Class / Patent application number | Description | Number of patent applications / Date published |
423239200 | Zeolite | 53 |
20080213150 | Method for Controlling Nox Emissions in the Fccu - Processes for the reduction of NO | 09-04-2008 |
20080241034 | Method For Reducing the Nitrogen Oxide Concentration in Gases - The method comprises passing an N | 10-02-2008 |
20080279741 | Reactor system for reducing NOx emissions from boilers - A zeolite based SCR catalyst for NOx reduction using a reducing agent for treating exhaust streams from industrial and commercial boilers is provided. The reactor system has a zeolite based catalyst arranged in catalyst cassettes in a modular fashion where the reactor containing the zeolite based SCR catalyst cassettes is placed in a perpendicular direction to the exhaust exiting the industrial and/or commercial boiler. The catalyst selectively reduces nitrogen oxides to nitrogen with a reducing agent at low to medium temperatures. The reactor results in high NOx conversions and very low ammonia slip and is active for a wide range of boiler firing conditions. Boilers with low NOx and/or ultra low NOx burners can be replaced with a standard conventional burner for overall emissions reduction performance, efficiency improvements and energy savings. Boilers with low NOx and ultra low NOx burners can also be fitted with this zeolite based SCR catalyst reactor for additional NOx reductions and energy savings. | 11-13-2008 |
20090004083 | NOx control for IC engines - A multi-stage NOx reduction system employs catalysts effective at different temperature ranges and can have reagent injectors associated with each, for use in series or in parallel. A controller directs reagent introduction to one catalyst or the other as temperature and other conditions dictate. Valving can redirect exhaust to particular catalyst zones, if necessary. | 01-01-2009 |
20090004084 | Exchange Cation Selection in ETS-4 to Control Adsorption Strength and Effective Pore Diameter - The effective pore diameter of ETS-4 can be controlled without thermal treatment by selecting various combinations of cations to exchange into ETS-4. The effect that any cation mixture has on the ETS-4 can be reduced to the weighted average of the effects of each cation present. | 01-01-2009 |
20090068079 | Compositions and processes for reducing NOx emissions during fluid catalytic cracking - Compositions for reduction of NO | 03-12-2009 |
20090081098 | Ammonia SCR catalyst and method of using the catalyst - A catalyst and a method for selectively reducing nitrogen oxides with ammonia are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixture of lanthanides, or mixtures thereof, and a zeolite. The catalyst may also include strontium as an additional second component. The catalyst selectively reduces nitrogen oxides to nitrogen with ammonia at low temperatures. The catalyst has high hydrothermal stability. The catalyst has high activity for conversion of nitrogen oxides in exhaust streams, and are not significantly influenced by the NO/NO | 03-26-2009 |
20090196813 | HIGH TEMPERATURE CATALYST AND PROCESS FOR SELECTIVE CATALYTIC REDUCTION OF NOX IN EXHAUST GASES OF FOSSIL FUEL COMBUSTION - A process for producing a stable high-temperature catalyst for reduction of nitrogen oxides in combustion exhaust gases at operating temperatures from 300° C. to over 700° C. without the need for exhaust dilution. A zeolite material is steam-treated at a temperature and duration sufficient to partially de-aluminize the zeolite to approximately a steady state, but not sufficient to fully collapse its chemical structure. Iron is added to the zeolite material. The zeolite material is calcined at a temperature, humidity, and duration sufficient to stabilize the zeolite material. Examples and specifications for ranges, order, and durations of steaming, calcining, and other steps are provided. | 08-06-2009 |
20090263304 | CATALYST FOR REMOVAL OF NITROGEN OXIDE AND METHOD FOR REMOVAL OF NITROGEN OXIDE - A porous material having fine holes with controlled diameters and a catalyst having an active ingredient supported in the fine holes in the porous material are used. According to a first embodiment of the invention, the diameter of the plurality of fine holes is within a range of 8 to 9 Å. The fine hole diameter is preferably from 8 to 9 Å when the diameter is measured in a gas adsorption method in which fine holes with diameters of 3.4 to 14 Å can be measured. The fine hole diameter is also preferably from 8 to 9 Å when the fine hole diameter is calculated from a crystal structure. According to a second embodiment of the invention, the porous material is mesoporous silica. The primary particle diameter of the mesoporous silica is preferably within a range of 150 to 300 nm. | 10-22-2009 |
