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Influence of Mn and Fe Addition on the NO x Storage–Reduction Properties and SO2 Poisoning of a Pt/Ba/Al2O3 Model Catalyst

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Abstract

This work deals with the effect of Mn or Fe addition on the NO x storage–reduction properties of a Pt/Ba/Al2O3 model catalyst. NO x storage capacity, SO2 poisoning and regeneration and NO x removal efficiency under rich/lean cycling conditions are studied. Fe addition to Pt/Ba/Al2O3 leads only to a small increase of NO x storage capacity, and more interestingly, to a better sulfur removal due to the inhibition of bulk barium sulfate formation. Unfortunately, the NO x storage property cannot be fully recovered. Moreover, Fe addition results in a decrease in the NO x removal efficiency. Mn addition also improves the NO x storage capacity, but no significant influence on the sulfur elimination is observed. Mn-doped catalyst does not improve the NO x removal efficiency, but NH3 selectivity is found to drastically decrease at 400 °C, from 20 to 3%. In addition, the NO x conversion can be improved at higher H2 concentration in the rich pulse, always keeping NH3 selectivity at low level.

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Correspondence to X. Courtois.

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Lê, P.N., Corbos, E.C., Courtois, X. et al. Influence of Mn and Fe Addition on the NO x Storage–Reduction Properties and SO2 Poisoning of a Pt/Ba/Al2O3 Model Catalyst. Top Catal 52, 1771 (2009). https://doi.org/10.1007/s11244-009-9345-7

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Keywords

  • NO x
  • Storage
  • Reduction
  • SO2 poisoning
  • Pt
  • Ba
  • Fe
  • Mn