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Article

Investigation of MoOx/Al2O3 under Cyclic Operation for Oxidative and Non-Oxidative Dehydrogenation of Propane

1
UK Catalysis Hub, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell OX11 0FA, UK
2
Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Park Place, Cardiff CF10 1AT, UK
3
School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK
4
ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Oxon OX11 0QX, UK
5
Department of Chemistry, University College London, 20 Gordon St, London WC1 HOAJ, UK
6
School of Chemistry, University of Southampton, University Road, Southampton SO17 1BJ, UK
7
Diamond Light Source, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0DE, UK
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(12), 1370; https://doi.org/10.3390/catal10121370
Received: 28 October 2020 / Revised: 20 November 2020 / Accepted: 22 November 2020 / Published: 24 November 2020
(This article belongs to the Special Issue Characterization Analysis of Heterogeneous Catalysts)
A MoOx/Al2O3 catalyst was synthesised and tested for oxidative (ODP) and non-oxidative (DP) dehydrogenation of propane in a reaction cycle of ODP followed by DP and a second ODP run. Characterisation results show that the fresh catalyst contains highly dispersed Mo oxide species in the +6 oxidation state with tetrahedral coordination as [MoVIO4]2− moieties. In situ X-ray Absorption Spectroscopy (XAS) shows that [MoVIO4]2− is present during the first ODP run of the reaction cycle and is reduced to MoIVO2 in the following DP run. The reduced species are partly re-oxidised in the subsequent second ODP run of the reaction cycle. The partly re-oxidised species exhibit oxidation and coordination states that are lower than 6 but higher than 4 and are referred to as MoxOy. These species significantly improved propene formation (relatively 27% higher) in the second ODP run at similar propane conversion activity. Accordingly, the initial tetrahedral [MoVIO4]2− present during the first ODP run of the reaction cycle is active for propane conversion; however, it is unselective for propene. The reduced MoIVO2 species are relatively less active and selective for DP. It is suggested that the MoxOy species generated by the reaction cycle are active and selective for ODP. The vibrational spectroscopic data indicate that the retained surface species are amorphous carbon deposits with a higher proportion of aromatic/olefinic like species. View Full-Text
Keywords: propane; dehydrogenation; molybdenum oxide; XANES; Raman spectroscopy; inelastic neutron scattering spectroscopy; infrared spectroscopy propane; dehydrogenation; molybdenum oxide; XANES; Raman spectroscopy; inelastic neutron scattering spectroscopy; infrared spectroscopy
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MDPI and ACS Style

Matam, S.K.; Moffat, C.; Hellier, P.; Bowker, M.; Silverwood, I.P.; Catlow, C.R.A.; Jackson, S.D.; Craswell, J.; Wells, P.P.; Parker, S.F.; Gibson, E.K. Investigation of MoOx/Al2O3 under Cyclic Operation for Oxidative and Non-Oxidative Dehydrogenation of Propane. Catalysts 2020, 10, 1370. https://doi.org/10.3390/catal10121370

AMA Style

Matam SK, Moffat C, Hellier P, Bowker M, Silverwood IP, Catlow CRA, Jackson SD, Craswell J, Wells PP, Parker SF, Gibson EK. Investigation of MoOx/Al2O3 under Cyclic Operation for Oxidative and Non-Oxidative Dehydrogenation of Propane. Catalysts. 2020; 10(12):1370. https://doi.org/10.3390/catal10121370

Chicago/Turabian Style

Matam, Santhosh K., Caitlin Moffat, Pip Hellier, Michael Bowker, Ian P. Silverwood, C. R.A. Catlow, S. D. Jackson, James Craswell, Peter P. Wells, Stewart F. Parker, and Emma K. Gibson 2020. "Investigation of MoOx/Al2O3 under Cyclic Operation for Oxidative and Non-Oxidative Dehydrogenation of Propane" Catalysts 10, no. 12: 1370. https://doi.org/10.3390/catal10121370

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