Publication
Article Metrics
Citations
Online attention
Investigation of moOx/Al2O3 under cyclic operation for oxidative and non-oxidative dehydrogenation of propane
Authors:
Santhosh K.
Matam
(UK Catalysis Hub, Research Complex at Harwell; Cardiff University)
,
Caitlin
Moffat
(University of Glasgow)
,
Pip
Hellier
(UK Catalysis Hub, Research Complex at Harwell; Cardiff University)
,
Michael
Bowker
(UK Catalysis Hub, Research Complex at Harwell; Cardiff University)
,
Ian P.
Silverwood
(UK Catalysis Hub, Research Complex at Harwell; ISIS Neutron and Muon Source)
,
C. Richard A.
Catlow
(UK Catalysis Hub, Research Complex at Harwell; Cardiff University; University College London)
,
S. David
Jackson
(University of Glasgow)
,
James
Craswell
(UK Catalysis Hub, Research Complex at Harwell; University of Southampton)
,
Peter P.
Wells
(UK Catalysis Hub, Research Complex at Harwell; University of Southampton; Diamond Light Source)
,
Stewart F.
Parker
(UK Catalysis Hub, Research Complex at Harwell; University of Glasgow; ISIS Neutron and Muon Source)
,
Emma K.
Gibson
(UK Catalysis Hub, Research Complex at Harwell; University of Glasgow)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Catalysts
, VOL 10
State:
Published (Approved)
Published:
November 2020
Diamond Proposal Number(s):
10306

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.
Journal Keywords: propane; dehydrogenation; molybdenum oxide; XANES; Raman spectroscopy; inelastic neutron scattering spectroscopy; infrared spectroscopy
Subject Areas:
Chemistry
Instruments:
B18-Core EXAFS
Added On:
28/11/2020 16:50
Documents:
catalysts-10-01370-v3.pdf
Discipline Tags:
Physical Chemistry
Catalysis
Chemistry
Organic Chemistry
Technical Tags:
Spectroscopy
X-ray Absorption Spectroscopy (XAS)
X-ray Absorption Near Edge Structure (XANES)