314 results about "Nitrogen monooxide" patented technology

A combustion analyzer apparatus and method for combustion analysing a sample, the analyzer comprising a combustion chamber (82) for receiving a sample for combustion therein to form combustion products, and a fluid supply apparatus for supplying fluid(s) into the chamber. The fluid supply apparatus (130-140) comprises a nitrogen oxides (NO_x) generating apparatus (140,190,210,240) and is arranged to supply NO_x into the combustion chamber. A yield of sulphur dioxide in the combustion products may thereby be improved. The NO_x generating apparatus may be operated at a raised working temperature. The NO_x generating apparatus may be provided by an ozonator with a supply of nitrogen and oxygen. A Venturi tube arrangement (246) may draw the generated NO_x into a (carrier or oxygen) gas line to the combustion chamber. Ozone may be supplied to the combustion products to convert nitrogen monoxide therein to nitrogen dioxide. The NO_x and ozone may be supplied by a single device (210,240).

An oxidation catalyst that efficiently promotes oxidation of NO to NO₂ even in a low temperature range, and an exhaust-gas purification system and method that efficiently removes exhaust-gas components even in a low temperature range are provided. This invention provides an oxidation catalyst comprising platinum and palladium as catalytically active components, which promotes oxidation of nitrogen monoxide to nitrogen dioxide, wherein the oxidation catalyst comprises 1 to 55% by weight of the palladium relative to 100% by weight of the platinum.

The present invention relates to a technology to purify nitrogen oxides contained in exhaust gas exhausted from lean combustion engines such as diesel engine with ammonia and a selective catalytic reduction type catalyst, and an object of the present invention is to provide a selective catalytic reduction type catalyst which can effectively purify nitrogen oxides even at a low temperature as well as inhibit leak of ammonia, and an exhaust gas purification equipment and a purifying process of exhaust gas using the same.

The present invention is a selective catalytic reduction type catalyst for purifying nitrogen oxides in exhaust gas exhausted from lean combustion engines using ammonia or urea as a reducing agent, it is provided with a selective catalytic reduction type catalyst, characterized in that said catalyst comprises a lower-layer catalyst layer (A) having an oxidative function for nitrogen monoxide (NO) in exhaust gas and an upper-layer catalyst layer (B) having an adsorbing function for ammonia on the surface of a monolithic structure type carrier (C), and that the lower-layer catalyst layer (A) comprises a noble metal component (i), an inorganic base material constituent (ii) and zeolite (iii), and the upper-layer catalyst layer (B) comprises substantially none of component (i) but the component (iii).

The invention discloses a preparation method of a chelate coating with copper ions capable of controllably catalyzing release nitrogen monoxide and a polyphenol complex. The preparation method comprises the following steps: soaking a target modified material or an instrument in a mixed aqueous solution consisting of soluble metal salt, soluble copper salt and a compound having an o-phenol structure; and depositing a layer of chelate coating with copper ions with a function of catalyzing nitrogen monoxide and the polyphenol complex on the surface. The chelate coating with the copper ions and the polyphenol complex, which is obtained by the preparation method disclosed by the invention, not only has excellent biocompatibility and bacterial resistance, but also has a function of inducing catalysis of endogenous nitrogen monoxide to release in a blood environment. In addition, the coating is nearly applicable to surface modification of materials of all textures, complex geometrical shapes and different topological structures.

A method and an apparatus for plasma-chemical production of nitrogen monoxide is used to produce inhalation gas enriched with nitrogen monoxide for medical purposes. The nitrogen-monoxide production is achieved through the use of a dielectric barrier discharge created in a process gas containing nitrogen and oxygen.

An oxidation promoting catalyst (42) which converts nitrogen monoxide in exhaust gas to nitrogen dioxide, and a diesel particulate filter (41) which traps soot in the exhaust gas, are installed in an exhaust gas passage of a diesel engine (1). A control unit (21) determines whether or not it is necessary to regenerate the filter based on the exhaust gas pressure detected by an exhaust gas pressure sensor (24), and when it is necessary to regenerate the filter, it increases the nitrogen monoxide in the exhaust gas by performing an advance correction of the fuel injection timing of a fuel injector (14) so as to promote generation of nitrogen dioxide by the oxidation promoting catalyst. The nitrogen dioxide decreases the combustion temperature of the soot trapped by the diesel particulate filter (41), and efficiently regenerates the filter.

The present invention is characterized in that a casing 2 connected to an exhaust system 8, a honeycomb filter 3 placed in the inside of the casing 2, the honeycomb filter having a plurality of cells partitioned by partition walls, and plasma generation electrodes 6 placed being faced each other by sandwiching the honeycomb filter there are included, particulate matter contained in an exhaust gas is collected by the honeycomb filter 3, nitrogen monoxide contained in the exhaust gas is oxidized to nitrogen dioxide by nonthermal plasma generated between a pulse electrode 4 and an earth electrode 5 constituting the plasma generation electrodes 6, combustible materials in the particulate matter collected and deposited on the surface of the partition walls are removed through oxidation by the nitrogen dioxide produced. As a result, the honeycomb filter 3 can be regenerated.

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 invention discloses a nitrogen-oxygen sensor, which comprises a zirconium oxide substrate, two sensitive electrodes and a reference electrode, wherein the zirconium oxide substrate is made of yttrium-oxide-stabilized zirconium oxide, both the two sensitive electrodes are positioned on the zirconium oxide substrate and used for contacting with detected gas, one sensitive electrode is sensitive to NO (nitrogen monoxide) gas, the other sensitive electrode is sensitive to NO2 (nitrogen dioxide) gas, the reference electrode is positioned on the other side of the zirconium oxide substrate and used for contacting with air, and the two sensitive electrodes are respectively electrically connected with the reference electrode. The operating range of the nitrogen-oxygen sensor ranges from 350 DEG C to 800 DEG C, the concentration range of detected nitrogen oxides ranges from 5ppm to 3000ppm, and the response time can reach 1.2 seconds. The nitrogen-oxygen sensor is simple in structure and high in response speed and has the advantages of stable performance, simple manufacture process and wide measurement range.

