期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 54, 期 19, 页码 12467-12475出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c01702
关键词
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资金
- National Natural Science Foundation of China [51906041]
- Natural Science Foundation of Jiangsu Province [BK20190360]
- National Science Foundation for Distinguished Young Scholars of China [51525601]
- Scientific Research Foundation of Graduate School of Southeast University [YBPY2009]
The chemical looping process is promising for CO2 conversion because of the much higher CO2 conversion efficiency than the photocatalytic and electrocatalytic processes. Conventional oxygen carriers have to include a high content of inert support, typically Al2O3, to avoid sintering, thus leading to a trade-off between reactivity and stability. Here, we propose the use of ion-conductive GdxCe2-xO2-delta (GDC) to prepare the supported oxygen carriers. The resulting Fe2O3/GDC materials achieve both high reactivity and stability. Fe2O3/Gd0.3Ce1.7O2-delta shows high CO productivity (similar to 10.79 mmol.g(-1)) and CO production rate (similar to 0.77 mmol.g(-1).min(-1)), which are twofold higher than that of Fe2O3/Al2O3. The performance remains stable even after 30 cycles. The mechanism study confirmed the rate-limiting role of the oxygen-ion conductivity, and the GDC support enhanced the oxygen-ion conductivity of oxygen carriers during the redox reactions, thus leading to improved CO2 splitting performance. A roughly linear relationship between the oxygen-ion conductivity and CO2 yield is also obtained and verified in our testing conditions. This relation can be used to predict and select oxygen carriers with high CO2Y splitting performance.
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