Structurally improved CaO-based sorbent by organic acids for high temperature CO2 capture
Structurally improved CaO-based sorbent by organic acids for high temperature CO2 capture
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通过有机酸结构改进的 CaO 基吸附剂用于高温 CO2 捕集
DOI：
10.1016/j.fuel.2015.11.048
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发表时间：
2016-03-01
期刊：
影响因子：
7.4
通讯作者：
Xu, Minghou
中科院分区：
文献类型：
--
作者：
Hu, Yingchao;Liu, Wenqiang;Xu, Minghou
采用酸化-分解工艺提高天然石灰石的性能。采用一系列潜在的有机酸对石灰石进行改性，制得高温CO2捕集用CaO基吸附剂。所研究的有机酸包括甲酸、醋酸、丙酸、一水柠檬酸、二水草酸、乳酸、L-(-)-苹果酸和L-(+)-酒石酸。其中，后三种是首次用来对石灰石进行改性以获得CaO基吸附剂的新型酸。考察了脱硫剂的循环碳化焙烧性能。除甲酸修饰的吸附剂外，所有的吸附剂都表现出了更好的捕集二氧化碳的性能。其中，经L-(+)-酒石酸(S-T)改性的新型脱硫剂表现出最好的循环性能，第26次碳化转化率接近36%，几乎是未改性脱硫剂的两倍。在模拟的含氧燃料气氛(燃烧后二氧化碳捕集的真实焙烧气氛)下进行测试时，也发现了该吸附剂的优越性能。认为有机酸的结构改善有利于减少烧结和比表面积(SSA)的损失，从而使该脱硫剂具有优异的性能。(C)2015爱思唯尔有限公司。保留所有权利。
The acidification-decomposition process was used to enhance the performance of the natural limestone. A series of potential organic acids was employed to modify limestone to produce CaO-based sorbents for high temperature CO2 capture. The organic acids studied include formic acid, acetic acid, propionic acid, citric acid monohydrate, oxalic acid dihydrate, lactic acid, L-(-)-malic acid, and L-(+)-tartaric acid. Particularly, the latter three are novel acids used for the first time to modify limestone to obtain the CaO-based sorbents. The cyclic carbonation-calcination performance of the sorbents was investigated. All the sorbents, except the one modified by formic acid, exhibit the improved performance for capturing CO2. In particular, the novel sorbent modified by L-(+)-tartaric acid (S-T) shows the best cyclic performance with a high carbonation conversion of similar to 36% at the 26th cycle, almost twice of that of unmodified sorbent. The superior performance of this sorbent was also found when tested under the simulated oxyfuel atmosphere (realistic calcination atmosphere for post-combustion CO2 capture). It is believed that the improved structure by organic acid, which is in favor of mitigating the sintering and loss of specific surface area (SSA), has contributed to the superior performance of the sorbent. (C) 2015 Elsevier Ltd. All rights reserved.