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MOFs in carbon capture-past, present and future
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2020-08-28 , DOI: 10.1016/j.jcou.2020.101297
R. Aniruddha , I. Sreedhar , Benjaram M. Reddy

Metal Organic Frame works (MOFs) are being widely used in carbon capture through adsorption and membrane techniques, which are yet to be commercialized. This is due to their high affinity towards acidic gases and exceptional characteristics such as crystallinity, structural stability, high surface area and flexible pore dimensions. In this review, wide range of topics viz., synthesis protocols, modifications employed to further improve their attributes, comprehensive comparison of different MOFs used in carbon capture, thermo-kinetics modelling studies, contactors and material screening. Every section has been discussed in detail in terms of developmental trends, future challenges and prospects besides summarizing in the form of comprehensive tables at a glance for the benefit of the readers. Solvo-thermal method was found to be the most effective synthesis method besides ultra-sonication and microwave assisted methods, which also gave very good crystalline structures. The copper ligand based unmodified Cu-BTC MOF gave the maximum CO2 uptake value of 9.59 mmol/g at 273 K and 1 atm. Zn(Bmic)(AT) MOF was the only species to be tested at 353 K. Alternatively, a photo-responsive MOF, Mg-IRMOF-74-III functionalized with azopyridine gave a CO2 uptake of 89 cc/g which is comparable to many of the conventional MOFs. Kinetics indicate MOF adsorption mostly follows pseudo second order reactions either along with Toth isotherms or modified Langmuir isotherms. Fixed and fluidized bed reactors perform the best in terms of carbon capture studies. Moisture affinity, active sites and crystallinity were found to be the best factors considered whilst screening of proper MOFs.



中文翻译:

过去和现在碳捕获中的MOF

金属有机框架作品(MOF)已广泛用于通过吸附和膜技术进行碳捕集,但尚未商业化。这是由于它们对酸性气体的高度亲和力以及出色的特性,例如结晶度,结构稳定性,高表面积和灵活的孔尺寸。在这篇综述中,主题广泛,包括合成方案,用于进一步改善其属性的修饰,用于碳捕获,热动力学建模研究,接触器和材料筛选的不同MOF的综合比较。除了以综合表格的形式汇总以使读者受益一目了然之外,每个部分都针对发展趋势,未来挑战和前景进行了详细讨论。发现溶剂热法是除超声波和微波辅助方法外最有效的合成方法,它们也具有很好的晶体结构。铜配体基未改性的Cu-BTC MOF产生最大的CO2在273 K和1 atm时的吸收值为9.59 mmol / g。Zn(Bmic)(AT)MOF是在353 K下进行测试的唯一物质。或者,用偶氮吡啶官能化的光敏MOF Mg-IRMOF-74-III的CO 2吸收量为89 cc / g,这是可比的许多传统的MOF。动力学表明,MOF吸附主要跟随拟二阶反应以及Toth等温线或修饰的Langmuir等温线。固定床和流化床反应器在碳捕获研究方面表现最佳。发现水分亲和力,活性位点和结晶度是筛选合适的MOF时考虑的最佳因素。

更新日期:2020-08-28
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