کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
72032 | 49009 | 2016 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Oxygen selective iron and cobalt–metalloporphyrin polymers – Extraordinary selectivity at low temperature Oxygen selective iron and cobalt–metalloporphyrin polymers – Extraordinary selectivity at low temperature](/preview/png/72032.png)
• Polymers made up of porphyrin ring building blocks with coordinated Fe and Co ions were synthesized.
• The Co-POP was shown to be oxygen selective at 273.15 K (selectivity of up to 1.3).
• Both Fe-POP and Co-POP were oxygen selective at 91.35 K (selectivity of up to 14.7).
• Nitrogen gas excluded from the pores below a critical temperature.
• Repeated gas sorption measurements at 273.15 K showed no drop in adsorption capacity.
Oxygen binding properties of a recent class of porphyrin-based porous organic polymers (POPs) were investigated. POPs containing iron (Fe-POP) and cobalt (Co-POP) were synthesized, characterized and evaluated. Adsorption studies under ambient and cryogenic conditions (91–303 K) were studied. Interestingly, these POPs showed selective adsorption of O2 over N2 of up to 1.3 at 273 K, and most significantly, the oxygen uptake was found to be stable and reversible over the range of temperatures studied. Furthermore, the polymers also exhibited a molecular sieving effect, which showed increasing nitrogen exclusion between 110 K and 160 K and led to an extraordinary O2:N2 selectivity of up to 14.7 at 91 K. The high oxygen loading (13 wt% at 1 atm) together with the high selectivity suggests great potential for use of these materials in hybrid adsorption–cryogenic air separation systems.
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Journal: Microporous and Mesoporous Materials - Volume 222, 1 March 2016, Pages 63–72