20090269265 | Exhaust gas purification method using selective reduction catalyst - An exhaust gas purification method which is capable of purifying nitrogen oxide to be included in exhaust gas from a lean burn engine such as a boiler, a gas turbine or a lean-burn-type gasoline engine, a diesel engine, effectively, in particular, even at low temperature, with spray-supplying an aqueous solution of urea as the reducing component to the selective reduction catalyst. | 10-29-2009 |
20090297419 | AMMONIA SCR CATALYST AND METHOD OF USING THE CATALYST - A catalyst and a method for selectively reducing nitrogen oxides with ammonia are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixture of lanthanides, or mixtures thereof, and a zeolite. The catalyst may also include strontium as an additional second component. The catalyst selectively reduces nitrogen oxides to nitrogen with ammonia at low temperatures. The catalyst has high hydrothermal stability. The catalyst has high activity for conversion of nitrogen oxides in exhaust streams, and are not significantly influenced by the NO/NO | 12-03-2009 |
20090304566 | AMMONIA SCR CATALYST AND METHOD OF USING THE CATALYST - A DPF with an SCR catalyst and a method for selectively reducing nitrogen oxides with ammonia, filtering particulates, and reducing the ignition temperature of soot on a DPF are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixture of lanthanides, or mixtures thereof, and a component characterized by increased surface acidity. The catalyst may also include strontium as an additional second component. The catalyst selectively reduces nitrogen oxides to nitrogen with ammonia and oxidizes soot at low temperatures. The catalyst has high hydrothermal stability. | 12-10-2009 |
20100003178 | -ZEOLITE FOR SCR CATALYST AND METHOD FOR PURIFYING NITROGEN OXIDES USING SAME - An SCR catalyst using a β-zeolite in which the molar ratio of SiO | 01-07-2010 |
20100028231 | SYNTHESIS AND USE OF NANOCRYSTALLINE ZEOLITES - Embodiments of the present invention relate to a method for synthesizing nanocrystalline zeolites, the method comprising contacting starting products that comprise a solvent, a silicon source, a cation base, an organic template, and an aluminum source, or any combination thereof sufficient to produce a zeolite gel by hydrolysis, heating the zeolite gel sufficient to produce a first batch of zeolite crystals and a first clear solution, separating the first batch of zeolite crystals from the first clear solution, heating the first clear solution sufficient to produce a second batch of zeolite crystals and second clear solution and separating the second batch of zeolite crystals from the second clear solution. In addition, embodiments relate to a method of using nanocrystalline zeolites, the method comprising contacting a nanocrystalline zeolite with a reductant sufficient to produce a nanocrystalline zeolite with adsorbed reductant and exposing the nanocrystalline zeolite with adsorbed reductant to reactant gases sufficient to obtain reaction products and the nanocrystalline zeolite. | 02-04-2010 |
20100092361 | NOVEL MICROPOROUS CRYSTALLINE MATERIAL COMPRISING A MOLECULAR SIEVE OR ZEOLITE HAVING AN 8-RING PORE OPENING STRUCTURE AND METHODS OF MAKING AND USING SAME - There is disclosed a hydrothermally stable microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure, such as SAPO-34 or aluminosilicate zeolite, able to retain a specific percentage of its surface area and micropore volume after treatment with heat and moisture, such as at least 80% of its surface area and micropore volume after exposure to temperatures of up to 900° C. in the presence of up to 10 volume percent water vapor for a time ranging from 1 to 16 hours. Methods of using the disclosed crystalline material, such as in the SCR of NO | 04-15-2010 |
