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Issue 126, 2015
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Atomic-scale cation dynamics in a monolayer VOX/α-Fe2O3 catalyst

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Abstract

Catalytic reactions are associated with dynamical changes in the catalyst that include the oxidation state and local structural variations. The understanding of such dynamics, particularly at the atomic-scale, is of great importance for revealing the activity and selectivity of the catalyst in numerous reactions. Combining in situ X-ray absorption spectroscopy with in situ diffuse reflectance infrared Fourier transform spectroscopy, we studied the redox-induced dynamical changes for a VOX monolayer catalyst supported on a α-Fe2O3 powder. The results show that several co-existing VOX species reversibly change their V oxidation states between +5 and +4, in concurrence with a structural change from two-dimensional chains to well connected V–O–V networks. These changes are also associated with the breaking and formation of the V[double bond, length as m-dash]O vanadyl group. This combined study provides new insight into how VOX species change during catalytic reactions, which leads to proposed atomic-scale models for the redox-induced dynamics of the catalyst.

Graphical abstract: Atomic-scale cation dynamics in a monolayer VOX/α-Fe2O3 catalyst

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Publication details

The article was received on 09 sep. 2015, accepted on 16 nóv. 2015 and first published on 18 nóv. 2015


Article type: Paper
DOI: 10.1039/C5RA18404E
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Citation: RSC Adv., 2015,5, 103834-103840

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    Atomic-scale cation dynamics in a monolayer VOX/α-Fe2O3 catalyst

    Z. Feng, Q. Ma, J. Lu, H. Feng, J. W. Elam, P. C. Stair and M. J. Bedzyk, RSC Adv., 2015, 5, 103834
    DOI: 10.1039/C5RA18404E

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