类似于石墨烯/聚合物气凝形态来推进CO2/N2燃烧后CO2捕获过程的选择性
Iranzu Barbarin1, Monika Fidanchevska1, Nikolaos Politakos1
1POLYMAT and Department of Applied Chemistry, University of the Basque Country UPV/EHU, 20018 Donostia-San Sebastián, Spain.
Industrial & engineering chemistry research
|April 29, 2024
概括
研究人员从减少的氧化石墨烯和聚合物中开发了先进的气凝,以从 (N2) 中捕获二氧化碳 (CO2). 这些材料对二氧化碳具有十倍以上的选择性,显著推进了碳捕获技术.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 将二氧化碳 (CO2) 与 (N2) 分离,对于燃烧后的碳捕获至关重要.
- 烟气中低二氧化碳度 (3-15%) 给传统的碳基吸附剂带来了挑战,因为它们的选择性很低.
- 现有的吸附剂在有效的CO2/N2分离方面扎,阻碍了有效的碳捕获和封存 (CCS).
研究的目的:
- 为了提高复合气凝的CO2/N2选择性.
- 为了提高二氧化碳吸附能力,同时最大限度地减少二氧化吸附.
- 为了研究气凝表面化学,多孔性,形态和二氧化碳捕获性能之间的关系.
主要方法:
- 使用减少氧化石墨烯 (rGO) 和功能化聚合物颗粒合成复合气凝.
- 在合成过程中表面化学和微孔性的现场修饰.
- 气凝表面特性,包括功能组,毛孔大小分布和表面形态的描述.
主要成果:
- 与参考材料相比,新型气凝的CO2/N2选择性增加了10倍以上.
- 获得的选择性值在470至621之间,二氧化碳吸附能力接近2mmol/g.
- 修改合成导致了表面氧功能组的增加,增强了微孔性 (<2 nm和<5 nm),并向更硬的"纹纸"形态转变.
结论:
- 开发的基于rGO的复合气凝显示出异常高的CO2/N2选择性,达到碳基吸附剂中报告的最高水平.
- 这项研究证实了吸附剂弹性,表面功能化,微孔性和CO2 / N2选择性之间的联系,为N2恐惧性提供了新的视角.
- 这些气凝是CCS应用中高效的燃烧后二氧化碳捕获的非常有希望的材料.
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