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.
Environ Sci Technol. 2015 Apr 21;49(8):5021-7. doi: 10.1021/es5052843. Epub 2015 Apr 7.
A series of CaO-based sorbents were synthesized through a sol-gel method and doped with different amounts of CeO2. The sorbent with a Ca/Ce molar ratio of 15:1 showed an excellent absorption capacity (0.59 gCO2/g sorbent) and a remarkable cycle durability (up to 18 cycles). The admirable capture performance of CaCe-15 was ascribed to its special morphology formed by the doping of CeO2 and the well-distributed CeO2 particles. The sorbents doped with CeO2 possessed a loose shell-connected cross-linking structure, which was beneficial for the contact between CaO and CO2. CaO and CeO2 were dispersed homogeneously, and the existence of CeO2 also decreased the grain size of CaO. The well-dispersed CeO2, which could act as a barrier, effectively prevented the CaO crystallite from growing and sintering, thus the sorbent exhibited outstanding stability. The doping of CeO2 also improved the carbonation rate of the sorbent, resulting in a high capacity in a short period of time.
通过溶胶-凝胶法合成了一系列基于 CaO 的吸附剂，并掺杂了不同量的 CeO2。Ca/Ce 摩尔比为 15:1 的吸附剂表现出优异的吸收容量（0.59 gCO2/g 吸附剂）和显著的循环耐久性（可达 18 次循环）。CaCe-15 的令人钦佩的捕获性能归因于 CeO2 的掺杂形成的特殊形态和 CeO2 颗粒的良好分布。掺杂 CeO2 的吸附剂具有疏松的壳连接交联结构，有利于 CaO 和 CO2 之间的接触。CaO 和 CeO2 均匀分散，CeO2 的存在还降低了 CaO 的晶粒尺寸。分散良好的 CeO2 可以作为屏障，有效阻止 CaO 晶核的生长和烧结，从而使吸附剂表现出优异的稳定性。CeO2 的掺杂还提高了吸附剂的碳化速率，使其在短时间内具有高容量。
