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

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

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 NbOx. We suggest this is due to the large differences in mobility within the solid materials during formation, NbOx requiring significantly higher (and deleterious) calcination temperatures to allow sufficient mobility for shell completion.

Formaldehyde, Iron molybdate, Methanol, Oxidation, Shell-core catalyst
1872-2067
1686-1692
Hellier, Pip
c3bd090a-2f8d-45ec-8ee6-781c034eb9b9
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Bowker, Michael
c9ab10a5-d144-4533-bf6d-2fa16b669565
Hellier, Pip
c3bd090a-2f8d-45ec-8ee6-781c034eb9b9
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Bowker, Michael
c9ab10a5-d144-4533-bf6d-2fa16b669565

Hellier, Pip, Wells, Peter P. and Bowker, Michael (2019) Methanol oxidation over shell-core MOx/Fe2O3 (M = Mo, V, Nb) catalysts. Chinese Journal of Catalysis, 40 (11), 1686-1692. (doi:10.1016/S1872-2067(19)63350-4).

Record type: Article

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 NbOx. We suggest this is due to the large differences in mobility within the solid materials during formation, NbOx requiring significantly higher (and deleterious) calcination temperatures to allow sufficient mobility for shell completion.

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More information

Accepted/In Press date: 5 March 2019
e-pub ahead of print date: 5 November 2019
Published date: November 2019
Keywords: Formaldehyde, Iron molybdate, Methanol, Oxidation, Shell-core catalyst

Identifiers

Local EPrints ID: 437498
URI: http://eprints.soton.ac.uk/id/eprint/437498
ISSN: 1872-2067
PURE UUID: 25873796-e2af-431b-bbb6-cdf0944240b1
ORCID for Peter P. Wells: ORCID iD orcid.org/0000-0002-0859-9172

Catalogue record

Date deposited: 31 Jan 2020 17:36
Last modified: 18 Feb 2021 17:05

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Contributors

Author: Pip Hellier
Author: Peter P. Wells ORCID iD
Author: Michael Bowker

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