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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
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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

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References

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