氮氧化物
钙钛矿(结构)
催化作用
稀烧
硫黄
材料科学
兴奋剂
选择性
溶解
化学工程
无机化学
金属
化学
冶金
有机化学
光电子学
燃烧
工程类
作者
Xingang Li,Cheng Chen,Cheng Liu,Hui Xian,Li Guo,Jiaolong Lv,Zheng Jiang,P. Vernoux
摘要
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%, N2 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.
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