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Effect of thermal ageing on the structure and catalytic activity of Pd/CeO2 prepared using arc-plasma process

机译:热老化对使用Arc-plasma工艺制备的PD/CEO2结构和催化活性的影响

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摘要

Pd nanoparticles were deposited onto CeO2 powders using an arc-plasma process in order to study their thermal behaviour and catalytic activity for CO oxidation. As-prepared catalyst exhibited a higher catalytic activity than catalysts prepared via conventional wet-impregnation because the metallic state of Pd responsible for CO oxidation activity is abundant. The activity was decreased by thermal ageing at 600 °C in air, which oxidized metallic Pd to the oxide interacting with the surface of CeO2. On the other hand, ageing at 900 °C in 10% H2O/air significantly enhanced the activity, regardless of sintering of CeO2, to show the highest activity, as observed in our previous work for the catalyst prepared by conventional wet-impregnation. The activation by thermal ageing is associated with the thermodynamic dissociation of the oxidic Pd to metallic Pd species at 900 °C.
机译:PD纳米颗粒使用弧胶 - 血浆过程沉积到CEO2粉末上,以研究其热行为和催化活性以进行CO氧化。 制备准备的催化剂表现出比通过常规湿浸染制备的催化剂更高的催化活性,因为负责CO氧化活性的PD的金属状态丰富。 在空气中600°C下的热老化减少了活性,将金属PD氧化为与CEO2表面相互作用的氧化物。 另一方面,在10%H2O/空气中在900°C下的衰老显着增强了活性,无论CEO2的烧结如何,都显示出最高的活性,这是我们先前为传统湿损伤制备的催化剂所观察到的。 热衰老的激活与900°C下的氧化剂PD对金属PD物种的热力学解离有关。

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