60results about "Nitrogen preparation" patented technology

A method for decomposing ammonia (NH3) to hydrogen (H2) and nitrogen (N2) includes contacting a H2-containing feed gas stream with a carbon material supported metal (M-C) catalyst at a temperature of about 500° C. to form a reduced M-C catalyst; contacting an NH3-containing feed gas stream with the reduced M-C catalyst at a temperature of about 200 to about 600° C. thereby converting at least a portion of the NH3 to H2 and N2, and regenerating the M-C catalyst to form a regenerated M-C catalyst, and producing a residue gas stream leaving the reactor; and separating the H2 from the residue gas stream to generate a H2-containing product gas stream. The regenerated M-C catalyst is substantially free of agglomerated particles and sintered particles.

The invention belongs to the technical field of ocean engineering drag reduction, and relates to a self-adaptive chemical gas production underwater drag reduction layer and a preparation method thereof.The surface of an aircraft is regarded as a gas production place and transformed into an intelligent interface with sensing and feedback capabilities, inert gas generated by reaction of reactants is detained and utilized in situ through microstructure design, and the self-adaptive chemical gas production underwater drag reduction layer is obtained. The independent micro chamber structure avoids diffusion of local failure, the macroscopic flow guide structure relieves the problem of non-uniform gas film distribution, external energy input is not needed, the chemical reaction rate is reversely and adaptively regulated and controlled based on the physical effect generated by gas retention, and therefore a closed-loop passive self-adaptive resistance reduction film layer is formed. Reaction byproducts are environment-friendly water-soluble sodium chloride and water and are removed in a pulse type reaction mode of high-speed water flow scouring and gas retention, so that the risk of permanent blockage is reduced, safety and environment friendliness are achieved, the energy utilization efficiency is high, meaningless waste of gas is avoided, and the cruising ability of fuel is equivalently and greatly improved.

The present invention discloses an atomically polymerized nitrogen material and a preparation method thereof, belonging to the technical field of energetic materials, and solves one of the following problems: (1) the relatively harsh conditions for synthesizing cg-PN; and (2) the low content of cg-PN prepared by the prior art. The preparation method of the present invention obtains the atomically polymerized nitrogen material by directly quenching an azide compound from a high temperature to room temperature under high pressure. The cg-PN prepared by the preparation method of the present invention has high yield and can be recovered under conventional conditions, and has potential application value in the field of energetic materials.

The application provides a hydrogen-ammonia engine combustion and NO x The application relates to a control technology field of a combustion engine, and discloses a synergic control system and a control method, which comprise a controller and a fuel distribution subsystem, an ignition subsystem and an aftertreatment subsystem connected with the controller, wherein the ignition subsystem at least comprises a jet ignition device; the fuel distribution subsystem at least comprises an ammonia fuel storage device, a catalytic decomposer and a hydrogen purification device, the hydrogen purification device is connected with a first supply subsystem and a second supply subsystem, the first supply subsystem is connected with the jet ignition device, the second supply subsystem is connected with the aftertreatment subsystem; and the aftertreatment subsystem at least comprises a primary SCR device and a secondary SCR device connected with the primary SCR device. The application solves the problems that the proportion of hydrogen-ammonia mixed fuel and the combustion process cannot be effectively controlled in the prior art, the engine combustion efficiency is low, and nitrogen oxide emission does not meet the standard.

A method for operating a turbomachine (10) includes directing a stream of ammonia vapor to one or more hot gas path components (300) of the turbomachine (10). This transfers heat from the one or more hot gas path components (300) to the ammonia vapor. The method also includes cracking the ammonia vapor using the heat from the one or more hot gas path components (300), producing hydrogen gas and nitrogen gas. The method further includes directing the hydrogen gas produced by cracking the ammonia vapor to a combustion chamber (24) of the turbomachine (10).

The invention discloses a confinement nitrogen-doped carbon-based denitration catalyst with a layered stacking structure and a preparation method of the confinement nitrogen-doped carbon-based denitration catalyst. The preparation method comprises the following steps: 1) preparing an LDH material with high adsorption performance; 2) adsorbing nitrogen-containing organic matters by using an LDH material with high adsorption performance so as to prepare a reaction product LDO-C; and 3) performing hydrochloric acid hydrothermal treatment on the reaction product LDO-C, and eluting the LDH layered structure, thereby preparing the nitrogen-doped confinement carbon material with the layered stacking structure. The nitrogen-containing organic matter is used as a carbon source and a nitrogen source, LDH is used as a template, the cost is low, and the preparation process is simple and convenient.

