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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 Schlögl Annette Trunschke |
| Institution: | 1. Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany;2. Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
BasCat—UniCat BASF Joint Lab, Technische Universität Berlin, Germany |
| 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. |
| Keywords: | catalysis C−H activation OCM operando analysis Raman spectroscopy |