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

Herein, we report the Pd-doped perovskite La 0.7 Sr 0.3 CoO 3 as an effective lean NO x trap (LNT) catalyst. This smart perovskite displays excellent NO x reduction activities for lean-burn exhausts (NO x conversion >90%, N 2 selectivity >90%) over a wide operating temperature range (275–400 °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.