18results about "Nitrogen dioxide" patented technology

The invention discloses a process for synthesizing ammonia by coupling low-temperature plasma with electro-catalysis in the field of clean energy and green chemical industry, which comprises the following specific steps: mixing air and water vapor, feeding the mixture into a dielectric barrier discharge reactor, filling the reactor with a multi-stage heterojunction gradient doped carbon coated catalyst, generating active gas containing NOx under pulse high voltage, and condensing and then entering an electrocatalytic reduction unit. And an electro-catalysis product enters a photo-thermal separation module integrated with a Janus type photo-thermal electrode, the temperature of the electrode is locally increased under visible light irradiation, NH3 desorption is promoted, and finally high-purity ammonia is obtained through polyimide membrane separation. The multistage heterojunction gradient-doped carbon-coated catalyst adopted in the process is prepared through multiple steps and contains gradient-doped boron, sulfur and Au nanoparticles on the surface, NOx adsorption, electron transport and sintering resistance are synergistically improved, and efficient ammonia synthesis under mild conditions is achieved.

Disclosed is an apparatus for conversion of ammonia into oxides of nitrogen which may comprise an adiabatic burner (108), a set of platinum / rhodium alloy catalytic gauzes (102A), (102B), and (102C), a waste heat recovery boiler (WHRB) (110), an absorption tower (302A), (302B), (302C), (302D) and (302E), a NaOH tank (306) and a surge tank (304). Further, the adiabatic burner may be configured to carry out catalytic oxidation of air and ammonia, using catalytic gauzes (102A), (102B), and (102C) of platinum / rhodium alloy. Further, the mixture of air and ammonia may be selectively oxidized to oxides of nitrogen, which may be absorbed in an alkali medium in the absorption tower (302A), (302B), (302C), (302D) and (302E), to yield sodium nitrites and nitrates.

The invention relates to a supported carbon-based catalyst, a preparation method and application, the supported carbon-based catalyst catalyzes a hydroxylamine nitrate solution to decompose to obtain a liquid-phase product and a gas-phase product; the loading amount of metal elements in the loaded carbon-based catalyst is 0.1-15 wt%; the metal element is selected from one of Pt, Ru, Rh and Pd; a carrier of the supported carbon-based catalyst is coconut shell activated carbon; the supported carbon-based catalyst is selected from at least one of Pt / C, Ru / C, Rh / C and Pd / C; the liquid phase product is selected from at least one of NH4 < + >, H < + >, NO3 <-> and NO2 <->; the gas phase product is selected from at least one of N2O, N2, NO and NO2. The supported carbon-based catalyst adopted by the invention is suitable for catalytic decomposition of low-concentration HAN, and can realize qualitative or quantitative analysis of gas-phase products and liquid-phase products generated by decomposition.

The present invention relates generally to an ammonia capture system or method comprising plasma NOx and, more particularly to such system and method for ammonia capture comprising a two-tank NOx absorption system. Furthermore the present invention concerns a system to produce ammonium nitrate in solution or as a solid from atmospheric ammonium.

The invention discloses a production process and device for preparing liquid nitrogen tetroxide by recycling nitric oxide. Nitrogen oxides in the tail gas are respectively absorbed by water and alkali liquor to prepare a nitric acid solution and a sodium nitrate-nitrous acid solution; a dilute nitric acid solution and a sodium nitrate and nitrite solution are respectively stored and then mixed to enter a nitric oxide generation tower for reaction to generate nitric oxide gas and a sodium nitrate aqueous solution. The nitric oxide gas is lightly oxidized by using oxygen in the nitric oxide generation tower, then enters the oxidation absorption tower and is heavily oxidized by using concentrated nitric acid, so that the nitric oxide gas is completely converted into nitrogen dioxide gas, and the concentrated nitric acid is used for absorption at the upper section of the oxidation absorption tower to form fuming nitric acid. Fuming nitric acid is heated by steam, and liquid nitrogen tetroxide is produced after condensation. The non-condensable gas contains a small amount of nitrogen oxides, and then passes through a denitration device. By adopting the device and the process, the nitrogen oxide in the recovered waste gas can be effectively ensured to be prepared into liquid nitrogen tetroxide, and the content of the nitrogen oxide in the waste gas outlet is reduced.

