356 results about "Oxidized nitrogen" patented technology

A method of self-cleaning a plasma reactor upon depositing a carbon-based film on a substrate a pre-selected number of times, includes: (i) exciting oxygen gas and/or nitrogen oxide gas to generate a plasma; and (ii) exposing to the plasma a carbon-based film accumulated on an upper electrode provided in the reactor and a carbon-based film accumulated on an inner wall of the reactor.

An exhaust gas post treatment system for nitrogen oxide and particle reduction of internal combustion engines operated with excess air. An oxidation catalytic converter is disposed in the exhaust gas stream of the engine for converting at least a portion of the nitric oxide in the exhaust gas into nitrogen dioxide. The first particle separator or filter is disposed in the exhaust gas stream downstream of the oxidation catalytic converter for converting carbon particles accumulated in the separator or filter into carbon monoxide, carbon dioxide, nitrogen and nitric oxide with the aid of nitrogen dioxide contained in the exhaust gas. A partial exhaust gas stream is branched off from the exhaust gas stream upstream of the first separator or filter. A metering device adds reduction agent to the partial exhaust gas stream in the form of ammonia or a material that releases ammonia downstream of the supply location due to hot exhaust gas. A second particle separator or filter is disposed in the partial exhaust gas stream downstream of the supply location. The partial exhaust gas stream returns to the exhaust gas stream downstream of both particle separators or filters. An SCR catalytic converter is disposed downstream of the return location for reducing nitrogen oxides in the exhaust gas to nitrogen and water vapor with the aid of ammonia or released ammonia by way of selective catalytic reduction.

An exhaust gas purifying system includes an exhaust passage, an oxidation catalyst, a selective catalytic reduction catalyst, a urea water supply device, a first heating mechanism and a controller. The exhaust gas discharged from an internal combustion engine flows through the exhaust passage. The oxidation catalyst for oxidizing nitrogen monoxide contained in the exhaust gas to nitrogen dioxide is disposed in the exhaust passage. The selective catalytic reduction catalyst is disposed downstream of the oxidation catalyst. The urea water supply device supplies urea water into the exhaust passage at the upstream of the selective catalytic reduction catalyst. The first heating mechanism heats the oxidation catalyst. The controller controls the first heating mechanism to adjust the temperature of the oxidation catalyst such that molar ratio between nitrogen monoxide and nitrogen dioxide in the exhaust gas flowing into the selective catalytic reduction catalyst become one to one.

The present invention relates to provides one kind of RE perovskite type catalyst for catalytic oxidation of NO into NO2, and features that the catalyst includes the perovskite type active component A1-xA'xB1-yB'yO3, where, A represents RE metal element La, A' includes Zr, Ce, Sr, Ca, Ba and Pr, B and B' represent transition metal element Fe, Co, Ni, Mn, Cu or Ti, x is 0-0.9, and y is 0-1.0. The catalyst of the present invention has simple preparation process, low cost, and NO oxidizing activity up to 80 % at 300 deg.c. It may be used to replace noble metal catalyst for oxidizing NO in lean combustion tail gas into NO2 to raise the NOx eliminating rate.

A method and apparatus for recovering components from a hydrocarbon feedstock is provided. The method includes the steps of (a) supplying a hydrocarbon feedstock to an oxidation reactor, wherein the hydrocarbon feedstock is oxidized in the presence of a catalyst under conditions sufficient to selectively oxidize sulfur compounds and nitrogen compounds present in the hydrocarbon feedstock; (b) separating the hydrocarbons, the oxidized sulfur compounds, and the oxidized nitrogen compounds by solvent extraction; (c) collecting a residue stream that includes the oxidized sulfur compounds and the oxidized nitrogen compounds; and (d) supplying the residue stream to a fluid catalytic cracking unit.

The invention relates to a formula and preparation technology of a granular non-noble-metal efficient integrated air purification composite material, and belongs to the technical field of adsorption catalysis and air pollution treatment. The composite material is characterized by taking zeolite, meerschaum, a porous active carbon material, iolite or a self-made carrier as a catalyst carrier, taking one or several non-noble-metal oxides as an active component and a nitrogen-containing organic auxiliary agent, and being prepared through an immersion method. The catalyst has a column granular shape, and has the capacity of the non-noble-metal oxides being 12-15 wt% and the content of the nitrogen-containing organic auxiliary agent being 2.0-4.0 wt%. The material can effectively adsorb and purify formaldehyde, TVOC, benzene, toluene, xylene, ozone, sulfur dioxide, nitrogen dioxide, hydrogen sulfide and ammonia gas in air in an integrated manner at normal temperature and humidity, and the overall purification rate is no less than 95%. The material is suitable for places, such as offices, office buildings, living rooms, shopping malls, hospitals and hotels, for integrated air purification.

