53 results about "Nitrogen Protoxide" patented technology

The invention relates to a process for removing nitrogen monoxide, nitrogen dioxide and nitrous oxide from an exhaust gas stream obtained in a nitration process, comprising: (a) Removing nitrogen monoxide and nitrogen dioxide from the exhaust gas stream by adding an oxygen comprising gas to the exhaust gas stream, oxidizing the nitrogen monoxide in the gas stream to form nitrogen dioxide, thereby obtaining a gas stream depleted in nitrogen monoxide; (b) Washing the gas stream depleted in nitrogen monoxide with water to obtain a gas stream depleted in nitrogen monoxide and nitrogen dioxide; (c) Converting nitrous oxide in the gas stream depleted in nitrogen monoxide and nitrogen dioxide into nitrogen and carbon dioxide and optionally oxygen in the presence of a nitrous oxide reduction catalyst and in the presence of hydrogen cyanide.

The invention relates to the technical field of catalysts, in particular to a composite catalyst for nitrous oxide decomposition and a preparation method thereof.The composite catalyst is of a three-dimensional flower-shaped structure and comprises a composite carrier and active metal loaded on the composite carrier; the composite carrier is composed of a modification additive and a carrier oxide; the performance additive is composed of alkali metal oxide and rare earth metal oxide; the carrier oxide is selected from one of aluminum oxide, titanium dioxide and silicon dioxide; the active metal comprises cobalt oxide and vanadium oxide. The multi-metal catalyst has the advantages that the multi-metal catalyst with a three-dimensional flower-shaped structure is formed by loading cobalt and vanadium active metals on aluminum oxide and under the synergistic effect of alkali metal and rare earth metal, so that the stability and durability of the catalyst in a high-temperature environment are remarkably improved.

The present disclosure relates to ruminant feed additive composition comprising a combination of urea, biuret and N-containing by-products of the biuret production out of urea, and optionally one or more nitrate compounds, to inhibit methane production emanating from the activities of the digestive tract of ruminant animals, the composition comprising one or more other methane inhibition compounds, chosen out of the group consisting of halogenated methane analogues in the form of halogenated aliphatic compounds with 1 or 2 carbons (also called C1-C2 hydrocarbons) and halocarbon compounds, nitro compounds, plant secondary metabolites (PSM), seaweed, algae, lichen, and / or fungi, dietary lipid and / or fatty acids, The present disclosure further relates to the use of such a ruminant feed additive composition to inhibit methane emissions from digestive activities of ruminant animals and additionally mitigate the amount of nitrous oxide (N2O) and ammonia (NH4) in the urine of the ruminant animal. The present disclosure also relates to a method for inhibiting the production of methane emanating from the digestive activities of ruminant animals, wherein the method comprises the step of orally administering to the ruminant animal an effective amount of such a ruminant feed additive composition.

The present invention relates generally to nitrification inhibitors and their use to prevent nitrate leaching or nitrous oxide emissions and to increase forage or crop yield. The present invention also relates to nitrification inhibitors and formulations comprising the same for direct or indirect application to soil or pasture.

To provide an exhaust gas treatment system capable of decomposing nitrous oxide in exhaust gas with high efficiency.SOLUTION: An exhaust gas treatment system 1 comprises an exhaust passage 10, a first catalyst device 11, a second catalyst device 21, and a third catalyst device 31. The first catalyst device 11 is arranged upstream of the second catalyst device 21. The first catalyst device 11 also has a first catalyst 12 that decomposes ammonia, and a dummy catalyst 13 that does not decompose ammonia. The first catalyst 12 includes a first active metal that decomposes ammonia, and a first carrier that carries the first active metal. The dummy catalyst 13 includes a dummy carrier that does not carry the first active metal.SELECTED DRAWING: Figure 1

