传统吸附材料如胺基液体吸收剂、沸石、活性炭等,普遍存在吸附量低、选择性差、再生能耗高及成本昂贵等问题,金属-有机框架材料MOF-74因独特的不饱和金属位点与优异的低压CO2吸附性能而备受关注,Mg-MOF-74的CO2吸附性能更是在MOF-74中脱颖而出,被认为是新一代CO2捕集的理想候选材料。但Mg-MOF-74在潮湿条件下吸附性能的降低,使得Mg-MOF-74的实际应用受到严峻挑战。介绍了Mg-MOF-74的框架结构、合成方法及其CO2吸附机理,探讨了Mg-MOF-74在潮湿条件下吸附性能下降的成因与解决策略,综述了提高Mg-MOF-74稳定性的改性方法,以期为高性能碳捕集材料的设计与工业化开发提供参考。
Traditional adsorption materials such as amine-based liquid absorbents,zeolites,and activated carbons generally face problems including low adsorption capacity,poor selectivity,high regeneration energy consumption,and high cost.Metal-organic framework material MOF-74 has attracted much attention due to its unique unsaturated metal sites and excellent low-pressure CO2 adsorption performance.Among the MOF-74 series,Mg-MOF-74 stands out for its CO2 adsorption performance and is considered an ideal candidate material for a new generation of CO2 capture.However,the decline in the adsorption performance of Mg-MOF-74 under wet conditions poses a serious challenge to its practical application.In this paper,the framework structure,synthesis methods and CO2 adsorption mechanism of Mg-MOF-74 were systematically introduced.The causes and solutions of the decrease of adsorption performance of Mg-MOF-74 under wet conditions were discussed.The modification methods to improve the stability of Mg-MOF-74 were reviewed in order to provide references for the design and industrial development of high-performance carbon capture materials.
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基金资助
辽宁省教育厅重点攻关项目(JYTZD2023111,LZGD2019004);辽宁百千万人才项目;辽宁省科技厅自然科学基金资助项目(20170540685,2014020117)
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