High efficiency CO2 sorption property of Li4SiO4 sorbent pebbles via a simple rolling ball method
High efficiency CO2 sorption property of Li4SiO4 sorbent pebbles via a simple rolling ball method
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DOI：
10.1016/j.seppur.2022.121662
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发表时间：
2022-10
影响因子：
8.6
通讯作者：
Guangfan Tan;Xinyi Hu;Chengyu Wang;Liang Cai;Shihao Song;Yanping Nong;Qinzheng Wang;Yanda Ren-Y
中科院分区：
文献类型：
--
作者：
Guangfan Tan;Xinyi Hu;Chengyu Wang;Liang Cai;Shihao Song;Yanping Nong;Qinzheng Wang;Yanda Ren-Y
目前，Li 4SiO 4吸收剂因其循环性能稳定、捕集能力强、再生温度低等优点，在CO2减排方面受到广泛关注。本文首次提出了一种简易的滚球法制备Li 4SiO 4吸附剂小球，克服了以往文献中采用的生产效率低、吸附稳定性差、生产成本高的缺点。在滚球法中，采用喷雾造粒法降低陶瓷粉体的比表面积，使粉体在PVA聚合物溶液的辅助下，通过离心力自团聚形成小球。研究了锂硅球的物相组成、比表面积、成型原理和微观结构。结果表明，在900 °C烧结2 h的Li 4SiO 4小球具有上级综合性能，其平均粒径为1.2 mm，球形度为0.95，破碎载荷为65 N，孔隙率为6.28%。与Li 4SiO 4粉体相比，球形卵石在100%CO2环境中具有上级CO2吸附能力（0.304 g CO2/g吸附剂）和优异的循环稳定性，这是由于其在高温下由粘结剂溶液产生的大量均匀孔道所致。因此，球磨法是未来批量生产稳定捕集CO2的Li 4SiO 4小球的一种潜在方法。
At present, the Li4SiO4sorbents have been getting widespread attention for mitigating the release of CO2gas owing to its stable cyclic property, higher capturing ability, and lower regeneration temperatures. In this work, a facile rolling ball method is first proposed to fabricate Li4SiO4sorbent pebbles, which overcomes the low production efficiency, poor adsorption stability, and high production cost adopted in the previous literature. In the rolling ball process, the spray granulation process was involved to decrease the specific surface area of ceramic powder, which makes it easier for powder self-agglomerate to form pebbles via the centrifugal force with the assistance of PVA polymer solution. Moreover, the phase composition, the specific surface area, the shaping principle, and the microstructure of Li4SiO4sorbent pebbles were studied, respectively. The result shows that the Li4SiO4pebbles sintered at 900 °C for 2 h present a superior comprehensive performance with a homogeneous diameter of 1.2 mm, good sphericity of 0.95, high crushing load of 65 N, and suitable porosity of 6.28 %. Compared with Li4SiO4powder, the spherical pebbles performed superior CO2adsorption ability (0.304 g CO2/g sorbent) and excellent cyclic stability in a 100% CO2environment owing to its large number of uniform pores channels produced by binder solution at high temperature. Therefore, the rolling ball process is a potential method for the batch production of Li4SiO4pebbles to capture CO2stably in the future.