Reversible CO 2 Absorption by the 6H Perovskite Ba 4 Sb 2 O 9
Reversible CO 2 Absorption by the 6H Perovskite Ba 4 Sb 2 O 9
复制标题
6H钙钛矿Ba 4 Sb 2 O 9 的可逆CO 2 吸收
DOI：
10.1021/cm402875v
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发表时间：
2013
影响因子：
8.6
通讯作者：
Dunstan M
中科院分区：
文献类型：
--
作者：
Dunstan M
一种用于碳捕获和储存(CCS)的新型化合物，6H钙钛矿Ba4Sb2O9，被发现能够在873K通过化学反应吸收二氧化碳，生成碳酸钡和BaSb2O6。这种吸收是可逆的，通过原始的Ba4Sb2O9材料在1223K以上加热并伴随着CO2的释放而再生。采用同步辐射X射线衍射、热重分析和显微分析相结合的方法，首先表征了材料的物理吸收性能，然后分析了材料的结构演变和原位相的形成。重要的是，通过随后对材料进行100多次碳化和再生，结果表明，联合吸收和再生反应进行时，材料的二氧化碳吸收能力没有任何显著降低。经100次循环后，Ba4Sb2O9的容量为0.1g(∼)/g(吸附剂)，占总摩尔容量的73%。这是首次报道钙钛矿型材料具有如此良好的性能，为研究具有稳定和灵活的化学组成和结构的新型无机氧化物材料在碳捕获中的应用开辟了道路。
A novel compound for carbon capture and storage (CCS) applications, the 6H perovskite Ba4Sb2O9, was found to be able to absorb CO2through a chemical reaction at 873 K to form barium carbonate and BaSb2O6. This absorption was shown to be reversible through the regeneration of the original Ba4Sb2O9material upon heating above 1223 K accompanied by the release of CO2. A combined synchrotron X-ray diffraction, thermogravimetric, and microscopy study was carried out to characterize first the physical absorption properties and then to analyze the structural evolution and formation of phases in situ. Importantly, through subsequent carbonation and regeneration of the material over 100 times, it was shown that the combined absorption and regeneration reactions proceed without any significant reduction in the CO2absorption capacity of the material. After 100 cycles the capacity of Ba4Sb2O9was ∼0.1 g (CO2)/g (sorbent), representing 73% of the total molar capacity. This is the first report of a perovskite-type material showing such good properties, opening the way for studies of new classes of inorganic oxide materials with stable and flexible chemical compositions and structures for applications in carbon capture.