T5.1.2 - Ammonia flue gas sensors for SCR applications: A comparison between zeolite-based capacitive sensors and mixed-potential sensors utilizing vanadia-based electrodes
- Event
- EUROSENSORS XXXVII
2025-09-07 - 2025-09-10
Wroclaw - Band
- Lectures
- Chapter
- T5.1 - Gas Sensors 3
- Author(s)
- R. Moos, T. Wöhrl, N. Donker, D. Schönauer-Kamin, G. Hagen - University of Bayreuth, Bayreuth (Germany)
- Pages
- 124 - 125
- DOI
- 10.5162/EUROSENSORS2025/T5.1.2
- ISBN
- 978-3-910600-07-2
- Price
- free
Abstract
Two different, planar, and very selective ammonia sensor types are compared in this study with regard to their applicability in flue gas from biomass combustion processes: a YSZ-based mixed potential sensor and a zeolite-based capacitive sensor. Both are operated at several hundred °C. The zeolite sensor shows a small cross-sensitivity to water vapor, whereas the signal of the mixed-potential sensor depends on O₂, especially at lower oxygen concentrations. In both cases the signal can be corrected by a lambda-probe. Both sensors behave well in real exhausts, both in flue gas and in real engine exhausts.