Diamond Publications - Search Results

Search Again...

These results include publications that have not yet been reviewed and processed by Diamond Light Source. To view only processed publications click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

One item found (0 items not approved).

Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Investigation of moOx/Al2O3 under cyclic operation for oxidative and non-oxidative dehydrogenation of propane Santhosh K. Matam , Caitlin Moffat , Pip Hellier , Michael Bowker , Ian P. Silverwood , C. Richard A. Catlow , S. David Jackson , James Craswell , Peter P. Wells , Stewart F. Parker , Emma K. Gibson Catalysts 10 DOI: 10.3390/catal10121370 Diamond Proposal Number(s): [10306] Open Access Show Abstract ▼ Abstract: 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.	Nov 2020

Instruments / Technical Area

Publication Details

Published

Actions

B18-Core EXAFS

Investigation of moOx/Al2O3 under cyclic operation for oxidative and non-oxidative dehydrogenation of propane