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Methanol oxidation on Fe2O3 catalysts and the effects of surface Mo

Bowker, Michael, Gibson, E. K., Silverwood, I. P. and Brookes, Catherine 2016. Methanol oxidation on Fe2O3 catalysts and the effects of surface Mo. Faraday Discussions 188 , pp. 387-398. 10.1039/C5FD00225G

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Abstract

The adsorption of methanol on haematite has been investigated using temperature programmed methods, combined with in situ DRIFTS. Model catalysts based on this material have then been made with a shell–core configuration of molybdenum oxide monolayers on top of the haematite core. These are used as models of industrial iron molybdate catalysts, used to selectively oxidise methanol to formaldehyde, one of the major chemical outlets for methanol. Haematite itself is completely ineffective in this respect since it oxidises it to CO2 and the DRIFTS shows that this occurs by oxidation of methoxy to formate at around 200C. The decomposition behaviour is affected by the absence or presence of oxygen in the gas phase; oxygen destabilises the methoxy and enhances formate production. In contrast, when a monolayer of molybdena is placed onto the surface by incipient wetness, and it remains there after calcination, the pathway to formate production is blocked and formaldehyde is the main gas phase product in TPD after methanol dosing.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1359-6640
Funders: EPSRC
Date of First Compliant Deposit: 9 August 2016
Date of Acceptance: 22 December 2015
Last Modified: 04 Jun 2017 09:21
URI: http://orca-mwe.cf.ac.uk/id/eprint/93699

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