71 results about "Nitrogen tetroxide" patented technology

A catalyst and a process for selective catalytic reduction of nitrogen oxides in diesel engine exhaust gases with ammonia or a compound decomposable to ammonia are described. The exhaust gas to be cleaned is passed together with ammonia or a compound decomposable to ammonia over a catalyst which comprises a zeolite or a zeolite-like compound containing 1-10% by weight of copper, based on the total weight of the zeolite or of the zeolite-like compound, and a homogeneous cerium-zirconium mixed oxide and / or a cerium oxide. The zeolite used or the zeolite-like compound used is selected from the group consisting of chabazite, SAPO-34, ALPO-34 and zeolite-β.

It is intend to provide at low cost an exhaust gas purifier capable of in an internal combustion engine or other combustion instrument mainly driven under excess air conditions, efficiently removing nitrogen oxides from exhaust gas. A nitrogen oxide adsorbent (4) is disposed in an exhaust passage, which the nitrogen oxide adsorbent (4) is composed of a lithium composite oxide of the general formula LiAxOy or LiAxPO4, containing as constituent elements lithium (Li) and at least one element (A) selected from the group consisting of manganese (Mn), nickel (Ni), cobalt (Co), vanadium (V), chromium (Cr), iron (Fe), titanium (Ti), scandium (Sc), and yttrium (Y). For example, the nitrogen oxide adsorbent (4) is composed of a lithium composite oxide, such as lithium manganate (LiMnO3), the lithium titanate (Li2TiO3) or lithium manganate phosphate (LiMnPO4).

Provided is a catalyst including: a support including titanium oxide; an active catalyst component including vanadium oxide; and a co-catalyst including antimony and cerium, in which the catalyst is included in a deNox reduction reaction that decomposes nitrogen oxide. The catalyst may improve sulfur poisoning tolerance characteristics while improving the deNox efficiency at a temperature in a wide range from low temperature to high temperature.

An exhaust gas purification catalyst apparatus, which is superior in oxidation performance of, in particular, nitrogen monoxide, among hydrocarbons, carbon monoxide, nitrogen oxides and particulate components such as soot, included in exhaust gas from a lean burn engine, and combustion performance of light oil. The exhaust gas purification apparatus arranged with an oxidation catalyst (DOC) comprising a noble metal component for oxidizing carbon monoxide, hydrocarbons, in particular, nitrogen monoxide among nitrogen oxides, and for combusting light oil, a catalyzed soot filter (CSF) including a noble metal component for collecting a particulate component such as soot and removing by combustion (oxidation). The oxidation catalyst (DOC) has a catalyst layer where platinum (Pt), palladium (Pd) and barium oxide (BaO) are supported on alumina (Al2O3) having a pore size of 12 to 120 nm, and ratio of platinum and palladium is 1:1 to 11:2 in weight equivalent.

The present invention relates to a mixed metal oxide catalyst in which a hydrotalcite precursor containing an alkali metal is impregnated or intercalated with a nonprecious metal, a method of manufacturing the same, and a method of decomposing nitrogen oxide using the mixed metal oxide catalyst. The mixed metal oxide catalyst has excellent catalytic activity because it can decompose NOx, N2O or a mixture thereof even at low temperature, and is economical because it does not use a precious metal.

The present invention discloses the application of N2O4 as catalyst in producing dimethyl sulfoxide. Liquid N2O4 is pressurized into a gasifier at the pressure of 0.2-0.25 MPa and gasified at 45-65 deg.c to produce NO2 gas, and the produced NO2 gas is made to enter buffering tank at 0.15-0.2 MPa and further flow from the buffering tank to oxidizing reactor at controlled flow rate for serving as catalyst in producing dimethyl sulfoxide. The present invention has the advantages of no waste produced, stable reaction and no explosion accident.

Etch assisting agents for focused ion beam (FIB) etching of copper for circuit editing of integrated circuits both prevent loss of adjacent dielectric due to sputtering by the ion beam, and render sputtered re-deposited copper on adjacent surfaces non-conductive to avoid electrical short circuits. The agents are characterized by having an N—N (N being Nitrogen) bonding in their molecules and boiling points between about 70° C. and about 220° C., and include hydrazine and water solutions, hydrazine derivatives, NitrosAmine derivatives saturated with two hydrocarbon groups selected from Methyl, Ethyl, Propyl and Butyl, NitrosAmine related compounds, and Nitrogen Tetroxide. Preferred agents are Hydrazine monohydrate (HMH), HydroxyEthylHydrazine (HEH), CEH, BocMH, BocMEH, NDMA, NDEA, NMEA, NMPA, NEPA, NDPA, NMBA, NEBA, NPYR, NPIP, NMOR and Carmustine, alone or in combination with Nitrogen Tetroxide. The agents are effective for etching copper in high aspect ratio (deep) holes.

