A simultaneous operando FTIR & Raman study of propane ODH mechanism over V-Zr-O catalysts

• Published in: Catalysis today Vol. 387; pp. 197 - 206
• Main Authors: Ternero-Hidalgo, J.J., Daturi, M., Clet, G., Bazin, P., Bañares, M.A., Portela, R., Guerrero-Pérez, M.O., Rodríguez-Mirasol, J., Cordero, T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2022; Elsevier
• Subjects: Active sites; Analytical chemistry; Catalysis; Chemical Sciences; operando IR-Raman; Propane ODH; Reaction mechanism; Structure-activity relationships; Reaction mechanism; operando IR-Raman; Propane ODH; Active sites; Structure-activity relationships
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2021.06.012

Simultaneous operando Raman and transmission FTIR spectroscopic measurements have been combined for the study of the structure-activity relationships of V-Zr-O catalysts during propane oxidative dehydrogenation (ODH). The combination of both spectroscopies during reaction allows the identification of reaction intermediates and yields structural information about the catalyst. The experimental results are compared with available data in the literature to propose a reaction mechanism for propane ODH on V-Zr-O catalytic systems, and to identify the role of different oxygen species bound to vanadium sites. The results are consistent with a Mars-van Krevelen mechanism. Besides, they clearly show higher activity of bridging oxygen sites (V-O-V, V-O-Zr) than terminal VO bonds. [Display omitted] •Structure-activity investigations of a V-Zr-O catalyst during propane ODH reaction.•Unprecedented use of a multimodal operando IR-Raman device.•Description of relevant intermediates, providing novelties on the reaction mechanism.