Abstract
The paper reports on effect of doping Ag+, Ni2+, Ca2+, Ba2+ or Zr4+ in La0.1Sr0.9Co0.9Fe0.1O3−δ (LSCF1991) on its oxygen sorption capacity and desorption rate. The dopant can be incorporated into LSCF1991 matrix causing lattice expansion. The oxygen sorption capacity and tendency for the disordered perovskite to ordered brownmillerite phase transition for these samples decrease in the order: LSCF1991 > LSCF-Ag > LSCF-Ni > LSCF-Ca > LSCF-Ba > LSCF-Zr. The oxygen desorption rate also decreases in the same order for the doped samples. Doping increases the tendency of the disorder to order phase transition and enhances oxygen desorption rate during oxygen desorption step. Doping Ag and Ni provides more pronounced enhancement in oxygen desorption rate. The results suggest that Ag and Ni doped LSCF1991 samples are promising sorbents for use in a high temperature sorption process for air separation.
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