An engine system for treating nitrogen oxides present in an exhaust gas generated by the combustion of fuel. The engine system includes one or more long breathing lean nitrogen oxide traps that is / are configured to store at least a portion of the nitrogen oxide in the exhaust gas when the lean nitrogen oxide trap operates in an absorption mode. The lean nitrogen oxide trap is also configured for the conversion of the nitrates stored by the lean nitrogen oxide trap during a regeneration event. The engine-out nitrogen oxide levels may be reduced to extend the duration of the absorption process, thereby reducing both the frequency of regeneration events and the associated fuel penalty. The system may include primary and secondary exhaust gas recirculation systems, with exhaust gas from the secondary system being returned to the engine cylinder to reduce the level of nitrogen oxides in that exhaust gas.

The invention discloses a boiler optimization method for reducing nitrogen oxide discharge. A boiler is a 600MW machine set boiler, and a hearth of the boiler is sequentially divided into an AA layer, an A layer, an AB layer, a B layer, a BC layer, a C layer, a CD layer, a D layer, a DE layer, an E layer, an EF layer, an E layer, an FF layer and an OFA layer from bottom to top. The method comprises the following steps that the opening degree of a secondary air baffle plate of the AA layer of the boiler is set to -40 percent bias switching automation, the opening degree of a secondary air baffle plate of the AB layer of the boiler is set to -10 percent bias switching automation, the opening degree of a secondary air baffle plate of the BC layer of the boiler is set to -23-30 percent bias switching automation, the opening degree of secondary air baffle plates of the CD layer and the DE layer of the boiler is set to unbiassed switching automation, the opening degree of secondary air baffle plates of the EF layer, the FF layer and the OFA layer of the boiler is set to +15 percent bias switching automation, the opening degree of a secondary air baffle plate of the boiler is set to +15 percent bias switching automation, and the opening degree of a circumferential air baffle plate of the boiler is set to 70 percent when the rotation speed of a coal feeding machine of the boiler is higher than 80 percent of the rated rotating speed. The method realizes the low NOx (nitrogen oxide) discharge.

Provided is an exhaust gas cleaner by which nitrogen oxides contained in an exhaust gas can be efficiently removed in a wide temperature range from a low temperature. The exhaust gas cleaner (10) is for use in purifying the exhaust gas discharged from an internal combustion engine (15) in which fuel is fed under periodical rich or lean conditions and burned. The cleaner (10) comprises: a reforming means (11) which generates a reforming gas comprising hydrogen and carbon monoxide; a means of low-temperature oxidation (12) which contains palladium and which thereby can oxidize and adsorb nitrogen oxides at low temperatures and oxidize the hydrogen and carbon monoxide; and a purifying means (13) which under lean conditions adsorbs nitrogen oxides and which under rich conditions releases the adsorbed nitrogen oxides and removes the released nitrogen oxides with the hydrogen and carbon monoxide present in the channel. By contriving the layout of the reforming means (11), means of low-temperature oxidation (12), and purifying means (13), nitrogen oxides contained in an exhaust gas can be removed in a wide temperature range from a low temperature.

The present disclosure generally pertains to a rocket propulsion oxidizer compound that is a solution, is a homogenous and stable liquid at room temperature and includes nitrous oxide and nitrogen tetroxide. In addition, an apparatus is provided for burning a fuel and nitrous oxide / nitrogen tetroxide. The apparatus has a combustor, a catalyst, a nitrous oxide / nitrogen tetroxide supply passage for directing the nitrous oxide / nitrogen tetroxide to a contact position with the catalyst, and a fuel supply passage for supplying the fuel to the combustor. The catalyst acts to facilitate decomposition of the nitrous oxide / nitrogen tetroxide, while the combustor burns the fuel, the decomposed nitrous oxide / nitrogen tetroxide and / or nitrous oxide / nitrogen tetroxide decomposed in the reaction.

A metal-nitric oxide electrochemical cell which is fed a gas comprising nitric oxide (NO) and at least one gas selected from the group consisting of a nitrogen oxide of formula NxOy, oxygen, water vapor, a gaseous hydrocarbon, carbon monoxide and carbon dioxide is provided. Also provided is a rechargeable battery containing the metal-nitrogen oxides electrochemical cell. A vehicle system wherein exhaust gas from a combustion engine serves as a feed of active cathode material to a metal-nitrogen oxides battery is additionally provided.

Embodiments enclosed herein relate to methods and apparatus for reducing nitrogen oxides (NOx) produced during processing, such as during semiconductor fabrication processing. A processing system may include an abatement controller and an effluent abatement system, wherein the abatement controller controls the effluent abatement system to reduce NOx production, while ensuring abatement of the effluent gases from the processing system. The effluent abatement system may include a combustion-type effluent abatement system and / or a plasma-type effluent abatement system. The abatement controller may select operating modes of the effluent abatement systems to reduce NOx production.