10.18453/rosdok_id00003764 Ngo, Anh Binh Anh Binh Ngo http://d-nb.info/gnd/1234175401 Universität Rostock 2021 500 Natural sciences 540 Chemistry & allied sciences 660 Chemical engineering 2021 en http://purl.uni-rostock.de/rosdok/id00003764 urn:nbn:de:gbv:28-rosdok_id00003764-8 This dissertation studies on the effect of HCHO - a side product from the uncompleted combustion of fuel to the selective catalytic reduction of NOx by ammonia. HCHO prefers to react with NH3 to form HCN as the main product, leads to the decrease of NOx conversion and N2 selectivity. In situ FTIR reveals that the high surface acidity of catalyst will create a large enough of NH3 adsorbents for the reaction of HCHO to form HCONH2. In addition, in situ EPR experiments indicate that the high redox property of catalyst also facilitates the rate of HCONH2 formation.