Simultaneous operando Raman and FTIR spectroscopic measurements have been combined for the study of vanadium based catalysts during propane OxyDeHydrogenation (ODH).FTIR and Raman spectroscopies allow respectively the simultaneous characterization of the adsorbed species or reaction intermediates, and yield structural information of the catalyst, notably the dispersed surface vanadium oxide species and its interaction with the zirconia-based support. The combined use of these spectroscopies with the activity results measured with on line mass spectrometry is used to establish a reaction mechanism for propane ODH and to identify the role of different oxygen species bound to vanadium sites. The results illustrate a Mars-van Krevelen type mechanism. Besides, they also show the higher activity of bridging oxygen sites (V-O-V, V-O-Zr) than terminal V=O bonds. These results demonstrate the high potential of the new simultaneous IR-Raman operando rig to correlate the activity and the structure of catalysts; thus, assisting the rational design of catalytic processes.

Simultaneous operando FTIR & Raman study (IRRaman) for unraveling the propane ODH mechanism over V-based catalysts

2019 Fall National Meeting

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