Toward the Insights into Fast CO2 Absorption over Novel Nanostructured MgO-Based Sorbent,Industrial & Engineering Chemistry Research

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Toward the Insights into Fast CO2 Absorption over Novel Nanostructured MgO-Based Sorbent
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-07-26 , DOI: 10.1021/acs.iecr.8b01294
Lixia Yang ₁ , Dan Liu ₂ , Pingping Wang ₂ , Hwimin Seo ₃ , Jianzhou Gui _{1,

2} , Yong-Ki Park ₃

Affiliation

A uniform nanoplate-like MgO-based sorbents were prepared with eitelite and hydromagnesite intergrowing each other, and their CO₂ capture capacity was evaluated for fast CO₂ absorption in the thermal swing absorption process, with model wet industrial flue gas at a CO₂ concentration of 14.5 vol %, at ambient pressure. Fast absorption and desorption rate, acceptable dynamic absorption capacity, and good cyclic stability (9 wt % after recycling 100 times) have been obtained. Some theoretical work has been carried out and found eitelite was the only origin of the active MgO species for fast CO₂ uptake in TSA process. Nitrate was also demonstrated to have some promotive effect in CO₂ fast absorption on the active MgO species. The effectiveness of eitelite was close related to its special crystal structure, i.e., after calcination, the special layer assembling with the proximity of Na⁺ and O^2– at a molecular level probably contributed to the fast absorption. Meanwhile, the void space caused by decarbonization of hydromagnesite may also facilitate the absorption and diffusion of CO₂. Therefore, this sorbent has been demonstrated to be a potential absorbent for postcombustion CO₂ capture from fossil-fuel-fired power plant.

中文翻译：

寻求新型基于纳米结构的基于MgO的吸附剂快速吸收CO ₂的见解

均匀的纳米板状MgO系吸附剂用eitelite和水菱镁矿intergrowing彼此制备，并且它们的CO ₂捕获能力进行了评价快速CO ₂以CO在变温吸收过程的吸收，与模型湿工业烟道气₂浓度在环境压力下为14.5％（体积）。获得了快速的吸收和解吸速率，可接受的动态吸收容量以及良好的循环稳定性（循环使用100次后为9 wt％）。已经进行了一些理论上的工作，并且发现了沸石是TSA过程中快速吸收CO ₂的活性MgO物种的唯一来源。硝酸盐还被证明对CO ₂有一定的促进作用。快速吸收活性MgO物种。沸石的功效与其特殊的晶体结构密切相关，即煅烧后，在分子水平上与Na ⁺和O ^2–接近的分子组装在一起的特殊层可能有助于快速吸收。同时，由菱镁矿的脱碳引起的空隙空间也可以促进CO ₂的吸收和扩散。因此，已经证明该吸附剂是用于从化石燃料发电厂捕获燃烧后CO ₂的潜在吸收剂。

更新日期：2018-07-26

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