Non-oxidative dehydrogenation of isobutane over supported vanadium oxide: Nature of the active sites and coke formation
Type
ArticleAuthors
Rodriguez-Gomez, Alberto
Chowdhury, Abhishek Dutta

Caglayan, Mustafa
Bau, Jeremy

Abou-Hamad, Edy

Gascon, Jorge

KAUST Department
Chemical Engineering ProgramImaging and Characterization Core Lab
KAUST Catalysis Center (KCC)
NMR
Physical Science and Engineering (PSE) Division
Date
2020Submitted Date
2020-06-10Permanent link to this record
http://hdl.handle.net/10754/665864
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We combine Raman spectroscopy, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), X-ray diffraction (XRD), high-field 51V-solid-state magic angle spinning NMR spectroscopy (ssNMR), transmission electron microscopy (TEM) and N2-physisorption to unravel structure-activity relationships during the non-oxidative dehydrogenation of isobutane over a V-based catalyst. The use of SBA-15 as a support favours the formation of oligomeric tetrahedral VOx species along with a smaller amount of V2O5 clusters. EPR, 51V-ssNMR and XPS suggest the formation of mostly V4+ species under reaction conditions. Investigation of "coke"species by dynamic nuclear polarization surface enhanced solid-state NMR (DNP SENS) reveals the co-existence of aliphatic, olefinic/aromatic, acetal/alkoxy and carbonyl-based organic moieties in the post-reacted catalyst. Together with TPR and XRD results, we postulate that oxygenated coke species are the main components responsible for vanadium clustering, which results in the irreversible deactivation of the catalyst.Citation
Rodriguez-Gomez, A., Chowdhury, A. D., Caglayan, M., Bau, J. A., Abou-Hamad, E., & Gascon, J. (2020). Non-oxidative dehydrogenation of isobutane over supported vanadium oxide: nature of the active sites and coke formation. Catalysis Science & Technology, 10(18), 6139–6151. doi:10.1039/d0cy01174fSponsors
This work is funded by King Abdullah University of Science and Technology (KAUST). We also thank Sandra Ramirez Cherbuy for TOC art.Publisher
Royal Society of Chemistry (RSC)Journal
Catalysis Science & TechnologyAdditional Links
http://xlink.rsc.org/?DOI=D0CY01174Fae974a485f413a2113503eed53cd6c53
10.1039/d0cy01174f
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