Pd-Doped Perovskite: An Effective Catalyst for Removal of NOx from Lean-Burn Exhausts with High Sulfur Resistance
Pd-Doped Perovskite: An Effective Catalyst for Removal of NOx from Lean-Burn Exhausts with High Sulfur Resistance
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DOI：
10.1021/cs400136t
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发表时间：
2013-04
期刊：
影响因子：
12.9
通讯作者：
Xingang Li;Chen Cheng;Cheng Liu;Hui Xian;Li Guo;Jiao-Long Lv;Zheng Jiang;P. Vernoux
中科院分区：
文献类型：
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作者：
Xingang Li;Chen Cheng;Cheng Liu;Hui Xian;Li Guo;Jiao-Long Lv;Zheng Jiang;P. Vernoux
在这里，我们报告的Pd掺杂的钙钛矿La0.7Sr0.3CoO3作为一个有效的贫NOx捕集（LNT）催化剂。这种智能钙钛矿在宽的工作温度范围（275-400摄氏度）内对稀燃废气表现出优异的NOx还原活性（NOx转化率> 90%，N-2选择性>90%），以及极高的耐硫性。我们的研究结果表明，Pd溶解或分离的钙钛矿在贫燃和富燃料的气氛。在富燃料气氛中从钙钛矿中分离的金属Pd对于获得这些有前途的成就至关重要。这些发现为钯基LNT催化剂的应用提供了新的可能性。
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.