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Catalytic Properties of Nanocrystalline WO3−X, Pt/WO3−X and Pd/WO3−X Particles

Published online by Cambridge University Press:  15 February 2011

Chiun-Yen Tung
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, R.O.C
Hong-Ming Lin
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, R.O.C
Chi-Ming Hsu
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, R.O.C
Chao-Cheng Yang
Affiliation:
Department of Humanities and Sciences, Chemistry Division, National Yunlin Institute of Technology, Yunlin County, Taiwan, R. O. C.
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Abstract

The gas-condensation technique is used to produce the nanocrystalline WO3−C, Pt/WO3−X and Pd/WO3−X powders under different atmospheres and pressures. High resolution electron microscope shows there exists well bonded interface between Pt or Pd and WO3−X The WO3−X, Pt/WO3−X and Pd/WO3−x nanocrystals grow into needle shape with plate inside when these asevaporated powders are compacted and sintered at 900 °C for two hours. The plate grows preferentially in {220) plane along < 001 > direction. However, the mean particle size of nanophase Pt and Pd only increases from less than 10 nm to 30 nm and 50 nm, respectively. The gas chromatography results show that nanophase Pt/VO3−X powders have better catalytic effects in converting CO to CO2 than nanophase WO3−X and Pd/WO3−X powders.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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Catalytic Properties of Nanocrystalline WO3−X, Pt/WO3−X and Pd/WO3−X Particles
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