Issue 9, 2014

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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
07 Mar 2014
Accepted
12 Apr 2014
First published
14 Apr 2014

Catal. Sci. Technol., 2014,4, 2990-2996

Author version available

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

S. Hinokuma, H. Fujii, Y. Katsuhara, K. Ikeue and M. Machida, Catal. Sci. Technol., 2014, 4, 2990 DOI: 10.1039/C4CY00291A

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