The application discloses a method and system for treating high-concentration nitrogen oxide waste gas. The method is characterized in that high-concentration nitrogen oxide waste gas is mixed with natural gas, and then burned to generate high-temperature atmosphere, so that the nitrogen oxide is converted into nitrogen. The application has the advantages of environmental protection, economy, high efficiency and the like.

The invention discloses a method for producing a high-phosphorus-content calcium magnesium phosphate fertilizer by using an industrial byproduct magnesium ammonium phosphate, which comprises the following steps: drying and screening magnesium ammonium phosphate, adding phosphorite, dolomite or serpentine and coke or anthracite, feeding the materials into a smelting furnace according to a ratio, melting and smelting at a high temperature, blowing air or oxygen by an air blower at the smelting temperature of 1400-1600 DEG C for 2-3 hours, and cooling to room temperature to obtain the high-phosphorus-content calcium magnesium phosphate fertilizer. The smelting time is 0.5-4 hours, discharging molten slag from a slag opening of the smelting furnace, and carrying out water quenching to obtain the calcium magnesium phosphate fertilizer; gas generated in the process enters a hot-blast stove along with smelting furnace gas, at the moment, the temperature of a hearth of the hot-blast stove reaches 900-1000 DEG C due to gas combustion, and ammonia reacts with nitrogen oxide in the tail gas to obtain nitrogen and water, and reacts with sulfur dioxide to finally obtain ammonium bisulfate. According to the invention, resource utilization of the industrial byproduct magnesium ammonium phosphate can be realized, the calcium magnesium phosphate fertilizer with high phosphorus content can be obtained, and nitrogen oxides and sulfur dioxide in the tail gas in the production process of the calcium magnesium phosphate fertilizer can be more effectively removed.

The invention provides a graded aperture hydrogen production reactor based on a gate sponge fractal structure. The graded aperture hydrogen production reactor is particularly suitable for efficient, compact and movable hydrogen production scenes in marine environments such as a ship power system taking fluid fuel as a raw material and an offshore hydrogen refueling station. The reactor is provided with a fractal graded aperture reaction cavity constructed based on lattice sponges, a reaction-heat supply integrated structure is integrated, different orders of lattice sponges are communicated with one another through a micro-channel array composed of straight channels or branched channels, and a multi-gradient coordinated regulation reaction area is formed. By virtue of the inherent cross-scale heat and mass transfer strengthening capability of the fractal structure and the self-adaptive matching characteristic of the gradient aperture to a multi-physical field, the conversion efficiency of fluid fuel and the hydrogen yield can be remarkably improved in ocean high-temperature, high-humidity, high-salt and vibration environments, and the comprehensive utilization efficiency of energy is strengthened; the operation stability and the modular expansion capability of the reactor are improved, and the urgent demand of an ocean mobile platform on efficient and reliable hydrogen production equipment is met.

A MnO2 catalyst for efficient catalytic purification of acetonitrile x This paper discusses SiO2@CeO2 catalysts and their preparation methods, belonging to the fields of catalysis chemistry and environmental chemistry. It involves using MnO... x MnO was prepared by loading it onto a SiO2@CeO2 core-shell structure support. x / SiO2@CeO2 catalyst. The preparation method is as follows: silica microspheres are prepared using a method similar to [preparation method], followed by SiO2@CeO2 preparation using a urea decomposition and precipitation method. The above steps are repeated to adjust the CeO2 loading. MnO is then impregnated using an impregnation method. x MnO was prepared by loading the sample onto the surface of a core-shell SiO2@CeO2 support and then calcining the sample in a muffle furnace at 450℃ for 3 hours. x / SiO2@CeO2 catalyst. This catalyst features a uniform dispersion of transition metal oxides on the support surface, exhibiting good catalytic purification performance for acetonitrile, and shows significant application potential in the treatment of nitrogen-containing organic pollutants.