20100092362 | HIGH SILICA CHABAZITE FOR SELECTIVE CATALYTIC REDUCTION, METHODS OF MAKING AND USING SAME - There is disclosed a microporous crystalline material comprising a metal containing chabazite having a crystal size greater than 0.5 microns and a silica-to-alumina ratio (SAR) greater than 15, wherein the metal containing chabazite retains at least 80% of its initial surface area and micropore volume after exposure to temperatures of up to 900° C. in the presence of up to 10 volume percent water vapor for up to 1 hour. Methods of using the disclosed crystalline material, such as in the SCR of NO | 04-15-2010 |
20100111796 | Integrated SCR and AMOX Catalyst Systems - Catalysts, methods of preparing catalyst, and methods for treating exhaust gas streams are described. In one or more embodiments, a catalyst system includes an upstream zone effective to catalyze the conversion of a mixture of NO | 05-06-2010 |
20100143227 | MIXED CATALYST FOR NOx REDUCTION AND METHODS OF MANUFACTURE THEREOF - Disclosed herein is a catalyst comprising a binder; and a catalytic composition, the catalytic composition comprising a first catalyst composition that comprises a zeolite; and a second catalyst composition that comprises a catalytic metal disposed upon a porous inorganic material, wherein the porous inorganic material is a metal oxide, an inorganic oxide, an inorganic carbide, an inorganic nitride, an inorganic hydroxide, an inorganic oxide having a hydroxide coating, an inorganic carbonitride, an inorganic oxynitride, an inorganic boride, an inorganic borocarbide, or a combination comprising at least one of the foregoing inorganic materials; wherein the catalyst is in the form of an extrudate or foam. | 06-10-2010 |
20100143228 | ZEOLITE CATALYST FOR REMOVING NITROGEN OXIDES, METHOD FOR PREPARING THE SAME, AND METHOD OF REMOVING NITROGEN OXIDES USING THE SAME - A zeolite catalyst for removing nitrogen oxides is provided, in which 5 to 30 wt % of manganese (Mn) and 2 to 20 wt % of iron (Fe) on the basis of the total weight of the catalyst are supported on zeolite, and a method for preparing the same, and a method for removing nitrogen oxides using the same are provided. | 06-10-2010 |
20100166632 | Method for the Decomposition of N2O, Catalyst Therefor and Preparation of this Catalyst - The invention relates to a method for the catalytic decomposition of N | 07-01-2010 |
20100172814 | Zeolite Catalyst With Improved NOx Reduction in SCR - The present invention is directed to a novel metal-promoted zeolite catalyst, a method of producing the catalyst and a method of sing the catalyst for the selective catalytic reduction of NO | 07-08-2010 |
20100209327 | STRUCTURED SCR CATALYST FOR THE REDUCTION OF NITROGEN OXIDES IN THE EXHAUST GAS FROM LEAN-BURN ENGINES USING AMMONIA AS REDUCING AGENT - The reductive removal of nitrogen oxides from the exhaust gas from internal combustion engines operated predominantly under lean conditions takes place in a selective catalytic reduction (SCR) of the nitrogen oxides by means of ammonia or a compound which can be decomposed into ammonia as reducing agent. Conventional SCR catalysts typically have a relatively narrow working temperature window, usually 350° C. to 520° C., in which good nitrogen oxide conversions can be achieved with sufficient selectivity. SCR catalyst formulations whose working window is in the temperature range from 150° C. to 350° C. generally not be used at higher temperatures since they oxidize the ammonia required as reducing 18 agent to nitrogen oxides at above 350° C. To cover the entire exhaust gas temperature range typical of vehicles having been operating internal combustion engines extending from 200° C. to 600° C., it has therefore mostly been necessary to use complicated exhaust gas systems containing a plurality of catalysts having different working temperature ranges. Disclosed is a structured SCR catalyst whose working range extends over a significantly broader temperature window and by means of which complicated exhaust gas units can be considerably simplified, with a saving of components. | 08-19-2010 |
20100221164 | NOX EMISSION CONTROL SYSTEM FOR HYDROCARBON FUELED POWER SOURCE - A method of reducing NO | 09-02-2010 |