A method of cleaning a film-forming apparatus to remove at least a part of a silicon-based material deposited on a constituent member of the film-forming apparatus after used to form thin films includes introducing a first-gas including fluorine gas and a second gas including nitrogen monoxide gas into the film-forming apparatus, and heating the constituent member. The constituent member includes quartz or silicon carbide, and the silicon-based material includes silicon nitride.

An exhaust purification device, including a NO_x storing catalyst comprised of a precious metal catalyst and NO_x absorbent, arranged in an engine exhaust passage, which increases the ratio of the nitrogen dioxide to the nitrogen monoxide produced when burning fuel under a lean air-fuel ratio when the NO_x storing catalyst is not active compared with the time when the NO_x storing catalyst is active under the same engine operating conditions and stores the nitrogen dioxide contained in the exhaust gas in the NO_x absorbent at that time.

This invention provides a DDR type zeolite membrane, characterized in that it is formed as a membrane on a substrate and its main component is silica, and that each single gas permeance at room temperature and 100° C. are different, respectively among at least two types of gases selected from a group consisting of carbon dioxide (CO₂), hydrogen (H₂), oxygen (O₂), nitrogen (N₂), methane (CH₄), normal butane (n-C₄H₁₀), isobutane (i-C₄H₁₀), sulfur hexafluoride (SF₆), ethane (C₂H₆), ethylene (C₂H₄), propane (C₃H₈), propylene (C₃H₆), carbon monoxide (CO), and nitrogen monoxide (NO).

The invention relates to an ultrahigh-sensitivity fluorescent probe for detecting nitrogen monoxide. The ultrahigh-sensitivity fluorescent probe has the structural general formula in the original text. During preparation, firstly, 4-bromine-1, 8-anhydride naphthalene and o-nitro p-phenylenediamine with equal molar weights are used as raw materials, dissolved in ethylene glycol monomethyl ether and heated for reaction to obtain light yellow solid. Secondly, the light yellow solid is dissolved in anhydrous DMSO, primary amine is added into the anhydrous DMSO, the anhydrous DMSO is heated and refluxed, and reaction liquid is filtered in a sucking manner, depressurized and dried to obtain yellow solid. The yellow solid is dissolved in mixed liquid of tetrahydrofuran and methanol, and a yellow probe is obtained under catalysis of hydrogen and catalysts. Probe molecules have fine chemical and optical stability, good solubility and biological compatibility and high nitric oxide selectivity, and are free of interference of other active oxygen, active nitrogen and the like. Laser confocal imaging experiments indicate that the probe has fine cellular permeability, has no toxic and side effects on cells and organisms, and can be used for detecting protogenetic nitrogen monoxide in a high-sensitivity manner.

An exhaust stream aftertreatment system that selectively reduces NOx emissions during lean-burn operation of an internal combustion engine is provided. The apparatus includes a partial oxidation reactor having a fuel source, an ignition device, and various values. The partial oxidation reactor is disposed in the exhaust pipe of automobile between the engine and the threeway catalyst. A light-off catalyst is provided adjacent to the engine, upstream from the partial oxidation reactor. The three-way catalyst and the light-off catalyst are typical automotive catalysts having a substrate plated with a precious metal to facilitate the oxidation of hydrocarbons (HC) and carbon monoxide (CO) as well as the reduction of nitrogen monoxide and nitrogen dioxide (NOx). The partial oxidation reactor is adapted to operate while the internal combustion engine is producing high levels of NOx or while the engine is operating in a lean burn regime.

A method in which the exhaust gas that is to be purified is passed through an exhaust-gas line containing a diesel oxidation catalyst (DOC) for the oxidation of residual gaseous hydrocarbons (HC) and carbon monoxide (CO) in order to form carbon dioxide (CO₂) and for the at least proportional oxidation of the nitrogen monoxide (NO) contained in the exhaust gas in order to form nitrogen dioxide (NO₂) is provided.

The invention relates to the field of electrochemical sensors, and in particular relates to an HCN (hydrogen cyanide) four-electrode electrochemical sensor resistant to nitrogen monoxide and nitrogen dioxide interference. The HCN electrochemical sensor provided by the invention comprises a first working electrode, a second working electrode, a reference electrode and a counter electrode which form ion conduction via electrolyte, wherein the first working electrode is a carbon element electrode, and the second working electrode an Au-containing electrode. The HCN electrochemical sensor provided by the invention is capable of effectively eliminating the cross interference between NO and NO2 and accurately measuring the concentration of an HCN gas via the design of a four-electrode sensor system comprising the reference electrode, the counter electrode and the two working electrodes.

To provide a catalyst for treating exhaust gases containing nitrogen monoxide, carbon monoxide and volatile organic compounds whose oxidation power has been enhanced without increasing the amount of precious metal supported thereon; a method for producing the same; and a method for treating exhaust gases. A catalyst for treating exhaust gases, including coat layers made up of a plurality of layers, an upper layer of which has an active component contained uniformly therein and a lower layer of which has no active component contained therein, can be obtained through the steps of: forming the lower layer by coating the surface of substrate with a slurry of a porous inorganic compound, followed by drying; and forming the upper layer, which is to be the top surface of the catalyst, by coating the surface of the lower layer with a slurry of a porous inorganic compound that has the active component composed of one or more precious metals supported thereon, followed by drying.

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.