Scholarlink

<p>Separating perfluoropropane (C<sub>3</sub>F<sub>8</sub>) electronic specialty gas from C<sub>3</sub>F<sub>6</sub>/C<sub>3</sub>F<sub>8</sub> mixtures is a challenging issue because of their similar physical properties and the stringent industrial purity standards for C<sub>3</sub>F<sub>8</sub>. We present a cage-based metal-organic framework (MOF) (JXNU-22) constructed from [Fe<sub>2</sub>Co(μ<sub>3</sub>-O)] clusters bridged by 4-(1H-tetrazol-5-yl)benzoic and 2,4,6-tri(4-pyridyl)-1,3,5-triazine (TPT) linkers, which features trigonal bipyramidal and cylindrical cages. Precise regulation of cylindrical cage geometry is achieved by replacing TPT with 1,3,5-trimethyl-2,4,6-tris (4-pyridyl)benzene (MTPB), yielding JXNU-22(Me). The isostructural JXNU-22 and JXNU-22(Me) have comparable C<sub>3</sub>F<sub>6</sub> uptakes of 140.8 and 138.3 cm<sup>3</sup> g<sup>−1</sup> (298 K and 1 bar), exceeding any reported porous materials. The presence of methyl groups enables the rotation of the peripheral pyridyl rings of MTPB ligands to generate the contracted cylindrical cages, which exhibit size exclusion towards C<sub>3</sub>F<sub>8</sub>, resulting in markedly enhanced C<sub>3</sub>F<sub>6</sub>/C<sub>3</sub>F<sub>8</sub> selectivity for JXNU-22(Me). Breakthrough experiments demonstrate high-purity C<sub>3</sub>F<sub>8</sub> (99.999%) with an exceptional productivity of 321.7 L kg<sup>−1</sup> can be harvested from C<sub>3</sub>F<sub>6</sub>/C<sub>3</sub>F<sub>8</sub> mixtures using JXNU-22(Me). Computational results reveal that the optimal cages decorated with abundant hydrogen atoms and aromatic moieties are responsible for the high-efficiency C<sub>3</sub>F<sub>6</sub> adsorption for MOFs. This work not only sets a new record for C<sub>3</sub>F<sub>6</sub> uptake in porous materials but also establishes a cage engineering approach to strategically tailoring pore structures of MOFs.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Achieving efficient perfluorinated propylene/propane separation by pore cage engineering in metal-organic frameworks

  • 期刊论文

  • 发表日期：

    2026年3月4日

查看全文
  • Hui-Fang Ma,
  • Xing-Ping Fu,
  • Hui-Ping Xiao,
  • Ling Chen,
  • Qing-Yan Liu,
  • Yu-Ling Wang

摘要

Separating perfluoropropane (C3F8) electronic specialty gas from C3F6/C3F8 mixtures is a challenging issue because of their similar physical properties and the stringent industrial purity standards for C3F8. We present a cage-based metal-organic framework (MOF) (JXNU-22) constructed from [Fe2Co(μ3-O)] clusters bridged by 4-(1H-tetrazol-5-yl)benzoic and 2,4,6-tri(4-pyridyl)-1,3,5-triazine (TPT) linkers, which features trigonal bipyramidal and cylindrical cages. Precise regulation of cylindrical cage geometry is achieved by replacing TPT with 1,3,5-trimethyl-2,4,6-tris (4-pyridyl)benzene (MTPB), yielding JXNU-22(Me). The isostructural JXNU-22 and JXNU-22(Me) have comparable C3F6 uptakes of 140.8 and 138.3 cm3 g−1 (298 K and 1 bar), exceeding any reported porous materials. The presence of methyl groups enables the rotation of the peripheral pyridyl rings of MTPB ligands to generate the contracted cylindrical cages, which exhibit size exclusion towards C3F8, resulting in markedly enhanced C3F6/C3F8 selectivity for JXNU-22(Me). Breakthrough experiments demonstrate high-purity C3F8 (99.999%) with an exceptional productivity of 321.7 L kg−1 can be harvested from C3F6/C3F8 mixtures using JXNU-22(Me). Computational results reveal that the optimal cages decorated with abundant hydrogen atoms and aromatic moieties are responsible for the high-efficiency C3F6 adsorption for MOFs. This work not only sets a new record for C3F6 uptake in porous materials but also establishes a cage engineering approach to strategically tailoring pore structures of MOFs.