The invention relates to a disinfectant preparation method and device, disinfectant preparation equipment, a dish washing machine and a computer readable storage medium. The method comprises the following steps: in response to a disinfectant preparation self-adjusting instruction, obtaining an initial water quality parameter of liquid in a water storage device; determining the operation state and the operation power of each discharge electrode based on the initial water quality parameters; under the condition that the discharge duration of the discharge electrode reaches the preset interval detection duration, obtaining a current water quality parameter, and adjusting the operation state and the operation power of the discharge electrode based on the current water quality parameter and the initial water quality parameter; updating the initial water quality parameter, and returning to obtain the current water quality parameter of the liquid in the water storage device under the condition that the discharge duration of the discharge electrode reaches the preset interval detection duration; and under the condition that the state of the disinfectant preparation equipment reaches the disinfectant preparation ending condition, adjusting the running state of each discharge electrode to stop running. By adopting the method, the overall use reliability of disinfectant preparation equipment can be improved.

The application relates to the technical field of nitrite synthesis, and discloses a synthesis method and a synthesis device of alkyl nitrite. The synthesis method comprises the following steps: firstly, mixing gaseous nitric oxide and gaseous oxygen to obtain a mixture through a first reaction; and then, mixing the mixture with alkyl alcohol to obtain alkyl nitrite through a second reaction. The synthesis method greatly shortens the reaction time, increases the yield of alkyl nitrite, does not have a complicated post-treatment process and a large amount of by-product nitric acid, and is beneficial to cost saving and time saving.

The invention belongs to the technical field of ammonia synthesis, and particularly relates to a method and a system for synthesizing ammonia through plasma coupling thermocatalysis. A method for synthesizing ammonia through plasma coupling thermocatalysis comprises the following steps that raw material gas containing nitrogen and oxygen is converted into gas flow containing nitric oxide through plasma, and nitric oxide source gas is formed after purification; the nitrogen oxide source gas and the hydrogen reducing gas are in contact with a bifunctional catalyst subjected to acid pickling treatment for a thermocatalytic reduction reaction, nitrogen oxide is converted, and ammonia gas is generated; wherein the bifunctional catalyst comprises a platinum metal active component and a barium oxide storage component which are loaded on an alumina carrier.

The present disclosure provides autocatalytic cycles and chemical reactor systems in which the autocatalytic cycles may be conducted. Also provided are methods of identifying the autocatalytic cycles and methods of conducting the autocatalytic cycles, e.g., to produce a desired product. Regarding the methods of conducting the autocatalytic cycles, such a method comprises: carrying out a comproportionation reaction by reacting a first reactant M1 and a second reactant M2 to form a product M3, wherein M1, M2, and M3 each comprise at least one chemical element in common and the product M3 is produced in stoichiometric excess; and carrying out an auxiliary reaction by converting the product M3 to M1 or M2.

A system and a method for reducing nitrogen dioxide (NO2) content of a flue gas are provided. The system comprises a wash column that is designed to receive a flue gas containing nitrogen dioxide and treat the flue gas with a first water stream. The first water stream contains a thiosulfate salt reactant. The thiosulfate salt reactant reacts with the nitrogen dioxide to remove the nitrogen dioxide from the flue gas. The wash column can provide a treated flue gas that is substantially free of nitrogen dioxide, or a treated flue gas that contains less nitrogen dioxide than untreated flue gas.

A method for absorbing nitrogen dioxide from tail gas belongs to the industrial waste gas treatment technology, and comprises four core steps of tail gas pressurization, TSA temperature swing adsorption and impurity desorption, PSA pressure swing adsorption up-to-standard emission, and secondary PSA pressure swing adsorption nitrogen oxide recovery, efficient removal of DMS and DMSO is realized by accurately controlling process parameters and selecting a special adsorbent, and the nitrogen dioxide content of the tail gas is reduced. And deep purification and resource recovery of NO2 are achieved, the content of NO2 in purified tail gas meets the emission standard, the recovered N2O4 is high in purity and recovery rate, no salt-containing wastewater is generated, and remarkable environmental protection benefits and economic benefits are achieved.

