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Preparation and characterization of iron-molybdate thin films

Uhlrich, J. J., Sainio, J., Lei, Y., Edwards, Dyfan, Davies, Robert J., Bowker, Michael, Shaikhutdinov, S. and Freund, H.-J. 2011. Preparation and characterization of iron-molybdate thin films. Surface Science 605 (15-16) , pp. 1550-1555. 10.1016/j.susc.2011.05.028

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Mixed Fe–Mo oxides are used in industrial catalytic processes of selective oxidation of methanol to formaldehyde. For better understanding of the structure-reactivity relationships of these catalysts we aim to prepare well-ordered iron–molybdate thin films as model catalysts. Here we have studied Mo deposition onto Fe3O4 (111) thin films produced on Pt(111) as a function of Mo coverage and annealing temperature using LEED, AES, STM and IRAS. At low temperatures, the iron oxide film is covered by Mo = O terminated molybdena nanoparticles. Upon oxidation at elevated temperatures (T > 900 K), Mo species migrate into the film and form new bonds with oxygen in the film. The resulting films maintain the crystal structure of Fe3O4, and the surface undergoes a (√3 × √3)R30° reconstruction. The structure is rationalized in terms of Fe substitution by Mo in the surface layers.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Iron–molybdates; Thin films; Scanning tunneling microscopy; Infrared spectroscopy
Publisher: Elsevier
ISSN: 0039-6028
Last Modified: 04 Jun 2017 02:49

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