The invention belongs to the measurement technical field of atmosphere environment quality, which specifically relates to an online automatic measuring system for environment air quality based on low-temperature condensing method sampling. The system is composed of a low-temperature condensing sampling system and an analyzing system; the low-temperature condensing sampling system comprises a drying pipe, an electronic cold trap and a low-temperature low trap that are connected in turn; the drying pipe is connected with an air inlet pipeline for removing vapor and condensing the environment air sample at low temperature; the analyzing system comprises a light source, a sampling battery, an optical spectrum instrument and a computer; the analyzing system splits and detects the air condensed by the sampling system through the optical spectrum instrument by the ultraviolet function from the light source and then analyzes the air by the computer. The system is high in integrated degree and measuring efficiency, which is suitable for continuous, real-time and online measurement of various pollutants of atmosphere environment (including sulfur dioxide, nitrogen dioxide, ozone, ammonia, formaldehyde and part of benzene series) in environment air.

The invention discloses an oxidation denitration method for ozone containing HCl industrial exhaust gas, belonging to the field of environmental protection technique. The method of the invention is characterized in that ozone O3 is injected into an oxidation absorption tower where the exhaust gas with the temperature range of 40 to 200 DEG C contains the HCl, so as to oxidize nitrogen compounds such as NO, NO2, etc. in the exhaust gas as high valence nitrogen oxides NO2, N2O3, N2O5, etc. which are easy to be dissolved in water, then a complete denitration disposal process is formed by combining with a wet-method absorption technique. The oxidation denitration method has the advantages of higher denitration efficiency, saving investment, low running expense, no secondary pollution, respectively obtaining by-products to recover the resource, and improving the denitration efficiency by more than 90 percent. The oxidation denitration method can be widely applied to the denitration disposal of the exhaust gas containing various contaminations such as HCI, etc., and is especially suitable for the denitration disposal of the industrial exhaust gases containing contaminations which can lead catalyst in SCR technique to be deactivated.

A nitrogen-oxide gas sensor that is able to measure a nitric oxide and a nitrogen dioxide at the same time, and ensure sensing accuracy and stability over a long period of time.

The nitrogen-oxide gas sensor includes: a first oxygen ion conductive solid electrolyte; a first film contacting the first oxygen ion conductive solid electrolyte and formed of a metal oxide; a second film contacting the first oxygen ion conductive solid electrolyte and formed of a metal oxide; a power supply source for applying a current to the first and second films by electrically connecting a first node to the first film and a second node to the second film; a measurement unit for measuring an electric potential difference between the first and second nodes; and a temperature adjustment unit for uniformly maintaining a temperature of at least one of the first and second films.

The invention discloses a composite catalyst for catalytically oxidizing nitrogen oxide and a preparation method of the composite catalyst. The composite catalyst is prepared by adopting zirconium oxide as a catalyst carrier, and loading active components and assistants on the catalyst carrier, wherein the active components are oxides of transition metals; and the assistants are oxides of rare-earth metals. The composite catalyst is prepared by the equivoluminal impregnation method. The composite catalyst, disclosed by the invention, can reach 84% NO oxidation rate at the catalytic reaction temperature of 300 DEG C. Generated NO2 can be integrally absorbed and removed with the SO2 in the smoke under the downstream smoke wet desulphurization. The oxidization-absorption method of the nitrogen oxide brings no secondary pollution and is economic and effective, and can be applied to removal of nitrogen oxide in the boiler gas and desulfurization and denitrification integrated technology.

The invention provides a preparing method of a carbon-loaded monoatomic metal nitrogen-containing compound oxygen reduction catalyst. The method comprises the steps of pre-oxidizing nitrogen-containing biomass at a first high temperature, after a pre-oxidized product is uniformly mixed with a transition metal source and a pore-forming agent, conducting first calcination at a second high temperature in an inert gas atmosphere, after a calcined product is subjected to acid pickling, washing and drying, conducting second calcination again at the second high temperature, and finally, obtaining thecarbon-loaded monoatomic metal nitrogen-containing compound oxygen reduction catalyst. The preparing method has the advantages of being low in raw material cost, simple in preparing technology and the like; the prepared catalyst has the advantages of being high in pH universality, atom utilization rate, catalytic performance and stability, excellent in methyl alcohol resistance and the like, is expected to replace expensive carbon-loaded platinum catalysts, and is about to have a wide application prospect in efficient and cheap large-scale commercialized fuel cells.

The invention relates to a synthesis method for catalytic oxygen oxidation of glyoxal aqueous solution to glyoxalic acid aqueous solution with nitrogen oxide, which belongs to the field of the chemical synthesis technology. The catalyst used in the method is exhausted nitrogen oxide gas in industrial production, the oxidizer is cheap industrial oxygen, and the product need only be cooled and crystallized for removing oxalic acid.