Dinitrogen tetroxide (N2O4) is synthesized in an apparatus by the reaction of concentrated nitric acid with copper. Oxygen is applied as a carrier gas to convert NO to NO2, and water vapor is removed with a tube dryer. A molecular sieve is applied to reduce and remove impurities.

The utility model discloses a multistage rotary plate spray tower absorption device for preparing nitroso sulfuric acid, which belongs to the technical field of waste gas treatment and comprises a multistage spray system, spray towers, a gas conveying pipeline, spray units, rotary plates, a water tank and a drying tower. The gas conveying pipeline between the adjacent spray towers is a Z-shaped baffling pipeline, the center lines of the adjacent spray towers are arranged in a mutually offset manner, the rotating plates are fixedly mounted in the spray towers, each stage of spray tower is independently and fixedly connected with the spray unit, the total end of the spray unit is fixedly connected with the water tank, and the last stage of spray tower is connected with the drying tower through the gas conveying pipeline.

According to a first aspect of the present invention, there is provided an apparatus for forming NOx from nitrogen and oxygen, the apparatus comprising: a gliding arc discharge, GAD, device arranged to generate a plasma; a passageway including an inlet for a feed gas comprising nitrogen and oxygen and an outlet for the NOx, wherein the passageway extends, at least in part, through the GAD device wherein, in use, the nitrogen and oxygen are reacted in the generated plasma, thereby forming the NOx from at least some of the nitrogen and oxygen; and a post-discharge container for adjusting the NO2 / NO ratio in the formed NOx to from 1:2 to 2:1.

The present disclosure provides a static mixer for mixing two or more fluids together. The static mixer comprises a tubular body defining a mixing chamber in which spheroidal bodies are positioned. The spheroidal bodies are arranged sequentially within the mixing chamber, and their size and shape is selected so that they maintain a staggered formation. The tubular body can receive a flow of the two or more fluids at one end and convey them towards an opposite end where a mixed product can be provided. The arrangement of the spheroidal bodies can induce turbulence in the flow of the two or more fluids to mix them as they meander around the spheroidal bodies. The present disclosure further provides a method for mixing two or more fluids by the static mixer.

Method for using a burner-based exhaust gas replication system (100) to generate exhaust gas containing nitrogen dioxide (NO2), comprising: Selecting a fluid that decomposes to form NO2 as one of its decomposition products; Heating the fluid and thereby generating NO2 the extent and duration of the heating are controlled in such a way as to achieve a desired degree of decomposition of NO2; Feeding NO2 into an exhaust stream of the test system (100); and Measuring the fluid before the heating step or measuring the NO2 supplied to the exhaust gas stream to provide a desired amount of NO2 in the exhaust gas stream; wherein a reservoir (21) is provided which contains the fluid that generates NO2, wherein the NO2 generating fluid is injected directly into a combustion zone of the burner (112).

The invention relates to the technical field of nitric acid production, in particular to an NO oxidation catalyst, application thereof and a nitric acid preparation method. According to the present invention, through the cooperation of the specific content of the palladium simple substance in the active component of the catalyst and the transition metal oxide, the high NO conversion rate of the catalyst at the temperature of 200-300 DEG C during the catalytic oxidation process of the high NO concentration process gas is ensured, the NO conversion rate attenuation rate is less than 0.01% / h, the NO oxidation reaction heat can be utilized to produce the by-product steam, and the production cost is reduced. The reaction heat is prevented from being cooled and wasted by circulating water, the water amount of circulating cooling water in a low-temperature section in the nitric acid process is reduced, high-grade heat byproduct steam can be effectively utilized, the heat recycling grade and the utilization rate in the nitric acid production process are improved, and huge economic value is achieved.

According to a first aspect of the present invention, a method for producing NO from nitrogen and oxygen x An apparatus for forming a plasma comprising a gliding arc discharge (GAD) device configured to generate a plasma, an inlet for a feed gas including nitrogen and oxygen, and a NO x a passageway including an outlet for a gas adsorption and desorption stoichiometric plasma (GAD) for reacting, in use, nitrogen and oxygen in the generated plasma to produce NO from at least a portion of the nitrogen and oxygen. x Forming a passage and forming NO x and a post-discharge vessel for adjusting the NO2 / NO ratio therein to 1:2 to 2:1.