To provide at least one of the improvement of the heat resistance of a CHA type zeolite by a method different from conventional methods for improving the heat resistance, a method for producing the CHA type zeolite that improves the heat resistance, and the CHA type zeolite.SOLUTION: A CHA type zeolite is provided in which the ratio of an integrated intensity of the maximum peak having a peak top at a chemical shift of 3.0 to 3.5 ppm to an integrated intensity of the maximum peak having a peak top at a chemical shift of 4.0 to 4.5 ppm is more than 0.12 but not more than 0.5 in the 1H-MAS-NMR spectrum, and the ratio of the maximum peak height of an absorption peak having a peak top at a wave number of 3630 cm-1 or more and 3650 cm-1 or less to the maximum peak height of an absorption peak having a peak top at a wave number of 3590 cm-1 or more and 3610 cm-1 or less in IR spectrum is 0.40 or more and 1.0 or less.SELECTED DRAWING: None

The invention discloses a production method of high-purity fluorine-nitrogen mixed gas, and belongs to the technical field of fluorine chemical industry. The method comprises the following steps: mixing high-purity nitrogen trifluoride and high-purity nitrogen according to a molar ratio of 1: (5.5-10), introducing the mixture into a cracker, reacting at the reaction temperature of 1000-1250 DEG C under the pressure of 0.2-0.7 Mpa until the pressure is not changed any more, cooling the reacted gas through a condenser, introducing the cooled gas into a buffer tank 1, compressing the cooled gas through a compressor, introducing the compressed gas into a de-heavy rectifying tower to remove heavy component impurities, and recovering the heavy component impurities to obtain the high-purity nitrogen trifluoride. And gas extracted from the top of the rectifying tower is introduced into the buffer tank 2, compressed by the compressor and then filled into a steel cylinder. The nitrogen is introduced into the cracking reaction, so that the safety of the reaction can be ensured, meanwhile, the production links of purifying fluorine gas and removing nitrogen impurities after the nitrogen trifluoride is cracked are reduced, the fluorine-nitrogen mixed gas with the preset concentration can be directly produced, the production cost is reduced, the production links are reduced, and the 20% fluorine-nitrogen mixed gas can be directly prepared.

A method for decomposing ammonia (NH3) to hydrogen (H2) and nitrogen (N2) includes contacting a H2-containing feed gas stream with a carbon material supported metal (M-C) catalyst at a temperature of about 500 °C to form a reduced M-C catalyst; contacting an NH3-containing feed gas stream with the reduced M-C catalyst at a temperature of about 200 to about 600 °C thereby converting at least a portion of the NH3 to H2 and N2, and regenerating the M-C catalyst to form a regenerated M-C catalyst, and producing a residue gas stream leaving the reactor; and separating the H2 from the residue gas stream to generate a H2-containing product gas stream. The regenerated M-C catalyst is substantially free of agglomerated particles and sintered particles.

The utility model discloses a novel nitrogen making device which comprises an air compressor, a pre-cooling unit, a purification system and a fractionating tower which are communicated in sequence, raw material air is compressed by the air compressor, cooled by the precooling unit and then enters the purification system; entering a fractionating tower; in a main heat exchanger of the fractionating tower, air exchanges heat with the refluxed oxygen-enriched gas and nitrogen, the temperature is reduced to be close to an air liquefaction point, the air enters a rectifying tower for rectification, and high-purity nitrogen is obtained at the top of the rectifying tower; one part of the high-purity nitrogen serves as product nitrogen, is reheated by the main heat exchanger, is discharged from the fractionating tower and is sent to a user; one part of the obtained liquid nitrogen is output as a product, and the other part of the obtained liquid nitrogen enters the rectifying tower again to serve as reflux liquid; one part of liquid air is throttled, enters the subcooler, is vaporized and then is converged with the expanded oxygen-enriched gas; the rectified liquid nitrogen enters a main heat exchanger through a liquid nitrogen pump to be reheated and serves as another stream of product nitrogen; the device can be used for producing nitrogen with two different pressures.

The utility model discloses a kind of nitrogen making machine noise reduction device, it is related to nitrogen making machine muffler field.The utility model includes the main body of muffler, the inside of the main body of muffler is provided with main sound attenuation pipe, auxiliary sound attenuation pipe, the inside of main sound attenuation pipe is movably installed with spiral blade, the spiral blade is adapted to main sound attenuation pipe, the outer end flange of main sound attenuation pipe is connected with exhaust pipe, the one end of spiral blade close to exhaust pipe is provided with grommet, the utility model passes through spiral blade, high-pressure gas is preferentially into main sound attenuation pipe after entering the main body of muffler, the airflow resistance and flow direction are actively regulated by the through hole on the surface of spiral blade, force airflow to disperse through hole and move along spiral path, to extend gas flow path and residence time under the same flow rate, enhance sound energy attenuation efficiency, spiral blade is fixed by exhaust pipe flange compression, ensure its position stability, avoid displacement or vibration due to airflow impact.

