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    • 5. 发明申请
    • METHOD FOR TREATING NOX IN EXHAUST GAS AND SYSTEM THEREFORE
    • 用于处理排气中的NOX的方法和系统
    • US20130202507A1
    • 2013-08-08
    • US12808622
    • 2008-11-10
    • Stephan EchoffRuediger HoyerSusanne PhilippIna GrisstedeWilfried MuellerFriedemann Rohr
    • Stephan EchoffRuediger HoyerSusanne PhilippIna GrisstedeWilfried MuellerFriedemann Rohr
    • B01D53/94
    • B01D53/9418F01N3/0814F01N3/0871F01N3/2066F01N9/00F01N13/0093F01N2430/06Y02T10/22Y02T10/24Y02T10/47
    • The present invention relates to a method for the treatment of an exhaust gas comprising NOx, wherein the method comprises the step of subjecting the exhaust gas to an exhaust gas treatment system comprising, in order of the exhaust stream: (a) a first NOx storage catalytic converter (2, 2′); (b) a catalytic converter (3) for selective catalytic reduction (SCR) downstream of the first NOx storage catalytic converter; and (C) a catalytic converter (4) having oxygen storage capacity downstream of the SCR catalytic converter; wherein the exhaust gas treatment system is operated in alternating rich and lean phases, wherein the rich phase is terminated when the amount of reducing components leaving the first NOx storage catalytic converter is at least 0.05 times the N amount of reducing components consumed by the first NOx storage catalytic converter during the time interval beginning when the air/fuel ratio upstream of the first NOx storage catalytic converter turns from lean to rich conditions and ending when the air/fuel ratio downstream of the first NOx storage catalytic converter turns from lean to rich conditions. Optionally there can be provided a close coupled three-way or diesel oxidation or NOx storage catalytic converter (1, 1′).
    • 本发明涉及一种用于处理包含NOx的排气的方法,其中该方法包括使废气经受排气处理系统的步骤,废气处理系统按排气流的顺序包括:(a)第一NOx储存器 催化转化器(2,2'); (b)用于第一NOx存储催化转化器下游的用于选择性催化还原(SCR)的催化转化器(3); 和(C)在SCR催化转化器的下游具有储氧能力的催化转化器(4); 其中所述废气处理系统在富相和贫相交替的情况下操作,其中当离开所述第一NOx存储催化转化器的还原成分的量为所述第一NOx消耗的所述还原成分的N量的至少0.05倍时,所述富相停止 在第一NOx存储催化转化器的上游的空气/燃料比从稀薄状态转变为富裕条件的时间间隔开始的时间间隔期间,当第一NOx存储催化转化器的下游空气/燃料比率从稀薄状态转变为富裕状态时结束 。 可选地,可以提供紧密耦合的三通或柴油氧化或NOx储存催化转化器(1,1')。