The invention discloses a novel method for manufacturing p-type poly, which comprises the following steps of: providing a substrate, putting the substrate into a reaction cavity, and introducing 30000-40000 sccm of oxygen at the temperature of 500-700 DEG C or introducing 5000-20000 sccm of nitrous oxide gas at the temperature of 200-700 DEG C, so that a tunneling oxide layer Tunnel SiOx with the thickness of 0.1-2 nm grows on the back surface of a battery piece; the preparation method comprises the following steps of: adding nitrogen oxide or nitrous oxide into a substrate, removing oxygen or nitrous oxide at the temperature of between 200 and 700 DEG C, and introducing mixed gas of 3000 to 4000sccm of silane, 100 to 1000sccm of borane and 2000 to 20000sccm of hydrogen, so that a bottom layer Poly with the thickness of between 5 and 100nm grows on the substrate; the preparation method comprises the following steps of: removing mixed gas of silane, borane and hydrogen at the temperature of between 200 and 700 DEG C, introducing oxygen at the temperature of between 30000 and 40000 sccm or nitrous oxide gas at the temperature of between 5000 and 20000 sccm, and generating a silicon oxide (SiOx) multifunctional laminated layer with a certain thickness of between 0.5 and 30 nanometers. According to the method, the original p-type Poly layer is initially prepared in a PECVD mode, and then auxiliary doping is carried out through laser and annealing processes so as to accurately control the effective doping concentration of boron atoms.

A gas decomposition catalyst, a method for decomposing nitrous oxide gas by using the gas decomposition catalyst, and a cleaner system for decomposing nitrous oxide gas by using the gas decomposition catalyst. The gas decomposition catalyst includes a perovskite oxide host material containing a B'element and represented by Formula 1, and at least one B 'element protruding particle derived from some or all of the B' element, wherein the B'element protruding particles have a shape in which a portion of the particles is fixed inside the perovskite oxide host material and another portion of the particles protrudes from a surface of the perovskite oxide host material, where A, B, B ', x, and y in Formula 1 are as described in the detailed description. .

The invention belongs to the technical field of nitrous oxide preparation equipment, and particularly relates to an efficient heat exchange device for nitrous oxide preparation and a method thereof.The efficient heat exchange device comprises a snakelike bent pipe arranged on a fin heat exchanger body, a discharging end is arranged at one end of the snakelike bent pipe, and the other end of the snakelike bent pipe is fixedly communicated with a first Y-shaped pipe; the two ends of the first Y-shaped pipe are fixedly communicated with second Y-shaped pipes through straight pipes. According to the invention, through the innovative locking trigger sealing assembly, after the filter screen cylinder is oppositely inserted into the packaging cylinder, the pre-positioned filter screen cylinder can be further locked, and further sealing between the sealing plug and the inlet at the bottom end of the packaging cylinder is synchronously realized at the locked rear section, so that the air tightness of the system is ensured, and the leakage of nitrous oxide gas is prevented; the pre-positioning ensures that the filter screen cylinder is not easy to fall off in the process of being fed into the packaging cylinder, and meanwhile, the filter screen cylinder is further locked after being fed into the packaging cylinder.

This nitrous oxide decomposition catalyst contains a compound represented by formula (1). In formula (1), A is at least one selected from the group consisting of Fe, Mn, Ce, Zr, La, alkali metals and alkaline earth metals, and X is greater than 0 and less than 1.

The invention belongs to the field of environmental catalysis and molecular sieve materials, and particularly relates to a copper-based SUZ-4 molecular sieve catalyst for N2O decomposition as well as a preparation method and application of the copper-based SUZ-4 molecular sieve catalyst. The preparation method comprises the following steps: preparing an HSUZ-4 molecular sieve with adjustable crystal size by regulating and controlling silicon source hydrolysis and aluminum source dissolution processes, carrying out hydrothermal post-treatment on the molecular sieve by adopting a mixed solution of nitric acid and copper salt, and preparing a Cu-HSUZ-4 precursor through acid etching, ion exchange and anchoring; and carrying out reduction treatment to realize controllable adjustment of the Cu < + > / Cu < 2 + > ratio, thereby obtaining the catalyst. Copper species in the catalyst mainly exist in the forms of monodisperse ions, Cu ion clusters and sub-nano CuxOy, a metal-acid synergistic active center is jointly constructed by the copper species and reserved Bronsted acid sites, breakage of N-O bonds is effectively promoted, efficient decomposition of N2O can be achieved within 350-500 DEG C, and the catalyst has excellent poison resistance.

