MgO/Al2O3 Sorbent for CO2 Capture
MgO/Al2O3 Sorbent for CO2 Capture
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DOI：
10.1021/ef100817f
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发表时间：
2010-10-01
期刊：
影响因子：
5.3
通讯作者：
Sun, Yuhan
中科院分区：
文献类型：
--
作者：
Li, Lei;Wen, Xia;Sun, Yuhan
在固定床上研究了MgO/Al2O3吸附剂的低温捕集CO2性能。结果表明，MgO/Al2O3吸附剂在掺量为MgO/Al2O3的情况下具有最大的CO2捕集能力，这源于吸附剂的物理吸附和化学吸附的平衡。CO2捕集量随水蒸气的增加先增大后减小。在60℃、13 vol % CO2条件下，水蒸气浓度分别为0和13 vol v时，总CO2捕集能力分别高达0.97和1.36 mmol/g。通过多级吸附/解吸循环可以接近高浓度CO2，在350℃下吸附剂可以再生，即使经过5次循环也能保持稳定。此外，提出了一个失活模型，可以很好地预测CO2突破曲线。结果表明，有水蒸气时的吸附速率参数大于无水蒸气时的吸附速率参数。这可能是由于在水蒸气存在的情况下，吸收剂在吸收CO2之前增加了反应性。
The MgO/Al2O3 sorbent for CO2 capture under low temperatures was investigated in a fixed bed. It was found that, with MgO loading of ID wt MgO/Al2O3 sorbent showed a maximum CO2 capture capacity, which originated from the balance of physical adsorption and chemical absorption of the sorbent. The CO2 capture capacity increased with the water vapor at first and then decreased. Typically, the total CO2 capture capacities were as high as 0.97 and 1.36 mmol/g, with water vapor concentration of 0 and 13 vol V. respectively, at 60 degrees C with 13 vol % CO2. The high CO2 concentration could he approached by the multistage absorption/desorption cycles, during which the sorbent could be regenerated at 350 degrees C and maintained stable even after 5 cycles. In addition, a deactivation model was proposed that gave good predictions of the CO2 breakthrough curves. Results showed that sorption rate parameters obtained in the presence of water vapor were found to be larger than the corresponding values in the absence of water vapor. It was possibly caused by increasing the reactivity of the sorbent prior to the sorption of CO2 in the presence of water vapor.