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Oxidative coupling of methane (OCM) over La 1- x  M  x  AlO 3-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 La 0.7 Ca 0.3 AlO 3-δ catalyst showed the highest performance in terms of C 2 H 6 + C 2 H 4 yield (11.1%). Surface mobile oxygen species (O 2  2- or O - ), which were considered as active oxygen species for the OCM reaction, increased with increasing Ca doping amount, and thereby the La 0.7 Ca 0.3 AlO 3-δ catalyst showed the best catalytic activity.

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Electric Field and Mobile Oxygen Promote Low-Temperature Oxidative Coupling of Methane over La1–xCaxAlO3−δ Perovskite Catalysts