Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-24T08:26:03.989Z Has data issue: false hasContentIssue false
  • English
  • Français

The Partial Oxidation of Methanol by MoO3(010) Surfaces with Controlled Defect Distributions

Published online by Cambridge University Press:  10 February 2011

Richard L. Smith  and
Gregory S. Rohrer
Richard L. Smith
Affiliation:
Carnegie Mellon University, Department of Materials Science and Engineering Pittsburgh, Pennsylvania 15213–3890
Gregory S. Rohrer
Affiliation:
Carnegie Mellon University, Department of Materials Science and Engineering Pittsburgh, Pennsylvania 15213–3890
Get access

Abstract

Atomic force microscopy has been used to determine how MoO3(010) surfaces with controlled defect populations evolve during reactions with MeOH/N2 mixtures. The structural evolution of the freshly cleaved surface is compared to surfaces reduced in 10%H2/N2 at 400 °C. While the freshly cleaved surfaces are flat and nearly ideal, the reduced surfaces contain voids bounded by step loops where Mo atoms in reduced coordination are found. In both cases, reacting the MoO3(010) surface with MeOH/N2 mixtures between 300 and 400 °C leads to H intercalation and the nucleation of acicular precipitates of HxMoO3. On the freshly cleaved surface, the H-bronze phase precipitates uniformly. On the reduced surface, the precipitates form preferentially at the void edges, where undercoordinated Mo atoms are found.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 497: Symposium Z – Recent Advances in Catalytic Materials , 1997 , 53
Copyright
Copyright © Materials Research Society 1998

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

[1] Tatibouët, J.M. and Germain, J.E., J. Catal., 72, 275 (1981).Google Scholar
[2] Chowdhry, U., Ferretti, A., Firment, L.E., Machiels, C.J., Ohuchi, F., Sleight, A.W. and Staley, R.H., Appl. Surf. Sci., 19, 360 (1984).Google Scholar
[3] Volta, J.C. and Tatibouët, J.M., J. Catal, 93, 467 (1985).10.1016/0021-9517(85)90194-0Google Scholar
[4] Bruckman, K., Grabowski, R., Haber, J., Mazurkiewicz, A., Sloczynski, J., and Wiltowski, T., J. Catal., 104, 71 (1987).10.1016/0021-9517(87)90337-XGoogle Scholar
[5] Smith, R.L. and Rohrer, G.S., J. Catal., 163, 12 (1996).10.1006/jcat.1996.0300Google Scholar
[6] Smith, R.L. and Rohrer, G.S., J. Solid State Chem., 124, 104 (1996).10.1006/jssc.1996.0213Google Scholar
[7] Birtill, J.J. and Dickens, P.G., Mat. Res. Bul., 13, 311 (1978).10.1016/0025-5408(78)90008-9Google Scholar
[8] Vergnon, P. and Tatibouët, J.M., Bull. Soc. Chim. Fr., 11–12, 455 (1980).Google Scholar
[9] Guidot, J. and Germain, J.E., React. Kinet. Catal. Lett., 15, 389 (1980).10.1007/BF02074139Google Scholar
[10] Smith, R.L. and Rohrer, G.S., J. Catal., in press.Google Scholar
[11] Bursill, L.A., Proc. Roy. Soc., A311, 267 (1969).Google Scholar
[12] Bursill, L.A., Dowell, W.C.T., Goodman, P., and Tate, N., Acta Cryst., A34, 296 (1974).Google Scholar
[13] Gai, P.L., Phil. Mag. A, 43, 841 (1981).Google Scholar
[14] Gai-Boyes, P.L., Catal. Rev.-Sci. Eng., 34, 1 (1992).Google Scholar
[15] Farneth, W.E., Ohuchi, F., Staley, R.H., Chowdhry, U., and Sleight, A.W., J. Phys. Chem., 89, 2493 (1985).10.1021/j100258a014Google Scholar
[16] Machiels, C.J. and Sleight, A.W. in Proceedings of the 4th International Conference on the Chemistry and Uses of Molybdenum (Barry, H.F. and Mitchell, P.C.H., Eds.), p. 411.Google Scholar