Braun, Peter and Durner, Bernhard and Rabl, Hans-Peter and Matysik, Frank-Michael (2019) Investigations on the decomposition of AdBlue urea in the liquid phase at low temperatures by an electrochemically induced pH shift. MONATSHEFTE FUR CHEMIE, 150 (9). pp. 1633-1641. ISSN 0026-9247, 1434-4475
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Ammonia-based selective catalytic reduction (SCR) systems are the most widely used technology for reduction of nitrogen oxide emissions from lean-burn engines such as diesel engines. However, at low exhaust temperatures, the SCR process is limited by difficulties in the decomposition of the ammonia precursor urea, which is carried on-board using an aqueous solution "AdBlue". In this study, the decomposition of AdBlue urea induced by electrical current and the resulting associated pH shifts were investigated in a divided cell configuration in the liquid phase. The decomposition was found to be favored in both electrochemical compartments, anodic and cathodic, at temperatures of 60-80 degrees C compared to a reference without electrochemical treatment. In addition to the determination of ammonia contents using an ammonia sensor, IC/HPLC analyses were carried out for each sample. Different side products such as biuret, nitrate, cyanuric acid, ammelide, and others were formed. In the anodic compartment, nitrate formation could be observed due to oxidation of ammonia at the electrode surface. [GRAPHICS] .
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SELECTIVE CATALYTIC-REDUCTION; DOPED MN/TIO2; SCR; NOX; HYDROLYSIS; AMMONIA; CONVERSION; OXIDATION; PRODUCTS; REMOVAL; Catalysis; Diesel Engine; Electrochemistry; In situ pH shift; Thermochemistry |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Instrumentelle Analytik (Prof. Frank-Michael Matysik) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Mar 2020 06:32 |
| Last Modified: | 31 Mar 2020 06:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26363 |
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