Title
Electric Field and Mobile Oxygen Promote Low-Temperature Oxidative Coupling of Methane over La1–xCaxAlO3−δ Perovskite Catalysts
Author
Ayaka Sato, Shuhei Ogo, Yuna Takeno, Kent Takise, Jeong Gil Seo, Yasushi Sekine
Year
2019
Journal
ACS Omega
Abstract
Oxidative coupling of methane (OCM) over La1–xMxAlO3−δ (M = Ca, Sr, Ba; x = 0, 0.1, 0.2, 0.3) in an electric field at low temperature (423 K) was investigated. Among the tested catalysts, the La0.7Ca0.3AlO3−δ catalyst showed the highest performance in terms of C2H6 + C2H4 yield (11.1%). Surface mobile oxygen species (O22– or O–), which were considered as active oxygen species for the OCM reaction, increased with increasing Ca doping amount, and thereby the La0.7Ca0.3AlO3−δ catalyst showed the best catalytic activity.
Instrument
NRS-4500
Keywords
Raman Imaging Spectroscopy, Electric field, perovskite