Effect of Fe open metal site in metal‐organic frameworks on post‐combustion CO 2 capture performance

Suwimol Wongsakulphasatch, Worapon Kiatkittipong, Janenipa Saupsor, Jatuphol Chaiwiseshphol, Pakorn Piroonlerkgul, Vudhichai Parasuk and Suttichai Assabumrungrat

Greenhouse Gases: Science and Technology, 2017, vol. 7, issue 2, 383-394

Abstract: Iron open metal site in metal‐organic frameworks, MIL‐88A and MIL‐127(Fe), was tested to investigate its performance on CO 2 separation from a binary mixture CO 2 /N 2 under simulated post‐combustion system. The sorption experiment tests were conducted via a fixed‐bed reactor with different temperatures ranging between 30°C and 60°C at atmospheric pressure. Maximum CO 2 sorption capacity was observed at low temperature of 30°C, where 5.24 mmol could be adsorbed by one gram of MIL‐127(Fe) and 4.95 mmol CO 2 could be adsorbed by one gram of MIL‐88A. The presence of moisture in the gas mixture affected CO 2 sorption capacity by reducing CO 2 capacity as high as 0.5 mmol CO 2 per one gram sorbent. In this work, a dynamic breakthrough model was applied to investigate adsorption behavior of the metal‐organic frameworks (MOFs) and of the system. The predicted model showed good agreement with experimental results; the Langmuir isotherm model fitted well with our sorption system, suggesting one molecule of CO 2 is held at localized sites of the MOFs, which plausibly be at unsaturated Fe-super-2+ metal ion site. Rate of sorption was found to increase with increasing sorption temperature for either intra‐particle diffusivity or external mass transfer. Our study suggests that the MOFs containing Fe open metal sites offer an outstanding prospective for CO 2 sorption and both MIL‐88A and MIL‐127(Fe) are good representatives applied for post‐combustion CO 2 capture. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:7:y:2017:i:2:p:383-394

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