摘要:
Disclosed herein is a system for reducing NOx emissions comprising a fuel tank in fluid communication with a fuel converter, wherein the fuel converter is located down stream of the fuel tank and wherein the fuel converter comprises a catalyst composition that is operative to continuously convert heavy hydrocarbon molecules having 9 or more carbon atoms per molecule into light hydrocarbon molecules having 8 or less carbon atoms per molecule; a selective catalytic reduction catalyst reactor in fluid communication with the fuel converter and located downstream of the fuel converter; and an engine in fluid communication with the fuel tank and the selective catalytic reduction catalyst reactor, wherein the engine is located downstream of the fuel tank and upstream of the selective catalytic reduction catalyst reactor.
摘要:
A method for assembling a gas turbine engine includes providing at least one combustor assembly defining a combustion chamber. At least one fuel nozzle is positioned at a forward end of the combustion chamber. The at least one fuel nozzle is configured to inject a premixed fuel/air mixture into the combustion chamber. A catalytic material is applied to at least a portion of the at least one fuel nozzle.
摘要:
Method and system for emission control of a compression ignition locomotive engine. The method includes measuring an actual power level of the engine, comparing a desired power level with the actual power level of the engine; implementing a combustion strategy based on the comparing of the desired and the actual power levels; and implementing an emission strategy based on the combustion strategy. The emission strategy is intended to attain a predetermined emission level in the exhaust from the engine.
摘要:
The disclosed embodiments relate to a method and system for regeneration of a catalyst. The system includes an engine that creates an exhaust stream and a fuel supply adapted to supply a fuel stream to the engine. A reactor includes a catalyst and is in fluid communication with the engine to receive the exhaust stream. A sensor senses a system parameter and produces a signal corresponding to the system parameter. A controller receives the signal and directs at least a portion of the exhaust stream or at least a portion of the fuel stream to the catalyst to control a regeneration operation based on a value of the system parameter sensed by the sensor.
摘要:
A gas sensor device including a semiconductor substrate; one or more catalytic gate-electrodes deposited on a surface of the semiconductor substrate; one or more ohmic contacts deposited on the surface of the semiconductor substrate and a passivation layer deposited on at least a portion of the surface; wherein the semiconductor substrate includes a material selected from the group consisting of silicon carbide, diamond, Group III nitrides, alloys of Group III nitrides, zinc oxide, and any combinations thereof.
摘要:
A catalyst system comprising a catalyst and a reductant is disclosed. The catalyst comprises a metal oxide catalyst support, a catalytic metal oxide, and a promoting metal. The catalytic metal oxide comprises gallium oxide, indium oxide or a combination of the two. The promoting metal comprises at least one of silver, cobalt, vanadium, molybdenum, tungsten, zinc, tin and bismuth. The catalyst comprises about 5 to about 31 mol % catalytic metal oxide and about 0.5 to about 9 mol % promoting metal. The reductant comprises a fluid hydrocarbon having at least 4 carbon atoms. Also disclosed is a process for reducing NOx to N2 using the disclosed catalyst system by mixing NOx with a reductant and passing the mixture through a catalyst of the disclosed catalyst system.
摘要翻译:公开了一种包含催化剂和还原剂的催化剂体系。 催化剂包括金属氧化物催化剂载体,催化金属氧化物和促进金属。 催化金属氧化物包括氧化镓,氧化铟或两者的组合。 促进金属包括银,钴,钒,钼,钨,锌,锡和铋中的至少一种。 催化剂包含约5至约31摩尔%的催化金属氧化物和约0.5至约9摩尔%的促进金属。 还原剂包括具有至少4个碳原子的流体烃。 还公开了使用公开的催化剂体系通过将NO x x与还原剂混合并使混合物通过的方法将NO 2 x 2还原为N 2 所公开的催化剂体系的催化剂。
摘要:
A method comprises injecting a reductant stream comprising a hydrocarbon reductant and water into an exhaust chamber comprising a nitrogen oxide-containing exhaust stream; contacting a composition comprising the reductant stream and exhaust stream with a catalyst; and decreasing a concentration of the nitrogen oxide in the composition comprising the reductant stream and exhaust stream. An exhaust stream treatment system, comprises an exhaust chamber comprising a catalyst; an exhaust stream comprising a nitrogen oxide; and a reductant stream comprising a hydrocarbon reductant and water.
摘要:
Brominated hydroxyaromatic compounds such as p-bromophenol are prepared by contacting a hydroxyaromatic compound with oxygen and a bromine source such as hydrogen bromide or an alkali metal or alkaline earth metal bromide in an acidic medium, in the presence of elemental copper or a copper compound as catalyst. The brominated product of this reaction may be converted alternately to a dihydroxyaromatic compound such as hydroquinone by hydrolyses, or a dihydroxybiphenyl compound such as 4,4′-dihydroxybiphenyl by reductive coupling.
摘要:
The present invention is directed to a method for reducing the percent decomposition of an aromatic carbonate in a first reaction mixture comprising the aromatic carbonate, the method comprising the step of adding at least one decomposition-reducing additive to the first reaction mixture, so as to produce a second reaction mixture in which the percent of the aromatic carbonate present in the second reaction mixture after a predetermined amount of time is greater than the percent of the aromatic carbonate that would be present in the first reaction mixture in the absence of adding the decomposition-reducing additive, after the same predetermined amount of time.
摘要:
A catalyst system for the reduction of NOx comprises a catalyst comprising a metal oxide catalyst support, a catalytic metal oxide comprising at least one of gallium oxide or silver oxide, and at least one promoting metal selected from the group consisting of silver, cobalt, molybdenum, tungsten, indium, bismuth and mixtures thereof. The catalyst system further comprises a gas stream comprising an organic reductant, and a compound comprising sulfur. A method for reducing NOx utilizing the said catalyst system is also provided.