Hydrogen permeation performance of dual-phase protonic-electronic conducting ceramic membrane with regular and independent transport channels

• Published in: Separation and purification technology 2019-04, Vol.213 (C), p.515-523
• Main Authors: Meng, Bo, Wang, Huina, Cheng, Hongda, Wang, Xiaobin, Meng, Xiuxia, Sunarso, Jaka, Tan, Xiaoyao, Liu, Shaomin
• Format: Article
• Language: English
• Subjects: Dual-phase laminated membrane; Hydrogen permeation; Proton conductor; SDC; SrCe0.9Y0.1O3
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2018.12.068

[Display omitted] •Dual-phase SCY-SDC laminated membrane was prepared and characterized.•Laminated membrane shows a maximum H2 flux of 0.163 mL min−1 cm−2 at 900 °C.•This flux was higher than that for the conventional SCY-SDC dual-phase membrane.•Such discrepancy was due to shorter transport paths and less phase interfaces. This work characterizes the hydrogen permeation fluxes of dual-phase SrCe0.9Y0.1O3-Ce0.8Sm0.2O2 (SCY-SDC) laminated membrane that contains regular and independent transport channels made of alternating films of SCY and SDC phases. Such membrane was synthesized via combined tape casting, co-pressing, and sintering route. The hydrogen flux of the dual-phase SCY-SDC laminated membrane reached 0.163 mL min−1 cm−2 at 900 °C when 100 mL min−1 of 20 vol% H2 in He and 100 mL min−1 of N2 were passed in the feed side and the permeate side, respectively. Such flux is significantly larger than the flux of the conventional SCY-SDC dual-phase membrane made by mixing SCY-SDC powder mixture and subsequent sintering at the same operation condition. The enhanced flux for the dual-phase laminated membrane relative to the conventional dual-phase membrane is attributed to the shorter diffusion paths for protons and electrons and the lower amount of the phase interfaces. The dual-phase SCY-SDC laminated membrane also displayed stable hydrogen permeation flux of around 0.15 mL min−1 cm−2 during 166-hour continuous operation at 850 °C in the presence of carbon dioxide in the permeate gas stream. Such stable performance highlights its chemical stability. Another attractive advantage of the dual-phase SCY-SDC laminated membrane lies in the minor discrepancy of the thermal expansion coefficient of SCY (α = 1.12·10−5 K−1) to that of SDC (α = 1.28·10−5 K−1) as obtained by dilatometry from room temperature to 1500 °C, which ensures its mechanical integrity during repeated thermal cycles.