Abstract
We combine Raman spectroscopy, EPR, XPS, temperature programmed reduction, XRD, 51V MAS ssNMR, TEM and N2-physisorption to unravel structure–activity relationships during the non-oxidative dehydrogenation of isobutane over a V based catalyst.
Highlights
The development of direct routes for the production of light olefins has gained interest over the last few decades
Operation conditions were optimized in terms of temperature, WHSV and conversion to maximize the isobutylene yield at selectivities higher than 80%
In this work we analysed the physicochemical state of vanadium prior to and after the non-oxidative dehydrogenation of isobutane, highlighting the formation of both V4+ and V3+ species at the expense of V5+ along the reaction
Summary
The development of direct routes for the production of light olefins has gained interest over the last few decades. The main on-purpose route is the catalytic dehydrogenation of light alkanes, with platinum and chromium supported catalysts being the preferred option for industrial processes such as Catofin and Oleflex.[1] In the search for catalysts based on abundant and low toxicity elements, vanadium has been identified as a suitable alternative to Pt and Cr. It has been seen that both structural and chemical states of vanadium determine its catalytic performance. Isolated oxovanadium species are prone to reduction under reaction conditions, resulting in the formation of V–O–H acidic sites which promote the formation of aromatics and coke.[31,37]
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