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Catalytic properties of nanocrystalline WO3−x, Pt/WO3−x, and Pd/WO3−x particles

Published online by Cambridge University Press:  03 March 2011

Hong-Ming Lin ,
Chiun-Yen Tung ,
Chi-Ming Hsu  and
Pee-Yew Lee
Hong-Ming Lin
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, Republic of China
Chiun-Yen Tung
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, Republic of China
Chi-Ming Hsu
Affiliation:
Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan, Republic of China
Pee-Yew Lee
Affiliation:
Graduate Institute of Marine Muterials Engineering, National Taiwan Ocean University, Keelung, Taiwan, Republic of China
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Abstract

The gas-condensation technique is used to produce the nanocrystalline (NC) WO3−x, Pt/WO3−x, and Pd/WO3−x powders under different atmosphere and pressure. HRTEM images show that a coherently bonded interface exists between Pt or Pd and WO3−x. The nanocrystal WO3−x, Pt/WO3−x, and Pd/WO3−x grow into a needle shape with a plate inside when these as-evaporated powders are compacted and sintered at 900 °C for 2 h. The plate grows preferentially in {220} plane along the 〈0011〉 direction. However, the mean particle size of nanophase Pt and Pd increases only from <10 nm to 30 nm and 50 nm, respectively. The results of CO oxidation show that nanophase Pt/WO3−x powders have better catalytic effects on converting CO to CO2 than nanophase WO3−x and Pd/WO3−x powders.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1115 - 1119
Copyright
Copyright © Materials Research Society 1995

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References

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