期刊
ACS CATALYSIS
卷 3, 期 6, 页码 1071-1075出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs400136t
关键词
Pd-doped; perovskite; lean-burn; NOx reduction; sulfur resistance
资金
- National Natural Science Foundation of China [U1162103, U1232118]
- Natural Science Foundation of Tianjin [11JCYBJC03700]
- Program for New Century Excellent Talents in University of China [NCET-10-0615]
- Program for Introducing Talents of Discipline to Universities of China [B06006]
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University
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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