Effect of cerium oxide doping on the performance of CaO-based sorbents during calcium looping cycles.
Effect of cerium oxide doping on the performance of CaO-based sorbents during calcium looping cycles.
复制标题
DOI：
10.1021/es5052843
复制
发表时间：
2015-04
影响因子：
11.4
通讯作者：
Shengping Wang;Shasha Fan;Lijing Fan;Yujun Zhao;Xinbin Ma
中科院分区：
文献类型：
--
作者：
Shengping Wang;Shasha Fan;Lijing Fan;Yujun Zhao;Xinbin Ma
采用溶胶-凝胶法合成了一系列CaO基脱硫剂，并在其中掺杂了不同含量的CeO 2。Ca/Ce摩尔比为15：1的吸附剂表现出优异的吸收容量（0.59 gCO 2/g吸附剂）和显著的循环耐久性（高达18次循环）。CaCe-15的优异捕获性能归因于CeO 2的掺杂和CeO 2颗粒的均匀分布所形成的特殊形貌。掺杂CeO 2的吸收剂具有松散的壳层连接的交联结构，有利于CaO与CO2的接触。CaO和CeO 2分散均匀，CeO 2的存在也减小了CaO的晶粒尺寸。分散良好的CeO 2起到屏障作用，有效地阻止了CaO微晶的生长和烧结，使脱硫剂具有优异的稳定性。CeO 2的掺杂还提高了吸附剂的碳酸化速率，从而在短时间内获得高容量。
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.