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Investigations on the decomposition of AdBlue urea in the liquid phase at low temperatures by an electrochemically induced pH shift

  • 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] .

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Metadaten
Author:Peter Braun, Bernhard Durner, Hans-Peter Rabl, Frank-Michael Matysik
DOI:https://doi.org/10.1007/s00706-019-02406-6
Parent Title (English):Monatshefte für Chemie
Publisher:Springer
Document Type:Article
Language:English
Year of first Publication:2019
Release Date:2022/01/31
Tag:Ammonia; CONVERSION; Catalysis; DOPED MN/TIO2; Diesel Engine; Electrochemistry; HYDROLYSIS; In situ pH shift; NOX; OXIDATION; PRODUCTS; REMOVAL; SCR; SELECTIVE CATALYTIC-REDUCTION; Thermochemistry
Volume:150
Issue:9
First Page:1633
Last Page:1641
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Combustion Engines and Emissions Control Laboratory (CEEC)
Begutachtungsstatus:peer-reviewed
research focus:Energie und Mobilität
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG