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Robust Nickel-Based Metal-Organic Framework for Highly Efficient Methane Purification and Capture.

Shi Tu¹, Liang Yu¹, Danxia Lin¹

¹School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, P. R. China.

ACS Applied Materials & Interfaces

|January 11, 2022

Summary

A novel nickel-based metal-organic framework, Ni-BPZ, efficiently purifies methane (CH4) from natural gas and captures it from coal-mine gas. This material demonstrates superior selectivity and uptake for C2H6/CH4 and CH4/N2 separations.

Keywords:

adsorption separation coal-mine methane metal−organic frameworks methane purification natural gas

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Methane (CH4) purification and capture are critical for the chemical industry.
Energy-efficient alternatives are needed for natural gas processing and coal-mine gas management.

Purpose of the Study:

To develop a novel metal-organic framework (MOF) for efficient separation of gas mixtures.
To investigate the performance of the MOF for ethane/methane and methane/nitrogen separations.

Main Methods:

Synthesis of a robust nickel-based MOF, Ni-BPZ, with 1D rhombic channels.
Experimental evaluation of Ni-BPZ for C2H6/CH4 and CH4/N2 binary mixture separations.
Molecular simulations to understand the adsorption mechanism.

Main Results:

Ni-BPZ achieved a high C2H6/CH4 selectivity of 50.2 with a C2H6 uptake of 2.46 mmol/g.
Ni-BPZ demonstrated a CH4/N2 selectivity of 6.6 with a CH4 uptake of 1.56 mmol/g.
Molecular simulations confirmed the role of 1D channels and pyrazole rings in adsorption.

Conclusions:

Ni-BPZ is a highly effective adsorbent for energy-efficient methane purification and capture.
The unique structure of Ni-BPZ facilitates superior gas separation performance.
This MOF offers a promising solution for industrial gas separation challenges.