High CO2 resistance of indium-doped cobalt-free 60 wt.%Ce0.9Pr0.1O2-δ-40 wt.%Pr0.6Sr0.4Fe1-xInxO3-δ oxygen transport membranes

• Published in: Ceramics international Vol. 48; no. 1; pp. 415 - 426
• Main Authors: Huang, Yanhao, Zhang, Chao, Wang, Xiaopeng, Li, Dongcheng, Zeng, Lingyong, He, Yiyi, Yu, Peifeng, Luo, Huixia
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2022
• Subjects: CO2 tolerance; Dual-phase membrane; Gas separation; Indium substitution; Oxygen transport membrane; Gas separation; CO2 tolerance; Indium substitution; Dual-phase membrane; Oxygen transport membrane
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2021.09.117

The oxygen transport membrane (OTM) has huge application prospects in gas separation and carbon neutralization based on oxygen enriched combustion. In this paper, the family 60 wt.%Ce0.9Pr0.1O2-δ-40 wt.%Pr0.6Sr0.4Fe1-xInxO3-δ (CPO-PSF1-xIxO, x = 0.01, 0.025, 0.05, 0.075, 0.1) cobalt-free dual-phase MIEC OTMs doped with indium have been successfully prepared by Pechini method. The phase structure, surface morphology, element distribution, oxygen permeability, and long-term operation stability of these OTMs are systematically explored. Among these OTMs, the champion oxygen permeable flux of CPO-PSF0.99I0.01O reaches 1.07 mL min−1·cm−2 and 0.80 mL min−1·cm−2 at 1000 °C under air/He gradient and air/CO2 gradient. Meanwhile, CPO-PSF0.99I0.01O maintains the value of 0.80 mL min−1·cm−2 steadily at 1000 °C for 100 h when pure CO2 as the sweep gas. The surface element distribution and phase structure of the OTMs after long-term oxygen permeability reaction are investigated by XRD, SEM combining with EDS, where the spent membranes retain the same structure and component as the fresh membranes, demonstrating that the In-doped OTMs have an excellent CO2 tolerance. Suitable indium substitution for iron of these OTMs not only improves the oxygen permeability, but also maintains the long-term reaction stability of the material. [Display omitted]