The present disclosure pertains to a molecule that is operable to release a nitroxyl (HNO) upon irradiation. The nitroxyl may be operable to convert to nitrous oxide (N2O). The present disclosure also pertains to methods of releasing nitroxyl from a molecule of the present disclosure by irradiating the molecule. The released nitroxyl may then convert to nitrous oxide. The present disclosure also pertains to methods of administering at least one of nitroxyl or nitrous oxide to a subject by (1) administering a molecule of the present disclosure to the subject; and (2) irradiating the molecule, where the irradiation results in the release of nitroxyl from the molecule. The released nitroxyl may then convert to nitrous oxide.

The invention relates to a catalyst for the decomposition or selective catalytic reduction of N2O and / or NO. xcomprising a reducing agent in the form of a shaped body, comprising: an active material containing a zeolite of structure type CHA loaded with an iron component, wherein the zeolite has a SiO2 / Al2O3 ratio between 5 and 20, and a binder, characterized in that the iron component contains an amount of 1 wt.% to 10 wt.% Fe2O3 based on the total weight of the catalyst, and the iron component has been introduced into the zeolite of structure type CHA by solid ion exchange.The invention also relates to a process for producing a catalyst according to the invention, comprising the steps: a) mixing a zeolite of the CHA structural type with an iron precursor in solid form to obtain a precursor mixture, b) calcining the precursor mixture from step a) to obtain the active material, c) mixing the active material from step b) with a binder and optionally further components to obtain an extrudable mixture, d) extruding the mixture from step c) to obtain shaped bodies, and e) calcining the shaped bodies from step d).

To solve the following problem that: an exhaust gas purification catalyst for ammonia engines is contacted with unburned ammonia (NH3) and nitrogen oxides (NOx) contained in exhaust gas, which are then purified into nitrogen (N2) and water (H2O); however, during this purification by the exhaust gas purification catalyst for ammonia engines, nitrous oxide (N2O), known as a greenhouse gas, is generated and discharged, and thus to provide a novel exhaust gas purification catalyst for ammonia engines that can purify unburned ammonia (NH3) as exhaust gas and suppress nitrous oxide (N2O) emission.SOLUTION: An exhaust gas purification catalyst for an ammonia engine comprises rhodium and / or platinum 212, wherein the content of palladium is 1.0 mass% or less and the content of barium is 1.0 mass% or less.SELECTED DRAWING: Figure 1

This method for producing a nitrous oxide decomposition catalyst which is for decomposing nitrous oxide in an exhaust gas comprises: a preparation step for preparing a slurry containing an active component, an inorganic binder, and a dispersant; and an application step for applying the slurry to a base material. The inorganic binder contains a metal hydroxide, and the dispersant contains a carboxylic acid and / or water.

The utility model discloses nitrous oxide gas cylinder airtightness detection equipment which comprises a water storage tank, the side wall of the water storage tank is fixedly connected with a pair of hydraulic cylinders, the tops of the pair of hydraulic cylinders are jointly and fixedly connected with a supporting plate, the top of the supporting plate is fixedly connected with a pair of first sliding rails, the pair of first sliding rails are of a symmetrical structure, and the pair of first sliding rails are arranged on the supporting plate. A two-way screw is rotationally connected into the first sliding rail, a pair of clamping plates is in threaded connection with the middle of the two-way screw and is of a symmetrical structure, the side wall of the water storage tank communicates with a water inlet pipe and a water drainage pipe, the height of the water inlet pipe is larger than that of the water drainage pipe, and a transmission assembly and a buffering assembly are arranged at the top of the supporting plate. The two-way screw rod is arranged to be connected with the clamping plate, so that the gas cylinder can be conveniently fixed when the gas cylinder is detected, the stability of the position of the gas cylinder is improved, and the situation that the detection result is influenced by bubbles caused by position movement of the gas cylinder in the water body is reduced.

