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Fluctuating Storage of the Active Phase in a Mn‐Na 2 WO 4 /SiO 2 Catalyst for the Oxidative Coupling of Methane
Author(s) -
Werny Maximilian J.,
Wang Yuanqing,
Girgsdies Frank,
Schlögl Robert,
Trunschke Annette
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202004778
Subject(s) - catalysis , oxidative coupling of methane , methane , raman spectroscopy , phase (matter) , chemistry , heterogeneous catalysis , inorganic chemistry , spectroscopy , stoichiometry , oxide , materials science , chemical engineering , photochemistry , organic chemistry , physics , optics , engineering , quantum mechanics
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.