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Reduction of NOx in Lean Exhaust by Selective NOx-Recirculation (SNR-Technique) Part II: NOx Storage Materials
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Abstract
Selective NOx recirculation (SNR), involving adsorption, selective external recirculation and decomposition of the NOx by the combustion process, is itself a promising technique to abate NOx emissions. Three types of materials containing Ba: barium aluminate, barium tin perovskite and barium Y-zeolites have been developed to adsorb NOx under lean-burn or Diesel conditions, with or without the presence of S02. All these materials adsorb NO2 selectively (lean-burn conditions), and store it as nitrate/nitrite species. The desorption takes place by decomposition of these species at higher temperatures. Nitrate formation implies also sulfate formation in the presence of SO2 and SO3, while the NO2/SO2 competition governs the poisoning of such catalysts.
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Authors
- E. Chaize - Johnson Matthey
- D. E. Webster - Johnson Matthey
- B. Krutzsch - Daimler-Benz AG
- G. Wenninger - Daimler-Benz AG
- M. Weibel - Daimler-Benz AG
- Sh. Hodjati - LERCSI-ECPM
- C. Petit - LERCSI-ECPM
- V. Pitchon - LERCSI-ECPM
- A. Kiennemann - LERCSI-ECPM
- R. Loenders - C.O.K. K.U.
- 0. Monticelli - C.O.K. K.U.
- P. A. Jacobs - C.O.K. K.U.
- J. A. Martens - C.O.K. K.U.
- B. Kasemo
Citation
Chaize, E., Webster, D., Krutzsch, B., Wenninger, G. et al., "Reduction of NOx in Lean Exhaust by Selective NOx-Recirculation (SNR-Technique) Part II: NOx Storage Materials," SAE Technical Paper 982593, 1998, https://doi.org/10.4271/982593.Also In
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