Catalytic activity of Au/TiO2 and Pt/TiO2 nanocatalysts prepared with arc plasma deposition under CO oxidation
- Catalytic activity of Au/TiO2 and Pt/TiO2 nanocatalysts prepared with arc plasma deposition under CO oxidation
- 김상훈; 정찬호; Nruparaj Sahu; 박다희; 윤중열; 하헌필; 박정영
- Arc plasma deposition; Au and Pt nanoparticles; Nanocatalyst; CO oxidation
- Issue Date
- Applied catalysis A, General
- VOL 454, 53-58
- 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.
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