Abstract
Burning fossil fuels with O 2/CO 2 mixture produces a concentrated CO 2 stream and thus enables efficient CO 2 capture. In an attempt to improve the economic competiveness of this oxy-fuel combustion technology, intensive efforts have been made to develop ceramic oxygen separation membranes that have a potential to reduce the oxygen production costs over the present cryogenic air separation process. In this paper it is proposed that the O 2/CO 2 mixture could be supplied by using CO 2 as sweeping gas to remove the oxygen separated from air by an oxygen selective membrane. State-of-the-art membranes with the perovskite structure, such as SrCo 0.8Fe 0.2O 3− δ (SCF), suffer degradation upon exposure to the acidic gas CO 2. This paper reports that the stability of SCF in CO 2 can be improved remarkably by reducing its surface basicity through the introduction of Ti ions, while the oxygen permeability is largely retained. The membrane-based O 2/CO 2 production concept is also verified with a CO 2-tolerant membrane tube.
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