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

doi:10.1016/S1872-2067(19)63350-4

Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (11): 1686-1692.DOI: 10.1016/S1872-2067(19)63350-4

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

Pip Hellier^a,b, Peter P. Wells^c,d, Michael Bowker^a,b

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:2019-01-31 Revised:2019-03-05 Online:2019-11-18 Published:2019-09-06
Contact: Michael Bowker
Supported by:
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.

Abstract

Abstract: 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.

Key words: Methanol, Oxidation, Formaldehyde, Iron molybdate, Shell-core catalyst

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.

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

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