78results about "Nitrogen preparation" patented technology

The invention relates to an adsorbent for nitrogen production and a preparation method thereof, and belongs to the technical field of air nitrogen production. The technical problem to be solved by the invention is to provide a low-cost preparation method of the adsorbent for nitrogen production, and a carbon molecular sieve is modified by orthosilicate, so that the adsorbent has a very good adsorption effect. The method comprises the following steps: a, mixing and molding: mixing orthosilicate and phenolic resin, and extruding and molding into particles; and b, carbonizing: heating the particles obtained in the step a to 700-1000 DEG C under a protective atmosphere, and carbonizing to obtain the adsorbent for nitrogen production. The adsorbent for nitrogen production is prepared by mixing the orthosilicate and the phenolic resin, the method is simple, oxygen can be well adsorbed, nitrogen and oxygen can be well separated, the adsorbent can be used for preparing nitrogen through pressure swing adsorption, and the nitrogen production efficiency is high.

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 discloses a nickel-based ammonia decomposition catalyst as well as a preparation method and application thereof. The nickel-based ammonia decomposition catalyst comprises a carrier, an active component and an auxiliary agent, the active component is loaded on the carrier, and the auxiliary agent is loaded on the carrier containing the active component; the active component comprises an active component I and an active component II; the active component I is Ni, and the active component II is selected from Fe and / or Co; the auxiliary agent is alkali metal oxide; alkali metal in the alkali metal oxide is selected from at least one of Li, Na, K, Rb and Cs. Compared with the nickel-based catalyst used in the industry at present, the catalyst prepared by the method provided by the invention shows higher catalytic activity and stability in ammonia decomposition reaction, and the ammonia decomposition temperature can be reduced by 150-200 DEG C. When the gas production rate is the same, the loading amount of the catalyst and the equipment volume are greatly reduced, and the ammonia decomposition energy consumption is obviously reduced.

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.

A nitrogen oxide decomposition catalyst, a catalytic reaction system including the same, and an air purification system, wherein the nitrogen oxide decomposition catalyst includes a heterogenous metal oxide and a first metal disposed on the heterogenous metal oxide and is configured to catalyze a reaction to decompose nitrogen oxides into nitrogen and oxygen.

The embodiment of the invention relates to the technical field of flue gas denitrification, and provides a method for producing ammonia gas by using a nitrogen element in boiler flue gas, nitrogen oxide in the boiler flue gas is reduced into high-temperature nitrogen, and then hydrogen is introduced to react with the high-temperature nitrogen to produce ammonia gas, so that the effect of producing the ammonia gas while removing the nitrogen oxide in the boiler flue gas is realized, and the ammonia gas production efficiency is improved. The nitrogen oxide in the boiler flue gas is reduced, the ammonia gas is prepared by using the reduced nitrogen and the residual heat in the boiler flue gas, and the waste of the nitrogen after high-temperature reduction is reduced.

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.

A method for converting excess liquid oxygen into liquid nitrogen, including introducing a gaseous nitrogen stream into a main heat exchanger, therein exchanging heat with a vaporized oxygen stream, a vapor phase nitrogen steam, and a waste liquid nitrogen stream; thereby producing a cold gaseous nitrogen stream, an oxygen vent stream, a nitrogen vent steam, and a gaseous nitrogen waste stream, introducing the cold gaseous nitrogen stream into a secondary heat exchanger, therein exchanging heat with a liquid oxygen stream; thereby producing the vaporized oxygen stream and a cold liquid nitrogen stream, introducing the cold liquid nitrogen stream into a nitrogen pressure reduction valve thereby producing a two-phase nitrogen stream, introducing the two-phase nitrogen stream into a nitrogen flash vessel thereby producing a liquid phase nitrogen stream and the vapor phase nitrogen stream, wherein the method is performed in the absence of refrigerant turbo-expanders, refrigerant expansion turbines, or refrigerant compressors.

