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5840649 |
NOx adsorbents
The present invention relates to a Mn-added titania carrier obtained by adding a Mn salt to amorphous titania and baking the titania. The invention also relates to an NOx adsorbent comprising the...
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5837212 |
Potassium/manganese nitrogen oxide traps for lean-burn engine operation
The invention is a nitrogen oxide trap comprising a porous support; and catalysts consisting of manganese and potassium loaded on the porous support. The trap may be used in an internal combustion...
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5830346 |
FCC regenerator in partial CO burn with downstream air addition
Oxides of nitrogen (NO x ) emissions from an FCC regenerator are reduced by operating the regenerator in partial CO burn mode to produce flue gas with more CO than O 2 and with NO x precursors....
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5827490 |
Method for converting urea to ammonia
A method for reducing NO x in a combustion exhaust gas stream from a boiler. The method includes the steps of converting an aqueous solution of urea to ammonia by heating the urea solution to a...
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5827489 |
V/Mo/W catalysts for the selective reduction of nitrogen oxides
Impure gas streams containing contaminating amounts of NO x , e.g., automotive exhaust fumes and industrial waste gases, are purified by contacting same, in the presence of ammonia, at an elevated...
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5821190 |
Catalyst comprising iridium, alkaline metal, alkaline earth or rare earth metal, and metal carbide or metal nitride
The present invention provides a catalyst and method for purifying exhaust gases, having superior performance of NOx purification to exhaust gases containing oxygen and nitrogen oxides,...
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5820839 |
Process for the decomposition of hydrogen cyanide, ammonia, or mixtures thereof in the gas phase
Hydrogen cyanide or ammonia present in a gaseous stream is decomposed catalytically in the presence of oxygen at relatively low temperature by contact with carbonaceous adsorbents doped with oxides...
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5804152 |
Method for purifying exhaust gases
An automotive exhaust catalyst includes a support, which is less likely to adsorb SO x contained in exhaust gases thereon, an NO x storage compound loaded on the support, and a noble metal...
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5801117 |
Comprising supported silver sulfate or silver chloride or silver with sulfuric acid
Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i)...
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5801114 |
Catalysts selective for the reduction of nitrogen oxides to nitrogen in an oxidizing medium, a process for their preparation and their use
A catalyst which is active and selective for the reduction of nitrogen oxides to molecular nitrogen by reducing agents in a medium which is superstoichiometric in oxidizing agents such as carbon...
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5800793 |
Process for reducing NO.sub.x from mobile source engine exhaust
A process and system for reducing cold start NO x , carbon monoxide, and hydrocarbon emissions from mobile source engine exhaust utilizes adsorption and desorption of NO x compounds on a...
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5795553 |
Nitrogen oxide adsorbing material
A material effective for adsorbing NO x from an exhaust stream of a combustion process, such as from an internal combustion engine operating under lean burn conditions, is disclosed. The material...
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5792436 |
Method for using a regenerable catalyzed trap
A method of at least periodically removing from a lean gaseous stream a sorbable component such as SO x includes passing the gaseous stream through a trap member having an oxidation catalyst...
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5792437 |
Filter material and method of removing oxides of nitrogen from gases and liquids
A method for removing oxides of nitrogen from gases and liquids by contacting a NO x containing gas or liquid with a polyarylene thioether filter material and a solid oxidizing agent having an...
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5788936 |
Catalyst system for converting emissions of a lean-burn engine
A catalyst system for attaining high conversions of NO, HC, and CO in a fuel-lean emission flow (i.e., containing SO 2 , H 2 O, H 2 , and considerable excess oxygen), the system comprising: (a) a...
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5785936 |
Simultaneous control of SO.sub.2, NO.sub.x, HCl, and particulates by in-furnace high-temperature sorbent injection and particulate removal
A method for the simultaneous control of SO 2 , NO x , HCl, air toxins, metal fumes, and particulate emissions (ash, soot, metal oxides) from fossil fuel burning combustion processes is provided by...
