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Electronic Irradiation Effect on Bi-Mo-O Catalysts Observed in a Hrtem Study

Published online by Cambridge University Press:  15 February 2011

M. Avalos-Borja ,
D. H. Galvan  and
X. G. Ning
M. Avalos-Borja
Affiliation:
Instituto de Física, UNAM, A. Postal 2681, Ensenada, B.C., 22800, MEXICO.
D. H. Galvan
Affiliation:
Instituto de Física, UNAM, A. Postal 2681, Ensenada, B.C., 22800, MEXICO.
X. G. Ning
Affiliation:
On leave from Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang, 110015, P.R. CHINA.
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Abstract

We studied by high resolution transmission electron microscopy (HRTEM) unsupported bismuth-molybdenum-oxide catalysts. The microscope utilized was a JEOL 4000 EX electron microscope with a resolution better than 0.19 nm (point to point). The image simulation were performed on a personal computer with the aid of a commercial program. With the aid of image simulation it is possible to identify γ-Bi2MoO6 and X-Mo4O11 phases, among several other possibilities that fit the interplanar spacings and angles.

A very important aspect, thermal instability, was proved indirectly in the microscope, by the changes of the particles under the electron beam irradiation at 400 kV. After several minutes of irradiation, the amorphous surface layer was totally reconstructed to crystalline phases.

The fact that we observe many phases in this sample, is certainly deleterious to the catalytic properties, since not all of them are active. Also the sensitivity to the beam indicates that minimum exposure microscopy has to be applied in order to prevent unecessary complications for phase identification.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 404: Symposium J – In Situ Electron and Tunneling Microscopy of Dynamic Processes , 1995 , 195
Copyright
Copyright © Materials Research Society 1996

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