Low-temperature conversion of NOx to N2 by zeolite-fixed ammonium ions

被引:62
作者
Richter, M [1 ]
Eckelt, R [1 ]
Parlitz, B [1 ]
Fricke, R [1 ]
机构
[1] Berlin Adlershof EV, Inst Angew Chem, D-12484 Berlin, Germany
关键词
catalytic low temperature conversion; NO reduction; oxygen excess; ammonium ion;
D O I
10.1016/S0926-3373(97)00042-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The selective catalytic reduction (SCR) of NOx in oxygen excess is reported to proceed with good efficiency by NH4+ ions fixed to zeolites at temperatures as low as 373 K. The reaction starts with almost complete reduction of NOx to N-2 under consumption of NH4+ ions thereby converting the zeolite into its H+ form. The consumed NH4+ ions can easily be replenished at reaction temperature by admission of gaseous ammonia. A key step of the reaction sequence is the oxidation of NO to NO2 by O-2 which is catalyzed by the zeolite. Both properties of the zeolite, namely, its storage capacity for NH3 (in the form of NH4+ ions) and its oxidation capability for NO allow the abatement of NOx in exhaust gases at low temperatures and in the presence of oxygen without permanent addition of a reductant. This process is named catalytic low temperature conversion (CLTC) of NOx. (C) 1998 Elsevier Science B.V.
引用
收藏
页码:129 / 146
页数:18
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