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用于汽车排放控制的Pd-矿催化剂的自我再生

Y Nishihata¹, J Mizuki, T Akao

¹Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Mikazuki, Sayo-gun, Hyogo 679-5148, Japan. yasuon@spring8.or.jp

|July 12, 2002

概括

一种新的矿催化剂LaFe{0.57) Co{0.38) Pd{0.05) O{3) 在催化转换器中保持了 (Pd) 的高分散度. 这种稳定性是由于结构变化,防止粒子生长,提高长期性能.

科学领域:

材料科学材料科学材料科学
催化剂是一种催化剂.
环境科学环境科学

背景情况:

汽车催化转换器使用贵金属来减少有害排放.
热量和废气波动随着时间的推移降低了催化剂的性能.
新的发动机设计给催化转换器带来了更大的热应力.

研究的目的:

研究汽车应用中的矿基催化剂的长期稳定性和活性.
了解催化剂停用和保留背后的结构机制.

主要方法:

利用X射线衍射和X射线吸收光谱学.
在不同的氧化和还原废气条件下研究了LaFe{0.57) Co{0.38) Pd{0.05) O{3).

主要成果:

矿催化剂证明了 (Pd) 分散的显著保留.
观察到 (Pd) 原子可逆地融入并从矿格子中释放出来.
这种动态结构反应抑制了金属Pd颗粒的聚合和生长.

结论:

(Pd) 在矿结构中的可逆运动是防止催化剂失活的关键.
这种矿催化剂为耐用和高性能汽车催化转换器提供了一个有前途的解决方案.

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