دورية أكاديمية
Radio-Frequency-Based NH3-Selective Catalytic Reduction Catalyst Control: Studies on Temperature Dependency and Humidity Influences
| العنوان: | Radio-Frequency-Based NH3-Selective Catalytic Reduction Catalyst Control: Studies on Temperature Dependency and Humidity Influences |
|---|---|
| المؤلفون: | Markus Dietrich, Gunter Hagen, Willibald Reitmeier, Katharina Burger, Markus Hien, Philippe Grass, David Kubinski, Jaco Visser, Ralf Moos |
| المصدر: | Sensors, Vol 17, Iss 7, p 1615 (2017) |
| بيانات النشر: | MDPI AG, 2017. |
| سنة النشر: | 2017 |
| المجموعة: | LCC:Chemical technology |
| مصطلحات موضوعية: | radio-frequency (RF), NH3 SCR, NH3 storage, direct control, microwave cavity perturbation, exhaust gas sensor, cold start, Chemical technology, TP1-1185 |
| الوصف: | The upcoming more stringent automotive emission legislations and current developments have promoted new technologies for more precise and reliable catalyst control. For this purpose, radio-frequency-based (RF) catalyst state determination offers the only approach for directly measuring the NH3 loading on selective catalytic reduction (SCR) catalysts and the state of other catalysts and filter systems. Recently, the ability of this technique to directly control the urea dosing on a current NH3 storing zeolite catalyst has been demonstrated on an engine dynamometer for the first time and this paper continues that work. Therefore, a well-known serial-type and zeolite-based SCR catalyst (Cu-SSZ-13) was investigated under deliberately chosen high space velocities. At first, the full functionality of the RF system with Cu-SSZ-13 as sample was tested successfully. By direct RF-based NH3 storage control, the influence of the storage degree on the catalyst performance, i.e., on NOx conversion and NH3 slip, was investigated in a temperature range between 250 and 400 °C. For each operation point, an ideal and a critical NH3 storage degree was found and analyzed in the whole temperature range. Based on the data of all experimental runs, temperature dependent calibration functions were developed as a basis for upcoming tests under transient conditions. Additionally, the influence of exhaust humidity was observed with special focus on cold start water and its effects to the RF signals. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1424-8220 17071615 |
| Relation: | https://www.mdpi.com/1424-8220/17/7/1615; https://doaj.org/toc/1424-8220 |
| DOI: | 10.3390/s17071615 |
| URL الوصول: | https://doaj.org/article/671d67f6a6a34c839ef0d5bf494b253c |
| رقم الأكسشن: | edsdoj.671d67f6a6a34c839ef0d5bf494b253c |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 14248220 17071615 |
|---|---|
| DOI: | 10.3390/s17071615 |