Abstract
The selective catalytic reduction (SCR) of NO x in oxygen excess is reported to proceed with good efficiency by NH 4 + ions fixed to zeolites at temperatures as low as 373 K. The reaction starts with almost complete reduction of NO x to N 2 under consumption of NH 4 + ions thereby converting the zeolite into its H + form. The consumed NH 4 + 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 NO 2 by O 2 which is catalyzed by the zeolite. Both properties of the zeolite, namely, its storage capacity for NH 3 (in the form of NH 4 + ions) and its oxidation capability for NO allow the abatement of NO x 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 NO x .
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