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Citation: Pip Hellier, Peter P. Wells, Michael Bowker. Methanol oxidation over shell-core MO_x/Fe₂O₃ (M=Mo, V, Nb) catalysts[J]. Chinese Journal of Catalysis, ;2019, 40(11): 1686-1692. doi: S1872-2067(19)63350-4 shu

Methanol oxidation over shell-core MO_x/Fe₂O₃ (M=Mo, V, Nb) catalysts

a UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, UK;
b School of Chemistry, Cardiff University, Cardiff, UK;
c School of Chemistry, University of Southampton, Southampton, UK;
d Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, UK

Received Date: 31 January 2019
Revised Date: 5 March 2019

Fund Project: The authors thank HarwellXPS, the EPSRC National Facility for X-Ray Photoelectron Spectroscopy, for their assistance in performing XPS measurements, and EPSRC for support via the UK Catalysis Hub (EP/K014854/1, EP/K014714/1), and EPSRC and Diamond Light Source for funding the studentship to PH.

We present a comparison of Mo, V and Nb oxides as shell materials atop haematite cores used for selective methanol oxidation. While Mo and V both yield high selectivity to formaldehyde, Nb does not. Very different reactivity patterns are seen for Nb, which mainly shows dehydrogenation (to CO) and dehydration (to DME), indicating the lack of a complete shell, while Raman spectroscopy shows that the Mo and V formation process is not followed by NbO_x. We suggest this is due to the large differences in mobility within the solid materials during formation, NbO_x requiring significantly higher (and deleterious) calcination temperatures to allow sufficient mobility for shell completion.
- Methanol,
- Oxidation,
- Formaldehyde,
- Iron molybdate,
- Shell-core catalyst
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Methanol oxidation over shell-core MO_x/Fe₂O₃ (M=Mo, V, Nb) catalysts