Monoethanolamine-Modified Attapulgite-Based Amorphous Silica for the Selective Adsorption of CO2 from Simulated Biogas,Energy & Fuels

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Monoethanolamine-Modified Attapulgite-Based Amorphous Silica for the Selective Adsorption of CO2 from Simulated Biogas
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-01-29 , DOI: 10.1021/acs.energyfuels.9b03997
Qinglin Li _{1,

2} , Hairong Zhang _{1,

3,

4,

5} , Fen Peng _{1,

3,

4,

5} , Can Wang _{1,

3,

4,

5} , Hailong Li _{1,

3,

4,

5} , Lian Xiong _{1,

3,

4,

5} , Haijun Guo _{1,

3,

4,

5} , Xinde Chen _{1,

3,

4,

5}

Affiliation

Biogas upgrading technology is important for increasing the heating value of biogas through selective adsorption of CO₂. In this work, a series of new monoethanolamine (MEA)-modified attapulgite (ATP)-based amorphous silica (a-SiO₂) sorbents with a large surface area and oxygen vacancies were prepared by the impregnation method for the selective adsorption of CO₂ from simulated biogas. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and N₂ adsorption–desorption results indicated that MEA with suitable loading was anchored onto the external surface of a-SiO₂, which could improve the dispersion of rodlike fibers of ATP. MEA loading and reaction temperature optimization experiments showed that the 50MEA/a-SiO₂ sorbent achieved the highest CO₂ adsorption capacity of 2.14 mmol/g with an amine efficiency of 5.22 mmol/g and 0.32 mol/mol at 60 °C. Furthermore, only a 6.3 and 4.7% reduction of CO₂ adsorption capacity occurred after five adsorption–desorption cycles under simulated biogas at 30 and 60 °C adsorption, respectively, indicating that the sorbent has good regenerability and thermal stability. The chemical adsorption was proved to be the CO₂ adsorption mechanism of MEA-modified ATP-based a-SiO₂ sorbent by XRD and FTIR testing.

中文翻译：

单乙醇胺改性的凹凸棒石为基础的非晶硅对模拟沼气中CO ₂的选择性吸附

沼气提质技术对于通过选择性吸附CO ₂来提高沼气的热值非常重要。在这项工作中，通过浸渍法制备了一系列新的单乙醇胺（MEA）改性的凹凸棒石（ATP）基无定形二氧化硅（a-SiO ₂）吸附剂，该吸附剂具有大的表面积和氧空位，可以选择性吸附CO _2。来自模拟沼气。傅里叶变换红外光谱（FTIR），扫描电子显微镜（SEM）和N ₂吸附-解吸结果表明，具有合适负载的MEA固定在a-SiO ₂的外表面上，可以改善ATP棒状纤维的分散性。MEA负载和反应温度优化实验表明，在60°C下，50MEA / a-SiO ₂吸附剂的最高CO ₂吸附容量为2.14 mmol / g，胺效率为5.22 mmol / g和0.32 mol / mol。此外，在模拟沼气中分别在30和60°C的吸附下进行五个吸附-解吸循环后，CO ₂吸附能力仅分别降低了6.3和4.7％，表明该吸附剂具有良好的可再生性和热稳定性。通过XRD和FTIR测试证明，化学吸附是MEA改性的ATP基a-SiO ₂吸附剂的CO ₂吸附机理。

更新日期：2020-01-29

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