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Identification and quantification of redox‐active centers at relevant conditions for catalysis is pivotal to understand reaction mechanisms and requires development of advanced operando methods. Herein, we demonstrate operando EPR spectroscopy as an important technique to quantify the oxidation state of representative CrPO4 and EuOCl catalysts during propane oxychlorination, an attractive route for propylene production. In particular, we show that the space‐time‐yield of C3H6 correlates with the amount of Cr2+ and Eu2+ ions generated over the catalysts during reaction. These results provide a powerful strategy to gather quantitative understanding of selective alkane oxidation, which could potentially be extrapolated to other functionalization approaches and operating conditions. [ABSTRACT FROM AUTHOR]

Innentitelbild: Quantification of Redox Sites during Catalytic Propane Oxychlorination by Operando EPR Spectroscopy (Angew. Keywords: alkane activation; heterogeneous catalysis; operando EPR spectroscopy; propane oxychlorination; reaction mechanism EN alkane activation heterogeneous catalysis operando EPR spectroscopy propane oxychlorination reaction mechanism 3354 3354 1 02/10/21 20210215 NES 210215 B Operando-EPR wird heiß b Im Forschungsartikel auf S. 3640 demonstrieren Guido Zichittella, Yevhen Polyhach, Javier Pérez-Ramírez et al. die Operando-EPR-Spektroskopie als zentrale Technik zur Bestimmung des Oxidationszustands von CrPO SB 4 sb - und EuOCl-Katalysatoren während der katalytischen Hochtemperatur-Oxychlorierung von Propan. Alkane activation, heterogeneous catalysis, operando EPR spectroscopy, propane oxychlorination, reaction mechanism. [Extracted from the article]