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Liquid-Phase Catalytic Decomposition of Novel Ammonia Precursor Solutions for the Selective Catalytic Reduction of NOx

Peitz, Daniel ; Bernhard, Andreas ; Elsener, Martin ; Kröcher, Oliver

In: Topics in Catalysis, 2013, vol. 56, no. 1-8, p. 19-22

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    Title
    • Liquid-Phase Catalytic Decomposition of Novel Ammonia Precursor Solutions for the Selective Catalytic Reduction of NOx
    Author
    • Peitz, Daniel. Paul Scherrer Institut, OVGA/112, 5232, Villigen, PSI, Switzerland
    • Bernhard, Andreas. Paul Scherrer Institut, OVGA/112, 5232, Villigen, PSI, Switzerland
    • Elsener, Martin. Paul Scherrer Institut, OVGA/112, 5232, Villigen, PSI, Switzerland
    • Kröcher, Oliver. Paul Scherrer Institut, OVGA/112, 5232, Villigen, PSI, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Topics in Catalysis, 2013, vol. 56, no. 1-8, p. 19-22. Springer US; http://www.springer-ny.com
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:321404
    Summary
    Aqueous solutions of NH3-precursor compounds (i.e. urea and methanamide) were catalytically hydrolyzed in the liquid phase by applying a pressure of 50bar during contact with the catalyst in a heated tube. Methanamide could be hydrolyzed on an Au/TiO2 catalyst to yield not only NH3, but also H2. Decomposition of urea under high pressure in the liquid phase could even be achieved without the addition of a catalyst. Due to the large excess of water present during decomposition, side products could be avoided. As the reactor tube is electrically heated, the presented method provides a possibility to reliably transform NH3-precursor compounds into gaseous NH3 independent of the engine exhaust gas temperature. The NH3-flow can be added to the main exhaust duct to enable the selective catalytic reduction of NOx at the light-off of the SCR catalyst