Brookes, C;
Bowker, M;
Gibson, EK;
Gianolio, D;
Mohammed, KMH;
Parry, S;
Rogers, SM;
... Wells, PP; + view all
(2016)
In situ spectroscopic investigations of MoOx/Fe2O3 catalysts for the selective oxidation of methanol.
Catalysis Science & Technology
, 6
(3)
pp. 722-730.
10.1039/c5cy01175b.
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Abstract
Multicomponent oxide shell@core catalysts have been prepared, affording overlayers of MoOx on Fe2O3. This design approach allows bulk characterization techniques, such as X-ray Absorption Fine Structure (XAFS), to provide surface sensitive information. Coupling this approach with in situ methodologies provides insights during crucial catalytic processes. Calcination studies were followed by a combination of XAFS and Raman, and demonstrate that amorphous multi-layers of MoOx are first converted to MoO3 before formation of Fe2IJMoO4)3. However, a single overlayer of Oh Mo units remains at the surface at all times. In situ catalysis studies during formaldehyde production identified that Mo6+ was present throughout, confirming that gas phase oxygen transfer to molybdenum is rapid under reaction conditions. Reduction studies in the presence of MeOH resulted in the formation of reduced Mo–Mo clusters with a bonding distance of 2.6 Å. It is proposed that the presence of the clusters indicates that the selective conversion of MeOH to formaldehyde requires multiple Mo sites.
Type: | Article |
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Title: | In situ spectroscopic investigations of MoOx/Fe2O3 catalysts for the selective oxidation of methanol |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1039/c5cy01175b |
Publisher version: | http://dx.doi.org/10.1039/c5cy01175b |
Language: | English |
Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/1475794 |
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2. | Indonesia | 1 |
3. | Canada | 1 |
4. | Russian Federation | 1 |
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