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. 2011 Aug 25;11(9):8261–8280. doi: 10.3390/s110908261

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 7. — Time dependent results of a stepwise NO_x loading experiment. Experimental data: 320 °C; 14 pulses with 2,750 ppm NO_x for 120 s each (NO_x loading), followed by NO_x pauses of 540 s. (a) λ upstream and downstream of the catalyst, measured by the UEGO sensor. (b) Signals of the impedimetric catalyst sensors (S1, S2, and S3) mounted equidistantly in the catalyst volume. (c) Calculated NO_x loading according to Equation (4). (d) Microwave cavity resonance frequency.