Fluctuating Storage of the Active Phase in a Mn‐Na<sub>2</sub>WO<sub>4</sub>/SiO<sub>2</sub> Catalyst for the Oxidative Coupling of Methane
Maximilian J. Werny, Yuanqing Wang, Frank Girgsdies, Robert Schlögl, Annette Trunschke
Abstract
Abstract Structural dynamics of a Mn‐Na 2 WO 4 /SiO 2 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 Na 2 WO 4 with Mn 7 SiO 12 . The process is enabled by phase transitions and melting at the high reaction temperatures that are typically applied.
Topics & Concepts
CatalysisOxidative coupling of methaneMethaneRaman spectroscopyPhase (matter)ChemistryHeterogeneous catalysisInorganic chemistrySpectroscopyStoichiometryOxideMaterials scienceChemical engineeringPhotochemistryPhysical chemistryOrganic chemistryEngineeringQuantum mechanicsPhysicsOpticsCatalysis and Oxidation ReactionsCatalytic Processes in Materials ScienceTransition Metal Oxide Nanomaterials