Synthesis and Characterization of 40 wt % Ce<sub>0.9</sub>Pr<sub>0.1</sub>O<sub>2–<i>δ</i></sub>–60 wt % Nd<sub><i>x</i></sub>Sr<sub>1−<i>x</i></sub>Fe<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>3−<i>δ</i></sub> Dual-Phase Membranes for Efficient Oxygen Separation

oleh: Guoxing Chen, Zhijun Zhao, Marc Widenmeyer, Ruijuan Yan, Ling Wang, Armin Feldhoff, Anke Weidenkaff

Format: Article
Diterbitkan: MDPI AG 2020-08-01

Deskripsi

Dense, H<sub>2</sub>- and CO<sub>2</sub>-resistant, oxygen-permeable 40 wt % Ce<sub>0.9</sub>Pr<sub>0.1</sub>O<sub>2–</sub><i><sub>δ</sub></i>–60 wt % Nd<i><sub>x</sub></i>Sr<sub>1−<i>x</i></sub>Fe<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>3−</sub><i><sub>δ</sub></i>dual-phase membranes were prepared in a one-pot process. These Nd-containing dual-phase membranes have up to 60% lower material costs than many classically used dual-phase materials. The Ce<sub>0.9</sub>Pr<sub>0.1</sub>O<sub>2−</sub><i><sub>δ</sub></i>–Nd<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>3−</sub><i><sub>δ</sub></i> sample demonstrates outstanding activity and a regenerative ability in the presence of different atmospheres, especially in a reducing atmosphere and pure CO<sub>2</sub> atmosphere in comparison with all investigated samples. The oxygen permeation fluxes across a Ce<sub>0.9</sub>Pr<sub>0.1</sub>O<sub>2−</sub><i><sub>δ</sub></i>–Nd<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>3−</sub><i><sub>δ</sub></i> membrane reached up to 1.02 mL min<sup>−1</sup> cm<sup>−2</sup> and 0.63 mL min<sup>−1</sup> cm<sup>−2</sup> under an air/He and air/CO<sub>2</sub> gradient at <i>T</i> = 1223 K, respectively. In addition, a Ce<sub>0.9</sub>Pr<sub>0.1</sub>O<sub>2–</sub><i><sub>δ</sub></i>–Nd<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>3–</sub><i><sub>δ</sub></i> membrane (0.65 mm thickness) shows excellent long-term self-healing stability for 125 h. The repeated membrane fabrication delivered oxygen permeation fluxes had a deviation of less than 5%. These results indicate that this highly renewable dual-phase membrane is a potential candidate for long lifetime, high temperature gas separation applications and coupled reaction–separation processes.