| The effect of A-doping elements on the CO2 tolerance of the membrane in perovskite materials was systematically studied.CO2 is an important component in pure oxygen combustion technology.In this part,La0.6X0.4FeO3-?(X = magnesium,calcium,strontium or barium)perovskite material and La0.6Sr0.4Co0.2Fe0.8O3-?(LSCF)perovskite ceramic hollow fiber were studied.The membrane was resistant to CO2 and it was found that the CO2 tolerance increased in the order of barium,strontium,calcium or magnesium,but the oxygen permeability was reduced.The effect of nitrogen oxides on the oxygen permeability of La0.6Sr0.4Co0.2Fe0.8O3-?(LSCF)perovskite film was investigated.It was found that when the film was exposed to NO at 900 ?,NO formed porous particles on the surface of the film,and the oxygen permeability of the LSCF film decreased sharply from 0.7 mLˇmin-1cm-2 to 0.1 mLˇmin-1cm-2,which was 85%lower than the fresh film.When the temperature rose to 1000 ?,NO decomposed into nitrogen and oxygen,and the negative effect on oxygen permeation disappeared.The oxygen permeability of the membrane rose to 1.08 mLˇmin-1cm-2.According to the above study,we have a deep understanding of the oxygen permeability in NO for the perovskite film.And it also provides some help to avoid the adverse effects of NO. |
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