Efficient Trapping of Trace Acetylene from Ethylene in an Ultramicroporous Metal-Organic Framework: Synergistic Effect of High-Density Open Metal and Electronegative Sites

Angewandte Chemie
Zhaoqiang ZhangDan Zhao

Abstract

Acetylene (C2 H2 ) removal from ethylene (C2 H4 ) is a crucial step in the production of polymer-grade C2 H4 but remains a daunting challenge because of the similar physicochemical properties of C2 H2 and C2 H4 . Currently energy-intensive cryogenic distillation processes are used to separate the two gases industrially. A robust ultramicroporous metal-organic framework (MOF), Ni3 (pzdc)2 (7 Hade)2 , is reported for efficient C2 H2 /C2 H4 separation. The MOF comprises hydrogen-bonded linked one-dimensional (1D) chains, and features high-density open metal sites (2.7 nm-3 ) and electronegative oxygen and nitrogen sites arranged on the pore surface as cooperative binding sites. Theoretical calculations, in situ powder X-ray diffraction and Fourier-transform infrared spectroscopy revealed a synergistic adsorption mechanism. The MOF possesses S-shaped 1D pore channels that efficiently trap trace C2 H2 at 0.01 bar with a high C2 H2 uptake of 60.6 cm3  cm-3 and C2 H2 /C2 H4 selectivity.

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Citations

Dec 29, 2020·Angewandte Chemie·Shanshan LiuLandong Li
Jan 14, 2021·Journal of the American Chemical Society·Baoyong ZhuKai-Jie Chen
May 7, 2021·ACS Applied Materials & Interfaces·Xin ZhangBanglin Chen
Apr 11, 2021·Chemistry : a European Journal·Xue JiangKai-Jie Chen
May 27, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Qianqian YangJianzhuang Jiang
Jun 12, 2021·Journal of the American Chemical Society·Fuqiang ChenZongbi Bao
Sep 1, 2021·Journal of the American Chemical Society·Wei GongBanglin Chen

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