Fluctuating Storage of the Active Phase in a Mn‐Na2WO4/SiO2 Catalyst for the Oxidative Coupling of Methane |
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Authors: | Maximilian J Werny Yuanqing Wang Frank Girgsdies Robert Schlgl Annette Trunschke |
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Institution: | Maximilian J. Werny,Yuanqing Wang,Frank Girgsdies,Robert Schlögl,Annette Trunschke |
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Abstract: | Structural dynamics of a Mn‐Na2WO4/SiO2 catalyst were detected directly under reaction conditions during the oxidative coupling of methane via in situ XRD and operando Raman spectroscopy. A new concept of fluctuating storage and release of an active phase in heterogeneous catalysis is proposed that involves the transient generation of active sodium oxide species via a reversible reaction of Na2WO4 with Mn7SiO12. The process is enabled by phase transitions and melting at the high reaction temperatures that are typically applied. |
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Keywords: | catalysis C− H activation OCM operando analysis Raman spectroscopy |
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