A highly efficient CaO-based CO2 sorbent prepared by a citrate-assisted sol-gel technique
A highly efficient CaO-based CO2 sorbent prepared by a citrate-assisted sol-gel technique
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DOI：
10.1016/j.cej.2014.09.074
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发表时间：
2015-02-15
影响因子：
15.1
通讯作者：
Sayari, Abdelhamid
中科院分区：
文献类型：
--
作者：
Radfarnia, Hamid R.;Sayari, Abdelhamid
这项工作描述了一种用于 CO2 捕获的高效铝稳定 CaO 吸附剂的开发。使用柠檬酸盐辅助溶胶-凝胶技术制备吸附剂（92.5 wt% CaO/7.5 wt% Al2O3），然后在惰性和空气气氛下分两步煅烧。该材料在温和和严酷的操作条件下进行了 31 次碳化-煅烧循环测试。在温和煅烧条件下（800-900℃，N-2气流），工作吸附容量为0.57g-CO2/g-ads，经过31个循环，没有任何失活。高稳定性归因于良好的结构特性以及 Ca9Al6O18 粘合剂在 CaO 基体中的高度分散。此外，还进行了许多参数研究来研究碳酸化和煅烧温度对材料活性的影响。应用严格的煅烧条件（100% CO2 存在下的 930 摄氏度）在操作结束时产生了 0.33 g-CO2/g-ads 的吸收，表明与先前报道的在类似条件下操作的铝稳定 CaO 吸附剂相比，当前材料具有优异的活性和稳定性。 (C) 2014 Elsevier B.V. 保留所有权利。
This work describes the development of an efficient Al-stabilized CaO sorbent for CO2 capture. The sorbent (92.5 wt% CaO/7.5 wt% Al2O3) was prepared using a citrate-assisted sol-gel technique followed by calcination in two steps, under inert and air atmospheres. The material was tested over 31 cycles of carbonation-calcination under mild and severe operating conditions. Under mild calcination condition (800-900 degrees C. N-2 flow), the working adsorption capacity was 0.57 g-CO2/g-ads over 31 cycles without any deactivation. The high stability was attributed to the favorable structural properties and high dispersion of Ca9Al6O18 binder throughout the CaO matrix. Moreover, a number of parametric studies were performed to investigate the influence of carbonation and calcination temperatures on the activity of the material. Application of severe calcination condition (930 degrees C in the presence of 100% CO2) yielded an uptake of 0.33 g-CO2/g-ads at the end of operation, indicating the superior activity and stability of the current material in comparison to previously reported Al-stabilized CaO adsorbents operated under similar conditions. (C) 2014 Elsevier B.V. All rights reserved.