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

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1998年 / 15卷 / 1-2期

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

页码：129 / 146

页数：18