Nityashree N, Manohara G V, Maroto-Valer M Mercedes, Garcia S
Research Centre for Carbon Solutions (RCCS), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom.
ACS Appl Mater Interfaces. 2020 Jul 29;12(30):33765-33774. doi: 10.1021/acsami.0c08652. Epub 2020 Jul 16.
Developing novel sorbents with maximum carbonation efficiency and good cycling stability for CO capture is a promising route to sequester anthropogenic CO. In this work, we have employed a green synthesis method to synthesize CaO-based sorbents suitably stabilized by MgO and supported by generated carbon under inert atmosphere. The varied amounts (10-30 wt %) of MgO were used to stabilize the CaO. The supported mixed metal oxide (MMO) sorbents were screened for high-temperature CO capture under CO rich (86% CO) and lean (14% CO) gas streams at 650 °C and atmospheric pressure. The MMO sorbents captured 53-63 wt % of CO per gram of sorbent under 86 and 14% CO, accounting for about 98% carbonation efficiency, which outperforms the CO capture capacity of limestone derived CaO (L-CaO) sorbents (22.8 wt %). All of the synthetic MMO sorbents showed greater capture capacity and cyclic stability when compared to benchmark L-CaO. Because of the high carbonation efficiency and cycling stability of g-CaMgO sorbent, it was tested for 100 carbonation/regeneration cycles of 5 min each under CO lean conditions. The g-CaMgO sorbent showed exceptional CO capture capacity and cycling stability and retained about 65% of its initial capture capacity after 100 cycles.
开发具有最大碳酸化效率和良好循环稳定性的新型吸附剂用于捕获CO₂是一种有前景的隔离人为排放CO₂的途径。在这项工作中，我们采用了一种绿色合成方法来合成在惰性气氛下由MgO适当稳定并由生成的碳负载的CaO基吸附剂。使用不同量（10 - 30 wt%）的MgO来稳定CaO。对负载型混合金属氧化物（MMO）吸附剂在650℃和大气压下的富CO₂（86% CO₂）和贫CO₂（14% CO₂）气流中进行高温CO₂捕获筛选。MMO吸附剂在86%和14% CO₂条件下每克吸附剂捕获53 - 63 wt%的CO₂，碳酸化效率约为98%，这优于石灰石衍生的CaO（L - CaO）吸附剂的CO₂捕获能力（22.8 wt%）。与基准L - CaO相比，所有合成的MMO吸附剂均表现出更高的捕获能力和循环稳定性。由于g - CaMgO吸附剂具有高碳酸化效率和循环稳定性，在贫CO₂条件下对其进行了100次每次5分钟的碳酸化/再生循环测试。g - CaMgO吸附剂表现出优异的CO₂捕获能力和循环稳定性，在100次循环后仍保留其初始捕获能力的约65%。
