Pd-Doped Perovskite: An Effective Catalyst for Removal of NOx from Lean-Burn Exhausts with High Sulfur Resistance

X. G. Li , C. Chen (1) , C. Liu , H. Xian , L. Guo (2) , J. L. Lv , Z. Jiang , P. Vernoux (3)

1 MATERIAUX - MATERIAUX
2 INGENIERIE - INGENIERIE
3 AIR - AIR

Herein, we report the Pd-doped perovskite La0.7Sr0.3CoO3 as an effective lean NOx trap (LNT) catalyst. This smart perovskite displays excellent NOx reduction activities for lean-burn exhausts (NOx conversion >90%, N-2 selectivity >90%) over a wide operating temperature range (275-400 degrees C), as well as an extremely high sulfur tolerance. Our results evidenced Pd dissolving into or segregating out of perovskite in lean-burn and fuel-rich atmospheres. The segregated metallic Pd from perovskite in fuel-rich atmospheres is crucial for obtaining these promising achievements. These findings provide a new possibility for the application of the Pd-based LNT catalysts.

Domaines: Catalyse; Environnement et Société

X. G. Li, C. Chen, C. Liu, H. Xian, L. Guo, et al.. Pd-Doped Perovskite: An Effective Catalyst for Removal of NOx from Lean-Burn Exhausts with High Sulfur Resistance. ACS Catalysis, 2013, 3, pp.1071-1075. ⟨10.1021/cs400136t⟩. ⟨hal-00861144⟩