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5785937 |
Method for the catalytic conversion of nitrogen oxides present in the exhaust gas of an internal-combustion engine
A method is provided in which the reducing agent, during the starting phase of the internal-combustion engine and during operation with decreasing and, if appropriate, virtually constant exhaust...
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5772973 |
Exhaust gas cleaner and method for removing nitrogen oxides
Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i)...
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5766562 |
Diesel emission treatment using precious metal on titania aerogel
The invention is a method for treating exhaust gases generated by a diesel engine by providing a sulfur-tolerant lean-NOx catalyst in an exhaust gas passage of the engine and contacting the...
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5758489 |
Sulfur tolerant Pt/lithium NOx traps
The invention is a nitrogen oxide trap comprising a porous support; and catalysts comprising platinum and lithium loaded on the porous support, the lithium being present in a high loading of at...
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5759500 |
Fluid reactor with catalyst on floating tubesheet
A fluid-reactor, heat exchange device and method of reacting a fluid in the device. The device embodies a bundle of heat-exchange tubes mounted internally of an elongated reactor shell to a...
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5756059 |
Advanced reburning methods for high efficiency NO.sub.x control
The present invention is related to methods and systems for preventing the release of nitrogen oxides with combustion flue gases emitted to the atmosphere. The invention is specifically directed to...
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5756057 |
Method for removal of nitrogen oxides from exhaust gas
The removal of nitrogen oxides from an exhaust gas is accomplished by a method which comprises causing the exhaust gas in an oxidizing atmosphere to contact a catalyst comprising a refractory...
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5750082 |
Nox trap with improved performance
The invention is a nitrogen oxide trap separate catalyst phases. One of the phases is platinum on a porous support and another is alkali metal or elements and alkaline earth elements on another...
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5750084 |
Fluidized-bed denitrating method
A fluidized-bed denitrating method and a fluidized-bed denitrating device are disclosed which are capable, of effectively denitrating a combustion exhaust gas by oxidizing nitrogen monoxide...
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5747331 |
Process and apparatus for the purification of gases
The invention relates to a process and an apparatus for the removal of sparingly-soluble gaseous substances, especially sulfur-containing substances from waste gases with the aid of microorganisms....
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5746989 |
Method for purifying exhaust gas of a diesel engine
According to the method of the present invention, NO (nitrogen monoxide) in the exhaust gas of a diesel engine is first oxidized to NO 2 (nitrogen dioxide) by an oxidizing catalyst. Further,...
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5744113 |
Process and catalyst for decomposing oxides of nitrogen
In order to achieve a high degree of conversion, oxides of nitrogen are contacted with a catalyst containing an aluminum silicate having a three-sheet structure as a catalytically active component...
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5736482 |
Catalysts for reducing nitrogen oxides to molecular nitrogen in a superstoichiometric medium of oxidizing compounds, process for preparation, and uses
Described is catalyst that is active and selective for reducing to molecular nitrous oxides contained in a superstoichiometric medium of oxidizing agents, said reduction being conducted with agents...
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5733837 |
Catalyst for catalytic reduction of nitrogen oxides
A catalyst for catalytic reduction of nitrogen oxides using a hydrocarbon and/or a oxygen-containing organic compound as a reducing agent is disclosed, which comprises a cerium oxide supported on a...
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5728357 |
Reduction of NO.sub.x emissions from rotary cement kilns by selective noncatalytic reduction
The use of urea injection SNCR is enabled for rotary kilns of the type used to produce cement clinker. Rotary kilns are long cylinders that rotate about an inclined axis, with cement premix fed in...
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5723099 |
Method and apparatus for remediation of toxic flue gases
Apparatus and method for remediation of particulate matter and gaseous pollutants entrained in flue gases. The flue gases, having a pre-determined moisture content, are mixed with sorbent material...
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5723404 |
Process for the production of mixed oxide powders for catalysts for the removal of nitrogen oxides
A process for the production of a mixed oxide powder, that contains as chief constituent TiO 2 in the form of anatase and as minor constituents at least one of the catalytically active oxides MoO...
