Abstract
Abstract For the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) from lean burn diesel engines, NH 3 is used as reducing agent. In the case of V 2 O 5 –WO 3 catalysts supported on TiO 2 (anatase) ceramics, an adsorption of NH 3 on the catalyst surface is required for the SCR reactions. To effectively control the NH 3 supply and to obtain detailed knowledge on the catalyst status, it is crucial to know the current adsorbed amount of ammonia on the catalyst. It is shown for the first time in this study that it is possible to determine the ammonia loading of V 2 O 5 –WO 3 catalysts contactless and in operando by a simple microwave-based approach. This method can be applied for different temperatures. It is possible to determine the stored amount of ammonia independently on the ammonia-to-NO x feed ratio.
Published Version
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