20100221165 | OFF-GAS CATALYST FOR HYDROCHLORIC ACID-CONTAINING OFF-GASES - The present invention relates to a process for reactivating a catalyst which comprises a zeolite doped with an iron species, which comprises the step of treating the catalyst with hydrogen chloride-containing gas. The invention further relates to a reactivated catalyst which is obtained with the aid of the process according to the invention and to the use thereof for treatment of off-gases from incineration processes, especially for the treatment of off-gases from refuse incineration plants, very particularly for the reduction of nitrogen oxides. | 09-02-2010 |
20100266471 | EXHAUST AFTERTREATMENT SYSTEM AND METHOD OF TREATING EXHAUST GAS - A diesel exhaust aftertreatment system and method are provided. The system includes a lean NO | 10-21-2010 |
20100296992 | Honeycomb Catalyst And Catalytic Reduction Method - Honeycomb catalyst structures and methods of using them, where the structures have honeycomb channel walls of selective catalytic reduction catalyst, the channel walls occupy at least 20% of the volume of the structure, the structure exhibits a pressure drop for flowing air not exceeding about 110 Pa at a space velocity of 20,000 hr | 11-25-2010 |
20100303699 | METHOD OF REMOVING N20 FROM WASTE GAS - The invention provides a N | 12-02-2010 |
20110020204 | Chabazite Zeolite Catalysts Having Low Silica to Alumina Ratios - Disclosed are zeolite catalysts having the CHA crystal structure with a low silica to alumina ratio, as well as articles and systems incorporating the catalysts and methods for their preparation and use. The catalysts can be used to reduce NOx from exhaust gas streams, particularly those emanating from gasoline or diesel engines. | 01-27-2011 |
20110044873 | Fabrication Method of Zeolite Honeycomb Type Catalyst for Reducing Nitrogen Oxide - The present invention relates to conversion of exhaust gas containing nitrogen oxide (NO | 02-24-2011 |
20110158877 | METHOD FOR THE DECOMPOSITION OF N2O, CATALYST FOR IT, AND THE PREPARATION OF THIS CATALYST - A method for the catalytic decomposition of N | 06-30-2011 |
20110165051 | Process Of Direct Copper Exchange Into Na+-Form Of Chabazite Molecular Sieve, And Catalysts, Systems And Methods - Disclosed are processes for the preparation of copper containing molecular sieves with the CHA structure wherein the copper is exchanged into the Na | 07-07-2011 |
20110165052 | Process for Preparation of Copper Containing Molecular Sieves With the CHA Structure, Catalysts, Systems and Methods - Disclosed are processes for the preparation of copper containing molecular sieves with the CHA structure having a silica to alumina mole ratio greater than about 10, wherein the copper exchange step is conducted via wet state exchanged and prior to the coating step and wherein in the copper exchange step a liquid copper solution is used wherein the concentration of copper is in the range of about 0.001 to about 0.25 molar using copper acetate and/or an ammoniacal solution of copper ions as copper source. Catalysts made by the processes, catalyst systems and methods of treating exhaust gas with the molecular sieves and catalysts are also disclosed. | 07-07-2011 |
20110217221 | METHOD AND CATALYST FOR REMOVAL OF NITROGEN OXIDES IN A FLUE GAS - The invention relates to a method and a catalyst for removal of nitrogen oxides in a flue gas from a combustion engine or gas turbine by injecting a reducing agent and reducing the nitrogen oxides in the presence of a catalyst. The catalyst is a zeolite based catalyst on a corrugated monolithic substrate, the substrate has a density of 50-300 g/l and a porosity of at least 50%. The monolithic substrate is a paper of high silica content glass or a paper of E-glass fibre with a layer of diatomaceous earth or a layer of titania, and the catalyst is a Fe-β zeolite. | 09-08-2011 |
20110274607 | VANADIA-SUPPORTED ZEOLITES FOR SCR OF NO BY AMMONIA - The catalytic behaviour of vanadia-supported zeolite catalysts with different SiO | 11-10-2011 |
20120058034 | Zeolite and Redox Oxide Combined Catalyst Body - Extruded honeycomb catalyst bodies and methods of manufacturing same. The catalyst body includes a first oxide selected from the group consisting of tungsten oxides, vanadium oxides, and combinations thereof, a second oxide selected from the group consisting of cerium oxides, lanthanum oxides, zirconium oxides, and combinations thereof, and a zeolite. | 03-08-2012 |