A process for the explosion-proof storage of nitrous oxide in the liquid phase in a container comprising filling the container with nitrous oxide and an inert component selected from nitrogen, oxygen, carbon dioxide, water, argon, helium, krypton, xenon and mixtures thereof, and keeping it at a temperature of 190 to 273 K, wherein (i) the container has in all three spatial directions an inner distance between two opposite interior walls of ≥10 cm, (ii) the concentration of the inert components comprises 2 to 20 wt.-% in total, based on the nitrous oxide in the liquid phase, and (iii) compounds selected from—gases having a flammable range with air at 293.15 K and 101.3 kPa abs,—liquids having a flash point of ≤366.15 K at 101.3 kPa abs, and—mixtures thereof are kept at 0 to 2 wt.-% in total, based on the nitrous oxide in the liquid phase.

The invention discloses a carbon quantum dot-biological hybrid and a preparation method and application thereof.Comamonas testosteroni N1 with the preservation number of GDMCC NO.65211 is selected, carbon quantum dots are prepared from the Comamonas testosteroni N1 treated with nitrogen-containing waste water and mixed with a Comamonas testosteroni bacterial solution, the carbon quantum dot-biological hybrid is prepared, and the carbon quantum dot-biological hybrid is used for preparing the carbon quantum dot-biological hybrid with the preservation number of GDMCC NO.65211. And the catalyst is applied to sewage denitrification treatment. The hybrid can realize one-step removal of ammonia nitrogen under an aerobic condition, so that the time required by traditional denitrification is shortened, and the generation of an intermediate product nitrous oxide (N2O) during denitrification by using a single strain is also reduced. According to the technology provided by the invention, the problems of high energy consumption and complex process of traditional biological denitrification are effectively solved, and meanwhile, an efficient, economical and safe microbial hybrid denitrification technology is provided.

The present invention includes a Data-Logging Sensor Integration Block (DLSIB) system for real-time respiratory data for use with humans and animals comprising at least one chamber comprising an interior, an inlet and outlet for air, wherein two or more sensors are in fluid communication with the interior of the at least one chamber, wherein the two or more sensors are selected from a nitric oxide sensor, a nitrous oxide sensor an oxygen sensor, an ozone sensor, a carbon dioxide sensor, a carbon monoxide sensor, a pressure sensor, a temperature sensor, a humidity sensor a mass flow rate sensor, an SpO2 sensor, or a PaCO2 sensor; and a processor connected to each of the two or more sensors, and wherein the DLSIB system measures in real-time or internally records outputs from the two or more sensors for each breath of a subject.

The application provides a multi-level hole catalyst for benzene oxidation to prepare phenol and a preparation method and use thereof, and the preparation method comprises the following steps: (1) a catalyst raw material containing a pore modifier is subjected to a hydrothermal synthesis reaction, and a precursor obtained is subjected to a first calcination to obtain a first molecular sieve containing micropores and mesopores; (2) the first molecular sieve is sequentially subjected to an alkaline modification treatment and a second calcination to obtain the multi-level hole catalyst for benzene oxidation to prepare phenol. The application has a typical multi-level hole structure under the premise of ensuring sufficient acidity, the maximum pore diameter of the molecular sieve is increased from 10 nm to 100 nm, the desorption efficiency of the phenol product on the catalyst can be increased, the anti-coking performance of the catalyst is significantly improved, the service life of the catalyst is prolonged, and the catalyst can be well applied in the reaction of preparing phenol by oxidizing benzene with nitrous oxide.

