CO2 capture performance of calcium-based synthetic sorbent with hollow core-shell structure under calcium looping conditions
CO2 capture performance of calcium-based synthetic sorbent with hollow core-shell structure under calcium looping conditions
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钙循环条件下空心核壳结构钙基合成吸附剂的CO2捕集性能
DOI：
10.1016/j.apenergy.2018.05.008
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发表时间：
2018-09
期刊：
影响因子：
11.2
通讯作者：
Liu Hantao
中科院分区：
文献类型：
--
作者：
Ma Xiaotong;Li Yingjie;Duan Lunbo;Edward Anthony;Liu Hantao
以电石渣、高铝水泥和葡萄糖分别作为廉价的钙前驱体、载体和碳源，采用碳微球模板法制备了具有中空核壳结构的新型钙基合成CO2吸收剂。研究了水泥添加量、制备过程中预煅烧温度、碳模板剂添加量和煅烧条件对钙基合成吸收剂在钙循环过程中CO2捕集性能的影响。所述合成吸附剂含有5重量%高铝水泥在钙循环过程中具有最高的CO2捕集能力，其主要成分为CaO和Ca 12 Al 14 O33。在温和和剧烈煅烧条件下，合成脱硫剂循环20次后的CO2捕集容量分别为0.37和0.29 g/g，比相同条件下的电石渣分别提高了57%和99%。合成的吸收剂具有中空微球形态，具有纳米结构的外壳和介孔结构，这降低了CO2的扩散阻力。采用周期性密度泛函理论（DFT）计算解释了Ca_（12）Al_（14）O_（33）能有效抑制合成吸附剂团聚和烧结的原因。提出了空心核壳模型来解释合成吸收剂的CO2捕集机理。在相同的CO2捕集效率下，合成脱硫剂煅烧炉的能耗远低于电石渣和天然石灰石。本工作设计了一种制备具有高CO2捕集能力的空心球结构合成吸附剂的方法，为高效捕集CO2与工业废弃物资源化的结合提供了一条有前途的途径。
A novel calcium-based synthetic CO2sorbent with hollow core-shell structure was prepared by a carbon microsphere template route where carbide slag, alumina cement and glucose were employed as the low-cost calcium precursor, support and carbon source, respectively. The effects of the alumina cement addition, the pre-calcination temperature during the preparation process, the carbon template addition and calcination conditions on CO2capture performances of the calcium-based synthetic sorbents were studied during calcium looping cycles. The synthetic sorbent containing 5 wt.% alumina cement possesses the highest CO2capture capacity during calcium looping cycles, which is mainly composed of CaO and Ca12Al14O33. The CO2capture capacities of the synthetic sorbent under mild and severe calcination conditions can retain 0.37 and 0.29 g/g after 20 cycles, which are 57% and 99% higher than those of carbide slag under the same conditions, respectively. The synthetic sorbent possesses a hollow micro-sphere morphology with a nano-structured shell and meso-porous structure, which decreases the diffusion resistance of CO2. Periodic density functional theory (DFT) calculations are used to explain why Ca12Al14O33can effectively retard both agglomeration and sintering of the synthetic sorbent. The hollow core-shell model is proposed to explain the CO2capture mechanism of the synthetic sorbent. For the same CO2capture efficiency, the energy consumption in the calciner using the synthetic sorbent is much lower than those using carbide slag and natural limestone. This work designs a good method to prepare the hollow sphere-structured synthetic sorbents with high CO2capture capacity and provides a promising way to integrate efficient CO2capture with the utilization of industrial waste.
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作者：
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