对功能组修改的Ni-MOF-74进行CH4/N2吸附分离的模拟研究
Yueyang Zhang1, Gaofeng Hu1, Xueting Gao2
1Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan, China.
Journal of computational chemistry
|March 14, 2024
概括
对Ni-MOF-74的功能组修改显著增强了甲 (CH4) 和 (N2) 的吸附. CH3-Ni-MOF-74显示出最佳的CH4选择性和吸附能力用于CH4/N2分离.
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.
- 计算化学计算化学
背景情况:
- 金属有机框架 (MOF),特别是Ni-MOF-74,对气体吸附有希望.
- MOFs的功能化可以调整它们的属性以适应特定的气体分离.
- 高效的甲 (CH4) 和 (N2) 分离对于天然气净化至关重要.
研究的目的:
- 研究不同功能组 (CH3,OH,NH2,OLi) 对Ni-MOF-74.4的影响.
- 评估改性Ni-MOF-74对CH4/N2混合物的吸附性能和选择性.
- 为了确定最佳的功能化MOF-74用于CH4吸附和CH4 / N2分离.
主要方法:
- 使用了大法典蒙特卡洛 (GCMC) 模拟.
- 模拟集中在原始和功能化Ni-MOF-74.4上的CH4和N2吸附.
- 分析包括吸附能力,选择性和静电电位分布.
主要成果:
- 与原始的Ni-MOF-74.4相比,所有功能组修改都增加了CH4和N2吸附能力.
- 由于有利的孔隙环境,CH3-Ni-MOF-74表现出最高的CH4吸附能力.
- -O-Ni-MOF-74由于高静电电位梯度,显示出最强的N2吸附,阻碍了CH4 / N2分离.
- 在1500kPa的混合气体的选择性顺序:CH3-Ni-MOF-74 > NH2-Ni-MOF-74 > OH-Ni-MOF-74 > Ni-MOF-74 > Li-O-Ni-MOF-74.
结论:
- Ni-MOF-74的CH3功能化导致了优异的CH4吸附和CH4/N2选择性.
- 该研究为设计用于CH4吸附和分离的功能化MOF提供了理论指导.
- 这些发现为天然气加工中的实际应用提供了宝贵的参考资料.
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