Oxygen Permeation And Oxidative Coupling Of Methane With Nife2o4-Gd0.1ce0.9o2-Delta Composite Membrane

Oxygen permeability and oxidative coupling of methane (OCM) characteristics of a 30 vol.% NiFe2O4-70 vol.% Gd0.1Ce0.9O2-delta (NFO-GDC) composite membrane were systematically investigated by varying operational conditions for oxygen permeation and OCM experiments. The NFO-GDC membrane showed the maximum oxygen permeation flux of 2.24 mL center dot cm(-2)center dot min(-1) under an Air/He gradient at 900 degrees C, and flux increased with increasing oxygen partial pressure gradient in the order He < CH4 < H-2. The maximum OCM yield and C2H4/C2H6 ratio were observed at 900 degrees C and for CH4 flowing at 12.5 mL center dot min(-1), respectively, and the yield and ratio both increased with increasing temperature in the range 700-900 degrees C. The overall coupling yield was notably enhanced by applying a Mn/Na2WO4/SiO2 catalyst to the permeate side of the composite membrane. The NFO-GDC membrane with the Mn/Na2WO4/SiO2 catalyst exhibited the maximum yield and a C2H4/C2H6 ratio of 8.6% and 3.21, respectively.