4.8 Article

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

Journal

ACS CATALYSIS
Volume 3, Issue 6, Pages 1071-1075

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/cs400136t

Keywords

Pd-doped; perovskite; lean-burn; NOx reduction; sulfur resistance

Funding

  1. National Natural Science Foundation of China [U1162103, U1232118]
  2. Natural Science Foundation of Tianjin [11JCYBJC03700]
  3. Program for New Century Excellent Talents in University of China [NCET-10-0615]
  4. Program for Introducing Talents of Discipline to Universities of China [B06006]
  5. Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University

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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.

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