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Mitigation of CO2 emissions by hydrotalcites of Mg3Al-CO3 at 0 °C and high pressure
Applied Clay Science ( IF 5.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.clay.2020.105950
D. Suescum-Morales , D. Cantador-Fernández , J.R. Jiménez , J.M. Fernández

Abstract This work shows the maximum CO2 capture capacity, using CO2 isotherms at 0, 20 and 30 °C and pressures of up to 35 atm, of four adsorbents with different particle size distribution and different pore size distribution: two hydrotalcites of Mg3Al-CO3, one synthesized in laboratory (C1) and another commercial (C2) and two calcined (C1 500 and C2 500) obtained from C1 and C2 by calcination at 500 °C for 2 h, respectively. The maximum capture capacities were obtained for samples calcined (CLDH), 98.16 mg·g−1 for C2 500 sample and 142.02 mg·g−1 for sample C1 500, both at 0 °C and 34.28 atm. The capture capacity of the C2 500 sample was the least influenced by temperature changes, which could be related to the porous structure of the samples. Consequently, for applications that are carried out between 0 and 30 °C, the best sample will be C2 500. Previously the samples were characterized by X-ray diffraction, transmission and scanning electron microscopy, thermogravimetric and thermo-differential analysis, particle size distribution and pore size distribution by N2 adsorption isotherms. The CO2 adsorption isotherms data were adjusted to the Freundlich, Langmuir, Dubinin-Radushkevich y Temkin models. These two last models confirmed that the nature for CO2 adsorption was physical. In short, this work showed the usefulness of calcined hydrotalcite as a CO2 adsorbent, using low temperature (0 °C) and high pressure (34.28 atm) as working conditions.

中文翻译:

在 0 °C 和高压下通过 Mg3Al-CO3 水滑石减少 CO2 排放

摘要 本工作显示了使用 0、20 和 30 °C 下的 CO2 等温线和高达 35 个大气压的压力,具有不同粒径分布和不同孔径分布的四种吸附剂的最大 CO2 捕获能力:Mg3Al-CO3 的两种水滑石,一种是实验室合成的(C1),另一种是商业化的(C2),另外两种是通过分别在 500°C 下煅烧 2 小时从 C1 和 C2 获得的煅烧(C1 500 和 C2 500)。在 0 °C 和 34.28 atm 下,煅烧样品 (CLDH) 获得了最大捕获能力,C2 500 样品为 98.16 mg·g-1,C1 500 样品为 142.02 mg·g-1。C2 500 样品的捕获能力受温度变化的影响最小,这可能与样品的多孔结构有关。因此,对于在 0 到 30 °C 之间进行的应用,最好的样品是 C2 500。此前,样品通过 X 射线衍射、透射和扫描电子显微镜、热重和热微分分析、粒度分布和孔径分布通过 N2 吸附等温线进行表征。CO2 吸附等温线数据根据 Freundlich、Langmuir、Dubinin-Radushkevich y Temkin 模型进行调整。这最后两个模型证实了 CO2 吸附的性质是物理的。简而言之,这项工作显示了煅烧水滑石作为 CO2 吸附剂的有用性,使用低温 (0 °C) 和高压 (34.28 atm) 作为工作条件。CO2 吸附等温线数据根据 Freundlich、Langmuir、Dubinin-Radushkevich y Temkin 模型进行调整。这最后两个模型证实了 CO2 吸附的性质是物理的。简而言之,这项工作显示了煅烧水滑石作为 CO2 吸附剂的有用性,使用低温 (0 °C) 和高压 (34.28 atm) 作为工作条件。CO2 吸附等温线数据根据 Freundlich、Langmuir、Dubinin-Radushkevich y Temkin 模型进行调整。这最后两个模型证实了 CO2 吸附的性质是物理的。简而言之,这项工作显示了煅烧水滑石作为 CO2 吸附剂的有用性,使用低温 (0 °C) 和高压 (34.28 atm) 作为工作条件。
更新日期:2020-12-01
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