20120087851 | P/S-TM-COMPRISING ZEOLITES FOR DECOMPOSITION OF N2O - The present invention relates to the use of a zeolite catalyst comprising at least one transition metal and in addition sulfur and/or phosphorus atoms for reducing the content of nitrogen oxides in a gas, and also to a process for reducing the content of nitrogen oxides in a gas by bringing this gas into contact with such a zeolite catalyst. | 04-12-2012 |
20120258032 | CATALYZED FILTER FOR TREATING EXHAUST GAS - Provided is a wall-flow filter coated with an SCR catalyst composition, wherein the catalyst composition contains transition metal promoted molecular sieve crystals, and wherein (i) the crystals have a mean crystalline size of about 0.5 μm to about 15 μm, (ii) the crystals are present in said composition as individual crystals, agglomerations having a mean particle size of less than about 15 μm, or a combination of said individual crystals and said agglomerations; and (iii) said molecular sieve is an aluminosilicate or a silico-aluminophosphate of a Framework Type having a maximum ring size of eight tetrahedral atoms. | 10-11-2012 |
20130004398 | Ferrous Zeolite, Method for Producing Ferrous Zeolites, and Method for Catalytically Reducing Nitrous Oxides - Described is an iron-containing zeolite wherein the number of iron sites, based on the zeolite, is greater than the number of cationic positions in the zeolite. Also described is an iron-containing zeolite preparable by gas phase reaction with iron pentacarbonyl, said zeolite having a greater specific surface area than iron-containing zeolites prepared analogously by ion exchange and/or being more hydrothermally stable than iron-containing zeolites prepared analogously by ion exchange, or wherein the number of iron clusters larger than 10 nm is less than 15% by weight, based on the total amount of iron. Further described is a process for preparing an iron-containing zeolitic material, which comprises doping with iron by means of a gas phase reaction using iron pentacarbonyl. Further described is a process for catalytic reduction of nitrogen oxides using catalysts comprising said iron-containing zeolitic materials. | 01-03-2013 |
20130089483 | Cu-CHA/Fe-BEA Mixed Zeolite Catalyst And Process For The Treatment Of NOx In Gas Streams - The present invention relates to a catalyst, which may be used in selective catalytic reduction (SCR), said catalyst comprising one or more zeolites of the BEA structure type, one or more zeolites of the CHA structure type, and optionally one or more zeolites of the MFI structure type, wherein at least part of the one or more zeolites of the BEA structure type contain iron (Fe), wherein at least part of the one or more zeolites of the CHA structure type contain copper (Cu), and wherein at least part of the optional one or more zeolites of the MFI structure type contain iron (Fe). Furthermore, the present invention concerns an exhaust gas treatment system comprising said catalyst as well as a process for the treatment of a gas stream comprising NO using said catalyst as well. | 04-11-2013 |
20130149225 | Process and Apparatus for Eliminating NOx and N2O - A process for removing N | 06-13-2013 |
20130156672 | PROCESS FOR REMOVING NITROUS OXIDE FROM A GAS STREAM - A process is disclosed for the removal of nitrous oxide from a gas stream having a contaminating concentration of nitrous oxide to provide a gas stream with a significantly reduced concentration of nitrous oxide. The process includes passing the feed gas stream through a first heat transfer zone that is in heat exchange relationship with a product stream whereby heat is transferred from the product stream to the feed gas stream to thereby provide a heated gas stream; passing said heated gas stream to a reaction zone containing a N | 06-20-2013 |
20130209341 | PROCESS FOR REMOVING NITROUS OXIDE FROM A GAS STREAM - A process for the removal of nitrous oxide from a gas stream having a contaminating concentration of nitrous oxide to provide a gas stream with a significantly reduced concentration of nitrous oxide is described. The process includes the use of a process system having multiple N2O decomposition reactors each of which contain a nitrous oxide decomposition catalyst and heat transfer units each of which contain a heat sink media that are operatively connected in a particular order and arrangement for use in the process. The gas stream is passed to the process system that is operated for a period of time in a specific operating mode followed by the stopping of such operation and reversal of the process flow. These steps may be repeatedly taken in order to provide for an enhanced energy recovery efficiency a given nitrous oxide destruction removal efficiency. | 08-15-2013 |
