Robust Ultramicroporous Metal–Organic Frameworks with Benchmark Affinity for Acetylene

Document Type

Article

Publication Date

2018

Keywords

acetylene, gas separation, hydrolytic stability, metal–organic frameworks, ultramicroporous materials

Digital Object Identifier (DOI)

https://doi.org/10.1002/anie.201806732

Abstract

Highly selective separation and/or purification of acetylene from various gas mixtures is a relevant and difficult challenge that currently requires costly and energy-intensive chemisorption processes. Two ultramicroporous metal–organic framework physisorbents, NKMOF-1-M (M=Cu or Ni), offer high hydrolytic stability and benchmark selectivity towards acetylene versus several gases at ambient temperature. The performance of NKMOF-1-M is attributed to their exceptional acetylene binding affinity as revealed by modelling and several experimental studies: in situ single-crystal X-ray diffraction, FTIR, and gas mixture breakthrough tests. NKMOF-1-M exhibit better low-pressure uptake than existing physisorbents and possesses the highest selectivities yet reported for C2H2/CO2 and C2H2/CH4. The performance of NKMOF-1-M is not driven by the same mechanism as current benchmark physisorbents that rely on pore walls lined by inorganic anions.

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Citation / Publisher Attribution

Angewandte Chemie International Edition, v. 57, issue 34, p. 10971-10975

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