The invention provides a temperature closed-loop control method and system for a nitrous oxide propulsion self-pressurization storage box, and relates to the technical field of spacecraft propulsion system.The method comprises the steps that nitrous oxide concentration, pressure, propellant temperature distribution, spacecraft task stages and propellant surplus data in the storage box are obtained, and the nitrous oxide concentration, pressure, propellant temperature distribution, spacecraft task stages and propellant surplus data are obtained; calculating the power adjustment amount of each partition of the external heating layer based on the concentration and temperature data, and generating a partition control instruction; the partition power output is adjusted by executing the instruction, and a temperature field matched with a preset condition is formed in the storage box; then cooperatively optimizing the temperature field and the pressure data to generate an optimized power distribution proportion; then, the task stage and the propellant remaining amount are processed in a rolling mode, and a temperature control parameter track is generated; and finally, fusing the power distribution result and the parameter track to form a comprehensive control strategy containing an updating instruction. According to the method, the efficiency of the nitrous oxide self-pressurization system in the propellant phase change dynamic process in an on-orbit task is improved.

The invention discloses a stable isotope mass spectrometry system based on reduction reaction, which is applied to the field of stable isotope mass spectrometry, and is characterized in that a first sample introduction module continuously introduces inert gas into an oxidation module, and the inert gas enters a gas mixing module through the oxidation module; the second sample introduction module introduces to-be-detected gas into the gas mixing module, the to-be-detected gas and the inert gas pass through the reduction module together and are introduced into the stable isotope mass spectrometer, and the isotope ratio of the to-be-detected gas is obtained; the first vacuum module is used for enabling the gas mixing module to be in a vacuum state before the inert gas and the gas to be detected enter the gas mixing module; the second vacuum module is used for enabling the reduction module to be in a vacuum state before the inert gas and the to-be-detected gas enter the reduction module. According to the method, the isotope calibration cost of nitrogen, nitrous oxide, nitric oxide and carbon dioxide is effectively reduced, and the method is suitable for isotope calibration of most laboratories.

A catalyst for removing nitrous oxide and a method of removing nitrous oxide are provided. The catalyst includes a metal oxide powder and an iron-copper compound. The iron-copper compound is attached to the surface of the metal oxide powder, where the metal oxide powder includes zinc oxide, magnesium oxide, aluminum oxide, or a combination thereof. A molar ratio of iron in the iron-copper compound to the metal in the metal oxide powder is 1:1.3-4.0.

An exhaust gas treatment device for treating exhaust gas generated by combustion of fuel, the exhaust gas treatment device being provided with: a first denitration catalyst for reducing nitrogen oxides in the exhaust gas; and one or more catalyst units each including an ammonia decomposition catalyst for decomposing ammonia in the exhaust gas, the ammonia decomposition catalyst being provided on the downstream side of the first denitration catalyst in the flow of the exhaust gas, and a second denitration catalyst provided on the downstream side of the first denitration catalyst in the flow of the exhaust gas. The second denitration catalyst is disposed on the downstream side of the ammonia decomposition catalyst in the flow of the exhaust gas and reduces nitrogen oxides in the exhaust gas, and the ratio of the concentration of ammonia (CN3FSCR) at the outlet of the first denitration catalyst to the concentration of nitrous oxide (CN2OSYS) at the outlet of the one or more catalyst units (CN3FSCR / CN2OSYS) is 10.0 or more.

The present invention discloses an adsorbent for capturing and separating nitrous oxide, and its preparation method and application. The preparation method comprises: adding an acid anhydride compound, a polyamine compound, a crosslinking agent, and a catalyst to a reaction solvent under a protective gas atmosphere to carry out a reaction; obtaining a precipitate after the reaction is completed, separating, washing, and drying to obtain the adsorbent for capturing and separating nitrous oxide; the acid anhydride compound is a compound containing two or more carboxylic anhydride functional groups; the polyamine compound is a compound containing two or more NH2 functional groups; the crosslinking agent is triaminopyrimidine; and the catalyst is isoquinoline. The present invention uses an acid anhydride compound, a polyamine compound, and triaminopyrimidine as raw materials, and crosslinks and polymerizes them through an imidization reaction. The reaction conditions are simple and easy to control, the cost of the reaction raw materials is low, and an adsorbent with different pore structures can be produced. The adsorbent can capture and separate N2O from mixed gases by simple, low-consumption, and high-efficiency pressure swing adsorption.

