Effect of Ammonium Formate and Mixtures of Urea and Ammonium Formate on Low Temperature Activity of SCR Systems 2005-01-1856
The urea based SCR technology will face problems with the high freezing point (-11°C) of the reductant. In many parts of the world temperatures regularly fall much lower than this. With ammonium formate-urea solution the freezing point can be as low as - 30 °C.
The reduction capacity of various ammonium formate solutions and its mixtures with urea were studied. When using ammonium formate and its mixtures as reductant in SCR experiments a significant improvement in the DeNOx activity in the low temperature operation was seen. In general in the engine experiments the ammonium formate-urea mixtures showed a reduction capacity comparable to standard urea.
Citation: Solla, A., Westerholm, M., Söderström, C., Tormonen, K. et al., "Effect of Ammonium Formate and Mixtures of Urea and Ammonium Formate on Low Temperature Activity of SCR Systems," SAE Technical Paper 2005-01-1856, 2005, https://doi.org/10.4271/2005-01-1856. Download Citation
Anu Solla, Mårten Westerholm, Christer Söderström, Kauko Tormonen, Timo Härmä, Timo Nissinen, Jari Kukkonen
VTT Technical Research Centre of Finland, Kemira Oy, Finland
SAE 2005 World Congress & Exhibition
Diesel Exhaust Emission Control 2005-SP-1942, SAE 2005 Transactions Journal of Fuels and Lubricants-V114-4