Two Trinuclear-Cluster-Based MOFs with High-Density N Sites for One-Step Natural Gas Purification and MTO Product Separation

Metal-organic frameworks exhibit high adsorption and separation capabilities in the one-step separation of natural gas mixtures and purifying MTO products. In this work, <b>JLU-MOF191</b> [Ni(II)<sub>2</sub>Ni(III)(OH)(PDDA)<sub>3</sub>]·5.5DMF·2H<sub>2</sub>O and <b>JLU-MOF192</b> [Co<sub>3</sub>(OH)(PDDA)<sub>3</sub>]·[(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]·4DMA·3H<sub>2</sub>O were successfully synthesized. <b>JLU-MOF192-Li</b> was obtained through <b>Li</b><sup>+</sup> exchange, which involved replacing (CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub><sup>+</sup> inside the anion framework of <b>JLU-MOF192</b> by Li<sup>+</sup>. Both MOFs possess permanent pores, excellent thermal stability, and notable high BET surface areas. The nitrogen-containing heterocyclic carboxylic acid ligand H<sub>2</sub>PDDA provides a large number of N-binding sites inside the channels, which increases the C-H···N interactions between the frameworks and the gases. <b>JLU-MOF191</b> and <b>JLU-MOF192-Li</b> exhibit high adsorption capacities and <i>Q</i><sub>st</sub> for C<sub>3</sub>H<sub>8</sub>, C<sub>3</sub>H<sub>6,</sub> and C<sub>2</sub>H<sub>6</sub>, which endow them with the ability to purify natural gas and MTO products. By changing the metal nodes, <b>JLU-MOF192-Li</b> exhibits higher adsorption and separation capabilities than <b>JLU-MOF191</b>. The DFT theoretical calculation confirmed that <b>JLU-MOF192-Li</b> exhibits a higher adsorption for C<sub>3</sub>H<sub>8</sub>, C<sub>3</sub>H<sub>6,</sub> and C<sub>2</sub>H<sub>6</sub> compared to C<sub>2</sub>H<sub>4</sub> and CH<sub>4</sub>. The column penetration experiment demonstrated that <b>JLU-MOF192-Li</b> could respectively obtain methane (purity: 99.9%) and C<sub>2</sub>H<sub>4</sub> (purity: 99.9%) from the two mixtures of C<sub>3</sub>H<sub>8</sub>/C<sub>2</sub>H<sub>6</sub>/CH<sub>4</sub> and C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub>. The excellent adsorption and separation performances of <b>JLU-MOF192-Li</b> for natural gas and MTO products make it a potential material for industrial applications.

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Journal
Inorganic Chemistry
Published
2026-03-13
DOI
https://doi.org/10.1021/acs.inorgchem.6c00268
Primary Topic
Metal-Organic Frameworks: Synthesis and Applications
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article
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article

Two Trinuclear-Cluster-Based MOFs with High-Density N Sites for One-Step Natural Gas Purification and MTO Product Separation

Xinqi Liu, Borong Zhang, Yunling Liu, Qi Li et al.
Inorganic Chemistry
Metal-Organic Frameworks: Synthesis and Applications
article

Two Trinuclear-Cluster-Based MOFs with High-Density N Sites for One-Step Natural Gas Purification and MTO Product Separation

Xinqi Liu, Borong Zhang, Yunling Liu, Qi Li, Sijia Li, Xiaolong Luo, Xiaolin Wu, Zizhan Wan, Zhaohui Shi, Xinyao Liu, Lirong Zhang
article en

Abstract

Metal-organic frameworks exhibit high adsorption and separation capabilities in the one-step separation of natural gas mixtures and purifying MTO products. In this work, <b>JLU-MOF191</b> [Ni(II)<sub>2</sub>Ni(III)(OH)(PDDA)<sub>3</sub>]·5.5DMF·2H<sub>2</sub>O and <b>JLU-MOF192</b> [Co<sub>3</sub>(OH)(PDDA)<sub>3</sub>]·[(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]·4DMA·3H<sub>2</sub>O were successfully synthesized. <b>JLU-MOF192-Li</b> was obtained through <b>Li</b><sup>+</sup> exchange, which involved replacing (CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub><sup>+</sup> inside the anion framework of <b>JLU-MOF192</b> by Li<sup>+</sup>. Both MOFs possess permanent pores, excellent thermal stability, and notable high BET surface areas. The nitrogen-containing heterocyclic carboxylic acid ligand H<sub>2</sub>PDDA provides a large number of N-binding sites inside the channels, which increases the C-H···N interactions between the frameworks and the gases. <b>JLU-MOF191</b> and <b>JLU-MOF192-Li</b> exhibit high adsorption capacities and <i>Q</i><sub>st</sub> for C<sub>3</sub>H<sub>8</sub>, C<sub>3</sub>H<sub>6,</sub> and C<sub>2</sub>H<sub>6</sub>, which endow them with the ability to purify natural gas and MTO products. By changing the metal nodes, <b>JLU-MOF192-Li</b> exhibits higher adsorption and separation capabilities than <b>JLU-MOF191</b>. The DFT theoretical calculation confirmed that <b>JLU-MOF192-Li</b> exhibits a higher adsorption for C<sub>3</sub>H<sub>8</sub>, C<sub>3</sub>H<sub>6,</sub> and C<sub>2</sub>H<sub>6</sub> compared to C<sub>2</sub>H<sub>4</sub> and CH<sub>4</sub>. The column penetration experiment demonstrated that <b>JLU-MOF192-Li</b> could respectively obtain methane (purity: 99.9%) and C<sub>2</sub>H<sub>4</sub> (purity: 99.9%) from the two mixtures of C<sub>3</sub>H<sub>8</sub>/C<sub>2</sub>H<sub>6</sub>/CH<sub>4</sub> and C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub>. The excellent adsorption and separation performances of <b>JLU-MOF192-Li</b> for natural gas and MTO products make it a potential material for industrial applications.

Inorganic Chemistry
Jilin University (CN), Sinochem Group (China) (CN), Jilin Medical University (CN), Advanced Life Science Institute (JP), Changchun University of Technology (CN), State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
Openalex Percentile: Top 25%
Metal-Organic Frameworks: Synthesis and Applications
DOISourceOpenAlex
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