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Optimization of the structural characteristics of CaO and its effective stabilization yield high-capacity CO2 sorbents.
Nature Communications ( IF 14.7 ) Pub Date : 2018-06-19 , DOI: 10.1038/s41467-018-04794-5
Muhammad Awais Naeem , Andac Armutlulu , Qasim Imtiaz , Felix Donat , Robin Schäublin , Agnieszka Kierzkowska , Christoph R. Müller

Calcium looping, a CO2 capture technique, may offer a mid-term if not near-term solution to mitigate climate change, triggered by the yet increasing anthropogenic CO2 emissions. A key requirement for the economic operation of calcium looping is the availability of highly effective CaO-based CO2 sorbents. Here we report a facile synthesis route that yields hollow, MgO-stabilized, CaO microspheres featuring highly porous multishelled morphologies. As a thermal stabilizer, MgO minimized the sintering-induced decay of the sorbents' CO2 capacity and ensured a stable CO2 uptake over multiple operation cycles. Detailed electron microscopy-based analyses confirm a compositional homogeneity which is identified, together with the characteristics of its porous structure, as an essential feature to yield a high-performance sorbent. After 30 cycles of repeated CO2 capture and sorbent regeneration, the best performing material requires as little as 11 wt.% MgO for structural stabilization and exceeds the CO2 uptake of the limestone-derived reference material by ~500%.

中文翻译:

通过优化CaO的结构特性及其有效的稳定性,可以生产出高容量的CO2吸附剂。

钙循环(一种CO 2捕获技术)可能会提供一种人为的(即使不是短期的)解决方案来缓解气候变化,这是由人为的CO 2排放量仍在增加所触发的。钙循环经济运行的关键要求是要获得高效的基于CaO的CO 2吸附剂。在这里,我们报告了一种容易的合成路线,该路线可产生具有高度多孔的多壳形态的MgO稳定的空心CaO微球。作为热稳定剂,MgO最小化了烧结引起的吸附剂CO 2容量的衰减,并确保了稳定的CO 2吸收多个操作周期。基于电子显微镜的详细分析证实了组成的均一性,以及其多孔结构的特征,这些均一性被确定为生产高性能吸附剂的基本特征。经过30个重复的CO 2捕获和吸附剂再生循环后,性能最佳的材料需要低至11 wt。%的MgO来稳定结构,并且比石灰石衍生的参考材料的CO 2吸收量高出〜500%。
更新日期:2018-06-19
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