Development of a CaO-based sorbent with improved cyclic stability for CO2 capture in pressurized carbonation
Development of a CaO-based sorbent with improved cyclic stability for CO2 capture in pressurized carbonation
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DOI：
10.1016/j.cej.2011.03.091
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发表时间：
2011-06
影响因子：
15.1
通讯作者：
Huichao Chen;Changsui Zhao
中科院分区：
文献类型：
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作者：
Huichao Chen;Changsui Zhao
本研究旨在通过共沉淀法开发一种具有高吸附容量和长寿命的CO2吸附剂。对合成条件进行了优化。在最佳合成条件下合成的吸收剂具有较高的碳化速率和CO2吸收率，且抗烧结性能得到了显著改善。碳酸化转化率的衰减取决于多个碳酸化/煅烧循环期间的反应条件和循环次数。700 °C和0.5 MPa的组合被认为是最佳吸收剂获得高循环CO2捕获能力的最佳条件，即在15%CO2和85%N2的气氛中，与石灰石相比，10次循环的CO2捕获能力提高35%，50次循环的CO2捕获能力提高79%。不同粒径分布对CO2吸收影响不大。在50次循环后实现了0.86的平均转化率。表征结果未能显示在700 °C和0.5 MPa下多次循环之前和之后吸附剂的形态或结构性质的任何显著差异，这解释了吸附剂的上级性能。脱硫剂的活性组分为CaO，而Ca 9Al 6 O 18和MgO提供了稳定的骨架，抑制了CaO的失活。
This study focuses on developing a CO2sorbent with high sorption capacity and long life by a coprecipitation method. The synthesis conditions were optimized. The sorbent synthesized under the optimal synthesis conditions presented a high carbonation rate and high CO2uptake with greatly improved resistant against sintering behavior. The decay in carbonation conversion depended on the reaction conditions and the number of cycles during multiple carbonation/calcination cycles. A combination of 700 °C and 0.5 MPa was considered as an optimal condition for the best sorbent to achieve high cyclic CO2capture capacity, i.e. increased by 35% for 10 cycles and by 79% for 50 cycles compared with limestone in the atmosphere of 15% CO2and 85% N2. Little effect was found on CO2uptake with different particle size distribution. An average conversion of 0.86 after 50 cycles was achieved. Characterization results failed to show any significant difference in morphological or structural properties of the sorbent before and after multiple cycles at 700 °C and 0.5 MPa which explained the superior performance of the sorbent. The active component of the sorbent was CaO, while the Ca9Al6O18and MgO provided a stable framework inhibiting deactivation of CaO.