摘要
SF6/N2混合物的高效分离,对SF6气体的回收与减弱其直接排放所导致的温室效应,具有重要的实际意义。合成了一种具有不同性质孔道结构的金属-有机骨架材料,Cu-MOF-OMe。该材料具有含不饱和配位金属位点和甲氧基双功能化的特征,且表现出良好的水热稳定性和再生性能。该材料表现出优异的综合分离性能,298 K和105 Pa下的分离选择性(361)和吸附剂选择性参数(SSP)值(780)均远高于文献报道值。理论计算发现,亲水性孔道中的不饱和金属位和疏水性孔道中丰富的甲氧基的协同作用,为该MOF材料具有优异SF6/N2分离性能的主要原因。研究结果可为SF6/N2高效分离材料的设计与开发提供参考依据。
The efficient separation of the SF6/N2 mixture has important practical significance for the recovery of SF6 gas and the reduction of the greenhouse effect caused by its direct discharge.In this work,a metal–organic framework(Cu-MOF-OMe)was prepared with two different types and properties of pores.It possesses duallyfunctionalized characteristics of coordinatively unsaturated metal sites and methoxy groups,which exhibit good hydrothermal stability and adsorptive regenerability.This material also shows excellent separation performance for SF6/N2 mixture.At 298 K and 105 Pa,the observed adsorption selectivity(361)and sorbent selection parameter(SSP)value(780)are highest compared to various porous materials reported so far.Theoretical calculation results indicated that the underlying reason of such excellent separation properties is attributed to the cooperative effects of the open Cu sites in the hydrophilic pores and the abundant methoxy groups in the hydrophobic pores.The findings may provide valuable foundation for developing highly efficient materials for practical of SF6/N2 separation.
作者
常苗
刘磊
阳庆元
刘大欢
仲崇立
CHANG Miao;LIU Lei;YANG Qingyuan;LIU Dahuan;ZHONG Chongli(State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China;State Key Laboratory of Separation Membranes and Membrane Processes,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第1期320-328,共9页
CIESC Journal
基金
国家自然科学基金项目(21536001,21722602,21576009)
关键词
金属-有机骨架材料
不饱和金属位点
六氟化硫
氮气
分离
metal-organic frameworks
unsaturated metal sites
sulfur hexafluoride
nitrogen
separation
