Effect of CO2 and SO2 on oxygen permeation and microstructure of (Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ membranes

A new CO2-resistant Ruddlesden–Popper oxide with superior oxygen transport: A-site deficient (Pr0.9La0.1)1.9(Ni0.74Cu0.21Ga0.05)O4+δ

“…33 The average thermal expansion coefficient of (PL) 1.9 NCG under a CO 2 atmosphere is 15.9 Â 10 À6 K À1 , which is slightly higher than the value of 15.1 Â 10 À6 K À1 observed for (PL) 2.0 NCG under the same conditions. 30 Note further that the oxygen content of A-site decient (PL) 1.9 NCG, at 900 C in air, is signicantly less than that observed for A-site stoichiometric (PL) 2.0 NCG. The latter suggests that A-site de-ciency is mainly compensated by the removal of oxygen from the lattice.…”

“…The results are consistent with those from our previous study, in which it was found that (PL) 2.0 NCG also possesses excellent chemical stability under CO 2 atmospheres. 29,30 SEM micrographs of the (PL) 1.9 NCG and (PL) 2.0 NCG membranes, which were sintered at 1230 C for 10 h in air, are presented in Fig. 4.…”

Probing CO2 reaction mechanisms and effects on the SrNb0.1Co0.9−xFexO3−δ cathodes for solid oxide fuel cells

“…Thermodynamically, Ellingham diagram (and the respective CO 2 chemical potential) can be used to evaluate the stability of carbonates for different metals (such as Ba, Sr, Ca and La) at a certain CO 2 partial pressure and temperature [8,18]. This diagram suggests that BaCO 3 is more readily formed than SrCO 3 and CaCO 3 .…”

Membrane-integrated oxy-fuel combustion of coal: Process design and simulation

“…For example, the oxygen flux of SCF membranes decreases to almost zero after exposing the permeate side to a pure CO 2 sweep gas stream for 70 h at 950 1C [23]. Alternatively, there are some membranes which are very stable in CO 2 atmosphere, such as dual phase membranes and K 2 NiF 4 -type membranes [29,30,41,42]. The oxygen fluxes of these membranes, however, are much lower, as compared with BSCF and SCF.…”

“…A lot of research is performed to explore suitable membrane materials for air separation for this application [27][28][29][30][31][32][33]. However, little work has been done on the overall evaluation of a membrane-integrated oxy-fuel combustion process [34,35], such as membrane area and energy balance estimations or to show whether the currently developed membranes are sufficient for, or far from, industrial application.…”