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首页> 外文期刊>Catalysis science & technology >Thermal stabilisation effects of Zr buffer layer on nanometric Rh overlayer catalyst formed on metal foil substrate
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Thermal stabilisation effects of Zr buffer layer on nanometric Rh overlayer catalyst formed on metal foil substrate

机译：Zr缓冲层的热稳定效果在nanometric Rh覆盖物催化剂上形成金属箔衬底

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摘要

A nanometric Rh overlayer formed on a metal foil substrate enables much higher turnover frequencies in NO reduction than the Rh nanoparticles used in conventional three-way catalysis. However, the thermal stability of the Rh overlayer structure needs to be improved for practical applications. In the present study, a Zr buffer layer inserted between the Rh overlayer and the foil substrate efficiently overcame the thermal deterioration at 900 degrees C for 25 h. A honeycomb catalyst consisting of a 7 nm-thick Rh overlayer, a 500 nm-thick Zr buffer layer and a 30 mu m-thick Fe-Cr-Al metal (SUS) foil was prepared by pulsed arc-plasma deposition. After thermal ageing, the Rh/Zr/SUS demonstrated steep light-off characteristics in simulated NOCO-C3H6-O-2 reactions. In contrast, the neat catalyst without the buffer layer (Rh/SUS) was totally deactivated by the Al2O3 passivation layer that formed over the active Rh overlayer. The Zr buffer layer preserves the outermost surface of the Rh overlayer by blocking the interaction between the Rh and Al2O3 layers. Consequently, the Rh surface coverage of Rh/Zr/SUS exceeded 80% after thermal ageing at 900 degrees C, versus almost 0% for Rh/SUS.
机译：一个nanometric Rh覆盖物形成金属箔基质支持更高的营业额频率比Rh没有减少纳米粒子用于传统的三方催化。Rh覆盖物结构需要改进实际的应用程序。Zr缓冲层之间插入Rh覆盖物和箔底物有效地克服了在900度25小时热恶化。蜂窝催化剂组成的7 nm厚的Rh覆盖物,500 nm厚的Zr和缓冲层30亩米Fe-Cr-Al金属箔(SUS)由脉冲电弧等离子体沉积。热老化、Rh / Zr / SUS证明陡峭点火特性的模拟NOCO-C3H6-O-2反应。催化剂没有缓冲层(Rh / SUS)完全释放的氧化铝钝化层,形成了活跃的Rh覆盖物。保留了最外层的Zr缓冲层被挡住了Rh表面覆盖物Rh和氧化铝层间相互作用。因此,Rh表面的报道Rh / Zr /热老化后SUS超过80%900摄氏度,而近0% Rh / SUS。

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