Adsorption and separation of CH<sub>4</sub>-N<sub>2</sub> with different structural MOFs

HU Jiangliang; SUN Tianjun; LIU Xiaowei; LI Defu; ZHAO Shengsheng; WANG Shudong

doi:10.11949/j.issn.0438-1157.20151059

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Adsorption and separation of CH₄-N₂ with different structural MOFs

更新时间：2025-12-10

- Adsorption and separation of CH₄-N₂ with different structural MOFs
- CIESC Journal Issue 9, Pages: 3518-3528(2015)
- 作者机构：
  
  1. 中国科学院大连化学物理研究所洁净能源国家实验室, 催化基础国家重点实验室,辽宁,大连,116023
  2. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151059
  CLC： Q028.1
- Online First：05 September 2015，
  
  Published：05 September 2015
- 稿件说明：
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HU Jiangliang, SUN Tianjun, LIU Xiaowei, et al. Adsorption and separation of CH₄-N₂ with different structural MOFs[J]. CIESC Journal, 2015, (9): 3518-3528. DOI: 10.11949/j.issn.0438-1157.20151059.
DOI：

HU Jiangliang, SUN Tianjun, LIU Xiaowei, et al. Adsorption and separation of CH₄-N₂ with different structural MOFs[J]. CIESC Journal, 2015, (9): 3518-3528. DOI: 10.11949/j.issn.0438-1157.20151059. DOI：

摘要

针对甲烷氮气的分离难题

通过溶剂热法大量合成了6种典型的由单齿、多齿与多元配体构建的金属有机框架材料

并利用单组分静态与双组分动态吸附法分别研究了甲烷与氮气在材料中的吸附行为。研究结果表明

MOFs材料相对较弱的极性

致使其甲烷氮气的分离选择性明显优于Si/Al分子筛;多齿配体MOFs材料因配体较长

孔道较大

具有与活性炭相当的甲烷氮气分离选择性;MOFs中的不饱和金属位增大了孔道极性

不利于分离性能的提高;单齿甲酸配体构建的超微孔[Ni3(HCOO)6]框架具有非常优异的CH4/N2分离性能

其选择性高达7.0

是Si/Al分子筛与活性炭的2倍。这为高效甲烷氮气分离材料的设计提供了新的参考依据。

Abstract

For CH4-N2 separation with high-efficiency

several typical MOFs based on different ligands with high surface areas were synthesized in large scale via the simple solvothermal method

and their CH4/N2 separation performance was investigated experimentally by pure gas adsorption and binary gas breakthrough experiments. The results show that the adsorptive separation selectivity of most MOFs is much higher than that of Si/Al zeolites owing to their lower polarity

and the selectivity of MOFs with multidentate ligands are similar with that of high-quality activated carbon because their wide pore sizes resulted from the long linkers are not good for the separation of CH4/N2. In addition

the open metal sites in MOFs increase channel polarity

which is not conducive to improving the separation selectivity of CH4/N2 mixtures. Fortunately

the ultra-microporous adsorbent (0.5 nm) based on monodentate ligand

namely [Ni3(HCOO)6] synthesized by the short linker of HCOO- and Ni2+

has a much higher selectivity up to 7.0

twice that of conventional adsorbents

such as Si/Al zeolites and actvited carbons. In a word

the knowledge obtained in this work provides a foundation for the design of new nanoporous materials towards the CH4/N2 separation with high-efficiency.

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Adsorption and separation of CH4-N2 with different structural MOFs

DOI：10.11949/j.issn.0438-1157.20151059

摘要

Abstract

关键词

Keywords

references

Adsorption and separation of CH₄-N₂ with different structural MOFs