The nature of the molybdenum surface in iron molybdate. The active phase in selective methanol oxidation
| Autor: | David Mora-Fonz, Michael Bowker, Wilm Jones, Catherine Brookes, Giannantonio Cibin, Peter Bernard Wells, Chris Nicklin, Emma K. Gibson, David O. Scanlon, Nikolaos Dimitratos, David J. Morgan, Charles Richard Catlow |
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| Přispěvatelé: | Brookes, Catherine, Wells, Peter P., Dimitratos, Nikolao, Jones, Wilm, Gibson, Emma K., Morgan, David J., Cibin, Giannantonio, Nicklin, Chri, Mora-Fonz, David, Scanlon, David O., Catlow, C.R.A., Bowker, Mike |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
inorganic chemicals
Inorganic chemistry Iron oxide chemistry.chemical_element 02 engineering and technology Molybdate 010402 general chemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound law Phase (matter) TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY Monolayer ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION Organic chemistry Calcination QD Physical and Theoretical Chemistry Electronic Optical and Magnetic Material 021001 nanoscience & nanotechnology 0104 chemical sciences Electronic Optical and Magnetic Materials Surfaces Coatings and Films General Energy Energy (all) chemistry Molybdenum Methanol 0210 nano-technology MathematicsofComputing_DISCRETEMATHEMATICS |
| ISSN: | 1932-7447 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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