The invention relates to a device and a process for processing nitrogen-oxide waste gas containing acidic gas, which belong to the technical field of environmental protection. The device uses an alkali-liquid preparing and distributing system for distributing prepared alkali liquid into a dust-removal alkali-liquid circulation absorbing system, a first-stage alkali-liquid circulation absorbing system and a second-stage alkali-liquid circulation absorbing system, the alkali-liquid circulation in the systems use the closed-loop alkali-liquid path showering from top to bottom, the alkali liquid can be sent into a waste alkali-liquid recovery processing system, and the open-loop air path processing waste gas from bottom to top is used for processing waste gas. The process for processing nitrogen-oxide waste gas containing acidic gas is as follows: the processed waste gas respectively enters from the lower parts and exits from the upper parts of a dust-removal alkali-liquid absorbing tower, a first-stage alkali absorbing tower and a second-stage alkali absorbing tower, and the alkali liquid is showered from top to bottom. Ozone in an ozone reactor is used for oxidizing nitrogen oxide in the waste gas into nitrogen dioxide, and the processed waste gas is discharged from the discharge port of the upper part of the second-stage alkali absorbing tower. The device has simple waste gas processing technology, convenient installation, easy operation, mild reaction condition, high efficiency for removing nitrogen oxides and high automatic degree.

There is a harmful organism that cannot be controlled or is difficult to be controlled with the use of a single agent of a compound represented by the general formula (1) according to the invention, an insecticide, a miticide or a fungicide. Accordingly, an object of the invention is to provide a composition for preventing harmful organisms for efficiently controlling such a harmful organism.

That is, the invention is directed to a composition for preventing harmful organisms, characterized by comprising the compound represented by the general formula (1) and other insecticides, miticides or fungicides as active ingredients,

The present invention provides one process of eliminating air pollutant, such as sulfur oxide, nitrogen oxide, mercury vapor and fine dust, from industrial fume. The process is based on one kind of microporous adsorbent-fluoride polymer composite material, which converts the sulfur oxide into acid solution and excludes the acid solution to its outer surface and needs no complicated regeneration. Inside the adsorbent chamber with the modularized composite material, sulfur oxide is converted into high concentration sulfuric acid and thus eliminated from the fume. The composite material adsorbs the mercury vapor inside it via chemical adsorption and eliminates fine dust via surface filtering. The converted sulfuric acid and the fine dust on the surface of the composite material drops into one acid collector.

This invention relates to a method for generating peroxides in petroleum streams and extracting oxidized sulfur and nitrogen compounds. Peroxides are generated in-situ by combining the petroleum stream with a high neutralization number (HNN) crude and adding an oxygen-containing stream. Alternatively, the oxidation of sulfur and nitrogen compounds may be accomplished by adding peroxides in the presence of oil soluble metal catalysts. The peroxides oxidize nitrogen and sulfur compounds in the petroleum stream to more polar compounds which are solvent extracted.

This invention relates to a method for upgrading petroleum streams which have been treated with peroxide, extracted to remove oxidized sulfur and nitrogen compounds, dewaxed and hydrofinished. More particularly, peroxides are generated in-situ by combining the petroleum stream with a high neutralization number (HNN) crude and adding an oxygen-containing stream. Alternatively, the oxidation of sulfur and nitrogen compounds may be accomplished by adding peroxides in the presence of oil soluble metal catalysts. The peroxides oxidize nitrogen and sulfur compounds in the petroleum stream to more polar compounds which are solvent extracted.

A technology for refining crude copper features that at the blowing stage in converter, the contents of S and O in discharged copper are reasonably controlled, the nitrogen instead of air is used for discharge slags, and at reducing stage the nitrogen gas is proportionally added to reducer. Its advantages are simple operation, short period, high productivity, less energy consumption and no smoke pollution.

The invention discloses a catalyst for catalyzing and oxidizing NO under the condition of low temperature plasma and a preparation method thereof which coordinates with plasma technology to realize catalytic oxidation of NO; oxidization activity of the catalyst is outstanding in that 95-99% of NO can be transformed into N2O5 at the temperature of 25-150 DEG C in case of coordination of low temperature of plasma; ammonium nitrate product is obtained by absorption of ammonia water, thus realizing resource utilization of NO; the catalyst is mainly used for depriving NOx in industrial gaseous waste discharged by fixed sources such as a thermal power plant, an oil refinery and a chemical plant, belonging to the technical field of atmospheric pollution purification with the catalyst oxidation technology applied. The method overcomes the defect that the traditional wet method causes reunion; meanwhile, the reaction has the advantages that no solvent is needed, the yield is high and the reaction conditions are easy to be controlled, therefore, the method is easy and feasible in preparing nano-level catalyst. A plurality of experiments indicate that at the temperature of 25-150 DEG C and the airspeed of 10000-60000h<-1>, purification efficiency of NO reaches 95-99%, thus achieving resource treatment of NO.