利用三种不同长度的有机配体--反丁烯二酸(H2FUM)、对苯二甲酸(H2BDC)和联苯二甲酸(H2BPDC),合成了一系列具有不同孔尺寸的新型铪(Hf)金属-有机骨架(MOF)材料(Hf-FUM、Hf-BDC 和 Hf-BPDC),并考察了 CO2、N2和 CH4三种气体在这些材料中吸附分离行为。研究结果表明,这三种材料具有和 UiO-66(Zr)相同的拓扑结构,且具有很好的热稳定性。Hf-FUM和Hf-BDC的结构在水中能够保持稳定,而Hf-BPDC在水中会发生降解。同时,具有最小孔尺寸的Hf-FUM材料对CO2/N2以及CO2/CH4体系具有最好的分离性能。这为以后设计用于CO2分离的新型纳微结构材料提供了参考依据。separation of CO2/N2and CO2/CH4 systems were also investigated. It is found that Hf-FUM with the smallest pore size possesses the highest adsorption selectivity for CO2 over N2and CH4. This is the first study on the performance of Hf-based MOFs for gas separation, and the knowledge obtained in this work provides a foundation for the design of new nanoporous materials towards CO2 capture from various gas mixtures.
金属-有机骨架材料、铪、孔尺寸调控、稳定性、吸附、二氧化碳捕集
TQ028.1(一般性问题)
国家重点基础研究发展计划项目2013CB733503;国家自然科学基金项目21136001,21322603;教育部新世纪优秀人才项目NCET-12-0755。@@@@supported by the National Basic Research Program of China2013CB733503;the National Natural Science Foundation of China21136001,21322603;the Program for New Century Excellent Talents in UniversityNCET-12-0755