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Perovskite Promoted Mixed Cobalt–Iron Oxides for Enhanced Chemical Looping Air Separation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-01 00:00:00 , DOI: 10.1021/acssuschemeng.8b03970 Jian Dou 1 , Emily Krzystowczyk 1 , Amit Mishra 1 , Xingbo Liu 2 , Fanxing Li 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-01 00:00:00 , DOI: 10.1021/acssuschemeng.8b03970 Jian Dou 1 , Emily Krzystowczyk 1 , Amit Mishra 1 , Xingbo Liu 2 , Fanxing Li 1
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Chemical looping air separation (CLAS) is a promising approach to produce high purity oxygen from air. Redox kinetics and oxygen carrying capacity of oxide-based oxygen carrier materials play a critical role in the overall performance of CLAS. In view of the fast lattice oxygen transport property of mixed-conductive perovskite materials, composites of La0.8Sr0.2CoxFe1–xO3 (LSCF) perovskite and mixed Co–Fe oxides (CF) were investigated for chemical looping air separation. The effects of Fe and perovskite addition were systematically examined by varying Co/Fe and LSCF/CF ratios. Increase of Fe in mixed Co–Fe oxides significantly increases oxidation kinetics of LSCF-CF composites while decreasing the rate of oxygen release. An optimized average redox rate was achieved by balancing the oxygen uptake (oxidation) and release (reduction) rates through tuning Co/Fe ratio, with the maximum occurring at a ratio of 9:1. Unpromoted Co–Fe mixed oxide exhibited a working oxygen capacity of 1.6 wt % at 850 °C. With the addition of 10–30 wt % LSCF, the oxygen capacity more than doubled to 4.1–4.2%. The enhanced oxygen storage/release is attributed to well dispersed Co–Fe mixed oxide within LSCF, which assists fast lattice oxygen diffusion to and from Co–Fe mixed oxide. The LSCF-CF composite exhibited satisfactory stability and activity over 50 redox cycles at 850 °C.
中文翻译：
钙钛矿促进混合钴-铁氧化物，以增强化学回路空气分离
化学回路空气分离（CLAS）是一种从空气中生产高纯度氧气的有前途的方法。氧化物基氧气载体材料的氧化还原动力学和氧气承载能力在CLAS的整体性能中起着至关重要的作用。考虑到混合导电钙钛矿材料的快速晶格氧传输性能，La 0.8 Sr 0.2 Co x Fe 1– x O 3的复合材料（LSCF）钙钛矿和混合的Co-Fe氧化物（CF）被用于化学回路空气分离。通过改变Co / Fe和LSCF / CF的比例，系统地检查了Fe和钙钛矿添加的影响。混合Co-Fe氧化物中Fe的增加显着增加了LSCF-CF复合材料的氧化动力学，同时降低了氧的释放速率。通过调整Co / Fe比例来平衡氧气的吸收（氧化）和释放（还原）速率，可以实现最佳的平均氧化还原速率，最大比例为9：1。未经促进的Co-Fe混合氧化物在850°C时的工作氧容量为1.6 wt％。加入10–30 wt％的LSCF，氧气容量增加了一倍以上，达到4.1–4.2％。氧气储存/释放的增强归因于LSCF中Co-Fe混合氧化物的分散性好，这有助于晶格氧快速扩散到钴铁混合氧化物中或从钴铁混合氧化物中扩散出来。LSCF-CF复合材料在850°C的50个氧化还原循环中表现出令人满意的稳定性和活性。
更新日期：2018-10-01
中文翻译：
钙钛矿促进混合钴-铁氧化物，以增强化学回路空气分离
化学回路空气分离（CLAS）是一种从空气中生产高纯度氧气的有前途的方法。氧化物基氧气载体材料的氧化还原动力学和氧气承载能力在CLAS的整体性能中起着至关重要的作用。考虑到混合导电钙钛矿材料的快速晶格氧传输性能，La 0.8 Sr 0.2 Co x Fe 1– x O 3的复合材料（LSCF）钙钛矿和混合的Co-Fe氧化物（CF）被用于化学回路空气分离。通过改变Co / Fe和LSCF / CF的比例，系统地检查了Fe和钙钛矿添加的影响。混合Co-Fe氧化物中Fe的增加显着增加了LSCF-CF复合材料的氧化动力学，同时降低了氧的释放速率。通过调整Co / Fe比例来平衡氧气的吸收（氧化）和释放（还原）速率，可以实现最佳的平均氧化还原速率，最大比例为9：1。未经促进的Co-Fe混合氧化物在850°C时的工作氧容量为1.6 wt％。加入10–30 wt％的LSCF，氧气容量增加了一倍以上，达到4.1–4.2％。氧气储存/释放的增强归因于LSCF中Co-Fe混合氧化物的分散性好，这有助于晶格氧快速扩散到钴铁混合氧化物中或从钴铁混合氧化物中扩散出来。LSCF-CF复合材料在850°C的50个氧化还原循环中表现出令人满意的稳定性和活性。
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