期刊
SCIENCE ADVANCES
卷 1, 期 11, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1500421
关键词
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资金
- Indian Institute of Science Education and Research (Pune)
- Ministry of Human Resources and Development
- Natural Sciences and Engineering Research Council of Canada
- Science and Engineering Research Board-Confederation of Indian Industry-Department of Science and Technology
- Enovex
Metal organic frameworks (MOFs) built from a single small ligand typically have high stability, are rigid, and have syntheses that are often simple and easily scalable. However, they are normally ultra-microporous and do not have large surface areas amenable to gas separation applications. We report an ultra-microporous (3.5 and 4.8 angstrom pores) Ni-(4-pyridylcarboxylate)(2) with a cubic framework that exhibits exceptionally high CO2/H-2 selectivities (285 for 20:80 and 230 for 40:60 mixtures at 10 bar, 40 degrees C) and working capacities (3.95 mmol/g), making it suitable for hydrogen purification under typical precombustion CO2 capture conditions (1- to 10-bar pressure swing). It exhibits facile CO2 adsorption-desorption cycling and has CO2 self-diffusivities of similar to 3 x 10(-9) m(2)/s, which is two orders higher than that of zeolite 13X and comparable to other top-performing MOFs for this application. Simulations reveal a high density of binding sites that allow for favorable CO2-CO2 interactions and large cooperative binding energies. Ultra-micropores generated by a small ligand ensures hydrolytic, hydrostatic stabilities, shelf life, and stability toward humid gas streams.
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