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 invention discloses an atomic polymerization nitrogen material and a preparation method thereof, belongs to the technical field of energetic materials, and solves one of the following problems: (1) conditions for synthesizing cg-PN are relatively harsh; and (2) the content of cg-PN prepared by the prior art is low. According to the preparation method disclosed by the invention, the azide is directly quenched from high temperature to room temperature under high pressure to obtain the atom polymerization nitrogen material. The cg-PN prepared by the preparation method disclosed by the invention is high in yield, can be recycled under conventional conditions, and has potential application value in the field of energetic materials.

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.

The invention provides a method and a system for the simultaneous removal of pollutant gases CO2 / NOx / SOx from exhaust gas using multiplex catalytic DEMOP techniques provided by the MCH media, the AMPE wave treatment, the magnetic field created by spray action, and the waste heat energy.

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.

CATALYST, IN PARTICULAR FOR CRACKING AMMONIA, PROCESS FOR PREPARING THE CATALYST AND PROCESS FOR SYNTHESIZING HYDROGEN Catalyst for the decomposition of ammonia into hydrogen and nitrogen, said catalyst comprising at least ruthenium, mesoporous cerium oxide and at least one oxide chosen from cobalt, nickel and iron oxides, preferably nickel oxide and process for producing hydrogen from ammonia comprising the following steps in this order: activation of at least one catalyst according to the invention at a temperature ranging from 300°C to 600°C, under a flow of a reducing gas; contacting said activated catalyst with a gas to be treated comprising ammonia at a temperature ranging from 200°C to 800°C, and at a pressure ranging from atmospheric pressure to 100 bar. Figure for abstract: Fig. 3

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 invention discloses a rapid purification device for high-purity gas production. Relates to the technical field of nitrogen production. In the process that a filter screen in the nitrogen making machine blocks dust and impurities, part of dust and impurities with certain viscosity can be adsorbed on the surface of the filter screen, and the dust and impurities are accumulated for a long time to block the filter screen. The nitrogen making machine comprises a nitrogen making machine body, a filter screen, an air inlet pipe, a cleaning part and a collecting frame, the filter screen is fixedly arranged in the nitrogen making machine body, and the air inlet pipe is fixedly arranged on the outer wall of the nitrogen making machine body. The vibration frame can be driven to move by starting the lead screw sliding table, the vibration frame can drive the cleaning plate to move to clean the surface of the filter screen, and therefore the situation that the filter screen is blocked is reduced, and the vibration frame can horizontally move under the influence of the rolling wheels and the corrugated rods in the vertical movement process; the horizontal movement of the vibration frame enables the cleaning plate in the vibration frame to perform high-frequency horizontal movement, and the cleaning effect of the cleaning plate on the filter screen is improved through vibration.

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 discloses a preparation method and application of a copper-aluminum composite oxide rich in acid sites. The copper-aluminum composite oxide is used for selective catalytic oxidation of NH3. The catalyst obtained by calcining the aluminum-doped malachite precursor synthesized by taking urea as an additive has more acidic sites and higher catalytic activity; the method is mainly characterized in that in the process of synthesizing aluminum malachite by using urea as a precipitator, the surface of Al2O3 is more easily hydroxylated, and then hydroxyl is reversibly adsorbed on the surface of Al2O3, so that the adsorption sites of NH3 are increased, and the acidic sites of the catalyst are enhanced; secondly, an organic solvent is used for soaking, the organic solvent in the supported catalyst promotes CuO species to exist in a multi-layer covering mode, interaction between the CuO species and gamma-Al2O3 support is weakened, and therefore reduction of the CuO species is promoted, the oxidation-reduction performance of the catalyst is enhanced, and the overall catalytic activity is improved.

The invention relates to a catalyst for the decomposition of ammonia into hydrogen and nitrogen, wherein the catalyst comprises at least ruthenium, mesoporous cerium oxide and at least one oxide selected from among cobalt, nickel and iron oxides, preferably nickel oxide, and to a method for producing hydrogen from ammonia comprising the following steps in this order: activating at least one catalyst according to the invention at a temperature ranging from 300°C to 600°C under a stream of a reducing gas; bringing the activated catalyst into contact with a gas to be treated comprising ammonia at a temperature ranging from 200°C to 800°C, and at a pressure ranging from atmospheric pressure to 100 bar.