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The comparative analysis of catalytic properties of Group 11 elements in NOx reduction by hydrocarbons in the presence of oxygen
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Motor Transport Institute, ul. Jagiellońska 80, 03-301 Warsaw, Poland
Warsaw University of Technology, Faculty of Automotive and Construction Machinery Engineering, Institute of Vehicles and Construction Machinery Engineering, ul. Narbutta 84, 02-524 Warsaw, Poland
Publication date: 2022-03-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2022;24(1):170-176
  • The structure of metal monolith models coated with the Al2O3-SiO2 carrier was discussed.
  • The surface topography of the Al2O3-SiO2 carrier was assessed based on SEM images and acidity tests of its surface using the ammonia desorption method, including measurements of the specific surface using the BET method and porosity of the catalytic carrier using the BJH method.
  • The results of NO2, NO, and C3H6 conversion tests as well as CO and N2O formation were analysed and assessed in the developed reactors located in an electric tubular furnace, depending on the NOx conversion temperature at a constant dose of the reducing agent (C3H6).
NOx emission reduction in diesel engines can be achieved by using catalytic reactors reducing nitrogen oxides, including NH3-SCR and possibly also HC-SCR reactors. Reactors using ammonia achieve large conversion rates but cause a lot of operational problems. For this reason, the interest in reactors using hydrocarbons and their derivatives to reduce NOx has increased. Such reactors are the ones using metals from Group 11 (coinage metals) such as Cu, Ag and Au placed on an Al2O3-SiO2 carrier as active materials. The article characterizes the porosity and acidity of the carrier surface. Conversion of NO2, NO and propene as well as the formation of CO and N2O depending on the temperature at constant dosing of propene on a carrier covered with Cu, Ag and Au with a metal content of 4 g/dm3 were evaluated. The results of the tests showed that the tested Group 11 elements can be the basis for further experiments related to the development of this exhaust fumes cleaning technology for diesel engines.
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