The effect of water on the activation and the CO2 capture capacities of alkali metal-based sorbents
The effect of water on the activation and the CO2 capture capacities of alkali metal-based sorbents
复制标题
DOI：
10.1007/bf02706737
复制
发表时间：
2006-05-01
影响因子：
2.7
通讯作者：
Kim, Jae Chang
中科院分区：
文献类型：
--
作者：
Lee, Soo Chool;Choi, Bo Yun;Kim, Jae Chang
通过将碳酸钾（K2 CO 3）或碳酸钠（Na 2CO 3）浸渍在载体（活性炭（AC）和Al 2 O3）上制备碱金属基吸附剂。在固定床反应器中在低温条件下（CO，在60 ℃下吸收和在150 ℃下再生）测量CO，吸收和再生性能。活性炭负载碳酸钾（K_2CO_3/AC）是一种主要的吸附剂，其总CO_2捕集能力高于其它吸附剂。这种吸附剂完全再生，并通过加热用过的吸附剂转化为其原始相。在吸收CO之前的活化过程需要在60 ℃或90 ℃下在含有1.3-52体积% H2O的湿氮中进行2小时。X射线衍射分析表明，活化过程在CO_3吸附中起重要作用，形成了新的活性物种K_2CO_3中心点1.5H_2O。结果表明，预处理后的K_4H_2（CO_3）_3中心点1.5H（2）O相经过量水干燥后可形成新的活性物种（K_2CO_3中心点1.5H（2）O）。
Alkali metal-based sorbents were prepared by the impregnation either of potassium carbonate (K2CO3) or of sodium carbonate (Na2CO3) on the supports (activated carbon (AC) and Al2O3). The CO, absorption and regeneration properties were measured in a fixed bed reactor at the low temperature conditions (CO, absorption at 60 degrees C and regeneration at 150 degrees C). The potassium carbonate which was supported on the activated carbon (K2CO3/AC) was clarified as a leading sorbent, of which the total CO, capture capacity was higher than those of other sorbents. This sorbent was completely regenerated and transformed to its original phase by heating the used sorbent. The activation process before CO, absorption needed moisture nitrogen containing 1.3-52 vol% H2O for 2 hours either at 60 degrees C or at 90 degrees C. The activation process played an important role in CO, absorption, in order to form new active species defined as K2CO3 center dot 1.5 H2O, by X-ray diffraction. It was suggested that the new active species (K2CO3 center dot 1.5H(2)O) could be formed by drying the K4H2(CO3)(3)center dot 1.5H(2)O phase formed after pre-treatment with excess water.