20130209342 | PROCESS FOR REMOVING NITROUS OXIDE FROM A GAS STREAM - A process for the removal of nitrous oxide from a gas stream having a contaminating concentration of nitrous oxide to provide a gas stream with a significantly reduced concentration of nitrous oxide is described. The process includes the use of a process system having multiple N | 08-15-2013 |
20130236382 | ZEOLITE SCR CATALYSTS WITH IRON OR COPPER - Cu/mordenite catalysts were found to be highly active for the SCR of NO with NH | 09-12-2013 |
20140044636 | CATALYTIC REDUCTION OF NOx WITH HIGH ACTIVITY CATALYSTS - Methods and systems for selective catalytic reduction of NOx with an activated-carbon-supported metal catalyst at an operating temperature of between about between about 500° C. and about 750° C. An exhaust stream including NOx is introduced to a catalytic reactor having the activated-carbon-supported metal catalyst for NOx reduction of at least 90%. A second catalyst reactor can be provided downstream to remove or convert nitrous oxide as desired. | 02-13-2014 |
20140248203 | Small Pore Molecular Sieve Supported Copper Catalysts Durable Against Lean/Rich Aging for the Reduction of Nitrogen Oxides - A method of using a catalyst comprises exposing a catalyst to at least one reactant in a chemical process. The catalyst comprises copper and a small pore molecular sieve having a maximum ring size of eight tetrahedral atoms. The chemical process undergoes at least one period of exposure to a reducing atmosphere. The catalyst has an initial activity and the catalyst has a final activity after the at least one period of exposure to the reducing atmosphere. The final activity is within 30% of the initial activity at a temperature between 200 and 500° C. | 09-04-2014 |
20140314649 | PROCESS FOR REMOVING NITROGEN OXIDES FROM GAS USING MICROWAVE CATALYTIC REACTION BY MICROWAVE CATALYSIS - A method for removing nitrogen-oxides by microwave assisted catalysis, including: 1) charging a catalyst capable of absorbing and interacting with microwave into a reaction tube of a reactor device, to form a reaction bed; and 2) heating the reaction bed by microwaves; when a temperature of the reaction bed is raised to 100-600° C., passing a gas containing nitrogen-oxides through the reaction bed, and performing a gas-solid reaction between the gas and the catalyst to remove the nitrogen-oxides from the gas. | 10-23-2014 |
20140363359 | DEVICE AND METHOD FOR ELIMINATING NOX AND N2O - A device and a method are described for lowering the content of NO | 12-11-2014 |
20150064088 | ZEOLITE BLEND CATALYSTS FOR TREATING EXHAUST GAS - Provided is an improved catalyst for treating exhaust gas, particularly for selectively reducing NO | 03-05-2015 |
20150367336 | Molecular Sieve Catalyst Compositions, Catalyst Composites, Systems, And Methods - Described is a selective catalytic reduction material comprising a spherical particle including an agglomeration of crystals of a molecular sieve. The catalyst is a crystalline material that is effective to catalyze the selective catalytic reduction of nitrogen oxides in the presence of a reductant at temperatures between 200° C. and 600° C. A method for selectively reducing nitrogen oxides and an exhaust gas treatment system are also described. | 12-24-2015 |
20150367337 | Molecular Sieve Catalyst Compositions, Catalytic Composites, Systems, And Methods - Described is a selective catalytic reduction catalyst comprising a zeolitic framework material of silicon and aluminum atoms, wherein a fraction of the silicon atoms are isomorphously substituted with a tetravalent metal. The catalyst can include a promoter metal such that the catalyst effectively promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H | 12-24-2015 |
20160136576 | ZEOLITE SCR CATALYSTS WITH IRON OR COPPER - Cu/mordenite catalysts were found to be highly active for the SCR of NO with NH | 05-19-2016 |
20160136626 | Combining SCR with PNA for Low Temperature Emission Control - A catalyst article comprises an SCR catalyst and a NOx adsorber catalyst, where each of these catalysts comprise a metal molecular sieve, each with a different metal. The catalyst article can be close coupled with other components to give a NO | 05-19-2016 |