A catalyst bed includes a structure defining a plurality of channels configured to receive flow of fluid to be chemically catalyzed. The plurality of channels are oriented at least partially non-parallel to an overall flow direction of the flow from inputs of the plurality of channels to outputs of the plurality of channels. A catalyst is exposed at an exterior of the structure.

The application discloses a nitrogen ion static electricity removing system for food packaging bags, which comprises a cavity in a tubular shape, which is installed on a packaging machine, a support is fixed in the cavity, an ion generator is installed on the support through screws, mounting holes are arranged on the side wall of the cavity close to the ion generator, nitrogen concentration sensors are installed in the mounting holes through threads, a threaded joint is fixedly connected to the outlet of the cavity, replaceable first nozzles are installed on the threaded joint through threads, and the inlet of the cavity is connected to an external nitrogen generator through a nitrogen pipeline; the nitrogen ion static electricity removing system for food packaging bags can implement ionization operation in a pure nitrogen environment, can perform static electricity removing operation through nitrogen blowing, and can block the generation of ozone from the source; the system is provided with nitrogen concentration sensors in the cavity, can monitor the nitrogen concentration in the cavity in real time, prevents the system from being started in an oxygen-containing environment, and guarantees the quality of products.

It is an object to provide a regenerated denitration catalyst whose denitration performance is restored compared with a denitration catalyst before use, utilizing a spent denitration catalyst, and a method for manufacturing the same. In a regenerated denitration catalyst according to the present disclosure, a spent denitration catalyst including a first titanium oxide as a main component, and a second titanium oxide are mixed. The spent denitration catalyst is already used in a denitration reaction in which nitrogen oxides in a gas are decomposed into nitrogen and water using a reducing agent. The second titanium oxide has a larger specific surface area per unit weight than the first titanium oxide. A content of the second titanium oxide based on a total weight of the first titanium oxide and the second titanium oxide is preferably 10% by weight or more and 90% by weight or less.

The application belongs to the technical field of catalysts, and particularly relates to a structural formula catalyst and application thereof. The structural formula catalyst comprises a catalyst active component, a high-wetting anti-corrosion polymer layer and a corrugated partition layer. The catalyst active component is loaded in fibers on the surface of the polymer layer by means of impregnation coating. Based on the wetting property of the polymer layer, a flowing liquid film is formed on the surface of the polymer layer. The thickness of the liquid film is adjusted by adjusting the wetting property of the polymer layer, so as to control the catalytic reduction reaction process and improve the selectivity of the reaction. The polymer layer and the corrugated partition layer are arranged at intervals, and a polymer layer coated with the catalyst active component is arranged on each side of the corrugated partition layer. The structural formula catalyst provided by the application utilizes the wetting principle to control the entire catalytic reaction process from multiple angles, so as to improve the selectivity of the catalytic reaction.

The invention relates to a method for decontaminating a preform (14) made of thermoplastic material by exposing at least one part of the preform (14) to reactive species (RS) obtained by mixing a precursor agent (AP) with a plasma (P), the plasma (P) being generated by injecting a carrier gas (G) into a reactor (40), characterized in that the mixing of the precursor agent (AP) and the plasma (P) is carried out exclusively outside of the reactor (40) before coming in contact with the preform (14). The invention also relates to a decontamination device (50) for implementing the method.

The present disclosure is directed to renewable pathways to nitrogen production and ammonia (NH3) synthesis that utilize renewable heat as process heat instead of fossil fuels and operates at low to medium pressures (from 0.2-3 MPa). The renewable pathways result in both a decrease or elimination of greenhouse gas emissions as well as avoid the cost, complexity and safety issues inherent in high-pressure processes. Renewable thermochemical looping technology is used that produces nitrogen from air for the subsequent production of ammonia via an advanced two-stage process.

A method comprising: heating a refractory surface in a combustion chamber to produce a heated refractory surface; contacting a stream comprising ammonia with the heated refractory surface to dissociate at least a portion of the ammonia to form nitrogen and hydrogen and produce an at least partially dissociated ammonia stream; and combusting the at least partially dissociated ammonia stream with a primary oxidant to produce an at least partially combusted ammonia stream.

