The effects of oscillatory feeding of CO and O2 on the performance of a monolithic catalytic converter of automobile exhaust gas: a modelling study |
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| Affiliation: | 1. Ghent University, Laboratory for Chemical Technology, Ghent B-9052, Belgium;2. Norwegian University of Science and Technology (NTNU), Department of Chemical Engineering, N-7491 Trondheim, Norway;3. SINTEF Materials and Chemistry, Oil and Gas Process Technology, Sem Sælands vei 2A, N-7491 Trondheim, Norway;1. Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland;2. Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;3. Academic Centre for Materials and Nanotechnology AGH, Mickiewicza 30, 30-059 Krakow, Poland;1. Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China;2. Institute of Coordination Bond Metrology and Engineering, College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;3. Shanghai Industrial Technology Institute, Shanghai, China;4. Wilson, Nanocs, Inc., New York, USA;1. Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, 2601, Australia;2. CSIRO Land and Water, Black Mountain, Canberra, Australian Capital Territory, 2601, Australia |
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| Abstract: | A monolithic catalytic converter of automobile exhaust gas was modelled in order to assess the effects of oscillatory feeding on the performance of the reactor with respect to CO oxidation by O2. Simulations were performed with an oscillating feed composition of CO and O2. The influence of frequency, amplitude, phase angle and ratio of reactants in the feed on the time average CO conversion was investigated. An improvement relative to the steady state conversion of 10% maximum is obtained at temperatures below the light-off temperature, at frequencies below 0.1 Hz and an amplitude of 15%. The reverse effect is obtained from temperatures slightly above the light-off temperature upwards. These effects are strongest when CO and O2 oscillate in counterphase. The explanation for this effect is given in terms of strongly changing surface coverage during cycling of the feed concentrations. |
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