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44. SDC‐SCFZ dual‐phase ceramics: Structure, electrical conductivity, thermal expansion, and O2 permeability.

Author

Li, Claudia, Song, Jian, Zhang, Shude, Tan, Xiaoyao, Meng, Xiuxia, Sunarso, Jaka, and Liu, Shaomin

Subjects
THERMAL expansion, ELECTRIC conductivity, SOLID oxide fuel cells, PERMEABILITY, SOLID fuel reactors, KIRKENDALL effect
Abstract

New CO2‐resistant dual‐phase Sm0.2Ce0.8O1.925–SrCo0.4Fe0.55Zr0.05O3‐δ (SDC‐SCFZ) ceramics present a promising outlook for potential future applications in membrane reactors and solid oxide fuel cells. Their high oxygen permeation flux and stability in CO2 sweep gas also allow their integration in oxyfuel combustion. Here the structural characteristics, electrical conductivities, thermal expansion behaviors, and oxygen permeabilities of four different SDC‐SCFZ membranes with weight ratios of 10:90, 25:75, 50:50, and 75:25 (SDC:SCFZ) are systematically studied. Among these four SDC‐SCFZ compositions, 0.6 mm‐thick 25 wt% SDC‐75 wt% SCFZ displayed the highest oxygen permeation fluxes that reach 1.26 mL min−1 cm−2 at 950°C and retained its phase integrity under alternating He and CO2 sweep gas over 72 hours of operation. This composite also showed a moderate thermal expansion coefficient of 1.90 × 10−5 K−1 between 30°C and 1000°C and an electrical conductivity of at least 16 S cm−1 at 550°C and above. Modeling studies revealed that the oxygen permeation fluxes through 25SDC‐75SCFZ are limited by surface exchange reactions from 700°C to 800°C and mixed bulk diffusion and surface exchange reactions above 800°C. [ABSTRACT FROM AUTHOR]

Published
2021
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48. Enhanced CO selectivity for reverse water‐gas shift reaction using Ti4O7‐doped SrCe0.9Y0.1O3‐δ hollow fibre membrane reactor.

Author

Li, Ying, Zhuang, Shujuan, Wang, Tongtong, Meng, Xiuxia, Meng, Bo, Han, Ning, Liu, Shaomin, and Sunarso, Jaka

Subjects
CARBON monoxide, WATER gas shift reactions, MEMBRANE reactors
Abstract

Reverse water‐gas shift reaction (RWGS) is important in the CO2 utilization cycle to convert carbon dioxide (CO2) and hydrogen (H2) to carbon monoxide (CO). In this work, the RWGS performance is evaluated by utilizing Ti4O7‐doped SrCe0.9Y0.1O3‐δ (SCY‐b) hollow fibre membrane reactor where H2 permeates through the SCY‐b proton conducting membrane and reacts with CO2 feed gas. Upon increasing the temperature from 750 to 950 °C, the CO yield increased from a negligible value to 14.82 %, when the sweep gas flow rate was 50 mL min−1 H2‐He (50:50 vol. ratio) and the feed gas flow rate was 100 mL min−1 CO2‐N2 (5:95 vol. ratio). The CO yield increase with the temperature increase reflects the enhanced H2 permeation flux through the SCY‐b membrane at higher temperatures. Higher CO2 concentration in the feed gas led to lower CO yield due to the higher amount of remaining CO2 in the outlet stream. The deposition of porous SCY or SCY‐b surface layer onto the hollow fibre outer circumference surface also increased H2 flux through the fibre relative to the non‐deposited one. Thermogravimetric and CO2‐temperature programmed desorption results further reveal that SCY‐b adsorbed CO2 at temperature above 500 °C due to the reaction between CO2 and SCY‐b material. Despite the formation of SrCO3 during RWGS, the SCY‐b hollow fibre membrane reactor still displayed a stable CO yield of around 14 % throughout the 6‐day continuous membrane reactor test. [ABSTRACT FROM AUTHOR]

Published
2019
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