The application discloses a rare earth zirconate supported transition metal catalyst and a preparation method and application thereof. The catalyst is composed of a carrier and a transition metal element active component supported on the carrier; the carrier is at least one selected from cerium zirconate, lanthanum zirconate, praseodymium zirconate, neodymium zirconate, samarium zirconate, europium zirconate, gadolinium zirconate, erbium zirconate and yttrium zirconate; the transition metal element active component is at least one selected from iron element, cobalt element and nickel element; the mass of the transition metal element active component is 0.1-100% of the mass of the carrier, and the mass is calculated according to the mass of the transition metal element.

The disclosure relates to a reaction system and / or a corresponding method. The system (11) comprises at least a primary chamber (12, 31), connected or connectable to an air supply (1) supplying air as reaction gas; and a metal or metalloid supply (16) supplying reaction material in the form of at least one material of a group comprising metal or metalloid. The primary chamber (12, 31) contains a reaction process therein, such as a combustion process, and comprises an exhaust (41) to output burnt or oxidized metal or metalloid oxides. A further exhaust (42) is configured to be connected to a conduit (5) configured to supply residual Nitrogen to a subsequent nitrogen based process. The subsequent Nitrogen based process can comprise storing residual Nitrogen in a storage (23) and / or is defined in or by a second chamber (13, 31) to which the conduit (5) is connectable for Nitrogen supply (6).

The invention provides a waste photovoltaic laminated part pyrolysis and decarburization integrated furnace and an atmosphere partition device thereof, the atmosphere partition device comprises a nitrogen generation system, an atmosphere replacement chamber, a middle cavity and an air curtain flashboard, the atmosphere replacement chamber is respectively connected to a feed port of a pyrolysis cavity and a discharge port of a decarburization cavity, and the atmosphere replacement chamber is connected with the nitrogen generation system. The middle cavity is connected between the pyrolysis cavity and the decarbonization cavity, and the height of the middle cavity is smaller than the height of the pyrolysis cavity and the height of the decarbonization cavity. The air curtain flashboards are respectively connected to the feed port and the discharge port of the atmosphere replacement chamber and the middle cavity, the air curtain flashboards are connected with a nitrogen generation system, and the internal air pressure of the pyrolysis cavity is greater than that of other cavities. The atmosphere in the pyrolysis cavity can be isolated from the outside, external air is prevented from entering the pyrolysis cavity to affect the pyrolysis process, and oxygen and open fire in the decarburization cavity can be prevented from flowing to the pyrolysis cavity in series. By adopting the device, the nitrogen of the nitrogen-making system can be supplied intermittently, so that nitrogen resources can be saved, and the energy consumption of the nitrogen-making system can be reduced.

The present invention discloses a fire extinguishing system and method based on a closed energy storage device for ships. The fire extinguishing system includes a smoke collection system, an ammonia decomposition fire extinguishing system, a seawater circulation fire extinguishing system, a fuel cell, an energy storage device, and the like. Ammonia utilizes the temperature in a fire to decompose ammonia, and the N2 in the decomposed gas is connected to a pressure device to provide injection pressure and raw materials for the fire extinguishing system; the H2 in the decomposed gas is powered by a fuel cell, and the unconsumed electricity is stored in the energy storage device; the CO in the smoke enters a catalytic reactor, and the smoke and CO2 in the catalytic reactor enter the fire extinguishing system as raw materials for fire extinguishing; seawater enters a solid-liquid separation device for separation, and the separated sodium chloride is used as raw material for a dry powder fire extinguisher; the separated water is passed into an insulating and cooling water curtain. The present invention can ensure effective fire extinguishing when a fire occurs while achieving zero carbon emissions of fire pollutants, efficiently utilizing nitrogen oxides produced by ammonia, and realizing energy recycling and sustainable development of resources.

The present disclosure concerns processes for removal of nitrate from nitrate-rich brines, typically selective removal that permits reclaiming the nitrate after such removal.

The present application relates to the field of carbon materials, in particular to a modified high boron and nitrogen phenolic resin-based material, a preparation method and application thereof. The preparation method is to prepare the modified high boron and nitrogen phenolic resin-based material by co-condensation reaction of a modifier, 3-hydroxyphenylboronic acid and formaldehyde and carbonization. The modifier is selected from one of melamine, melamine OAT waste residue and urea. The present application introduces nitrogen-containing groups into the molecular chain segments of phenolic resin to prepare carbon materials with high boron and nitrogen content and high specific surface area. The preparation method is simple and easy to operate, and the carbon material product shows good electrochemical performance. The modified high boron and nitrogen phenolic resin-based material prepared by the present application can be applied to the field of electrode materials or catalytic materials.