Investigation of Urea-SCR at Low Temperatures
| Autor: | Sven Kureti, Sven Füger, Andreas Roppertz |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
Aqueous solution Diesel exhaust Chemistry Inorganic chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Isocyanic acid complex mixtures behavioral disciplines and activities 01 natural sciences Decomposition Catalysis 0104 chemical sciences chemistry.chemical_compound Urea 0210 nano-technology Cyanuric acid Diesel exhaust fluid NOx |
| Zdroj: | Topics in Catalysis. 60:199-203 |
| ISSN: | 1572-9028 1022-5528 |
| DOI: | 10.1007/s11244-016-0597-8 |
| Popis: | This paper addresses the NOx removal from diesel exhaust by using urea-SCR technique with focus on critical operating conditions, particularly low temperatures. The investigations were performed on a special laboratory test bench enabling the supply of aqueous urea solution (“AdBlue”) or gaseous NH3 to practical model exhaust. The SCR tests were made with a commercial V2O5/WO3/TiO2 honeycomb catalyst showing very similar performance between 250 and 400 °C when dosing AdBlue and NH3. However, below 200 °C the activity of urea-SCR was clearly lower than that of NH3-SCR due to incomplete conversion of urea and formation of deposits covering the reactor wall. ATR-IR analyses evidenced that these residues consist of urea as well as cyanuric acid originated from side-reactions of isocyanic acid. Furthermore, ramping the temperature upon urea-SCR forced the deposits towards consecutive reactions mainly resulting in cyanuric acid. Consequently, our study provides insights into the dynamic decomposition behavior or urea-related residues relevant for reliable SCR process in diesel exhaust. |
| Databáze: | OpenAIRE |
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