Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-30T21:05:07.204Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Engle, T. and Ertl, G., in The Chemical Physics of Surfaces and Heterogeneous Catalysis, edited by Woodruff, P. and King, D. A. (1982), Vol. 4, p. 73.Google Scholar
2Behm, R. J., Ertl, G., Christmann, K., and Van Hove, M. A., J. Chem. Phys. 73, 2984 (1980).CrossRefGoogle Scholar
3Baro, A. M. and Ibach, H., J. Chem. Phys. 71, 4812 (1979).CrossRefGoogle Scholar
4Campbell, C. T., Ertl, G., Kuipers, H., and Segner, , J. Surf. Sci. 107, 220 (1981).CrossRefGoogle Scholar
5Engle, T. and Ertl, G., J. Chem. Phys. 69, 1267 (1978).CrossRefGoogle Scholar
6Matsushima, T., J. Catalysis 55, 337 (1978); Surf. Sci. 79, 63 (1979).CrossRefGoogle Scholar
7Hopster, H., Ibach, H., and Comsa, G., J. Catalysis 46, 37 (1977).CrossRefGoogle Scholar
8Ladas, S., Poppa, H., and Boudart, M., Surf. Sci. 102, 151 (1981).CrossRefGoogle Scholar
9Cant, N. W., Hicks, P. C., and Lennon, B. S., J. Catalysis, 54, 372 (1978).CrossRefGoogle Scholar
10Nicolau, C., Tom, H. G., and Pobichka, E., Trans. Faraday Soc. 55, 1430 (1959).CrossRefGoogle Scholar
11Schwab, G. M., Surf. Sci. 13, 198 (1969).CrossRefGoogle Scholar
12Schwab, G. M. and Zettler, H., Chimia 23, 489 (1969).Google Scholar
13Lin, H-M., Hsieh, S-H., Lee, P-Y., Lai, M-S., and Wu, J-S., Mater. Chem. Phys. 34, 205–213 (1993).Google Scholar
14Suryanarayana, C. and Fores, F. H., Metall. Trans. A 23A, 1071–1081 (1992).CrossRefGoogle Scholar
15Fores, F. H. and Suryanarayana, C., J. Metals, 12–17 (1989).Google Scholar