and method for preparing same

The invention provides a boron and nitrogen co-doping activated carbon which is prepared through utilizing biomass. The boron and nitrogen co-doping chitosan-base activated carbon takes chitosan and boric acid as raw materials, wherein boron in the activated carbon accounts for 1-3wt%, nitrogen in the activated carbon accounts for 4.1-9.2wt%, the specific surface area is 500-1000m<2>/g, and the pore size distribution is 0.46-2nm. The boron and nitrogen co-doping chitosan-base activated carbon takes the chitosan and the boric acid as raw materials and is prepared through co-pyrolysis. According to a method, the combining quantity of the boron in a carbon source and the dispersion degree of the boron in the carbon source are increased under the mutual action of the protonated chitosan and the boric acid, and the boron and nitrogen co-doping chitosan-base activated carbon is obtained through the co-pyrolysis. An environmental-friendly technology for preparing the activated carbon without consuming strong acid and strong alkali is realized, so that a costly and non-environmental-friendly process which consumes a great deal of activating agent and water during the traditional process for preparing the activated carbon is avoided. Moreover, the boron and nitrogen co-doping chitosan-base activated carbon has the advantages of short time consumption, simplicity in preparation technology, simplicity and easiness in equipment and the like.
Owner:DALIAN UNIV OF TECH

Long-effect compound fertilizer containing sulfur with high nitrogen, production method and application thereof

The invention relates to a long-effect compound fertilizer containing sulfur with high nitrogen, a production method and application thereof and belongs to compound fertilizer. The compound fertilizer is characterized in that the compound fertilizer comprises the following raw material components (by weight portion): 50 to 65 portions of carbamide, 20 to 35 portions of dihydrate gypsum (CaSO4. 2H2O), 10 to 25 portions of phosphorite powder (counted by P2O5), and 8 to 12 portions of additives. The invention provides the long-effect compound fertilizer containing sulfur with high nitrogen, which takes industrial wastes as the raw material components, has high nitrogen content, contains S, Ca, P and other trace elements, and has good compatibility with the market-sold fertilizer. The compound fertilizer has the functions of slow release, durable fertilizer effect, high utilization rate, soil improvement and environment protection. The invention also provides the production method, which has the advantages of easy granulation, simple production process and low cost. The compound fertilizer and the method solve the technical problem of difficult granulation of the high-nitrogen compound fertilizer and broaden utilization paths for coal-fired boiler flue gas desulfurizing waste residues and wet-process phosphoric acid waste phosphogypsum.
Owner:WUHAN ZHONGDONG PHOSPHATE TECH

High-performance lithium ion battery negative electrode Si@N-C composite material and preparation method therefor

The invention relates to a high-performance lithium ion battery negative electrode Si@N-C composite material and a preparation method therefor. According to the method, gulfweed is used as the raw material to prepare SiO<2> and then reduction is preformed to obtain a Si material; and next, pyrrole is used as the main raw material to coat polypyrrole on the surface of the Si material, and calcining is preformed to obtain the Si@N-C composite material. The raw materials adopted in the method are simple and easily available, low in cost and environment friendly, and toxic and harmful material generation in the preparation process is avoided; in addition, the problem existing in reasonable utilization of gulfweed is solved effectively, and economic efficiency and environment protection are realized; in addition, the silicon material extraction method disclosed in the invention has certain universality for extracting the silicon material form other silicate-containing plants; furthermore, heteroatom N-doped C coating is realized through high-molecular polymer polypyrrole pyrolysis is realized, so that the conductivity and the stability of the Si material are greatly improved, thereby improving the lithium ion battery performance of the Si@N-C composite material.
Owner:SHANDONG UNIV

High-nitrogen biochar composite material as well as preparation method and application thereof

