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Surface Composition of Carburized Tungsten Trioxide and its Catalytic Activity

Published online by Cambridge University Press:  22 February 2011

Masatoshi Nakazawa  and
H. Okamoto
Masatoshi Nakazawa
Affiliation:
Central Research Laboratory, Hitachi Ltd., Tokyo 185, Japan
H. Okamoto
Affiliation:
Central Research Laboratory, Hitachi Ltd., Tokyo 185, Japan
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Abtract

The surface composition and electronic structure of carburized tungsten trioxide are investigated using X-ray photoelectron spectroscopy (XPS). The relationship between the surface composition and the catdlytic activity for methanol electro-oxidation is clarified. The tungsten carbide concentration in the surface layer increases with the carburization time. The formation of tungsten carbide enhances the catalytic activity. On the other hand, the presence of free carbon or tungsten trioxide in the surface layer reduces the activity remarkably. It is also shown that, the higher the electronic density of states near the Fermi level, the higher the catalytic activity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 48: Symposium E – Applied Materials Characterization , 1985 , 85
Copyright
Copyright © Materials Research Society 1985

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References

REFERENCES

1. Toth, L.E., Transition Metal Carbides and Nitrides (Academic Press, New York, 1971).Google Scholar
2. Levy, R.B. and Boudart, M., Science 181(1973)547.Google Scholar
3. Houston, J.E., Laramore, G.H. and Park, R.L., Science 185 (1974)258.CrossRefGoogle Scholar
4. Bennett, L.H., Cuthil, J.R., McAlister, A.T., Erickson, N.E. and Watoson, R.E., Science 184(1974)563.CrossRefGoogle Scholar
5. Colton, R.J., Huang, J.J. and Rabalais, J.W., Chem.Phys. Letters 34(1975)337.Google Scholar
6. Ross, P.N. and Stonehart, P., J.Catalysis 48(1977)42.CrossRefGoogle Scholar
7. Palanker, V.Sh., Gajyev, R.A. and Sokolsky, D.V., Electrochim. Acta 22(1977)133.CrossRefGoogle Scholar
8. Ko, E.I., Benziger, J.B. and Madix, R.J., J.Catalysis 62 (1980)264.CrossRefGoogle Scholar
9. Miles, R., J.Chem.Tech.Biotechnol. 30(1980)35.CrossRefGoogle Scholar
10. Bond, G.C., Catalysis by Metals (Academic Press, New York, 1964).Google Scholar
11. Kudo, T., Kawamura, G. and Okamoto, H., J.Electrochem.Soc. 130(1983)1491.Google Scholar
12. Colton, R.J. and Rabalais, J.W., Inorg.Chem. 15(1976)237.CrossRefGoogle Scholar
13. Ng, K.T. and Hercules, D.M., J.Phys.Chem. 80(1976)2094.CrossRefGoogle Scholar
14. Nakazawa, M. and Okamoto, H., to be published.Google Scholar
15. Schwab, G.M., Disc.Faraday Soc. 8(1950)166.Google Scholar
16. Dowden, D.A. and Reynolds, P.W., Disc.Faruday Soc. 8(1950) 184.Google Scholar
17. Sinfelt, J.H., Carter, J.L. and Yates, D.J.C., J.Catalysis 24(1972)283.CrossRefGoogle Scholar