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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	The Nature of the Molybdenum Surface in Iron Molybdate; the Active Phase in Selective Methanol Oxidation Catherine Brookes , Peter Wells , Nikolaos Dimitratos , Wilm Jones , Emma Gibson , David John Morgan , Giannantonio Cibin , Chris Nicklin , David Mora-fonz , David O. Scanlon , C. Richard A. Catlow , Michael Bowker The Journal Of Physical Chemistry C 118 (45) DOI: 10.1021/jp5081753 Diamond Proposal Number(s): [8071] Open Access Show Abstract ▼ Abstract: The surface structure of iron molybdate is of great significance since this is the industrial catalyst for the direct selective oxidation of methanol to formaldehyde. There is a debate concerning whether Fe2(MoO4)3 acts as a benign support for segregated MoO3 or if there is an intrinsic property of the surface structure which facilitates its high catalytic efficacy. This study provides new insights into the structure of this catalyst, identifying a bound terminating layer of octahedral Mo units as the active and selective phase. Here we examine whether only 1 monolayer of Mo on iron oxide alone is efficacious for this reaction. For a 1 ML MoOx shell–Fe2O3 core catalyst the Mo remains at the surface under all calcination procedures while exhibiting high selectivity and activity. The work highlights how catalyst surfaces are significantly different from bulk structures and this difference is crucial for catalyst performance.	Oct 2014

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