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5714432 |
Exhaust gas cleaner comprising supported silver or silver oxide particles
Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i)...
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5710088 |
Lean-NO.sub.x catalysts containing silver supported on alumina
This invention is a catalyst comprising silver loaded on a particularly defined alumina for reducing nitrogen oxide from emissions generated by a lean-burn engine. The alumina has (i) a high...
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5705136 |
Catalyzed decomposition of nitrogen oxides on metal oxide supports
This invention is a nitrogen oxide decomposition process and catalyst employed therein. The catalyst is a metal oxide, such as CoO, on a basic metal oxide-containing support, such as a MgO support.
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5693300 |
Process and apparatus for removing NO.sub.x from gas streams
Process and apparatus for reducing the NO x content of a gas stream containing NO x by reacting the gas stream with activated species. The activated species may be produced by providing a fluid...
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5693299 |
Process for the catalytic conversion of exhaust gases using cerium/zirconium mixed oxide catalyst
Cerium/zirconium mixed oxides (optionally including yttrium values), comprising solid solutions thereof, having contents of zirconium of up to 60 atom % and having thermally stable, very high...
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5683587 |
Process for treating industrial wastes
Water to be utilized is reacted with soda ash and lime to produce a less corrosive and foulant water. Reaction sludges are fed to a desulfurization unit, where SO x , NO x and CO 2 abatement...
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5679314 |
Method for recovering ammonia adsorbent
A method for recovering an ammonia adsorbent which comprises streaming an NO x -containing gas at 300°-600° C. through an ammonia adsorbent layer which adsorbs ammonia and which is saturated...
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5670443 |
Exhaust gas cleaner and method for cleaning exhaust gas
An exhaust gas cleaner constituted by a first catalyst comprising a first porous inorganic oxide supporting an Ag component, a W component and a Pt component and optionally a second catalyst...
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5670124 |
Nitrogen-containing molecular sieving carbon, a process for preparing the same and use thereof
A nitrogen-containing molecular sieving carbon which contains at least 0.1 weight % nitrogen bonded to constituent carbon of the activated carbon. It exhibits improved ability to remove nitrogen...
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5665321 |
Process for the reaction and absorption of gaseous air pollutants, apparatus therefor and method of making same
A method of decreasing the level of NOx, CO and SO 2 emissions in a gas turbine is disclosed. A catalyst absorber, preferably made of alumina/platinum/carbonate salt, is used to oxidize the...
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5658546 |
Denitration catalyst
There is provided a denitration catalyst excellent in denitration activity and durability in a high temperature region, for catalytically reducing NOx in an exhaust gas using a reducing agent such...
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5658545 |
Metal regeneration of iron chelates in nitric oxide scrubbing
The present invention relates to a process of using metal particles to reduce NO to NH 3 . More specifically, the invention concerns an improved process to regenerate iron (II) (CHELATE) by...
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5650127 |
NOx removal process
A method of decreasing the level of NOx and CO emissions in a gas turbine is disclosed. The method includes the steps of oxidizing NO and CO in the gas stream to corresponding NO 2 and CO 2 , and...
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5645804 |
Method for cleaning exhaust gas containing nitrogen oxides
The method of cleaning an exhaust gas containing nitrogen oxides including disposing an exhaust gas cleaner comprising a heat-resistant, porous body, which may support a catalyst consisting...
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5645805 |
Reduction of acid rain and ozone depletion precursors
A method of reducing acid emissions and ozone deletion precursors from a flue gas produced by the combustion of sulphur-or nitrogen-containing fuel or acid emissions and ozone deletion precursors...
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5635076 |
Treatment process for acrylonitrile plant wastewater streams
A process for the destruction of organic wastes and ammonia from acrylonitrile plant wastewater, comprising contacting volatilized wastewater with a catalyst at an elevated temperature so as to...
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5635150 |
Sorption of acidic gases by solid residue from sugar refining
Solid residues formed as byproducts during the refining of sugars (e.g., beet sugar or cane sugar) are employed to sorb acidic gases such as oxides of sulfur or nitrogen. Calcines of the solid...
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