Faculty of Physics, University of Seville, Avenida Reina Mercedes s/n, 41012 Seville, Spain.
Environ Sci Technol. 2012 Jun 5;46(11):6401-8. doi: 10.1021/es3002426. Epub 2012 May 21.
In this paper we show the performance of a new CO(2) sorbent consisting of a dry physical mixture of a Ca-based sorbent and a SiO(2) nanostructured powder. Thermo-gravimetric analysis (TGA) performed at conditions close to the Ca-looping process demonstrate that the rate of CO(2) capture by the mixture is enhanced during the fast carbonation stage of practical interest in applications. Moreover, the residual capture capacity of the mixture is increased. SEM/EDX, physisorption, and XRD analyses indicate that there is a relevant interaction between the nanostructured SiO(2) skeleton and CaO at high temperatures, which serves to improve the efficiency of the transfer of CO(2) to small reactive pores as well as the stability of the sorbent pore structure.
本文展示了一种新型 CO2 吸附剂的性能，该吸附剂由一种基于 Ca 的吸附剂和一种 SiO2 纳米结构粉末的干物理混合物组成。在接近 Ca 循环过程的条件下进行的热重分析（TGA）表明，在应用中实际关注的快速碳酸化阶段，混合物的 CO2 捕获速率得到了提高。此外，混合物的残余捕获容量也得到了提高。SEM/EDX、物理吸附和 XRD 分析表明，在高温下，纳米结构的 SiO2 骨架和 CaO 之间存在着重要的相互作用，这有助于提高 CO2 向小反应性孔转移的效率以及吸附剂孔结构的稳定性。