A gas decomposition catalyst, a method of decomposing nitrous oxide gas by using the gas decomposition catalyst, and a scrubber system for decomposing nitrous oxide gas by using the gas decomposition catalyst. The gas decomposition catalyst includes a perovskite oxide host material containing a B′ element and represented by Formula 1, and at least one B′ element protruding particle derived from some or all of the B′ element, where the B′ element protruding particle has a shape in which a portion of the particle is fixed inside the perovskite oxide host material and another portion of the particle protrudes from the surface of the perovskite oxide host material:where A, B, B′, x and y in Formula 1 are as described in the detailed description.

An apparatus for catalytic decomposition of nitrous oxide in a gas stream derived from exhalation air from a patient. The apparatus comprises a casing housing a catalyst bed comprising a catalyst material promoting the decomposition of nitrous oxide. The casing comprises a gas inlet for a first gas stream derived from exhalation air from a patient. The casing comprises a gas outlets. The apparatus comprises one or more tubular members. The casing houses at least a portion of the tubular member. The tubular member comprises a gas inlet for a second gas stream comprising at least a portion of the first gas stream. The tubular member comprises a gas-permeable wall so as to provide one or more third gas streams from the tubular member to the catalyst bed. The third gas stream comprises at least a portion of the second gas stream.

This method for producing a nitrous oxide decomposition catalyst for decomposing the nitrous oxide in an exhaust gas comprises a preparation step for preparing a product that contains the following: an active component containing the composite metal oxide represented by formula (1); and an impurity component containing an alkali metal element. The product containing the active component and impurity component is prepared in the preparation step by a coprecipitation method using a coprecipitation agent containing an alkali metal element. In the product, the percentage content of alkali metal element with reference to the total main element amount in the active component and impurity component is at least 0.45 mass% and not more than 4.50 mass%.　(1): NiXA1-XCo2O4 (In formula (1), A is at least one selected from the group consisting of Fe, Mn, Ce, Zr, La, and alkaline earth metals. In addition, X is greater than 0 and less than 1.)

The nitrogen oxide emission reduction system according to an exemplary embodiment of the present invention provides a system that links selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) methods. This effectively removes nitrogen oxides and nitrous oxide contained in exhaust gases generated from ammonia combustion. In particular, by optimizing the content of nitrogen oxides and reducing agents, the removal efficiency of nitrogen oxides and nitrous oxide can be further improved.

To solve the following problem that: an exhaust gas purification catalyst for ammonia engines is contacted with unburned ammonia and nitrogen oxides contained in exhaust gas, which are then purified into nitrogen and water; however, during this purification by the exhaust gas purification catalyst for ammonia engines, nitrous oxide, known as a greenhouse gas, is generated and discharged; and this drawback becomes a particular concern when the exhaust gas composition changes at high temperature; and thus to provide a novel exhaust gas purification catalyst for ammonia engines that can purify unburned ammonia as exhaust gas in oxygen-deficient atmospheres and suppress nitrous oxide emission in oxygen-excess atmospheres, under atmospheric variation between oxygen-deficient and oxygen-excess atmospheres at high-temperature.SOLUTION: An exhaust gas purification catalyst for an ammonia engine comprises ruthenium and / or nickel oxide.SELECTED DRAWING: Figure 1

The present invention relates to the production of a recombinant plasmid as a vector for introducing repair sequences into nitrogen-fixing bacterial cells incapable of expressing nitrous oxide reductase. Successful insertion of the recombinant plasmid leads to restoration of the inactive operon, preventing the release of the greenhouse gas nitrous oxide (N₂O) during the denitrification process. The resulting mutant strain exhibits the same agronomic efficiency as the original strain, but with the added benefit of significantly reducing N₂O emissions, contributing to a more sustainable approach to agriculture and food production. Additional aspects of the present invention relate to primer pairs, nucleotide sequences, modified microorganisms, as well as methods for the preparation thereof.