Sol-gel-derived perovskite-based sorbents for high-temperature air separation

摘要

In this work, partial substitution or doping of SrCo0.8Fe0.2O3- (SCF), which leads to the formation of La0.6Sr0.4Co0.2Fe0.8O3- (LSCF) and La0.6Sr0.4Co0.2Ni0.8O3- (LSCNi) were carried out using Pechini sol-gel technique. The perovskite oxides sol was then calcined at 850 degrees C for 4h and their crystallinity, morphology and oxygen sorption/desorption behaviour were systematically compared. It was found that the synthesised perovskite oxides exhibit single-phase cubic perovskites. The O-2-TPD analysis indicates that LSCNi adsorbed the largest amount of oxygen and SCF only performed better at higher operating temperature. From the fixed bed test, LSCF and LSCNi are found to have high potential to be used as O-2 sorbent for high-temperature air separation because they required shorter time to achieve the breakthrough curve.