Studies on CO2 uptake by CaO/Ca3Al2O6 sorbent in calcium looping cycles
Studies on CO2 uptake by CaO/Ca3Al2O6 sorbent in calcium looping cycles
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CaO/Ca3Al2O6 吸附剂在钙循环中吸收 CO2 的研究
DOI：
10.1007/s10973-015-4480-9
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发表时间：
2015-06-01
影响因子：
4.4
通讯作者：
Wu, Shuimu
中科院分区：
文献类型：
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作者：
Li, Yingjie;Shi, Lei;Wu, Shuimu
在这项工作中，提出通过燃烧合成法制备石灰石、水合硝酸铝和甘油水溶液来制备合成CaO/Ca3Al2O6吸附剂，用于钙循环循环中的CO2捕获。在双固定床反应器和热重分析仪中研究了CaO与Al2O3的质量比、循环次数、碳酸化条件和煅烧条件对所得合成吸附剂在重复碳酸化/煅烧循环中吸收CO2的影响。合成吸附剂制备过程中CaO与Al2O3的最佳质量比为90:10，50个循环后其CO2吸收量为0.43 g g−1。合成吸附剂的主要成分为CaO:Al2O3 = 90:10质量比为CaO和Ca3Al2O6,其中CaO与Ca3Al2O6的质量比为74:26。 CaO/Ca3Al2O6 吸收的 CO2 在前 5 分钟内随碳酸化时间快速增加，5 分钟后缓慢增加。在每个循环中，CaO/Ca3Al2O6 达到最大 CO2 吸收率的碳化时间比来自石灰石的 CaO 快得多。 CaO/Ca3Al2O6 的最佳碳酸化温度窗口为 650–700 °C。在循环中更苛刻的煅烧条件下，CaO/Ca3Al2O6吸附剂具有明显高于CaO的烧结阻力。 CaO/Ca3Al2O6 的高 CO2 吸收能力归因于其在多次碳酸化/煅烧循环中稳定的多孔结构。
In this work, limestone, aluminum nitrate hydrate, and glycerol water solution by combustion synthesis method were proposed to prepare a synthetic CaO/Ca3Al2O6 sorbent for CO2 capture in calcium looping cycles. The effects of the mass ratio of CaO to Al2O3, cycle number, carbonation conditions, and calcination conditions on the CO2 uptake by the obtained synthetic sorbent in the repeated carbonation/calcination cycles were studied in a dual fixed-bed reactor and a thermogravimetric analyzer. The optimum mass ratio of CaO to Al2O3 was 90:10 in the preparation process of the synthetic sorbent, which exhibited a 0.43 g g−1 of CO2 uptake after 50 cycles. The main compositions of the synthetic sorbent contained the mass ratio of CaO:Al2O3 = 90:10 were CaO and Ca3Al2O6, and the mass ratio of CaO to Ca3Al2O6 was 74:26. The CO2 uptake by CaO/Ca3Al2O6 increases rapidly with the carbonation time in previous 5 min and then rises slowly after 5 min. The carbonation time to reach the maximum CO2 uptake rate of CaO/Ca3Al2O6 was much sooner than that of CaO derived from limestone in each cycle. The optimum carbonation temperature window of CaO/Ca3Al2O6 was 650–700 °C. CaO/Ca3Al2O6 sorbent possessed obviously higher sintering resistance than CaO under the more severe calcination conditions in the cycles. The high CO2 uptake capacity of CaO/Ca3Al2O6 was attributed to its stable porous structure in the multiple carbonation/calcination cycles.