Details

Autor(en) / Beteiligte

• Wang, Gang-Ding
• Wang, Hai-Hua
• Shi, Wen-Juan
• Hou, Lei
• Wang, Yao-Yu
• Zhu, Zhonghua

Titel

A highly stable MOF with F and N accessible sites for efficient capture and separation of acetylene from ternary mixtures

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2021-11, Vol.9 (43), p.24495-2452

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Considering the important applications and purification requirement of C 2 hydrocarbons in the industry, the separation of C 2 in mixtures is a vital task. To achieve this goal, herein a new Ni 2+ -based metal-organic framework (MOF) has been solvothermally prepared by utilizing a tetrazolyl-carboxyl ligand and 4,4′-bipyridine coligands as well as incorporating F − ions. The MOF shows a unique pillared-layer framework based on the novel metal-tetrazolate-carboxylate-fluorine chains, and possesses high chemical stability. Owing to the exposed adsorption sites of uncoordinated N atoms and F − ions in the channels, the MOF had high loadings for C 2 H 2 and selectivity for C 2 H 2 over C 2 H 4 , C 2 H 6 , CO 2 and CH 4 . Under ambient conditions, dynamic breakthrough experiments revealed that the MOF performs effective separation of C 2 H 2 from binary (C 2 H 2 -CH 4 , C 2 H 2 -C 2 H 6 , C 2 H 2 -C 2 H 4 , and C 2 H 2 -CO 2 ) and ternary (C 2 H 2 -CO 2 -CH 4 , C 2 H 2 -C 2 H 6 -CH 4 , C 2 H 2 -C 2 H 4 -CH 4 , and C 2 H 2 -C 2 H 4 -C 2 H 6 ) mixtures. The comparison based on the GCMC calculation revealed the crucial role of the accessible N and F sites for the selective capture of C 2 H 2 . A stable Ni-MOF with high adsorption selectivity for C 2 H 2 was constructed by the strategy of incorporating active N and F sites in the porous surface, showing the dynamic separation of C 2 H 2 from binary and ternary mixtures in one-step.