Preparation of Tubular Dense Perovskite Type Membranes and their Application for Oxygen Separation

摘要

Tubular dense perovskite type membranes were prepared by isostatic pressing and plastic extrausion. The resulting tubular La_0.6Sr_0.4Co_0.2Fe_0.8O_3- delta type membrane prepared by plastic extrusion (designated as PE-LSCF) has lower density and oxygen permeation fux as compared with that prepared by isostatic pressing (designated as IP-LSCF). A ceramic binder developed by our research center provided reliable sealing for the tubular dense membrane at high temperature. The oxygen permeation flux increases with increasing temperature and the value is about 0.13 cm~3/cm~2 min (STP) at 1123 K. The activation energy for oxygen permeation is 168 kJ/mol at the temperature range of 1073-1173 K.