Fundamental studies of NOx storage at low temperatures |
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| Authors: | Olsson Louise Jozsa Peter Nilsson Mikael Jobson Edward |
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| Affiliation: | (1) Competence Centre for Catalysis, Chalmers University of Technology, 412 96, Goteborg, Sweden;(2) Department 06130, Volvo Technology Corporation, 405 08, Goteborg, Sweden;(3) Volvo Powertrain Corporation, 405 08, Goteborg, Sweden |
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| Abstract: | A commercial NOx storage catalyst (Pt, BaO and alumina containing) was investigated by temperature programmed desorption (TPD) experiments
in the temperature range 100–400 °C. The catalyst stored a substantial amount of NOx at 100 °C using NO + O2. Nitrites or loosely bound NO species are suggested for this storage, since no NO was oxidised at this low temperature. In
addition, the released NOx during the temperature ramp consisted of mainly NO and at lower temperatures the NO2 dissociation is limited. Water and CO2 was found to decrease the storage substantially, 92% for the NO + O2 adsorption at 100 °C. The total storage for 60 min using NO2 + O2 at 200 °C was similar when introducing CO2 and H2O. However, the initial total uptake of NOx was decreased. Initially we probably formed loosely bound NOx species, which likely are strongly influenced by water and CO2. After longer time periods are barium nitrates probably formed and they can remove the carbonates by forming stable nitrates,
thus resulting in the same total uptake of NOx. |
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| Keywords: | NOx storage NOx storage and reduction (NSR) Lean NOx trap (LNT) Temperature programmed desorption (TPD) Low temperature CO2 H2O Platinum Barium |
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