Oxygen Permeation and Stability of Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ) Membrane According to Trace Elements and Oxygen Partial Pressure in Synthetic Air

摘要

A dense membrane of perovskite Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ) has been successfully prepared by polymerized complex method. Oxygen permeation according to carbon dioxide concentrations was measured in the oxygen partial pressure range of 2.1 x 10~(-3) ~0.63 atm and phase stability of membrane were examined using SEM-EDS. The oxygen flux increased with increasing temperature and pressure difference and the maximum oxygen permeation flux through 1.0 mm membrane was ca. 3.7 ml/cm~2·min at 950 °C. The oxygen permeation in the condition of air and CO_2 (300~700 ppm) in feed stream decreased more than 43% in comparison with air feed stream.