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Fabrication of complex model oxide catalysts: Mo oxide supported on Fe3O4(111)

Bamroongwongdee, Chanut, Bowker, Michael, Carley, Albert Frederick, Davies, Philip Rosser, Davies, Robert J. and Edwards, Dyfan 2013. Fabrication of complex model oxide catalysts: Mo oxide supported on Fe3O4(111). Faraday Discussions 162 , pp. 201-212. 10.1039/c2fd20134h

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Industrial catalysts for the oxidation of methanol to formaldehyde consist of iron molybdate [Fe2(MoO4)3]. Using a variety of techniques we have previously shown that the surface of these catalysts is segregated in MoO3, and in order to understand the relationship between surface structure and reactivity for these systems we have begun a surface science study of this system using model, single crystal oxides. Model catalysts of molybdenum oxide nanoparticles and films on an Fe3O4 (111) single crystal were fabricated by the hot-filament metal oxide deposition technique (HFMOD), where molybdenum oxides were produced using a molybdenum filament heated in an oxygen atmosphere. Low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), and scanning tunnelling microscopy (STM) have been used to investigate molybdenum oxide nanoparticles and films deposited on Fe3O4 (111). The molybdenum oxide film forms in the highest oxidation state, 6+, and is remarkably stable to thermal treatment, remaining on the surface to at least 973 K. However, above ~ 573 K cation mixing begins to occur, forming an iron molybdate structure, but the process is strongly Mo coverage dependent.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1359-6640
Funders: EPSRC
Date of First Compliant Deposit: 30 March 2016
Last Modified: 26 Oct 2021 01:21

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