Reduction of NOx in Lean Exhaust by Selective NOx-Recirculation (SNR-Technique) Part II: NOx Storage Materials 982593
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.
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. Download Citation
E. Chaize, D. E. Webster, B. Krutzsch, G. Wenninger, M. Weibel, Sh. Hodjati, C. Petit, V. Pitchon, A. Kiennemann, R. Loenders, 0. Monticelli, P. A. Jacobs, J. A. Martens, B. Kasemo
Johnson Matthey, Daimler-Benz AG, LERCSI-ECPM, C.O.K. K.U.
International Fall Fuels and Lubricants Meeting and Exposition
Direct Injection: Engines, Emissions, and Aftertreatment-SP-1399, SAE 1998 Transactions - Journal of Fuels and Lubricants-V107-4