摘要:
The present invention provides a catalyst which can sufficiently remove nitrogen oxides in an exhaust gas. The catalyst for removing nitrogen oxides to achieve an object of the present invention includes a monolithic support which is coated with a lower layer containing a catalytic component A comprising cerium oxide and an upper layer containing a catalytic component B comprising at least one kind of metal selected from a group consisting of copper, manganese, iron, cobalt and nickel or a compound thereof, and zeolite.
摘要:
While the amount of PM building up in a particulate filter (DPF) is increasing (until reaching a DPF regeneration start determination value Thpms), one or both of an EGR amount reduction control in which an EGR amount to be recirculated into an air intake system is reduced so that the amount of NOx in exhaust gas increases, and a NOx release control in which a NOx storage catalyst is caused to release NOx, are executed to increase the amount of NO 2 supplied to the particulate filter, whereby the PM buildup rate of the particulate filter is reduced, and therefore, the regeneration interval of the DPF is increased.
摘要:
A method and apparatus for the removal of NO 2 emission from a lean burn compression ignition engine, wherein NO 2 containing engine exhaust gas is brought in contact with a catalyst being active in the reduction of NO 2 to NO and comprising at least one platinum group metal with the proviso that the platinum metal is not platinum and at least one redox active metal oxide and thereby reducing NO 2 contained in the exhaust gas to NO by reaction with CO, hydrocarbons and/or soot being present in the exhaust gas.
摘要翻译:一种用于从贫燃压燃式发动机除去NO 2排放,worin NO 2含发动机废气与催化剂接触时是在NO 2 NO的还原活性,并且包含至少一种铂族金属的方法和装置 金属,条件所做的铂金属不是铂和至少一种氧化还原活性的金属氧化物,从而减少包含在废气中的NO 2通过与CO,碳氢化合物和/或煤烟存在于废气中的反应为NO。
摘要:
The invention refers to a catalyst for assisting solid particulate matter (soot) combustion, in particular for the catalytic coating of a Diesel particulate filter (DPF), having a platinum group metal (PGM) component and a metal oxide component. The metal oxide component can be CuO-La 2 CuO 4 , and the PGM component can be Pt, Pt-Pd or Pd. This catalytic composition is allowing to decrease NO 2 emissions during regeneration of catalyzed DPF while showing comparable or even better activity in soot oxidation regarding reference state-of- the-art CDPFs having higher/comparable PGM loading. The addition of cobalt oxide or cobalt and iron oxides to this formulation further decreases NO 2 emission to the same/lower level than for non-catalyzed or fuel-additive DPFs while still keeping the high activity in soot oxidation. The new catalysts revealed high stability against deactivation during the most severe regenerations.
摘要:
Disclosed are an apparatus and a method for treating exhaust gas. The apparatus includes a pipe (2) for providing a flow path of the exhaust gas containing nitrogen dioxide from a stationary source combustion process using gases as a fuel. One or more nozzles (4) are installed in the pipe (2), which can spray air and a reducing or an oxidizing agent to the exhaust gas flowing in the pipe (2). Additionally, a storage tank (6) is installed to store the reducing or oxidizing agent therein. Furthermore, an injection pump (8) is connected to the storage tank (6) and nozzle (4) at a position between the storage tank (6) and nozzle (4) to feed the reducing or oxidizing agent from the storage tank (6) to the nozzle (4), and an air pump (10) is connected to the nozzle (4) to feed the air into the pipe (2).
摘要:
A diesel engine aftertreatment exhaust system uses catalyzed soot filters for particulate matter reduction and urea SCR catalysts for NOx reduction on diesel engines in a combined system to lower particulate matter and NOx at the same time. With this integral emission control system, diesel engines are able to meet ultra low emission standards.
摘要:
An apparatus for, and a method of, purifying exhaust gas emitted from an internal combustion engine reduces fuel consumption under a lean operating condition and generates high torque under a rich operating condition without deteriorating the cleanness of exhaust gas and the driveability of the engine. The apparatus and method improve the durability of a variable valve timing mechanism of the engine. The engine operation involves lean and rich operating conditions. The variable valve timing mechanism (92) of the apparatus changes the open and close timing of at least one of intake valve (24) and exhaust valve (26) of the engine. The apparatus further has a catalytic converter (38) in an exhaust system, to occlude NOx under the lean operating condition and discharge and reduce the occluded NOx under the rich operating condition. The apparatus also has a prohibition unit (70) for prohibiting the variable valve timing mechanism (92) from changing the valve open and close timing of the valves when the air-fuel ratio of the engine is changed from lean to rich to discharge and reduce the occluded NOx.
摘要:
An apparatus for, and a method of, purifying exhaust gas emitted from an internal combustion engine reduces fuel consumption under a lean operating condition and generates high torque under a rich operating condition without deteriorating the cleanness of exhaust gas and the driveability of the engine. The apparatus and method improve the durability of a variable valve timing mechanism of the engine. The engine operation involves lean and rich operating conditions. The variable valve timing mechanism (92) of the apparatus changes the open and close timing of at least one of intake valve (24) and exhaust valve (26) of the engine. The apparatus further has a catalytic converter (38) in an exhaust system, to occlude NOx under the lean operating condition and discharge and reduce the occluded NOx under the rich operating condition. The apparatus also has a prohibition unit (70) for prohibiting the variable valve timing mechanism (92) from changing the valve open and close timing of the valves when the air-fuel ratio of the engine is changed from lean to rich to discharge and reduce the occluded NOx.