Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University ; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.
ACS Appl Mater Interfaces. 2014 Oct 22;6(20):18072-7. doi: 10.1021/am5049527. Epub 2014 Oct 6.
In this paper, we report the development of synthetic CaO-based sorbents via a fast precipitation method with the assistance of sodium poly(styrenesulfonate) (PSS). The effect of PSS on physical properties of the CaO sorbents and their CO2 capture performance were investigated. The presence of PSS dispersed the CaO particles effectively as well as increased their specific surface area and pore volume remarkably. The obtained porous spherical structure facilitated CO2 to diffuse and react with inner CaO effectively, resulting in a significant improvement in initial CO2 carbonation capacity. A proper amount of Mg(2+) precursor solution was doped during a fast precipitation process to gain CaO-based sorbents with a high anti-sintering property, which maintained the porous spherical structure with the high specific surface area. CaO-based sorbents derived from a MgxCa1-xCO3 precursor existed in the form of CaO and MgO. The homogeneous distribution of MgO in the CaO-based sorbents effectively prevented the CaO crystallite from growing and sintering, further resulting in the favorable long-term durability with carbonation capacity of about 52.0% after 30 carbonation/calcination cycles.
本文采用快速沉淀法，在聚磺酸钠（PSS）的辅助下制备了合成的 CaO 基吸附剂。研究了 PSS 对 CaO 吸附剂物理性能及其 CO2 捕集性能的影响。PSS 的存在可以有效地分散 CaO 颗粒，显著提高其比表面积和孔体积。所得到的多孔球形结构有利于 CO2 扩散并与内部的 CaO 有效反应，从而显著提高了初始 CO2 碳化容量。在快速沉淀过程中适当掺杂 Mg(2+)前体溶液，可以获得具有高抗烧结性能的 CaO 基吸附剂，保持高比表面积的多孔球形结构。源于 MgxCa1-xCO3 前体的 CaO 基吸附剂以 CaO 和 MgO 的形式存在。MgO 在 CaO 基吸附剂中的均匀分布有效地阻止了 CaO 晶体的生长和烧结，进一步导致其具有良好的长期耐久性，经过 30 次碳化/煅烧循环后，碳化容量约为 52.0%。
