Non-oxidative dehydrogenation of isobutane over supported vanadium oxide: Nature of the active sites and coke formation

Alberto Rodriguez-Gomez, Abhishek Dutta Chowdhury, Mustafa Caglayan, Jeremy Bau, Edy Abou-Hamad, Jorge Gascon

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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.
Original languageEnglish (US)
Pages (from-to)6139-6151
Number of pages13
JournalCatalysis Science and Technology
Issue number18
StatePublished - Jul 1 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-11-10
Acknowledgements: This work is funded by King Abdullah University of Science and Technology (KAUST). We also thank Sandra Ramirez Cherbuy for TOC art.


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