ActiveCN112174136ATo overcome the need to go through two steps of carbonization and activation after productionAchieve continuous generationMaterial nanotechnologyCarbon compoundsElectrical batteryCarbonization
The invention provides a high-nitrogen biochar composite material as well as a preparation method and application thereof. The preparation method comprises the following steps of: taking high-nitrogenbiomass as a carbon source and a nitrogen source, and mixing, washing and modulating the high-nitrogen biomass and acid; putting the obtained solid product into pyrolysis equipment, introducing carbon-containing gas into the pyrolysis equipment to pyrolyze the solid product in a carbon-rich atmosphere, heating the equipment to a preset temperature from room temperature, treating for a period of time, and cooling to room temperature to realize one-step carbonization and activation of the high-nitrogen biomass, thereby obtaining nitrogen self-doped activated biochar; and carrying out metal oxide coating on the nitrogen self-doped active charcoal to obtain the high-nitrogen biochar composite material. One-step carbonization and activation of high-nitrogen biomass are realized by utilizing carbon-containing gas in a non-inert atmosphere, the energy density of a carbon electrode is improved by coating a transition metal oxide, in-situ nitrogen self-doping and functionalization of a biocharstructure are realized, and the high-nitrogen biochar composite material can be used for preparing an electrode of a supercapacitor or an ion battery.
Owner:ZHEJIANG UNIV

Method for increasing nitrogen in refining furnace

The invention provides a method for increasing nitrogen in a refining furnace. The steps of the method is characterized by: (1) blowing in nitrogen with the pressure of not less than 0.5MPa and with the bottom blowing total flow of not less than 500L/min after the completeness of VOD refining furnace reduction or after the completeness of dehydrogenation in VD refining furnace; and (2) calculating the time of nitrogen increasing: a. figuring out the increased nitrogen required by liquid steel: delta N=[N]-[N][before]; wherein, delta N is the increased nitrogen required by liquid steel (%), [N] is the target nitrogen content which the liquid steel needs to achieve after the completeness of each steel ball processing (%), [N][before] is nitrogen content in liquid steel before increasing nitrogen (%); and b. figuring out the time to increase nitrogen: in the nitrogen increasing process, the temperatrue drop of liquid steel is calculated by rendering that y equals to 1.2 DEG C/min-2.0 DEG C/min; the formula is as follows: delta N=1.25*Q*t*10<-188/(T-yt+273)-1.25+0.51gP-1gf>; wherein, Q is the bottom blow total flow (L/min), t is the time to increase nitrogen (min), T is the temperature of liquid steel before increasing nitrogen (DEG C), P is vacuum degree in the furnace (10<5>Pa), and y is the temperature drop of liquid steel in the process of increasing nitrogen (DEG C/min). The method for increasing nitrogen in the refining furnace has low cost.
Owner:SHANXI TAIGANG STAINLESS STEEL CO LTD

Preparation method of nitrogen-doped ordered mesoporous carbon material

The invention discloses a preparation method of a nitrogen-doped ordered mesoporous carbon material. The preparation method comprises the following steps: performing polymerization reaction on 2,4,6-trichloro-1,3,5-triazine and a polyamine compound in an organic solvent, adding an acid-binding agent to neutralize acid generated during polymerization reaction, so as to promote the polymerization reaction; filtering and drying to obtain a carbon-nitrogen material precursor, and performing high-temperature carbonization under inert atmosphere; cooling to room temperature, removing a template agent by utilizing hydrofluoric acid, to obtain the nitrogen-doped ordered mesoporous carbon material. The polymerization process of the precursor is simple and easily controlled and safe, the nitrogen-doped ordered mesoporous carbon material is good in the integration with a template, the porous structure is controllable, the cost is low, and the equipment is simple and convenient in requirement. The method is high in repeatability, and high in reaction yield; the product is good in uniformity, high in nitrogen content, and regular in structure; the whole process is simple and convenient. The prepared nitrogen-doped ordered mesoporous carbon material has porous ducts with ordered heights, large in specific surface area, the apertures are uniformly distributed, and the nitrogen-doped ordered mesoporous carbon material is high in stability, and has wide application prospects in the field of catalytic and electrode materials, and the like.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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