Catalytic activity of Au/TiO2 and Pt/TiO2 nanocatalysts prepared with arc plasma deposition under CO oxidation

Authors: Sang Hoon Kim, Chan-Ho Jung, Nruparaj Sahu, Dahee Park, Jung Yeul Yun, Heonphil Ha, Jeong Young Park

Abstract:
We report the catalytic activity of Au/TiO₂ and Pt/TiO₂ nanocatalysts under CO oxidation fabricated by arc plasma deposition (APD), which is a facile dry process involving no organic materials. Using APD, the catalyst nanoparticles were well dispersed on the TiO₂ powder with an average particle size of 2–4 nm, well below that of nanoparticles prepared by the sol–gel method (10 nm). We found that the average particle size of the dispersed gold nanoparticles can be controlled by changing the plasma discharge voltage of APD. Accordingly, the amount of gold loaded on the TiO₂ powder increased as the discharge voltage increased, but the specific surface area of the Au/TiO₂ samples decreased. As for catalytic reactivity, Au/TiO₂ showed a higher catalytic activity than Pt/TiO2 in CO oxidation. The catalytic activity of the Au/TiO₂ samples showed size dependence where higher catalytic activity occurred on smaller gold nanoparticles. This study suggests that APD is a simple way to fabricate catalytically active nanocatalysts.

Keywords:
Arc plasma deposition
Au and Pt nanoparticles
Nanocatalyst
CO oxidation

Published in: Applied catalysis A: General  (Volume 454, Pages 1-172, 15 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Catalytic activity of Au/TiO2 and Pt/TiO2 nanocatalysts prepared with arc plasma deposition under CO oxidation

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