当前位置: X-MOL 学术J. CO2 Util. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Role of heteroatoms (nitrogen and sulfur)-dual doped corn-starch based porous carbons for selective CO2 adsorption and separation
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2021-07-08 , DOI: 10.1016/j.jcou.2021.101641
Ghazanfar Nazir 1 , Adeela Rehman 1 , Soo-Jin Park 1
Affiliation  

Herein, we have produced two series of novel materials including heteroatoms-doped (thiourea-modified) and heteroatoms-deprived microporous carbons using three different potassium salts activators (KOH, K2CO3, K2C2O4). The experimental results reveal that thiourea-modified KOH activated sample exhibit excellent textural features (specific surface area∼1795 m2/g, micropore volume∼0.82 cm3/g) but at the expense of a reduced heteroatom content. However, sample prepared with K2C2O4 exhibited a comparable specific surface area (∼1747 m2/g), enough population of narrow micropores (<1.0 nm), the highest micropore volume (0.93 cm3/g) and a high nitrogen (4.6 at. %) and sulfur content (2.3 at. %). Therefore, the optimized sample, STO, exhibits remarkable CO2 adsorption (269.61 mg/g at 0 °C and 1 bar), excellent IAST CO2/N2 selectivity (73), high isosteric heat of adsorption (39.3 kJ/mol) and high cyclic stability, surpassing the CO2 adsorption/separation performance of most of the biomass-derived carbons. Herein, for the first time, a comprehensive study on potassium salts activation, in comparison with the conventionally practiced KOH activation, is presented. Concluding, the experimental results unveiled K2C2O4 as a more competitive and less corrosive potassium salt activating agent by virtue of its ability to fabricate N, S dual-doped highly porous carbons for efficient CO2 adsorption and separation.



中文翻译:

杂原子(氮和硫)-双掺杂玉米淀粉基多孔碳在选择性 CO 2吸附和分离中的作用

在此,我们使用三种不同的钾盐活化剂(KOH、K 2 CO 3、K 2 C 2 O 4)生产了两个系列的新型材料,包括杂原子掺杂(硫脲改性)和杂原子去除微孔碳。实验结果表明,硫脲改性的 KOH 活化样品表现出优异的结构特征(比表面积~1795 m 2 /g,微孔体积~0.82 cm 3 /g),但以降低杂原子含量为代价。然而,用 K 2 C 2 O 4制备的样品表现出相当的比表面积(~1747 m 2/g)、足够多的窄微孔 (<1.0 nm)、最高的微孔体积 (0.93 cm 3 /g) 和高氮 (4.6 at. %) 和硫含量 (2.3 at. %)。因此,优化的样品 STO 表现出显着的 CO 2吸附(269.61 mg/g 在 0 °C 和 1 bar)、出色的 IAST CO 2 /N 2选择性(73)、高等量吸附热(39.3 kJ/mol)和高循环稳定性,超过了大多数生物质衍生碳的 CO 2吸附/分离性能。在此,首次对钾盐活化与常规实践的 KOH 活化进行了综合研究。最后,实验结果揭示了 K 2 C2 O 4作为一种更具竞争力和腐蚀性较小的钾盐活化剂,因为它能够制造用于高效 CO 2吸附和分离的N、S 双掺杂高多孔碳。

更新日期:2021-07-08
down
wechat
bug