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Adaptive Corner-Pocket Channels in a Metal-Organic Framework for Acetylene Ultra-Fast Diffusion and Storage.

Yuejiang Han¹, Chunqing Ji², Mingyao He¹

¹College of Chemistry, Liaoning University, Shenyang, P. R. China.

Angewandte Chemie (International Ed. in English)

|March 26, 2026

Summary

A novel manganese-based metal-organic framework (MOF), Mn-dcbp, achieves high acetylene uptake and ultrafast diffusion for efficient gas separation. This material demonstrates excellent stability and large-scale production potential for industrial applications.

Keywords:

adsorption separation channel design high‐temperature storage record‐high storage density ultrafast kinetic

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Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Ultra-microporous molecular sieving materials are crucial for gas separation but face limitations in diffusion kinetics and adsorption capacity.
Manganese-based metal-organic frameworks (MOFs) offer potential for advanced gas separation applications.

Purpose of the Study:

To develop a cost-effective manganese-based MOF (Mn-dcbp) with enhanced acetylene (C2H2) uptake and ultrafast diffusion kinetics.
To investigate the structural adaptation mechanism of Mn-dcbp for improved gas storage density and separation performance.
To evaluate the stability and large-scale production feasibility of Mn-dcbp for industrial implementation.

Main Methods:

Synthesis of a manganese-based metal-organic framework (Mn-dcbp) with a unique "corner-pocket" channel structure.
In situ single-crystal X-ray diffraction to elucidate the host-guest interaction and structural adaptation mechanism.
Gas adsorption and separation experiments to quantify acetylene uptake, diffusion kinetics, and selectivity for C2H2/C2H4 and C2H2/CO2 mixtures.

Main Results:

Mn-dcbp exhibits high acetylene uptake (126.3 cm3/cm3) and ultrafast diffusion kinetics (k = 0.01863 s-1) while maintaining C2H2/C2H4 sieving selectivity.
A sub-angstrom-level structural adaptation mechanism induced by acetylene leads to a record storage density of 1.02 g/mL.
Excellent C2H2 adsorption capacity (110.6 cm3/cm3) is maintained at elevated temperatures (75 °C), with superior separation performance for C2H2/C2H4 and C2H2/CO2 gas mixtures.

Conclusions:

Mn-dcbp presents a promising solution to the limitations of conventional molecular sieving materials, offering high capacity and fast kinetics.
The adaptive channel structure and strong host-guest interactions enable efficient acetylene storage and separation.
The material's large-scale, environmentally friendly production, coupled with excellent stability, highlights its potential for industrial gas separation applications.